CN109296349B - Piston type delay opening toe end sliding sleeve - Google Patents

Piston type delay opening toe end sliding sleeve Download PDF

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Publication number
CN109296349B
CN109296349B CN201811309139.9A CN201811309139A CN109296349B CN 109296349 B CN109296349 B CN 109296349B CN 201811309139 A CN201811309139 A CN 201811309139A CN 109296349 B CN109296349 B CN 109296349B
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China
Prior art keywords
opening
piston
hole
fracturing
hydraulic oil
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CN201811309139.9A
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CN109296349A (en
Inventor
潘勇
王娟
石孝志
张毅超
牛科坤
李斌
谢明
张敏
张道鹏
钟兴久
张皓月
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China National Petroleum Corp
CNPC Chuanqing Drilling Engineering Co Ltd
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China National Petroleum Corp
CNPC Chuanqing Drilling Engineering Co Ltd
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Priority to CN201811309139.9A priority Critical patent/CN109296349B/en
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B34/00Valve arrangements for boreholes or wells
    • E21B34/06Valve arrangements for boreholes or wells in wells
    • E21B34/063Valve or closure with destructible element, e.g. frangible disc
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B34/00Valve arrangements for boreholes or wells
    • E21B34/06Valve arrangements for boreholes or wells in wells
    • E21B34/08Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
    • E21B34/085Valve 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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  • 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)
  • Fluid-Pressure Circuits (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

The invention discloses a piston type time-delay opening toe end sliding sleeve, which comprises an upper joint, a shell, a time-delay mechanism, a central tube, an opening mechanism and a lower joint, wherein the upper joint and the lower joint are respectively connected with the upper end and the lower end of the shell and are in sealing fit, the upper end of the central tube is connected with the upper joint and is in sealing fit, the lower end of the central tube is in sealing fit with the lower joint, the time-delay mechanism is arranged between the shell and the central tube, and the opening mechanism is arranged in the lower joint; the shell is radially provided with a fracturing outer port, the central tube is radially provided with a fracturing inner port corresponding to the fracturing outer port, and the fracturing outer port and the fracturing inner port are sealed by an opening piston of a time delay mechanism; when the well bore liquid reaches a set pressure value, the opening mechanism is started to drive the time delay mechanism to start, and after a set time length, the opening piston is pushed to move until the outer fracturing port is communicated with the inner fracturing port. The invention can effectively solve the technical problems of harsh opening pressure error range, low opening success rate and the like of the toe end sliding sleeve in the prior art.

Description

Piston type delay opening toe end sliding sleeve
Technical Field
The invention relates to a piston type delay opening toe end sliding sleeve, which is used for realizing fracturing transformation of the first section of a shale gas well and belongs to the technical field of manufacturing of downhole operation tools in the petroleum and natural gas industry.
Background
At present, two methods exist for fracturing and reforming the first section of the shale gas well: one is coiled tubing transmission perforation; the other is a toe end sliding sleeve. The technique of the continuous oil pipe transmission perforation mode is mature and reliable, but the construction time is low, and the feeding is limited in an ultra-long horizontal well; the toe end sliding sleeve mode is directly pressed to open, the construction time is high, and the toe end sliding sleeve mode is not limited by the length of the horizontal section. Compared with a continuous oil pipe transmission perforation mode, the toe end sliding sleeve has the advantages of high operation time efficiency, low cost, small risk, unlimited operation depth and the like, but because the toe end sliding sleeve technology is immature, the opening success rate is low, and the shale gas first stage fracturing channel still takes continuous oil pipe transmission perforation as the main part. Because shale gas reservoir permeability is extremely low, shale gas yield is closely related to drilling quantity and fracturing scale, along with continuous progress of drilling technology, an ultra-long horizontal section (more than 2500 m) horizontal well is a development trend of efficiently developing shale gas, and a continuous oil pipe transmission perforation mode cannot meet the fracturing perforation requirements of the first section of a deep and ultra-long horizontal well. The existing toe end sliding sleeve technology has low opening success rate, and mainly has the following technical defects:
1. the method is characterized in that the full-well pressure test is needed to be carried out for 90MPa before the fracturing construction of the domestic shale gas well to check the tightness of a shaft, the pressure bearing grade of a high-pressure manifold on the ground is 15000psi at present, and the highest pressure limit is not allowed to exceed 100MPa during the construction, so that the existing toe end sliding sleeve opening pump pressure can only be in the range of 90-100MPa, and the allowable opening pressure error range is harsh;
