CN113803024A - Toe end sliding sleeve device - Google Patents
Toe end sliding sleeve device Download PDFInfo
- Publication number
- CN113803024A CN113803024A CN202010535626.8A CN202010535626A CN113803024A CN 113803024 A CN113803024 A CN 113803024A CN 202010535626 A CN202010535626 A CN 202010535626A CN 113803024 A CN113803024 A CN 113803024A
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- China
- Prior art keywords
- cylinder
- hydraulic cylinder
- toe end
- ring
- cavity
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000007789 sealing Methods 0.000 claims description 18
- 238000010008 shearing Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 5
- 239000002195 soluble material Substances 0.000 abstract description 12
- 239000002002 slurry Substances 0.000 abstract description 6
- 239000004568 cement Substances 0.000 abstract description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 4
- 239000003345 natural gas Substances 0.000 abstract description 2
- 239000003209 petroleum derivative Substances 0.000 abstract description 2
- 230000009466 transformation Effects 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 6
- 239000012530 fluid Substances 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000003466 welding Methods 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
- E21B34/063—Valve or closure with destructible element, e.g. frangible disc
-
- 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
Landscapes
- 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)
- Joining Of Building Structures In Genera (AREA)
Abstract
The invention provides a toe end sliding sleeve device, which belongs to the technical field of petroleum and natural gas industrial well completion and reservoir transformation, and comprises an outer cylinder, wherein a fracturing hole is formed in the outer cylinder, and an annular groove is formed in the inner side of the outer cylinder; the inner cylinder is arranged at the lower part of the annular groove, a cavity is formed between the outer cylinder and the inner cylinder in the annular groove, and an annular opening is formed at the upper part of the annular groove; the hydraulic cylinder is connected to the upper part of the cavity and used for plugging the fracturing hole and the annular opening; and the hydraulic cylinder and the outer cylinder are disconnected and then slide to the lower part of the cavity, so that the fracturing hole is communicated with the annular opening. The invention adopts a built-in design, avoids blockage caused by well cementation cement slurry entering a sliding space, and can realize smooth opening of the sliding sleeve even if the soluble material preset ring is not completely dissolved by a mode of arranging the soluble material preset occupation ring on the upper part of the inner cylinder.
Description
Technical Field
The invention relates to a toe end sliding sleeve device, which is used for the first-stage fracturing operation of a shale gas well and belongs to the technical field of well completion and reservoir transformation in the petroleum and natural gas industry.
Background
After the shale gas well cementing pipe column performs well cementing operation, the conventional ball throwing sliding sleeve cannot be pumped in place due to the fact that a channel is not established between the pipe column and the stratum, and fracturing operation is started. The shale gas first-stage fracturing mode commonly used at the present stage usually adopts coiled tubing perforation operation and toe end sliding sleeve operation. The construction of the coiled tubing perforation operation is mature and has high reliability, but the construction period is long and the cost is expensive; the toe end sliding sleeve operation adopts the tubular column front end to drop the toe end sliding sleeve and relies on the tubular column to suppress and open the sliding sleeve and carry out the first section fracturing construction, establishes fluid passage, has obvious advantages such as low cost, construction cycle are short, but the success rate is lower in the application of present toe end sliding sleeve, and coiled tubing perforation operation still occupies mainstream mode, but along with the improvement of drilling technique, well drilling degree of depth, coiled tubing perforation operation will hardly satisfy the perforation demand of ultra-deep well.
Although the toe end sliding sleeve is not limited by the well depth, the toe end sliding sleeve has a plurality of defects: 1. by adopting the rupture disc type toe end sliding sleeve, well cementation slurry has great influence on the opening of the rupture disc after being solidified in the sliding sleeve, and smooth opening cannot be ensured; 2. The inside slip recess that exists of current differential toe end sliding sleeve, grout remains to solidify during the well cementation, easily causes the unable normal opening of sliding sleeve.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a toe end sliding sleeve device which can block a fracturing hole before fracturing operation, adopts a built-in design to avoid blockage caused by well cementation cement slurry entering a sliding space, and can realize smooth opening of the sliding sleeve even if a soluble material preset ring is not completely dissolved by a mode of arranging the soluble material preset occupation ring on the upper part of an inner cylinder.
