Bridge plug tool capable of releasing

Abstract

The utility model relates to the technical field of downhole tools, in particular to a releasing bridge plug tool which comprises a central pipe, a baffle ring, an upper slip, an upper cone, a rubber sleeve assembly, a lower cone, a lower slip, a guide shoe, a releasing bolt and a one-way locking assembly. A one-way locking assembly capable of preventing the baffle ring from ascending relative to the center pipe is arranged between the baffle ring and the center pipe, a guiding shoe is fixedly installed on the outer side of the lower end of the center pipe, and an upper slip, an upper cone, a rubber sleeve assembly, a lower cone and a lower slip are sequentially arranged on the outer side of the position, corresponding to the position between the one-way locking assembly and the guiding shoe, of the center pipe from top to bottom. The locking device is reasonable in structure and convenient to use, and the central pipe can be prevented from moving upwards relative to the locking ring through the outer retaining teeth and the inner retaining teeth; by arranging an anti-rotation key block, the lower cone can be prevented from rotating in the axial direction, and downward movement of the lower cone is guided; by arranging the releasing bolt, releasing can be completed when the releasing bolt is snapped, and the releasing device has the advantages of being efficient, stable and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of downhole tools and is a disposable bridge plug tool. Background Art

[0002] With the continuous deepening of oilfield exploration, searching for oil and gas resources from shallow to deep layers is an important material basis for the sustained high production of oilfields. The complexity of deep reservoir lithology puts higher requirements on oil production technology. As the main tool for stratified oil production, bridge plugs are widely used in oil production projects. Existing bridge plug tools mostly use the method of shearing shear nails to complete the release, which has the problem of unstable release method; in addition, the existing bridge plugs use an integral rubber cylinder structure, which is not effective. Summary of the invention

[0003] The utility model provides a disposable bridge plug tool, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problem of unstable disposability of the prior bridge plug tool.

[0004] The technical solution of the utility model is achieved through the following measures: a disposable bridge plug tool, comprising a center tube, a retaining ring, an upper slip, an upper cone, a rubber cartridge assembly, a lower cone, a lower slip, a guide shoe, a release bolt and a one-way locking assembly; a retaining ring is fixedly installed on the outer side of the upper end of the center tube by starting shear nails; a one-way locking assembly that can prevent the retaining ring from moving upward relative to the center tube is provided between the retaining ring and the center tube; a guide shoe is fixedly installed on the outer side of the lower end of the center tube; an upper slip, an upper cone, a rubber cartridge assembly, a lower cone and a lower slip are sequentially provided from top to bottom on the outer side of the center tube corresponding to the position between the one-way locking assembly and the guide shoe; the upper cone and the lower cone are fixedly installed together with the center tube by setting shear nails; a release bolt with an upper end located above it is fixedly installed on the inner side of the upper end of the center tube.

[0005] The following are further optimizations and / or improvements to the above utility model technical solution:

[0006] The above-mentioned may also include an anti-rotation key block, the upper end of the upper slip is abutted against the lower end of the one-way locking assembly, and the inner side of the lower part of the upper slip can expand radially outward when subjected to outward extrusion pressure, the upper part of the upper cone is in the shape of a truncated cone with a small upper part and a large lower part, and the upper end of the upper cone section is located on the inner side of the lower end of the upper slip; the lower end of the lower slip is abutted against the upper end of the guide shoe, and the inner side of the upper part of the lower slip can expand radially outward when subjected to outward extrusion pressure, the lower part of the lower cone is in the shape of a truncated cone with a large upper part and a small lower part, and the lower end of the lower cone section is located on the inner side of the upper end of the lower slip; slip teeth are provided on the outer sides of the upper slip and the lower slip, an anti-rotation key slot is provided on the inner side of the lower end of the lower cone, and an anti-rotation key block is provided at the corresponding position of the center tube with the outer end located at the lower part of the anti-rotation key slot.

