An emergency device for quickly replacing the casing slip gate of a steam injection wellhead

Abstract

A rescue device capable of quickly replacing the casing slip gate of a steam injection wellhead belongs to the technical field of replacing the casing slip gate of a steam injection wellhead. An expansion rubber is provided on the outside of the plug, a limit anchor hoop is provided on the top of the plug, and a number of evenly distributed anchor balls are provided inside the limit anchor hoop; a number of groups of plug sliders are embedded in the circumference of the side wall of the plug, the plug is provided with a plug cover, a push rod is provided inside the plug, and the other end of the push rod extends out of the plug cover and is connected to the lead screw. Beneficial effect: The present invention is aimed at emergency rescue during the use of the gas injection wellhead in the oil and gas field. It is connected to the casing four-way gate slip, the casing gate is opened, and the plug is pushed in. The front end of the plug enters the four-way and is anchored in the hanger space to prevent pressure from blowing out. The plug relies on boosting expansion to achieve a plugging effect. The slips, steel rings and gates in the dangerous area can be removed and replaced with new ones. The booster is reinstalled, the full set of plugs is retracted, the casing gate is closed, and the rescue is completed.

Description

Technical Field

[0001] The invention relates to an emergency device capable of quickly replacing a casing slip gate at a steam injection wellhead, and belongs to the technical field of replacing a casing slip gate at a steam injection wellhead. Background Art

[0002] Heavy oil from the Liaohe Oilfield is difficult to extract due to its high content of colloid and asphalt, resulting in poor fluidity. Therefore, most of the heavy oil wells in the Liaohe Oilfield are produced using thermal recovery technology. Most thermal recovery wells are subjected to high temperatures and high pressures. This can lead to failure of thermal seals in packer-insulated wells, and to leaks or loose seals in nitrogen-insulated wells due to alternating hot and cold conditions or problems with the connection itself. If not addressed promptly, these problems can lead to escalating dangers, loss of wellhead control, and widespread pollution. Current rescue measures are limited to leaking steel rings at the connection points and plugging them with slips through perforated holes and glue injection. This process requires a drill, and the high temperatures and high pressures associated with construction within the oil and gas field can easily lead to fires and explosions. Summary of the Invention

[0003] The purpose of the present invention is to provide an emergency rescue device that can quickly replace the casing slip gate of a steam injection wellhead, thereby solving the problem that the current emergency rescue is limited to the leakage of steel rings at the connection, the slips are punched and sealed with glue, a drill bit is required in the processing process, and fire and explosion are prone to occur due to high temperature and high pressure during construction in oil and gas fields.

[0004] To achieve the above-mentioned purpose, the present application proposes an emergency device for quickly replacing a casing slip gate at a steam injection wellhead, which is characterized by comprising a limit anchor hoop, an anchor ball, a graphite pressure plate, a graphite ring, a plug, a plug slider, an expansion rubber, a propulsion connecting rod, a plug cover, a clamp head, a graphite gland, a rotating shaft, a hand wheel, and a lead screw;

[0005] The outside of the plug is provided with an expansion rubber, the top of the plug is provided with a limit anchor hoop, and the limit anchor hoop is provided with a number of evenly distributed anchor balls; the side wall of the plug is circumferentially embedded with a number of groups of plug sliders, the plug is provided with a plug cover, and the inside of the plug is provided with a propulsion connecting rod, the other end of the propulsion connecting rod extends out of the plug cover and is connected to the screw; the screw is provided with a clamp head, a graphite pressure cover, a rotating shaft, and a handwheel from top to bottom.

[0006] The inner wall of the plug is provided with a boss, and the inner diameter of the boss is larger than the outer diameter of the push connecting rod.

[0007] A graphite ring is arranged in the cavity formed by the upper portion of the boss on the inner wall of the plug and the plug, and a graphite pressing plate is arranged on the graphite ring.

[0008] The number of the anchoring balls is 4.

[0009] The top of the plug is connected to the limiting anchor hoop by threads.

[0010] The number of the plugging slide blocks is 4.

[0011] The other end of the push connecting rod is threadedly connected to the plug protection cover, and the plug protection cover is provided with a threaded hole that matches the thread of the push connecting rod.

