Coupling positioning anchor device

Abstract

The invention relates to a coupling positioning and anchoring device, comprising an upper joint, a salvage joint, an outer sleeve, a lower center pipe, a fixed piston, a shift fork, a slip tile, a main body, a lower working cylinder and a lower joint; the upper joint is sleeved with a piston I, a locking block is arranged between the salvage joint and the lower center pipe; the salvage joint and the fixed piston are provided with an unsealing ring, the unsealing ring is sleeved with the lower center pipe, the front part of the unsealing ring is placed between the end of the salvage joint and the lower center pipe and is provided with a steel ball I, the shift fork comprises a shift fork I and a shift fork II, the middle inner wall of the main body is sleeved with the lower center pipe, and the slip tile is connected to the main body through a pin shaft; the slip tile is provided with a plurality of grooves near the inner wall of the lower center pipe, and an end protrusion is provided near the pin shaft; the device is anchored in the casing coupling seam and positioned accurately, the slip tile has no hard teeth and will not cause damage to the inner wall of the casing, thereby improving the success rate of salvage.

Description

Technical Field

[0001] The invention relates to the field of oil well equipment, in particular to a coupling positioning anchoring device. Background Art

[0002] At present, the anchoring parts of tools such as tubing anchors or hand-free packers used in pumping wells mostly use hydraulic pressure or downward pressure to displace the slips, and the one-way teeth on the slips are embedded in the inner wall of the casing to achieve anchoring. The hardness of the teeth on the slips is higher than that of the inner wall of the casing, and it is easy to leave tooth marks on the inner wall of the casing during the working process, which is easy to cause casing damage, affect the production of the oil well, shorten the service life of the oil well, reduce the output of the oil well, and cause significant economic losses. Summary of the invention

[0003] In order to make up for the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a coupling positioning and anchoring device, which is anchored in the casing coupling seam and accurately positioned. The slip piece has no hard teeth and will not cause damage to the inner wall of the casing, thereby improving the success rate of salvage.

[0004] The object of the present invention is achieved through the following technical scheme: a coupling positioning anchoring device, comprising an upper joint, a salvage joint, an outer sleeve, a lower center pipe, a fixed piston, a shift fork, a slip sheet, a main body, a lower working cylinder, and a lower joint; a spring is provided between the lower working cylinder and the lower center pipe, and the front end of the lower joint is externally threadedly connected to the lower end of the lower working cylinder; the technical key points are:

[0005] The upper joint is sleeved with a piston I, and the piston I is fixedly connected to the upper joint by a pin I; the salvage joint is sleeved on the lower part of the upper joint, and the claw-shaped protrusion of the upper joint is placed between the salvage joint and the piston I; the lower part of the salvage joint is sleeved with a lower center pipe and fixedly connected by a pin II; a locking block is provided between the salvage joint and the lower center pipe; the fixed piston is placed below the salvage joint, and the salvage joint and the fixed piston are provided with an unsealing ring, which is sleeved on the lower center pipe, and the front part of the unsealing ring is placed between the end of the salvage joint and the lower center pipe and is provided with a steel ball I, and the steel ball I is embedded between the unsealing ring and the lower center pipe;

[0006] The fixed piston is threadedly connected to the lower center tube, and a retaining ring is provided at the front of the fixed piston, and a triangular bevel tooth I is provided on the retaining ring; the shift fork includes a shift fork I and a shift fork II, and the shift fork I is placed under the fixed piston, sleeved on the lower center tube, and fixedly connected with the pin III; the shift fork I and the shift fork II are fixedly connected by a connecting rod; the outer sleeve sleeves the lower part of the salvage joint, the unsealing ring, the fixed piston, and is connected to the front of the shift fork I, and an annular groove and a triangular bevel tooth II are provided on the inner side of the outer sleeve, and the triangular bevel tooth II can mesh with the triangular bevel tooth I; the inner wall of the middle of the main body sleeves the lower center tube The front end of the main body is covered with a shift fork I, and the lower end of the main body is connected to the front end of the lower working cylinder; the cava piece is connected to the main body through a pin shaft; the shift fork II is placed in the working cylinder and covered with the lower center tube, the upper end of the spring supports the lower end surface of the shift fork II, and the lower end supports the lower joint; the cava piece is provided with a groove near the inner wall of the lower center tube, and an end protrusion is provided near the pin shaft, the top of the front end head II of the shift fork II is placed between the end protrusion of the cava piece and the lower center tube, the front end head II of the shift fork II is a trapezoidal block and is provided with an inclined surface, and the inclined surface of the front end head contacts the arc surface on the inner side of the end protrusion of the cava piece.