[0007] The above-mentioned rubber cylinder assembly may include an upper end ring, an upper rubber cylinder, a middle rubber cylinder, a lower rubber cylinder and a lower end ring which are arranged in sequence from top to bottom, the upper end face of the upper rubber cylinder is inclined with an inner high and an outer low shape, the lower end face of the upper rubber cylinder is inclined with an inner high and an outer high shape, the upper end face of the middle rubber cylinder is inclined with an inner high and an outer low shape, the lower end face of the middle rubber cylinder is inclined with an inner low and an outer high shape, the upper end face of the lower rubber cylinder is inclined with an inner low and an outer high shape, and the lower end face of the lower rubber cylinder is inclined with an inner low and an outer high shape; an upper end ring is provided on the outer side of the upper end of the upper rubber cylinder, and a lower end ring is provided on the outer side of the lower end of the lower rubber cylinder.

[0008] The above-mentioned one-way locking assembly may include a locking sleeve, an outer stop tooth, a locking ring, an inner stop tooth and an anti-rotation screw. A locking sleeve is fixedly installed on the inner side of the lower end of the retaining ring, and a locking ring is fixedly installed on the inner side of the upper end of the locking sleeve. At least one group of inner stop teeth are continuously arranged on the inner side of the locking ring from top to bottom. The inner stop teeth are ring platforms with a right-angled triangle cross-section, and the ring platforms are wide at the top and narrow at the bottom. An outer side of the upper part of the center tube corresponding to the position of the locking ring is provided with outer stop teeth matching the inner stop teeth. The outer stop teeth are ring platforms with a right-angled triangle cross-section, and the ring platforms are narrow at the top and wide at the bottom. An anti-rotation groove is distributed along the circumference of the outer side of the locking ring, which runs through from top to bottom. At least one anti-rotation screw is arranged on the outer side of the locking sleeve corresponding to the position of the anti-rotation groove, and the inner end of each anti-rotation screw is located in the anti-rotation groove.

[0009] The above may also include a locking screw, a guide shoe is fixedly installed on the outer side of the lower end of the center tube through a threaded connection, four locking screws are arranged at intervals along the circumference on the outer side of the upper part of the guide shoe, which can fix the guide shoe and the center tube together, a locking sleeve is fixedly installed on the inner side of the lower end of the retaining ring through a threaded connection, and a locking ring is fixedly installed on the inner side of the upper end of the locking sleeve through a threaded connection.

[0010] A release bolt with its upper end located above the center tube can be fixedly installed on the inner side of the upper end of the center tube through a threaded connection. An external thread is arranged on the outer side of the upper end of the release bolt, and a breaking groove is arranged on the outer side of the lower part of the release bolt corresponding to the upper position of the center tube.

[0011] The utility model has a reasonable structure and is easy to use. The outer stop teeth and the inner stop teeth can prevent the center tube from moving upward relative to the lock ring. The anti-rotation key block is provided to prevent the lower cone from rotating axially and guide the lower cone downward. The release bolt is provided to complete the release when the release bolt is broken, and the utility model has the characteristics of high efficiency, stability and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Attached Figure 1 It is a schematic diagram of the main structure of embodiments 1 to 6 of the present utility model.

[0013] Attached Figure 2 For attachment Figure 1 Schematic diagram of the local enlarged structure at point A.

[0014] The codes in the accompanying drawings are: 1 is the center tube, 2 is the retaining ring, 3 is the upper slip, 4 is the upper cone, 5 is the lower cone, 6 is the lower slip, 7 is the guide shoe, 8 is the release bolt, 9 is the anti-rotation key block, 10 is the anti-rotation key slot, 11 is the upper end ring, 12 is the upper rubber cylinder, 13 is the middle rubber cylinder, 14 is the lower rubber cylinder, 15 is the lower end ring, 16 is the locking sleeve, 17 is the outer anti-retraction tooth, 18 is the locking ring, 19 is the inner anti-retraction tooth, 20 is the anti-rotation screw, 21 is the set screw, 22 is the break groove, 23 is the starting shear nail, and 24 is the sealing shear nail. DETAILED DESCRIPTION

[0015] The present invention is not limited by the following embodiments, and specific implementation methods can be determined according to the technical solution of the present invention and actual conditions.

