阅读说明：本技术 一种油田井口环形防喷器 (Annular blowout preventer of oil field wellhead ) 是由 张化庆 郭英健 丛日东 杨凤凯 姚炳龙 孙庆伟 周敏杰 于国江 李晶 于 2019-09-26 设计创作，主要内容包括：本发明涉及防护设备技术领域,且公开了一种油田井口环形防喷器,包括壳体,所述壳体内腔的中部固定套接有支承筒,所述壳体的内部开设有活动腔,所述活动腔内活动套接有活塞,所述壳体两个侧面的底端均开设有排气孔,所述排气孔与活动腔的底面相连通。本发明通过利用卡销与锁扣对应卡接的方式,利用在顶盖的顶面通过转轴活动连接卡销,在壳体的侧面活动套接锁扣,在卡销上的锁孔活动套接在锁扣上之后,旋动锁扣使其的控制端为水平状态,此时卡销上的锁孔无法通过锁扣的控制端,从而将卡销与锁扣卡接,而在实际操作中,将顶盖与壳体合并后,只需将卡销与锁扣进行卡接,即可达到将顶盖与壳体连接的目的。(The invention relates to the technical field of protective equipment and discloses an annular blowout preventer for an oilfield wellhead, which comprises a shell, wherein a supporting cylinder is fixedly sleeved in the middle of an inner cavity of the shell, a movable cavity is formed in the shell, a piston is movably sleeved in the movable cavity, exhaust holes are formed in the bottom ends of two side surfaces of the shell, and the exhaust holes are communicated with the bottom surface of the movable cavity. The top cover is movably connected with the bayonet lock through the rotating shaft by utilizing the mode that the bayonet lock is correspondingly clamped with the lock catch, the lock catch is movably sleeved on the side surface of the shell, the lock hole on the bayonet lock is movably sleeved on the lock catch, the lock catch is rotated to enable the control end of the lock catch to be in a horizontal state, at the moment, the lock hole on the bayonet lock cannot pass through the control end of the lock catch, so that the bayonet lock is clamped with the lock catch, and in the actual operation, after the top cover is combined with the shell, the purpose of connecting the top cover with the shell can be achieved only by clamping the bayonet lock with the lock catch.)

1. An oil field well head annular preventer, includes casing (1), its characterized in that: a supporting cylinder (11) is fixedly sleeved at the middle part of an inner cavity of the shell (1), a movable cavity (17) is formed in the shell (1), a piston (2) is movably sleeved in the movable cavity (17), exhaust holes (10) are formed in the bottom ends of two side surfaces of the shell (1), the exhaust holes (10) are communicated with the bottom surface of the movable cavity (17), bolt holes (3) are formed in the top surfaces of the two side surfaces of the shell (1), a dust ring (4) is fixedly sleeved at the top part of the inner cavity of the shell (1), a clamping cover (6) is fixedly connected to the side surface of the top end of the shell (1), a clamping cavity (15) is formed in the clamping cover (6), a top cover (5) is movably sleeved in the clamping cavity (15), a top cavity (9) is formed in the top cover (5), and a rubber core (7) is movably sleeved in the top cavity (9), the top surface of rubber core (7) just is located inside fixedly connected with rubber (8) of top chamber (9), fixedly connected with pivot (14) on the right half of top cap (5) top surface, bayonet lock (13) have been cup jointed in the activity on pivot (14), hasp (12) have been cup jointed in the activity on the right half of casing (1) surface, lockhole (16) have been seted up to the bottom of bayonet lock (13).

2. The annular blowout preventer of an oilfield wellhead according to claim 1, wherein: the top surface of the top cover (5) is provided with a through hole, and the bottom surface of the top cover (5) is movably connected with the shell (1) through a dust ring (4).

3. The annular blowout preventer of an oilfield wellhead according to claim 1, wherein: the shape of card lid (6) is semi-circular, the diameter value of card lid (6) is equal with the diameter value of casing (1).

4. The annular blowout preventer of an oilfield wellhead according to claim 1, wherein: the number of the rubbers (8) is eight, and the eight rubbers (8) are uniformly distributed on the top surface of the rubber core (7).

5. The annular blowout preventer of an oilfield wellhead according to claim 1, wherein: the quantity of hasp (12) is three, and the control end of three hasp (12) is rectangular form, and is three hasp (12) evenly distributed is in the right half of top cap (5).

