CN210768644U

CN210768644U - Self-opening hydraulic centralizer

Info

Publication number: CN210768644U
Application number: CN201921597008.5U
Authority: CN
Inventors: 李富强; 宋朝晖; 乔东宇; 朱年涛; 钟宁龙; 谷浩; 唐玉科; 程海东
Original assignee: China National Petroleum Corp; CNPC Xibu Drilling Engineering Co Ltd
Current assignee: China National Petroleum Corp; CNPC Xibu Drilling Engineering Co Ltd
Priority date: 2019-09-24
Filing date: 2019-09-24
Publication date: 2020-06-16
Anticipated expiration: 2029-09-24

Abstract

The utility model relates to the technical field of well cementation tools, in particular to a self-opening hydraulic centralizer, which comprises an upper joint, a mandrel, a pushing cylinder, shear pins, a supporting bar and a lower joint, wherein the inner side of the lower end of the upper joint is fixedly installed with the outer side of the upper end of the mandrel, a first sealing ring platform is arranged on the outer side of the middle part of the mandrel, the pushing cylinder with the upper part positioned above the first sealing ring platform is sleeved on the outer side of the middle part of the mandrel, and the middle part of the pushing cylinder is fixedly installed with the first sealing ring platform through the shear pins; a second sealing ring table is arranged on the inner side of the upper part of the pushing cylinder corresponding to the position above the first sealing ring table, and a first ring cavity is arranged between the pushing cylinder corresponding to the position above the second sealing ring table and the mandrel. The utility model has the advantages of reasonable and compact structure, convenient to use, through the pressure differential of dabber internal pressure and dabber external pressure, cut the shear pin and promote to push away and push away a section of thick bamboo down, make the radial expansion of support bar, realize righting between two parties by oneself, have reliably, stably and support and right effectual characteristics.

Description

Self-opening hydraulic centralizer

Technical Field

The utility model relates to a well cementation operation tool technical field is a from open-type hydraulic pressure centralizer.

Background

The well cementation operation is an important technical means for connecting well drilling and oil extraction operation, and meanwhile, well cementation is underground operation with great risk, so whether the well cementation operation is successful or not directly results in success or failure of one well. Particularly, with the continuous and deep exploration of unconventional oil and gas fields such as shale gas, compact oil and the like, the research on the development of the oil and gas reservoirs is continuously strengthened. The well cementation operation is an important technical means for ensuring the service life and the yield of the well, the number of drilled wells is increased increasingly along with the further penetration of the exploration and development work of petroleum and natural gas, the geological conditions and the construction working conditions are complicated increasingly, and great challenges are brought to the well cementation construction. The well cementation operation not only relates to whether the oil and gas well can be finished smoothly, and influences the quality of the oil and gas well after production, the service life of the oil and gas well and the yield of the oil and gas well, but also has the cost occupying a great density (accounting for 20 percent to 30 percent) in the whole drilling engineering. At present, a downhole casing does not have a centering function, so that the deviated casing in a well can influence the well cementation quality.

Disclosure of Invention

The invention provides a self-opening hydraulic centralizer, which overcomes the defects of the prior art and can effectively solve the problem that the existing underground casing cannot be centered.

The technical scheme of the utility model is realized through following measure: a self-opening hydraulic centralizer comprises an upper joint, a mandrel, a pushing cylinder, a shear pin, a supporting bar and a lower joint, wherein the inner side of the lower end of the upper joint is fixedly installed with the outer side of the upper end of the mandrel; a second sealing ring platform is arranged on the inner side of the upper part of the pushing cylinder corresponding to the position above the first sealing ring platform, a first ring cavity is arranged between the pushing cylinder corresponding to the position above the second sealing ring platform and the mandrel, an external pressure gap capable of being communicated with the first ring cavity is arranged between the lower end of the upper joint and the upper end of the pushing cylinder, a second ring cavity is arranged between the pushing cylinder corresponding to the position between the first sealing ring platform and the second sealing ring platform and the mandrel, and at least one internal pressure hole which is communicated with the inside and the outside is arranged on the upper part of the mandrel corresponding to the position of the second ring cavity; a backstop device capable of preventing the pushing cylinder from moving upwards relative to the mandrel is arranged between the inner side of the lower part of the pushing cylinder and the first sealing ring platform; the outer side of the lower end of the mandrel is fixedly provided with a lower joint, at least two supporting strips are distributed on the outer side of the lower part of the mandrel at intervals along the circumference corresponding to the position between the pushing cylinder and the lower joint, the upper ends of the supporting strips are fixedly arranged together with the corresponding position of the pushing cylinder, and the lower ends of the supporting strips are fixedly arranged together with the corresponding position of the lower joint.

