Double-channel packing type packer

Abstract

The utility model discloses a double-channel packing type packer, which relates to a special tool for construction of a cased well in the exploitation process of an oil and gas well, and aims to solve the problems that the construction cost and complexity are increased and the construction efficiency is reduced due to the fact that the construction of a tubular column becomes tedious and complicated, the double-channel packing type packer comprises a transposition mandrel, a packing sealing mandrel extending upwards is in threaded connection with the upper portion of the transposition mandrel, a packing sealing mechanism is arranged on one side of the packing sealing mandrel, and an anchoring friction transposition mechanism is arranged on one side of the transposition mandrel.

Description

Technical Field

[0001] The utility model relates to a special tool for constructing a casing well during the exploitation of an oil and gas well, in particular to a double-channel filling type packer. Background Art

[0002] During the exploration and development of oil and gas wells, testing, drainage, and pumping are all critical and common measures. Packers play a key role in these construction processes. They can effectively isolate the target layer from other layers, drilling fluid or well killing fluid, and are one of the important tools in downhole operations.

[0003] At present, domestic oil fields mainly use single-channel packers. However, this type of packer usually needs to be equipped with auxiliary tools such as reverse circulation valves and bypass valves during use to cope with different working scenarios and needs. These additional tools make the construction string cumbersome and complicated, and also increase the cost and complexity of construction, and reduce construction efficiency.

[0004] Therefore, although packers play an important role in oil and gas well operations, the additional tools currently provided with single-pass packers make operations less efficient. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present application is to provide a dual-channel packed packer, which adds a packed sealing channel on the basis of the existing inner diameter channel of the packer, aiming to solve the problem of cumbersome and complicated use of construction pipes, and increased construction costs and efficiency.

[0006] In order to solve the above technical problems, the utility model comprises a transposition mandrel, the upper part of the transposition mandrel is threadedly connected with a packing sealing mandrel extending upward, the outer periphery of the packing sealing mandrel is provided with a packing sealing mechanism, and the outer periphery of the transposition mandrel is provided with an anchoring friction transposition mechanism;

[0007] The packing sealing mechanism comprises a bypass outer cylinder, a packing box is threadedly connected to the lower part of the bypass outer cylinder, a packing pressure ring and a packing sealing ring are arranged inside the packing box, a sealing ring, an upper gauge ring, an end rubber cylinder, a sealing spacer ring, a middle rubber cylinder and a lower gauge ring are sequentially sleeved on the outer periphery of the packing box, and an opening limit ring is clamped at the lower part of the packing box;

[0008] The anchoring friction shifting mechanism includes a tooth plate cone, a fixed shear pin is passed through the outer periphery of the tooth plate cone, a tooth plate is tightly connected to the bottom of the tooth plate cone, a tooth plate seat is provided below the tooth plate, a shifting sleeve is hung below the tooth plate seat, two connected long and short shifting grooves are built in the shifting sleeve, a friction pad and a friction block body are sequentially provided at the outer lower end of the shifting spindle, and a leaf spring is provided on one side of the friction block body.

[0009] Preferably, the packing pressure ring and the packing sealing ring form a packing bypass assembly in the packing box and are hung on the packing sealing spindle step.

[0010] Preferably, a plurality of tungsten steel tooth blocks are welded on the tooth plate.

[0011] Preferably, a plurality of wear-resistant alloy blocks are provided on the friction pad.

[0012] Preferably, the fixed shear pin can be embedded in the annular groove of the packing seal spindle.

[0013] Preferably, the sealing ring, upper gauge ring, end rubber tube, sealing spacer ring, middle rubber tube and lower gauge ring are all fixed by an open limiting ring.

[0014] Preferably, a retaining ring and a lower retaining ring are respectively provided at the upper and lower ends of the friction pad.

[0015] Preferably, the end rubber cylinder is divided into an upper end rubber cylinder and a lower end rubber cylinder.

[0016] Beneficial technical effects of the utility model:

[0017] 1. Add a packing seal channel on the basis of the existing inner diameter channel of the packer. This channel remains open during the process of the packer going down the well and acts as a bypass valve;

[0018] 2. While lifting and lowering the pipe string to operate the packer to set and release, the device can automatically control the opening and closing of the secondary channel without adding additional operating steps. When setting or releasing the packer, no additional manual operation is required, and the secondary channel of the packer will automatically perform the corresponding actions as needed.

[0019] 3. It has a special transposition mechanism, so that even if it encounters resistance when going down the well, it will not be set by mistake, ensuring the stability and reliability of the packer. During the operation, the position can be accurately controlled to avoid the wrong setting of the packer caused by misoperation or unexpected situations.