[0016] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached manual. Figure 1 The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0017] The present invention is further described below in conjunction with the embodiments and drawings:

[0018] Embodiment 1: As attached Figure 1 , 2As shown, the disposable bridge plug tool includes a center pipe 1, a retaining ring 2, an upper slip 3, an upper cone 4, a rubber cartridge assembly, a lower cone 5, a lower slip 6, a guide shoe 7, a release bolt 8 and a one-way locking assembly. The retaining ring 2 is fixedly installed on the outer side of the upper end of the center pipe 1 by starting shear nails 23, and a one-way locking assembly that can prevent the retaining ring 2 from moving upward relative to the center pipe 1 is provided between the retaining ring 2 and the center pipe 1. A guide shoe 7 is fixedly installed on the outer side of the lower end of the center pipe 1, and an upper slip 3, an upper cone 4, a rubber cartridge assembly, a lower cone 5 and a lower slip 6 are arranged on the outer side of the center pipe 1 corresponding to the position between the one-way locking assembly and the guide shoe 7 from top to bottom. The upper cone 4 and the lower cone 5 are fixedly installed together with the center pipe 1 by setting shear nails 24; a release bolt 8 with its upper end located above it is fixedly installed on the inner side of the upper end of the center pipe 1. During use, the present embodiment is connected with the upper tubular column and the sealing tool through the release bolt 8 and then lowered to a predetermined position underground. By throwing a ball into the sealing tool in the tubular column, the pressure is continuously pumped into the tubular column, so that the liquid pushes the retaining ring 2 provided in the present embodiment to move downward through the piston provided on the sealing tool, and cuts the starting shear nail 23. At this time, under the action of the one-way locking assembly, the retaining ring 2 moves downward relative to the central pipe 1, cuts the sealing shear nail 24, and the retaining ring 2 and the one-way locking assembly push the upper slip 3, the upper cone 4, the rubber cylinder assembly, the lower cone 5 and the lower slip 6 to be squeezed toward the guide shoe 7, thereby realizing the hanging of the upper slip 3 and the lower slip 6 and the sealing of the rubber cylinder assembly; by setting the release bolt 8, the pumping pressure can be continued after the sealing is completed. When the pressure reaches the breaking value of the release bolt 8, the release bolt 8 is broken, so that the upper tubular column and the sealing tool of the present embodiment are separated from the present embodiment, and the release is completed.

[0019] The above-mentioned disposable bridge plug tool can be further optimized and / or improved according to actual needs:

[0020] Embodiment 2: As attached Figure 1 , 2As shown, it also includes an anti-rotation key block 9, the upper end of the upper slip 3 is abutted against the lower end of the one-way locking assembly, and the inner side of the lower part of the upper slip 3 can expand radially outward when subjected to outward extrusion pressure, the upper part of the upper cone 4 is in the shape of a truncated cone with a small upper part and a large lower part, and the upper end of the upper cone section is located on the inner side of the lower end of the upper slip 3; the lower end of the lower slip 6 is abutted against the upper end of the guide shoe 7, and the inner side of the upper part of the lower slip 6 can expand radially outward when subjected to outward extrusion pressure, the lower part of the lower cone 5 is in the shape of a truncated cone with a large upper part and a small lower part, and the lower end of the lower cone section is located on the inner side of the upper end of the lower slip 6; slip teeth are provided on the outer sides of the upper slip 3 and the lower slip 6, and an anti-rotation key groove 10 arranged in a vertical direction is provided on the inner side of the lower end of the lower cone 5, and an anti-rotation key block 9 with an outer end located below the anti-rotation key groove 10 is provided at a corresponding position of the center pipe 1. During use, the anti-rotation key block 9 is provided to prevent the lower cone 5 from rotating in the axial direction on the one hand, and guide the lower cone 5 downward on the other hand; the upper and lower cones 4 and 5 are provided to achieve radial outward expansion of the upper and lower slips 3 and 6, thereby completing the hanging rivet. According to the requirements, the slip teeth can be made of existing well-known materials, such as ceramics or hard alloy particles.

