Composite material drillable bridge plug

Abstract

The utility model belongs to the technical field of drillable bridge plugs, and discloses a composite material drillable bridge plug which comprises a central rubber sleeve, composite sheets are fixedly connected to the two ends of the central rubber sleeve, a composite cone is fixedly connected to the side, away from the central rubber sleeve, of each composite sheet, a clamping groove is formed in the outer side of the middle of each composite cone, and the clamping grooves are communicated with the central rubber sleeve. The outer side of one end of the composite cone body is sleeved with a slip, a metal centralizing ring is embedded in the outer side of the slip, the bottom end of the slip is fixedly connected with a plurality of sets of triangular clamping blocks, the cross section area of each triangular clamping block is the same as that of the clamping groove, and one side of the composite cone body is further provided with a connecting block. The problems that in the prior art, when a slip is opened to extrude a shaft wall, the slip cannot be locked, and in the long-time extrusion process, the slip possibly shrinks accidentally in the working process, so that a bridge plug is loosened, and the plugging efficiency is reduced are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of drillable bridge plugs, in particular to a composite material drillable bridge plug. Background Art

[0002] A drillable bridge plug is a downhole tool used to seal or isolate oil and gas wells. It primarily uses a setting mechanism to secure the bridge plug to the wellbore wall, using sealing rubber tubes and other components to achieve sealing. When removal is required, a special drill bit can be used to drill the plug apart, thereby clearing the wellbore passage. This is quick and convenient, requiring no effort to recover the plug.

[0003] At the same time, a composite material drillable bridge plug with application number 202020549081.1 relates to the field of bridge plug technology, including a center rubber cylinder, wherein both sides of the center rubber cylinder are fixedly connected with composite sheets, and the side of the composite sheet away from the center rubber cylinder is fixedly connected with a composite vertebra, and the side of the composite vertebra away from the composite sheet is fixedly connected with a drillable cava, and the left side of the center rubber cylinder is fixedly connected with an upper joint, and the right side of the center rubber cylinder is fixedly connected with a lower joint. The composite material drillable bridge plug can be clamped and fixed to each other at the head and tail ends when any two bridge plugs are connected, and the outer wall of the rubber layer contacts the inner wall of the arc-shaped block. The rubber layer is squeezed when it contacts the wear-resistant protrusion, which can increase the friction force and facilitate the mutual engagement between the bridge plugs. The circular through hole and the notch can release the extrusion force of excess air, and the clamping and fixing effect is better. At the same time, it can prevent the bridge plug from rotating during drilling and prevent it from sliding, thereby improving the working efficiency of milling.

[0004] An existing composite drillable bridge plug is fixed in place by air extrusion during use. When the slip contacts the wellbore wall, as the setting force continues to increase, the slip teeth gradually embed into the wellbore wall. However, if the slip is not locked during use, it may unexpectedly shrink during operation, causing the bridge plug to loosen and reducing the sealing efficiency.

[0005] Therefore, in order to solve the above problems, a composite material drillable bridge plug is proposed. Utility Model Content

[0006] In order to solve the problems raised in the above background technology, the utility model provides a composite material drillable bridge plug, which has the advantage of locking the position of the slips.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a composite material drillable bridge plug, comprising a central rubber cylinder, composite sheets fixedly connected at both ends of the central rubber cylinder, a composite vertebra fixedly connected on the side of the composite sheet away from the central rubber cylinder, a card slot being provided on the outer side of the middle part of the composite vertebra, a slip sleeve being provided on the outer side of one end of the composite vertebra, a metal straightening ring being inlaid on the outer side of the slip, a plurality of triangular card blocks being fixedly connected to the bottom end of the slip, and the cross-sectional area of ​​the triangular card blocks being the same as the cross-sectional area of ​​the card slot, and a connecting block being further provided on one side of the composite vertebra.

[0008] Preferably, the interior of the slip is inlaid with a support block, the four corners of the top of the support block are fixedly connected to springs, the top of the spring is fixedly connected to an arc plate, the top of the arc plate is fixedly connected to multiple groups of wear-resistant columns, and the wear-resistant columns are interspersed inside the slip.

[0009] Preferably, a plurality of sliding grooves are provided on the outer side of the composite vertebral body, and the cross-sectional area of ​​the sliding grooves is the same as the cross-sectional area of ​​the triangular clamping block.

[0010] Preferably, a through hole is opened in the middle of the connecting block, and the number of the through holes is six.

[0011] Preferably, a buffer washer is sleeved on the outer side of one end of the connecting block close to the slip, and the side surface of the buffer washer is in contact with one side of the slip.

[0012] Preferably, the top of the slip is provided with a wear-resistant coating, and the material of the wear-resistant coating is tungsten carbide.

[0013] Preferably, a rod is inserted into the lower part of the slip, and the rod is inserted into the interior of the support block.