2. most of the existing toe end sliding sleeves are opened in a rupture disc rupture mode, and after cement slurry is solidified, the opening pressure of the existing toe end sliding sleeves is greatly influenced, so that the toe end sliding sleeves are low in opening success rate.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provides a piston type delay opening toe end sliding sleeve. The invention can effectively solve the technical problems of harsh opening pressure error range, low opening success rate and the like of the toe end sliding sleeve in the prior art.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a piston type delay opening toe end sliding sleeve is characterized in that: the device comprises an upper joint, a shell, a time delay mechanism, a central tube, an opening mechanism and a lower joint, wherein the upper joint and the lower joint are respectively connected with the upper end and the lower end of the shell and are in sealing fit, the upper end of the central tube is connected with the upper joint and is in sealing fit, the lower end of the central tube is in sealing fit with the lower joint, the time delay mechanism is arranged between the shell and the central tube, and the opening mechanism is arranged in the lower joint; the shell is radially provided with a fracturing outer port, the central tube is radially provided with a fracturing inner port corresponding to the fracturing outer port, and the fracturing outer port and the fracturing inner port are sealed by an opening piston of a time delay mechanism; when the well bore liquid reaches a set pressure value, the opening mechanism is started to drive the time delay mechanism to start, and after a set time length, the opening piston is pushed to move until the outer fracturing port is communicated with the inner fracturing port.
The central tube middle part outer wall is provided with the step, and step department axial is provided with the isolation hole, and step surface and shells inner wall sealing fit.
The time delay mechanism comprises an opening air cavity, an opening piston, a time delay cavity, a separation plug, a damping nozzle, a filter plate, a hydraulic oil cavity and a time delay piston, wherein the opening air cavity, the time delay cavity and the hydraulic oil cavity are gaps between a central tube and a shell, the opening air cavity is positioned between an upper joint and the opening piston, the time delay cavity is positioned between the opening piston and a central tube step, the hydraulic oil cavity is positioned between the central tube step and a lower joint, the opening piston is fixed on the outer surface of the central tube through an opening shear pin and is in sealing fit with the shell and the central tube, the separation plug is fixed on one end of the separation hole close to the time delay cavity through the shear pin and is in sealing fit with the separation hole, the damping nozzle is connected to the other end of the separation hole and is in sealing fit with the separation hole, the filter plate is arranged adjacent to the damping nozzle at one end of the hydraulic oil cavity, the time delay piston is arranged at the other end of the hydraulic oil cavity and is in sealing fit with the hydraulic oil cavity, and hydraulic oil is injected into the hydraulic oil cavity.
The lower joint is radially provided with a control hole, a pressure transmission hole is axially arranged, and the control hole is communicated with the pressure transmission hole.
The opening mechanism comprises a sealing plug and a control piston, the sealing plug is radially connected with the lower joint through threads and is in sealing fit with the control hole, and the control piston is fixed inside the sealing plug through a control shear pin and is in sealing fit with the inner wall of the sealing plug; when the shear pin is controlled to shear and the opening mechanism is started, the piston is controlled to move to the bottom of the sealing plug, and liquid enters the hydraulic oil cavity through the pressure transmission hole to push the delay piston to move upwards.
And an overflow annular groove is arranged in the control hole, when the control piston moves to the bottom of the sealing plug, the sealing fit position of the control piston and the sealing plug moves downwards, and liquid sequentially enters the overflow annular groove through the gap between the control piston and the sealing plug and the gap between the shear pin hole and then flows into the pressure transmission hole.
The sealing plug is provided with a radial overflow hole, the overflow hole is communicated with the overflow annular groove, and when the control piston moves to the bottom of the sealing plug, liquid sequentially flows into the pressure transmission hole through the gap between the control piston and the sealing plug, the overflow hole and the overflow annular groove.
The delay piston moves upwards to push hydraulic oil to enter the damping nozzle to flow into the isolation hole through the filter plate, when the hydraulic oil in the isolation hole reaches a set pressure value, the shear pin is sheared off, the hydraulic oil enters the delay cavity to start the delay mechanism, when the hydraulic oil in the delay cavity reaches the set pressure value after a set period of time, the shear pin is started to shear off, and the opening piston is pushed to move upwards to enter the opening air cavity until the outer fracturing port is communicated with the inner fracturing port.
