High-pressure long-acting fishable bridge plug
By designing high-pressure long-effect bridge plugs, using multiple locking mechanisms and multiple unsealing methods, the problems of low pressure bearing and high cost of drillable bridge plugs of conventional tools are solved, and reliable sealing and unsealing under high pressure and high temperature conditions are achieved, reducing operating costs.
Patent Information
- Application Number
- CN202510164350.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-14
- Publication Date
- 2025-05-06
AI Technical Summary
In the existing oil field oil production technology, conventional tool rubber cylinders have low pressure bearings, resulting in failure of the sealing of the uplink machinery; the cost of drilling bridge plugs is high and grinding and milling is required when unsealing, which increases the operating cost.
A high-pressure long-effect skimmable bridge plug is designed, adopting a variety of locking mechanisms and a variety of unsealing methods, including salvage joints, threaded gripping internal fishing and double-sliding forward rotary pipe column unsealing to ensure that the tool is reliably sealed and unsealed under high pressure and high temperature conditions.
This high-pressure long-effect bridge plug can withstand 40MPa sleeve pressure and withstand temperature 120°, which improves the reliability of sealing and layer development effect, reduces operating costs, and improves sealing efficiency through various unsealing methods.
Smart Images
Figure CN119933590A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of oil field production, and particularly relates to a high-pressure, long-acting, salvageable bridge plug. Background Art
[0002] With the implementation of the plugging block, the workload of upward plugging has increased year by year. In recent years, the oil field has vigorously promoted the research and application of upward plugging technology, and has achieved mature mechanical plugging technologies such as self-testing and losing packers and drillable bridge plugs. However, the following problems still exist: 1. The conventional tool rubber cylinder has low pressure bearing capacity and the mechanical seal of the upper return fails; 2. The cost of drillable bridge plugs is high, and milling is required when unsealing, which increases operating costs. Summary of the invention
[0003] In view of the above shortcomings, the purpose of the present invention is to provide a high-pressure, long-lasting and salvageable bridge plug to solve the problem of plugging failure in the return mechanical plugging process.
[0004] The technical solution adopted by the invention is: a high-pressure, long-lasting, salvageable bridge plug, the technical key points of which are: an upper joint, a sleeve threadedly connected to the outer side of the upper joint, a first center tube threadedly connected to the inner side of the upper joint, a first back cap and a seating sleeve arranged outside the first center tube, and the first back cap and the seating sleeve threadedly connected. The first center tube is threadedly connected to the second center tube, and the fixed piston and the sliding piston inserted into the seating sleeve are also sleeved outside the first center tube at the same time, and the fixed piston is threadedly connected to the first center tube, and the sliding piston can be slidably sleeved between the seating sleeve and the center tube, and the other end of the seating sleeve is pressed against one end of the second back cap, and the second back cap is threadedly connected to the retaining spring sleeve, and the salvage joint inserted in the retaining spring sleeve is sleeved outside the first center tube and the third center tube, and the third center tube is sleeved outside the second center tube, and the sealing plug inserted in the second center tube corresponds to the position of the first locking block, and the first locking block is limited, and the second center tube and the sealing plug are fixed by the release pin, the second center tube and the third center tube are positioned by the first locking block, and the first stabilizing pin fixes the third center tube to the second center tube, the salvage joint is fixedly connected to the third center tube by the unsealing pin, the sealing plug of the second center tube is fixed to the second center tube by the release pin, and the release stopper inserted in the second center tube is threadedly connected to the second center tube; The circlip sleeve is threadedly connected to the sealing piston, and the sealing piston is fixedly connected to the third center tube through the sealing pin; the salvage joint is connected to the third center tube through the unsealing pin, and the second locking block inserted in the salvage joint positions the salvage joint, the third center tube and the circlip retaining ring inserted into the salvage joint and sleeved outside the