Unconventional horizontal well pumping bridge plug and perforation anti-slip device

Abstract

The present invention relates to the technical field of unconventional horizontal well cable pumping bridge plug and perforating technology, specifically an unconventional horizontal well pumping bridge plug and perforating anti-slip device. It is composed of a main body and an anti-slip component. The upper connecting short circuit slides and sleeves the stroke short circuit, the stroke short circuit is sequentially sleeved with the intermediate transition short circuit and the arm seat to form the main body; the convex teeth, anti-reverse arms, and pull rods are hinged in sequence to form the anti-slip component; the present invention can passively push out the convex teeth immediately when the pump is stopped in the upward horizontal section, lock the joint pipe column on the casing wall to prevent slipping, and the convex teeth can be immediately pulled back by lifting the cable normally to release the lock. It has the characteristics of high safety and reliability, easy implementation, and low manufacturing cost.

Description

Technical Field

[0001] The invention relates to the technical field of unconventional horizontal well cable pumping bridge plug and perforation, and in particular to an unconventional horizontal well pumping bridge plug and perforation anti-slip device. Background Art

[0002] With the continuous deepening of shale gas exploration and development in Fuling, the wellbore structure has become more and more complex. The horizontal section length of some wells has reached more than 2000m, and the well inclination has reached more than 110°, which has brought great challenges to the safe construction of cable pumping bridge plug perforation. In the upturned horizontal section, the pumping bridge plug perforation construction is carried out. Due to the large well inclination, it is easy to cause the joint pipe string to slide down after stopping the pump, causing the cable and the shaped perforating bullet in the perforating gun to overlap. During the perforation process, the cable is affected by the explosion wave and breaks, causing engineering accidents.

[0003] At present, the domestic method for this problem is generally to stop the pumping and then continue pumping at a small displacement before perforating. However, this method has obvious defects. The downhole joint string may have slipped at the moment of stopping the pumping. Based on the experience of a large number of pumping in the past, in the static state of the horizontal upturned section, the thrust of small displacement pumping is far from enough to push the joint string. If the displacement is increased, it is difficult to determine how much displacement is needed, and there is a great risk of pumping out. Therefore, a more effective solution needs to be found.

[0004] In view of the above problems, the present invention designs an unconventional horizontal well pumping bridge plug and perforation anti-slip device, which adopts the passive mechanical principle to prevent the linked pipe string from sliding down at the moment of pumping, and actively unlocks the lifting cable. No similar public reports were found through inquiries of relevant technical documents and patents at home and abroad. Summary of the invention

[0005] The present invention aims at the problems existing in the prior art and provides an unconventional horizontal well pumping bridge plug and perforation anti-slip device.

[0006] The technical solution is as follows:

[0007] An unconventional horizontal well pumping bridge plug and perforating anti-slip device comprises an upper connecting short circuit, a stroke short circuit, an arm seat, a center shaft, a tie rod tray, a center spring pressure cap, a center spring, a center spring pressure ring, a tie rod, an anti-reverse arm, and a convex tooth. The upper connecting short circuit is provided with a center hole A; the center shaft is provided with a center hole B; the arm seat is provided with a receiving cavity for accommodating the tie rod, the anti-reverse arm, and the convex tooth, the upper end of the receiving cavity is fixedly provided with a center spring pressure cap, and the lower end of the receiving cavity is provided with a center hole C; the upper connecting short circuit is slidably sleeved on the stroke short circuit; the stroke short circuit is sleeved on the arm seat; one end of the center shaft is fixedly connected to the center hole A , the other end extends into the accommodating cavity, and the center holes A, B, and C are connected in sequence; the pull rod tray, the center spring pressure cover, the center spring, and the center spring pressure ring are sequentially sleeved on the center axis from top to bottom, the pull rod tray is fixedly connected to the center axis, the center spring pressure cover is slidingly matched with the center axis, and the center spring pressure ring is fixedly connected to the center axis; a plurality of convex tooth grooves are arranged around the accommodating cavity, one end of the convex tooth is hinged in the convex tooth groove, and the other end is hinged to the anti-reverse arm and the pull rod in sequence; the pull rod passes through the center spring pressure cover, the pull rod tray and the pull cap from bottom to top and is fixedly connected, and the pull cap and the pull rod tray are limitedly matched.