6. The annular blowout preventer of an oilfield wellhead according to claim 1, wherein: the quantity of bayonet lock (13) is the same with the quantity of hasp (12), bayonet lock (13) is the joint with the relation of hasp (12).

7. The annular blowout preventer of an oilfield wellhead according to claim 1, wherein: the clamping cavity (15) is tightly attached to the bottom of the top cover (5), and a sealing ring is arranged in the clamping cavity (15).

8. The annular blowout preventer of an oilfield wellhead according to claim 1, wherein: the width value of the lock hole (16) is larger than that of the control end of the lock catch (12), the width value of the lock hole (16) is smaller than that of the control end of the lock catch (12), and the lock hole (16) is movably sleeved with the lock catch (12).

9. The annular blowout preventer of an oilfield wellhead according to claim 1, wherein: the width value of the movable cavity (17) is slightly larger than that of the piston (2), and lubricating oil is coated in the movable cavity (17).

Technical Field

The invention relates to the technical field of protective equipment, in particular to an annular blowout preventer of an oil field wellhead.

Background

The annular blowout preventer is usually provided with a large gate of a gate plate type blowout preventer, a sealed annular space can be formed between a pipe column and a shaft during operation, the sealing can be independently completed under the condition that the pipe column is not arranged in a well, but the annular blowout preventer can not be used for several times and does not allow long well closing.

In practical application, because of the increase of the cycle times of opening and closing the rubber core and the continuation of time, the rubber can generate fatigue cracks, corrosion and aging phenomena, the resilience force of the rubber core is gradually weakened, the sealing effect is poor, the sealing requirement cannot be met, at the moment, the rubber core needs to be replaced, when the rubber core is replaced, a common method is to separate a top cover from a shell, the rubber core is replaced from the upper part of the blowout preventer, at the moment, bolts connected with the top cover and the shell need to be detached, because the number of the bolts is large, a large amount of time needs to be wasted during detachment, the speed of replacing the rubber core is slow, in addition, after the blowout preventer is closed and opened, the airtightness and the lubricity of the rubber core of the blowout preventer need to be maintained and detected, and because the number of the detached bolts is large, the manual labor intensity is high, and the popularization is not facilitated, an annular blowout preventer for an oilfield wellhead has been proposed.

Disclosure of Invention

The invention provides an annular blowout preventer of an oil field wellhead, which has the advantages of conveniently replacing a rubber core and detecting, saving time and labor force and solves the problems in the background technology.

The invention provides the following technical scheme: an oil field well mouth annular blowout preventer comprises a shell, wherein a supporting cylinder is fixedly sleeved at the middle part of an inner cavity of the shell, a movable cavity is formed in the shell, a piston is movably sleeved in the movable cavity, exhaust holes are formed in the bottom ends of two side surfaces of the shell and communicated with the bottom surface of the movable cavity, bolt holes are formed in the top surfaces of the two side surfaces of the shell, a dust ring is fixedly sleeved at the top part of the inner cavity of the shell, a clamping cover is fixedly connected to the side surface of the top end of the shell, a clamping cavity is formed in the clamping cover, a top cover is movably sleeved in the clamping cavity, a top cavity is formed in the top cover, a rubber core is movably sleeved in the top cavity, rubber is fixedly connected to the top surface of the rubber core and is positioned in the top cavity, a rotating shaft is fixedly connected to the right half part of the top surface of the top, the lock catch is movably sleeved on the right half part of the outer surface of the shell, and the bottom end of the clamping pin is provided with a locking hole.

The top surface of the top cover is provided with a through hole, and the bottom surface of the top cover is movably connected with the shell through a dust ring.

The shape of the clamping cover is semicircular, and the diameter value of the clamping cover is equal to that of the shell.

Carefully selecting, the quantity of the rubber is eight, and eight rubbers are evenly distributed on the top surface of the rubber core.

Carefully, the quantity of hasp is three, and the control end of three hasp is rectangular form, and is three hasp evenly distributed is in the right half of top cap.

The carefully chosen bayonet locks are the same in number as the lock catches, and the bayonet locks are clamped with the lock catches.

Carefully selecting, the card chamber closely laminates with the bottom of top cap, be equipped with the sealing washer in the card chamber.

The lock hole is selected, the width value of the lock hole is larger than that of the lock catch control end, the width value of the lock hole is smaller than that of the lock catch control end, and the lock hole is movably sleeved with the lock catch.

And (2) selecting, wherein the width value of the movable cavity is slightly larger than that of the piston, and lubricating oil is coated in the movable cavity.