[0012] A graphite ring is provided between the clamp head and the graphite gland.

[0013] A bearing pressure cover is provided outside the rotating shaft; the outer side of the bearing pressure cover is threadedly connected to a connecting tube; and the connecting tube extends upward to the outer wall of the clamp head.

[0014] A pressure bearing is provided in the cavity between the connecting cylinder and the rotating shaft.

[0015] Beneficial effects: The present invention is designed for emergency rescue during the use of gas injection wellheads in oil and gas fields. The device is connected to the casing four-way gate slip, the casing gate is opened, and the plug is pushed in. The front end of the plug enters the four-way and anchors in the hanger space to prevent pressure from blowing out. The plug expands with the help of the booster to achieve the plugging effect. The slips, steel rings and gates in the dangerous area can be removed and replaced with new ones. The booster is reinstalled, the entire set of plugs is retrieved, and the casing gate is closed to complete the rescue. Steam injection in heavy oil blocks is accompanied by high temperature and high pressure, and the effects are as follows:

[0016] 1. The front end of the plugging device of the present invention is designed with an anchoring device to greatly restrain the pressure from squeezing outward. It is designed with an anchoring ball, and the anchoring retraction and deployment effectively ensure the recovery of the entire device;

[0017] 2. The seal of the present invention adopts high temperature resistant sealing element, which is suitable for heavy oil thermal recovery wells. The sealing mouth adopts graphite ring, which utilizes the characteristics of graphite to achieve a more effective sealing effect.

[0018] 3. The propulsion connecting rod of the present invention can be pushed and pulled horizontally, and can also be rotated, which is safe, simple and convenient to operate; safe, no need to use thermal power; fast and easy to operate, flexible to use, and recyclable plug;

[0019] 4. The present invention is resistant to high temperature and high pressure. The higher the pressure, the stronger the reverse anchoring.

[0020] 5. The booster handwheel control of the present invention has strong controllability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of an emergency device that can quickly replace the casing slip gate of a steam injection wellhead;

[0022] Figure 2 It is the cross-sectional view of AA.

[0023] Description of the drawings: 1. Limit anchor hoop; 2. Anchor ball; 4. Graphite pressure plate; 5. Graphite ring; 6. Plug; 7. Plug slider; 8. Expansion rubber; 9. Propulsion connecting rod; 10. Plug cover; 11. Clamp head; 12. Graphite ring; 13. Graphite pressure cap; 14. Connecting cylinder; 15. Pressure bearing; 16. Rotating shaft; 17. Bearing pressure cap; 18. Handwheel; 19. Screw. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] Next, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, cross-sectional views of device structures may be partially enlarged and not to scale when describing the embodiments of the present invention. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, three-dimensional dimensions, including length, width, and depth, should be included.

[0027] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0028] The following is combined with Figure 1 The present invention is further described in detail with reference to the following specific embodiments: This application is further described with reference to this example.

[0029] Example 1

[0030] like Figure 1 As shown, this embodiment provides an emergency device for quickly replacing a steam injection wellhead casing slip gate, comprising a limit anchor hoop 1, an anchor ball 2, a graphite pressure plate 4, a graphite ring 5, a plug 6, a plug slider 7, an expansion rubber 8, a propulsion connecting rod 9, a plug cover 10, a clamp head 11, a graphite gland 13, a rotating shaft 16, a hand wheel 18, and a screw 19;

[0031] The plug 6 is provided with an expansion rubber 8 on the outside, a limiting anchor hoop 1 is provided on the top of the plug 6, and a number of evenly distributed anchor balls 2 are provided inside the limiting anchor hoop 1; a number of groups of plug sliders 7 are embedded in the circumference of the side wall of the plug 6, the plug 6 is provided with a plug cover 10, and a propulsion connecting rod 9 is provided inside the plug 6, and the other end of the propulsion connecting rod 9 extends out of the plug cover 10 and is connected to the screw 19; the screw 19 is provided with a clamp head 11, a graphite pressure cover 13, a rotating shaft 16, and a handwheel 18 from top to bottom.

