阅读说明：本技术 双旋筒双柱塞滑键式轴塞芯三位一体防喷器 (Double-rotary-barrel double-plunger sliding key type shaft-plug core three-in-one blowout preventer ) 是由 刘新福 刘春花 郝爱刚 杨洪英 王建峰 王增章 何鸿铭 张瑞强 王筱磊 于 2020-04-15 设计创作，主要内容包括：本发明提供了一种双旋筒双柱塞滑键式轴塞芯三位一体防喷器,应用于油气开采修井防喷作业。壳体总成的上塞芯圆滑道和下塞芯圆滑道分别与上光杆防喷机构和下抽油杆防喷机构相配合,旋筒轴座采用侧门式旋转动筒,且依据螺旋传动副和双柱面转动副实施螺旋传动并将旋筒体的旋转运动转化为传动轴的轴向移动,上轴塞芯总成和下轴塞芯总成均采用圆柱状活塞式和轴塞芯三位一体构造并作为防喷器的密封总成和传动总成,两套上轴塞芯总成和下轴塞芯总成依据双平面移动副和双活塞移动副进行精准滑移并通过滑键限位器完成轴向和周向限位,而后分别卡住通径杆穿孔内的光杆和抽油杆,由此实现封闭式密封胶芯和三○形密封圈组合式的非金属密封及井口防喷作业。(The invention provides a double-rotary-cylinder double-plunger sliding key type shaft-plug-core three-in-one blowout preventer, which is applied to blowout prevention operation of oil and gas exploitation well workover.A circular slide way of an upper plug-core and a smooth way of a lower plug-core of a shell assembly are respectively matched with an upper sucker rod blowout prevention mechanism and a lower sucker rod blowout prevention mechanism, a rotary-cylinder shaft seat adopts a side-door type rotary movable cylinder, and performs spiral transmission according to a spiral transmission pair and a double-cylindrical surface rotating pair and converts the rotary motion of a rotary cylinder into axial movement of a transmission shaft, the upper plug-core assembly and the lower plug-core assembly both adopt a cylindrical piston type and shaft-plug-core three-in-one structure and serve as a sealing assembly and a transmission assembly of the blowout preventer, the two sets of upper plug-core assemblies and the lower plug-core assemblies perform accurate sliding according to a double-plane moving pair and a double-piston moving pair and complete axial and circumferential limiting through a sliding key stopper, and then respectively clamp a polish rod and a sucker rod in a through-diameter.)

1. The utility model provides a two plunger sliding key formula axle stopper core trinity preventer of bispin section of thick bamboo, the last stopper core rounding off of casing assembly disposes two upper axle stopper core assemblies and two sliding key stopper in proper order and its both sides end is equipped with two rotary cylinder axle beds and constitutes independent upper polish rod blowout prevention mechanism, the blowout of polished rod when control workover, lower stopper core rounding off disposes two lower axle stopper core assemblies and two sliding key stopper in proper order and its both sides end is equipped with two rotary cylinder axle beds and constitutes independent lower sucker rod blowout prevention mechanism, the blowout of sucker rod when control workover, its characterized in that:

a housing assembly; the shell assembly adopts a double-cross-shaped-hole shell, an upper box joint, a three-hole shell and a lower through joint are sequentially arranged along the axial direction of a polished rod, and an upper plug core circular slide way and a lower plug core smooth way of the three-hole shell are respectively matched with an upper sucker rod blowout prevention mechanism and a lower sucker rod blowout prevention mechanism; the upper box joint and the lower through joint respectively adopt a female buckle round pipe body and a male buckle round pipe body, and sequentially connect a wellhead sealing box, a three-hole shell and a wellhead tee into a whole, the three-hole shell adopts a flat square-cylindrical shell and is sequentially provided with a drift diameter rod perforation, an upper plug core round slideway and a lower plug core round slideway, the upper plug core round slideway and the lower plug core round slideway are simultaneously and vertically crossed with the drift diameter rod perforation, and the upper plug core round slideway and the lower plug core round slideway are formed by combining a sliding round hole channel and two limiting round hole channels;

the upper shaft plug core assembly and the lower shaft plug core assembly respectively clamp a polish rod and a sucker rod and realize the combined non-metal sealing of a sealed rubber core and three ○ -shaped sealing rings, each upper shaft plug core assembly and each lower shaft plug core assembly respectively comprise a transmission shaft, a sliding plunger, a sealed rubber core and three ○ -shaped sealing rings, the transmission shaft, the sliding plunger and the sealed rubber core adopt a shaft plug core trinity, the transmission shaft and the sliding plunger are integrally processed by cylindrical alloy steel, the sliding plunger and the sealed rubber core adopt a vulcanization integral processing technology, the transmission shaft adopts a cylindrical slender rod, a guide sliding key groove and a guide sliding key form a double-plane moving pair, the sliding plungers of the two upper shaft plug core assemblies respectively form a double-piston moving pair with the smooth channel of the upper plug core, the sliding plungers of the two lower shaft plug core assemblies respectively form a double-piston moving pair with the smooth channel of the lower plug core, the sliding plunger adopts a cylindrical piston, the ring surface of the polish rod is sequentially provided with a shell sealing ring groove and a sealing ring groove from inside to outside, the sealing surface of the rectangular plug core assembly is provided with a sealing groove, the sealing groove of the sealed plunger, the sealing surface of the sealed plunger and the sealing groove of the sealed rubber core, the sealed plunger, the sealing surface of the rectangular plunger is provided with the sealing groove of the sealed plunger, the sealing groove of the sealed plunger and the sealing groove of the sealed plunger, the rectangular plunger, the sealing surface of the rectangular plunger, the sealing groove of the rectangular plunger, the sealing surface of the sealing groove of the rectangular plunger, the rectangular plunger is provided with the sealing groove of the rectangular plunger, the sealing ring groove;

a sliding key stopper; the sliding key limiter realizes the accurate sliding of the upper shaft plug core assembly and the lower shaft plug core assembly according to the double-plane sliding pair and the double-piston sliding pair and comprises a limiting body and a guide sliding key; the guide sliding key is a common guide flat key, the limiting body is a thick-wall cylinder, and the inner side end face of the limiting body along the radial direction of the polish rod is matched with the outer side end face of the sliding plunger and realizes axial limiting in the opening process of the upper shaft plug core assembly and the lower shaft plug core assembly; the wall of the limiting body is milled with a guide limiting key groove, a sliding key dismounting round hole is drilled on the groove top surface of the guide limiting key groove, the groove walls on the two sides of the guide limiting key groove and the two side surfaces of the guide sliding key are in interference fit, and the groove top surface of the guide limiting key groove and the key top surface of the guide sliding key are in clearance fit, so that the guide sliding key and the limiting body are fixed, and the upper shaft plug core assembly and the lower shaft plug core assembly are circumferentially limited;

a rotary cylinder shaft seat; the rotary cylinder shaft seat adopts a side door type rotary movable cylinder structure, performs spiral transmission according to a spiral transmission pair and a double-cylindrical surface rotating pair and converts the rotary motion of the rotary cylinder body into axial movement of a transmission shaft, and comprises a rotary cylinder body and a square flange; the inner side and the outer side of the rotary cylinder body along the radial direction of the polish rod are respectively provided with a columnar clamp and a hexagonal wrench square diameter, a double-cylindrical-surface rotating pair is formed between the rotary cylinder body and the rotary clamp ring simultaneously through the columnar clamp and a rotary cylinder clamping groove, and a spiral transmission pair is formed between a trapezoidal transmission internal thread of the rotary cylinder body and trapezoidal transmission external threads of transmission shafts of the upper shaft plug core assembly and the lower shaft plug core assembly; a limiting clamping groove, a rotary cylinder clamping groove and a rotary clamping ring are sequentially arranged on the inner wall of the annular cavity of the square flange along the radial direction of the polished rod, and the limiting clamping groove realizes axial fixation of the sliding key limiter.

