CN207485399U - A kind of annular preventer - Google Patents

Abstract

The utility model discloses an annular blowout preventer, which comprises a first casing, an air bag and an air charging port. In the annular blowout preventer provided by this solution, the gas is used as the power medium to push the air bag to hold the oil pipe tightly, and the gas charging valve fills the space between the first shell and the air bag with gas, and the air bag deforms and holds the oil pipe tightly to realize the gap between the oil pipe and the casing. The sealing of the annular space; when the oil pipe needs to be lifted up for minor repair work, due to the good compressibility of the gas, the oil pipe coupling can squeeze the air bag, and the gas located between the air bag and the first shell is squeezed and deformed, so that the middle of the air bag The space allows the oil pipe coupling to pass directly. Compared with the existing technology, it saves the time of waiting for the opening and closing of the hydraulic ring blowout preventer, thereby shortening the lifting time of the oil pipe for minor repair operations, which also shortens the time for minor repair operations and improves Improve the efficiency of minor repair operations and protect the reservoir in snubbing operations.

Description

An annular blowout preventer

technical field

The utility model relates to the technical field of coal bed gas exploitation, in particular to an annular blowout preventer.

Background technique

Snubbing operation is an operation method in which professional technicians operate special equipment to trip strings in a pressurized environment.

Snubbing equipment includes workbench, lifting system, slip group and blowout preventer group, where the blowout preventer group includes annular blowout preventer and pressure relief/balance spool.

In the prior art, the annular blowout preventer adopts a hydraulic annular blowout preventer. When the oil pipe is lifted in a minor repair operation, the diameter of the oil pipe coupling used to connect the adjacent oil pipes is relatively large, and the hydraulic annular preventer cannot pass through directly. When the oil pipe collar When passing through the hydraulic annulus BOP, the hydraulic annulus BOP used for the passage of the oil pipe coupling needs to be closed to allow the passage of the oil pipe coupling, while other hydraulic annulus BOPs that cooperate with the oil pipe need to be opened In order to ensure the sealing of the annular space between the oil pipe and the casing, through the above-mentioned method of using multiple hydraulic annular BOPs to open and close alternately to realize the passage of the oil pipe coupling, it is necessary to wait for the opening and closing of the hydraulic annulus BOPs, resulting in It takes a long time for the tubing to be lifted up for minor repair operations, which prolongs the time of minor repair operations and reduces the efficiency of minor repair operations. At the same time, due to the water production characteristics of coalbed methane reservoirs, too long workover time will also cause actual well killing and damage. Reservoirs in snubbing operations.

Therefore, how to shorten the time of minor repair operations, improve the efficiency of minor repair operations, and protect reservoirs in snubbing operations has become a technical problem to be solved urgently by those skilled in the art.

Utility model content

In view of this, the utility model provides an annular blowout preventer to shorten the time of minor repair operations, improve the efficiency of minor repair operations, and protect reservoirs in snubbing operations.

In order to achieve the above object, the utility model provides the following technical solutions:

An annular blowout preventer comprising:

first shell;

An airbag, the airbag is arranged in the inner cavity of the first casing and sleeved on the outer wall of the oil pipe, an inflatable cavity is formed between the outer wall of the airbag and the inner wall of the first casing, and the upper end surface of the airbag is in contact with the inner wall of the first casing. The upper end surface of the first housing is fixedly connected, and the lower end surface of the airbag is fixedly connected with the lower end surface of the first housing;

The first casing is provided with an inflation port for inflating the inflation chamber so that the inner wall of the airbag is attached to the oil pipe.

Preferably, in the above-mentioned annular blowout preventer, it also includes:

The rubber core is arranged on the inner wall of the airbag, and the rubber core is sleeved on the outer wall of the oil pipe.

