CN112211592A - Switchable well cementation sliding sleeve - Google Patents
Switchable well cementation sliding sleeve Download PDFInfo
- Publication number
- CN112211592A CN112211592A CN201910630566.5A CN201910630566A CN112211592A CN 112211592 A CN112211592 A CN 112211592A CN 201910630566 A CN201910630566 A CN 201910630566A CN 112211592 A CN112211592 A CN 112211592A
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- Prior art keywords
- sleeve
- fracturing
- switch
- groove
- inner sleeve
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- 230000007246 mechanism Effects 0.000 claims abstract description 13
- 239000012530 fluid Substances 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 10
- 230000000903 blocking effect Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 7
- 239000003208 petroleum Substances 0.000 abstract description 2
- 230000006872 improvement Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000004568 cement Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005488 sandblasting Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002195 soluble material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Switches That Are Operated By Magnetic Or Electric Fields (AREA)
Abstract
The invention provides a switchable well cementation sliding sleeve, which belongs to the field of downhole tools for petroleum well cementation and comprises a shell, wherein a fracturing groove is formed in the side wall of the shell; a soluble inner sleeve is arranged in the outer shell and seals the fracturing groove; and a switch mechanism disposed within the housing, the switch mechanism configured to close the fracturing tank after fracturing is complete; the soluble inner sleeve is dissolved within a certain time after being put into a preset position, so that the fracturing groove is leaked out to perform fracturing operation; and closing the fracturing groove through a switch mechanism after the fracturing operation is finished. The invention is provided with a soluble inner sleeve, can be directly used for fracturing construction, and can be mechanically switched at the later stage.
Description
Technical Field
The invention relates to a switchable well cementation sliding sleeve, and belongs to the field of downhole tools for petroleum well cementation and completion.
Background
With the continuous and deep exploration and development of oil and gas reservoirs, the implementation of staged fracturing reformation of horizontal wells becomes a necessary means for the effective development of unconventional oil and gas reservoirs such as shale gas. At present, the horizontal well staged fracturing technology of shale gas wells mainly comprises a bridge plug perforation continuous operation process and a dragging pipe column sand blasting perforation fracturing process, wherein a target layer is divided into a plurality of sections, and fracturing construction operation is performed after perforation treatment is performed. However, perforation operation often causes casing damage due to underground uncontrollable factors, the casing strength is reduced, the difficulty in running the bridge plug and the fracturing string is increased, the construction period of the whole fracturing construction operation is long, and the operation efficiency is low. The well cementation sliding sleeve staged fracturing process is popularized and applied due to short period and high efficiency, can replace a bridge plug perforating continuous operation process and a dragging pipe column sand blasting perforating fracturing process of a conventional bridge plug, adopts a differential pressure type well cementation sliding sleeve in the first-stage fracturing of the conventional well cementation sliding sleeve, realizes the opening of the differential pressure sliding sleeve through the pressure build-up in a pipe, and then carries out fracturing construction operation. But the differential pressure type well cementation sliding sleeve that adopts at present has certain technical problem: firstly, after well cementation, the sliding sleeve can not be normally opened due to the influence of a cement sheath; secondly, the sliding sleeve can not be closed after being opened, and if the water outlet of the layer section is serious, the treatment can not be carried out.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a switchable well cementation sliding sleeve which is provided with a soluble inner sleeve, can be directly used for fracturing construction and can be mechanically switched at a later stage.
In order to achieve the above object, the present invention provides a switchable well cementation sliding sleeve, comprising:
the side wall of the shell is provided with a fracturing groove;
a soluble inner sleeve is arranged in the outer shell and seals the fracturing groove; and
a switch mechanism disposed within the housing, the switch mechanism configured to close the fracturing tank after fracturing is complete;
the soluble inner sleeve is dissolved within a certain time after being put into a preset position, so that the fracturing groove is leaked out to perform fracturing operation; and closing the fracturing groove through a switch mechanism after the fracturing operation is finished.
A further improvement of the present invention is that the soluble inner sleeve comprises a cylindrical inner sleeve body that is soluble in completion fluid; the outer surface of the inner sleeve main body is provided with a brittle outer skin;
wherein the inner sleeve body is prevented from contacting the completion fluid when the brittle outer skin is intact, and is capable of fracturing under a certain pressure to contact the inner sleeve body with the completion fluid.