The following are further optimization or/and improvement of the technical scheme of the utility model:

the anti-return device can comprise a locking ring, inner anti-return teeth, outer anti-return teeth and anti-rotation pins, the inner side of the lower part of the pushing cylinder is fixedly provided with the locking ring, the inner side of the locking ring is provided with at least one group of inner anti-return teeth at intervals from top to bottom, the inner anti-return teeth are ring platforms with straight trapezoidal sections, the ring platforms are wide at the top and narrow at the bottom, a plurality of groups of outer anti-return teeth matched with the inner anti-return teeth are arranged at intervals from top to bottom on the outer side of a first sealing ring platform corresponding to the position between the locking ring and the supporting strip, and the outer anti-return teeth are ring platforms with straight trapezoidal sections, and; the lock ring is provided with an anti-rotation opening which is communicated up and down, at least one anti-rotation pin is arranged on the outer side of the pushing cylinder corresponding to the position of the anti-rotation opening, and the inner end of each anti-rotation pin is positioned in the anti-rotation opening.

The device also comprises an O-shaped sealing ring, at least one O-shaped sealing ring is arranged between the second sealing ring platform and the mandrel at intervals up and down, and at least one O-shaped sealing ring is arranged between the first sealing ring platform and the pushing cylinder at intervals up and down corresponding to the position between the inner pressure hole and the shear pin.

The support bar pushing device can also comprise an upper fixing pin, an upper inner ring groove is arranged on the inner side of the lower end of the pushing cylinder, the upper ends of the support bars are positioned in the upper inner ring groove, and an upper fixing pin capable of fixedly mounting the support bars and the pushing cylinder is arranged on the outer side of the lower part of the pushing cylinder corresponding to the upper end of each support bar.

The aforesaid still can be including fixing pin down, and the lower clutch upper end inboard is equipped with down the inner ring groove, and the support bar lower extreme all is located down the inner ring inslot, corresponds the lower clutch upper portion outside of every support bar lower extreme position and all is equipped with the lower fixing pin that can be in the same place the two fixed mounting.

The inner side of the lower end of the upper joint and the outer side of the upper end of the mandrel can be fixedly installed together through threaded connection, the outer side of the lower end of the mandrel and the inner side of the upper end of the lower joint can be fixedly installed together through threaded connection, and the inner side of the lower part of the pushing cylinder and the locking ring can be fixedly installed together through threaded connection.

The utility model has the advantages of reasonable and compact structure, convenient to use, through the pressure differential of dabber internal pressure and dabber external pressure, cut the shear pin and promote to push away and push away a section of thick bamboo down, make the radial expansion of support bar, realize righting between two parties by oneself, have reliably, stably and support and right effectual characteristics.

Drawings

Fig. 1 is a schematic structural view of the preferred embodiment of the present invention.

Fig. 2 is a partially enlarged schematic view at a in fig. 1.

The codes in the figures are respectively: the device comprises a base, a support, a lower joint, an upper joint, a mandrel, a pushing cylinder, a shear pin, a support bar, a lower joint, a first sealing ring table, a second sealing ring table, a first ring cavity, a second ring cavity, an inner pressure hole, a locking ring, an inner stopping tooth, an outer stopping tooth, an O-shaped sealing ring, an upper fixing pin and a lower fixing pin, wherein the base is 1, the mandrel is 2, the pushing cylinder is 3, the shear pin is 4, the support bar is 5, the lower joint is 6, the first sealing ring table is 7.

Detailed Description

The utility model discloses do not receive the restriction of following embodiment, can be according to the utility model discloses a technical scheme and actual conditions determine concrete implementation.

In the present invention, for convenience of description, the description of the relative position relationship of the components is described according to the layout mode of the attached drawing 1 in the specification, such as: the positional relationship of front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of the drawings of the specification.