Preferably, in the above-mentioned annular blowout preventer, the upper end surface of the airbag is engaged with the upper end surface of the first casing, and the lower end surface of the airbag is engaged with the lower end surface of the first casing;

Also includes:

a second casing for pressing the upper end surface of the airbag against the upper end surface of the first casing;

A third casing for pressing the lower end surface of the airbag against the lower end surface of the first casing.

Preferably, in the above annular blowout preventer, the upper end surface of the airbag is provided with a first annular protrusion, and the upper end surface of the first housing is provided with a first ring-shaped protrusion that cooperates with the first annular protrusion. An annular groove; the lower end surface of the airbag is provided with a second annular protrusion, and the lower end surface of the first housing is provided with a second annular groove matching the second annular protrusion.

Preferably, in the above-mentioned annular blowout preventer, the upper end of the rubber core and the lower end of the rubber core are both provided with a rubber core skeleton, and the rubber core skeleton at the upper end of the rubber core passes through the second casing The first jacking wire is connected, and the rubber core frame located at the lower end of the rubber core is connected to the third housing through the second jacking wire.

Preferably, in the above-mentioned annular blowout preventer, it also includes:

A fourth housing, the fourth housing is located at the upper end of the second housing, and the fourth housing is provided with an exhaust pipe for leading out bottom-hole exhaust gas;

Sealing rubber, the sealing rubber includes a connection part that fits with the upper end surface of the fourth housing and a sealing part that fits with the outer wall of the oil pipe to prevent exhaust gas from overflowing into the upper end annular space of the connection part, so The sealing part is arranged obliquely relative to the axis of the fourth housing, and the lower end of the sealing part is closer to the axis of the fourth housing than the upper end of the sealing part;

A gland for compressing the sealing rubber.

Preferably, in the above-mentioned annular blowout preventer, the end of the sealing part is an inclined surface, and the upper end of the inclined surface is closer to the axis of the fourth housing than the lower end of the inclined surface.

Preferably, in the above-mentioned annular blowout preventer, a third annular protrusion is provided on the connecting portion, and a third annular recess that cooperates with the third annular protrusion is opened on the fourth housing. groove;

The gland is connected to the fourth housing by bolts;

The fourth housing is positioned with the second housing through pins, and the fourth housing is connected with the second housing through bolts.

Preferably, in the aforementioned annular blowout preventer, the second casing is bolted to the first casing, and the third casing is bolted to the first casing;

A sealing ring is provided between the second housing and the first housing, and a sealing ring is provided between the third housing and the first housing.

Preferably, in the aforementioned annular blowout preventer, the airbag is arranged coaxially with the first casing;

An inflation valve is arranged on the inflation port.

It can be seen from the above technical solutions that the annular blowout preventer provided by the utility model includes a first casing, an air bag and an air charging port. In the annular blowout preventer provided by this solution, the gas is used as the power medium to push the air bag to hold the oil pipe tightly, and the gas charging valve fills the space between the first shell and the air bag with gas, and the air bag deforms and holds the oil pipe tightly to realize the gap between the oil pipe and the casing. The sealing of the annular space; when the oil pipe needs to be lifted up for minor repair work, due to the good compressibility of the gas, the oil pipe coupling can squeeze the air bag, and the gas located between the air bag and the first shell is squeezed and deformed, so that the middle of the air bag The space allows the oil pipe coupling to pass directly. Compared with the existing technology, it saves the time of waiting for the opening and closing of the hydraulic annular blowout preventer, thereby shortening the lifting time of the oil pipe for minor repair operations, which also shortens the time for minor repair operations and improves Improve the efficiency of minor repair operations and protect the reservoir in snubbing operations.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural view of an annular blowout preventer provided by an embodiment of the present invention.

1. Sealing rubber, 2. Exhaust pipe, 3. Pin, 4. First top wire, 5. Rubber core frame, 6. Inflatable valve, 7. Rubber core, 8. Air bag, 9. Third shell, 10 , the first shell, 11, the sealing ring, 12, the second shell, 13, the fourth shell, 14, the bolt, 15, the gland.

