A drilling plugging packer

Abstract

The invention discloses a drilling plugging packer, which belongs to the technical field of drilling plugging, and comprises a central tube; a guide shoe fixedly mounted on the lower end of the central tube; an upper cone ring, a seat ring, a lower cone ring, a rubber tube, a rubber tube gasket and a piston which are sequentially mounted on the outer side of the central tube and located between the upper end of the central tube and the guide shoe from top to bottom; a strip groove arranged on the outer wall of the guide shoe; the upper end of the strip groove penetrates the upper end surface of the guide shoe to form a first upper notch, the lower end of the strip groove penetrates the lower end surface of the guide shoe to form a first lower notch, the strip groove extends from the first upper notch to the first lower notch, and the outer diameters of the upper cone ring, the seat ring, the lower cone ring, the rubber tube, the rubber tube gasket and the piston are all smaller than the outer diameter of the guide shoe. The invention can greatly reduce the resistance borne by the drilling plugging packer when it is lowered into the well, and improve the lowering efficiency of the drilling plugging packer.

Description

Technical Field

[0001] The invention belongs to the technical field of drilling isolation, and in particular relates to a drilling plugging and sealing device. Background Art

[0002] The Chinese invention patent with application number 202310017227.6 discloses a drilling constant pressure trap packer and a plugging method. Its main structure includes a seat hanging mechanism, a rubber cylinder, a piston, a sealing ring and a guide shoe. The packer has a good sealing effect, a simple structure and is easy to assemble. During actual use, it was found that the above existing technologies still have the following two problems: First, when the packer is lowered into the well, there is a lot of liquid in the well, and because the distance between the guide shoe and the guide ring and the inner wall of the wellbore is small, it is difficult for the liquid at the bottom of the packer to be discharged upward, resulting in a large external pressure required when the packer is lowered, and the descent speed is relatively slow; second, since the rubber cylinder has not been subjected to axial pressure during the descent and lacks circumferential limit, coupled with the existence of problem one, due to the small gap between the packer and the side wall of the wellbore, there is a large impact force when the liquid at the bottom of the packer is discharged upward, which ultimately causes the rubber cylinder to rotate around the axis during the descent of the packer, which easily causes the rubber cylinder to rub against the well wall, resulting in damage to the outer wall sealing structure; on the other hand, in the later stage of mining, it is necessary to use a drill bit to drill out all the packers. Also because the rubber cylinder lacks circumferential limit, during the process of drilling out the packer, the rubber cylinder will slip and rotate with the drill bit, resulting in the inability to completely eliminate the rubber cylinder. Summary of the invention

[0003] In view of the deficiencies of the prior art, the present invention provides a drilling plugging packer which can reduce the resistance endured when going down into the well.

[0004] The technical solution of the present invention is as follows:

[0005] A drilling plugging packer, comprising:

[0006] Central tube;

[0007] A guide shoe fixedly mounted on the lower end of the center tube;

[0008] The upper cone ring, the seat ring, the lower cone ring, the rubber tube, the rubber tube gasket and the piston are sequentially mounted on the outside of the center tube and located between the upper end of the center tube and the guide shoe from top to bottom;

[0009] Also includes:

[0010] A strip groove provided on the outer wall of the guide shoe;

[0011] Among them, the upper end of the strip groove penetrates the upper end surface of the guide shoe to form a first upper notch, the lower end of the strip groove penetrates the lower end surface of the guide shoe to form a first lower notch, the strip groove extends from the first upper notch to the first lower notch, the outer diameter of the upper cone ring, the outer diameter of the seat hanging ring, the outer diameter of the lower cone ring, the outer diameter of the rubber cylinder, the outer diameter of the rubber cylinder gasket and the outer diameter of the piston are all smaller than the outer diameter of the guide shoe.

[0012] There are multiple strip grooves, which are evenly distributed along the circumference of the guide shoe.

[0013] The strip-shaped grooves are inclined relative to the axis of the central tube.

[0014] The first upper notch and the first lower notch of the strip groove are staggered with each other along the circumferential direction of the guide shoe.