[0008] Furthermore, it also includes a stroke cylindrical screw, a stroke groove, and a stroke screw hole. The stroke short-circuit is a cylindrical structure with a plurality of stroke grooves arranged circumferentially. The stroke cylindrical screw passes through the stroke groove and is threadedly connected to the stroke screw hole on the upper connecting short-circuit. The stroke cylindrical screw and the stroke groove are slidably matched. It also includes an intermediate transition short-circuit. The stroke short-circuit is sequentially sleeved on the intermediate transition short-circuit and the arm seat. It also includes an upper spring pressure cover and an upper spring. The upper spring pressure cover is fixedly mounted on the upper end of the intermediate transition short-circuit and slidably sleeved on the central axis. The upper spring is respectively connected to the upper spring pressure cover and the pull cap. An upper sealing ring is arranged between the stroke short-circuit and the intermediate transition short-circuit. A lower sealing ring is arranged between the intermediate transition short-circuit and the arm seat.

[0009] Furthermore, the travel screw hole coincides with the travel groove. The convex tooth groove, the travel groove and the pull rod are all arranged in pairs. The pull rod tray is provided with a through hole for accommodating the pull rod and the central shaft to pass through. The through hole for accommodating the pull rod to pass through has a clearance fit with the pull rod, and the through hole for accommodating the central shaft to pass through has an interference fit with the central shaft. The pull cap is cylindrical, one end of which is fixedly connected to the pull rod, and the other end is fixedly connected to the upper spring. The diameter of the pull cap is larger than the diameter of the through hole on the pull rod tray for accommodating the pull rod to pass through.

[0010] The beneficial effects of the present invention are:

[0011] The invention can passively push out the convex teeth immediately when the pump stops in the upward horizontal section, lock the joint pipe string on the casing wall to prevent it from sliding down, and pull the cable up normally to immediately pull back the convex teeth to release the lock. It has the characteristics of high safety and reliability, easy implementation and low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the present invention;

[0013] In the figure: arm seat 1, convex teeth 2, anti-reverse arm 3, pull rod 4, center shaft 5, center shaft spring pressure ring 6, lower spring 7, center shaft spring pressure cover 8, lower pressure cover set screw 9, pull rod tray 10, upper spring 11, lower sealing ring 12, upper sealing ring 13, upper spring pressure cover 14, travel short circuit 15, upper pressure cover set screw 16, travel cylindrical screw 17, upper connecting short circuit 18, intermediate transition short circuit 19, center hole A 20, center hole B 21, center hole C 22, pull cap 23. DETAILED DESCRIPTION

[0014] Please refer to the attached Figure 1 An unconventional horizontal well pumping bridge plug and perforating anti-slip device consists of an arm seat 1, a convex tooth 2, an anti-reversal arm 3, a pull rod 4, a center shaft 5, a center shaft spring pressure ring 6, a lower spring 7, a center shaft spring pressure cover 8, a lower pressure cover set screw 9, a pull rod tray 10, an upper spring 11, a lower sealing ring 12, an upper sealing ring 13, an upper spring pressure cover 14, a travel short circuit 15, an upper pressure cover set screw 16, a travel cylindrical screw 17, an upper connecting short circuit 18, an intermediate transition short circuit 19, a center hole A 20, a center hole B 21, a center hole C 22, and a pull cap 23.

[0015] The upper end of the arm seat 1 is provided with a male thread and a lower sealing ring 12, the lower end is provided with a female thread, four grooves are evenly arranged around the body, a chamber is arranged on the inner side of the upper end, and a small round hole is opened in the center of the inner side of the lower end.

[0016] The protruding tooth 2 is fixed on the inner side of the lower end of the groove of the arm seat 1, the anti-falling arm 3 is connected to the protruding tooth 2 by a screw, the pull rod 4 is connected to the anti-falling arm 3 by a screw, and the pull rod 4 passes through the central axis spring pressure cover 8 and the pull rod tray 10.

[0017] The central axis spring pressure cover 8 is fixed to the inner side of the upper end of the arm seat 1 by two lower pressure cover fixing screws 9 and is flush with the upper end surface of the arm seat 1.

[0018] A pull cap 23 is disposed at the upper end of the pull rod 4 , and the pull cap 23 cannot pass through the pull rod tray 10 .

[0019] The central axis spring pressure cover 8 and the tie rod tray 10 are provided with five circular holes, through which four tie rods 4 and one central axis 5 can pass.