[0032] The inner wall of the plug 6 is provided with a boss, and the inner diameter of the boss is larger than the outer diameter of the push connecting rod 9.

[0033] A graphite ring 5 is provided in the cavity formed by the upper portion of the boss on the inner wall of the plug 6 and the plug 6 , and a graphite pressing plate 4 is provided on the graphite ring 5 .

[0034] The number of the anchoring balls 2 is 4.

[0035] The top of the plug 6 is connected to the limiting anchor hoop 1 by threads.

[0036] The number of the plugging slide blocks 7 is 4.

[0037] The other end of the push rod 9 is threadedly connected to the plug protection cover 10, and the plug protection cover 10 is provided with a threaded hole that is threadedly matched with the push rod 9.

[0038] A graphite ring 12 is provided between the clamp head 11 and the graphite gland 13 .

[0039] The rotating shaft 16 is provided with a bearing cover 17 on the outside; the outer side of the bearing cover 17 is threadedly connected to the connecting tube 14; and the connecting tube 14 extends upward to the outer wall of the clamp head 11.

[0040] A pressure bearing 15 is provided in the cavity between the connecting cylinder 14 and the rotating shaft 16 .

[0041] Example 2

[0042] A rescue device for quickly replacing the casing slip gate of a steam injection wellhead, comprising a limit anchor hoop 1, an anchor ball 2, a graphite pressure plate 4, a graphite ring 5, a plug 6, a plug slider 7, an expansion rubber 8, a propulsion connecting rod 9, a plug protective cover 10, a clamp head 11, a graphite pressure cover 13, a rotating shaft 16, a hand wheel 18, and a screw 19; the plug 6 is provided with an expansion rubber 8 on the outside, the plug 6 is provided with a limit anchor hoop 1 on the top, and a plurality of evenly distributed anchor balls 2 are provided in the limit anchor hoop 1; a plurality of groups of plug sliders 7 are embedded in the circumferential direction of the side wall of the plug 6, the plug 6 is provided with a plug protective cover 10, a propulsion connecting rod 9 is provided inside the plug 6, and the other end of the propulsion connecting rod 9 extends out of the plug protective cover 10 and is connected to the screw 19; the screw 19 is provided with a clamp head 11, a graphite pressure cover 13, a rotating shaft 16, a hand wheel 18, and a screw 19 in sequence from top to bottom. Rotating shaft 16, handwheel 18; a boss is provided on the inner wall of the plug 6, and the inner diameter of the boss is larger than the outer diameter of the propulsion connecting rod 9; a graphite ring 5 is provided in the cavity formed by the upper part of the boss on the inner wall of the plug 6 and the plug 6, and a graphite pressure plate 4 is provided on the graphite ring 5; the number of anchoring balls 2 is 4; the top of the plug 6 is threadedly connected to the limiting anchor hoop 1; the number of plug sliders 7 is 4; the other end of the propulsion connecting rod 9 is threadedly connected to the plug cover 10, and the plug cover 10 is provided with a threaded hole that matches the thread of the propulsion connecting rod 9; a graphite ring 12 is provided between the clamp head 11 and the graphite pressure cover 13; a bearing pressure cover 17 is provided on the outside of the rotating shaft 16; the outer side of the bearing pressure cover 17 is threadedly connected to the connecting cylinder 14; the connecting cylinder 14 extends upward to the outer wall of the clamp head 11; a pressure bearing 15 is provided in the cavity between the connecting cylinder 14 and the rotating shaft 16.

