An expandable base-sealing drag fracturing packer

Abstract

The utility model discloses an expansion type bottom seal drag fracturing packer, including the first bush, the inside fixed sleeve of first bush is equipped with the sealing sleeve, the lower joint is fixedly equipped in the sealing sleeve, the first bush is slidably connected first slip, the top surface fixed connection of first bush is glued, and a plurality of equidistance axial array distribution's semicircular ring grooves are arranged in the coaxial of glue cylinder, and the semicircular ring groove is embedded and is equipped with annular air bag, the top surface fixed connection of glue cylinder is second bush, and second bush is slidably connected second slip, and the top surface fixed sleeve of second bush is equipped with sealing ring, and the upper joint is fixedly equipped in the sealing ring, and the center tube is fixedly equipped in the upper joint, and the tail end of center tube extends to first bush, and the outer diameter of glue cylinder is less than the outer diameter of first bush. The utility model discloses reduce the contact distance of glue cylinder in initial state with the inside of well wall, avoid the friction of glue cylinder and well wall inner wall when repeatedly pulling the packer in initial state, reduce the wear of glue cylinder, and guarantee the sealing property.

Description

Technical Field

[0001] This utility model relates to the field of packer technology, and in particular to an expansion-type bottom-seal drag fracturing packer. Background Technology

[0002] Packers are downhole tools used in oil production to create stratified fracturing zones. Specifically, they are downhole tools with elastic sealing elements that seal the annular spaces between tubing of various sizes and the wellbore, as well as between tubing strings, isolating the producing formation to control fluid production and protect the casing. Expandable bottom-seal fracturing packers are a type of packer whose core function is to achieve stratified fracturing by sealing the wellbore, thereby improving reservoir stimulation.

[0003] During multi-stage fracturing, the tubing string needs to be frequently lifted to drag the packer. Traditional structures are prone to wear and tear on the packer due to repeated setting, which can lead to breakage of the packer, affecting its sealing performance. This prevents the packer from expanding under pressure and reduces its sealing effect on the external wellbore. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing an expansion-type bottom-seal drag fracturing packer.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an expansion-type bottom-seal drag fracturing packer, comprising a first sleeve, a sealing sleeve fixedly fitted inside the first sleeve, a lower connector fixedly fitted inside the sealing sleeve, a first slip slidably connected inside the first sleeve, a rubber cylinder fixedly connected to the top surface of the first sleeve, a plurality of equidistantly spaced semi-circular annular grooves coaxially arranged inside the rubber cylinder, annular airbags embedded in the semi-circular annular grooves, a second sleeve fixedly connected to the top surface of the rubber cylinder, a second slip slidably connected inside the second sleeve, a sealing ring fixedly fitted to the top surface of the second sleeve, an upper connector fixedly fitted inside the sealing ring, a central tube fixedly fitted inside the upper connector, the end of the central tube extending into the first sleeve, and the outer diameter of the rubber cylinder being smaller than the outer diameter of the first sleeve.

[0006] As a further description of the above technical solution: A first receiving groove is formed on the outside of the first casing, and the first slip is slidably connected in the first receiving groove. A first groove is formed on the inner wall of the first casing, and a first trapezoidal block is slidably connected in the first groove. The first trapezoidal block is fixedly connected to the first slip, and the inclined surface of the first trapezoidal block is in contact with a conical block. The conical block is slidably connected in the first casing and located above the first trapezoidal block. Multiple support rods distributed in an equidistant ring array are fixedly connected to the end of the central tube, and the support rods are fixedly connected to the first casing. By slidably connecting the first slip outside the first casing and slidably connecting the conical block inside the first casing, the conical block slides downward, and the first slip is driven by the first trapezoidal block to extend out of the first receiving groove, thereby fixing the lower end of the packer to the well wall.

[0007] As a further description of the above technical solution: a first guide rod is horizontally fixed to the rear side of the first trapezoidal block, the first guide rod slides through the first groove and is fixedly connected to the first slip, a first spring is sleeved on the outer edge of the first guide rod, and the first spring is fixedly connected between the inner wall of the first trapezoidal block and the first groove; by setting the first spring, the tightness of the first slip and the well wall is improved, and the firmness of the lower end of the packer and the well wall is improved.