The invention has the further improvement that the switch mechanism comprises a switch sleeve sleeved inside the shell and a switch tool matched with the switch sleeve;
wherein the switch sleeve is configured to be movable within the housing by operation of a switch tool.
The invention is further improved in that when the soluble inner sleeve is complete, the switch sleeve is clamped at a first position below the soluble sleeve in the outer shell; after the soluble inner sleeve is dissolved and the fracturing operation is completed, the switch sleeve moves under the operation of the switch tool and is clamped to a second position blocking the fracturing groove.
The invention has the further improvement that the outer wall of the switch sleeve is provided with a clamp spring, and the inner wall of the shell is provided with a first clamping groove and a second clamping groove; when the switch sleeve is located at the first position, the clamp spring is clamped in the first clamping groove; when the switch sleeve is located at the second position, the clamp spring is clamped in the second clamping groove.
The invention has the further improvement that the inner wall of the switch sleeve is provided with an annular groove, and the outer wall of the switch tool is provided with a telescopic elastic block; when the switch tool is put into the position of the switch sleeve, the elastic block is extended to be clamped in the annular groove, so that the switch tool is connected with the switch sleeve.
The invention is further improved in that a hydraulic cavity is arranged in the switch tool, pressure is increased in the hydraulic cavity to push the elastic block to extend, and the elastic block contracts after the pressure is reduced.
The improved structure of the invention is characterized in that the side surfaces of the first clamping groove and the second clamping groove are inclined edges of 30-80 degrees.
The invention has the further improvement that two groups of sealing rings are arranged on the outer wall of the soluble inner sleeve, and the two groups of sealing rings are respectively arranged on two sides of the fracturing groove.
A further development of the invention is that the upper part of the housing is connected by means of a screw thread with an upper joint.
Compared with the prior art, the invention has the advantages that:
the switchable well cementation sliding sleeve is provided with the soluble inner sleeve, the soluble inner sleeve can be dissolved to realize the hole opening of a pipe column after high pressure is suppressed, the fracturing operation is directly carried out, the switchable well cementation sliding sleeve has a switching function, cement plug or bridge plug plugging is not required to be driven, and the operation time and the cost are saved.
Drawings
Preferred embodiments of the present invention will be described in detail below with reference to the attached drawing figures, wherein:
FIG. 1 is a schematic structural view of a switchable well cementation sliding sleeve according to an embodiment of the present invention, showing an initial state;
FIG. 2 is a schematic structural view of the switchable well cementation sliding sleeve according to an embodiment of the present invention, showing a state after the soluble inner sleeve is dissolved;
fig. 3 is a schematic structural diagram of the switchable well cementation sliding sleeve according to an embodiment of the present invention, showing a state that the switching sleeve closes the fracturing groove.
In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
The meaning of the reference symbols in the drawings is as follows: 1. the device comprises a shell, 2, a soluble inner sleeve, 3, a switch sleeve, 11, a fracturing groove, 12, a first clamping groove, 13, a second clamping groove, 14, an upper joint, 21, a sealing ring, 31, a clamp spring, 32 and an annular groove.
Detailed Description
In order to make the technical solutions and advantages of the present invention more apparent, exemplary embodiments of the present invention are described in further detail below with reference to the accompanying drawings. It is clear that the described embodiments are only a part of the embodiments of the invention, and not an exhaustive list of all embodiments. And the embodiments and features of the embodiments may be combined with each other without conflict.
Figure 1 schematically illustrates an openable and closable cementing slip sleeve according to one embodiment of the present invention. According to the switchable well cementation sliding sleeve, the switchable well cementation sliding sleeve is provided with the soluble inner sleeve 2, the soluble inner sleeve 2 can be dissolved to realize hole opening of a pipe column after high pressure is suppressed, fracturing operation is directly carried out, the switchable well cementation sliding sleeve has a switching function, cement plug or bridge plug plugging is not needed, and operation time and cost are saved.
Figure 1 schematically shows a switchable cementing sleeve according to one embodiment of the present invention comprising a housing 1. The shell 1 is of a cylindrical structure, and a plurality of fracturing grooves 11 are formed in the side wall of the shell 1. The fracturing groove 11 is circumferentially arranged on the side wall of the shell 1 for one circle, and the fracturing groove 11 is in a long strip shape, and the length direction of the fracturing groove is the same as the length direction of the shell 1. The switchable well cementation sliding sleeve of the embodiment further comprises a soluble inner sleeve 2, wherein the soluble inner sleeve 2 is arranged inside the outer shell 1 and seals the fracturing groove 11. The soluble inner sleeve 2 can be dissolved within a certain time after being put into a predetermined position, and the fracturing groove 11 is exposed, so that the fracturing operation can be performed through the fracturing groove 11. The switchable well cementation sliding sleeve of the embodiment further comprises a soluble inner sleeve 2 and a switch structure, wherein the switch structure is configured to close the fracturing groove 11 after fracturing is completed.