In order to achieve the above object, the present invention provides a toe end sliding sleeve device, comprising:
the outer barrel is provided with a fracturing hole, and the inner side of the outer barrel is provided with an annular groove;
the inner cylinder is arranged at the lower part of the annular groove, a cavity is formed between the outer cylinder and the inner cylinder in the annular groove, and an annular opening is formed at the upper part of the annular groove; and
the hydraulic cylinder is connected to the upper part of the cavity and used for plugging the fracturing hole and the annular opening;
and the hydraulic cylinder and the outer cylinder are disconnected and then slide to the lower part of the cavity, so that the fracturing hole is communicated with the annular opening.
The invention has the further improvement that when the hydraulic cylinder is arranged at the upper part of the cavity, the outer cylinder is fixedly connected with the hydraulic cylinder through a shear pin; and after the shearing pin is sheared, the hydraulic cylinder slides to the lower part of the cavity.
The invention is further improved in that the upper end of the inner cylinder is arranged on a position-occupying ring, and the position-occupying ring is matched with the annular opening and is fixed in the annular opening.
The invention is further improved in that the occupation ring is of an annular cylindrical structure made of soluble materials.
The invention is further improved in that the upper end of the outer cylinder is provided with an upper joint, and the lower end of the outer cylinder is provided with a lower joint.
The invention has the further improvement that a first step structure is arranged on the outer side of the lower part of the upper joint, and a first external thread is arranged on the first step structure; a first internal thread is arranged on the inner side of the upper end of the outer barrel; the first external thread is matched with the first internal thread.
The invention has the further improvement that the outer side of the upper part of the lower joint is provided with a second step structure, and a second external thread is arranged on the second step structure; a second internal thread is arranged on the inner side of the lower end of the outer barrel; the second external thread is matched with the second internal thread.
The invention is further improved in that an upper sealing ring is arranged between the upper joint and the outer cylinder, and a lower sealing ring is arranged between the lower joint and the outer cylinder.
The invention is further improved in that sliding sealing devices are arranged between the hydraulic cylinder and the outer cylinder and between the hydraulic cylinder and the inner cylinder.
In another aspect of the present invention, a fracturing method using the toe end sliding sleeve device is provided, which comprises:
installing a position occupying ring on the annular opening, and selecting the thickness of the position occupying ring according to the designed dissolving time; installing the toe end sliding sleeve device on a pipe column and putting the pipe column into the well;
and shearing the shearing pin after the occupation ring is melted, and enabling the hydraulic cylinder to move downwards so as to enable the fracturing hole to be communicated with the annular opening.
Compared with the prior art, the invention has the advantages that:
the toe end sliding sleeve device can block fracturing holes before fracturing operation, adopts a built-in design, avoids blockage caused by well cementation cement slurry entering a sliding space, and can realize smooth opening of the sliding sleeve even if the soluble material preset ring is not completely dissolved in a mode that the upper part of the inner cylinder is provided with the soluble material preset occupation ring.
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 toe end sliding sleeve device according to an embodiment of the present invention.
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 urceolus, 2, the inner tube, 3, the top connection, 4, the lower clutch, 11, fracturing hole, 12, ring channel, 13, cavity, 14, hydraulic cylinder, 15, shearing pin, 21, annular opening, 22, occupy-place ring, 23, sliding seal device, 31, first stair structure, 32, upper seal ring, 41, second stair structure, 42, lower seal ring.
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 a toe end slide sleeve device according to one embodiment of the present invention. According to the toe end sliding sleeve device, the fracturing hole can be plugged before fracturing operation, the built-in design is adopted, the phenomenon that well cementation cement slurry enters a sliding space to cause plugging is avoided, meanwhile, the mode that the soluble material preset occupation ring is arranged on the upper portion of the inner cylinder is adopted, and even if the soluble material preset occupation ring is not completely dissolved, the sliding sleeve can be smoothly opened.