[0020] The central axis 5 is arranged in an inverted T shape, with a male thread at the upper end and a circular hole at the inner side. The central axis spring pressure ring 6 and the lower spring 7 are inserted from the upper end to the lower end in sequence, and pass through the central axis spring pressure cover 8, the pull rod tray 10 and the upper spring pressure cover 14.

[0021] The upper spring 11 is arranged between the pull rod 4 and the upper spring pressure cover 14, and is connected up and down, with a total of four.

[0022] The upper spring pressure cover 14 is fixed to the upper end surface of the intermediate transition short-circuit 19 by means of the upper pressure cover set screws 16 and is connected to the upper spring 11 . A circular hole is arranged in the middle, through which the central axis 5 can pass.

[0023] The upper end of the intermediate transition short-circuit 19 is provided with a male thread and an upper sealing ring 13, the lower end is provided with a female thread, four grooves are provided on the middle outer side of the body, and the lower end is connected to the upper end of the arm seat 1.

[0024] The upper end of the upper connecting short link 18 is provided with two male threads, and the lower end is evenly provided with four travel screw holes around a circle, a circular hole is provided inside, and a female thread is provided at the lower end of the hole, and is connected to the upper end of the central shaft 5.

[0025] The travel short-circuit 15 is a cylindrical structure, with four travel grooves evenly arranged around the outer side, and a female thread arranged at the lower end of the inner side, which is sleeved on the lower end of the upper connecting short-circuit 18 and the upper end of the intermediate transition short-circuit 19, and is connected with the male thread at the upper end of the intermediate transition short-circuit 19.

[0026] The travel cylindrical screws 17 pass through the travel grooves on the travel short-circuit 15 and are installed in the travel screw holes of the upper connecting short-circuit 18. There are four of them in total.

[0027] The assembly method of the present invention is as follows: the central axis 5 is sequentially inserted into the central axis spring pressure ring 6, the lower spring 7, the central axis spring pressure cover 8 and the pull rod tray 10, and is inserted from the upper end of the arm seat and fixed with the lower pressure cover set screw 9; the anti-reverse arm 3 is connected to the pull rod 4 by a screw rod, and passes through the central axis spring pressure cover 8 and the pull rod tray 10, the convex teeth 2 are connected to the inner side of the groove of the arm seat 1 by a screw rod, and are connected with the anti-reverse arm screw rod; the arm seat 1 is installed with a lower sealing ring 12, and a spring 11 is installed on each pull rod 4; the intermediate transition short circuit 19 is sleeved on the upper end of the arm seat 1, and the anti-reverse buckle top is used. Fix with screws; press the upper spring pressure cover 14 onto the upper end of the intermediate transition short-circuit 19, press the upper spring 11, and tighten and fix it with the upper pressure cover set screw 16; insert the upper connecting short-circuit 18 into the upper end of the central shaft 5 and tighten it. After installing the sealing ring 13 on the intermediate transition short-circuit 19, insert the travel short-circuit 15 into the upper connecting short-circuit 18 and the upper end of the intermediate transition short-circuit 19 The male threads are tightened and fixed with anti-backward top screws; rotate the upper connecting short-circuit 18 so that its stroke screw hole coincides with the stroke short-circuit groove, and install four stroke cylindrical screws 17 and tighten them. The assembly of the device is now completed.

[0028] The working principle of the present invention is: the cable is connected to the upper connecting short circuit 18 through a transition connecting short circuit, and passes through the central circular hole of the device. When the device is in the tensile stress stage, the upper connecting short circuit 18 pulls the central axis 5 upward, the pull rod tray 10 pulls the pull rod 4 upward, and the anti-reverse arm 3 pulls back the convex tooth 2, so that the outer end surface of the convex tooth 2 is lower than the outer plane of the arm seat 1; when the device is in the extrusion stress stage, the central axis 5 moves downward, the pull rod tray 10 pushes the pull rod 4 downward, and the anti-reverse arm 3 pushes out the convex tooth 2 and locks it on the casing wall. The greater the extrusion pressure, the tighter the lock, and the faster the extrusion, the tighter the lock. By adopting this technical solution, at the moment of stopping the pump in the upward horizontal section, if the joint pipe string has a downward trend, it will immediately enter the extrusion stress stage, and the convex tooth 2 will be passively pushed out and locked on the casing wall to prevent further downward sliding; the normal lifting of the cable can make the device immediately converted into the tensile stress stage, pull back the convex tooth 2, and release the lock.