When the switchable well cementation sliding sleeve according to the embodiment is used, the casing 1 is firstly connected in series with other tools and is put into the well along with the other tools. After reaching a preset position, the soluble inner sleeve 2 is contacted with and dissolved in the well completion fluid, so that the fracturing groove 11 leaks out, fracturing construction operation is carried out through the fracturing groove 11, and the sliding sleeves at other layers can adopt a conventional ball-throwing well cementation mode. And when the fracturing operation is finished, the fracturing groove 11 is closed through the switch mechanism. Through the scheme of this embodiment, dissolve soluble endotheca 2 and realize the tubular column trompil, directly carry out fracturing operation, and possess the switch function, need not beat cement plug or bridging plug shutoff, save activity duration and cost.
In one embodiment, as shown in fig. 1, the soluble inner sleeve 2 comprises a cylindrical inner sleeve body having an outer diameter slightly smaller than the inner diameter of the outer shell 1 so that it is sealed inside the outer shell 1. The inner sleeve body is made of soluble material and can be dissolved in the well completion fluid. In this embodiment, the soluble inner sleeve 2 further comprises a brittle outer skin coated on the outer surface of the inner sleeve body. Wherein the inner sleeve body is prevented from contacting the completion fluid when the brittle outer skin is intact, and is capable of fracturing under a certain pressure to contact the inner sleeve body with the completion fluid.
In the switchable well cementation sliding sleeve according to the embodiment, the brittle outer skin can prevent the inner sleeve main body from dissolving, so that the soluble inner sleeve 2 is prevented from dissolving in advance, and the dissolution of the soluble inner sleeve 2 is controllable. When the well cementing device is used, the sliding sleeve is firstly put into a preset position, then well cementing operation is carried out, and completion fluid is adopted for replacement and waiting for setting. And then performing pressure test in the pipe as required, when the pressure reaches a certain value (for example, 40-50 MPa), the brittle outer skin on the surface of the soluble inner sleeve 2 is broken, the inner sleeve body starts to dissolve by contacting with the well completion fluid, the dissolving time is controlled within 1-3 days (the dissolving time can be adjusted by the thickness of the inner sleeve body according to the required time), and the soluble inner sleeve 2 is gradually and completely dissolved.
In one embodiment, the switch mechanism comprises a switch sleeve 3, and the switch sleeve 3 is arranged below the soluble inner sleeve 2 (in the embodiment, the lower part refers to the part far away from the wellhead, the right part in fig. 1; the upper part refers to the part close to the wellhead, and the left part in fig. 1; in other embodiments, the directions of the upper part and the lower part are the same as those of the embodiment). The switch mechanism further comprises a switch tool which can be lowered to the position of the switch sleeve 3 and can be connected with the switch sleeve 3, and the switch sleeve 3 can be moved by pulling the switch tool at a wellhead.
In the switchable cementing sleeve according to the present embodiment, as shown in fig. 1, the switch sleeve 3 is disposed below the soluble inner sleeve 2 before the soluble inner sleeve 2 is not dissolved, and the switch sleeve 3 cannot move because the soluble inner sleeve 2 is stuck on the switch sleeve 3. After the soluble inner sleeve 2 is dissolved (as shown in fig. 2), the fracturing groove 11 leaks out, and after fracturing is completed, the switch sleeve 3 can be pulled to the position of the fracturing groove 11 by a switch tool to close the fracturing groove 11 (as shown in fig. 3).
In one embodiment, the switch housing 3 has two states within the housing 1 corresponding to two positions within the housing 1, including a first position and a second position. The first position of the switch sleeve 3 is the position below the switch sleeve 3 before the soluble inner sleeve 2 is dissolved; the second position is a position in which the switch case 3 is moved to block the fracturing groove 11 by operating the switch tool.