2. The twin-rotor twin-ram sliding-key shaft-plug-core three-in-one blowout preventer according to claim 1, wherein: the double-rotary-cylinder double-plunger sliding-key type shaft plug core three-in-one blowout preventer is connected with a wellhead sealing box through an upper box joint of a shell assembly and is connected with a wellhead tee joint into a whole through a lower through joint of the shell assembly, the shell assembly adopts a single body, the upper shaft plug core assembly and the lower shaft plug core assembly adopt symmetrically arranged double bodies, and a sliding key limiter and a rotary-cylinder shaft seat adopt a four-body structure which is symmetrically arranged and arranged in layers.

3. The twin-rotor twin-ram sliding-key shaft-plug-core three-in-one blowout preventer according to claim 1, wherein: in the shaft-plug core trinity blowout prevention flow of the oil and gas exploitation well repair operation of the double-rotary-barrel double-plunger sliding key type shaft-plug core trinity blowout preventer, according to a screw transmission pair and a double-cylindrical surface revolute pair of the upper polish rod blowout prevention mechanism, screw transmission is implemented, the rotary motion of a rotary-barrel shaft seat is converted into axial movement of a transmission shaft, and by combining a double-plane moving pair and a double-piston moving pair of the upper polish rod blowout prevention mechanism, two sets of upper shaft-plug core assemblies respectively slide smoothly and accurately along an upper plug core channel of a shell assembly and clamp a polish rod and compress a closed sealing rubber core, so that nonmetal sealing and blowout prevention operation between the upper polish rod blowout prevention mechanism and the polish rod; according to the screw transmission pair and the double-cylindrical surface revolute pair of the lower sucker rod blowout preventing mechanism, screw transmission is implemented, the rotary motion of the rotary cylinder shaft seat is converted into axial movement of the transmission shaft, and by combining the double-plane moving pair and the double-piston moving pair of the lower sucker rod blowout preventing mechanism, two sets of lower shaft plug core assemblies respectively slide accurately along the lower plug core smooth channel of the shell assembly and clamp the sucker rod and compress the closed type sealing rubber core, so that nonmetal sealing and blowout preventing operation between the lower sucker rod blowout preventing mechanism and the sucker rod are realized.

4. The twin-rotor twin-ram sliding-key shaft-plug-core three-in-one blowout preventer according to claim 1, wherein: a polished rod and a sucker rod are arranged in a drift diameter rod through hole of the shell assembly, pipe cavities of the upper box joint and the lower drift diameter joint are communicated with the drift diameter rod through hole of the three-hole shell simultaneously, and the minimum diameter of an annular surface where the pipe cavities of the upper box joint and the lower drift diameter joint are located is equal to the aperture of the drift diameter rod through hole;

the pore path in the three-hole shell is in a double-cross shape, the through-diameter rod is perforated along the axial direction of the polished rod and adopts equal-diameter circular through holes, the upper plug core circular slideway and the lower plug core circular slideway are arranged in a layered mode, two limiting circular holes of the upper plug core circular slideway and the lower plug core circular slideway are symmetrically arranged at two side ends of the sliding circular pore path, two sets of upper plug core assemblies and two sets of lower plug core assemblies are respectively arranged in the sliding circular hole paths of the upper plug core circular slideway and the lower plug core circular slideway, sliding key limiters of the same model are arranged in the two limiting circular pore paths of the upper plug core circular slideway and the two limiting circular pore paths of the lower plug core circular slideway, and meanwhile, the two side end faces of the three-hole shell connect four sets of rotating cylinder shaft seats of the same model to two sides of the shell assembly.

5. The twin-rotor twin-ram sliding-key shaft-plug-core three-in-one blowout preventer according to claim 1, wherein: the upper shaft plug core assembly and the lower shaft plug core assembly are both of a cylindrical piston type and shaft plug core three-in-one structure, the transmission shaft is lathed with trapezoidal transmission external threads along the radial outer side of the polished rod, a guide sliding key groove is milled in the transmission shaft, the guide sliding key groove is arranged along the axial direction of the transmission shaft, the groove bottom surface of the guide sliding key groove is in clearance fit with the key bottom surface of the guide sliding key, and meanwhile, the groove walls on the two sides of the guide sliding key groove are respectively in precise fit with the two side surfaces of the guide sliding key.

6. The double-rotary-cylinder double-plunger sliding-key type shaft-plunger three-in-one blowout preventer according to claim 1 is characterized in that the upper shaft-plunger assembly and the lower shaft-plunger assembly are used as a sealing assembly and a transmission assembly of the blowout preventer, outer ring faces of sliding plungers of two sets of upper shaft-plunger assemblies are respectively in precise fit with smooth channels of the upper plunger, outer ring faces of sliding plungers of two sets of lower shaft-plunger assemblies are respectively in precise fit with smooth channels of the lower plunger, sections of sealing ring grooves of the sliding plungers are rectangular, three ○ -shaped sealing rings assist non-metallic sealing between the sliding plungers and a three-hole shell, an arched sealing groove and a rectangular sealing groove of a sliding plunger shell are communicated and are equal in groove depth, a cylindrical surface where a groove bottom face of the arched sealing groove is located and a cylindrical surface where a cylindrical surface of the rectangular sealing groove is located, groove faces on two sides of the arched sealing groove are parallel to each other and are perpendicular to an axis of the transmission shaft, groove faces on two sides of the rectangular sealing groove are parallel to each other and are horizontally arranged, the sliding plungers are arranged along planes of the rectangular sealing groove with parallel sections of inner side faces of the polished rod, the upper shaft-plunger rod, the groove is deeper than the groove bottom face of the sliding plunger rod, the plunger rod is larger than the groove of the plunger rod, the plunger rod is wider groove, the plunger rod is larger than the diameter of the plunger rod, the plunger rod.

7. The twin-rotor twin-ram sliding-key shaft-plug-core three-in-one blowout preventer according to claim 1, wherein: the shell sealing surface of the sliding plunger adopts a cylindrical surface, the diameter of the cylindrical surface where the shell sealing surface is located is larger than that of the cylindrical surface where the outer annular surface of the sliding plunger is located, and the shell sealing surface realizes main sealing between the sliding plunger and the three-hole shell; two rubber core sealing surfaces of the closed sealing rubber core are both planes and are symmetrically arranged on two sides of a rod sealing surface, the rod sealing surface adopts a semi-cylindrical surface, the diameter of the cylindrical surface where the rod sealing surface of the upper shaft plug core assembly is located is smaller than the rod diameter of the polished rod, and the diameter of the cylindrical surface where the rod sealing surface of the lower shaft plug core assembly is located is smaller than the rod diameter of the sucker rod; the rubber core sealing surface realizes the non-metal sealing between the sliding plungers of the upper shaft plug core assembly and the lower shaft plug core assembly, and the rod sealing surface respectively realizes the non-metal sealing between the upper shaft plug core assembly and the polish rod as well as between the lower shaft plug core assembly and the sucker rod.