Fig. 1 schematically shows a toe end sliding sleeve device according to an embodiment of the present invention, which includes an outer cylinder provided with a fracturing hole. The fracturing holes are arranged along the radial direction and are positioned on the side surface of the upper part of the outer barrel. An annular groove is formed in the inner side of the outer barrel. An inner cylinder is arranged in the outer cylinder, the inner cylinder is arranged at the lower part of the inner part of the annular groove, and an annular opening is formed at the upper part of the annular groove. In the annular groove, a cavity is formed between the outer cylinder and the inner cylinder, and a hydraulic cylinder is arranged at the upper part in the cavity. And the hydraulic cylinder blocks the fracturing hole and the annular opening. And the hydraulic cylinder and the outer cylinder are disconnected and then slide to the lower part of the cavity, so that the fracturing hole is communicated with the annular opening.
In one embodiment, the hydraulic cylinder is initially located at an upper portion of the cavity, and the outer cylinder and the hydraulic cylinder are fixedly connected through shear pins. The shearing value of the shearing pin is larger than the pressure test value of the whole shaft, so that the shearing pin is not sheared in advance during the pressure test of the whole shaft. After the toe end sliding sleeve device is put into a preset position in the well, the shearing pin is cut off through pressure of pressure test. And when the shearing pin is sheared, the hydraulic cylinder slides to the lower part of the cavity.
In one embodiment, an annular space occupying ring is arranged in the annular opening, and the space occupying ring is made of soluble materials. And (3) before the first-stage fracturing construction, presetting the dissolving time in advance, and determining the thickness of the occupation ring according to the dissolving time. During construction, the occupation ring is gradually dissolved in a period of time, and the annular opening is opened after the occupation ring is dissolved, so that a liquid flow channel leading to the fracturing hole is formed.
In the toe end sliding sleeve device according to the embodiment, the hydraulic cylinder is arranged in the cavity and used for plugging the fracturing hole and the annular opening to form a built-in design, so that well cementation cement slurry is prevented from entering the sliding space to cause plugging, and meanwhile, the soluble material preset occupation ring is arranged on the upper part of the inner cylinder, so that the sliding sleeve can be smoothly opened even if the soluble material preset ring is not completely dissolved.
In one embodiment, the upper end of the outer barrel is provided with an upper joint, and the lower end of the outer barrel is provided with a lower joint. The upper sub connects with the upstream tool and the lower sub connects with the downstream tool. The upper joint and the lower joint are respectively and fixedly connected with the outer cylinder in a threaded connection or welding mode.
In a preferred embodiment, the lower part of the upper joint is provided with a first step structure, the first step structure is positioned at the outer side of the upper joint, and the first step structure is provided with a first external thread. The thickness of urceolus and the thickness phase-match of first step, when the urceolus pegged graft on the first step structure on the top connection, first external screw thread with first internal thread is mutually supported.
In a preferred embodiment, the upper part of the lower joint is provided with a second step structure, the second step structure is positioned at the outer side of the lower joint, and the second step structure is provided with a second external thread. The thickness of the second step structure is matched with that of the outer barrel, and when the outer barrel is inserted into the second step structure on the lower connector, the second external threads are matched with the second internal threads.
In the toe end sliding sleeve device according to the embodiment, the upper joint is provided with the first step structure, and the lower joint is provided with the second step structure. When the upper joint and the lower joint are connected with the outer barrel, the first step structure and the second step structure can play a limiting role. The thicknesses of the first step structure, the second step structure and the edge of the outer barrel are matched, so that the outer surface of the upper joint and the outer surface of the lower joint are smoother after the upper joint and the lower joint are installed. The upper joint and the outer barrel are connected through threads, the lower joint and the outer barrel are also connected through threads, and the threads are connected stably and are convenient to disassemble and assemble.
In one embodiment, an upper sealing ring is arranged between the upper joint and the outer cylinder, and the upper sealing ring is arranged below the first external thread. When the first external thread is connected with the first internal thread, the upper sealing ring is positioned on one side close to the cavity, so that the connecting surface between the upper joint and the outer cylinder can be effectively sealed.
