Slip type gas well throttler

Abstract

The utility model discloses a slip type gas well throttler which comprises a one-way anchoring module, a compression sealing module, a one-way locking module and a sand prevention filtering module. When the one-way anchoring module is designed to bear the high pressure at the lower part, the high pressure can help the one-way locking module to further lock in the forward direction and strengthen the locking function, and the locking mechanism is not subjected to shear damage, so that the high pressure bearing capability is stronger; the main sealing element is designed in an underneath mode, lower high pressure is used for promoting further forward compression of the main sealing element, the sealing performance can be maintained for a long time, and therefore the device is more suitable for pressure control of a lower abnormally-high-pressure gas well. When the main sealing element bears lower high pressure, the main sealing element does not rush into an annular gap between the tool and an oil pipe to block the throttler, so that the throttler cannot be blocked and failed to salvage, and the underground condition is complicated; the sand prevention filtering module filters out solid stratum sand with the particle size larger than a design value, so that oil pipes and other tools along which airflow passes are prevented from being abraded by high-speed solid particles, and the service life of the tools is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of throttling mining tools for controlling the pressure of a gas wellbore, in particular to a slip type gas well throttler. Background Art

[0002] At present, gas fields commonly use wellhead gas nozzle tools and ordinary downhole throttles to control the high pressure inside the wellbore. Due to the inherent reasons of this process, it has the following functional defects: during the flow of formation sand with high-velocity gas, it must pass through the oil pipe and reach the wellhead. The high-velocity formation sand causes abrasion to the oil pipe and gas nozzle along the way, resulting in damage to the oil pipe, a short life of the gas nozzle, and in severe cases, sand blockage of the oil pipe; ordinary downhole throttles do not have a seal anti-blowout design. When under high pressure, the seal is pressed into the annular gap between the tool and the oil pipe, causing the throttle to get stuck. When it is salvaged and unsealed, it gets stuck, which complicates the downhole situation; when sand gets stuck and the well needs to be washed, the gas nozzle cannot penetrate and a large-flow well washing channel cannot be established. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, the utility model provides a cava-type gas well throttle. When the one-way anchoring module is designed to be placed on top and is subjected to the lower high pressure, the high pressure can help the one-way locking module to further lock forward, thereby strengthening the locking function and causing no shear damage to the locking mechanism. Therefore, the utility model has a stronger ability to withstand the lower high pressure. The main seal is designed to be placed at the bottom and utilizes the lower high pressure to promote further positive compression of the main seal. The anti-burst function design of the main seal prevents the main seal from being damaged when subjected to the lower high pressure, and the sealing performance can be maintained for a long time. Therefore, the utility model is more suitable for the pressure control of the abnormally high-pressure gas well at the bottom. When the main seal is subjected to the lower high pressure, it will not advance into the annular gap between the tool and the oil pipe to jam the throttle, causing the salvage throttle to fail and complicating the downhole situation. The anti-sand filtering module filters out solid formation sand with a particle size larger than the design value, thereby protecting the oil pipe and other tools along the airflow of the tool from high-speed solid particle abrasion and extending its service life.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions: a cava type gas well throttle, including a one-way anchoring module, a compression sealing module, a one-way locking module, and a sand prevention filtering module. The one-way anchoring module is composed of a cap, a cava seat, a cava body, and a cone. The cap is threadedly connected to the cava seat. A single quenching tooth is provided on the outer surface of the cava body. The cava body is hung below the cava seat through a T-slot. The lower end of the cava body is stuck in the dovetail groove of the cone. The compression sealing module is composed of a connecting head, a shear pin, a center rod, a hand-release joint, an anti-burst umbrella, a supporting cone, a rubber cylinder body, a spacer ring, a rubber cylinder seat, a gas nozzle body, and a polytetrafluoroethylene gasket. The upper end of the hand-release joint is hung with the connecting head through a shear pin. The lower end of the release joint is threadedly connected to the center rod, and the inner cavity of the lower end of the center rod is equipped with a gas nozzle body, the anti-burst umbrella is threadedly connected to the inner cavity of the cone, and the lower end of the anti-burst umbrella is close to the supporting cone. The one-way locking module is composed of a salvage head, an unsealing ring, an unsealing nail, a locking ring seat, a locking ring body, and a push sleeve. The salvage head is located in the inner cavity of the slip seat, the salvage head is threadedly connected to the unsealing ring, and the unsealing ring is hung with the slip seat via the unsealing nail. The lower end of the salvage head is installed in the inner cavity of the petal claw at the upper end of the rubber cylinder seat, the locking ring seat is threadedly connected to the push sleeve, and the inner cavity of the locking ring seat is equipped with a locking ring body. The sand prevention and filtering module is composed of a gas nozzle sleeve and a tail plug. The upper end of the gas nozzle sleeve is threadedly connected to the lower end of the center rod, and the lower end of the gas nozzle sleeve is threadedly connected to the tail plug.