In a preferred embodiment, a snap spring 31 is arranged on the outer wall of the switch sleeve 3, and the snap spring 31 has certain elasticity. The inner wall of the shell 1 is provided with two clamping grooves matched with the clamping springs 31, and the two clamping grooves comprise a first clamping groove 12 located at the lower part and a second clamping groove 13 located at the upper part. When the switch sleeve 3 is located at the first position, the clamp spring 31 is clamped in the first clamping groove 12; when the switch sleeve 3 is located at the second position, the clamp spring 31 is clamped in the second clamping groove 13.
The first card slot 12 and the second card slot 13 can keep the switch sleeve 3 fixed and not slide freely in the first position and the second position. The snap spring 31 protects the switch sleeve 3 and prevents the switch sleeve 3 from moving in advance, thereby avoiding the switch from being opened and closed in advance.
In one embodiment, the switch housing 3 is provided with an annular groove 32 on the inner wall, and the annular groove 32 is formed along the inner wall of the switch housing 3 in a circle. The outer wall of the switch tool is provided with a telescopic elastic block, and the appearance of the spring block is matched with the annular groove 32. When the switch tool is lowered into the position of the switch housing 3, the elastic block is extended to be clamped in the annular groove 32, so that the switch tool is connected with the switch housing 3.
In a preferred embodiment, a hydraulic cavity is arranged in the switch tool, and pressure can be filled in the hydraulic cavity so as to push the elastic block to extend, and the elastic block contracts after the pressure is reduced. When the switch tool is put into the position of the switch sleeve 3, pressure is filled into the switch tool to extend the elastic block, the end part of the elastic block is clamped in the annular groove 32 after the elastic block is extended, so that the elastic block is connected with the switch sleeve 3, and when the switch tool is lifted, the switch tool pulls the switch sleeve 3 to move upwards, so that the fracturing groove 11 is closed.
In one embodiment, the side surfaces of the first card slot 12 and the second card slot 13 are oblique edges, and the angle of the oblique edges is 30-80 degrees, and preferably 60 degrees. The side surfaces of the first card slot 12 and the second card slot 13 are provided with beveled edges which facilitate the ejection of the snap spring 31 when the switch tool is pulled. The clamping spring 31 cannot be conveniently popped up due to the overlarge bevel edge, and the unstable clamping spring 31 is easily caused due to the overlarge bevel edge.
In one embodiment, two sets of sealing rings 21 are disposed on the outer wall of the soluble inner sleeve 2, and the two sets of sealing rings 21 are disposed on two sides of the fracturing tank 11 respectively. The sealing effect of the soluble inner sleeve 2 is ensured by the arrangement of the sealing ring 21.
In a preferred embodiment, the upper part of the housing 1 is provided with an upper connector 14 for connecting other components. The upper portion of shell 1 is provided with the internal thread, and the lower part of top connection 14 is provided with the external screw thread, links to each other through the screw thread between shell 1 and the top connection 14, connects firmly and the dismouting of being convenient for. The housing 1 and the upper joint 14 are also prevented from rotating by the set screws and are sealed by a sealing ring 21. In this embodiment, the lower end surface of the upper joint 14 further forms a limiting step, the upper end of the soluble inner sleeve 2 is clamped at the position of the step, and when the switch sleeve 3 moves to the second position, the upper end of the soluble inner sleeve also contacts with the step.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, the appended claims are intended to be construed to include preferred embodiments and all such changes and/or modifications as fall within the scope of the invention, and all such changes and/or modifications as are made to the embodiments of the present invention are intended to be covered by the scope of the invention.
Claims (10)
1. The utility model provides a but switch well cementation sliding sleeve which characterized in that includes:
the device comprises a shell (1), wherein a fracturing groove (11) is formed in the side wall of the shell (1);
a soluble inner sleeve (2) is arranged in the outer shell (1), and the soluble inner sleeve (2) seals the fracturing groove (11); and
a switch mechanism disposed within the housing (1) configured to close the fracturing tank (11) after fracturing is complete;
wherein the soluble inner sleeve (2) is dissolved within a certain time after being put into a preset position, so that the fracturing groove (11) leaks out to perform fracturing operation; and when the fracturing operation is finished, the fracturing groove (11) is closed through a switch mechanism.
2. The switchable cementing sleeve of claim 2, wherein the soluble inner sleeve (2) comprises a cylindrical inner sleeve body that is soluble in completion fluid; the outer surface of the inner sleeve main body is provided with a brittle outer skin;
wherein the inner sleeve body is prevented from contacting the completion fluid when the brittle outer skin is intact, and is capable of fracturing under a certain pressure to contact the inner sleeve body with the completion fluid.