[0015] Also includes:

[0016] An upper joint disposed at the upper end of the central tube;

[0017] The flange is arranged on the outer wall of the upper joint, and the outer diameter of the flange is the same as the outer diameter of the guide shoe.

[0018] Also includes:

[0019] a drainage groove provided on the outer wall of the flange;

[0020] The upper end of the drainage groove penetrates the upper end surface of the flange to form a second upper notch, the lower end of the drainage groove penetrates the lower end surface of the flange to form a second lower notch, and the drainage groove extends from the second upper notch to the second lower notch.

[0021] There are multiple drainage grooves, which are evenly distributed along the circumference of the flange.

[0022] The drainage groove is inclined relative to the axis of the central pipe.

[0023] The second upper notch and the second lower notch of the drainage groove are staggered with each other along the circumferential direction of the flange.

[0024] Also includes:

[0025] An upper joint disposed at the upper end of the central tube;

[0026] A flange is arranged on the outer wall of the upper joint, and the outer diameter of the flange is the same as the outer diameter of the guide shoe;

[0027] a drainage groove provided on the outer wall of the flange;

[0028] Among them, the upper end of the drainage groove passes through the upper end surface of the flange to form a second upper notch, the lower end of the drainage groove passes through the lower end surface of the flange to form a second lower notch, and the drainage groove extends from the second upper notch to the second lower notch; the drainage groove is inclined relative to the axis of the central tube, and the drainage groove and the strip groove are inclined in opposite directions relative to the axis of the central tube.

[0029] Also includes:

[0030] A first shear pin connected between the lower cone ring and the center pipe;

[0031] A second shear pin connected between the rubber cartridge gasket and the center tube;

[0032] A first protrusion disposed on the upper end surface of the rubber cylinder;

[0033] A second protrusion disposed on the lower end surface of the rubber cylinder;

[0034] A first recessed portion disposed on the lower end surface of the lower cone ring and matching the first protruding portion;

[0035] A second recessed portion disposed on the upper end surface of the rubber sleeve gasket and matching the second protruding portion;

[0036] Wherein, after the drilling plugging packer is assembled, the first protrusion is embedded in the first recess, and the second protrusion is embedded in the second recess;

[0037] Or, also include:

[0038] A first shear pin connected between the lower cone ring and the center pipe;

[0039] A first protrusion disposed on the upper end surface of the rubber cylinder;

[0040] A first recessed portion disposed on the lower end surface of the lower cone ring and matching the first protruding portion;

[0041] Wherein, after the drilling plugging packer is assembled, the first protrusion is embedded in the first recess;

[0042] Or, also include:

[0043] A second shear pin connected between the rubber cartridge gasket and the center tube;

[0044] A second protrusion disposed on the lower end surface of the rubber cylinder;

[0045] A second recessed portion disposed on the upper end surface of the rubber sleeve gasket and matching the second protruding portion;

[0046] After the drilling plugging packer is assembled, the second protrusion is embedded in the second recess.

[0047] The beneficial effects of the present invention are as follows:

[0048] The present invention can greatly reduce the resistance borne by the drilling plugging packer when it is lowered into the well, and improve the lowering efficiency of the drilling plugging packer; and the rubber sleeve realizes circumferential limiting through the cooperation of the protrusion and the recess, thereby ensuring the stability of the position of the rubber sleeve when the drilling plugging packer is lowered into the well or is damaged in the later stage of drilling, avoiding damage during the lowering process and preventing the rubber sleeve from rotating with the drill bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 A cross-sectional view of the present invention cut along its axial direction is shown;

[0050] Figure 2 A schematic diagram of the structure of the upper joint is shown;

[0051] Figure 3 A schematic diagram of the lower cone ring structure is shown;

[0052] Figure 4 A cross-sectional view of the rubber cartridge cut along its axial direction is shown;

[0053] Figure 5 The structural schematic diagram of the rubber cartridge gasket is shown;

[0054] Figure 6 A schematic structural diagram of a guide shoe is shown.