The invention has the following beneficial effects:

1. according to the invention, the bayonet lock is movably connected to the top surface of the top cover through the rotating shaft by utilizing the mode that the bayonet lock is correspondingly clamped with the lock catch, the lock catch is movably sleeved on the side surface of the shell, after the lock hole on the bayonet lock is movably sleeved on the lock catch, the lock catch is rotated to enable the control end of the lock catch to be in a horizontal state, at the moment, the lock hole on the bayonet lock cannot pass through the control end of the lock catch, so that the bayonet lock is clamped with the lock catch, in the practical operation, after the top cover is combined with the shell, the aim of connecting the top cover with the shell can be achieved by clamping the bayonet lock with the lock catch, a worker can conveniently take the top cover down from the shell to detect the sealing property and the lubricating property of the rubber core in the blowout preventer, so.

2. According to the invention, the clamping cover is connected to the side surface of the top of the shell in a manner of clamping the left half part of the top cover on the shell, the size of the inner cavity of the clamping cover is the same as that of the bottom surface of the top cover, the half part of the top cover is clamped by the inner cavity of the clamping cover, and the top cover and the right half part of the shell are clamped by the clamping action of the clamping pin and the lock catch.

3. The invention improves the problems of rubber core replacement without a drilling tool in the blowout preventer and blowout preventer maintenance, facilitates the operation and maintenance of workers, improves the sealing performance of the blowout preventer, saves labor force when replacing the rubber core, has strong adaptability and is suitable for popularization.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a side view of the structure of the present invention;

FIG. 3 is a side view of the structural shell of the present invention;

FIG. 4 is a top view of the structure of the present invention;

FIG. 5 is a schematic view of the bayonet of the present invention.

In the figure: 1. a housing; 2. a piston; 3. bolt holes; 4. a dust ring; 5. a top cover; 6. a cover is clamped; 7. a rubber core; 8. rubber; 9. a top chamber; 10. an exhaust hole; 11. a support cylinder; 12. locking; 13. a bayonet lock; 14. a rotating shaft; 15. a card cavity; 16. a lock hole; 17. a movable cavity.

