阅读说明：本技术 井筒防喷堵塞器 (Blowout prevention blanking plug for shaft ) 是由 代国伟 程军 马宝龙 李可庆 付显威 王振清 李子芳 孙阳 郭胜 张瑾 代文君 于 2019-01-07 设计创作，主要内容包括：本发明公开了井筒防喷堵塞器,包括锚定总成、封堵总成,还包括封锚操作总成,所述锚定总成下端连接封堵总成,所述封锚操作总成插入锚定总成内腔和封堵总成内腔中,所述封锚操作总成通过自身的扭矩管传动式连接锚定总成的锚定拨叉,所述封锚操作总成通过自身的中心拉管连接封堵总成的下接头。本发明作业施工需倒换井口作业时,在无需拆除防喷器,直接通过井架提升系统把该装置置入井筒内,通过液压钳旋转、上提压缩坐封,快速实现井筒封堵。防止井喷事故发生。(The invention discloses a blowout prevention blanking plug for a shaft, which comprises an anchoring assembly, a plugging assembly and an anchor sealing operation assembly, wherein the lower end of the anchoring assembly is connected with the plugging assembly, the anchor sealing operation assembly is inserted into an inner cavity of the anchoring assembly and an inner cavity of the plugging assembly, the anchor sealing operation assembly is in transmission connection with an anchoring shifting fork of the anchoring assembly through a torque tube of the anchor sealing operation assembly, and the anchor sealing operation assembly is connected with a lower joint of the plugging assembly through a central pull tube of the anchor sealing operation assembly. When the operation construction of the invention needs to change the well mouth operation, the blowout preventer is not needed to be removed, the device is directly placed into the shaft through the derrick lifting system, and the shaft is quickly plugged by rotating and lifting the compression setting hydraulic tongs. The blowout accident is prevented.)

1. The blowout prevention blanking plug for the shaft comprises an anchoring assembly and a plugging assembly, and is characterized by further comprising an anchor sealing operation assembly, wherein the lower end of the anchoring assembly is connected with the plugging assembly, the anchor sealing operation assembly is inserted into an inner cavity of the anchoring assembly and an inner cavity of the plugging assembly, the anchor sealing operation assembly is connected with an anchoring shifting fork of the anchoring assembly in a torque tube transmission mode through the anchor sealing operation assembly, and the anchor sealing operation assembly is connected with a lower joint of the plugging assembly through a central pull tube of the anchor sealing operation assembly.

2. The wellbore blowout prevention blanking plug according to claim 1, wherein the anchor sealing operation assembly comprises a central pull tube, a torque tube, a reversing bin, a reversing block, a reversing track seat, a bearing gland, a reversing pull tube and a positioning joint, wherein the upper end of the torque tube is in threaded connection with the reversing bin, the lower end of the torque tube is in threaded connection with the central pull tube, the outer wall of the torque tube is in transmission connection with an anchoring shifting fork, the upper end of the reversing bin is in threaded connection with the outer wall of the reversing track seat, the inner wall of the reversing track seat is provided with the bearing seat, the bearing is arranged on the bearing seat, the upper end port of the reversing track seat is in threaded connection with the bearing gland, the lower end of the bearing gland presses the bearing, the reversing pull rod sequentially penetrates through a central hole of the bearing gland and an inner cavity of the reversing track seat from top to bottom, the lower end of the, the upper end of the reversing pull rod is in threaded connection with the positioning connector, an outer positioning step is arranged on the outer wall of the positioning connector, and the outer positioning step on the outer wall of the positioning connector corresponds to an inner positioning step arranged on the inner wall of the positioning bin at the upper end of the anchoring assembly.

3. The blowout prevention blanking plug for the shaft according to claim 1 or 2, wherein the outer wall of the reversing block is provided with a convex reversing block torque fin, and the inner wall of the inner cavity of the lower half section of the reversing track seat is provided with a reversing track which is adaptive to the shape of the reversing block torque fin.

4. The wellbore blowout prevention plug according to claim 1 or 2, wherein the outer wall of the torque tube is hexagonal, the inner wall of the anchoring fork of the anchoring assembly is a hexagonal hole, the torque tube is inserted into the anchoring fork, and the outer wall of the torque tube is attached to the inner wall of the hexagonal hole of the anchoring fork.