[0020] 4. After reaching the predetermined position, the packing seal mechanism is in the open state, and reverse circulation well washing operations can be carried out to replace the circulation valve.

[0021] 5. When the packer needs to be unsealed, simply lift the pipe column to open the packing seal mechanism, balance the pressure difference between the upper and lower chambers of the packer, and help to smoothly unseal the packer.

[0022] 6. It has flexible switching function, and can open and close the channel multiple times according to specific needs to meet the requirements of different operation stages and improve the applicability and operability of the packer. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1Schematic diagram of the structure of the dual-channel packer in this embodiment.

[0024] Figure numerals: 1. packing sealing spindle, 2. bypass outer cylinder, 3. packing pressure ring, 4. packing sealing ring, 5. stuffing box, 6. sealing ring, 7. upper gauge ring, 8. end rubber cylinder, 9. sealing spacer ring, 10. middle rubber cylinder, 11. lower gauge ring, 12. opening limit ring, 13. fixed shear pin, 14. tooth plate cone, 15. tungsten steel tooth block, 16. tooth plate, 17. tooth plate seat, 18. transposition sleeve, 19. retaining ring, 20. leaf spring, 21. friction pad, 22. friction block, 23. wear-resistant alloy, 24. lower retaining ring, 25. transposition spindle. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0026] like Figure 1 As shown, the utility model proposes a dual-channel packing type packer, comprising a transposition mandrel 25, wherein the upper portion of the transposition mandrel 25 is threadedly connected with a packing sealing mandrel 1 extending upward, a packing sealing mechanism is arranged on the periphery of the packing sealing mandrel 1, and an anchoring friction transposition mechanism is arranged on the periphery of the transposition mandrel 25;

[0027] The packing sealing mechanism includes a bypass outer cylinder 2, a stuffing box 5 is threadedly connected at the bottom of the bypass outer cylinder 2, a packing pressure ring 3 and a packing sealing ring 5 are arranged inside the stuffing box 5, the packing pressure ring 3 and the packing sealing ring 4 form a packing bypass assembly in the stuffing box 5, and are hung on the step of the packing sealing spindle 1, an opening limit ring 12 is clamped at the bottom of the stuffing box 5, and a sealing ring 6, an upper gauge ring 7, an upper end rubber cylinder, a lower end rubber cylinder, a sealing spacer ring 9, a middle rubber cylinder 10, and a lower gauge ring 11 are sequentially sleeved on the periphery of the stuffing box 5, and the opening limit ring 12 is used to limit and fix the above-mentioned components to form a complete packing sealing mechanism, wherein the opening limit ring 12 is clamped at the bottom of the stuffing box 5 so that the components sleeved on the periphery of the stuffing box 5 cannot fall off.

[0028] The anchoring friction transposition mechanism includes a tooth plate cone 14, a fixed shear pin 13 is passed through the outer periphery of the tooth plate cone 14, and the fixed shear pin 13 can be embedded in the annular groove of the packing sealing spindle 1, and a tooth plate 16 is tightly connected to the bottom of the tooth plate cone 14. In addition, when the packer is set, the tooth plate cone 14 and the packing sealing spindle 1 produce relative movement, which can shear off the fixed shear pin 13; a number of tungsten steel tooth blocks 15 are welded on the tooth plate 16, and the short wings on both sides of the tooth plate 16 are slidably matched with the dovetail groove on the tooth plate cone 14, so that the tooth plate 16 can be expanded and firmly anchored to the casing wall during relative movement, and a tooth plate seat 17 is provided below the tooth plate 16, and a transposition sleeve 18 is hung below the tooth plate seat 17, and the transposition sleeve 18 is built with two connected long and short transposition grooves, and the transposition sleeve 18 can only be operated as required to make the transposition The movement and replacement of the positioning pin can ensure that the seal will not be mistakenly seated when encountering obstacles when going down to the well. The outer lower end of the transposition mandrel 25 is provided with a friction pad 21 and a friction block body 22 in sequence. The friction pad 21 is provided with a plurality of wear-resistant alloy blocks 23 to increase the service life of the friction pad 21. A leaf spring 20 is provided on one side of the friction block body 22. A retaining ring 19 and a lower retaining ring 24 are provided at the upper and lower ends of the friction pad 21 respectively. The leaf spring 20 is supported on the friction pad body 22 so that the friction pad 21 is always attached to the inner walls of the retaining ring 19 and the lower retaining ring 24, so that the friction pad 21 and the inner wall of the preset casing in the well form friction during the friction process of the packer going down to the well, providing basic power for realizing transposition and sealing. The special transposition groove on the transposition sleeve 18 cooperates with the transposition pin on the transposition mandrel 25, and the transposition and sealing and unsealing are realized by lifting and releasing the pipe string.