8. The twin-rotor twin-ram sliding-key shaft-plug-core three-in-one blowout preventer according to claim 1, wherein: the sliding key limiter realizes the axial and circumferential limiting of the upper shaft plug core assembly and the lower shaft plug core assembly, the cylinder wall of the limiting body is in clearance fit with the outer ring surface of the transmission shaft, and meanwhile, the outer ring surface of the limiting body is in clearance fit with the hole wall of the limiting circular hole channel;

the utility model discloses a stopper, including stopper core circular slide way, the stopper core circular slide way is equipped with the sliding key of stopper body, the round hole is dismantled to the sliding key of stopper body and is used for the dismantlement of direction sliding key, the sliding key is dismantled the round hole and is radially arranged and the axis of central line and transmission shaft is crossing perpendicularly along the transmission shaft, according to the direction sliding key of direction sliding key and transmission shaft the biplane sliding pair between the keyway, the biplane sliding pair between plunger and the last stopper core circular slide way that slides and the biplane sliding pair between plunger and the lower stopper core circular slide way that slides, go up the stopper core assembly of axis and lower stopper core assembly.

9. The twin-rotor twin-ram sliding-key shaft-plug-core three-in-one blowout preventer according to claim 1, wherein: the rotary barrel body of the rotary barrel shaft seat is a variable-section long barrel body, an outer hexagon head is adopted in the square diameter of the hexagonal wrench, a columnar clamp of the rotary barrel body is in precise fit with a rotary barrel clamping groove of the square flange, the outer ring surface of the rotary barrel body is in precise fit with a rotary clamping ring of the square flange, trapezoidal transmission internal threads are lathed on the inner wall of an annular cavity of the rotary barrel body, and the trapezoidal transmission internal threads of the rotary barrel body are in precise fit with trapezoidal transmission external threads of transmission shafts of the upper shaft plug core assembly and the lower shaft plug core assembly.

10. The twin-rotor twin-ram sliding-key shaft-plug-core three-in-one blowout preventer according to claim 1, wherein: the square flange of the rotating cylinder shaft seat adopts a square flange plate, the section of a square flange rotating clamping ring is rectangular, the groove length of a square flange rotating cylinder clamping groove is larger than the axial length of a rotating cylinder columnar clamping hoop, a limiting clamping groove of the square flange is matched with a limiting body, and the axial length of the limiting body is larger than the sum of the hole length of a three-hole shell limiting circular hole channel and the groove depth of the square flange limiting clamping groove.

Technical Field

The invention relates to a blowout preventer for normal oil and gas and unconventional oil and gas exploitation and workover operations, in particular to a shaft plug core three-in-one blowout preventer adopting double rotary cylinders, double plungers and double sliding keys.

Background

When conventional oil gas and unconventional oil gas exploitation workover operations are carried out, the technical performance and the field adaptability of the wellhead blowout preventer are the keys of well control management work, and in wellhead safety blowout preventers commonly used in oil field workover operations at home and abroad, the functions of self-sealing blowout preventers, full-sealing blowout preventers and semi-full-sealing blowout preventers are realized independently.

The typical wellhead safety blowout preventer of foreign companies comprises that a blowout preventer of Cameron company adopts radial combined seal, a blowout preventer of Hydril company adopts piston self-tightening seal, a blowout preventer of Shaffer company adopts end surface floating seal and the like, and domestic companies also successively develop integral shearing ram blowout preventers and split shearing ram blowout preventers of various specifications, wherein the blowout preventers mainly realize full sealing, self sealing or half sealing functions of a wellhead during high-pressure drilling operation, but the size height of the blowout preventers is overlarge, the convenience of the operation of a rod column and a tubular column of the wellhead is greatly influenced, meanwhile, the installation and the disassembly of the blowout preventers need special hoisting equipment and are inconvenient, and the current wellhead blowout preventer mainly has the following problems in application:

1) the operation flow of starting the multifunctional blowout preventer to close the wellhead is complex and time-consuming, so that the difficulty of well control is increased.

2) The components of the multifunctional blowout preventer are usually unreasonable in design, and need to be frequently disassembled and assembled during multi-stage drill rod operation, polished rod and sucker rod operation, multi-stage oil pipe operation or hanging of the hanger, so that continuous well control cannot be realized, and the non-production time is prolonged.

3) The conventional blowout preventer needs to be inverted and sealed by the rubber core when in blowout control operation, can not realize continuous sealing of an oil sleeve annulus in the blowout control process, and can not realize safe suspension of the sucker rod and the oil pipe when in blowout control. Even if the oil pipe can be hung, the oil pipe can be hung through the conical surface of the wellhead four-way joint, the reliable sealing under pressure of the oil sleeve annulus cannot be realized, and the operation is more complicated.

4) The semi-full-seal blowout preventer needs to frequently replace a semi-seal ram and a full-seal matched core column, pressure test inspection needs to be carried out when the semi-full-seal ram and the full-seal matched core column are replaced once, and the semi-full-seal blowout preventer is not suitable for a combined rod column or a combined pipe column for conventional workover operation.

Therefore, a wellhead blowout preventer which is truly reliable, practical and convenient to operate is urgently needed on site.

Disclosure of Invention

In order to effectively solve the problem of out-of-control well head during the conventional oil gas and unconventional oil gas exploitation workover operation and overcome the defects and shortcomings of the existing well head blowout prevention technology and blowout preventers thereof, the invention aims to provide a double-rotary-barrel double-plunger sliding-key type shaft plug core three-in-one blowout preventer suitable for the oil gas exploitation workover operation, which adopts a closed sealing rubber core, a three ○ -shaped sealing ring, a shell assembly and combined non-metal sealing between a polish rod and a sucker rod, and effectively controls the wellhead blowout prevention operation in the conventional oil gas and unconventional oil gas exploitation workover process by combining the cylindrical piston type and the shaft plug core three-in-one structure of an upper shaft plug core assembly and a lower shaft plug core assembly according to the screw transmission between a rotary barrel body of a rotary barrel shaft seat and a transmission shaft and the axial and circumferential limiting of a sliding key limiter.

The invention solves the technical problem by adopting the technical scheme that a double-rotary-cylinder double-plunger sliding key type shaft plug core three-in-one blowout preventer is developed, which mainly comprises a shell assembly, an upper shaft plug core assembly, a lower shaft plug core assembly, a sliding key limiter and a rotary-cylinder shaft seat, wherein the shaft plug core three-in-one blowout preventer is connected with a well head sealing box through an upper box joint of the shell assembly and is connected with a well head tee joint into a whole through a lower joint of the shell assembly, the shell assembly adopts a single body, the upper shaft plug core assembly and the lower shaft plug core assembly adopt symmetrically arranged double bodies, the sliding key limiter and the rotary-cylinder shaft seat adopt symmetrically arranged and layered arranged four body structures, the upper plug core smooth channel of the shell assembly is sequentially provided with the double upper shaft plug core assembly and the double sliding key limiter, and the two side ends of the double rotary-cylinder shaft seats are arranged to form an independent polished rod blowout prevention mechanism, and controls the well blowout prevention operation of a polished rod during well workover, meanwhile, the lower plug core smooth channel of the shell assembly is sequentially provided with a double-lower-shaft plug core assembly and a double-sliding-key limiter, and the two side ends of the double-sliding-key limiter are provided with double-rotary-cylinder shaft seats to form an independent lower sucker rod blowout prevention mechanism and control the blowout operation of the sucker rod during well repair.