5. The blowout prevention blanking plug of pit shaft according to claim 1 or 2, characterized in that the anchoring assembly comprises a lower cone, a tooth block, a pin, a spring holder, a central tube holder, an upper cone, a pin pressing block, a tooth block hole, a left-hand thread joint and an anchoring shifting fork, wherein the outer wall of the central tube holder is provided with a reducing step, the tooth block is provided with a radial tooth block hole, the spring holder is provided with a radial spring holder hole, the tooth block is positioned at the periphery of the spring holder, the spring holder is positioned at the periphery of the central tube holder, after the pin sequentially penetrates the tooth block hole and the radial spring holder hole of the spring holder, the front end of the pin is lapped on the reducing step of the central tube holder, the lower end of the pin pressing block presses the front end of the pin, the upper end of the pin is pressed against the lower end face of the left-hand thread joint, the pin is sleeved with the spring, the inner end of the spring presses, the lower end of the central tube seat is connected with the upper inner wall of a compression seat on a rubber tube of the plugging assembly through a right-handed thread, the lower outer wall of the left-handed joint is connected with the inner wall of an upper cone through a right-handed thread, the outer conical surface of the upper cone corresponds to the upper inner conical surface of the tooth block, the upper outer wall of the compression seat on the rubber tube is connected with the inner wall of a lower cone through the right-handed thread, the outer conical surface of the lower cone corresponds to the lower inner conical surface of the tooth block, and the upper outer wall of the left-handed joint is connected with the lower inner wall of an.

6. The wellbore blowout prevention plug according to claim 5, wherein the anchoring assembly further comprises an extension pipe and a positioning bin, the upper end of the upper cone is in threaded connection with the lower end of the extension pipe, the upper end of the extension pipe is in threaded connection with the positioning bin, and an inner positioning step is formed in the inner wall of the positioning bin.

7. The blowout-preventing packer for the wellbore as claimed in claim 1 or 2, wherein the plugging assembly comprises an upper rubber barrel compression seat, a rubber barrel holder, a lower rubber barrel compression tray, a lower rubber barrel holder positioning seat, a stroke bin and a lower joint, the rubber barrel is sleeved outside the rubber barrel holder, the upper end of the rubber barrel holder is in threaded connection with the lower end of the upper rubber barrel compression seat, the lower end of the rubber barrel holder is in threaded connection with the lower rubber barrel holder positioning seat, a central hole of the lower rubber barrel holder positioning seat is sleeved on the outer wall of the central pull pipe, the lower end face of the rubber barrel abuts against the upper end face of the lower rubber barrel compression tray sleeved outside the rubber barrel holder, the upper end of the stroke bin is in threaded connection with the lower rubber barrel compression tray, the lower end of the stroke bin is in threaded connection with the outer wall of the lower joint, and the inner wall of the upper end.

8. The wellbore blowout prevention plug according to claim 7, wherein the trip bin is provided with a radial pressure relief hole.

9. The wellbore blowout prevention plug according to claim 7, wherein the number of the rubber cylinders is at least two, and the rubber cylinders are separated by a baffle ring.

10. The wellbore blowout prevention plug according to claim 7, wherein the upper end face of the lower connector is provided with a settling tank for receiving settled impurities.

Technical Field

The invention relates to the technical field of well control devices, in particular to a blowout prevention blanking plug for a shaft.

Background

When the operation of disassembling, assembling and replacing a wellhead, a casing pipe nipple and taking and replacing an oil layer casing pipe is implemented under the condition of constructing an empty shaft in the large and small repair of an oil-water well in an oil field, the wellhead is in a non-control state within 1-3 hours, particularly when the operation of taking and replacing the casing pipe is carried out, the non-control state of the wellhead usually reaches more than 10 hours, the potential safety and environmental protection hazards such as great blowout, toxic and harmful gas leakage and the like exist, and meanwhile, the risk of underground falling object accidents also.

At present, because no reliable and efficient special device for blocking the shaft is available, the other processes are adopted to block the empty shaft, so that time is consumed, the operation construction time and workload are greatly increased, and the corresponding cost is also increased for development units. In the process of switching well heads of medium and foreign oil-gas-water wells, well blowout and hydrogen sulfide leakage accidents frequently occur, so that great environmental protection and casualties are caused, great economic benefit loss is brought to oil field development units, and adverse effects are caused in society. Therefore, in order to eliminate the potential risks of construction well control, safety and the like, the device is specially researched and used for quickly and efficiently realizing safe blockage of the shaft under the working condition.

The device is an independent research and development product, and the technical advantages are that: the advancement of structural design components such as reliable anchoring and fixing process technology, reliable lifting and releasing mechanical compression and blockage and the like; the device has the advantages of simple operation, low cost, high efficiency and repeated use. The device is tested on site, the effective plugging time is only about 3 minutes, and the compressive resistance is more than 25 MPa; under the condition that the pressure in the well rises, open flow and extrusion well operation can be realized, and the safety protection device can also be used for the safety protection work of temporary well sealing.