Detailed ways

The utility model discloses an annular blowout preventer, which can shorten the time of minor repair operations, improve the efficiency of minor repair operations, and protect reservoirs in snubbing operations.

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Please refer to Fig. 1, Fig. 1 is a schematic structural diagram of the annular blowout preventer provided by the embodiment of the present invention.

The utility model discloses an annular blowout preventer, which comprises a first shell 10, an air bag 8 and an air charging port 6.

The first housing 10 is located on the outermost layer, and the outer wall of the first housing 10 is attached to the inner wall of the casing to protect the internal parts

The airbag 8 is disposed in the inner cavity of the first casing 10 and sleeved on the outer wall of the oil pipe. An inflatable cavity is formed between the outer wall of the airbag 8 and the inner wall of the first casing 10, and the inflatable cavity provides a space for gas supply. The first casing 10 is provided with an inflation port 6 for inflating the inflation chamber so that the inner wall of the airbag 8 is attached to the oil pipe.

In a specific embodiment of this solution, the airbag 8 is in the shape of "I" as a whole.

Gas is injected into the inflation chamber through the inflation port 6, and the gas in the inflation chamber makes the inner wall of the air bag 8 be pressed against the outer wall of the oil pipe to realize the sealing of the annular space between the oil pipe and the casing.

The upper end surface of the airbag 8 is fixedly connected with the upper end surface of the first casing 10, and the lower end surface of the airbag 8 is fixedly connected with the lower end surface of the first casing 10, so as to prevent the airbag 8 from the first casing when the airbag 8 compresses the oil pipe. Body 10 falls off.

In the annular blowout preventer provided by this solution, the gas is used as the power medium for holding the oil pipe tightly, and the gas charging valve 6 fills the space between the first housing 10 and the air bag 8 with gas, and the air bag 8 deforms and holds the oil pipe tightly to realize the oil pipe and casing. The sealing of the annulus between them; when minor maintenance operations need to lift the oil pipe, due to the good compressibility of the gas, the oil pipe coupling of the adjacent oil pipe can squeeze the air bag 8, and the gas located between the air bag 8 and the first shell 10 It is deformed by extrusion, so that the space in the middle of the air bag 8 allows the oil pipe coupling to pass directly. Compared with the prior art, it saves the time of waiting for the opening and closing of the hydraulic annular blowout preventer, thereby shortening the oil pipe lifting time for minor repair operations. The time for minor repair operations is also shortened, and the efficiency of minor repair operations is improved.

The annular blowout preventer provided by this solution also includes a rubber core 7 . The rubber core 7 is disposed on the inner wall of the air bag 8 , and the rubber core 7 is sleeved on the outer wall of the oil pipe.

The annular blowout preventer provided by this solution has a first casing 10, an air bag 8 and a rubber core 7 arranged sequentially from the casing to the oil pipe along the radial direction of the oil pipe, and the rubber core 7 is located in the innermost layer.

In the annular blowout preventer provided by this solution, the gas is used as the power medium to push the rubber core 7 to hold the oil pipe tightly, and the gas filling valve 6 fills the gas filling chamber between the first shell 10 and the air bag 8, and the air bag 8 pushes the rubber core 7 to generate deformation, hold the oil pipe tightly, and realize the sealing of the annular space between the oil pipe and the casing; when the oil pipe needs to be lifted up for minor repair work, due to the good compressibility of the gas, the oil pipe coupling of the adjacent oil pipe can squeeze the rubber core 7, and then The rubber core 7 squeezes the air bag 8, and the gas located between the air bag 8 and the first housing 10 is deformed by the extrusion, so that the space of the rubber core 7 allows the oil pipe coupling to pass directly, which saves the waiting hydraulic pressure compared to the prior art. The opening and closing time of the annular blowout preventer shortens the tubing lifting time for minor repair operations, shortens the time for minor repair operations, improves the efficiency of minor repair operations, and protects the reservoir in snubbing operations.