[0055] Markings in the figure: 1-center tube, 2-upper joint, 21-drainage groove, 3-guide shoe, 31-strip groove, 41-upper cone ring, 42-seat hanging ring, 43-lower cone ring, 431-first recess, 5-rubber cylinder, 51-first protrusion, 52-second protrusion, 6-rubber cylinder gasket, 61-second recess, 7-piston. DETAILED DESCRIPTION

[0056] The present invention is further described below by means of specific examples, but is not limited thereto.

[0057] See also Figure 1 A drilling plugging packer in many embodiments of the present invention includes a central pipe 1, a guide shoe 3, a strip groove 31, an upper cone ring 41, a seat hanging ring 42, a lower cone ring 43, a rubber tube 5, a rubber tube gasket 6 and a piston 7.

[0058] Figure 1 In the embodiment presented, the central tube 1 is of cylindrical structure.

[0059] The guide shoe 3 is fixedly sleeved outside the lower end of the central tube 1. The guide shoe 3 and the central tube 1 are preferably coaxial.

[0060] The upper cone ring 41, the seat ring 42, the lower cone ring 43, the rubber cylinder gasket 6 are in a circular ring structure, and the rubber cylinder 5 is in a cylindrical structure. The upper cone ring 41, the seat ring 42, the lower cone ring 43, the rubber cylinder 5, the rubber cylinder gasket 6 and the piston 7 are sequentially mounted on the outside of the central pipe 1 from top to bottom and are located between the upper end of the central pipe 1 and the guide shoe 3. The outer diameters of the upper cone ring 41, the seat ring 42, the lower cone ring 43, the rubber cylinder 5, the rubber cylinder gasket 6 and the piston 7 are all smaller than the outer diameter of the guide shoe 3, so that when the drilling plugging packer is lowered into the well, there is a gap between the outer wall of the upper cone ring 41, the outer wall of the seat ring 42, the outer wall of the lower cone ring 43, the outer wall of the rubber cylinder 5, the outer wall of the rubber cylinder gasket 6 and the well wall, and the gap forms a channel for the liquid in the well to flow upward.

[0061] The lower end surface of the upper cone ring 41 is a first cone surface, the upper end surface of the lower cone ring 43 is a second cone surface, the upper end surface of the seat ring 42 is a cone surface matching the first cone surface, and the lower end surface of the seat ring 42 is a cone surface matching the second cone surface.

[0062] See also Figure 6 The strip groove 31 is arranged on the outer wall of the guide shoe 3 to facilitate processing and reduce the probability of the strip groove 31 being blocked. The upper end of the strip groove 31 passes through the upper end surface of the guide shoe 3 to form a first upper notch, and the lower end of the strip groove 31 passes through the lower end surface of the guide shoe 3 to form a first lower notch. The strip groove 31 extends from the first upper notch to the first lower notch. Figure 6 In the embodiment presented, the strip grooves 31 are straight strip grooves.

[0063] During the process of lowering the drilling plugging packer into the well, the liquid at the bottom of the well quickly flows upward through the strip groove 31, and in turn flows to the top of the drilling plugging packer through the outer wall of the rubber cylinder gasket 6, the outer wall of the rubber cylinder 5, the outer wall of the lower cone ring 43, the outer wall of the seat hanging ring 42, and the gap between the outer wall of the upper cone ring 41 and the well wall, which can greatly reduce the resistance that the drilling plugging packer is subjected to when lowering into the well, and improve the lowering efficiency of the drilling plugging packer.

[0064] See also Figure 6 The number of the strip grooves 31 is multiple to increase the water flow. It is better that the strip grooves 31 are evenly distributed along the circumference of the guide shoe 3.

[0065] See also Figure 6 The strip groove 31 is inclined relative to the axis of the central tube 1 so that the downwardly inclined side wall of the strip groove 31 can be used as a blade structure to scrape off debris on the well wall, such as protruding rocks, to make the well wall smoother, thereby preventing the rubber tube 5 from being scratched.