In the shaft-plug core trinity blowout prevention flow of oil and gas exploitation well repair operation, according to a screw transmission pair and a double-cylindrical surface revolute pair of a polish rod blowout prevention mechanism, screw transmission is implemented, the rotary motion of a rotary cylinder shaft seat is converted into axial movement of a transmission shaft, and by combining a double-plane moving pair and a double-piston moving pair of the polish rod blowout prevention mechanism, two sets of upper shaft-plug core assemblies respectively slide accurately along an upper plug core smooth channel of a shell assembly and clamp a polish rod and compress a closed type sealing rubber core, so that nonmetal sealing and blowout prevention operation between the polish rod blowout prevention mechanism and the polish rod are realized; according to the screw transmission pair and the double-cylindrical surface revolute pair of the lower sucker rod blowout preventing mechanism, screw transmission is implemented, the rotary motion of the rotary cylinder shaft seat is converted into axial movement of the transmission shaft, and by combining the double-plane moving pair and the double-piston moving pair of the lower sucker rod blowout preventing mechanism, two sets of lower shaft plug core assemblies respectively slide accurately along the lower plug core smooth channel of the shell assembly and clamp the sucker rod and compress the closed type sealing rubber core, so that the nonmetal sealing and blowout preventing operation between the lower sucker rod blowout preventing mechanism and the sucker rod is realized.

The shell assembly adopts a double-cross-hole shell, an upper plug core circular slide way and a lower plug core smooth way of the three-hole shell are respectively matched with the upper sucker rod blowout prevention mechanism and the lower sucker rod blowout prevention mechanism, a polished rod and a sucker rod are arranged in a drift diameter rod through hole, and the shell assembly is sequentially provided with an upper box connector, a three-hole shell and a lower drift connector along the axial direction of the polished rod.

Go up box joint and lower logical joint and adopt box round pipe body and pin thread round pipe body respectively to link well head seal box, three hole casings and well head tee bend as an organic whole in proper order, go up the box joint and the lumen that leads to the joint down and bore a hole with the latus rectum pole of three hole casings simultaneously and keep the UNICOM, go up the box joint simultaneously and lead to the minimum diameter of the anchor ring face of the lumen place that connects down and equal the fenestrate aperture of latus rectum pole.

The three-hole shell adopts a flat square column-shaped shell and is sequentially provided with a drift diameter rod through hole, an upper plug core circular slide way and a lower plug core circular slide way, the drift diameter rod through hole is axially arranged along the polished rod, the upper plug core circular slide way and the lower plug core circular slide way are arranged in a layered mode and are simultaneously arranged in a perpendicular and crossed mode with the drift diameter rod through hole, and therefore the inner hole channels of the three-hole shell are in a double-cross shape. The through hole of the drift diameter rod adopts an equal-diameter circular through hole, and the aperture of the through hole of the drift diameter rod is larger than the maximum outer diameters of the polished rod and a coupling at the joint of the polished rod and the sucker rod. The upper plug core circular slide way and the lower plug core circular slide way are formed by combining a sliding circular hole channel and two limiting circular hole channels, the two limiting circular hole channels are symmetrically arranged at two side ends of the sliding circular hole channel, two sets of upper plug core assemblies and two sets of lower plug core assemblies are respectively arranged in the sliding circular hole channels of the upper plug core circular slide way and the lower plug core circular slide way, sliding key limiters of the same model are respectively arranged in the two limiting circular hole channels of the upper plug core circular slide way and the two limiting circular hole channels of the lower plug core circular slide way, and meanwhile, screw holes are respectively turned on the end surfaces of two sides of the three-hole shell along the circumferential direction of the limiting circular hole channels, and four sets of rotary cylinder shaft seats of the same model are connected to two sides of the shell assembly through.

The upper shaft plug core assembly and the lower shaft plug core assembly both adopt a structure integrating a cylindrical piston and a shaft plug core into a whole and serve as a sealing assembly and a transmission assembly of the blowout preventer, the polish rod and the sucker rod are respectively clamped by the two sets of the upper shaft plug core assembly and the lower shaft plug core assembly, the combined non-metal sealing of a closed sealing rubber core and a three ○ -shaped sealing ring and the blowout prevention operation of a well head are realized, and each set of the upper shaft plug core assembly and the lower shaft plug core assembly respectively comprise a transmission shaft, a sliding plunger, a closed sealing rubber core and a three ○ -shaped sealing ring.

The transmission shaft, the sliding plunger piston and the closed type sealing rubber core are integrated by a shaft plug core, wherein the transmission shaft and the sliding plunger piston are integrally processed by cylindrical alloy steel, and the sliding plunger piston and the closed type sealing rubber core are integrally processed by a vulcanization process. The transmission shaft adopts cylindric slender rod, and the plunger that slides adopts cylindric piston, and the transmission shaft has the direction keyway that slides along the radial outside car system trapezoidal transmission external screw thread of polished rod and its inboard milling, and the direction keyway that slides adopts clearance fit along the axial arrangement of transmission shaft and between its tank bottom surface and the key bottom surface of direction feather key, and the both sides cell wall of the keyway that slides of direction simultaneously slides respectively with the both sides face of direction feather key between accurate cooperation and constitute the biplanar pair of moving.

The section of the sliding plunger sealing ring groove is rectangular and is arranged in layers at equal intervals along the radial direction of the polish rod, three ○ -shaped sealing rings are arranged in the sealing ring groove of the sliding plunger, the sliding plunger is assisted in non-metal sealing between the sliding plunger and a three-hole shell, the shell sealing groove of the sliding plunger is formed by combining an arched sealing groove and two rectangular sealing grooves, the arched sealing groove and the rectangular sealing groove are communicated and have the same groove depth, the two rectangular sealing grooves are symmetrically arranged at two sides of the arched sealing groove, the cylindrical surface of the groove bottom surface of the arched sealing groove and the cylindrical surface of the rectangular sealing groove are positioned on the same cylinder surface, the groove bottom surfaces at two sides of the arched sealing groove are parallel to each other and are perpendicular to the axial line of the rectangular sealing groove, the groove end surfaces at two sides of the sealing groove are parallel to each other and are arranged horizontally, the plunger is arranged along the radial direction of the polish rod, the diameter of the sliding plunger is larger than the groove of the sliding plunger rod, the diameter of the sliding plunger rod is larger than the groove, the groove of the sliding plunger rod, the inner side surface of the sliding plunger rod, the sliding plunger rod is arranged in the groove, the sliding plunger rod is larger than the groove, the diameter of the sliding plunger rod, the groove, the sliding plunger rod is larger than the diameter of the sliding plunger rod, the diameter of the sliding plunger rod, the sliding groove, the sliding plunger rod, the sliding groove is larger than the sliding groove, the sliding plunger rod, the sliding groove, the diameter.