The invention will be further described with reference to the following examples and drawings:

as shown in the attached drawings 1 and 2, the self-opening hydraulic centralizer comprises an upper connector 1, a mandrel 2, a pushing cylinder 3, shear pins 4, a supporting strip 5 and a lower connector 6, wherein the inner side of the lower end of the upper connector 1 is fixedly installed with the outer side of the upper end of the mandrel 2, a first sealing ring table 7 is arranged on the outer side of the middle part of the mandrel 2, the pushing cylinder 3 with the upper part positioned above the first sealing ring table 7 is sleeved on the outer side of the middle part of the mandrel 2, and the middle part of the pushing cylinder 3 is fixedly installed with the first sealing ring table 7 through the shear pins 4; a second sealing ring platform 8 is arranged on the inner side of the upper part of the pushing cylinder 3 corresponding to the position above the first sealing ring platform 7, a first ring cavity 9 is arranged between the pushing cylinder 3 corresponding to the position above the second sealing ring platform 8 and the mandrel 2, an external pressure gap 10 capable of being communicated with the first ring cavity 9 is arranged between the lower end of the upper joint 1 and the upper end of the pushing cylinder 3, a second ring cavity 11 is arranged between the pushing cylinder 3 corresponding to the position between the first sealing ring platform 7 and the second sealing ring platform 8 and the mandrel 2, and at least one internal pressure hole 12 which is communicated with the inside and the outside is arranged on the upper part of the mandrel 2 corresponding to the position of the second ring cavity 11; a backstop device capable of preventing the pushing cylinder 3 from moving upwards relative to the mandrel 2 is arranged between the inner side of the lower part of the pushing cylinder 3 and the first sealing ring platform 7; the outer side of the lower end of the mandrel 2 is fixedly provided with a lower joint 6, at least two supporting strips 5 are distributed on the outer side of the lower part of the mandrel 2 at intervals along the circumference corresponding to the position between the pushing cylinder 3 and the lower joint 6, the upper ends of the supporting strips 5 are fixedly arranged together with the corresponding position of the pushing cylinder 3, and the lower ends of the supporting strips 5 are fixedly arranged together with the corresponding position of the lower joint 6. When in use, the utility model is connected with the prior known pipe string and is put down into the well, when in well cementation, cement slurry is injected into the pipe string, so that the cement slurry enters the annular cavity between the outer side of the pipe string and the inner side of the well wall from the lower end of the pipe string, the cement slurry enters the first annular cavity 9 through the external pressure gap 10, then, the displacement liquid is injected into the pipe string and enters the second ring cavity 11 through the inner pressure hole 12, because the specific gravity of the cement paste is higher than that of the displacement liquid, the pressure in the first ring cavity 9 is higher than that in the second ring cavity 11, so that the pushing cylinder 3 descends relative to the mandrel 2, because the lower joint 6 is fixedly arranged with the lower end of the mandrel 2, the lower joint 6 has the function of limiting the supporting strip 5, therefore, the pushing cylinder 3 moving downwards presses the supporting bars 5, so that the middle parts of the supporting bars 5 radially expand outwards and contact with the well wall, and self-centering and centering are realized.

The self-opening hydraulic centralizer can be further optimized or/and improved according to actual needs:

as shown in the attached drawings 1 and 2, the retaining device comprises a locking ring 13, inner retaining teeth 14, outer retaining teeth 15 and anti-rotation pins, the inner side of the lower part of the pushing cylinder 3 is fixedly provided with the locking ring 13, at least one group of inner retaining teeth 14 is arranged on the inner side of the locking ring 13 at intervals from top to bottom, the inner retaining teeth 14 are circular platforms with straight trapezoidal sections and are wide at the top and narrow at the bottom, a plurality of groups of outer retaining teeth 15 matched with the inner retaining teeth 14 are arranged on the outer side of the first sealing circular platform 7 corresponding to the position between the locking ring 13 and the supporting bar 5 at intervals from top to bottom, and the outer retaining teeth 15 are circular platforms with straight trapezoidal sections and are narrow at the top and wide at the bottom; the locking ring 13 is provided with an anti-rotation opening which is through up and down, at least one anti-rotation pin is arranged on the outer side of the pushing cylinder 3 corresponding to the position of the anti-rotation opening, and the inner end of each anti-rotation pin is positioned in the anti-rotation opening. According to the requirement, the locking ring 13 can be a known split ring, and the anti-rotation notch is an opening of the split ring. In use, the pushing cylinder 3 is prevented from moving upwards relative to the mandrel 2 by the arrangement, so that the supporting strip 5 loses support for the well wall.