[0007] Furthermore, the front end of the fork I is provided with two heads I, and the top of the head I is provided with a conical slope; the fork II is provided with two front end heads II; the cava pieces are two and arranged end to end, and two diamond grooves are provided on the inner wall near the lower center tube.

[0008] Furthermore, the inner wall of the piston I is provided with a chamfered surface. After the seating process of the coupling positioning and anchoring device is completed, a steel ball II is thrown into the oil pipe from the ground, and the steel ball II falls onto the chamfered surface at the upper end of the piston I to form a line seal therewith. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A schematic diagram of the structure of the coupling positioning anchoring device;

[0010] Figure 2 This is a schematic diagram of the connections of the various structures inside the jacket of this device;

[0011] Figure 3 It is a connection diagram of the main structure of the device;

[0012] Figure 4 for Figure 1 Middle AA section;

[0013] Figure 5 for Figure 1 Middle BB section;

[0014] Figure 6 It is a schematic diagram of the structure of fork I;

[0015] Figure 7 It is the structural schematic diagram of fork II;

[0016] Figure 8 It is a schematic diagram of the connection structure of fork I, fork II and slip plate;

[0017] Fig. 9 This is a schematic diagram of the connection between steel ball II and piston I.

[0018] Figure 1-Figure 9 , the specific names of the structures are: upper joint 1, claw-shaped protrusion 1-1, pin Ⅰ2, piston Ⅰ3, salvage joint 4, upper groove hole Ⅰ4-1, outer sleeve 5, annular groove 5-1, triangular oblique tooth Ⅱ5-2, locking block 6, lower center tube 7, lower groove hole Ⅰ7-1, lower groove hole Ⅱ7-2, pin Ⅱ8, unsealing ring 9, upper groove hole Ⅱ9-1, steel ball 10, retaining ring 11, triangular oblique tooth Ⅰ11-1, fixed piston 12, retaining ring groove 12-1, pin Ⅲ13, shift fork Ⅰ14, head Ⅰ14-1, cava sheet 15, diamond groove 15-1, end protrusion 15-2, connecting rod 16, hexagon socket bolt Ⅰ17, pin shaft 18, main body 19, hexagon socket bolt Ⅱ20, shift fork Ⅱ21, head Ⅱ21-1, lower working cylinder 22, spring 23, lower joint 24, steel ball Ⅱ25, oil pipe 26. DETAILED DESCRIPTION

[0019] See Figure 1-Figure 9 The specific structure of this embodiment is: a coupling positioning and anchoring device, including an upper joint 1, a salvage joint 4, a jacket 5, a lower center pipe 7, a fixed piston 12, a shift fork, a slip sheet 15, a main body 19, a lower working cylinder 22, and a lower joint 24;

[0020] The upper joint 1 is sleeved with a piston Ⅰ3, and the piston Ⅰ3 is fixedly connected to the upper joint 1 through a pin Ⅰ2; the salvage joint 4 is sleeved on the lower part of the upper joint 1, and the claw-shaped protrusion 1-1 of the upper joint 1 is placed between the salvage joint 4 and the piston Ⅰ3;