[0029] When the packer is lowered into the well, the transposition pin on the transposition mandrel 25 is inserted into the short groove of the special transposition groove of the transposition sleeve 18, and the friction pad 21 is in close contact with the inner wall of the casing preset in the well, the rubber tube is in a free state, there is a large gap between the packing seal mandrel 1 and the packing seal ring 4, and the oil and gas flow channel is in an open state; when it is lowered to the predetermined well depth, it is necessary to first lift the preset pipe string in the well, so that the transposition pin on the transposition mandrel 25 moves to the lower position of the short groove of the special transposition groove on the transposition sleeve 18, and then rotate the pipe string 1-3 times to the right, while maintaining the torque, lower the pipe string to apply a compressive load. As the pipe string rotates, the transposition pin on the transposition mandrel 25 moves into the long groove of the special transposition groove on the transposition sleeve 18, and when pressurized, the packing seal mandrel 1 moves downward and fits with the packing seal ring 4 to close the secondary oil and gas flow channel. Continue to apply pressure, the tooth plate cone 14 moves downward to expand the tooth plate 16, and the corners of several tungsten steel tooth blocks 15 on the tooth plate 16 are embedded in the casing wall, and then the three rubber tubes are compressed and expanded until they are close to the casing wall to form a seal. At this time, the packer is firmly seated on the inner wall of the casing, and the passage between the oil pipe and the casing annulus space is completely closed. If the packer is to be removed, it is only necessary to apply a tensile load, first pull the packing sealing passage open, balance the upper and lower pressures of the rubber tube, and then continue to lift it up. The rubber tube unloads the pressure and returns to its original free state. At this time, the repositioning pin automatically returns to the short groove, and the tooth plate cone 14 moves upward to forcibly retract the tooth plate 16, and the packer can be removed.

[0030] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0031] In the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0033] The term "comprise" or any other similar term is intended to cover a non-exclusive inclusion, such that a process, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, article, or apparatus / device.

[0034] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A dual-channel packer, comprising a transposition mandrel (25), characterized in that: The upper part of the transposition spindle (25) is threadedly connected with a packing sealing spindle (1) extending upward, the outer periphery of the packing sealing spindle (1) is provided with a packing sealing mechanism, and the outer periphery of the transposition spindle (25) is provided with an anchoring friction transposition mechanism; The packing sealing mechanism comprises a bypass outer cylinder (2), a packing box (5) is threadedly connected to the lower part of the bypass outer cylinder (2), a packing pressure ring (3) and a packing sealing ring (4) are arranged inside the packing box (5), a sealing ring (6), an upper gauge ring (7), an end rubber cylinder (8), a sealing spacer ring (9), a middle rubber cylinder (10), and a lower gauge ring (11) are sequentially sleeved on the outer periphery of the packing box (5), and an opening limiting ring (12) is clamped at the lower part of the packing box (5); The anchoring friction shifting mechanism comprises a tooth plate cone (14), a fixed shear pin (13) is passed through the outer periphery of the tooth plate cone (14), a tooth plate (16) is tightly connected to the lower part of the tooth plate cone (14), a tooth plate seat (17) is provided below the tooth plate, a shifting sleeve (18) is hung below the tooth plate seat (17), and two connected long and short shifting grooves are built in the shifting sleeve (18), and a friction pad (21) and a friction block body (22) are sequentially provided at the outer lower end of the shifting spindle (25), and a leaf spring (20) is provided on one side of the friction block body (22).

2. The dual-channel packer according to claim 1, characterized in that: The packing pressure ring (3) and the packing sealing ring (4) form a packing bypass assembly in the packing box (5) and are hung on the step of the packing sealing spindle (1).

3. The dual-channel packer according to claim 1, characterized in that: A plurality of tungsten steel tooth blocks (15) are welded on the tooth plate (16).

4. The dual-channel packer according to claim 1, characterized in that: The friction pad (21) is provided with a plurality of wear-resistant alloy blocks (23).

5. The dual-channel packer according to claim 1, characterized in that: The fixed shear pin (13) can be embedded in the annular groove of the packing seal spindle (1).

6. The dual-channel packer according to claim 1, characterized in that: The sealing ring (6), the upper gauge ring (7), the end rubber tube (8), the sealing spacer ring (9), the middle rubber tube (10) and the lower gauge ring (11) are all fixed and limited by an opening limiting ring (12).

7. The dual-channel packed packer according to claim 1, characterized in that: A retaining ring (19) and a lower retaining ring (24) are respectively provided at the upper and lower ends of the friction pad (21).

8. The dual-channel packer according to claim 1, characterized in that: The end rubber cylinder (8) is divided into an upper end rubber cylinder and a lower end rubber cylinder.

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