3. The switchable cementing sliding sleeve according to claim 1 or 2, wherein the switching mechanism comprises a switching sleeve (3) sleeved inside the casing (1), and a switching tool engaged with the switching sleeve;
wherein the switch sleeve (3) is configured to be movable within the housing (1) by operation of a switch tool.
4. The switchable cementing sleeve according to claim 3, characterized in that the switch sleeve (3) is snapped in a first position inside the housing (1) below the soluble sleeve when the soluble inner sleeve (2) is intact; after the soluble inner sleeve (2) is dissolved and the fracturing operation is completed, the switch sleeve (3) moves and is clamped to a second position blocking the fracturing groove (11) under the operation of the switch tool.
5. The switchable well cementation sliding sleeve according to claim 4, wherein a snap spring (31) is arranged on the outer wall of the switch sleeve (3), and a first clamping groove (12) and a second clamping groove (13) are arranged on the inner wall of the housing (1); when the switch sleeve (3) is located at the first position, the clamp spring (31) is clamped in the first clamping groove (12); when the switch sleeve (3) is located at the second position, the clamp spring (31) is clamped in the second clamp groove (13).
6. The switchable cementing sliding sleeve according to claim 5, wherein an annular groove (32) is arranged on the inner wall of the switch sleeve (3), and a telescopic elastic block is arranged on the outer wall of the switch tool; when the switch tool is lowered to the position of the switch sleeve (3), the elastic block is extended to be clamped in the annular groove (32), so that the switch tool is connected with the switch sleeve (3).
7. The switchable well cementation sliding sleeve according to claim 6, wherein a hydraulic chamber is provided in the switching tool, and pressure is increased in the hydraulic chamber to push the elastic block to extend, and the elastic block contracts after the pressure is reduced.
8. The switchable well cementation sliding sleeve according to any one of claims 5 to 7, wherein the side surfaces of the first clamping groove (12) and the second clamping groove (13) are inclined edges of 30-80 degrees.
9. The switchable cementing sleeve according to any one of claims 2 to 8, wherein two sets of sealing rings (21) are arranged on the outer wall of the soluble inner sleeve (2), and the two sets of sealing rings (21) are respectively arranged on two sides of the fracturing groove (11).
10. Switchable cementing skid according to claim 9, characterized in that the upper part of the housing (1) is connected with an upper joint (14) by means of a screw thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910630566.5A CN112211592A (en) | 2019-07-12 | 2019-07-12 | Switchable well cementation sliding sleeve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910630566.5A CN112211592A (en) | 2019-07-12 | 2019-07-12 | Switchable well cementation sliding sleeve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112211592A true CN112211592A (en) | 2021-01-12 |
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ID=74047831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910630566.5A Pending CN112211592A (en) | 2019-07-12 | 2019-07-12 | Switchable well cementation sliding sleeve |
Country Status (1)
| Country | Link |
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| CN (1) | CN112211592A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113605859A (en) * | 2021-09-15 | 2021-11-05 | 四川沃德沃富石油科技有限公司 | Well cementation sliding sleeve system, using method, well cementation sliding sleeve assembling method and maintenance method |
| CN115247546A (en) * | 2021-04-28 | 2022-10-28 | 中石化石油工程技术服务有限公司 | Toe end well cementation fracturing sliding sleeve |
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| CN204113210U (en) * | 2014-09-24 | 2015-01-21 | 中国石油天然气股份有限公司 | A kind of full well section is without bridging plug Semi-cementing tool |
| CN105569606A (en) * | 2014-10-11 | 2016-05-11 | 中国石油化工股份有限公司 | Switchable pressure differential sliding sleeve |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115247546A (en) * | 2021-04-28 | 2022-10-28 | 中石化石油工程技术服务有限公司 | Toe end well cementation fracturing sliding sleeve |
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| CN113605859A (en) * | 2021-09-15 | 2021-11-05 | 四川沃德沃富石油科技有限公司 | Well cementation sliding sleeve system, using method, well cementation sliding sleeve assembling method and maintenance method |
| CN113605859B (en) * | 2021-09-15 | 2023-02-03 | 四川沃德沃富石油科技有限公司 | Well cementation sliding sleeve system, using method, well cementation sliding sleeve assembling method and maintenance method |
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Application publication date: 20210112 |
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