As shown in fig. 1 and 2, the shear pin further comprises an O-shaped sealing ring 16, at least one O-shaped sealing ring 16 is arranged between the second sealing ring platform 8 and the mandrel 2 at an interval from top to bottom, and at least one O-shaped sealing ring 16 is arranged between the first sealing ring platform 7 and the pushing cylinder 3 at an interval from top to bottom corresponding to the position between the internal pressure hole 12 and the shear pin 4. In the use, through setting up O shape sealing washer 16, guarantee that first ring cavity 9 internal pressure is unanimous with dabber 2 external pressure, guarantee that second ring cavity 11 internal pressure is unanimous with dabber 2 internal pressure, avoid first ring cavity 9 and second ring cavity 11 intercommunication, can't cut shear pin 4.

As shown in the attached figures 1 and 2, the device further comprises an upper fixing pin 17, an upper inner ring groove is arranged on the inner side of the lower end of the pushing cylinder 3, the upper ends of the supporting bars 5 are all positioned in the upper inner ring groove, and the outer side of the lower part of the pushing cylinder 3 corresponding to the upper end of each supporting bar 5 is provided with the upper fixing pin 17 which can fixedly install the supporting bars and the supporting bars together. In the use process, the support strip 5 and the pushing cylinder 3 are conveniently and fixedly installed together by using the upper fixing pin 17; the upper end of the support strip 5 is inserted into the upper inner annular groove, so that the upper end of the support strip 5 is positioned between the pushing cylinder 3 and the mandrel 2, and the support strip 5 is more stable in the process of deformation due to the downward thrust of the pushing cylinder 3.

As shown in the attached drawings 1 and 2, the lower fixing pin device further comprises a lower fixing pin 18, a lower inner annular groove is formed in the inner side of the upper end of the lower connector 6, the lower ends of the support bars 5 are located in the lower inner annular groove, and a lower fixing pin 18 capable of fixedly mounting the support bars 5 and the lower fixing pin is arranged on the outer side of the upper portion of the lower connector 6 corresponding to the lower end of each support bar 5. During use, the supporting bar 5 and the lower connector 6 are conveniently and fixedly installed together by using the lower fixing pin 18; insert down the inner ring groove through 5 lower extremes of support bar, make 5 lower extremes of support bar be located between lower clutch 6 and the dabber 2, can not only carry on spacingly to 5 lower extremes of support bar, can also be convenient for support bar 5 receive push away and push away 3 decurrent thrust of a section of thick bamboo and take place more stably when deforming.

As shown in the attached drawings 1 and 2, the inner side of the lower end of the upper joint 1 is fixedly connected with the outer side of the upper end of the mandrel 2 through threads, the outer side of the lower end of the mandrel 2 is fixedly connected with the inner side of the upper end of the lower joint 6 through threads, and the inner side of the lower part of the pushing cylinder 3 is fixedly connected with the locking ring 13 through threads. In the use, through threaded connection's fixed mounting mode, convenient to detach and installation.

Above technical feature constitutes the utility model discloses a best embodiment, it has stronger adaptability and best implementation effect, can increase and decrease unnecessary technical feature according to actual need, satisfies the demand of different situation.

Claims

1. A self-opening hydraulic centralizer is characterized by comprising an upper joint, a mandrel, a pushing cylinder, a shear pin, a supporting strip and a lower joint, wherein the inner side of the lower end of the upper joint is fixedly installed with the outer side of the upper end of the mandrel; a second sealing ring platform is arranged on the inner side of the upper part of the pushing cylinder corresponding to the position above the first sealing ring platform, a first ring cavity is arranged between the pushing cylinder corresponding to the position above the second sealing ring platform and the mandrel, an external pressure gap capable of being communicated with the first ring cavity is arranged between the lower end of the upper joint and the upper end of the pushing cylinder, a second ring cavity is arranged between the pushing cylinder corresponding to the position between the first sealing ring platform and the second sealing ring platform and the mandrel, and at least one internal pressure hole which is communicated with the inside and the outside is arranged on the upper part of the mandrel corresponding to the position of the second ring cavity; a backstop device capable of preventing the pushing cylinder from moving upwards relative to the mandrel is arranged between the inner side of the lower part of the pushing cylinder and the first sealing ring platform; the outer side of the lower end of the mandrel is fixedly provided with a lower joint, at least two supporting strips are distributed on the outer side of the lower part of the mandrel at intervals along the circumference corresponding to the position between the pushing cylinder and the lower joint, the upper ends of the supporting strips are fixedly arranged together with the corresponding position of the pushing cylinder, and the lower ends of the supporting strips are fixedly arranged together with the corresponding position of the lower joint.