[0008] As a further description of the above technical solution: a first guide groove is formed on the inner wall of the first sleeve, a first guide plate is slidably connected in the first guide groove, the first guide plate is fixedly connected to the conical block, and the first guide groove and the first groove are distributed intersectingly; by using the first guide plate and the first guide groove to slidably connect the conical block in the first sleeve, the axial movement of the conical block in the first sleeve is limited and guided.

[0009] As a further description of the above technical solution: A second receiving groove is opened on the outside of the second casing, and the second slip is slidably connected in the second receiving groove. A second groove is opened on the inner wall of the second casing, and a second trapezoidal block is slidably connected in the second groove. The second trapezoidal block is fixedly connected to the second slip, and the inclined surface of the second trapezoidal block fits against a conical ring. The conical ring is slidably connected inside the second casing and located below the second trapezoidal block. By slidably connecting the second slip outside the second casing and slidably connecting the conical ring inside the second casing, the conical ring slides upward, and the second slip is driven by the second trapezoidal block to extend out of the second receiving groove, thereby fixing the upper end of the packer to the well wall.

[0010] As a further description of the above technical solution: a second guide rod is horizontally fixed to the rear side of the second trapezoidal block, the second guide rod slides through the second groove and is fixedly connected to the second slip, a second spring is sleeved on the outer edge of the second guide rod, and the second spring is fixedly connected between the inner wall of the second trapezoidal block and the second groove; by setting the second spring, the tightness of the second slip against the well wall is improved, and the firmness of the upper end of the packer fixed to the well wall is improved.

[0011] As a further description of the above technical solution: a second guide groove is formed on the inner wall of the second sleeve, a second guide plate is slidably connected in the second guide groove, the second guide plate is fixedly connected to the conical ring, and the second guide groove and the second groove are distributed intersectingly; by using the second guide plate and the second guide groove to slidably connect the conical ring in the second sleeve, the axial movement of the conical ring in the second sleeve is limited and guided.

[0012] This utility model has the following beneficial effects:

[0013] Compared with existing technologies, this expansion-type bottom-seal drag fracturing packer reduces the outer diameter of the packer by setting multiple semi-circular annular grooves inside the packer and embedding annular airbags in the semi-circular annular grooves. This reduces the contact distance between the packer and the well wall in the initial state, avoids friction between the packer and the well wall when the packer is repeatedly pulled in the initial state, reduces the wear of the packer, and ensures sealing. Attached Figure Description

[0014] Figure 1 This is a three-dimensional view of the overall structure of an expansion-type bottom-seal drag fracturing packer proposed in this utility model;

[0015] Figure 2 This is a main sectional view of the overall structure of an expansion-type bottom-seal drag fracturing packer proposed in this utility model;

[0016] Figure 3 This utility model proposes an expansion-type bottom-seal drag fracturing packer. Figure 2 Enlarged view of the structure at point A in the middle;

[0017] Figure 4 This utility model proposes an expansion-type bottom-seal drag fracturing packer. Figure 2 Enlarged view of the structure at point B;

[0018] Figure 5 This utility model proposes an expansion-type bottom-seal drag fracturing packer. Figure 2 Enlarged view of the structure at point C.

[0019] Legend:

[0020] 1. Lower connector; 2. Sealing sleeve; 3. First slip; 4. First sleeve; 5. Rubber sleeve; 6. Second slip; 7. Second sleeve; 8. Upper connector; 9. Second storage groove; 10. First storage groove; 11. Sealing ring; 12. Central tube; 13. Conical ring; 14. Semi-circular annular groove; 15. Annular airbag; 16. Conical block; 17. First trapezoidal block; 18. First spring; 19. First groove; 20. First guide rod; 21. Support rod; 22. Second trapezoidal block; 23. Second spring; 24. Second groove; 25. Second guide rod. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Reference Figures 1 to 5 The present invention provides an expansion-type bottom-seal drag fracturing packer, comprising a first sleeve 4, a sealing sleeve 2 fixedly fitted inside the first sleeve 4, a lower connector 1 fixedly fitted inside the sealing sleeve 2, a first slip 3 slidably connected inside the first sleeve 4, a rubber cylinder 5 fixedly connected to the top surface of the first sleeve 4, a plurality of equidistant axially arrayed semi-circular annular grooves 14 coaxially formed inside the rubber cylinder 5, annular airbags 15 embedded in the semi-circular annular grooves 14, a second sleeve 7 fixedly connected to the top surface of the rubber cylinder 5, a second slip 6 slidably connected inside the second sleeve 7, a sealing ring 11 fixedly fitted to the top surface of the second sleeve 7, an upper connector 8 fixedly fitted inside the sealing ring 11, a central tube 12 fixedly fitted inside the upper connector 8, the end of the central tube 12 extending into the first sleeve 4, and the outer diameter of the rubber cylinder 5 being smaller than the outer diameter of the first sleeve 4;