[0021] Embodiment 3: As attached Figure 1 , 2 As shown, the rubber cylinder assembly includes an upper end ring 11, an upper rubber cylinder 12, a middle rubber cylinder 13, a lower rubber cylinder 14 and a lower end ring 15 which are arranged in sequence from top to bottom. The upper end surface of the upper rubber cylinder 12 is inclined in a state of high inside and low outside, the lower end surface of the upper rubber cylinder 12 is inclined in a state of high inside and high outside, the upper end surface of the middle rubber cylinder 13 is inclined in a state of high inside and low outside, the lower end surface of the middle rubber cylinder 13 is inclined in a state of low inside and high outside, the upper end surface of the lower rubber cylinder 14 is inclined in a state of low inside and high outside, and the lower end surface of the lower rubber cylinder 14 is inclined in a state of low inside and high outside; the upper end ring 11 is arranged on the outer side of the upper end of the upper rubber cylinder 12, and the lower end ring 15 is arranged on the outer side of the lower end of the lower rubber cylinder 14. During use, by setting the interacting conical surfaces, the upper rubber cylinder 12, the middle rubber cylinder 13 and the lower rubber cylinder 14 are conveniently deformed after being squeezed, so as to better compress the rubber cylinder assembly so that it can completely fit the casing to achieve sealing. According to the requirements, this application adopts a "double copper bowl and three rubber cylinder" structure to form a reliable sealing system, in which the upper end ring 11 and the lower end ring 15 can both adopt a double back ring structure, and the outer back ring adopts #20 steel cut seam, which has better pressure-bearing effect; the inner back ring adopts T2 pure copper, which can provide radial support for the rubber cylinder after sealing.

[0022] Embodiment 4: As attached Figure 1 , 2As shown, the one-way locking assembly includes a locking sleeve 16, an outer stop tooth 17, a locking ring 18, an inner stop tooth 19 and an anti-rotation screw 20. The locking sleeve 16 is fixedly installed on the inner side of the lower end of the retaining ring 2, and the locking ring 18 is fixedly installed on the inner side of the upper end of the locking sleeve 16. At least one group of inner stop teeth 19 are continuously arranged on the inner side of the locking ring 18 from top to bottom. The inner stop teeth 19 are ring platforms with a right-angled triangle cross-section, which are wide on the top and narrow on the bottom. The outer side of the upper part of the center tube 1 corresponding to the position of the locking ring 18 is provided with an outer stop tooth 17 matching the inner stop teeth 19. The outer stop tooth 17 is a ring platform with a right-angled triangle cross-section, which is narrow on the top and wide on the bottom; the outer side of the locking ring 18 is distributed along the circumference with an anti-rotation groove that runs through from top to bottom, and at least one anti-rotation screw 20 is arranged on the outer side of the locking sleeve 16 corresponding to the position of the anti-rotation groove, and the inner end of each anti-rotation screw 20 is located in the anti-rotation groove. During use, such an arrangement can prevent the center tube 1 from moving upward relative to the locking ring 18, thereby achieving a one-way locking function. The one-way ratchet locking ring used can continuously maintain the sealing force.

[0023] Embodiment 5: As attached Figure 1 , 2 As shown, it also includes a set screw 21, a guide shoe 7 is fixedly installed on the outer side of the lower end of the center tube 1 through a threaded connection, four set screws 21 are arranged along the circumference of the outer side of the upper part of the guide shoe 7 to fix the guide shoe 7 and the center tube 1 together, a locking sleeve 16 is fixedly installed on the inner side of the lower end of the retaining ring 2 through a threaded connection, and a locking ring 18 is fixedly installed on the inner side of the upper end of the locking sleeve 16 through a threaded connection. In the process of use, such a setting facilitates the connection and fixation between the various components.