[0021] The lower part of the salvage joint 4 is sleeved with the lower center tube 7 and fixedly connected by the pin II 8; the salvage joint 4 and the lower center tube 7 are respectively provided with an upper groove hole I4-1 and a lower groove hole I7-1, and form a lock hole groove I, and a locking block 6 is provided in the lock hole groove I, and the locking block 6 is embedded in the upper 4-1 and lower groove holes I7-1 of the salvage joint 4 and the lower center tube 7, and is locked by clamping;

[0022] The fixed piston 12 is placed below the salvage joint 4, and an unsealing ring 9 is provided between the salvage joint 4 and the fixed piston 12. The unsealing ring 9 is sleeved on the lower center tube 7, and the front part of the unsealing ring 9 is placed between the end of the salvage joint 4 and the lower center tube 7. The front part of the unsealing ring 9 and the lower center tube 7 are respectively provided with an upper groove hole II9-1 and a lower groove hole II7-2, and form a lock hole groove II. A steel ball 10 is provided in the lock hole groove II, and the steel ball 10 is embedded in the upper and lower groove holes II of the unsealing ring 9 and the lower center tube 7, and is clamped and locked; the rear part of the unsealing ring 9 is placed between the salvage joint 4 and the fixed piston 12;

[0023] The fixed piston 12 is threadedly connected to the lower center tube 7. A retaining ring groove 12-1 is provided at the front of the fixed piston 12. A retaining ring 11 is provided in the retaining ring groove. A triangular helical tooth Ⅰ11-1 is provided on the retaining ring 11.

[0024] The shift fork comprises a shift fork I 14 and a shift fork II 21. The shift fork I 14 is placed below the fixed piston 12, is sleeved on the lower center tube 7, and is fixedly connected to the pin III 13.

[0025] The outer sleeve 5 is mounted on the lower part of the salvage joint 4, the unsealing ring 9, the fixed piston 12, and is threadedly connected to the front part of the fork I 14. The inner side of the outer sleeve 5 is provided with an annular groove 5-1 and a triangular bevel tooth II 5-2, and the triangular bevel tooth II 5-2 can mesh with the triangular bevel tooth I 11-1;

[0026] The inner wall of the middle of the main body 19 is sleeved with the lower center tube 7, the front end of the main body 19 is sleeved with the shift fork Ⅰ14 and slidably connected, and the lower end of the main body 19 is threadedly connected with the front end of the lower working cylinder 22; the slip sheet 15 is connected to the main body 19 through two pins 18, and the pins 18 and the main body 19 are connected through the hexagon socket bolts Ⅱ20, and the hexagon socket bolts Ⅱ20 are threadedly connected to the main body 19;

[0027] The shift fork II 21 is placed in the working cylinder 22 and is sleeved on the lower center tube 7. A spring 23 is provided between the lower working cylinder 22 and the lower center tube 7. The spring 23 is sleeved on the lower center tube 7 of the main body. The upper end of the spring 23 supports the lower end surface of the shift fork II 21, and the lower end supports the lower joint 24. The front end of the lower joint 24 is externally threadedly connected to the lower end of the lower working cylinder 22.

[0028] The shift fork I 14 and the shift fork II 21 are fixedly connected by two connecting rods 16; the connecting rod 16 is threadedly connected to the shift fork I 14, and the other end of the connecting rod 16 is connected to the shift fork II 21 by a hexagon socket bolt I 17;

[0029] There are two slip tiles 15 arranged end to end, and a diamond-shaped groove 15-1 is provided on the inner wall of the slip tile 15 close to the lower central tube 7, and two end protrusions 15-2 are provided near the two pins 18, and a curved surface H is provided on the inner side of the end protrusions 15-2;