[0043] Specifically, after connecting the clamp head 11 in the device with the connecting sleeve gate that needs emergency rescue, open the sleeve gate, push the handwheel 18 so that the screw 19 drives the connected push rod 9 through the connecting sleeve gate and enters the large four-way and hits the side wall of the original pipe in the large four-way, that is, the part above the clamp head 11 enters the large four-way, then remove the handwheel 18, rotate the screw 19 to drive the connecting rod 9 to rotate so that the push rod 9 hits the anchor ball 2 to achieve the anchoring effect; continue to rotate the push rod 9 so that the plugger slider 7 embedded in the side wall of the plugger 6 squeezes the expansion rubber 8 in the circumferential direction under the extrusion of the push rod 9, so that the expansion rubber 8 expands in the axial direction, so that the outer wall of the expansion rubber 8 is connected to the small connecting rod of the large four-way. The interior fits together to achieve the effect of blocking the original pipeline of the connecting sleeve, preventing the pressure in the pipeline from leaking out and causing danger; at this time, the entire rescue device is separated by disconnecting the propulsion connecting rod 9 and the screw 19, and the clamp head 11 is removed at this time, and a new gate and slip are replaced. At this time, the propulsion connecting rod 9 is re-docking, the clamp head 11 is connected, and the screw linkage 9 is rotated in the reverse direction to unscrew and release the anchor. At this time, the anchor ball 2 and the plugger slider 7 are retracted to the initial state, and the handwheel 18 is installed and rotated in the reverse direction. The screw 19 pulls out the connecting rod 9 and the above part to the slip 11, pulls out the above part of the clamp head 11 that extends into the large four-way, closes the casing gate, and removes the clamp head 11, thereby achieving the purpose of fast and faster.

[0044] The above is a further detailed description of the present invention in conjunction with a specific preferred technical solution, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to be protected by the present invention.

Claims

1. An emergency device for quickly replacing the casing slip gate of a steam injection wellhead, characterized in that: It comprises a limit anchoring hoop (1), an anchoring ball (2), a graphite pressure plate (4), a graphite ring a (5), a plug (6), a plug slider (7), an expansion rubber (8), a propulsion connecting rod (9), a plug protective cover (10), a clamp head (11), a graphite ring b (12), a graphite pressure cover (13), a rotating shaft (16), a hand wheel (18), and a lead screw (19); The plug (6) is provided with an expansion rubber (8) on the outside, a limit anchor hoop (1) is provided on the top of the plug (6), and a plurality of evenly distributed anchor balls (2) are provided inside the limit anchor hoop (1); a plurality of groups of plug sliders (7) are embedded in the circumferential direction of the side wall of the plug (6), the plug (6) is provided with a plug protective cover (10), and a propulsion connecting rod (9) is provided inside the plug (6), and the other end of the propulsion connecting rod (9) extends out of the plug The protective cover (10) is connected to the screw (19); the screw (19) is provided with a clamp head (11), a graphite pressure cover (13), a rotating shaft (16), and a hand wheel (18) in order from top to bottom; a graphite ring a (5) is provided in the cavity formed by the upper part of the boss of the inner wall of the plug (6) and the plug (6); a graphite pressure plate (4) is provided on the graphite ring a (5); and a graphite ring b (12) is provided between the clamp head (11) and the graphite pressure cover (13).

2. The emergency device for quickly replacing the steam injection wellhead casing slip gate according to claim 1, characterized in that: The inner wall of the plug (6) is provided with a boss, and the inner diameter of the boss is larger than the outer diameter of the propulsion connecting rod (9).

3. The emergency device for quickly replacing the steam injection wellhead casing slip gate according to claim 1, characterized in that: The number of the anchoring balls (2) is 4.

4. The emergency device for quickly replacing the steam injection wellhead casing slip gate according to claim 1, characterized in that: The top of the plug (6) is connected to the limiting anchor hoop (1) by threaded connection.

5. The emergency device for quickly replacing the steam injection wellhead casing slip gate according to claim 1, characterized in that: The number of the plugging sliders (7) is 4.

6. The emergency device for quickly replacing the steam injection wellhead casing slip gate according to claim 1, characterized in that: The other end of the push rod (9) is threadedly connected to the plug protection cover (10), and the plug protection cover (10) is provided with a threaded hole that is threadedly matched with the push rod (9).

7. The emergency device for quickly replacing the steam injection wellhead casing slip gate according to claim 1, characterized in that: The rotating shaft (16) is provided with a bearing cover (17) on the outside; the outer side of the bearing cover (17) is threadedly connected to the connecting tube (14); the connecting tube (14) extends upward to the outer wall of the clamp head (11).

8. The emergency device for quickly replacing the steam injection wellhead casing slip gate according to claim 7, characterized in that: A pressure bearing (15) is provided in the cavity between the connecting cylinder (14) and the rotating shaft (16).

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