third center tube. A circlip seat is provided outside the circlip retaining ring, and the circlip seat is threaded outside the third center tube. A circlip is provided between the circlip retaining ring and the circlip seat, and the circlip retaining ring presses the circlip against the circlip seat; the second locking block and the circlip retaining ring are inserted into the right side of the salvage joint in turn, and the second locking block is inserted into the circlip retaining ring to lock the position of the circlip retaining ring and the third center tube, and the circlip retaining ring simultaneously locks the circlip in the existing position without moving; The fourth center tube is sleeved on the outer diameter of the third center tube, and the sealing piston is connected to the third center tube by a sealing pin, and the fourth center tube inserted into one side of the sealing piston is threadedly connected to the sealing piston; a side rubber tube, a spacer ring, a middle rubber tube, another spacer ring and a side rubber tube are sleeved on the outside of the fourth center tube in sequence, the fourth center tube is outerly connected to the upper vertebral body and fixedly connected to the upper cone, the upper vertebral body is outerly connected to the slip sleeve and the two are fixed together by a second stabilizing pin, the lower vertebral body is inserted into the other end of the slip sleeve and fixed by an adjusting ring connected to the slip sleeve, the adjusting ring is sleeved on the outside of the lower vertebral body, a slip and a spring are arranged in the slip sleeve, the slip sleeve is between the upper vertebral body, the slip sleeve and the lower vertebral body, the slip is embedded in the slip sleeve, the spring is clamped between the slip and the slip sleeve, the elastic force generated by the spring separates the slip from the slip sleeve when going down the well, the slip is tightly attached to the third center tube, the lower joint is threadedly connected to the third center tube, and the lower vertebral body is threadedly connected to the lower joint.
[0005] In the above scheme, the cava is an integrally formed structure, including a first cava tooth and a second cava tooth symmetrically arranged, a transverse groove is provided between the first cava tooth and the second cava tooth, sharp teeth are respectively provided on the first cava tooth and the second cava tooth, a spring mounting hole is provided on the transverse groove, and empty knives are respectively provided at corresponding positions of the first cava tooth and the second cava tooth, and the sharp teeth are arranged on both sides of the empty knives.
[0006] In the above scheme, the angle of the sharp teeth is directional, one side of the sharp teeth forms an angle of 40° to 50° with the horizontal plane, and the top angle of the sharp teeth is a 90° right angle.
[0007] In the above scheme, the salvage joint is provided with an external thread for being screwed with the outer salvage tube, and the salvage joint is lifted up by the outer salvage tube to realize unsealing.
[0008] In the above scheme, the salvage joint is provided with an internal thread for screw connection with the threaded catch inner fishing, and the threaded catch inner fishing is utilized to unseal the upper lifting salvage joint.
[0009] In the above scheme, the inner diameter of the third central tube is provided with a reverse thread for threading with the 48 double sliders, and the third central tube and the lower joint thread are unscrewed by rotating the pipe column forward to achieve unsealing.
[0010] The beneficial effects of the present invention are as follows: the high-pressure long-acting bridge plug can be salvaged, the side rubber tube, the spacer ring, the middle rubber tube, and the first back cap are sequentially mounted on the outside of the fourth center tube, the sealing piston is threadedly connected to the fourth center tube, the sealing piston, the upper vertebral body, the slip, the slip sleeve and the adjustment ring are sequentially mounted on the outside of the third center tube, the slip sleeve is threadedly connected to the adjustment ring, and the lower joint is threadedly connected to the third center tube. It can withstand the upper and lower casing pressure of 40MPa, the temperature resistance of 120°, can withstand high pressure, the upper end of the required plugging layer, improve the plugging reliability, and ensure the layer development effect; the tool has a variety of locking block mechanisms to prevent the tool from being lost due to premature sealing and unsealing caused by misoperation; the tool slip can ensure the anchoring force of the tool; the tool has a variety of unsealing methods to improve the tool unsealing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0012] Figure 1 It is an assembly diagram of a high-pressure long-acting salvageable bridge plug in an embodiment of the