Application No.: 201510352349.6, published japanese unexamined patent application 2015-12-02, discloses a plug and a blowout preventer using the plug. The plug comprises a plug body and a valve rod which is screwed on the plug body, the front end of the valve rod is provided with a valve core, the plug body is provided with a valve seat which is matched with the valve core, and the peripheral surface of the plug body is provided with an external thread which is used for being connected with a threaded hole on a corresponding blowout prevention sleeve; the blanking plug comprises a blanking plug body and is characterized in that a blanking plug mounting stop block and a blanking plug withdrawing stop block are further arranged on the blanking plug body at intervals in the front-back direction, and a driving plate which is in transmission connection with the blanking plug mounting stop block and the blanking plug withdrawing stop block so that the valve rod drives the blanking plug body to rotate is arranged on the valve rod. The blanking plug can conveniently adjust the flow and improve the working efficiency.

Application No.: 201510547958.7, published Japanese patent application 2017-03-08 discloses a single-body limiting type underground blowout prevention sand washing plug, which comprises a valve body, a suspension assembly and a plug assembly, wherein the plug assembly is arranged in an inner cavity of the valve body, the outer wall of the circumference of the upper end of the plug assembly is temporarily connected and fixed with the valve body through a shearing pin, an annular space is formed between the lower half section of the plug assembly and the inner wall of the valve body, and the suspension assembly is arranged at the bottom of the annular space, namely between the plug assembly and the inner wall of the valve body. The invention realizes that the upper pipe column of the tool has no spray overflow under zero pressure, ensures the safe and controlled drilling, and solves the problem that the pipe column cannot be drilled due to spray overflow under pressure when the wellhead is not pressed in the well. And after reaching the designed position, opening the overflowing channel by using hydraulic force and completing the subsequent process constructions such as sand washing, well washing, acidification or sand prevention and the like.

Application No.: 201510701006.6, published 2018-01-05 discloses a blowout prevention blanking plug of a lifting type water distributor for water injection well operation. The problem that the environment is influenced by overflow in the oil outlet pipe during operation and construction of the injection well is mainly solved. The upper part of the upper plugging device body is connected with a rope cap head, and control rods are arranged in central holes of the upper plugging device body and the middle plugging device body; the outer part of the upper part of the stopper is sequentially sleeved with a stopper leather cup, a clamp spring and a spring from top to bottom; the locking mechanism is fixed in the middle body of the plugging device through a pin shaft; the inner part of the lower body of the plugging device is fixed with a one-way shrinkage supporting claw through a pin shaft. The lifting and hanging type water distributor blowout prevention plug for water injection well operation can reduce operation overflow discharge and protect the construction environment from being polluted.

After the patent documents are compared with the present application in detail, the patent documents are different from the present application in terms of specific technical solutions, deep multiple technical problems to be solved, technical effects, and the like, and do not have any technical inspiration.

Disclosure of Invention

The invention aims to provide a shaft blowout prevention plug, which can realize the whole process blowout prevention and downhole falling prevention control in the process of plugging a shaft and removing plugs in the protection of a shaft mouth blowout preventer in the operation process of replacing a shaft mouth, casing pipe nipples and replacing casings.

In order to achieve the purpose, the technical scheme is that the blowout prevention plugging device for the shaft comprises an anchoring assembly, a plugging assembly and an anchor sealing operation assembly, wherein the lower end of the anchoring assembly is connected with the plugging assembly, the anchor sealing operation assembly is inserted into an inner cavity of the anchoring assembly and an inner cavity of the plugging assembly, the anchor sealing operation assembly is in transmission connection with an anchoring shifting fork of the anchoring assembly through a torque tube of the anchor sealing operation assembly, and the anchor sealing operation assembly is connected with a lower joint of the plugging assembly through a central pull tube of the anchor sealing operation assembly.

The anchor sealing operation assembly comprises a central pull tube, a torque tube, a reversing bin, a reversing block, a reversing track seat, a bearing gland, a reversing pull tube and a positioning joint, wherein the upper end of the torque tube is in threaded connection with the reversing bin, the lower end of the torque tube is in threaded connection with the central pull tube, the outer wall of the torque tube is in transmission connection with an anchoring shifting fork, the upper end of the reversing bin is in threaded connection with the outer wall of the reversing track seat, the inner wall of the reversing track seat is provided with the bearing seat, the bearing is arranged on the bearing seat, the upper end port of the reversing track seat is in threaded connection with the bearing gland, the lower end of the bearing gland presses the bearing, the reversing pull rod sequentially penetrates through a central hole of the bearing gland and an inner cavity of the reversing track seat from top to bottom, the lower end of the reversing pull rod enters the reversing bin, the outer wall of the positioning joint is provided with an outer positioning step, and the outer positioning step of the outer wall of the positioning joint corresponds to an inner positioning step arranged on the inner wall of a positioning bin at the upper end of the anchoring assembly.