The design of the rubber core 7 enhances the wear resistance and high service strength of the annular blowout preventer, and prolongs the service life of the annular blowout preventer to a certain extent.

In the annular blowout preventer provided by this solution, the first casing 10 and the air bag 8 form a pneumatic tire, which provides elastic support for the rubber core 7 along the radial direction of the oil pipe, improves the sealing performance of the annular blowout preventer, and the air tire is relatively Due to the high elasticity of the solid elastic parts and hydraulic elastic parts, the problem of serious wear when the oil pipe coupling passes through is solved, and the service life of the annular blowout preventer is prolonged.

When the gas pressure between the first shell 10 of the annular BOP and the air bag 8 is too high, a certain amount of gas can be discharged outward through the gas charging port 6 to meet the requirements for tightness of the oil pipe or lifting of the oil pipe collar . In a specific embodiment of this solution, the inflation port 6 is opened on the side wall of the first housing 10 .

The pressurization and depressurization speed of the annular blowout preventer provided by this scheme is fast, which further improves the efficiency of minor repair operations.

Compared with the hydraulic annular blowout preventer, the cost of the annular blowout preventer provided by the proposal is simple in structure and low in cost.

The upper end surface of the airbag 8 is clamped with the upper end surface of the first housing 10, and the lower end surface of the airbag 8 is clamped with the lower end surface of the first housing 10. The clamping connection method can reduce the airbag 8 and the first housing 10. Difficulty in connection, while facilitating the installation and replacement of the airbag 8.

In order to achieve stable fixation of the airbag 8 , the annular blowout preventer provided by this solution further includes a second shell 12 and a third shell 9 .

The second housing 12 is used to compress the upper end surface of the airbag 8 to the upper end surface of the first housing 10 , and the third housing 9 is used to compress the lower end surface of the airbag 8 to the lower end surface of the first housing 10 .

The compression of the upper end surface and the lower end surface of the airbag 8 is realized by the second housing 12 and the third housing 9, which increases the compression area of the upper end surface and the lower end surface of the airbag 8. This compression method can not only The compression effect on the airbag 8 is ensured, the damage to the airbag 8 can be reduced, and the service life of the airbag 8 can be prolonged.

The clamping structure of the airbag 8 and the second housing 12 and the third housing 9 is as follows:

The upper end surface of the airbag 8 is provided with a first annular protrusion, and the upper end surface of the first shell 10 is provided with a first annular groove matching the first annular protrusion.

The lower end surface of the airbag 8 is provided with a second annular protrusion, and the lower end surface of the first housing 10 is provided with a second annular groove matching the second annular protrusion.

The first annular protrusion on the upper end surface of the airbag 8 is engaged in the first annular groove, and the second annular protrusion on the upper end surface of the airbag 8 is engaged in the second annular groove. The airbag 8 is compressed by the second housing 12 and the third housing 9 , which ensures the compression effect on the airbag 8 .

In order to further optimize the above-mentioned technical scheme, in a specific embodiment of this scheme, the upper end of the rubber core 7 and the lower end of the rubber core 7 are provided with a rubber core skeleton 5, and the rubber core skeleton 5 can strengthen the connection between the upper end and the lower end of the rubber core 7. Strength, prolong the service life of rubber core 7.

In a specific embodiment of this scheme, the upper end of the rubber core 7 extends to the inner wall of the second housing 12, and the lower end of the rubber core 7 extends to the inner wall of the third housing 9, that is, the length of the rubber core 7 extends from the second housing The body 12 starts extending through the first housing 10 to the third housing 9 .

The rubber core frame 5 at the upper end of the rubber core 7 is connected to the second housing 12 through the first jacking wire 4 , and the rubber core frame 5 at the lower end of the rubber core 7 is connected to the third housing 9 through the second jacking wire. The connection between the rubber core 7 and the rubber core skeleton 5 is realized through the first jacking wire 4 and the second jacking wire, which can facilitate the installation and disassembly of the rubber core 7 and reduce interference with other parts.