present invention; Figure 2 This is a schematic diagram of the lock block protection structure in an embodiment of the present invention; Figure 3 for Figure 1 A partial enlarged view of Figure 4 Schematic diagram of the slip structure in an embodiment of the present invention, (a) is a main view; (b) is a top view; (c) is a side view Figure 5 This is a schematic diagram of the decapsulation structure in an embodiment of the present invention; The serial number description is as follows: 1 upper joint, 2 sheath, 3 first back cap, 4 first center tube, 5 seat seal, 6 fixed piston, 7 sliding piston, 8 salvage joint, 9 second back cap, 10 retaining ring, 11 second center tube, 12 third center tube, 13 first locking block, 14 first stabilizing pin, 15 release pin, 16 unlocking pin, 17 second locking block, 18 retaining ring, 19 retaining ring, 20 retaining ring seat, 21 seat seal piston, 22 seat seal pin, 23 side Rubber cylinder, 24 spacer ring, 25 upper vertebra, 26 second stabilizing pin, 27 cava sleeve, 28 spring, 29 cava, 29-1 first cava tooth, 29-2 second cava tooth, 29-3 transverse groove, 29-4 spring mounting hole, 29-5 empty knife, 29-6 sharp teeth, 30 lower vertebra, 31 adjusting ring, 32 lower joint, 33 middle rubber cylinder, 34 fourth center tube, 35 release block, 36 sealing plug, 37 third back cap, 38 external scoop, 39 internal scoop. DETAILED DESCRIPTION
[0013] To make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the following is a brief description of the present invention in conjunction with the attached Figure 1-Figure 5 The present invention is further described in detail with reference to the accompanying drawings and specific embodiments.
[0014] The present embodiment adopts a high-pressure long-term salvageable bridge plug, and its specific structure is as follows: it includes an upper joint 1, a sleeve 2 is threadedly connected to the upper joint 1, a first central tube 4 is threadedly connected to the upper joint 1, a first back cap 3 and a setting sleeve 5 are arranged outside the first central tube 4, and the first back cap 3 is threadedly connected to the setting sleeve 5. The first central tube 4 is threadedly connected to the second central tube 11, and the fixed piston 6 and the sliding piston 7 inserted into the setting sleeve 5 are also sleeved outside the first central tube 4 at the same time, and the fixed piston 6 is threadedly connected to the first central tube 4, and the sliding piston 7 is sleeved between the setting sleeve and the central tube 1 as a movable part. The other end of the setting sleeve 5 is pressed against (not connected to) one end of the second back cap 9, and the second back cap 9 is threadedly connected to the retaining spring sleeve 10. . The salvage joint 8 inserted in the retaining spring sleeve 10 is sleeved outside the first central tube 4 and the third central tube 12. The third center tube 12 is sleeved outside the second center tube 11, and the sealing plug 36 inserted into the second center tube 11 corresponds to the position of the first locking block 13, the first locking block 13 is limited, and the second center tube 11 is fixed to the sealing plug 36 by the release pin 15. The second center tube 11 and the third center tube 12 are positioned by the first locking block 13, the first stabilizing pin 14 fixes the third center tube 12 to the second center tube 11, the salvage joint 8 is fixedly connected to the third center tube 12 by the unsealing pin 16, the sealing plug 36 is inserted into the second center tube, and fixedly connected by the release pin 15, and the release block 35 inserted into the second center tube 11 is threadedly connected to the second center tube 11.
[0015] The circlip sleeve 10 is threadedly connected to the setting piston 21, and the setting piston 21 is fixedly connected to the third center pipe 12 through the setting pin 22. The salvage joint 8 is connected to the third center pipe 12 through the unsealing pin 16. The second locking block 17 inserted in the salvage joint 8 positions the salvage joint 8, the third center pipe 12 and the circlip retaining ring 18 inserted into the salvage joint 8 and sleeved outside the third center pipe 12. A circlip seat 20 is provided outside the circlip retaining ring 18. The circlip retaining ring 20 is threadedly connected to the outside of the third center pipe 3. A circlip 19 is provided between the circlip retaining ring 18 and the circlip retaining ring 20. The circlip retaining ring 20 is threadedly connected to the outside of the third center pipe 3. A circlip 19 is provided between the circlip retaining ring 18 and the circlip retaining ring 20. The circlip retaining ring pushes the circlip against the circlip retaining ring. Two locking blocks are arranged near the position of the third center pipe 12 to ensure that the tool will not be set, unsealed or lost in advance during the downhole process, and the tool can be ensured to be safe and reliable.