[0030] The front end of the shift fork Ⅰ14 is provided with two triangular cone-shaped heads Ⅰ14-1, and the heads Ⅰ14-1 are provided with a conical inclined surface E; the shift fork Ⅱ21 is provided with two front end heads Ⅱ21-1; the front end head Ⅱ21-1 of the shift fork Ⅱ is a trapezoidal block and is provided with a trapezoidal inclined surface D, and the trapezoidal inclined surface D is placed on the outside; when the shift fork Ⅰ14 moves downward, the top end of the front end head Ⅰ14-1 is inserted into the groove 15-1 inside the tile piece; the top end of the front end head Ⅱ21-1 of the shift fork Ⅱ21 is placed between the protrusion 15-2 at the end of the tile piece 15 and the lower center tube 7, and the trapezoidal inclined surface D of the front end head Ⅱ21-1 of the shift fork Ⅱ21 contacts the convex arc surface H at the end of the tile piece 15;

[0031] The inner wall of the piston I3 is provided with a chamfered surface J. After the clamping process of the coupling positioning and anchoring device is completed, a steel ball II25 is thrown from the ground into the oil pipe 26, and the steel ball II25 falls on the chamfered surface J on the upper end of the piston I3 to form a line seal therewith.

[0032] Working principle of this device:

[0033] After the tool is connected to the tubing 26 or other tools, it is delivered to a depth above the joint of the jammed casing according to the construction requirements. The pin III 13 is sheared off by pressurizing the tubing 26, and the fork I 14 moves downward together with the outer sleeve 5. The tapered slope at the lower end of the fork I 14 opens the tile piece 15 and presses it against the inner wall of the casing. The pipe column is slowly lowered to allow the tile piece 15 to enter the joint of the casing. At the same time, as the outer sleeve 5 moves downward, the annular groove 5-1 of the outer sleeve 5 moves to the top of the locking block 6 to complete the unlocking; at the same time, the triangular bevel teeth II 5-2 inside the outer sleeve 5 mesh with the triangular bevel teeth I 11-1 on the outer surface of the retaining spring 11 to complete the seat clamping.

[0034] After the seating process is completed, a steel ball II25 is thrown into the oil pipe on the ground, and the steel ball II25 falls to the chamfer J at the upper end of the piston I3 to form a line seal with it. At this time, pressure is applied to the oil pipe to cut off the pin I2, and the piston 3 moves downward to unlock the limit between the upper joint 1 and the salvage joint 4, and the oil pipe is lifted up to complete the release.

[0035] Lift the pipe column with the fishing tool, cut the pin II 8, unlock the fishing joint 4 and the lower center pipe 7, and the fishing joint 4 moves upward to drive the outer sleeve 5 and the fork I 14 upward. Since the connecting rod 16 is connected between the fork I 14 and the fork II 21, the fork I 14 moves upward while the fork II 21 moves upward under the action of the spring 23, and the slip sheet 15 is retracted to complete the fishing.

[0036] The structural features of this device:

[0037] (1) The tool is anchored in the casing coupling seam and positioned accurately. The slip piece 15 has no hard teeth and will not cause damage to the inner wall of the casing.

[0038] (2) The unsealing ring 9 is embedded with a steel ball 10 so that the reverse force for opening the slip sheet 15 does not act directly on the pin II 8 but on the stop surface C at the lower end of the salvage joint 4.

[0039] (3) The conical inclined surface E on the shift fork I 14 moves downward to open the tile piece 15, so that it is anchored in the casing coupling seam; when going down the well, the inclined surface D on the upper end of the shift fork II 21 restricts the arc surface H of the tile piece 15 from rotating along the pin shaft 18, thereby ensuring that the tile piece 15 is not opened prematurely.

[0040] (4) During salvage, the connecting rod 16 connects the fork I 14 and the fork II 23 to achieve synchronous movement. When lifting the pipe string, the upper end inclined surface D of the fork II 21 contacts the arc surface H of the tile piece 15, forcing the tile piece 15 to rotate along the pin shaft 18 to ensure the success rate of salvage.