The annular blowout preventer provided by this solution also includes a fourth casing 13 , a sealing rubber 1 and a gland 15 . The fourth casing 13, the sealing rubber 1 and the gland 15 form an overflow gas recovery system to ensure operation safety.

The fourth casing 13 is located at the upper end of the second casing 12, and the fourth casing 13 is provided with an exhaust pipe 2 for leading out the exhaust gas at the bottom of the well.

The sealing rubber 1 includes a connection part that fits with the upper end surface of the fourth housing 13 and a sealing part that fits with the outer wall of the oil pipe to prevent exhaust gas from overflowing into the upper end annular space of the connection part. The axis is arranged obliquely, and the lower end of the sealing portion is closer to the axis of the fourth housing 13 than the upper end of the sealing portion.

The gland 15 is used to compress the sealing rubber 1 .

The sealing part of the sealing rubber 1 is arranged obliquely, and a space for containing exhaust gas is formed between the outer wall of the sealing part and the inner wall of the fourth housing 13. When the exhaust gas at the lower part of the sealing part enters the space between the rubber core 7 and the oil pipe, the exhaust gas It will enter the space for containing the exhaust gas between the sealing part and the fourth housing 13. At this time, the exhaust gas will push the sealing part to further compress the oil pipe, preventing the exhaust gas from entering the annular space on the upper part of the annular blowout preventer, and ensuring the operation and installation.

When the space for containing waste gas is filled with waste gas at the bottom of the well, the waste gas is discharged to the waste gas recovery device outside the well through the exhaust pipe 2 of the fourth housing 13 to ensure the safety of the well site and personnel during operation.

The gland 15 is used to press the sealing rubber 1 onto the fourth housing 13 to ensure effective pressing of the sealing rubber 1 and thus ensure the safety of the operation.

In order to prevent the sealing rubber 1 from affecting the lifting and lowering operation of the oil pipe, the end of the sealing part is an inclined surface, and the upper end of the inclined surface is closer to the axis of the fourth housing 13 than the lower end of the inclined surface. The inclined surface at the end of the sealing part can guide the lifting and lowering of the oil pipe, and can ensure the tight fit between the end of the sealing part and the oil pipe when the sealing part is squeezed by exhaust gas.

The sealing rubber 1 and the fourth housing 13 adopt a clamping connection form, as follows:

A third annular protrusion is provided on the connecting portion, and a third annular groove matching the third annular protrusion is formed on the fourth housing 13 . The third annular protrusion is snapped into the third annular groove, and the gland 15 realizes the compression of the snap-in structure.

In order to facilitate the installation of the gland 15 and the fourth casing 13 , the gland 15 is bolted to the fourth casing 13 , or the gland 15 is screwed to the fourth casing 13 .

In a specific embodiment of this solution, the fourth housing 13 and the second housing 12 are positioned by pins 3 , and the fourth housing 13 and the second housing 12 are connected by bolts 14 .

The second shell 12 is bolted to the first shell 10, and the third shell 9 is bolted to the first shell 10, realizing the detachability of the second shell 12 and the third shell 9 from the first shell 10 connection to facilitate subsequent maintenance.

In order to ensure the sealing performance of the annular blowout preventer, a sealing ring 11 is provided between the second housing 12 and the first housing 10 , and a sealing ring 11 is provided between the third housing 9 and the first housing 10 . The sealing ring 11 between the second housing 12 and the first housing 10 is pressed against the second housing 12 through the second housing 12, and the sealing ring 11 between the third housing 9 and the first housing 10 is passed through the second housing 12. Three casings 9 are compressed.