[0066] See also Figure 6The first upper notch of the strip groove 31 and the first lower notch of the strip groove 31 are staggered along the circumference of the guide shoe 3, thereby ensuring that the projection of the outer wall of the guide shoe 3 along the axis of the guide shoe 3 is a complete circle, so as to completely cover the circumferential inner wall of the well, and can thoroughly scrape off the debris on the well wall to avoid omissions.

[0067] See also Figure 1 , Figure 2 In some embodiments, a drilling plugging packer further includes an upper joint 2 and a flange.

[0068] The upper joint 2 is disposed at the upper end of the central tube 1. The upper joint 2 and the central tube 1 are preferably coaxial.

[0069] See also Figure 2 The flange is arranged on the outer wall of the upper joint 2. Specifically, the flange can be arranged on the outer wall of the lower end of the upper joint 2. The outer diameter of the flange is the same as the outer diameter of the guide shoe 3. The flange and the outer wall of the guide shoe 3 jointly guide the drilling plugging packer to prevent the upper end of the drilling plugging packer from deflecting.

[0070] See also Figure 1 , Figure 2 In some embodiments, a drilling plugging packer further includes a drainage groove 21.

[0071] The drainage groove 21 is arranged on the outer wall of the flange. The upper end of the drainage groove 21 penetrates the upper end face of the flange to form a second upper notch, and the lower end of the drainage groove 21 penetrates the lower end face of the flange to form a second lower notch. The drainage groove 21 extends from the second upper notch to the second lower notch, and the drainage groove 21 is connected to the strip groove 31 through the gap formed between the outer wall of the upper cone ring 41, the outer wall of the seat hanging ring 42, the outer wall of the lower cone ring 43, the outer wall of the rubber tube 5, the outer wall of the rubber tube gasket 6 and the well wall, thereby reducing the liquid resistance encountered by the drilling plugging packer when it is lowered, and avoiding affecting the lowering speed of the drilling plugging packer.

[0072] See also Figure 2 The number of the drainage grooves 21 is multiple to increase the amount of water flowing. It is better that the drainage grooves 21 are evenly distributed along the circumference of the flange.

[0073] See also Figure 2 The drainage groove 21 is inclined relative to the axis of the central pipe 1 so that the downwardly inclined side wall of the drainage groove 21 can be used as a blade structure to scrape off debris on the well wall, such as protruding rocks, to make the well wall smoother, thereby preventing the rubber cylinder 5 from being scratched.

[0074] See also Figure 2 The second upper notch of the drainage groove 21 and the second lower notch of the drainage groove 21 are staggered along the circumference of the flange, thereby ensuring that the projection of the outer wall of the upper joint 2 along the axis of the upper joint 2 is a complete circle, so as to completely cover the circumferential inner wall of the well, and can thoroughly scrape off the debris on the well wall to avoid omissions.

[0075] See also Figure 2 , Figure 6 The drainage groove 21 is inclined relative to the axis of the central pipe 1, and the drainage groove 21 and the strip groove 31 are inclined in opposite directions relative to the axis of the central pipe 1, so that the downwardly inclined side walls of the drainage groove 21 and the strip groove 31 are in opposite directions along the circumferential direction, thereby further improving the effect of cleaning the well wall.

[0076] See also Figure 1 , Figure 3-Figure 5 In some embodiments, a drilling plugging packer further includes a first shear pin, a second shear pin, a first protrusion 51 , a second protrusion 52 , a first recess 431 , and a second recess 61 .

[0077] The first shear pin is connected between the lower cone ring 43 and the central pipe 1 , and is used to limit the lower cone ring 43 from rotating around the central pipe 1 .

[0078] The second shear pin is connected between the rubber cartridge gasket 6 and the central tube 1 , and is used to limit the rotation of the rubber cartridge gasket 6 with the central tube 1 as the axis.

[0079] The first protrusion 51 is disposed on the upper end surface of the rubber tube 5 . The second protrusion 52 is disposed on the lower end surface of the rubber tube 5 .

[0080] The first recessed portion 431 is disposed on the lower end surface of the lower cone ring 43 and matches the first protruding portion 51. The second recessed portion 61 is disposed on the upper end surface of the rubber sleeve gasket 6 and matches the second protruding portion 52.