Claims

1. A coupling positioning and anchoring device, comprising an upper joint, a salvage joint, an outer sleeve, a lower center pipe, a fixed piston, a shift fork, a slip sheet, a main body, a lower working cylinder, and a lower joint; a spring is provided between the lower working cylinder and the lower center pipe, and the front end of the lower joint is externally threadedly connected to the lower end of the lower working cylinder; the characteristics are: The upper joint is sleeved with a piston I, and the piston I is fixedly connected to the upper joint by a pin I; the salvage joint is sleeved on the lower part of the upper joint, and the claw-shaped protrusion of the upper joint is placed between the salvage joint and the piston I; the lower part of the salvage joint is sleeved with a lower center pipe and fixedly connected by a pin II; a locking block is provided between the salvage joint and the lower center pipe; the fixed piston is placed below the salvage joint, and the salvage joint and the fixed piston are provided with an unsealing ring, which is sleeved on the lower center pipe, and the front part of the unsealing ring is placed between the end of the salvage joint and the lower center pipe and is provided with a steel ball I, and the steel ball I is embedded between the unsealing ring and the lower center pipe; The fixed piston is threadedly connected to the lower center tube, and a retaining ring is provided at the front of the fixed piston, and a triangular oblique tooth I is provided on the retaining ring; the shift fork includes a shift fork I and a shift fork II, and the shift fork I is placed under the fixed piston, and the shift fork I is sleeved on the lower center tube and fixedly connected by a pin III; the shift fork I and the shift fork II are fixedly connected by a connecting rod; the outer sleeve is sleeved on the lower part of the salvage joint, the unsealing ring, the fixed piston, and is connected to the front of the shift fork I, and an annular groove and a triangular oblique tooth II are provided on the inner side of the outer sleeve, and the triangular oblique tooth II can mesh with the triangular oblique tooth I; the inner wall of the middle part of the main body is sleeved on the lower center tube, and the shift fork I is sleeved on the front end of the main body, and the lower end of the main body is connected to the front end of the lower working cylinder; the card tile is connected to the main body by a pin shaft; The fork II is placed in the lower working cylinder and is sleeved on the lower center tube. The upper end of the spring supports the lower end surface of the fork II and the lower end supports the lower joint. The front end of the fork I is provided with two heads I, and the top of the head I is provided with a conical inclined surface. There are two clapboards arranged end to end. The clapboards are provided with two rhombus-shaped grooves near the inner wall of the lower center tube, and the clapboards are provided with an end protrusion near the pin shaft. The fork II is provided with two front end heads II, and the top of the front end head II of the fork II is a trapezoidal block and is provided with an inclined surface. The top of the front end head II is placed between the end protrusion of the clapboard and the lower center tube, and the inclined surface of the front end head II contacts the arc surface on the inner side of the end protrusion of the clapboard. When the fork I moves downward, the top of the head I is inserted into the rhombus-shaped groove inside the clapboard. The method for using the coupling positioning anchoring device is as follows: After the coupling positioning and anchoring device is connected to the oil pipe, it is sent to a depth above the joint of the clamped casing according to the construction requirements. The pin III is sheared off by pressurization in the oil pipe, and the shift fork I moves downward together with the outer sleeve. The tapered inclined surface at the lower end of the shift fork I opens the tile piece and presses it against the inner wall of the casing. The pipe column is slowly lowered to make the tile piece enter the joint of the casing coupling. At the same time, as the outer sleeve moves downward, the annular groove of the outer sleeve moves to the bottom of the locking block; at the same time, the triangular bevel teeth II inside the outer sleeve are meshed with the triangular bevel teeth I on the outer surface of the retaining spring to complete the seat clamping; After the seating process is completed, throw a steel ball II into the oil pipe on the ground. The steel ball II falls to the chamfer of the upper end of the piston I to form a line seal with it. At this time, pressurize the oil pipe to cut off the pin I. The piston I moves downward to unlock the limit between the upper joint and the salvage joint, and lift the oil pipe to complete the release. Lift the pipe column with the salvage tool, cut off the pin II, unlock the salvage joint and the lower center pipe, and move the salvage joint upward to drive the outer sleeve and fork I upward. Since a connecting rod is connected between fork I and fork II, fork I moves upward while fork II moves upward under the action of the spring, and the slip sheet is retracted to complete the salvage.

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