[0023] A first receiving groove 10 is formed on the outside of the first sleeve 4. A first latch 3 is slidably connected inside the first receiving groove 10. A first groove 19 is formed on the inner wall of the first sleeve 4. A first trapezoidal block 17 is slidably connected inside the first groove 19. The first trapezoidal block 17 is fixedly connected to the first latch 3. The inclined surface of the first trapezoidal block 17 fits against a conical block 16. The conical block 16 is slidably connected inside the first sleeve 4 and is located above the first trapezoidal block 17. Multiple support rods 21 distributed in an equidistant ring array are fixedly connected to the end of the central tube 12. The first guide rod 20 is fixedly connected to the first sleeve 4 and horizontally fixed to the rear side of the first trapezoidal block 17. The first guide rod 20 slides through the first groove 19 and is fixedly connected to the first latch 3. The outer edge of the first guide rod 20 is fitted with a first spring 18, which is fixedly connected between the inner walls of the first trapezoidal block 17 and the first groove 19. The inner wall of the first sleeve 4 is provided with a first guide groove, and a first guide plate is slidably connected in the first guide groove. The first guide plate is fixedly connected to the conical block 16. The first guide groove and the first groove 19 are distributed intersectingly.

[0024] The second sleeve 7 has a second receiving groove 9 on its outside. The second latch 6 is slidably connected in the second receiving groove 9. The inner wall of the second sleeve 7 has a second groove 24. The second trapezoidal block 22 is slidably connected in the second groove 24. The second trapezoidal block 22 is fixedly connected to the second latch 6. The inclined surface of the second trapezoidal block 22 fits the conical ring 13. The conical ring 13 is slidably connected in the second sleeve 7 and located below the second trapezoidal block 22. The conical ring 13 is slidably sleeved on the outer edge of the central tube 12. The rear side of the second trapezoidal block 22 is horizontally fixed with a second guide rod 25. The second guide rod 25 slides through the second groove 24 and is fixedly connected to the second latch 6. The outer edge of the second guide rod 25 is sleeved with a second spring 23. The second spring 23 is fixedly connected between the inner walls of the second trapezoidal block 22 and the second groove 24. The inner wall of the second sleeve 7 has a second guide groove. The second guide plate is slidably connected in the second guide groove. The second guide plate is fixedly connected to the conical ring 13. The second guide groove and the second groove 24 are distributed intersectingly.

[0025] By setting multiple semi-circular annular grooves 14 inside the rubber sleeve 5 and embedding annular airbags 15 in the semi-circular annular grooves 14, the outer diameter of the rubber sleeve 5 is reduced, which reduces the contact distance between the rubber sleeve 5 and the inside of the well wall in the initial state. This avoids friction between the rubber sleeve 5 and the inner wall of the well wall when the packer is repeatedly pulled up in the initial state, reducing wear on the rubber sleeve 5 and ensuring sealing.

[0026] Working principle: During use, the entire device is placed into the wellbore. High-pressure fluid is then injected into the device through the upper connector 8. The high-pressure fluid enters the first sleeve 4 through the central pipe 12. After entering the lower sleeve, the fluid pressure drives the conical block 16 to descend. The conical block 16 drives the first trapezoidal block 17 to move into the first groove 19. Simultaneously, the movement of the first trapezoidal block 17 drives the first spring 18 to compress synchronously. The first trapezoidal block 17 pushes the first slip 3 out of the first receiving groove 10 through the first guide rod 20 and abuts against the well wall. Then, the fluid flows upward, and the upward pressure drives the conical ring 13 to move upward. 3. The second trapezoidal block 22 moves into the second groove 24. While the second trapezoidal block 22 moves, it drives the second spring 23 to compress synchronously. The second trapezoidal block 22 pushes the second slip 6 out of the second receiving groove 9 through the second guide rod 25 and abuts against the well wall, supporting and fixing the entire equipment in the well. At the same time, the rubber sleeve 5 expands under the action of fluid pressure, so that the outer wall of the rubber sleeve 5 abuts against the well wall. At the same time, the fluid pressure will drive the annular airbag 15 to squeeze, so that the annular airbag 15 drives the semi-circular annular groove 14 in the rubber sleeve 5 to expand outward, improving the fit between the rubber sleeve 5 and the well wall, thereby improving the sealing effect of the rubber sleeve 5 at the fracturing point in the well.