In one embodiment, a lower seal ring is disposed between the lower fitting and the outer barrel, the lower seal ring being disposed below the second external thread. When the second external thread is connected with the second internal thread, the lower sealing ring is positioned on one side close to the cavity, so that the connecting surface between the lower joint and the outer cylinder can be effectively sealed.
In the toe end sliding sleeve device according to the embodiment, the upper sealing ring is arranged between the upper joint and the outer barrel, and the lower sealing ring is arranged between the lower joint and the outer barrel, so that the sealing performance between the upper joint and the outer barrel, the lower joint and the outer barrel can be ensured, and the phenomenon that internal fluid flows out from a connecting seam to influence the fracturing effect is avoided.
In a preferred embodiment, sliding sealing devices are arranged between the hydraulic cylinder and the outer cylinder, and when the hydraulic cylinder and the outer cylinder are connected through the shearing pin nails, the sliding sealing devices are respectively arranged at the upper side and the lower side of the fracturing hole. Preferably, two sets of sliding sealing devices are arranged above the fracturing hole, and two sets of sliding sealing devices are arranged below the fracturing hole. By arranging the sliding sealing device between the hydraulic cylinder and the outer cylinder, the sliding process of the hydraulic cylinder is always kept sealed, and fluid is prevented from flowing out of a contact surface between the hydraulic cylinder and the outer cylinder.
A sliding sealing device is also arranged between the hydraulic cylinder and the inner cylinder, and the sliding sealing device can seal the contact surface of the hydraulic cylinder and the inner cylinder, so that fluid is prevented from entering the cavity through the contact surface of the hydraulic cylinder and the inner cylinder.
According to another aspect of the invention, a fracturing method is also provided, which is realized by the toe end sliding sleeve device of the above embodiment, and comprises the following steps.
Firstly, mounting a position occupying ring on an annular opening, and selecting the thickness of the position occupying ring according to the designed dissolving time; and the toe end sliding sleeve device is arranged on the pipe column and is put into the well.
And then shearing a shearing pin after the occupation ring is melted, and enabling the hydraulic cylinder to move downwards so as to enable the fracturing hole to be communicated with the annular opening.
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. A toe sleeve assembly, comprising:
the outer barrel is provided with a fracturing hole, and the inner side of the outer barrel is provided with an annular groove;
the inner cylinder is arranged at the lower part of the annular groove, a cavity is formed between the outer cylinder and the inner cylinder in the annular groove, and an annular opening is formed at the upper part of the annular groove; and
the hydraulic cylinder is connected to the upper part of the cavity and used for plugging the fracturing hole and the annular opening;
and the hydraulic cylinder and the outer cylinder are disconnected and then slide to the lower part of the cavity, so that the fracturing hole is communicated with the annular opening.
2. The toe end sliding sleeve device according to claim 1, wherein when the hydraulic cylinder is arranged at the upper part of the cavity, the outer cylinder is fixedly connected with the hydraulic cylinder through shear pins; and after the shearing pin is sheared, the hydraulic cylinder slides to the lower part of the cavity.
3. The toe end slide bushing assembly of claim 2 wherein said inner barrel is disposed at an upper end thereof in a capture ring which mates with and is secured within said annular opening.
4. The toe end slide bushing apparatus of claim 2 wherein said capture ring is an annular cylindrical structure of a dissolvable material.
5. The toe end slide bushing apparatus of any one of claims 1 to 4 wherein an upper joint is provided at an upper end of the outer barrel and a lower joint is provided at a lower end of the outer barrel.
6. The toe end slide bushing apparatus of claim 5, wherein a first step structure is provided on an outer side of a lower portion of said upper joint, said first step structure being provided with a first external thread; a first internal thread is arranged on the inner side of the upper end of the outer barrel; the first external thread is matched with the first internal thread.
7. The toe end slide bushing apparatus of claim 6, wherein the outer side of the upper portion of the lower joint is provided with a second step structure, and the second step structure is provided with a second outer thread; a second internal thread is arranged on the inner side of the lower end of the outer barrel; the second external thread is matched with the second internal thread.