The shell sealing groove and the rod sealing groove of the sliding plunger are communicated and filled with the closed sealing rubber core, so that the closed sealing rubber core becomes an uninterrupted continuous integral rubber core. The closed type sealing rubber core of the groove top surface of the shell sealing groove and the groove surfaces on two sides of the rod sealing groove is provided with a shell sealing surface, the shell sealing surface adopts a cylindrical surface, the diameter of the cylindrical surface where the shell sealing surface is located is larger than that of the cylindrical surface where the outer annular surface of the sliding plunger is located, the shell sealing surface is a sealing surface of an upper plunger core circular slide way and a lower plunger core circular slide way, and main sealing between the sliding plunger and the three-hole shell is realized. The inner side end surface of the closed type sealing rubber core along the radial direction of the polished rod is formed by combining a rod sealing surface and two rubber core sealing surfaces, the two rubber core sealing surfaces are both planar and are symmetrically arranged on two sides of the rod sealing surface, the rod sealing surface adopts a semi-cylindrical surface, the diameter of the cylindrical surface where the rod sealing surface of the upper shaft plug core assembly is located is smaller than the rod diameter of the polished rod, and the diameter of the cylindrical surface where the rod sealing surface of the lower shaft plug core assembly is located is smaller than the rod diameter of the sucker rod; the rubber core sealing surface is a sealing surface of a sliding plunger, non-metal sealing between the sliding plungers of the upper shaft plug core assembly and the lower shaft plug core assembly is realized, the rod sealing surface is a sealing surface of a polished rod and a sucker rod, and non-metal sealing between the upper shaft plug core assembly and the polished rod and between the lower shaft plug core assembly and the sucker rod are respectively realized.

The sliding key limiter realizes the accurate sliding of the upper shaft plug core assembly and the lower shaft plug core assembly and the axial and circumferential limiting thereof according to the double-plane sliding pair and the double-piston sliding pair, and comprises a limiting body and a guide sliding key.

The guide sliding key is a common guide flat key, the limiting body is a thick-wall cylinder, the cylinder wall of the limiting body is in clearance fit with the outer ring surface of the transmission shaft, meanwhile, the outer ring surface of the limiting body is in clearance fit with the hole wall of the limiting circular hole channel, and the end surface of the inner side of the limiting body along the radial direction of the polish rod is matched with the end surface of the outer side of the sliding plunger to realize axial limiting in the opening process of the upper shaft plug core assembly and the lower shaft plug core assembly.

The wall of the limiting body is milled with a guiding limiting key groove, a sliding key dismounting round hole is drilled in the groove top surface of the guiding limiting key groove and used for dismounting the guiding sliding key, and the sliding key dismounting round hole is radially arranged along the transmission shaft and is vertically intersected with the axis of the transmission shaft along the center line. The two side groove walls of the guide limiting key groove and the two side surfaces of the guide sliding key are in interference fit, and the groove top surface of the guide limiting key groove and the key top surface of the guide sliding key are in clearance fit, so that the fixation between the guide sliding key and the limiting body and the circumferential limiting of the upper plug core assembly and the lower plug core assembly are realized, meanwhile, the upper plug core assembly and the lower plug core assembly accurately slide along the upper plug core circular slide way and the lower plug core circular slide way respectively according to the biplane sliding pair between the guide sliding key and the guide sliding key groove of the transmission shaft, the double-piston sliding pair between the sliding plunger and the upper plug core circular slide way and the double-piston sliding pair between the sliding plunger and the lower plug core circular slide way.

The rotary cylinder shaft seat adopts a side door type rotary movable cylinder structure, performs spiral transmission according to a spiral transmission pair and a double-cylindrical surface rotating pair, converts the rotary motion of the rotary cylinder body into axial movement of a transmission shaft, and comprises the rotary cylinder body and a square flange.

The rotary cylinder body is a variable cross-section long cylinder body, the inner side and the outer side of the rotary cylinder body along the radial direction of the polished rod are respectively provided with a columnar clamp and a hexagonal wrench square diameter, the hexagonal wrench square diameter adopts an outer hexagonal head and is matched with a hexagonal wrench, the columnar clamp of the rotary cylinder body is precisely matched with a rotary cylinder clamping groove of the square flange, and the outer ring surface of the rotary cylinder body is precisely matched with a rotary clamping ring of the square flange to form a double-cylindrical surface revolute pair. Trapezoidal transmission internal threads are lathed on the inner wall of the annular cavity of the rotary cylinder body, and the trapezoidal transmission internal threads of the rotary cylinder body are simultaneously precisely matched with the trapezoidal transmission external threads of the transmission shafts of the upper shaft plug core assembly and the lower shaft plug core assembly to form a spiral transmission pair.

The square flange adopts a square flange plate, a limiting clamping groove, a rotary cylinder clamping groove and a rotary clamping ring are sequentially arranged on the inner wall of an annular cavity of the square flange along the radial direction of a polished rod, the section of the rotary clamping ring of the square flange is rectangular, the groove length of the rotary cylinder clamping groove of the square flange is greater than the axial length of a cylindrical clamp of a rotary cylinder body, the limiting clamping groove of the square flange is matched with a limiting body to realize the axial fixation of a sliding key limiter, and the axial length of the limiting body is greater than the sum of the hole length of a limiting circular hole passage of a three-hole shell and the groove depth of. Round holes are drilled at the four corners of the square flange, correspond to the screw holes of the three-hole shell and are matched with the screws.

The invention has the technical effects that an upper plug core circular slideway and a lower plug core smooth channel of a shell assembly are respectively matched with an upper sucker rod blowout prevention mechanism and a lower sucker rod blowout prevention mechanism, a drift diameter rod penetrates through a polished rod and a sucker rod in a through hole, a rotary cylinder shaft seat performs spiral transmission according to a spiral transmission pair and a double-cylindrical surface rotating pair and converts the rotary motion of a rotary cylinder body into axial movement of a transmission shaft, the upper plug core assembly and the lower plug core assembly are both of a cylindrical piston type and shaft plug core three-in-one structure, and two sets of upper plug core assemblies and lower plug core assemblies respectively perform accurate sliding along the upper plug core circular slideway and the lower plug core smooth channel of a three-hole shell according to a double-plane moving pair and a double-piston moving pair and respectively clamp the polished rod and the sucker rod to realize the combined nonmetal sealing of a closed sealing rubber core and a three ○ -shaped sealing ring, thereby effectively controlling the wellhead blowout prevention operation in the well repairing process of conventional oil gas and uncon.

Drawings

The present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to the following examples.

FIG. 1 is a schematic diagram of a typical dual-barrel dual-plunger sliding-key shaft-plug-core triple-in-one blowout preventer according to the present invention.

Fig. 2 is a left side view of fig. 1.

FIG. 3 is a schematic diagram of a housing assembly in a dual-spool dual-ram sliding-key shaft-plug-core triple-function blowout preventer.

FIG. 4 is a schematic diagram of an upper shaft plug core assembly in a dual barrel dual ram sliding key type shaft plug core triple blowout preventer.

FIG. 5 is a schematic view of the sliding plunger and the transmission shaft in the upper shaft plug core assembly and the lower shaft plug core assembly

FIG. 6 is a schematic view of a lower shaft plug assembly in a dual barrel dual ram sliding key type shaft plug three in one blowout preventer.

FIG. 7 is a schematic diagram of a feather key stop in a dual barrel dual ram feather key type shaft plug core triple in blowout preventer.

FIG. 8 is a schematic diagram of a dual-rotor dual-plunger sliding key type shaft plug core three-in-one blowout preventer.

FIG. 9 is a schematic diagram of a top polish rod blowout preventer mechanism in a dual barrel dual ram sliding key type shaft-plug core triple blowout preventer.

FIG. 10 is a schematic diagram of the lower sucker rod blowout preventer mechanism in a dual barrel dual ram sliding key type shaft plug core triple in blowout preventer.