The upper joint and the lower joint are respectively and coaxially connected with the upper end and the lower end of the shell through threads, the upper end of the central tube is coaxially connected with the upper joint through threads, and the lower end of the central tube is coaxially and hermetically matched with the lower joint.
The damping nozzle is coaxially connected to the other end of the isolation hole through threads.
One end of the sealing plug is closed, the other end of the sealing plug is communicated, and the communicated end is communicated with the inner cavity of the shaft.
The invention has the advantages that:
1. the opening mechanism adopts a piston structure to replace a rupture disc structure, so that the opening mechanism has the function of isolating cement paste, reduces the error of opening pressure, and reduces the influence on the opening pressure of the toe end sliding sleeve after the cement paste is solidified.
2. The delay mechanism can be started under the pressure lower than the pressure test pressure, and the sliding sleeve is opened through a period of delay process, so that the allowable error range of the opening pressure of the toe end sliding sleeve is enlarged, and the opening success rate is improved.
3. The invention is used for realizing the fracturing transformation of the first section of the shale gas well, can effectively solve the technical problems of harsh opening pressure error range, low opening success rate and the like of the toe end sliding sleeve in the prior art, can effectively reduce the development cost of shale gas, and has wide application prospect.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is an enlarged schematic view of the flow direction of the liquid after the opening mechanism of the present invention is activated;
marked in the figure as: 1. the hydraulic pressure device comprises an upper connector, 2, a shell, 3, a time delay mechanism, 4, a central tube, 5, an opening mechanism, 6, a lower connector, 7, an opening air cavity, 8, an opening piston, 9, a fracturing inner port, 10, a fracturing outer port, 11, an opening shear pin, 12, a time delay cavity, 13, a shear pin, 14, an isolation plug, 15, an isolation hole, 16, a damping nozzle, 17, a filter plate, 18, a hydraulic oil cavity, 19, a time delay piston, 20, a pressure transmission hole, 21, a control hole, 22, a sealing plug, 23, a control piston, 24 and a control shear pin.
Detailed Description
Example 1
The piston type time-delay opening toe end sliding sleeve comprises an upper joint 1, a shell 2, a time-delay mechanism 3, a central tube 4, an opening mechanism 5 and a lower joint 6, wherein the upper joint 1 and the lower joint 6 are respectively connected with the upper end and the lower end of the shell 2 and are in sealing fit, the upper end of the central tube 4 is connected with the upper joint 1 and is in sealing fit, the lower end of the central tube 4 is in sealing fit with the lower joint 6, the time-delay mechanism 3 is arranged between the shell 2 and the central tube 4, and the opening mechanism 5 is arranged in the lower joint 6; the shell 2 is radially provided with a fracturing outer port 10, the central tube 4 is radially provided with a fracturing inner port 9 corresponding to the fracturing outer port 10, and the fracturing outer port 10 and the fracturing inner port 9 are sealed by an opening piston 8 of the delay mechanism 3; when the well bore liquid reaches a set pressure value, the opening mechanism 5 is started to drive the delay mechanism 3 to start, and after a set time period, the opening piston 8 is pushed to move until the fracturing outer port 10 is communicated with the fracturing inner port 9.
The outer wall of the middle part of the central tube 4 is provided with a step, an isolating hole 15 is axially arranged at the step, and the outer surface of the step is in sealing fit with the inner wall of the shell 2.