[0016] The outer diameter of the third center tube 12 is sleeved with the fourth center tube 34. The fourth center tube 34, the sealing piston 12 and the third center tube 12 are connected through the sealing pin 22. The fourth center tube 34 is screwed with the sealing piston 21. The side rubber tube 23, the spacer ring 24, the middle rubber tube 33, another spacer ring and the side rubber tube 23 are sleeved on the outside of the fourth center tube 34 in sequence. The fourth center tube 34 is sleeved with the upper vertebral body 25 and fixedly connected with the upper cone 25. The upper vertebral body 25 is sleeved with the slip sleeve 27 and the two are fixed together through the second stabilizing pin 26. The lower vertebral body 30 is inserted into the other end of the slip sleeve 27 and fixed through the adjusting ring 31 connected with the slip sleeve 27. The adjusting ring 31 is sleeved on the outside of the lower vertebral body 30. A slip 29 and a spring 28 are arranged in the slip sleeve 27. The slip 29 is sleeved between the upper vertebral body, the slip sleeve and the lower vertebral body. The spring 28 is clamped between the slip and the slip sleeve. The spring separates the slip from the slip sleeve through elastic force and sticks to the third center tube 12. The lower joint 32 is threadedly connected to the third center tube 12, and the lower vertebral body 30 is threadedly connected to the lower joint 32.
[0017] The slip 29 of this embodiment is made of 20CrMnTi material and high-frequency processed. The slip 29 is an integrally formed structure, including a first slip tooth 29-1 and a second slip tooth 29-2 symmetrically arranged, a transverse groove 29-3 between the first slip tooth 29-1 and the second slip tooth 29-2, sharp teeth 29-6 are respectively arranged on the first slip tooth 29-1 and the second slip tooth 29-2, a spring mounting hole 29-4 is arranged on the transverse groove 29-3, and empty knives 29-5 are respectively arranged at the corresponding positions of the first slip tooth 29-1 and the second slip tooth 29-2. The angle of the sharp teeth 29-6 of this embodiment adopts a directional type, with the empty knife 29-5 as the central axis, the left side inclined surface of the sharp teeth 29-6 located on the left side of the empty knife 29-5 forms an angle of 40° with the horizontal plane, and the right side inclined surface of the sharp teeth 29-6 located on the right side of the empty knife 29-5 forms an angle of 40° with the horizontal plane. The top angles of the sharp teeth 29-5 are all 90° right angles. The integral cava teeth adopt the transverse groove opening to increase the anchoring sleeve area and improve the anchoring force of the tool.
[0018] The rubber cylinder of this embodiment adopts imported original rubber, and three rubber cylinders are used. This form can ensure the pressure resistance and high temperature resistance of the tool, and can prevent the rubber cylinder from being damaged and pressed onto the steel part when subjected to high pressure, causing the rubber cylinder to lose its seal.
[0019] The tool of this embodiment has three unsealing modes: outer fishing with a fishing tube, inner fishing with a thread grab, and positive rotation of a center tube with double slide blocks, and can realize unsealing in multiple ways.