Claims

1. Unconventional horizontal well pumping bridge plug and perforation anti-slip device, characterized in that: It includes an upper connecting short circuit, a travel short circuit, an arm seat, a center shaft, a pull rod tray, a center spring pressure cover, a center spring, a center spring pressure ring, a pull rod, an anti-reverse arm, a convex tooth, an upper spring pressure cover, and an upper spring. The upper connecting short circuit is provided with a center hole A; the center shaft is provided with a center hole B; the arm seat is provided with a receiving cavity for accommodating the pull rod, the anti-reverse arm, and the convex tooth, the upper end of the receiving cavity is fixedly provided with a center spring pressure cover, and the lower end of the receiving cavity is provided with a center hole C; the upper connecting short circuit is slidably sleeved on the travel short circuit; the travel short circuit is sleeved on the arm seat; one end of the center shaft is fixedly connected to the center hole A, and the other end extends into the accommodating cavity, and the center holes A, B, and C are connected in sequence; the pull rod tray, the center spring pressure cover, the center spring, the center The spring pressure ring is sequentially sleeved on the central axis from top to bottom, the pull rod tray is fixedly connected to the central axis, the central spring pressure cover is slidably matched with the central axis, and the central spring pressure ring is fixedly connected to the central axis; a plurality of convex tooth grooves are arranged around the accommodating cavity, one end of the convex tooth is hinged in the convex tooth groove, and the other end is hinged to the anti-reverse arm and the pull rod in sequence; the pull rod passes through the central spring pressure cover, the pull rod tray and the pull cap from bottom to top and is fixedly connected, and the pull cap is limitedly matched with the pull rod tray; the upper spring is respectively connected to the upper spring pressure cover and the pull cap; the upper spring pressure cover is slidably sleeved on the central axis; the upper spring pressure cover is fixed to the upper end face of the middle transition short-circuit by the upper pressure cover fixing screws, and is connected to the upper spring, and a circular hole is arranged in the middle to pass the central axis.

2. The unconventional horizontal well pumping bridge plug and perforation anti-slip device according to claim 1 is characterized in that: It also includes a stroke cylindrical screw, a stroke groove, and a stroke screw hole. The stroke short circuit is a cylindrical structure with a plurality of stroke grooves arranged circumferentially. The stroke cylindrical screw passes through the stroke groove and is threadedly connected with the stroke screw hole on the upper connecting short circuit. The stroke cylindrical screw and the stroke groove are slidably matched.

3. The unconventional horizontal well pumping bridge plug and perforation anti-slip device according to claim 2 is characterized in that: It also includes an intermediate transition short circuit, and the travel short circuit is sleeved with the intermediate transition short circuit and the arm seat in sequence.

4. The unconventional horizontal well pumping bridge plug and perforation anti-slip device according to claim 3 is characterized in that: An upper sealing ring is arranged between the travel short circuit and the intermediate transition short circuit.

5. The unconventional horizontal well pumping bridge plug and perforation anti-slip device according to claim 3 or 4, characterized in that: A lower sealing ring is arranged between the intermediate transition short-circuit and the arm seat.

6. The unconventional horizontal well pumping bridge plug and perforation anti-slip device according to claim 5, characterized in that: The travel screw hole coincides with the travel groove.

7. The unconventional horizontal well pumping bridge plug and perforation anti-slip device according to claim 6, characterized in that: The convex tooth grooves, travel grooves and pull rods are all arranged in pairs.

8. The unconventional horizontal well pumping bridge plug and perforation anti-slip device according to claim 7, characterized in that: The pull rod tray is provided with a through hole for accommodating the pull rod and for the central shaft to pass through. The through hole for accommodating the pull rod to pass through is clearance-matched with the pull rod, and the through hole for accommodating the central shaft to pass through is interference-matched with the central shaft.

9. The unconventional horizontal well pumping bridge plug and perforation anti-slip device according to claim 8, characterized in that: The pull cap is cylindrical, one end of which is fixedly connected to the pull rod, and the other end of which is fixedly connected to the upper spring. The diameter of the pull cap is larger than the diameter of the through hole on the pull rod tray through which the pull rod passes.

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