The outer wall of the reversing block is provided with a convex reversing block torque fin, and the inner wall of the inner cavity of the lower half section of the reversing track seat is provided with a reversing track matched with the shape of the reversing block torque fin.

The torque tube outer wall is the hexagonal face, the anchoring shift fork inner wall of anchoring assembly is the hexagonal hole, and in the torque tube inserted the anchoring shift fork, the six aspect outer walls of torque tube and the laminating of anchoring shift fork hexagonal hole inner wall.

The anchoring assembly comprises a lower cone, a tooth block, a pin, a spring holder, a central tube seat, an upper cone, a pin pressing block, a tooth block hole, a left-hand thread joint and an anchoring shifting fork, wherein the outer wall of the central tube seat is provided with a reducing step, the tooth block is provided with a radial tooth block hole, the spring holder is provided with a radial spring holder hole, the tooth block is positioned at the periphery of the spring holder, the spring holder is positioned at the periphery of the central tube seat, after the pin sequentially penetrates through the tooth block hole and the radial spring holder hole of the spring holder, the front end of the pin is lapped on the reducing step of the central tube seat, the lower end of the pin pressing block presses the front end of the pin, the upper end of the pin presses the lower end face of the left-hand thread joint, the spring is sleeved on the pin, the inner end of the spring presses the spring holder, the outer end of the spring holder presses the inner side face of the tooth block, the, the lower outer wall of the left-hand thread joint is in left-hand thread connection with the inner wall of the upper cone, the outer conical surface of the upper cone corresponds to the upper inner conical surface of the tooth block, the upper outer wall of the compression seat on the rubber cylinder is in left-hand thread connection with the inner wall of the lower cone, the outer conical surface of the lower cone corresponds to the lower inner conical surface of the tooth block, and the upper outer wall of the left-hand thread joint is in right-hand thread connection with the lower inner wall of the anchoring shifting fork.

The anchoring assembly further comprises an extension pipe and a positioning bin, the upper end of the upper cone body is in threaded connection with the lower end of the extension pipe, the upper end of the extension pipe is in threaded connection with the positioning bin, and an inner positioning step is arranged on the inner wall of the positioning bin.

The shutoff assembly includes that the packing element compresses under compression seat, packing element frame, the packing element, compression tray, the packing element frame under positioning seat, stroke storehouse, lower clutch, the packing element suit is outside at the packing element frame, and packing element frame upper end and packing element go up compression seat lower extreme threaded connection, and positioning seat threaded connection under packing element frame lower extreme and the packing element frame, positioning seat centre bore suit are at central trombone slide outer wall under the packing element frame, the terminal surface withstands to compress the tray up end under the packing element of packing element frame outside under the packing element, compression tray threaded connection under stroke storehouse upper end and the packing element, stroke storehouse lower extreme and lower clutch outer wall threaded connection, lower clutch upper end inner wall and central trombone slide lower extreme threaded connection.

The stroke bin is provided with a radial pressure relief hole.

The rubber cylinders are at least two, and every two rubber cylinders are separated by a baffle ring.

And the upper end surface of the lower connector is provided with a settling tank for receiving settled impurities.

Compared with the prior art, the invention has the following beneficial effects:

the shaft blowout prevention plug (WBP) is applied to shaft blockage during the switching of a wellhead and a casing pipe nipple of an oil-water well, and the taking, the replacing and the temporary well plugging, and is a well control device for preventing well blowout construction. When the operation construction needs to change the well mouth operation, the blowout preventer is not required to be removed, the device is directly placed into a shaft through a derrick lifting system, and the shaft is quickly plugged through the rotation of the hydraulic clamp and the lifting compression setting. And after the well mouth and the casing pipe nipple are changed, the well mouth and the blowout preventer are installed, and the blockage relieving operation procedure is implemented. Reliable inner blockage of a shaft is implemented, and blowout is prevented; under the condition of pressure in the well, the operations of relief flow, well killing, pressure measurement and the like can be realized. In a field test, the plugging time of a shaft is less than 120s, the plugging pressure is 25MPa (test pressure is 35 MPa), the anchoring force is more than 300KN, and the plugging releasing time is less than 120 s.

When the operation construction of the invention needs to change the well mouth operation, the blowout preventer is not needed to be removed, the device is directly placed into the shaft through the derrick lifting system, and the shaft is quickly plugged by rotating and lifting the compression setting hydraulic tongs. The blowout accident is prevented.