FIG. 11 is a schematic diagram of shaft-plug-core three-in-one polish rod blowout prevention flow of a double-rotary-cylinder double-plunger sliding-key type shaft-plug-core three-in-one blowout preventer in oil and gas exploitation and workover operations.

FIG. 12 is a simplified diagram of the shaft-plug-core three-in-one sucker rod blowout prevention process in the dual-rotary-cylinder dual-plunger sliding-key type shaft-plug-core three-in-one blowout preventer for oil and gas production and workover operations.

In the drawing, 1-a shell assembly, 2-an upper shaft plug core assembly, 3-a sliding key limiter, 4-a rotary barrel shaft seat, 5-a lower shaft plug core assembly, 6-an upper box joint, 7-a three-hole shell, 8-a lower through joint, 9-a through-diameter rod perforation, 10-a sliding circular hole channel, 11-a limiting circular hole channel, 12-a lower plug core circular slide channel, 13-an upper plug core circular slide channel, 14-a sliding plunger, 15-a closed sealing rubber core, 16-a three ○ -shaped sealing ring, 17-a transmission shaft, 18-a rod sealing groove, 19-a shell sealing groove, 20-a sealing ring groove, 21-a guiding sliding key groove, 22-trapezoidal transmission external threads, 23-a rubber core sealing surface, 24-a rod sealing surface, 25-a rod clamping groove, 26-a shell sealing surface, 27-a guiding sliding key, 28-a limiting body, 29-a guiding limiting key groove, 30-an upper sliding key dismounting circular hole, 31-a square flange, 32-a rotary barrel body, 33-a columnar clamping groove, 34-a rotary barrel, 35-a limiting key, 36-a hexagonal wrench, 37-a hexagonal transmission rod auxiliary mechanism, a double-square-auxiliary transmission rod mechanism, a double-sliding mechanism, a double-a double-auxiliary coupling mechanism, a double-rotating mechanism, a double-screw rod coupling mechanism.

Detailed Description

In fig. 1 and 2, the double-rotary-cylinder double-plunger sliding-key type shaft-plug core three-in-one blowout preventer comprises a shell assembly 1, an upper shaft-plug core assembly 2, a sliding-key limiter 3, a rotary-cylinder shaft seat 4 and a lower shaft-plug core assembly 5, and adopts a closed sealing rubber core and a three ○ -shaped sealing ring of the upper shaft-plug core assembly 2 and the lower shaft-plug core assembly 5, combined non-metal seals between the shell assembly 1 and a polish rod and a sucker rod, and axial and circumferential limits of the sliding-key limiter 3 according to screw transmission between a rotary cylinder body and a transmission shaft of the rotary-cylinder shaft seat 4, and simultaneously combines a piston-type and shaft-plug core three-in-one structure of the upper shaft-plug core assembly 2 and the lower shaft-plug core assembly 5, so as to effectively control wellhead blowout prevention operation in the conventional oil gas and unconventional oil gas well repairing process.

In fig. 1 and 2, the double-rotary-cylinder double-plunger sliding-key type shaft plug core three-in-one blowout preventer is connected with a wellhead sealing box through an upper box joint of a shell assembly 1 and is connected with a wellhead tee joint into a whole through a lower through joint of the shell assembly 1, the shell assembly 1 adopts a single body, the upper shaft plug core assembly 2 and a lower shaft plug core assembly 5 adopt symmetrically arranged double bodies, and a sliding key stopper 3 and a rotary-cylinder shaft seat 4 adopt a four-body structure which is symmetrically arranged and arranged in layers.

In fig. 1 and 2, before the dual-rotary-drum dual-plunger sliding-key type shaft-plug core three-in-one blowout preventer is assembled, the outer surfaces of a shell assembly 1 and each rotary-drum shaft seat 4 are respectively subjected to paint spraying and corrosion prevention treatment, an upper shaft plug core assembly 2 is arranged in an upper plug core smooth channel of the shell assembly 1, a lower shaft plug core assembly 5 is arranged in a lower plug core circular slide channel of the shell assembly 1 and then reciprocates, the operation is flexible and free of stagnation, after a transmission shaft of the upper shaft plug core assembly 2 and a transmission shaft of the lower shaft plug core assembly 5 are matched with a guide sliding key of a sliding key stopper 3, the movement is flexible and free of stagnation, after a transmission shaft of the upper shaft plug core assembly 2 and the transmission shaft plug core assembly 5 is matched with a spiral transmission pair between rotary drums of the rotary-drum shaft seats 4, the rotation is flexible and free of stagnation, when a through-diameter rod perforation of the shell assembly 1 is checked by using a through-diameter gauge, the blockage phenomenon of the inner wall of the shell assembly 1 and the inner wall of the rotary-drum shaft seat 4 is kept clean, and simultaneously, and whether a trapezoidal thread sealing ring of the transmission shaft plug core assembly is connected with a trapezoidal thread sealing ring of a trapezoidal thread stopper ○.

In fig. 1 and 2, when the dual-rotary-cylinder dual-plunger sliding-key type shaft-plug-core three-in-one blowout preventer is assembled, the transmission shafts, the sliding plungers and the closed sealing rubber cores of the upper shaft-plug-core assembly 2 and the lower shaft-plug-core assembly 5 complete the three-in-one processing of the shaft-plug-core, the limiting bodies of the sliding key limiters 3 are sleeved in the transmission shafts and then are assembled with the guiding sliding keys, the square flange of each rotary-cylinder shaft seat 4 is sleeved in the rotary-cylinder body and is assembled with the screw transmission pair between the rotary-cylinder body and the transmission shafts, so that an upper polish rod blowout prevention mechanism and a lower sucker rod blowout prevention mechanism are respectively combined, and finally the upper polish rod blowout prevention mechanism and the lower sucker rod blowout prevention mechanism are respectively arranged in the upper plug-core circular slideway and the lower.

In fig. 1 and 2, the type of the double-rotary-cylinder double-plunger sliding-key type shaft plug core three-in-one blowout preventer is consistent with the type of a wellhead sealing box and a wellhead tee joint which are matched with an oil-gas well, and meanwhile, the double-rotary-cylinder double-plunger sliding-key type shaft plug core three-in-one blowout preventer needs to be subjected to sealing performance tests according to debugging and acceptance requirements.

In fig. 3, a shell assembly 1 is sequentially provided with an upper box joint 6, a three-hole shell 7 and a lower through joint 8 along the axial direction of a polished rod, the design of the three-hole shell 7 needs to consider factors such as the maximum flow pressure of oil-gas media of a shaft, the specification of the upper box joint 6 is consistent with that of a wellhead sealing box, the specification of the lower through joint 8 is consistent with that of a wellhead tee joint, the hole length of a sliding circular hole channel 10 needs to be more than twice of the sum of the axial length of a sliding plunger and the maximum pushing distance thereof, the specification of a limiting circular hole channel 11 is consistent with that of a sliding key limiter 3, and the aperture of a through hole 9 of a drift diameter rod is more than the maximum outer diameters of the polished rod and a coupling.

In fig. 3, an upper plug core smooth channel 13 and a lower plug core circular slideway 12 of a three-hole shell 7 in a shell assembly 1 are respectively matched with an upper sucker rod blowout prevention mechanism and a lower sucker rod blowout prevention mechanism, a polish rod and a sucker rod are arranged in a drift diameter rod perforation 9 of the three-hole shell 7, a wellhead sealing box, the three-hole shell 7 and a wellhead tee joint are sequentially connected into a whole by an upper box joint 6 and a lower drift joint 8, two sets of upper plug core assemblies 2 and two sets of lower plug core assemblies 5 are respectively arranged in sliding circular channels 10 of the upper plug core smooth channel 13 and the lower plug core smooth channel 12, two limit circular channels 11 of the upper plug core circular slideway 13 and two limit circular channels 11 of the lower plug core circular slideway 12 are respectively provided with sliding key stoppers 3 of the same type, and four sets of rotary cylinders 4 of the same type are connected to two sides of the shell assembly 1 by the three-hole shell 7 through screws.