[0014] Preferably, a limiting groove is provided on the outer side of the slip, and the bottom surface of the limiting groove is arc-shaped.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. The utility model uses triangular clamping blocks. When the setting structure applies pressure to the slips, the slips will gradually expand and gradually apply pressure to the wellbore wall. After the pressure is applied, the triangular clamping block at the bottom of the slips will also be stuck into the inside of the clamping groove to fix the position of the slips, preventing the slips from accidentally shrinking during operation, causing the bridge plug to loosen, and improving the sealing efficiency.

[0017] 2. The utility model increases the contact area between the slips and the wellbore wall by arranging wear-resistant columns, which are embedded in the interior of the wellbore wall. Since the wear-resistant columns are made of composite materials with good wear resistance and high strength, the damage caused by friction between the slips and the wellbore wall is reduced, so that the bridge plug can be stably fixed inside the wellbore wall, with high performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the explosive structure of the composite vertebral body of the utility model;

[0020] Figure 3 For this utility model Figure 1 Schematic diagram of the structure at A;

[0021] Figure 4 This is a schematic diagram of the position structure of the buffer washer of the utility model;

[0022] Figure 5 This is a schematic diagram of the cross-sectional structure of the slip of the utility model.

[0023] In the figure: 1. Center rubber cylinder; 2. Composite sheet; 3. Composite vertebra; 4. Slot; 5. Slip; 6. Metal straightening ring; 7. Triangular clamp; 8. Connecting block; 9. Support block; 10. Spring; 11. Arc plate; 12. Wear-resistant column; 13. Slide; 14. Through hole; 15. Buffer washer; 16. Wear-resistant coating; 17. Insert rod; 18. Limit groove. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] like Figures 1 to 5 As shown, the utility model provides a composite drillable bridge plug, including a central rubber cylinder 1, with composite sheets 2 fixedly connected at both ends of the central rubber cylinder 1, and a composite vertebra 3 fixedly connected to the side of the composite sheet 2 away from the central rubber cylinder 1, which can hold the slip 5 open, and a card slot 4 is provided on the outer side of the middle part of the composite vertebra 3, and a slip 5 is sleeved on the outer side of one end of the composite vertebra 3, and six slips are provided on one side of the slip 5, and a metal straightening ring 6 is inlaid on the outer side of the slip 5, and there are two metal straightening rings 6, which fix the slip 5 so that it always maintains the correct position and direction during the setting and working process, and a plurality of triangular blocks 7 are fixedly connected to the bottom end of the slip 5, and the cross-sectional area of ​​the triangular blocks 7 is the same as the cross-sectional area of ​​the card slot 4, so as to prevent the triangular blocks 7 from shaking inside the card slot 4 and improve stability, and a connecting block 8 is provided on one side of the composite vertebra 3.

[0026] Specifically, the interior of the slip 5 is inlaid with a support block 9, the bottom end of the support block 9 is flush with the bottom end of the slip 5, the four corners of the top of the support block 9 are fixedly connected with springs 10, the top of the spring 10 is fixedly connected with an arc plate 11, the top of the arc plate 11 is fixedly connected with multiple groups of wear-resistant columns 12, and the wear-resistant columns 12 are interspersed in the interior of the slip 5, and the wear-resistant columns 12 are composed of composite materials, which have good wear resistance, high strength, and long service life. They can be stably stuck inside the wellbore wall during operation to maintain the stability of the bridge plug.

[0027] Furthermore, multiple sets of slide grooves 13 are opened on the outside of the composite vertebral body 3, and the cross-sectional area of ​​the slide groove 13 is the same as the cross-sectional area of ​​the triangular clamping block 7, so that the triangular clamping block 7 can slide stably inside the slide groove 13, providing guidance for the movement of the slip 5 and improving stability.

[0028] Furthermore, a through hole 14 is opened in the middle of the connecting block 8, and there are six through holes 14, which makes it convenient for workers to connect other bridge plugs through the through holes 14.

[0029] It is worth noting that a buffer washer 15 is sleeved on the outer side of the end of the connecting block 8 close to the slip 5, and the side of the buffer washer 15 is in contact with one side of the slip 5. When the slip 5 is sealed, the buffer washer 15 is first compressed to absorb part of the energy, so that the slip 5 can be smoothly opened by the composite vertebra 3, so that the slip 5 can be smoothly opened and anchored on the wellbore wall.

[0030] It is worth noting that the top of the cava 5 is fitted with a wear-resistant coating 16, and the material of the wear-resistant coating 16 is tungsten carbide. The coating has high hardness (hardness can reach 1500-2000HV) and low friction coefficient, which can significantly reduce the friction and wear between the cava 5 and the wellbore wall, while improving its corrosion resistance, protecting the internal cava 5 and increasing its service life.