[0024] Embodiment 6: As attached Figure 1 , 2 As shown, a release bolt 8 with an upper end located above the central tube 1 is fixedly installed on the inner side of the upper end thereof through a threaded connection, an external thread is arranged on the outer side of the upper end of the release bolt 8, and a break groove 22 is arranged on the outer side of the lower part of the release bolt 8 corresponding to the upper position of the central tube 1. During use, the external thread is arranged to facilitate connection with the upper pipe column; the break groove 22 is arranged to facilitate breaking the release bolt 8 and complete the release.

[0025] The above technical features constitute the best implementation example of the present utility model, which has strong adaptability and best implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the requirements of different situations.

Claims

1. A disposable bridge plug tool, characterized in that It includes a center pipe, a retaining ring, an upper slip, an upper cone, a rubber cylinder assembly, a lower cone, a lower slip, a guide shoe, a release bolt and a one-way locking assembly. A retaining ring is fixedly installed on the outer side of the upper end of the center pipe by starting shear nails. A one-way locking assembly that can prevent the retaining ring from moving upward relative to the center pipe is provided between the retaining ring and the center pipe. A guide shoe is fixedly installed on the outer side of the lower end of the center pipe. An upper slip, an upper cone, a rubber cylinder assembly, a lower cone and a lower slip are arranged on the outer side of the center pipe corresponding to the position between the one-way locking assembly and the guide shoe in sequence from top to bottom. The upper cone and the lower cone are fixedly installed together with the center pipe by setting shear nails; a release bolt with an upper end located above it is fixedly installed on the inner side of the upper end of the center pipe.

2. The disposable bridge plug tool according to claim 1, characterized in that It also includes an anti-rotation key block, the upper end of the upper slip is abutted against the lower end of the one-way locking assembly, and the inner side of the lower part of the upper slip can expand radially outward when subjected to outward extrusion pressure, the upper part of the upper cone is in the shape of a truncated cone with a small upper part and a large lower part, and the upper end of the upper cone section is located on the inner side of the lower end of the upper slip; the lower end of the lower slip is abutted against the upper end of the guide shoe, and the inner side of the upper part of the lower slip can expand radially outward when subjected to outward extrusion pressure, the lower part of the lower cone is in the shape of a truncated cone with a large upper part and a small lower part, and the lower end of the lower cone section is located on the inner side of the upper end of the lower slip; slip teeth are provided on the outer sides of the upper slip and the lower slip, an anti-rotation key slot is provided on the inner side of the lower end of the lower cone, and an anti-rotation key block is provided at the corresponding position of the center tube with the outer end located at the lower part of the anti-rotation key slot.

3. The disposable bridge plug tool according to claim 1 or 2, characterized in that The rubber cylinder assembly includes an upper end ring, an upper rubber cylinder, a middle rubber cylinder, a lower rubber cylinder and a lower end ring which are arranged in sequence from top to bottom. The upper end face of the upper rubber cylinder is inclined with an inner high and an outer low shape, the lower end face of the upper rubber cylinder is inclined with an inner high and an outer high shape, the upper end face of the middle rubber cylinder is inclined with an inner high and an outer low shape, the lower end face of the middle rubber cylinder is inclined with an inner low and an outer high shape, the upper end face of the lower rubber cylinder is inclined with an inner low and an outer high shape, and the lower end face of the lower rubber cylinder is inclined with an inner low and an outer high shape; an upper end ring is provided on the outer side of the upper end of the upper rubber cylinder, and a lower end ring is provided on the outer side of the lower end of the lower rubber cylinder.