Drawings

FIG. 1 is a schematic diagram of the construction of a wellbore blowout preventer plug of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a cross-sectional view B-B of FIG. 1;

FIG. 4 is a block diagram of the anchor sealing operation assembly;

FIG. 5 is a block diagram of a commutation track shoe and a commutation block;

FIG. 6 is a bottom view of FIG. 5;

FIG. 7 is a block diagram of the anchoring assembly;

figure 8 is a block diagram of a plugging assembly.

In the figure: the device comprises a central pull tube 1001, a torque tube 1002, a reversing track 1003, a reversing bin 1004, a reversing block 1005, a reversing track seat 1006, a bearing seat 1007, a bearing 1008, a bearing gland 1009, a reversing pull tube 1010 and a positioning joint 1011;

a lower cone 2001, a tooth block 2002, a pin 2003, a spring 2004, a spring holder 2005, a central tube seat 2006, an upper cone 2007, a pin pressing block 2008, a tooth block hole 2009, a back-off thread 2010, a back-off joint 2011, an anchoring fork 2012, an extension tube 2013, a positioning bin 2014 and an inner positioning step 2015;

the rubber cylinder upper compression seat 3001, the rubber cylinder 3002, the rubber cylinder 3003, the rubber cylinder 3004, the baffle ring 3005, the baffle ring 3006, the rubber cylinder frame 3007, the rubber cylinder lower compression tray 3008, the rubber cylinder frame lower positioning seat 3009, the stroke bin 3010, the pressure relief hole 3011, the settling tank 3012 and the lower connector 3013.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 8, the present invention provides a technical solution: the blowout prevention blanking plug for the shaft comprises an anchoring assembly, a plugging assembly and an anchor plugging operation assembly, wherein the lower end of the anchoring assembly is connected with the plugging assembly, the anchor plugging operation assembly is inserted into an inner cavity of the anchoring assembly and an inner cavity of the plugging assembly, the anchor plugging operation assembly is connected with an anchoring shifting fork 2012 of the anchoring assembly in a transmission mode through a torque tube 1002 of the anchor plugging operation assembly, and the anchor plugging operation assembly is connected with a lower joint of the plugging assembly through a central pull tube 1001 of the anchor plugging operation assembly.

The anchor sealing operation assembly comprises a central pull tube 1001, a torque tube 1002, a reversing bin 1004, a reversing block 1005, a reversing track seat 1006, a bearing seat 1007, a bearing 1008, a bearing gland 1009, a reversing pull tube 1010 and a positioning joint 1011, wherein the upper end of the torque tube 1002 is in threaded connection with the reversing bin 1004, the lower end of the torque tube is in threaded connection with the central pull tube 1001, the outer wall of the torque tube 1002 is in transmission connection with an anchoring shifting fork 2012, the upper end of the reversing bin 1004 is in threaded connection with the outer wall of the reversing track seat 1006, the bearing seat 1007 is arranged on the inner wall of the reversing track seat 1006, the bearing is arranged on the bearing seat 1007, the upper end of the reversing track seat 1006 is in threaded connection with the bearing gland 1009, the lower end of the bearing gland 1009 presses the bearing, the reversing pull rod sequentially penetrates through a central hole of the bearing gland 1009 and an inner cavity of the reversing track seat 1006 from top to bottom, the lower end, reversing pull rod upper end and attach fitting 1011 threaded connection, the outer location step is seted up to attach fitting 1011 outer wall, the outer location step of attach fitting 1011 outer wall is corresponding with the interior location step 2015 that the location storehouse 2014 inner wall of anchoring assembly upper end was seted up. The technical field is that two pipe parts are positioned by positioning steps, which belongs to the conventional technology.

The outer wall of the reversing block is provided with a convex reversing block torque fin, and the inner wall of the inner cavity of the lower half section of the reversing track seat 1006 is provided with a reversing track 1003 matched with the shape of the reversing block torque fin.

The outer wall of the torque tube 1002 is a hexagonal surface, the inner wall of an anchoring shifting fork 2012 of the anchoring assembly is a hexagonal hole, the torque tube 1002 is inserted into the anchoring shifting fork 2012, and the outer wall of the hexagonal surface of the torque tube 1002 is attached to the inner wall of the hexagonal hole of the anchoring shifting fork 2012.