[0031] It is worth mentioning that the lower part of the cava 5 is connected with an insertion rod 17, and the insertion rod 17 is inserted into the inside of the support block 9. The insertion rod 17 can fix the position of the support block 9, improve the integrity of the cava 5 and the support block 9, and can maintain stable support for the internal spring 10.

[0032] It is worth emphasizing that a limiting groove 18 is provided on the outer side of the slip 5, and the bottom surface of the limiting groove 18 is arc-shaped, which is convenient for limiting the position of the metal straightening ring 6, so that it can ensure that the slip 5 always maintains the correct position and direction during the setting and working process.

[0033] Among them, the central rubber cylinder 1, the composite sheet 2 and the composite cone 3 are existing technologies and will not be described in detail; at the same time, the utility model also includes a power supply, a controller and a switch, which are not the main technical points of this patent and will not be described in detail.

[0034] Working principle and process:

[0035] When the bridge plug is lowered into the wellbore, the sealing structure is used to apply pressure to the slip 5. Under the action of the buffer washer 15, the buffer washer 15 is first compressed to absorb part of the energy, so that the slip 5 can be smoothly opened by the composite vertebra 3. The slip 5 drives the triangular block 7 to slide inside the slide groove 13 to prevent the slip 5 from deflecting. Then the slip 5 is gradually opened, and the wear-resistant column 12 first contacts the wellbore wall and gradually squeezes the wellbore wall and embeds into the inside of the wellbore wall, thereby increasing the contact area between the slip 5 and the wellbore wall to prevent loosening. The spring 10 inside the slip 5 also applies pressure to the arc plate 11, which exerts pressure on the wear-resistant column 12. The grinding column 12 applies pressure so that it can be stably embedded in the inside of the wellbore wall. The slip 5 contacts the wellbore wall and gradually applies pressure. After tightening, the triangular clamping block 7 will also be clamped into the inside of the clamping groove 4 to fix the position of the slip 5. Because the cross-sectional area of ​​the clamping groove 4 is triangular, it can effectively prevent the slip 5 from accidentally shrinking during operation, causing the bridge plug to loosen, thereby improving the sealing efficiency. Under the action of the wear-resistant coating 16, because it has high hardness and low friction coefficient, it can significantly reduce the friction and wear between the slip 5 and the wellbore wall, while improving its corrosion resistance, thereby increasing the service life of the slip 5 and the sealing efficiency of the bridge plug.

[0036] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A composite material drillable bridge plug, comprising a central rubber cylinder (1), characterized in that: The two ends of the central rubber cylinder (1) are fixedly connected with composite sheets (2), and the side of the composite sheet (2) away from the central rubber cylinder (1) is fixedly connected with a composite vertebra (3). A clamping groove (4) is provided on the outer side of the middle part of the composite vertebra (3). A slip (5) is sleeved on the outer side of one end of the composite vertebra (3). The outer side of the slip (5) is inlaid with a metal straightening ring (6). The bottom end of the slip (5) is fixedly connected with multiple groups of triangular clamping blocks (7), and the cross-sectional area of ​​the triangular clamping blocks (7) is the same as the cross-sectional area of ​​the clamping groove (4). One side of the composite vertebra (3) is further provided with a connecting block (8).

2. The composite drillable bridge plug according to claim 1, characterized in that: The interior of the slip (5) is inlaid with a support block (9), the four corners of the top of the support block (9) are fixedly connected to springs (10), the top of the spring (10) is fixedly connected to an arc plate (11), the top of the arc plate (11) is fixedly connected to multiple groups of wear-resistant columns (12), and the wear-resistant columns (12) are inserted into the interior of the slip (5).

3. The composite material drillable bridge plug according to claim 1, characterized in that: The outer side of the composite vertebral body (3) is provided with a plurality of sliding grooves (13), and the cross-sectional area of ​​the sliding grooves (13) is the same as the cross-sectional area of ​​the triangular clamping block (7).

4. The composite material drillable bridge plug according to claim 1, characterized in that: A through hole (14) is provided in the middle of the connecting block (8), and there are six through holes (14).

5. The composite material drillable bridge plug according to claim 1, characterized in that: A buffer washer (15) is sleeved on the outer side of one end of the connecting block (8) close to the slip (5), and the side surface of the buffer washer (15) is in contact with one side of the slip (5).

6. The composite material drillable bridge plug according to claim 1, characterized in that: The top end of the slip (5) is fitted with a wear-resistant coating (16), and the material of the wear-resistant coating (16) is tungsten carbide.

7. The composite material drillable bridge plug according to claim 1, characterized in that: The lower part of the slip (5) is connected with an insertion rod (17), and the insertion rod (17) is inserted into the interior of the support block (9).

8. The composite material drillable bridge plug according to claim 1, characterized in that: A limiting groove (18) is provided on the outer side of the slip (5), and the bottom surface of the limiting groove (18) is arc-shaped.

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