CN109339757B - Time-delay sliding sleeve - Google Patents
Time-delay sliding sleeve Download PDFInfo
- Publication number
- CN109339757B CN109339757B CN201810957114.3A CN201810957114A CN109339757B CN 109339757 B CN109339757 B CN 109339757B CN 201810957114 A CN201810957114 A CN 201810957114A CN 109339757 B CN109339757 B CN 109339757B
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- Prior art keywords
- inner cylinder
- time
- sliding sleeve
- delay
- cylinder
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
- E21B34/085—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained with time-delay systems, e.g. hydraulic impedance mechanisms
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/06—Sleeve valves
Abstract
The invention discloses a time-delay sliding sleeve, and belongs to the field of oilfield development. This time delay sliding sleeve includes: the left joint, the outer cylinder and the right joint are connected in sequence from left to right, and the inner cylinder, the separating ring, the time delay mechanism and the starting ring are connected in sequence. The cylinder diameter of the left end of the inner cylinder is larger than that of the right end of the inner cylinder, and the inner cylinder is slidably sleeved in the outer cylinder. The inner cylinder is connected with the starting ring, a sealed annular space is arranged between the inner cylinder and the outer cylinder, and the starting ring is used for being separated from the inner cylinder after the pressure reaches a preset value. The lateral wall of the outer cylinder is provided with a fracturing hole positioned on the left side of the annular space. And hydraulic oil is arranged in the right chamber, and the delay mechanism is used for controlling the flow of the hydraulic oil and the real-time on-off of the right chamber and the left chamber. The time-delay sliding sleeve provided by the invention can meet the construction requirement of establishing a first section of fracturing channel, is simple to operate, short in operation period and low in cost, and can precisely control the communication time of the inner cavity of the inner barrel and a fracturing hole to realize the pressure test of the whole well barrel.
Description
Technical Field
The invention relates to the field of unconventional oil and gas field development, in particular to a time-delay sliding sleeve.
Background
In unconventional reservoir development, staged fracturing operations are typically performed to improve the flow environment of oil in the subsurface and increase well production. Before fracturing operation, it is very important to establish a first section of fracturing channel in an oil and gas well.
Prior to performing a fracturing operation, a first section of a fracturing channel is established in a hydrocarbon well by perforating a fracturing string through a coiled tubing or conventionally actuating a sliding sleeve.
The inventor finds that the prior art has at least the following problems:
if fracturing operation needs to be carried out in a deeper horizontal well, then the first section of fracturing channel is established in the oil and gas well by perforating the fracturing string through the coiled tubing, so that the period is long, the cost is high, and the fracturing channel is limited by a well track and the operation length of the coiled tubing.
Disclosure of Invention
The embodiment of the invention provides a time-delay sliding sleeve, which can solve the technical problem. The specific technical scheme is as follows:
the embodiment of the invention provides a time-delay sliding sleeve, which comprises: the device comprises a left joint, an outer cylinder, a right joint, an inner cylinder, a separating ring, a time delay mechanism and a starting ring which are sequentially connected from left to right;
the cylinder diameter of the left end of the inner cylinder is larger than that of the right end of the inner cylinder, and the inner cylinder is slidably sleeved in the outer cylinder;
the inner cylinder is connected with the starting ring, a sealed annular space is arranged between the inner cylinder and the outer cylinder, and the starting ring is used for being separated from the inner cylinder after the pressure reaches a preset value;
a fracturing hole positioned on the left side of the annular space is formed in the side wall of the outer barrel;
the separating ring is arranged in the annular space and is used for separating the annular space into a left chamber and a right chamber, and a delay channel for accommodating the delay mechanism is arranged on the separating ring;
and hydraulic oil is arranged in the right chamber, and the delay mechanism is used for controlling the flow of the hydraulic oil and the real-time on-off of the right chamber and the left chamber.
In one possible design, the time delay mechanism includes: and the pressure limiting valve and the flow control valve are sequentially arranged in the delay channel from left to right.
In one possible design, the fracturing holes are plugged by a dissolvable plug.
In one possible design, the outer barrel and the right joint are connected by a double male nipple.
In a possible design, first sealing rings are arranged between the outer cylinder and the left joint, between the inner cylinder and between the outer cylinder and the double male short sections.
In one possible design, a second sealing ring is arranged between the double male short section and the inner cylinder.