[0005] As a preferred technical solution of the utility model, the outer surface of one end of the center rod is connected to the inner wall of the push sleeve by a thread, and the polytetrafluoroethylene gasket is located below the air nozzle body.

[0006] As a preferred technical solution of the utility model, the cap, the slip seat, the slip body and the cone are sleeved on the outer surfaces of the fishing head and the rubber cartridge seat.

[0007] As an optimal technical solution of the utility model, the rubber cylinder body and the spacer ring are arranged on the outer surface of the rubber cylinder seat, the petal claws milled at the upper end of the rubber cylinder seat are buckled in the inner cavity of the cava seat, and the inner cavity of the petal claws at the upper end of the rubber cylinder seat is supported by the lower end of the salvage head.

[0008] As a preferred technical solution of the utility model, the anti-burst umbrella, the supporting cone, the rubber tube body, the spacer ring, and the rubber tube seat are sleeved on the outer surface of the central rod.

[0009] As a preferred technical solution of the utility model, the inner cavity of the lock ring body and the outer surface of the lower end of the rubber cylinder seat are provided with meshing one-way teeth.

[0010] Compared with the prior art, the utility model can achieve the following beneficial effects:

[0011] 1. When the one-way anchoring module is placed on top and is subjected to the lower high pressure, the high pressure can help the one-way locking module to further lock forward, strengthen the locking function, and cause no shear damage to the locking mechanism, so that it has a stronger ability to withstand the lower high pressure; the main seal is placed on the bottom, and the lower high pressure is used to promote the further positive compression of the main seal. The anti-burst function design of the main seal prevents the main seal from being damaged when subjected to the lower high pressure, and the sealing performance can be maintained for a long time, so it is more suitable for the pressure control of abnormally high-pressure gas wells at the bottom. When the main seal is subjected to the lower high pressure, it will not rush into the annular gap between the tool and the oil pipe to jam the throttle, causing the salvage throttle to fail and complicate the downhole situation; the sand prevention filter module filters out solid formation sand with a particle size larger than the design value, thereby protecting the oil pipe and other tools along the airflow of the tool from high-speed solid particle abrasion and extending its service life;

[0012] 2. The polytetrafluoroethylene gasket is installed under the air nozzle body so that the air nozzle body provides low-strength support for the polytetrafluoroethylene gasket. The cap, slip seat, slip body and cone are sleeved on the outer surface of the fishing head and the rubber cartridge seat. The increase or decrease of the axial clearance between the slip seat and the cone can control the radial expansion or contraction of the slip body to help the tool anchor and support the oil pipe. The inner cavity of the split claw at the upper end of the rubber cartridge seat is supported by the lower end of the fishing head to prevent the rubber cartridge seat and the slip seat from being out of the groove and failing. The locking ring seat, locking ring body and push sleeve become a relative whole and can only slide upward along the rubber cartridge seat, thereby maintaining the overall self-locking of the tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model in the assembly standby state.