8. The toe end slide bushing of any one of claims 5 to 7 wherein an upper seal ring is disposed between the upper fitting and the outer barrel and a lower seal ring is disposed between the lower fitting and the outer barrel.
9. The toe end sliding sleeve device according to claim 8, wherein sliding sealing means are provided between the hydraulic cylinder and the outer cylinder and between the hydraulic cylinder and the inner cylinder.
10. A fracturing method using the toe sleeve device according to any one of claims 1 to 9, comprising:
installing a position occupying ring on the annular opening, and selecting the thickness of the position occupying ring according to the designed dissolving time; installing the toe end sliding sleeve device on a pipe column and putting the pipe column into the well;
and shearing the shearing pin after the occupation ring is melted, and enabling the hydraulic cylinder to move downwards so as to enable the fracturing hole to be communicated with the annular opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010535626.8A CN113803024B (en) | 2020-06-12 | 2020-06-12 | Toe end sliding sleeve device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010535626.8A CN113803024B (en) | 2020-06-12 | 2020-06-12 | Toe end sliding sleeve device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113803024A true CN113803024A (en) | 2021-12-17 |
| CN113803024B CN113803024B (en) | 2024-02-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010535626.8A Active CN113803024B (en) | 2020-06-12 | 2020-06-12 | Toe end sliding sleeve device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113803024B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105064973A (en) * | 2015-08-28 | 2015-11-18 | 中国石油化工股份有限公司 | Blasting type fracturing control valve |
| US20150369007A1 (en) * | 2013-03-07 | 2015-12-24 | Geodynamics, Inc. | Hydraulic Delay Toe Valve System and Method |
| CN109339757A (en) * | 2018-08-21 | 2019-02-15 | 中国石油天然气股份有限公司 | Time-delay sliding sleeve |
| CN110513095A (en) * | 2019-09-23 | 2019-11-29 | 中国石油集团川庆钻探工程有限公司 | Oil and gas well fracturing transformation process adopting controllable delay opening toe end sliding sleeve |
| CN110541687A (en) * | 2019-09-23 | 2019-12-06 | 中国石油集团川庆钻探工程有限公司 | Toe end sliding sleeve capable of controlled delay opening |
| CN111021990A (en) * | 2019-12-18 | 2020-04-17 | 中国石油天然气股份有限公司 | Soluble toe end sliding sleeve for well cementation and completion and using method thereof |
| CN210660028U (en) * | 2019-09-23 | 2020-06-02 | 中国石油集团川庆钻探工程有限公司 | Toe end sliding sleeve capable of being controlled to be opened in delayed mode |
-
2020
- 2020-06-12 CN CN202010535626.8A patent/CN113803024B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150369007A1 (en) * | 2013-03-07 | 2015-12-24 | Geodynamics, Inc. | Hydraulic Delay Toe Valve System and Method |
| CN105064973A (en) * | 2015-08-28 | 2015-11-18 | 中国石油化工股份有限公司 | Blasting type fracturing control valve |
| CN109339757A (en) * | 2018-08-21 | 2019-02-15 | 中国石油天然气股份有限公司 | Time-delay sliding sleeve |
| CN110513095A (en) * | 2019-09-23 | 2019-11-29 | 中国石油集团川庆钻探工程有限公司 | Oil and gas well fracturing transformation process adopting controllable delay opening toe end sliding sleeve |
| CN110541687A (en) * | 2019-09-23 | 2019-12-06 | 中国石油集团川庆钻探工程有限公司 | Toe end sliding sleeve capable of controlled delay opening |
| CN210660028U (en) * | 2019-09-23 | 2020-06-02 | 中国石油集团川庆钻探工程有限公司 | Toe end sliding sleeve capable of being controlled to be opened in delayed mode |
| CN111021990A (en) * | 2019-12-18 | 2020-04-17 | 中国石油天然气股份有限公司 | Soluble toe end sliding sleeve for well cementation and completion and using method thereof |
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| Publication number | Publication date |
|---|---|
| CN113803024B (en) | 2024-02-27 |
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