2. The self-opening hydraulic centralizer according to claim 1, wherein the backstop device comprises a locking ring, inner backstop teeth, outer backstop teeth and anti-rotation pins, the locking ring is fixedly installed on the inner side of the lower portion of the pushing cylinder, at least one group of inner backstop teeth are arranged on the inner side of the locking ring at intervals from top to bottom, the inner backstop teeth are circular platforms with straight trapezoidal sections, the circular platforms are wide at the top and narrow at the bottom, a plurality of groups of outer backstop teeth matched with the inner backstop teeth are arranged on the outer side of a first sealing circular platform corresponding to the position between the locking ring and the supporting bar at intervals from top to bottom, the outer backstop teeth are circular platforms with straight trapezoidal sections, and the circular platforms are narrow at the top and wide at the bottom; the lock ring is provided with an anti-rotation opening which is communicated up and down, at least one anti-rotation pin is arranged on the outer side of the pushing cylinder corresponding to the position of the anti-rotation opening, and the inner end of each anti-rotation pin is positioned in the anti-rotation opening.

3. The self-opening hydraulic centralizer according to claim 1 or 2, further comprising an O-shaped sealing ring, wherein at least one O-shaped sealing ring is arranged between the second sealing ring platform and the mandrel at intervals up and down, and at least one O-shaped sealing ring is arranged between the first sealing ring platform and the pushing cylinder at intervals up and down corresponding to the position between the internal pressure hole and the shear pin.

4. The self-opening hydraulic centralizer according to claim 1 or 2, further comprising an upper fixing pin, wherein an upper inner ring groove is formed in the inner side of the lower end of the pushing cylinder, the upper ends of the supporting bars are located in the upper inner ring groove, and the outer side of the lower portion of the pushing cylinder corresponding to the upper end of each supporting bar is provided with the upper fixing pin capable of fixedly mounting the supporting bars and the pushing cylinder together.

5. The self-opening hydraulic centralizer according to claim 3, further comprising an upper fixing pin, wherein an upper inner ring groove is formed on the inner side of the lower end of the pushing cylinder, the upper ends of the supporting bars are located in the upper inner ring groove, and an upper fixing pin capable of fixedly mounting the upper fixing pin and the supporting bars is arranged on the outer side of the lower portion of the pushing cylinder corresponding to the upper end of each supporting bar.

6. The self-opening hydraulic centralizer according to claim 1, 2 or 5, further comprising a lower fixing pin, wherein the lower inner ring groove is formed on the inner side of the upper end of the lower joint, the lower ends of the support bars are located in the lower inner ring groove, and the lower fixing pin capable of fixedly mounting the lower fixing pin and the support bars is arranged on the outer side of the upper portion of the lower joint corresponding to the lower end of each support bar.

7. The self-opening hydraulic centralizer according to claim 3, further comprising a lower fixing pin, wherein the lower joint has a lower inner annular groove on the inner side of the upper end, the lower ends of the support bars are located in the lower inner annular groove, and the lower fixing pin is arranged on the outer side of the upper portion of the lower joint corresponding to the lower end of each support bar and can be fixedly mounted on the lower joint.

8. The self-opening hydraulic centralizer according to claim 4, further comprising a lower fixing pin, wherein the lower joint has a lower inner annular groove on the inner side of the upper end, the lower ends of the support bars are located in the lower inner annular groove, and the lower fixing pin is arranged on the outer side of the upper portion of the lower joint corresponding to the lower end of each support bar and can be fixedly mounted on the lower joint.

9. The self-opening hydraulic centralizer according to claim 2, 5, 7 or 8, wherein the inner side of the lower end of the upper joint is fixedly connected with the outer side of the upper end of the mandrel through threads, the outer side of the lower end of the mandrel is fixedly connected with the inner side of the upper end of the lower joint through threads, and the inner side of the lower part of the pushing cylinder is fixedly connected with the locking ring through threads.

10. The self-opening hydraulic centralizer according to claim 6, wherein the inner side of the lower end of the upper joint and the outer side of the upper end of the mandrel are fixedly installed together through threaded connection, the outer side of the lower end of the mandrel and the inner side of the upper end of the lower joint are fixedly installed together through threaded connection, and the inner side of the lower part of the pushing cylinder and the locking ring are fixedly installed together through threaded connection.