In fig. 4 to 6, each set of upper shaft plug core assembly 2 and lower shaft plug core assembly 5 includes a sliding plunger 14, a closed sealing rubber core 15, a three ○ -shaped sealing ring 16 and a transmission shaft 17, the specification of the sliding plunger 14 is consistent with the aperture of the sliding circular hole 10, the design of the closed sealing rubber core 15 and the three ○ -shaped sealing ring 16 needs to consider the aperture of the sliding circular hole 10, the maximum flow pressure of the oil-gas medium of the shaft, and other factors, the specification of the rod clamping groove 25 of the upper shaft plug core assembly 2 is consistent with the rod diameter of the polish rod, the specification of the rod clamping groove 25 of the lower shaft plug core assembly 5 is consistent with the rod diameter of the sucker rod, the groove width of the guiding sliding key groove 21 is consistent with the key width of the guiding sliding key of the sliding key stopper 3, the groove length of the guiding sliding key groove 21 is greater than the sum of the key length of the guiding sliding key of the sliding key stopper 3 and the maximum push stroke of the sliding plunger 14, and the total length of the trapezoidal transmission external thread 22 is.

In fig. 4-6, two sets of upper shaft plug core assemblies 2 and lower shaft plug core assemblies 5 respectively clamp a polish rod and a sucker rod and realize the combined non-metal sealing of a closed sealing rubber core 15 and a three ○ -shaped sealing ring 16 and well mouth blowout prevention operation, a trapezoidal transmission external thread 22 is lathed on the outer side of a transmission shaft 17, the groove bottom surface of a guide sliding key groove 21 and the key bottom surface of a guide sliding key of a sliding key limiter 3 are in clearance fit, and an arched sealing groove of a shell sealing groove 19 is communicated with a rectangular sealing groove.

In fig. 4-6, the upper shaft plug core assembly 2 and the lower shaft plug core assembly 5 are used as a sealing assembly and a transmission assembly of a blowout preventer, a rod sealing groove 18 and a shell sealing groove 19 are communicated and filled with a closed sealing rubber core 15, a sealing ring groove 20 of a sliding plunger 14 is internally provided with three ○ -shaped sealing rings 16 and assists in non-metal sealing between the sliding plunger 14 and a three-hole shell 7, a shell sealing surface 26 is a sealing surface of an upper plug core smooth channel 13 and a lower plug core smooth channel 12 and realizes main sealing between the sliding plunger 14 and the three-hole shell 7, a rubber core sealing surface 23 is a sealing surface of the sliding plunger 14 and realizes non-metal sealing between the upper shaft plug core assembly 2 and the sliding plunger 14 of the lower shaft plug core assembly 5, a rod sealing surface 24 is a sealing surface of a polish rod and a sucker rod and respectively realizes non-metal sealing between the upper shaft plug core assembly 2 and the polish rod, and between the lower shaft plug core assembly 5 and.

In fig. 7, the sliding key stopper 3 includes a guiding sliding key 27 and a stopper 28, the axial length of the stopper 28 is greater than the sum of the hole length of the stopper circular hole 11 and the groove depth of the stopper groove of the square flange of the spin-barrel shaft seat 4, the groove width of the guiding stopper key groove 29 is consistent with the key width of the guiding sliding key 27, and the groove length of the guiding stopper key groove 29 is greater than the key length of the guiding sliding key 27.

In fig. 7, the sliding key stopper 3 realizes the precise sliding of the upper shaft plug core assembly 2 and the lower shaft plug core assembly 5 according to the biplane sliding pair and the double piston sliding pair, the stopper 28, the transmission shaft 17 and the stopper circular hole channel 11 are in clearance fit, the sliding key detaching circular hole 30 is used for detaching the guide sliding key 27, the inner side end surface of the stopper 28 along the polish rod radial direction is matched with the outer side end surface of the sliding plunger 14 and realizes the axial limiting in the opening process of the upper shaft plug core assembly 2 and the lower shaft plug core assembly 5, the groove walls of the two sides of the guide limiting key groove 29 and the two side surfaces of the guide sliding key 27 are in interference fit, and the groove top surface of the guide limiting key groove 29 and the key top surface of the guide sliding key 27 are in clearance fit, thereby realizing the fixation between the guide sliding key 27 and the stopper 28 and the circumferential limiting of the upper shaft plug core assembly 2 and the lower shaft plug core assembly 5.

In fig. 8, the rotary cylinder shaft seat 4 comprises a square flange 31 and a rotary cylinder body 32, the specification of the trapezoidal transmission internal thread 38 of the rotary cylinder body 32 is consistent with the specification of the trapezoidal transmission external thread 22 of the transmission shaft 17, the total length of the trapezoidal transmission internal thread 38 is greater than the maximum pushing distance of the sliding plunger 14, the model of the square flange 31 is consistent with the area of the end faces on the two sides of the three-hole shell 7, and the specification of the square diameter 37 of the hexagonal wrench is consistent with the model of the hexagonal wrench.

In fig. 8, the rotary cylinder shaft seat 4 performs spiral transmission according to a spiral transmission pair and a double-cylindrical surface rotation pair and converts the rotation motion of the rotary cylinder body 32 into axial movement of the transmission shaft 17, a hexagonal wrench square diameter 37 is matched with a hexagonal wrench, a columnar hoop 33 and a rotary cylinder clamping groove 34 form the double-cylindrical surface rotation pair between the rotary cylinder body 32 and a rotary clamping ring 36, a trapezoidal transmission internal thread 38 is lathed on the inner wall of a ring cavity of the rotary cylinder body 32, and a limit clamping groove 35 of a square flange 31 is matched with a limit body 28 to realize axial fixation of the sliding key limiter 3.

In fig. 9 and 10, the upper plug core circular slideway 13 of the housing assembly 1 in the double-rotary-cylinder double-plunger sliding-key type shaft-plug core three-in-one blowout preventer is sequentially provided with the double-upper shaft plug core assembly 2 and the double-sliding-key stopper 3, and both side ends of the housing assembly 1 are respectively provided with the rotary-cylinder shaft seats 4 to form an independent upper sucker rod blowout prevention mechanism 39, and control the blowout operation of a polished rod during workover, and simultaneously, the lower plug core circular slideway 12 of the housing assembly 1 is sequentially provided with the double-lower shaft plug core assembly 5 and the double-sliding-key stopper 3, and both side ends of the housing assembly 1 are respectively provided with the rotary-cylinder shaft seats 4 to form an independent lower sucker rod blowout prevention mechanism 40, and control the blowout operation of a sucker rod during workover.