In one possible design, a third sealing ring is arranged between the double male nipple and the right joint.
In one possible design, the left joint is screwed to the outer cylinder.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
according to the time-delay sliding sleeve provided by the embodiment of the invention, the inner cylinder is arranged, and the cylinder diameter at the left end of the inner cylinder is larger than that at the right end of the inner cylinder, so that the pressure on the right part of the inner cylinder is larger and the inner cylinder can move rightwards when the wellhead is pressurized. Through setting up the start ring to make inner tube and start ring be connected, guaranteed that inner tube and start ring are connected the fastening, and both can separate smoothly after receiving certain pressure. By arranging the outer cylinder and the delay mechanism, arranging a sealed annular space between the inner cylinder and the outer cylinder and arranging the separating ring in the middle of the inner cylinder, the annular space can be separated into a left chamber and a right chamber, so that hydraulic oil in the right chamber can flow into the left chamber through the delay mechanism contained in the delay passage of the separating ring, the flow of the hydraulic oil can be controlled while the inner cylinder is ensured to move further to the right, and the aim of precise flow limitation is fulfilled; when the inner cylinder needs to be suspended to move, the real-time on-off of the right chamber and the left chamber can be realized only by reducing the pressure in the inner cylinder to the opening value of the pressure limiting valve. Through set up the fracturing hole that is located the left side of annular space on the lateral wall of urceolus, guaranteed when the inner tube moves the default distance right after, the inner chamber of inner tube can communicate with this fracturing hole, establish fracturing passageway smoothly. Therefore, the time-delay sliding sleeve provided by the embodiment of the invention can meet the construction requirement of establishing the first section of fracturing channel, is simple to operate, short in operation period and low in cost, can precisely control the communication time between the inner cavity of the inner cylinder and the fracturing hole, realizes the pressure test of the shaft, and only needs to reduce the pressure in the inner cylinder to the opening value of the pressure limiting valve when the pressure test of the shaft is required to be suspended due to other factors.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic sectional view of a time-delay sliding sleeve according to an embodiment of the present invention;
FIG. 2 is a first partial schematic view of a time-delay sliding sleeve provided by an embodiment of the invention;
FIG. 3 is a second partial schematic view of the time-delay sliding sleeve provided by the embodiment of the invention;
fig. 4 is a third partial schematic view of the time-delay sliding sleeve provided by the embodiment of the invention.
The reference numerals denote:
1, a left joint is arranged at the left part,
2, an outer cylinder is arranged on the outer cylinder,
201 the holes are fractured by the pressure, and,
3 the right joint is connected with the right joint,
4, an inner cylinder is arranged in the inner cylinder,
5, separating the ring, wherein the separating ring is provided with a plurality of separating rings,
6, a time-delay mechanism is arranged,
601 a pressure-limiting valve is arranged on the valve body,
602 the flow control valve is set in the valve body,
7, starting the ring, and starting the ring,
8, a left chamber and a right chamber,
9 the right chamber of the chamber, 9,
10 double male short joints.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
It should be noted that the following "left" and "right" directions refer to directions of the delay sliding sleeve provided in the embodiment of the present invention when the delay sliding sleeve operates in a horizontal well, and at this time, the delay sliding sleeve is located at a toe end (i.e., a front end) of the horizontal well. When the time-delay sliding sleeve is applied to a vertical well, the following directions of left and right can be understood as the directions of up and down.
The embodiment of the invention provides a time-delay sliding sleeve, as shown in the attached drawings 1, 2 and 3, the time-delay sliding sleeve comprises: the device comprises a left joint 1, an outer cylinder 2, a right joint 3, an inner cylinder 4, a separating ring 5, a time delay mechanism 6 and a starting ring 7 which are connected in sequence from left to right. Wherein, the cylinder diameter of the left end of the inner cylinder 4 is larger than that of the right end, and the inner cylinder 2 is sleeved with the inner cylinder in a sliding way. The inner cylinder 4 is connected with the starting ring 7, a sealed annular space is arranged between the inner cylinder 4 and the outer cylinder 2, and the starting ring 7 is used for being separated from the inner cylinder 4 after the pressure reaches a preset value. The sidewall of the outer cylinder 2 is provided with a fracturing hole 201 on the left side of the annular space. The separating ring 5 is arranged in the annular space and is used for separating the annular space into a left chamber 8 and a right chamber 9, and a delay channel for accommodating the delay mechanism 6 is arranged on the separating ring 5. Hydraulic oil is arranged in the right chamber 9, and the delay mechanism 6 is used for controlling the flow of the hydraulic oil and the real-time on-off of the right chamber 9 and the left chamber 8.