[0020] The high-pressure long-acting bridge plug in this embodiment is assembled as follows: the side rubber tube 23, the spacer ring 24, the middle rubber tube 33, and the first back cap 3 are sequentially mounted on the outside of the fourth center tube 34, and the sealing piston 21 is threadedly connected to the fourth center tube 34. The sealing piston 21, the upper vertebral body 25, the slip 29, the slip sleeve 27, and the adjusting ring 31 are sequentially mounted on the outside of the third center tube 12, the slip sleeve 27 is threadedly connected to the adjusting ring 31, the lower joint 32 is threadedly connected to the third center tube 12, the lower vertebral body 30 is threadedly connected to the lower joint 32, the sealing piston 21 is fixed to the third center tube 12 by the sealing pin 22, and the second stabilizing pin 26 fixes the upper vertebral body 25 and the slip sleeve 27 together. Sequentially, the circlip seat 20, the circlip 19, the circlip retaining ring 18, the second locking block 17, and the salvage joint 8 are sleeved on the outside of the third center tube 12 from the right end, the second locking block 17 fixes the circlip 19 to the third center tube 12 through the circlip retaining ring 18, and the salvage joint 8 fixes the third center tube 12 to the salvage joint 8 through the unsealing pin 16, the circlip sleeve 10 is threadedly connected to the setting piston 21, the circlip sleeve 10 is threadedly connected to the second back cap 9, the second center tube 11 is inserted into the third center tube 12, the second center tube 11 and the third center tube 12 are fixed together with the first locking block 13, and the sealing plug 36 is fixed. Insert the first locking block 13, thread the release block 35 to the second center tube 11, fix the third center tube 12 to the second center tube 11 with the first stabilizing pin 14, fix the second center tube 11 to the sealing plug 36 with the release pin 15, thread the second center tube 11 to the first center tube 4, sequentially mount the seating sleeve 5, fixed piston 6, sliding piston 7, and first back cap 3 on the outside of the first center tube 4, thread the first center tube 4 to the fixed piston 6, thread the seating sleeve 5 to the first back cap 3, and thread the upper joint 1 to the first center tube 4 and the sleeve 2, respectively.
[0021] Working principle and features of the present invention: The upper end of the high-pressure long-acting retrievable bridge plug of this embodiment is connected to the oil pipe, and the lower part is connected to the tail pipe and the wire plug, which is placed in the casing. The inner diameter of the casing is 124mm, and the outer diameter of the high-pressure long-acting retrievable bridge plug is 114mm. The tool can be smoothly lowered into the well.
[0022] Sealing: Pressurize the oil pipe, the liquid enters the first center tube 1 and enters the fixed piston 6 and the sliding piston 7 through the liquid inlet hole, pushing the sealing sleeve 5 to cut off the sealing pin 22, and the sealing piston 21 pushes the side rubber tube 23, the rubber tube 33 and the slip 29 to move downward to complete the sealing, and the retaining spring 19 is stuck on the retaining spring seat 20 to prevent the rubber tube from retracting. Continue to pressurize, cut off the second stable 15 release pin, move the sealing plug 36 downward, give up the position of the first locking block 13, and move the first locking block 13 horizontally to complete the release. If unsealing is required, the outer salvage tube 38 is screwed to the external thread of the salvage joint 8, and the salvage joint 8 is lifted by the outer salvage tube 38 to cut off the unsealing pin 16, and the second locking block 17 moves horizontally, and the third center tube 12 and the retaining spring ring 18 are displaced to complete the unsealing.
[0023] The second unsealing method: the threaded inner fishing 39 is screwed to the internal thread of the salvage joint 8, and the salvage joint 8 is lifted up by the threaded inner fishing 39 to cut off the unsealing pin 16, the second locking block 17 moves horizontally, and the third center tube 12 and the retaining ring 18 are displaced to complete the unsealing.
[0024] The third unsealing method: a reverse thread is provided in the connection between the third central tube 12 and the lower joint 32. The inner diameter of the third central tube is salvaged by using a 48 double slider, and the pipe column is rotated forward to unscrew the threads of the third central tube 12 and the lower joint 32 to complete the unsealing. The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.