[0027] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An expansion-type bottom-seal drag fracturing packer, comprising a first sleeve (4), characterized in that: A sealing sleeve (2) is fixedly fitted inside the first sleeve (4), and a lower connector (1) is fixedly fitted inside the sealing sleeve (2). A first slip (3) is slidably connected inside the first sleeve (4). A rubber tube (5) is fixedly connected to the top surface of the first sleeve (4). Multiple equidistant semi-circular annular grooves (14) are coaxially arranged in the rubber tube (5). An annular airbag (15) is embedded in the semi-circular annular grooves (14). A second sleeve (7) is fixedly connected to the top surface of the rubber tube (5). A second slip (6) is slidably connected inside the second sleeve (7). A sealing ring (11) is fixedly fitted to the top surface of the second sleeve (7). An upper connector (8) is fixedly fitted inside the sealing ring (11). A central tube (12) is fixedly fitted inside the upper connector (8). The end of the central tube (12) extends into the first sleeve (4). The outer diameter of the rubber tube (5) is smaller than the outer diameter of the first sleeve (4).

2. The expansion-type bottom-seal drag fracturing packer according to claim 1, characterized in that: A first storage groove (10) is opened on the outside of the first sleeve (4), and the first clip (3) is slidably connected in the first storage groove (10). A first groove (19) is opened on the inner wall of the first sleeve (4). A first trapezoidal block (17) is slidably connected in the first groove (19). The first trapezoidal block (17) is fixedly connected to the first clip (3). The inclined surface of the first trapezoidal block (17) is attached to the conical block (16). The conical block (16) is slidably connected in the first sleeve (4) and located above the first trapezoidal block (17). A plurality of support rods (21) distributed in an equidistant ring array are fixedly connected to the end of the central tube (12). The support rods (21) are fixedly connected to the first sleeve (4).

3. The expansion-type bottom-seal drag fracturing packer according to claim 2, characterized in that: A first guide rod (20) is horizontally fixed to the rear side of the first trapezoidal block (17). The first guide rod (20) slides through the first groove (19) and is fixedly connected to the first latch (3). A first spring (18) is sleeved on the outer edge of the first guide rod (20). The first spring (18) is fixedly connected between the inner wall of the first trapezoidal block (17) and the first groove (19).

4. The expansion-type bottom-seal drag fracturing packer according to claim 2, characterized in that: The inner wall of the first sleeve (4) is provided with a first guide groove, and a first guide plate is slidably connected in the first guide groove. The first guide plate is fixedly connected to the conical block (16), and the first guide groove and the first groove (19) are distributed intersectingly.

5. The expansion-type bottom-seal drag fracturing packer according to claim 1, characterized in that: A second storage groove (9) is opened on the outside of the second sleeve (7), and the second clip (6) is slidably connected in the second storage groove (9). A second groove (24) is opened on the inner wall of the second sleeve (7), and a second trapezoidal block (22) is slidably connected in the second groove (24). The second trapezoidal block (22) is fixedly connected to the second clip (6). The inclined surface of the second trapezoidal block (22) fits the conical ring (13). The conical ring (13) is slidably connected in the second sleeve (7) and located below the second trapezoidal block (22).

6. An expansion-type bottom-seal drag fracturing packer according to claim 5, characterized in that: The second guide rod (25) is horizontally fixed to the rear side of the second trapezoidal block (22). The second guide rod (25) slides through the second groove (24) and is fixedly connected to the second latch (6). The outer edge of the second guide rod (25) is fitted with a second spring (23). The second spring (23) is fixedly connected between the inner wall of the second trapezoidal block (22) and the second groove (24).

7. An expansion-type bottom-seal drag fracturing packer according to claim 5, characterized in that: The inner wall of the second sleeve (7) is provided with a second guide groove, and a second guide plate is slidably connected in the second guide groove. The second guide plate is fixedly connected to the conical ring (13), and the second guide groove and the second groove (24) are distributed intersectingly.

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