When fracturing operation is required to be carried out in a deeper horizontal well, the left joint 1 and the right joint 3 are respectively connected with the casing and are put into a shaft along with the casing, and well cementation operation is completed. And then, performing pressure test operation, pressing the inner sleeve from the wellhead, wherein the right part of the inner sleeve 4 is stressed greatly due to the fact that the sleeve diameter at the left end of the inner sleeve 4 is larger than that at the right end of the inner sleeve 4, and after the pressure applied to the inner sleeve 4 reaches a preset value, the starting ring 7 is sheared off and separated from the inner sleeve 4. At the moment, the wellhead is continuously pressed until the pressure value in the shaft reaches the pressure value required by shaft pressure test, the inner cylinder 4 starts to move rightwards, and then hydraulic oil in the right chamber 9 is compressed, so that the hydraulic oil flows into the time delay mechanism 6, after the wellhead is pressed to the preset pressure value of the pressure test, the right chamber 9 is communicated with the left chamber 8, the hydraulic oil in the right chamber 9 continuously flows into the left chamber 8 through the time delay mechanism 6, and the inner cylinder 4 continues to move rightwards, so that shaft pressure test operation is completed. When the inner cylinder 4 moves to the inner cavity to be communicated with the fracturing hole 201, the delay sliding sleeve is opened, and the establishment of a fracturing channel is completed. In the process, the delay mechanism 6 can control the flow rate of the hydraulic oil flowing from the right chamber 9 to the left chamber 8 by changing the wellhead pressurizing force.
According to the time-delay sliding sleeve provided by the embodiment of the invention, the inner cylinder 4 is arranged, and the cylinder diameter at the left end of the inner cylinder 4 is larger than that at the right end of the inner cylinder 4, so that the pressure on the right part of the inner cylinder 4 is larger and the inner cylinder 4 can move rightwards when a wellhead is pressed. Through setting up the actuating ring 7 to make inner tube 4 be connected with actuating ring 7, guaranteed that inner tube 4 and actuating ring 7 are connected the fastening, and both can separate smoothly after receiving certain pressure. By arranging the outer cylinder 2 and the time delay mechanism 6, a sealed annular space is arranged between the inner cylinder 4 and the outer cylinder 2, and the separating ring 5 is arranged in the middle of the inner cylinder 4, the annular space can be separated into a left chamber 8 and a right chamber 9, so that hydraulic oil in the right chamber 9 can flow into the left chamber 8 through the time delay mechanism 6 contained in a time delay channel of the separating ring 5, the inner cylinder 4 can be ensured to move further to the right, the flow of the hydraulic oil can be controlled, and the purpose of precise flow limitation is achieved. Through set up on the lateral wall of urceolus 2 and be located the left fracturing hole 201 of annular space, guaranteed when inner tube 4 moves the default distance right after, the inner chamber of inner tube 4 can communicate with this fracturing hole 201, establish the fracturing passageway smoothly. Therefore, the time-delay sliding sleeve provided by the embodiment of the invention can meet the construction requirement of establishing the first-stage fracturing channel, is simple to operate, short in operation period and low in cost, and can precisely control the communication time between the inner cavity of the inner barrel 4 and the fracturing hole 201 to realize the pressure test of a shaft.
In order to achieve the current and pressure limiting function of the extending mechanism 6, as shown in fig. 4, the time delay mechanism 6 includes: and the pressure limiting valve 601 and the flow control valve 602 are sequentially arranged in the delay channel from left to right.
Specifically, when the inner cylinder 4 starts moving rightward and compresses the hydraulic oil in the right chamber 9, the hydraulic oil first flows into the flow control valve 602, and the flow rate through the flow control valve 602 is different according to the magnitude of the wellhead pressurizing force. If the force of the hydraulic oil flowing through the flow control valve 602 acting on the pressure limiting valve 601 is smaller than the rated pressure of the pressure limiting valve 601, the pressure limiting valve 601 is in a closed state, and the hydraulic oil cannot flow into the left chamber 8. If the acting force of the hydraulic oil flowing through the flow control valve 602 on the pressure limiting valve 601 is larger than the rated pressure of the pressure limiting valve 601, the pressure limiting valve 601 is opened, the hydraulic oil flows into the left chamber 8, and the inner cylinder 4 moves to the right.