Claims
1. A high-pressure, long-lasting, salvageable bridge plug, characterized in that: It comprises an upper joint, the upper joint is externally threaded with a protective sleeve, the upper joint is internally threaded with a first central tube, a first back cap and a seat sleeve are arranged on the outer surface of the first central tube, and the first back cap is threadedly connected with the seat sleeve. The first center tube is threadedly connected to the second center tube, and the fixed piston and the sliding piston inserted into the seating sleeve are also sleeved outside the first center tube at the same time, and the fixed piston is threadedly connected to the first center tube, and the sliding piston can be slidably sleeved between the seating sleeve and the center tube, and the other end of the seating sleeve is pressed against one end of the second back cap, and the second back cap is threadedly connected to the retaining spring sleeve, and the salvage joint inserted in the retaining spring sleeve is sleeved outside the first center tube and the third center tube, and the third center tube is sleeved outside the second center tube, and the sealing plug inserted inside the second center tube corresponds to the position of the first locking block, the first locking block is limited, and the second center tube is fixed to the sealing plug by the release pin; the second center tube and the third center tube are positioned by the first locking block, the first stabilizing pin fixes the third center tube to the second center tube, the salvage joint is fixedly connected to the third center tube by the unsealing pin, the sealing plug of the second center tube is fixed to the second center tube by the release pin, and the release stopper inserted in the second center tube is threadedly connected to the second center tube; The circlip sleeve is threadedly connected to the sealing piston, and the sealing piston is fixedly connected to the third center tube through the sealing pin; the salvage joint is connected to the third center tube through the unsealing pin, and the second locking block inserted in the salvage joint positions the salvage joint, the third center tube and the circlip retaining ring inserted into the salvage joint and sleeved outside the third center tube. A circlip seat is provided outside the circlip retaining ring, and the circlip seat is threaded outside the third center tube. A circlip is provided between the circlip retaining ring and the circlip seat, and the circlip retaining ring presses the circlip against the circlip seat; the second locking block and the circlip retaining ring are inserted into the right side of the salvage joint in turn, and the second locking block is inserted into the circlip retaining ring to lock the position of the circlip retaining ring and the third center tube, and the circlip retaining ring simultaneously locks the circlip in the existing position without moving; The fourth center tube is sleeved on the outer diameter of the third center tube, and the sealing piston is connected to the third center tube through a sealing pin, and the fourth center tube inserted into one side of the sealing piston is threadedly connected to the sealing piston; a side rubber tube, a spacer ring, a middle rubber tube, another spacer ring and a side rubber tube are sleeved on the outside of the fourth center tube in sequence, the fourth center tube is outer-connected with the upper vertebral body and fixedly connected to the upper cone, the upper vertebral body is outer-connected with the slip sleeve and the two are fixed together through the second stabilizing pin, the lower vertebral body is inserted into the other end of the slip sleeve and fixed through an adjusting ring connected to the slip sleeve, and the adjusting ring is sleeved on the outside of the lower vertebral body; slips and springs are arranged in the slip sleeve, the slip sleeve is between the upper vertebral body, the slip sleeve and the lower vertebral body, the slip is embedded in the slip sleeve, the spring is clamped between the slip and the slip sleeve, the elastic force generated by the spring separates the slip from the slip sleeve when going down the well, the slip is tightly attached to the third center tube, the lower joint is threadedly connected to the third center tube, and the lower vertebral body is threadedly connected to the lower joint.
2. The high-pressure long-lasting bridge plug according to claim 1 is characterized in that The cava is an integrally formed structure, including a first cava tooth and a second cava tooth symmetrically arranged, a transverse groove is provided between the first cava tooth and the second cava tooth, sharp teeth are provided on the first cava tooth and the second cava tooth respectively, a spring mounting hole is provided on the transverse groove, and empty knives are provided at corresponding positions of the first cava tooth and the second cava tooth respectively.
3. The high-pressure long-lasting bridge plug according to claim 2 is characterized in that The angle of the sharp teeth is directional, one side of the sharp teeth forms an angle of 40° to 50° with the horizontal plane, and the top angle of the sharp teeth is a 90° right angle.
4. The high-pressure, long-lasting, salvageable bridge plug according to claim 1 is characterized in that: The salvage joint is provided with an external thread for being screwed with the outer salvage tube, and the salvage joint is lifted up by the outer salvage tube to realize unsealing.
5. The high-pressure, long-lasting, salvageable bridge plug according to claim 1 is characterized in that: The salvage joint is provided with an internal thread for screw connection with the threaded catch inner fishing, and the threaded catch inner fishing is utilized to unseal the upper lifting salvage joint.
6. The high-pressure, long-lasting, salvageable bridge plug according to claim 1, characterized in that: The inner diameter of the third central tube is provided with a reverse thread for threaded connection with the double sliders, and the third central tube and the lower joint thread are unscrewed by rotating the pipe column forward to achieve unsealing.