The above description of the disclosed embodiments enables those skilled in the art to realize or use the utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. An annular blowout preventer, characterized in that, comprising: a first housing (10); An airbag (8), the airbag (8) is arranged in the inner cavity of the first casing (10) and sleeved on the outer wall of the oil pipe, the outer wall of the airbag (8) and the first casing (10) An inflatable cavity is formed between the inner walls of the airbag (8), the upper end surface of the airbag (8) is fixedly connected with the upper end surface of the first housing (10), and the lower end surface of the airbag (8) is connected with the first housing ( 10) The lower end face is fixedly connected; The first casing (10) is provided with an inflation port (6) for inflating the inflation chamber to make the air bag (8) and the oil pipe stick together. 2. The annular blowout preventer according to claim 1, further comprising: The rubber core (7) is arranged on the inner wall of the air bag (8), and the rubber core (7) is sheathed on the outer wall of the oil pipe. 3. The annular blowout preventer according to claim 2, characterized in that, the upper end surface of the airbag (8) is engaged with the upper end surface of the first casing (10), and the upper end surface of the airbag (8) The lower end surface is engaged with the lower end surface of the first housing (10); Also includes: A second housing (12) for pressing the upper end surface of the airbag (8) against the upper end surface of the first housing (10); The third casing (9) is used to press the lower end surface of the airbag (8) against the lower end surface of the first casing (10). 4. The annular blowout preventer according to claim 3, characterized in that, the upper end surface of the air bag (8) is provided with a first annular protrusion, and the upper end surface of the first housing (10) is provided with a A first annular groove cooperating with the first annular protrusion; the lower end surface of the airbag (8) is provided with a second annular protrusion, and the lower end surface of the first housing (10) is provided with A second annular groove cooperating with the second annular protrusion. 5. The annular blowout preventer according to claim 3, characterized in that, the upper end of the rubber core (7) and the lower end of the rubber core (7) are provided with a rubber core skeleton (5), located at the The rubber core skeleton (5) at the upper end of the rubber core (7) is connected to the second housing (12) through the first top wire (4), and the rubber core skeleton (5) at the lower end of the rubber core (7) ) is connected with the third casing (9) through a second jacking wire. 6. The annular blowout preventer according to claim 3, further comprising: The fourth housing (13), the fourth housing (13) is located at the upper end of the second housing (12), and the fourth housing (13) is provided with an exhaust port for leading out bottom-hole waste gas tube(2); Sealing rubber (1), the sealing rubber (1) includes a connection part that fits with the upper end surface of the fourth housing (13) and fits with the outer wall of the oil pipe to prevent exhaust gas from overflowing to the connection part The sealing part of the upper end of the annulus, the sealing part is arranged obliquely relative to the axis of the fourth casing (13), and the lower end of the sealing part is closer to the fourth casing (13) than the upper end of the sealing part ) axis; A gland (15) for compressing the sealing rubber (1). 7. The annular blowout preventer according to claim 6, characterized in that, the end of the sealing part is an inclined surface, and the upper end of the inclined surface is closer to the fourth casing (13) than the lower end of the inclined surface axis. 8. The annular blowout preventer according to claim 6, characterized in that, the connecting portion is provided with a third annular protrusion, and the fourth housing (13) is provided with a The third annular groove matched with the shaped protrusion; The gland (15) is bolted to the fourth housing (13); The fourth housing (13) and the second housing (12) are positioned by pins (3), and the fourth housing (13) and the second housing (12) are positioned by bolts (14) connect. 9. The annular blowout preventer according to claim 3, characterized in that, the second housing (12) is bolted to the first housing (10), and the third housing (9) is connected to The first housing (10) is bolted; A sealing ring (11) is arranged between the second casing (12) and the first casing (10), and a sealing ring (11) is arranged between the third casing (9) and the first casing (10). The sealing ring (11) is provided. 10. The annular blowout preventer according to claim 1, characterized in that, the air bag (8) is coaxially arranged with the first housing (10); An inflation valve is arranged on the inflation port (6).