[0081] After the drilling plugging packer is assembled, the first protrusion 51 is embedded in the first recess 431 , the second protrusion 52 is embedded in the second recess 61 , the lower cone ring 43 is pressed against the upper end face of the rubber tube 5 , and the rubber tube gasket 6 is pressed against the lower end face of the rubber tube 5 .

[0082] The rubber cylinder 5 realizes circumferential limitation by the cooperation between the first protrusion 51 and the first recess 431, the cooperation between the second recess 61 and the second protrusion 52, and the restriction of the lower cone ring 43 and the rubber cylinder gasket 6 to rotate with the center pipe 1 as the axis. That is, the rubber cylinder 5 cannot rotate relative to the center pipe 1, thereby ensuring the stability of the position of the rubber cylinder 5 when the drilling plugging seal is lowered into the well or is destroyed in the later stage, avoiding damage during the lowering process and preventing it from rotating with the drill bit.

[0083] The first protrusion 51 and the second protrusion 52 are arranged in a plurality along the circumference. The first recess 431 and the second recess 61 are arranged in one-to-one correspondence with the first protrusion 51 and the second protrusion 52 to further improve the stability of the circumferential limit of the rubber cylinder 5.

[0084] The first protruding portion 51 , the second protruding portion 52 and the rubber sleeve 5 are integrally cast to ensure the structural strength of the first protruding portion 51 and the second protruding portion 52 .

[0085] Alternatively, a drilling plugging packer in some embodiments further includes a first shear pin, a first protrusion 51, and a first recess 431. The first shear pin is connected between the lower cone ring 43 and the central pipe 1, and the first shear pin is used to limit the lower cone ring 43 from rotating around the central pipe 1. The first protrusion 51 is arranged on the upper end face of the rubber tube 5. The first recess 431 is arranged on the lower end face of the lower cone ring 43 and matches with the first protrusion 51. After the drilling plugging packer is assembled, the first protrusion 51 is embedded in the first recess 431. Preferably, the lower cone ring 43 is pressed against the upper end face of the rubber tube 5.

[0086] The rubber cylinder 5 achieves circumferential limitation by cooperating with the first protrusion 51 and the first recess 431 and limiting the rotation of the lower cone ring 43 around the center pipe 1, that is, the rubber cylinder 5 cannot rotate relative to the center pipe 1, thereby ensuring the stability of the position of the rubber cylinder 5 when the drilling plugging seal is lowered into the well or is destroyed in the later stage of drilling, avoiding damage during the lowering process and preventing the rubber cylinder 5 from rotating with the drill bit.

[0087] Alternatively, a drilling plugging packer in some embodiments further includes a second shear pin, a second protrusion 52, and a second recess 61. The second shear pin is connected between the rubber sleeve gasket 6 and the central tube 1, and the second shear pin is used to limit the rotation of the rubber sleeve gasket 6 with the central tube 1 as the axis. The second protrusion 52 is arranged on the lower end face of the rubber sleeve 5. The second recess 61 is arranged on the upper end face of the rubber sleeve gasket 6 and matches with the second protrusion 52. After the drilling plugging packer is assembled, the second protrusion 52 is embedded in the second recess 61. Preferably, the rubber sleeve gasket 6 is pressed against the lower end face of the rubber sleeve 5. The rubber sleeve 5 realizes circumferential limitation by the cooperation of the second recess 61 and the second protrusion 52 and limiting the rotation of the rubber sleeve gasket 6 with the central tube 1 as the axis, that is, the rubber sleeve 5 cannot rotate relative to the central tube 1, thereby ensuring the stability of the position of the rubber sleeve 5 when the drilling plugging packer is lowered into the well or drilled out later, avoiding damage during the lowering process and preventing it from rotating with the drill bit.