[0014] Figure 2 It is a schematic diagram of the structure of the utility model in the hands-free sealing state.

[0015] Figure 3 It is a schematic diagram of the structure of the utility model in the catching and unsealing state.

[0016] Among them: 1. Connector; 2. Shear pin; 3. Salvage head; 4. Center rod; 5. Drop joint; 6. Cap; 7. Unsealing ring; 8. Unsealing nail; 9. Slip seat; 10. Slip body; 11. Cone; 12. Anti-burst umbrella; 13. Support cone; 14. Rubber cartridge body; 15. Spacer ring; 16. Rubber cartridge seat; 17. Locking ring seat; 18. Locking ring body; 19. Push sleeve; 20. Air nozzle body; 21. Polytetrafluoroethylene gasket; 22. Air nozzle sleeve; 23. Tail plug. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0018] For example, please refer to Figure 1 As shown, the utility model provides a slip type gas well throttle, including a one-way anchoring module, a compression sealing module, a one-way locking module, and a sand prevention filtering module. The one-way anchoring module is composed of a cap 6, a slip seat 9, a slip body 10, and a cone 11. The cap 6 is threadedly connected to the slip seat 9. A single quenching tooth is provided on the outer surface of the slip body 10. The slip body 10 is hung below the slip seat 9 through a T-shaped groove. The lower end of the slip body 10 is stuck in the dovetail inclined groove of the cone 11. The compression sealing module is composed of a connector 1, a shear pin 2, a center rod 4, a hand-release joint 5, an anti-burst umbrella 12, a support cone 13, and a rubber The cylinder body 14, the spacer ring 15, the rubber cylinder seat 16, the air nozzle body 20, and the polytetrafluoroethylene gasket ring 21 are composed. The upper end of the hand-release joint 5 is hung with the connecting head 1 through the shear pin 2, and the lower end of the hand-release joint 5 is threadedly connected to the center rod 4. The air nozzle body 20 is installed in the inner cavity of the lower end of the center rod 4. The anti-burst umbrella 12 is threadedly connected to the inner cavity of the cone 11, and the lower end of the anti-burst umbrella 12 is close to the support cone 13. The one-way locking module is composed of a salvage head 3, an unsealing ring 7, an unsealing nail 8, a locking ring seat 17, a locking ring body 18, and a push sleeve 19. The salvage head 3 is located in the inner cavity of the slip seat 9, and the salvage head 3 is threadedly connected to the unsealing ring 7. The unsealing ring 7 is threadedly connected to the center rod 4. The unsealing nail 8 is hung with the slip seat 9, the lower end of the salvage head 3 is installed in the inner cavity of the petal claw at the upper end of the rubber cylinder seat 16, the lock ring seat 17 is threadedly connected with the push sleeve 19, and the inner cavity of the lock ring seat 17 is installed with a lock ring body 18. The sand prevention filter module is composed of a nozzle sleeve 22 and a tail plug 23. The upper end of the nozzle sleeve 22 is threadedly connected to the lower end of the center rod 4, and the lower end of the nozzle sleeve 22 is threadedly connected to the tail plug 23; when the one-way anchor module is designed to withstand the lower high pressure, the high pressure can help the one-way locking module to further positively lock, strengthen the locking function, and have no shear damage to the locking mechanism, so it has a stronger ability to withstand the lower high pressure; the main seal The downward design utilizes the lower high pressure to promote further positive compression of the main seal. The anti-blowout function design of the main seal prevents the main seal from being damaged when subjected to the lower high pressure, and the sealing performance can be maintained for a long time, so it is more suitable for the pressure control of abnormally high-pressure gas wells at the bottom. When the main seal is subjected to the lower high pressure, it will not break into the annular gap between the tool and the oil pipe to jam the throttle, causing the salvage throttle to fail and complicating the downhole situation. The sand prevention filter module filters out solid formation sand with a particle size larger than the design value, thereby protecting the oil pipe and other tools along the airflow of the tool from high-speed solid particle abrasion and extending its service life.