The delay mechanism 3 comprises an opening air cavity 7, an opening piston 8, a delay cavity 12, a separation plug 14, a damping nozzle 16, a filter plate 17, a hydraulic oil cavity 18 and a delay piston 19, wherein the opening air cavity 7, the delay cavity 12 and the hydraulic oil cavity 18 are gaps between the central tube 4 and the shell 2, the opening air cavity 7 is positioned between the upper joint 1 and the opening piston 8, the delay cavity 12 is positioned between the opening piston 8 and the step of the central tube 4, the hydraulic oil cavity 18 is positioned between the step of the central tube 4 and the lower joint 6, the opening piston 8 is fixed on the outer surface of the central tube 4 through opening shear pins 11 and is in sealing fit with the shell 2 and the central tube 4, the separation plug 14 is fixed on one end of the separation hole 15 close to the delay cavity 12 through shear pins 13 and is in sealing fit with the separation hole 15, the damping nozzle 16 is connected to the other end of the separation hole 15 and is in sealing fit with the separation hole 15, the filter plate 17 is arranged on one end of the hydraulic oil cavity 18 and is adjacent to the damping nozzle 16, the delay piston 19 is arranged on the other end of the hydraulic oil cavity 18 and is in sealing fit with the hydraulic oil cavity 18, and hydraulic oil cavity 18 is filled with hydraulic oil.
The lower joint 6 is radially provided with a control hole 21, a pressure transmission hole 20 is axially arranged, and the control hole 21 is communicated with the pressure transmission hole 20.
The opening mechanism 5 comprises a sealing plug 22 and a control piston 23, the sealing plug 22 is radially connected with the lower joint 6 through threads and is in sealing fit with the control hole 21, and the control piston 23 is fixed inside the sealing plug 22 through a control shear pin 24 and is in sealing fit with the inner wall of the sealing plug 22; when the control shear pin 24 is sheared off and the opening mechanism 5 is started, the control piston 23 moves to the bottom of the sealing plug 22, and liquid enters the hydraulic oil cavity 18 through the pressure transmission hole 20 to push the delay piston 19 to move upwards.
An overflow annular groove is arranged in the control hole 21, when the control piston 23 moves to the bottom of the sealing plug 22, the sealing fit position of the control piston 23 and the sealing plug 22 moves downwards, and liquid sequentially enters the overflow annular groove through a gap between the control piston 23 and the sealing plug 22 and a shear pin hole gap and then flows into the pressure transmission hole 20.
The sealing plug 22 is provided with a radial overflow hole, the overflow hole is communicated with an overflow annular groove, and when the control piston 23 moves to the bottom of the sealing plug 22, liquid sequentially flows into the pressure transmission hole 20 through a gap between the control piston 23 and the sealing plug 22, the overflow hole and the overflow annular groove.
The delay piston 19 moves upwards to push hydraulic oil to enter the damping nozzle 16 through the filter plate 17 and flow into the isolation hole 15, when the hydraulic oil in the isolation hole 15 reaches a set pressure value, the shear pin 13 is sheared off, the hydraulic oil enters the delay cavity 12 to start the delay mechanism 3, when the hydraulic oil in the delay cavity 12 reaches the set pressure value after a set period of time, the opening shear pin 11 is sheared off, and the opening piston 8 is pushed to move upwards to enter the opening air cavity 7 until the fracturing outer port 10 is communicated with the fracturing inner port 9.
The upper joint 1 and the lower joint 6 are respectively and coaxially connected with the upper end and the lower end of the shell 2 through threads, the upper end of the central tube 4 is coaxially connected with the upper joint 1 through threads, and the lower end is coaxially and hermetically matched with the lower joint 6.
The damping nozzle 16 is coaxially connected to the other end of the isolation hole 15 through threads.
The sealing plug 22 is closed at one end and is communicated with the inner cavity of the shaft at the other end.
Example 2
As shown in the figure, the invention mainly comprises an upper joint 1, a shell 2, a time delay mechanism 3, a central tube 4, an opening mechanism 5 and a lower joint 6, wherein the upper joint 1 and the lower joint 6 are respectively and coaxially connected and in sealing fit with the upper end and the lower end of the shell 2 through threads, the upper end of the central tube 4 is coaxially connected and in sealing fit with the upper joint 1 through threads, the lower end of the central tube 4 is coaxially and in sealing fit with the lower joint 6, the time delay mechanism 3 is arranged between the shell 2 and the central tube 4, and the opening mechanism 5 is arranged inside the lower joint 6.
In this embodiment, the housing 2 is radially provided with a fracture outer port 10.
In the embodiment, the central tube 4 is radially provided with a fracturing inner port 9, an isolation hole 15 is axially arranged at a step in the middle of the central tube 4, and the outer surface of the step is in sealing fit with the inner wall of the shell 2.