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. 1-5, an annular blowout preventer for an oil field wellhead comprises a housing 1, a supporting cylinder 11 is fixedly sleeved in the middle of an inner cavity of the housing 1, a movable cavity 17 is formed in the housing 1, the width of the movable cavity 17 is slightly larger than that of a piston 2, lubricating oil is coated in the movable cavity 17, the size of the movable cavity 17 is set so that the piston 2 can move up and down in the movable cavity 17, the lubricating oil is also set so as to reduce resistance of the piston 2 during movement and reduce corrosion of the device, the service life of the device is prolonged, the piston 2 is movably sleeved in the movable cavity 17, exhaust holes 10 are formed in the bottom ends of two side surfaces of the housing 1, the exhaust holes 10 are communicated with the bottom surface of the movable cavity 17, the exhaust holes 10 are convenient for exhausting gas in the movable cavity 17, bolt holes 3 are formed in the top surfaces of the two side surfaces of the housing 1, a dust ring 4 is fixedly sleeved on the top, the side surface of the top end of the shell 1 is fixedly connected with a clamping cover 6, the clamping cover 6 is semicircular, the diameter value of the clamping cover 6 is equal to that of the shell 1, a clamping cavity 15 is formed in the clamping cover 6, the clamping cavity 15 is tightly attached to the bottom of the top cover 5, a sealing ring is arranged in the clamping cavity 15, the bottom surface of the top cover 5 can be completely clamped into the clamping cavity 15 by setting the diameter value of the clamping cover 6 and the size of the clamping cavity 15, the top cover 5 cannot move in the clamping cavity 15, the problem that the top cover 5 moves randomly to cause untight structure air tightness is solved, the stability of the structure is reflected, the sealing ring is arranged to improve the sealing property, the top cover 5 is movably sleeved in the clamping cavity 15, a through hole is formed in the top surface of the top cover 5, the bottom surface of the top cover 5 is movably connected with the shell 1 through a dust ring 4 and is formed in the through hole, a drilling tool through hole can pass through the blowout preventer, and the, the airtightness of the device is improved, the practicability of the structure is embodied, a top cavity 9 is formed in a top cover 5, a rubber core 7 is movably sleeved in the top cavity 9, the top surface of the rubber core 7 and the inside of the top cavity 9 are fixedly connected with rubber 8, the number of the rubber 8 is eight, the eight rubber 8 is uniformly distributed on the top surface of the rubber core 7, under the action of hydraulic pressure, a piston 2 can push the rubber core 7 to contract inwards, the rubber core 7 can continue to contract due to the fact that no drilling tool exists in a well at the moment, the rubber 8 can fill a cavity in the rubber core 7 at the moment, the well sealing effect is realized, rubber is arranged, the sealing performance is improved, a rotating shaft 14 is fixedly connected to the right half part of the top surface of the top cover 5, bayonet pins 13 are movably sleeved on the rotating shaft 14, the number of the bayonet pins 13 is the same as that of the lock catches 12, the bayonet 13 is in clamping connection with the lock catches 12, the bayonet pins, the lock catch 12 is movably sleeved on the side face of the shell 1, in actual operation, after the top cover 5 and the shell 1 are combined, the aim of connecting the top cover 5 and the shell 1 can be achieved only by clamping the lock catch 13 with the lock catch 12, workers can conveniently take the top cover 5 off the shell 1 to detect the sealing property and the lubricating property of the rubber core 7 in the blowout preventer, the labor force of the workers is saved, the detection is convenient, the sealing property of the blowout preventer is improved, the lock catch 12 is movably sleeved on the right half part of the outer surface of the shell 1, the number of the lock catch 12 is three, the control ends of the three lock catches 12 are all in a long strip shape, the three lock catches 12 are uniformly distributed on the right half part of the top cover 5, the half part of the top cover 5 is clamped and connected by the inner cavity of the clamp cover 6, the right half part of the top cover 5 and the right half part of the shell 1 are clamped by the clamping action of the lock catch, the rubber core 7 is conveniently replaced by separating the top cover 5 from the shell 1 only by separating the joint of the top cover 5 and the right half part of the shell 1 and transversely drawing out the top cover 5, the rubber core 7 is replaced by separating the top cover 5 from the shell 1, the replacement efficiency of the rubber core 7 is improved, time is saved, the occurrence probability of accidents caused by long-time maintenance is reduced, the personal safety is guaranteed, the bottom end of the bayonet lock 13 is provided with a lock hole 16, the width value of the lock hole 16 is larger than that of the control end of the lock catch 12, the width value of the lock hole 16 is smaller than that of the control end of the lock catch 12, the relation between the lock hole 16 and the lock catch 12 is in movable sleeve joint, so that the lock hole 16 can pass through the control end of the lock catch 12, after the lock hole 16 on the bayonet lock 12 is movably sleeved on the lock catch 12, the control end of the lock catch 12 is in a horizontal state, at, the rationality of the structure is reflected.

The working principle is as follows: when the blowout preventer is used, in the normal use process of the blowout preventer, pressure oil from a hydraulic control system enters a lower oil cavity to push the piston 2 to move upwards rapidly, the rubber core 7 cannot move upwards under the limitation of the top cover 5, the rubber core 7 is forced to be extruded and contracted towards the center under the action of an inner conical surface of the piston 2, in the contraction process of the rubber core 7, the rubber 8 is gradually filled in the middle of the rubber core 7 and moves continuously until the rubber 8 is filled in the middle of the rubber core 7, so that a wellhead is completely sealed, when the rubber core 7 needs to be detected, the control end of the lock catch 12 is firstly rotated to be in a vertical state, the lock hole 16 can pass through the lock catch 12, so that the clamp pin 13 is separated from the lock catch 12, in this way, after the three clamp pins 13 are separated from the lock catch 12, the top cover 5 is transversely moved towards the opening direction of the clamp cover 6, the bottom surface of the top cover 5 is gradually separated from the clamp cavity, detect leakproofness and the lubricity of gluey core 7, if gluey core 7 goes wrong, then change the processing to gluey core 7, after the change is accomplished, put into top cap 5 from the opening direction of card lid 6 gradually, impel again, go into in card chamber 15 until the bottom of top cap 5 is blocked completely, then the control end of lockhole 16 through hasp 12 on with bayonet lock 13 through the effect of pivot 14, after lockhole 16 passes through hasp 12, the control end of rotating hasp 12, the control end of up to hasp 12 is the horizontality, accomplish bayonet lock 13 and hasp 12's joint this moment, be connected with this mode, realize the change and the detection to gluey core 7.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Meanwhile, in the drawings of the invention, the filling pattern is only used for distinguishing the layers and is not limited at all.

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.