Claims

1. A drilling plugging packer, comprising: Central tube (1); A guide shoe (3) fixedly sleeved on the lower end of the central tube (1); An upper cone ring (41), a seat ring (42), a lower cone ring (43), a rubber cylinder (5), a rubber cylinder gasket (6) and a piston (7) are sequentially mounted on the outside of the central tube (1) and located between the upper end of the central tube (1) and the guide shoe (3) from top to bottom; It is characterized by further comprising: A strip groove (31) provided on the outer wall of the guide shoe (3); The upper end of the strip groove (31) penetrates the upper end surface of the guide shoe (3) to form a first upper notch, the lower end of the strip groove (31) penetrates the lower end surface of the guide shoe (3) to form a first lower notch, the strip groove (31) extends from the first upper notch to the first lower notch, and the outer diameters of the upper cone ring (41), the seat ring (42), the lower cone ring (43), the rubber tube (5), the rubber tube gasket (6) and the piston (7) are all smaller than the outer diameter of the guide shoe (3); Also includes: An upper joint (2) disposed at the upper end of the central tube (1); A flange is arranged on the outer wall of the upper joint (2), and the outer diameter of the flange is the same as the outer diameter of the guide shoe (3); A drainage groove (21) is arranged on the outer wall of the flange, the upper end of the drainage groove (21) penetrates the upper end surface of the flange to form a second upper notch, the lower end of the drainage groove (21) penetrates the lower end surface of the flange to form a second lower notch, and the drainage groove (21) extends from the second upper notch to the second lower notch.

2. A drilling plugging packer according to claim 1, characterized in that: The strip-shaped grooves (31) are multiple in number and are evenly distributed along the circumference of the guide shoe (3).

3. A drilling plugging packer according to claim 1, characterized in that: The strip-shaped groove (31) is inclined relative to the axis of the central tube (1).

4. A drilling plugging packer according to claim 1, characterized in that: The first upper notch of the strip groove (31) and the first lower notch thereof are staggered with respect to each other along the circumferential direction of the guide shoe (3).

5. A drilling plugging packer according to claim 1, characterized in that: The drainage grooves (21) are multiple in number and are evenly distributed along the circumference of the flange.

6. A drilling plugging packer according to claim 1, characterized in that: The drainage groove (21) is inclined relative to the axis of the central pipe (1).

7. A drilling plugging packer according to claim 1, characterized in that: The second upper notch of the drainage groove (21) and the second lower notch thereof are staggered with respect to each other along the circumferential direction of the flange.

8. A drilling plugging packer according to claim 3, characterized in that: The drainage groove (21) is inclined relative to the axis of the central tube (1), and the drainage groove (21) and the strip groove (31) are inclined in opposite directions relative to the axis of the central tube (1).

9. A drilling plugging packer according to any one of claims 1 to 8, characterized in that: Also includes: A first shear pin connected between the lower cone ring (43) and the center tube (1); A second shear pin connected between the rubber cartridge gasket (6) and the center tube (1); A first protruding portion (51) disposed on the upper end surface of the rubber cylinder (5); A second protruding portion (52) disposed on the lower end surface of the rubber cylinder (5); A first recessed portion (431) disposed on the lower end surface of the lower cone ring (43) and matching the first protruding portion (51); A second recess (61) disposed on the upper end surface of the rubber cylinder gasket (6) and matching the second protrusion (52); Wherein, after the drilling plugging packer is assembled, the first protruding portion (51) is embedded in the first recessed portion (431), and the second protruding portion (52) is embedded in the second recessed portion (61); Or, also include: A first shear pin connected between the lower cone ring (43) and the center tube (1); A first protruding portion (51) disposed on the upper end surface of the rubber cylinder (5); A first recessed portion (431) disposed on the lower end surface of the lower cone ring (43) and matching the first protruding portion (51); Wherein, after the drilling plugging packer is assembled, the first protruding portion (51) is embedded in the first recessed portion (431); Or, also include: A second shear pin connected between the rubber cartridge gasket (6) and the center tube (1); A second protruding portion (52) disposed on the lower end surface of the rubber cylinder (5); A second recess (61) disposed on the upper end surface of the rubber cylinder gasket (6) and matching the second protrusion (52); After the drilling plugging packer is assembled, the second protruding portion (52) is embedded in the second recessed portion (61).

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