4. The disposable bridge plug tool according to claim 1 or 2, characterized in that The one-way locking assembly includes a locking sleeve, an outer stop tooth, a locking ring, an inner stop tooth and an anti-rotation screw. A locking sleeve is fixedly installed on the inner side of the lower end of the retaining ring, and a locking ring is fixedly installed on the inner side of the upper end of the locking sleeve. At least one group of inner stop teeth are continuously arranged on the inner side of the locking ring from top to bottom. The inner stop teeth are ring platforms with a right-angled triangle cross-section, which are wide on the top and narrow on the bottom. An outer stop tooth matching the inner stop teeth is arranged on the outer side of the upper part of the center tube corresponding to the position of the locking ring. The outer stop tooth is a ring platform with a right-angled triangle cross-section, which is narrow on the top and wide on the bottom. An anti-rotation groove is distributed along the circumference of the outer side of the locking ring, which runs through from top to bottom. At least one anti-rotation screw is arranged on the outer side of the locking sleeve corresponding to the position of the anti-rotation groove, and the inner end of each anti-rotation screw is located in the anti-rotation groove.

5. The disposable bridge plug tool according to claim 3, characterized in that The one-way locking assembly includes a locking sleeve, an outer stop tooth, a locking ring, an inner stop tooth and an anti-rotation screw. A locking sleeve is fixedly installed on the inner side of the lower end of the retaining ring, and a locking ring is fixedly installed on the inner side of the upper end of the locking sleeve. At least one group of inner stop teeth are continuously arranged on the inner side of the locking ring from top to bottom. The inner stop teeth are ring platforms with a right-angled triangle cross-section, which are wide on the top and narrow on the bottom. An outer stop tooth matching the inner stop teeth is arranged on the outer side of the upper part of the center tube corresponding to the position of the locking ring. The outer stop tooth is a ring platform with a right-angled triangle cross-section, which is narrow on the top and wide on the bottom. An anti-rotation groove is distributed along the circumference of the outer side of the locking ring, which runs through from top to bottom. At least one anti-rotation screw is arranged on the outer side of the locking sleeve corresponding to the position of the anti-rotation groove, and the inner end of each anti-rotation screw is located in the anti-rotation groove.

6. The disposable bridge plug tool according to claim 4, characterized in that It also includes a locking screw, a guide shoe is fixedly installed on the outer side of the lower end of the center tube through a threaded connection, four locking screws are arranged at intervals along the circumference of the outer side of the upper part of the guide shoe, which can fix the guide shoe and the center tube together, a locking sleeve is fixedly installed on the inner side of the lower end of the retaining ring through a threaded connection, and a locking ring is fixedly installed on the inner side of the upper end of the locking sleeve through a threaded connection.

7. The disposable bridge plug tool according to claim 5, characterized in that It also includes a locking screw, a guide shoe is fixedly installed on the outer side of the lower end of the center tube through a threaded connection, four locking screws are arranged at intervals along the circumference of the outer side of the upper part of the guide shoe, which can fix the guide shoe and the center tube together, a locking sleeve is fixedly installed on the inner side of the lower end of the retaining ring through a threaded connection, and a locking ring is fixedly installed on the inner side of the upper end of the locking sleeve through a threaded connection.

8. The disposable bridge plug tool according to claim 1 or 2 or 5 or 6 or 7, characterized in that A release bolt with its upper end located above the center tube is fixedly installed on the inner side of the upper end of the center tube through a threaded connection. An external thread is arranged on the outer side of the upper end of the release bolt, and a breaking groove is arranged on the outer side of the lower part of the release bolt corresponding to the upper position of the center tube.

9. The disposable bridge plug tool according to claim 3, characterized in that A release bolt with its upper end located above the center tube is fixedly installed on the inner side of the upper end of the center tube through a threaded connection. An external thread is arranged on the outer side of the upper end of the release bolt, and a breaking groove is arranged on the outer side of the lower part of the release bolt corresponding to the upper position of the center tube.

10. The disposable bridge plug tool according to claim 4, characterized in that A release bolt with its upper end located above the center tube is fixedly installed on the inner side of the upper end of the center tube through a threaded connection. An external thread is arranged on the outer side of the upper end of the release bolt, and a breaking groove is arranged on the outer side of the lower part of the release bolt corresponding to the upper position of the center tube.

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