In fig. 9 and 10, a biplane moving pair 41 is formed between the guide sliding key groove 21 and the guide sliding key 27 of the upper sucker rod blowout preventing mechanism 39 and the lower sucker rod blowout preventing mechanism 40, a double-piston moving pair 42 is formed between the sliding plunger 14 and the upper plug core smooth channel 13 of the upper sucker rod blowout preventing mechanism 39, a double-piston moving pair 42 is also formed between the sliding plunger 14 and the lower plug core smooth channel 12 of the lower sucker rod blowout preventing mechanism 40, the upper plug core assembly 2 and the lower plug core assembly 5 respectively perform accurate sliding along the upper plug core smooth channel 13 and the lower plug core circular channel 12, a double-cylinder rotating pair 43 is formed between the upper sucker rod blowout preventing mechanism 39 and the lower sucker rod blowout preventing mechanism 40 and the rotating cylinder clamping groove 34 of the square flange 31 and the rotating cylinder body 32 of the square flange 31, a screw transmission pair 44 is formed between the trapezoidal transmission internal thread 38 of the rotary cylinder body 32 of the upper polish rod blowout preventing mechanism 39 and the lower sucker rod blowout preventing mechanism 40 and the trapezoidal transmission external thread 22 of the transmission shaft 17.

In fig. 11, in the shaft-plug-core three-in-one polished rod blowout prevention flow of the double-rotary-cylinder double-plunger sliding-key type shaft-plug-core three-in-one blowout preventer oil-gas exploitation workover operation, the lower shaft-plug-core assembly 5 in the lower sucker rod blowout prevention mechanism 40 is always in an open state, and the coupling 46 and the sucker rod 47 are positioned in the through-hole rod through hole 9 at the lower part of the upper plug-core smooth passage 13; the hexagonal wrench square diameter 37 of the upper polish rod blowout preventing mechanism 39 is matched with the hexagonal wrench and provides power, the upper polish rod blowout preventing mechanism 39 implements screw transmission according to a double-cylindrical surface rotating pair 43 between the cylindrical hoop 33 and the rotary cylinder clamping groove 34 and between the rotary cylinder body 32 and the rotary clamping ring 36 and a screw transmission pair 44 between the trapezoidal transmission internal thread 38 and the trapezoidal transmission external thread 22, and converts the rotary motion of the rotary cylinder body 32 into axial inward movement of the transmission shaft 17, then, by combining the double-plane moving pair 41 between the guide sliding key groove 21 and the guide sliding key 27 and the double-piston moving pair 42 between the sliding plunger 14 and the upper plunger core smooth channel 13, two sets of upper plunger core assemblies 2 of the upper polish rod blowout preventing mechanism 39 accurately slide inwards along the upper plunger core smooth channel 13 and clamp the polish rod 45 and compress the closed type sealant core 15 respectively, so that the nonmetal sealing and blowout preventing operation between the upper polish rod blowout preventing mechanism 39 and the polish rod 45 is realized.

In fig. 11, in the shaft-plug-core three-in-one polish rod blowout prevention flow of the double-rotary-barrel double-plunger sliding-key type shaft-plug-core three-in-one blowout preventer oil-gas exploitation workover operation, the lower shaft-plug-core assembly 5 is always in an open state, the square diameter 37 of the hexagonal wrench is matched with the hexagonal wrench and provides power, the upper polish rod blowout prevention mechanism 39 implements reverse screw transmission and converts the rotary motion of the rotary barrel body 32 into axial outward movement of the transmission shaft 17 according to the cylindrical collar 33, the rotary-barrel clamping groove 34, the double-cylindrical surface rotating pair 43 between the rotary barrel body 32 and the rotary collar 36, and the screw transmission pair 44 between the trapezoidal transmission internal thread 38 and the trapezoidal transmission external thread 22, and then the two sets of upper plug-core assemblies 2 of the upper polish rod blowout prevention mechanism 39 precisely slide outwards along the upper plug-core circular slide ways 13 in combination with the double-plane moving pair 41 between the guide sliding key groove 21 and the guide sliding key 27 and the double-piston moving pair, then, the upper plug core assembly 2 restores the closed type sealant core 15 in the rod sealing groove 18 to a free state until the inner end surface of the stopper 28 of the upper polish rod blowout preventing mechanism 39 in the radial direction of the polish rod is matched with the outer end surface of the sliding plunger 14, thereby completing the opening operation of the upper polish rod blowout preventing mechanism 39.

In fig. 12, in the blowout prevention flow of the shaft-plug-core three-in-one sucker rod of the double-rotary-cylinder double-plunger sliding-key type shaft-plug-core three-in-one blowout preventer oil-gas exploitation workover operation, the upper shaft-plug-core assembly 2 in the upper sucker rod blowout prevention mechanism 39 is always in an open state, and the polish rod 45 and the coupling 46 are positioned in the drift diameter rod through hole 9 at the upper part of the lower plug core smooth channel 12; the hexagonal wrench square diameter 37 of the lower sucker rod blowout preventing mechanism 40 is matched with the hexagonal wrench and provides power, the lower sucker rod blowout preventing mechanism 40 implements spiral transmission according to the double-cylindrical surface rotating pair 43 between the column-shaped clamp 33 and the rotary cylinder clamping groove 34 and between the rotary cylinder body 32 and the rotary clamping ring 36 and the spiral transmission pair 44 between the trapezoidal transmission internal thread 38 and the trapezoidal transmission external thread 22, and converts the rotary motion of the rotary cylinder body 32 into axial inward movement of the transmission shaft 17, then, by combining the double-plane moving pair 41 between the guide sliding key groove 21 and the guide sliding key 27 and the double-piston moving pair 42 between the sliding plunger 14 and the lower plunger smooth channel 12, two sets of lower shaft plunger assemblies 5 of the lower sucker rod blowout preventing mechanism 40 accurately slide inwards along the lower plunger smooth channel 12 and clamp the sucker rod 47 and compress the closed type sealing rubber core 15 respectively, so that the nonmetal sealing and blowout preventing operation between the lower sucker rod blowout preventing mechanism 40 and the sucker rod 47 is realized.

In fig. 12, in the blowout prevention flow of the shaft-plug-core three-in-one sucker rod of the double-rotary-barrel double-plunger sliding-key type shaft-plug-core three-in-one blowout preventer for oil and gas production and workover operations, the upper shaft-plug-core assembly 2 is always in an open state, the square diameter 37 of the hexagonal wrench is matched with the hexagonal wrench and provides power, the lower sucker rod blowout prevention mechanism 40 implements reverse screw transmission and converts the rotary motion of the rotary barrel body 32 into axial outward movement of the transmission shaft 17 according to the cylindrical clamp 33, the double-cylindrical-surface revolute pair 43 between the rotary barrel clamp groove 34 and the rotary clamp ring 36, and the screw transmission pair 44 between the trapezoidal transmission internal thread 38 and the trapezoidal transmission external thread 22, and then combines the double-plane revolute pair 41 between the guide sliding key groove 21 and the guide sliding key 27 and the double-piston pair 42 between the sliding plunger 14 and the lower plug-core smooth passage 12, and the two lower shaft-plug-core assemblies 5 of the lower sucker rod blowout prevention, and then the closed type sealing rubber core 15 in the rod sealing groove 18 of the lower shaft plug core assembly 5 is restored to a free state until the inner side end face of the limiting body 28 of the lower sucker rod blowout preventing mechanism 40 along the radial direction of the polish rod is matched with the outer side end face of the sliding plunger 14, so that the opening operation of the lower sucker rod blowout preventing mechanism 40 is completed.

The above embodiments are only used for illustrating the present invention, and the structure, connection mode and the like of each component can be changed, and all equivalent changes and improvements made on the basis of the technical scheme of the present invention should not be excluded from the protection scope of the present invention.