In order to prevent solid particles from slipping in the process of the time-delay sliding sleeve entering a well and cementing operation, which affects subsequent pressure test operation and smooth operation of establishing a fracturing channel, the fracturing hole 201 can be plugged by a soluble plug.
Wherein "soluble plug" refers to: plugs made with soluble materials are common in the art, and may be, for example, soluble magnesium aluminum alloys.
In order to ensure that the outer cylinder 2 is connected and fastened with the right joint 3 and simultaneously facilitate the installation of the starting ring 7, the outer cylinder 2 and the right joint 3 can be connected through a double male short section 10.
In order to ensure that the outer cylinder 2 has better sealing performance with the left joint 1, the inner cylinder 4 and the double male short section 10, first sealing rings can be arranged between the outer cylinder 2 and the left joint 1, the inner cylinder 4 and the double male short section 10.
In order to ensure that the double male short section 10 and the inner cylinder 4 have better sealing performance, a second sealing ring is arranged between the double male short section 10 and the inner cylinder 4.
In order to ensure that the double male short section 10 and the right joint 3 have better sealing performance, a third sealing ring is arranged between the double male short section 10 and the right joint 3.
In order to ensure that the left joint 1 is tightly connected with the outer cylinder 2 and is convenient to detach, the left joint 1 can be connected with the outer cylinder 2 in a threaded manner. Wherein, be provided with the internal thread on the left end inner wall of urceolus 2, be provided with the external screw thread with this internal thread looks adaptation on the outer wall of left side joint 1.
In summary, when the time-delay sliding sleeve provided by the embodiment of the invention is used for establishing the first-stage (front end) fracturing channel operation of the deep long-horizontal-stage shale gas well, the construction requirement for establishing the first-stage fracturing channel can be met, the operation is simple, the operation period is short, the cost is low, the communication time between the inner cavity of the inner cylinder 4 and the fracturing hole 201 can be precisely controlled, the pressure test of the shaft is realized, and when the pressure test of the shaft needs to be suspended due to other factors, the pressure in the inner cylinder 4 is only required to be reduced to the opening value of the pressure limiting valve 601.
In addition, the actuating ring of the present invention may be replaced by a shear pin or rupture disk. The starting ring, the shearing pin and the rupture disk all refer to the opening mode of the time-delay sliding sleeve, namely the time-delay sliding sleeve can be opened through the starting ring and also can be opened through the shearing pin or the rupture disk.
The time-delay sliding sleeve is suitable for vertical wells, highly-deviated wells and horizontal wells of natural gas wells, coal bed gas wells, shale gas wells and the like, is suitable for various well completion modes such as open hole well completion, casing well completion and the like, and is particularly suitable for first-section fracturing yield-increasing transformation construction of deep long-horizontal-section shale gas wells.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A time delay sliding sleeve, characterized in that, time delay sliding sleeve includes: connect (1), urceolus (2), right side joint (3) of connecting in order from left side to right side, the time delay sliding sleeve still includes: the device comprises an inner cylinder (4), a separating ring (5), a time delay mechanism (6) and a starting ring (7);
the cylinder diameter of the left end of the inner cylinder (4) is larger than that of the right end, and the inner cylinder is slidably sleeved in the outer cylinder (2);
the inner cylinder (4) is connected with the starting ring (7), a sealed annular space is arranged between the inner cylinder (4) and the outer cylinder (2), the starting ring (7) is used for being separated from the inner cylinder (4) after the pressure reaches a preset value, and the outer cylinder (2) is connected with the right joint (3) through a double male short section (10), so that the starting ring (7) is convenient to install; a fracturing hole (201) positioned on the left side of the annular space is formed in the side wall of the outer barrel (2);
the separating ring (5) is arranged in the annular space and is used for separating the annular space into a left chamber (8) and a right chamber (9), and a delay channel for accommodating the delay mechanism (6) is arranged on the separating ring (5);
the delay mechanism (6) comprises: the pressure limiting valve (601) and the flow control valve (602) are sequentially arranged in the delay channel from left to right;
hydraulic oil is arranged in the right chamber (9), and the delay mechanism (6) is used for controlling the flow of the hydraulic oil and the real-time on-off of the right chamber (9) and the left chamber (8);
in the process of the operation of the time-delay sliding sleeve, the left joint (1) and the right joint (3) are connected with the casing pipe and are pressed into the casing pipe from the wellhead, after the pressure applied to the inner cylinder (4) reaches a preset value, the starting ring (7) is sheared and separated from the inner cylinder (4), the pressure is continuously pressed until the inner cylinder (4) starts to move rightwards, thereby compressing the hydraulic oil in the right chamber (9) and leading the hydraulic oil to flow into the time delay mechanism (6), when the wellhead is pressed to a preset pressure testing value, the right chamber (9) is communicated with the left chamber (8), the hydraulic oil in the right chamber (9) continuously flows into the left chamber (8) through the time delay mechanism (6), when the inner cylinder (4) moves to the inner cavity and is communicated with the fracturing hole (201), the delay sliding sleeve is opened, and the establishment of a fracturing channel is completed.