[0019] like Figure 1As shown, the outer surface of one end of the center rod 4 is threadedly connected to the inner wall of the push sleeve 19, and the polytetrafluoroethylene gasket ring 21 is located below the air nozzle body 20; by installing the polytetrafluoroethylene gasket ring 21 below the air nozzle body 20, the air nozzle body 20 provides low-strength support for the polytetrafluoroethylene gasket ring 21.

[0020] like Figure 1 As shown, the cap 6, the slip seat 9, the slip body 10, and the cone 11 are sleeved on the outer surfaces of the fishing head 3 and the rubber cartridge seat 16; by sleeved on the outer surfaces of the fishing head 3 and the rubber cartridge seat 16, the increase or decrease of the axial clearance between the slip seat 9 and the cone 11 can control the radial expansion or contraction of the slip body 10, so as to help the tool anchor and support the oil pipe.

[0021] like Figure 1 As shown, the rubber cartridge body 14 and the spacer ring 15 are sleeved on the outer surface of the rubber cartridge seat 16. The split claws processed by milling at one end of the rubber cartridge seat 16 are buckled in the inner cavity of the slip seat 9. The split claw inner cavity at the upper end of the rubber cartridge seat 16 is supported by the lower end of the salvage head 3; the split claw inner cavity at the upper end of the rubber cartridge seat 16 is supported by the lower end of the salvage head 3 to prevent the rubber cartridge seat 16 and the slip seat 9 from being out of the groove and failing.

[0022] like Figure 1 As shown, the anti-burst umbrella 12, the support cone 13, the rubber tube body 14, the spacer ring 15, and the rubber tube seat 16 are sleeved on the outer surface of the center rod 4; by sleeved the anti-burst umbrella 12, the support cone 13, the rubber tube body 14, the spacer ring 15, and the rubber tube seat 16 on the outer surface of the center rod 4, the rubber tube body 14 is axially compressed to form a seal with the oil pipe, and at the same time, the support cone 13 squeezes the anti-burst umbrella 12 to expand radially to occupy the annular gap between the tool and the oil pipe, preventing the rubber tube body 14 from advancing into the gap and being damaged when under pressure, thereby extending the sealing life of the rubber tube body 14 and improving its sealing strength.

[0023] like Figure 1 As shown, the inner cavity of the lock ring body 18 and the outer surface of the lower end of the rubber cartridge seat 16 are provided with meshing one-way teeth; by providing meshing one-way teeth on the inner cavity of the lock ring body 18 and the outer surface of the lower end of the rubber cartridge seat 16, the lock ring seat 17, the lock ring body 18, and the push sleeve 19 become a relative whole and can only slide upward along the rubber cartridge seat 16, thereby maintaining the overall self-locking of the tool.

[0024] Specific working principle:

[0025] When the tool is in the unsealed state, Figure 2As shown, the tool is lowered into the well along with the steel cable and the jar. After reaching the designed position, the tool is lifted up for a certain distance, the steel cable is rapidly lowered and the brake is suddenly applied. The tool is suddenly braked in the high-speed descending state, and the fishing head 3, the cap 6, the unsealing ring 7, the slip seat 9, the slip body 10, and the rubber cylinder seat 16 form a whole and move downward relatively. At this time, the connector 1, the hand-release joint 5, the center rod 4, the air nozzle body 20, the air nozzle sleeve 22, the tail plug 23, the push sleeve 19, the locking ring body 18, the locking ring seat 17, the rubber cylinder body 14, the spacer ring 15, the support cone 13, the anti-burst umbrella 12, and the cone 11 form a whole and move upward relatively. At this time, the main body 10 of the slip expands radially to anchor the supporting oil pipe and continue to lift the steel cable. The two sets move towards each other as a whole. After the main body 10 of the slip anchors the oil pipe, the anti-burst umbrella 12 expands to occupy the annular gap between the tool and the casing. At this time, the rubber cylinder main body 14 is compressed, and the jar is operated by the method of slowly releasing and quickly lifting the steel cable and suddenly braking to apply an upward shock force to the connector 1. At this time, all the accessories associated with the connector 1, such as the hand-release joint 5, the center rod 4, the air nozzle main body 20, the air nozzle sleeve 22, the tail plug 23, the push sleeve 19, the locking ring main body 18, the locking ring seat 17, the rubber cylinder main body 14, the spacer ring 15, the support cone 13, the anti-burst umbrella 12 The cone 11 will be subjected to the upward shock force applied by the jar. When the slip body 10 is driven to anchor the oil pipe, the rubber tube body 14 compresses and seals the oil pipe. When the shock force applied by the jar to the connector 1 is greater than the strength of the shear pin 2, the shear pin 2 is cut off, the connector 1 is separated from the hand-release joint 5, and the sealing is completed. The unsealing nail 8 controls the lower end of the fishing head 3 to always support the inner cavity of the petal claw at the upper end of the rubber tube seat 16. The rubber tube seat 16 is stably connected with the inner cavity of the slip seat 9. Because the lock ring body 18 and the rubber tube seat 16 can only be displaced in one direction through the one-way tooth meshing, all the accessories controlled by the lock ring seat 17, the lock ring seat 17, the push sleeve 19, the air The nozzle body 20, the air nozzle sleeve 22, the tail plug 23, and the center rod 4 all maintain a stable position to form an automatic locking. The rubber sleeve body 14 is compressed for a long time to form a seal with the oil pipe. The cava body 10 is supported by the restoring elastic force of the rubber sleeve body 14 to radially expand and anchor the oil pipe. When throttling production passes through the air nozzle body 20, the pressure below the rubber sleeve body 14 is higher than the pressure above to form a positive pressure difference below. The pressure difference acts on the lower end of the rubber sleeve body 14, which makes the rubber sleeve body 14 tend to be further compressed. Therefore, the sealing function of the rubber sleeve body 14 and the anchoring support function of the cava body 10 are enhanced, and its working performance is stable.

[0026] When this tool is in the state of being unsealed Figure 3As shown, the salvage tool is lowered into the well along with the steel cable and the jar. After reaching the designed position, the salvage tool is quickly lowered to impact. The salvage tool captures the salvage head 3. The steel cable is slowly lowered, quickly lifted, and suddenly braked to operate the jar to apply an upward shock force to the salvage head 3. The unsealing nail 8 is cut off, and the unsealing ring 7 is dragged upward along with the salvage head 3 and the cap 6, and the slip seat 9 and the slip body 10 are dragged upward in sequence. The slip body 10 slides along the inclined surface of the cone 11 and retracts inward, and the anchoring support of the slip body 10 and the oil pipe is released. At the same time, the petal claws at the upper end of the rubber cylinder seat 16 lose the internal support of the salvage head 3, and the rubber cylinder seat 16 is separated from the slip seat 9 by disengaging the groove. The accessories associated with the slip seat 9, such as the lock ring seat 17, the lock ring body 18, the push sleeve 19, the air nozzle body 20, and the air nozzle sleeve 22, tail plug 23, center rod 4 moves downward relative to slip seat 9, rubber cylinder body 14 is axially reset and shrinks in diameter, so that the tool is completely unsealed. When the steel cable is lifted to drive the fishing head 3 upward, the release joint 5 is located in the inner cavity of the fishing head 3, and the accessories related to the release joint 5, center rod 4, air nozzle body 20, air nozzle sleeve 22, tail plug 23, push sleeve 19, lock ring body 18, lock ring seat 17, rubber cylinder body 14, spacer ring 15, support cone 13, rubber cylinder seat 16 are lifted out of the oil pipe along with the release joint 5, and the accessories related to the fishing head 3, unsealing ring 7, cap 6, slip seat 9, slip body 10, cone 11, anti-burst umbrella 12 are lifted out of the oil pipe along with the fishing head 3. All the well-retaining accessories of the tool are lifted out of the oil pipe, and the fishing is successful.