In this embodiment, the delay mechanism 3 mainly comprises an opening air cavity 7, an opening piston 8, a delay cavity 12, a separation plug 14, a damping nozzle 16, a filter plate 17, a hydraulic oil cavity 18 and a delay piston 19, wherein the opening piston 8 is fixed on the outer surface of the central tube 4 through an opening shear pin 11 and is simultaneously in sealing fit with the shell 2 and the central tube 4, the separation plug 14 is fixed on one end, close to the delay cavity 12, of the separation hole 15 through a shear pin 13 and is in sealing fit with the separation hole 15, the damping nozzle 16 is coaxially connected to the other end of the separation hole 15 through threads and is in sealing fit with the separation hole 15, the filter plate 17 is installed at one end of the hydraulic oil cavity 18 and adjacent to the damping nozzle 16, the delay piston 19 is installed at the other end of the hydraulic oil cavity 18 and is in sealing fit with the hydraulic oil cavity 18, and hydraulic oil is injected into the hydraulic oil cavity 18.
In this embodiment, the lower joint 6 is radially provided with a control hole 21, axially provided with a pressure transmission hole 20, and the control hole 21 is internally provided with an overflow annular groove.
In this embodiment, the opening mechanism 5 mainly comprises a sealing plug 22 and a control piston 23, the sealing plug 22 is radially connected with the lower joint 6 through threads and is in sealing fit with the control hole 21, and the control piston 23 is fixed inside the sealing plug 22 through a control shear pin 24 and is in sealing fit with the inner wall of the sealing plug 22.
The working flow and principle are as follows:
when the shaft liquid reaches a set pressure value, the shear pin 24 is controlled to shear, the control piston 23 falls into the bottom of the sealing plug 22, namely the opening mechanism is started, the liquid enters the pressure transmission hole 20 through the overflow annular groove to push the delay piston 19 to move upwards, the delay piston 19 can push hydraulic oil to enter the damping nozzle 16 through the filter plate 17 to flow into the isolation hole 15, when the hydraulic oil in the isolation hole 15 reaches the set pressure value, the shear pin 13 shears, the hydraulic oil can enter the delay cavity 12, namely the delay mechanism 3 is started, when the hydraulic oil in the delay cavity 12 reaches the set pressure value, the opening shear pin 11 shears, the opening piston 8 can be pushed to move upwards to enter the opening air cavity 7 until the outer fracturing port 10 is communicated with the inner fracturing port 9, namely the toe end sliding sleeve is opened.

Claims (7)

1. A piston type delay opening toe end sliding sleeve is characterized in that: the device comprises an upper joint (1), a shell (2), a time delay mechanism (3), a central tube (4), an opening mechanism (5) and a lower joint (6), wherein the upper joint (1) and the lower joint (6) are respectively connected with the upper end and the lower end of the shell (2) and are in sealing fit, the upper end of the central tube (4) is connected with the upper joint (1) and is in sealing fit, the lower end of the central tube is in sealing fit with the lower joint (6), the time delay mechanism (3) is arranged between the shell (2) and the central tube (4), and the opening mechanism (5) is arranged in the lower joint (6); the shell (2) is radially provided with a fracturing outer port (10), the central tube (4) is radially provided with a fracturing inner port (9) corresponding to the fracturing outer port (10), and the space between the fracturing outer port (10) and the fracturing inner port (9) is closed by an opening piston (8) of the delay mechanism (3); when the well bore liquid reaches a set pressure value, the opening mechanism (5) is started to drive the delay mechanism (3) to start, and after a set time length, the opening piston (8) is pushed to move until the fracturing outer port (10) is communicated with the fracturing inner port (9);
the time delay mechanism (3) comprises an opening air cavity (7), an opening piston (8), a time delay cavity (12), a separating plug (14), a damping nozzle (16), a filter plate (17), a hydraulic oil cavity (18) and a time delay piston (19), wherein the opening air cavity (7), the time delay cavity (12) and the hydraulic oil cavity (18) are gaps between the central pipe (4) and the shell (2), the opening air cavity (7) is positioned between the upper joint (1) and the opening piston (8), the time delay cavity (12) is positioned between the opening piston (8) and a step of the central pipe (4), the hydraulic oil cavity (18) is positioned between the step of the central pipe (4) and the lower joint (6), the opening piston (8) is fixed on the outer surface of the central pipe (4) through an opening shear pin (11) and is in sealing fit with the shell (2) and the central pipe (4), the separating plug (14) is fixed on one end of the separating hole (15) close to the time delay cavity (12) through a shear pin (13) and is in sealing fit with the separating hole (15), the damping nozzle (16) is connected with the separating hole (15) and the other end is connected with the damping nozzle (15) coaxially through the damping nozzle (15) through the sealing hole (16), the filter plate (17) is arranged at one end of the hydraulic oil cavity (18) and adjacent to the damping nozzle (16), the delay piston (19) is arranged at the other end of the hydraulic oil cavity (18) and is in sealing fit with the hydraulic oil cavity (18), and hydraulic oil is injected into the hydraulic oil cavity (18);
the opening mechanism (5) comprises a sealing plug (22) and a control piston (23), the sealing plug (22) is radially connected with the lower joint (6) through threads and is in sealing fit with the control hole (21), and the control piston (23) is fixed inside the sealing plug (22) through a control shear pin (24) and is in sealing fit with the inner wall of the sealing plug (22); when the control shear pin (24) is sheared and the opening mechanism (5) is started, the control piston (23) moves to the bottom of the sealing plug (22), and liquid enters the hydraulic oil cavity (18) through the pressure transmission hole (20) to push the delay piston (19) to move upwards.