The anchoring assembly comprises a lower cone 2001, a tooth block 2002, a pin 2003, a spring holder 2005, a central tube seat 2006, an upper cone 2007, a pin pressing block 2008, a tooth block hole 2009, a left-handed joint 2011 and an anchoring shifting fork 2012, wherein the outer wall of the central tube seat 2006 is provided with a reducing step, the tooth block 2002 is provided with a radial tooth block hole 2009, the spring holder 2005 is provided with a radial spring holder 2005, the tooth block 2002 is positioned at the periphery of the spring holder 2005, the spring holder 2005 is positioned at the periphery of the central tube seat 2006, after the pin 2003 sequentially penetrates through the tooth block hole 2009 and the radial spring holder 2005 of the spring holder 2005, the front end of the pin 2003 is lapped on the reducing step of the central tube seat 2006, the front end of the pin 2003 at the lower end of the pin pressing block 2008 is abutted against the lower end face of the left-handed joint 2011, the spring is sleeved on the pin 2003, the inner end of the spring is abutted against the spring holder 2005, the outer end of the inner side face of the, the lower end of a central tube seat 2006 is in threaded connection with the upper inner wall of a compression seat 3001 on a rubber tube of the plugging assembly through a positive thread, the lower outer wall of a reverse-buckling connector 2011 is in threaded connection with the inner wall of an upper cone 2007 through a reverse thread, the outer conical surface of the upper cone 2007 corresponds to the upper inner conical surface of a tooth block 2002, the upper outer wall of the compression seat 3001 on the rubber tube is in threaded connection with the inner wall of a lower cone 2001 through a reverse thread, the outer conical surface of the lower cone 2001 corresponds to the lower inner conical surface of the tooth block 2002, and the upper outer wall of the reverse-buckling connector 2011 is in threaded connection with the lower inner wall of.

The anchoring assembly further comprises an extension pipe 2013 and a positioning bin 2014, the upper end of the upper cone 2007 is in threaded connection with the lower end of the extension pipe 2013, the upper end of the extension pipe 2013 is in threaded connection with the positioning bin 2014, and an inner positioning step is arranged on the inner wall of the positioning bin 2014.

The shutoff assembly includes compression tray 3001, packing element frame 3007, packing element down compression tray 3008, packing element frame lower positioning seat 3009, stroke storehouse 3010, lower clutch on the packing element frame 3007, packing element suit is in packing element frame 3007 outside, and packing element frame 3007 upper end and packing element on compression tray 3001 lower extreme threaded connection, packing element frame 3007 lower extreme and packing element frame lower positioning seat 3009 threaded connection, and packing element frame lower positioning seat 3009 centre bore suit is at central trombone slide 1001 outer wall, packing element lower terminal surface withstands to compress tray 3008 up end under the packing element of suit in packing element frame 3007 outside, stroke storehouse 3010 upper end and packing element down compression tray 3008 threaded connection, stroke storehouse 3010 lower extreme and lower clutch 3013 outer wall threaded connection, lower clutch upper end inner wall and central trombone slide 1001 lower extreme threaded connection.

The stroke cabin 3010 is provided with a radial pressure relief hole 3011.

The rubber cylinders are at least two, and every two rubber cylinders are separated by a baffle ring.

The upper end face of the lower joint 3013 is provided with a settling tank 3012 for receiving settled impurities.

The invention aims to provide a tool for blocking an empty shaft of an oil-water well, which can realize blowout prevention and control of preventing underground falling objects in the whole process in the protection of a blowout preventer of the shaft mouth in the operation processes of replacing the shaft mouth, casing pipe short sections and replacing casings.

The plugging assembly consists of a lower joint, a stroke cabin 3010, a rubber cylinder frame lower positioning seat 3009, a rubber cylinder frame 3007, a rubber cylinder lower compression tray 3008, a rubber cylinder retaining ring, a rubber cylinder and a rubber cylinder upper compression seat 3001; the anchor sealing operation assembly consists of a central pull tube 1001, a torque tube 1002, a reversing bin 1004, a reversing block 1005, a reversing track seat 1006, a reversing pull tube 1010, a bearing seat 1007, a bearing gland 1009 and a positioning joint 1011; the anchoring assembly consists of a lower cone 2001, a spring frame 2005, a central tube seat 2006, a spring, a pin 2003, a pin pressing block 2008, a tooth block 2002, an upper cone 2007, a left-hand thread joint 2011, an anchoring shifting fork 2012, an extension tube 2013 and a positioning bin 2014. The anchor sealing operation assembly is arranged in cavities of the plugging assembly and the anchoring assembly and is connected with the built-in thread at the upper end of the lower connector through the thread at the lower end of the central pull pipe 1001; the upper compression seat 3001 of the rubber cylinder of the plugging assembly is in threaded connection with the lower cone 2001 of the anchoring assembly.