2. The time delay slip of claim 1, wherein said fracture hole (201) is plugged by a dissolvable plug.
3. The time-delay sliding sleeve according to claim 1, wherein first sealing rings are arranged between the outer cylinder (2) and the left joint (1), the inner cylinder (4) and the double male short section (10).
4. The time-delay sliding sleeve according to claim 1, wherein a second sealing ring is arranged between the double male short section (10) and the inner cylinder (4).
5. The time-delay sliding sleeve according to claim 1, wherein a third sealing ring is arranged between the double male nipple (10) and the right joint (3).
6. The time-delay sliding sleeve as claimed in claim 1, wherein the left joint (1) is in threaded connection with the outer cylinder (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810957114.3A CN109339757B (en) | 2018-08-21 | 2018-08-21 | Time-delay sliding sleeve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810957114.3A CN109339757B (en) | 2018-08-21 | 2018-08-21 | Time-delay sliding sleeve |
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| CN109339757A CN109339757A (en) | 2019-02-15 |
| CN109339757B true CN109339757B (en) | 2021-03-09 |
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| CN201810957114.3A Active CN109339757B (en) | 2018-08-21 | 2018-08-21 | Time-delay sliding sleeve |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110080683B (en) * | 2019-03-09 | 2020-12-01 | 西安物华巨能爆破器材有限责任公司 | Hydraulic adjustable time delay tapping device |
| CN110593837B (en) * | 2019-09-17 | 2020-05-05 | 中国石油天然气股份有限公司西南油气田分公司工程技术研究院 | Fracturing construction operation method for soluble full-bore sliding sleeve |
| CN110541687B (en) * | 2019-09-23 | 2024-03-22 | 中国石油集团川庆钻探工程有限公司 | Toe end sliding sleeve capable of being opened in controlled time delay manner |
| CN111021990B (en) * | 2019-12-18 | 2023-07-25 | 中国石油天然气股份有限公司 | Toe-soluble end sliding sleeve for well cementation and completion and use method thereof |
| CN113803024B (en) * | 2020-06-12 | 2024-02-27 | 中国石油化工股份有限公司 | Toe end sliding sleeve device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202946130U (en) * | 2012-12-06 | 2013-05-22 | 中国石油集团西部钻探工程有限公司 | Differential pressure type sliding sleeve |
| CN205117285U (en) * | 2015-07-15 | 2016-03-30 | 北京佰文恒新能源服务有限公司 | Time delay starts fracturing sliding sleeve |
| CN105672943B (en) * | 2016-01-20 | 2018-07-10 | 中国石油化工股份有限公司 | A kind of full-bore sliding sleeve with solvable solution structure |
| CN107288602B (en) * | 2017-05-31 | 2019-11-12 | 中国石油天然气股份有限公司 | A kind of automatically controlled toe-end fracturing sliding bush |
| CN207437007U (en) * | 2017-10-24 | 2018-06-01 | 中石化石油工程技术服务有限公司 | Hydraulic delay switch DP formula sliding sleeve |
| CN207437005U (en) * | 2017-10-24 | 2018-06-01 | 中石化石油工程技术服务有限公司 | Band centering edge formula delayed start-up well cementation sliding sleeve |
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