[0027] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A slip-type gas well choke, comprising a one-way anchoring module, a compression sealing module, a one-way locking module, and a sand prevention and filtering module, characterized in that: The one-way anchoring module is composed of a cap (6), a slip seat (9), a slip body (10), and a cone (11). The cap (6) is threadedly connected to the slip seat (9). The outer surface of the slip body (10) is provided with a single hardened tooth. The slip body (10) is connected to the bottom of the slip seat (9) via a T-shaped groove. The lower end of the slip body (10) is clamped in the dovetail groove of the cone (11). The compression sealing module is composed of a connector (1), a shear pin (2 ), a center rod (4), a release joint (5), an anti-burst umbrella (12), a support cone (13), a rubber tube body (14), a spacer ring (15), a rubber tube seat (16), a gas nozzle body (20), and a polytetrafluoroethylene gasket (21), wherein the upper end of the release joint (5) is connected to the connecting head (1) via a shear pin (2), the lower end of the release joint (5) is threadedly connected to the center rod (4), the inner cavity of the lower end of the center rod (4) is equipped with a gas nozzle body (20), and the The anti-burst umbrella (12) is threadedly connected to the inner cavity of the cone (11), and the lower end of the anti-burst umbrella (12) is close to the support cone (13). The one-way locking module is composed of a fishing head (3), an unsealing ring (7), an unsealing nail (8), a locking ring seat (17), a locking ring body (18), and a push sleeve (19). The fishing head (3) is located in the inner cavity of the slip seat (9), the fishing head (3) is threadedly connected to the unsealing ring (7), and the unsealing ring (7) is connected to the slip seat (9) through the unsealing nail (8). The tile seat (9) is hung, the lower end of the salvage head (3) is installed in the inner cavity of the petal claw at the upper end of the rubber cylinder seat (16), the locking ring seat (17) is threadedly connected to the push sleeve (19), and the inner cavity of the locking ring seat (17) is installed with a locking ring body (18), and the sand prevention filter module is composed of an air nozzle sleeve (22) and a tail plug (23), the upper end of the air nozzle sleeve (22) is threadedly connected to the lower end of the center rod (4), and the lower end of the air nozzle sleeve (22) is threadedly connected to the tail plug (23).

2. A slip type gas well throttle according to claim 1, characterized in that: The outer surface of one end of the center rod (4) is threadedly connected to the inner wall of the push sleeve (19), and the polytetrafluoroethylene gasket (21) is located below the air nozzle body (20).

3. A slip type gas well throttle according to claim 1, characterized in that: The cap (6), the slip seat (9), the slip body (10), and the cone (11) are sleeved on the outer surfaces of the salvage head (3) and the rubber cylinder seat (16).

4. A slip type gas well throttle according to claim 1, characterized in that: The rubber cartridge body (14) and the spacer ring (15) are sleeved on the outer surface of the rubber cartridge seat (16); the split claws processed by milling at the upper end of the rubber cartridge seat (16) are buckled into the inner cavity of the slip seat (9); and the split claw inner cavity at the upper end of the rubber cartridge seat (16) is supported by the lower end of the salvage head (3).

5. The slip type gas well throttle according to claim 1, characterized in that: The anti-burst umbrella (12), the supporting cone (13), the rubber tube body (14), the spacer ring (15), and the rubber tube seat (16) are sleeved on the outer surface of the central rod (4).

6. The slip type gas well throttle according to claim 1, characterized in that: The inner cavity of the lock ring body (18) and the outer surface of the lower end of the rubber cylinder seat (16) are provided with meshing one-way teeth.

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