The lower part of an anchoring assembly consists of a lower cone 2001, a spring frame 2005, a spring, a pin 2003, a pin pressing block 2008, a tooth block 2002, an upper cone 2007, a left-hand thread joint 2011, an anchoring shifting fork 2012, an extension pipe 2013 and a positioning bin 2014; the upper part and the lower part of the central tube seat 2006 are provided with connecting threads, and the middle part of the outer wall is provided with a reducing step; 8 pins 2003 are distributed in the middle of the spring frame 2005, the pins 2003 penetrate through the holes in the 8 tooth blocks 2002, the springs and the spring frame 2005 and are arranged on the reducing steps of the central tube seat 2006, and the pin pressing block 2008 is arranged on the reducing steps of the central tube seat 2006; the upper and lower conical blocks are arranged inside the tooth block 2002 group through threads; the upper part of the central tube seat 2006 is connected with the lower part of the back-off connector 2011 internally provided with threads; the thread is arranged outside the upper part of the left-hand thread connector 2011, and the left-hand thread is arranged outside the lower end of the left-hand thread connector 2011 and is connected with the left-hand thread arranged inside the upper cone 2007; a connecting thread is arranged outside the upper part of the upper cone 2007 and is connected with the inner thread at the lower end of the extension tube 2013; the upper thread of the back-off joint 2011 is connected with the lower end internal thread of the anchoring shifting fork 2012 and is arranged in the extension pipe 2013, and the anchoring shifting fork 2012 is internally provided with a hexagon and is connected with the middle torque pipe 1002 of the anchor sealing assembly to transmit anchoring torque; the external thread at the upper end of the extension pipe 2013 is connected with the internal thread at the lower end of the positioning cabin 2014, and the positioning step is arranged in the upper part of the positioning cabin 2014. When the anchor sealing device is used, the anchor sealing operation assembly rotates, and under the action of friction force provided by the circumferentially distributed tooth blocks 2002, the upper cone 2001 and the lower cone 2001 move oppositely through the left-hand thread until the cone is extruded with the conical surfaces of the tooth blocks 2002, so that firm anchoring is realized.

The lower end thread of a central pull tube 1001 is connected with the internal thread of a lower joint of a plugging assembly, and the upper part of the central pull tube is connected with the internal thread of the lower end of a torque tube 1002; an internal thread is arranged below the torque tube 1002, an external thread is arranged on the torque tube, and the outer surface of the lower part of the torque tube is an external hexagonal torque transmission surface; the lower end of the reversing bin 1004 is provided with an internal thread which is connected with the torque tube 1002, a round bin is arranged in the reversing bin, and the upper end of the round bin is provided with an internal thread; the reversing block is externally provided with a fin-shaped structure, internally provided with threads, arranged inside the reversing bin 1004 and in threaded connection with the lower end of the reversing pull pipe 1010; the lower end of the reversing track seat 1006 is provided with a symmetrical vertical reversing track 1003, the center of the reversing track 1003 is provided with a through hole, the middle part of the lower end is provided with an external thread which is connected with the reversing bin 1004, the upper end of the reversing track seat 1006 is provided with an internal thread, the lower part of the internal thread is provided with a bearing seat 1007, a bearing is arranged on the bearing seat 1007, and the upper end of the bearing seat is connected with the external; the reversing pull tube 1010 is arranged in the inner cavity of the reversing block through an inner hole of the bearing gland 1009, an inner hole of the bearing and a through hole of the reversing track 1003, and the upper end thread is in threaded connection with the lower end of the positioning joint; the lower end of the positioning joint is internally provided with a thread and an external positioning step, and the upper end of the positioning joint is internally provided with an 27/8TBG oil pipe thread. The reversing block 1005 is arranged in the reversing bin 1004, when the positioning joint and the reversing pull tube are rotated, the reversing block is in an idle running state, the reversing block rotates in the reversing bin, when anchoring is implemented, the reversing block 1005 is aligned with the reversing track, then the reversing pull tube is lifted up and enters the reversing track, and then the reversing pull tube is rotated, the reversing pull tube and the reversing block drive the reversing track seat to rotate, the reversing track seat drives the reversing bin to rotate, the reversing bin drives the torque tube to rotate, the torque tube drives the anchoring fork to rotate, the anchoring fork drives the back-off joint to rotate, and so on, the central pull rod and the plugging assembly rotate simultaneously, as the tooth blocks are lapped on the reducing table on the outer wall of the central tube seat through pins, the tooth blocks and the spring frame cannot rotate, as the upper cone and the lower cone are connected through the back-off threads, the upper cone and the lower cone can move oppositely to respectively extrude the upper cone face and the lower cone face of, so that the tooth block is anchored, the inner wall of the upper cone body and the inner wall of the lower cone body slide on the outer wall of the spring frame and keep moving axially. After anchoring is completed, the pipe is lifted up by 20-30KN, the positioning joint is actively rotated by 90 degrees, so that the positioning step outside the positioning joint is placed on the positioning step inside the positioning bin 2014 at the upper end of the anchoring assembly, and axial positioning is completed.

The plugging assembly comprises a lower joint, a stroke cabin 3010, a rubber cylinder frame lower positioning seat 3009, a rubber cylinder frame 3007, a rubber cylinder lower compression tray 3008, a rubber cylinder retaining ring, a rubber cylinder and a rubber cylinder upper compression seat 3001. The lower end of the lower joint is internally provided with an oil pipe internal thread, and the upper end of the lower joint is provided with an internal thread and a grit chamber which are connected with the internal thread at the lower end of the stroke cabin 3010; the upper end and the lower end of the stroke cabin 3010 are respectively provided with an internal thread, and the pipe wall of the lower part is provided with 30111 pressure relief holes; a through hole is formed in the lower positioning seat 3009 of the rubber cylinder frame, and an external thread is formed at the upper end of the lower positioning seat and is connected with an internal thread at the lower end of the rubber cylinder frame 3007; the lower end of the lower compression tray 3008 of the rubber cylinder is provided with an external thread which is connected with the internal thread at the upper end of the stroke cabin 3010; the rubber cylinder frame 3007 is arranged through a rubber cylinder baffle ring and a rubber cylinder inner hole; the lower end of the compression seat 3001 on the rubber cylinder is provided with an external thread which is in threaded connection with the upper end of the rubber cylinder frame 3007, the upper end of the compression seat is provided with an internal thread and an external thread, and the external thread is in threaded connection with the lower cone 2001 of the anchoring assembly. After anchoring is finished, the pipe pulling load is lifted by 20-30KN, the positioning connector is actively rotated by 90 degrees, so that the positioning step outside the positioning connector is arranged on the positioning step inside the positioning bin 2014 at the upper end of the anchoring assembly, axial positioning is finished, and the following functions can be simultaneously finished, under the action of the lifting load of the reversing pipe pulling 1010 and the central pipe pulling 1001, the rubber sleeve lower compression tray 3008 is pulled, the rubber sleeve group outside the rubber sleeve frame 3007 is compressed, and the annular space formed by the shaft sleeve and the rubber sleeve frame 3007 is compressed, so that the plugging function is realized.

The implementation effect and the technical advantages are as follows:

when the operation construction needs to change the well mouth operation, the blowout preventer is not required to be removed, the device is directly placed into a shaft through a derrick lifting system, and the shaft is quickly plugged through the rotation of the hydraulic clamp and the lifting compression setting. And after the well mouth and the casing pipe nipple are changed, the well mouth and the blowout preventer are installed, and the blockage relieving operation procedure is implemented.

The invention has the main functional technical advantages that: reliable inner blockage of a shaft is implemented, and blowout is prevented; under the condition of pressure in the well, the operations of relief flow, well killing, pressure measurement and the like can be realized. In a field test, the plugging time of a shaft is less than 120s, the plugging pressure is 25MPa (test pressure is 35 MPa), the anchoring force is more than 300KN, and the plugging releasing time is less than 120 s.

The device use mode:

opening a wellhead totally-enclosed blowout preventer ram, and placing the device into a preset blocking position in a shaft through a derrick lifting system.

Secondly, the anchoring cones are pushed to move oppositely through the hydraulic clamp forward rotation anchor sealing operation assembly, so that firm anchoring is realized; and if the upper seal anchor operation assembly is not displaced, the anchor is verified to reach the working state.

And thirdly, rotating the anchor sealing operation assembly in a forward rotation manner in a 90-degree direction to enable the positioning joint to be arranged in the positioning bin cavity, and realizing shaft blockage under the action of a lower sealing rubber cylinder. And (4) lowering the anchor sealing operation assembly, taking off the elevator, dismantling the wellhead devices needing to be replaced, such as the blowout preventer and the casing pipe nipple, installing new wellhead devices, and installing the wellhead blowout preventer to complete related operations.

Fourthly, lifting the sealing anchor operation assembly at 250-300 KN, rotating the sealing anchor operation assembly forward at 90 degrees, and lowering the sealing anchor operation assembly to release the sealing rubber cylinder; and (4) reversing the anchor sealing operation assembly for 15 circles, lifting the anchor sealing operation assembly to take out the plugging tool after the anchoring device is released, closing the blowout preventer for full sealing, and completing the operation construction of replacing the wellhead and the casing pipe nipple.

The invention relates to a special tool for preventing accidents such as blowout, toxic and harmful gas leakage and the like in the well repairing process of oil-gas-water well operation. When the operation of replacing the casing pipe nipple, the well mouth and the casing is implemented in the empty well tubular state, the special tool is used for plugging a shaft channel, so that the shaft is safely plugged to prevent blowout and leakage.

In the description of the present invention, it is to be understood that the positional indications or positional relationships are based on those shown in the drawings and are for the purpose of facilitating the description of the present invention, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.