2. The piston type delayed opening toe end sliding sleeve according to claim 1, wherein: the outer wall of the middle part of the central tube (4) is provided with a step, an isolation hole (15) is axially arranged at the step, and the outer surface of the step is in sealing fit with the inner wall of the shell (2).
3. The piston type delayed opening toe end sliding sleeve according to claim 2, wherein: the lower joint (6) is radially provided with a control hole (21), a pressure transmission hole (20) is axially arranged, and the control hole (21) is communicated with the pressure transmission hole (20).
4. A piston type delayed opening toe end sliding sleeve according to claim 3, wherein: an overflow annular groove is formed in the control hole (21), when the control piston (23) moves to the bottom of the sealing plug (22), the sealing fit position of the control piston (23) and the sealing plug (22) moves downwards, and liquid sequentially enters the overflow annular groove through a gap between the control piston (23) and the sealing plug (22) and a gap between the shear pin hole and then flows into the pressure transmission hole (20).
5. The piston type delayed opening toe end sliding sleeve according to claim 4, wherein: the sealing plug (22) is provided with a radial overflow hole, the overflow hole is communicated with an overflow annular groove, and when the control piston (23) moves to the bottom of the sealing plug (22), liquid sequentially flows into the pressure transmission hole (20) through a gap between the control piston (23) and the sealing plug (22), the overflow hole and the overflow annular groove.
6. The piston type delayed opening toe end sliding sleeve according to claim 5, wherein: the time delay piston (19) moves upwards to push hydraulic oil to enter the damping nozzle (16) through the filter plate (17) and flow into the isolation hole (15), when the hydraulic oil in the isolation hole (15) reaches a set pressure value, the shear pin (13) is sheared off, the hydraulic oil enters the time delay cavity (12) to start the time delay mechanism (3), when the hydraulic oil in the time delay cavity (12) reaches the set pressure value, the shear pin (11) is started to shear off, the opening piston (8) is pushed to move upwards to enter the opening air cavity (7) until the outer fracturing port (10) is communicated with the inner fracturing port (9).
7. The piston type delayed opening toe end sliding sleeve according to claim 6, wherein: the upper joint (1) and the lower joint (6) are respectively and coaxially connected with the upper end and the lower end of the shell (2) through threads, the upper end of the central tube (4) is coaxially connected with the upper joint (1) through threads, and the lower end of the central tube is coaxially and hermetically matched with the lower joint (6).
CN201811309139.9A 2018-11-05 2018-11-05 Piston type delay opening toe end sliding sleeve Active CN109296349B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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CN109296349B true CN109296349B (en) 2023-09-15

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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
CN113530508B (en) * 2020-04-15 2023-05-26 中国石油天然气股份有限公司 Time delay sliding sleeve
CN111622710B (en) * 2020-06-09 2023-10-13 中国石油天然气集团有限公司 High-pressure activation pressure guide mechanism of sliding sleeve tool and use method
CN111691853B (en) * 2020-07-08 2024-01-19 中国石油天然气集团有限公司 High-pressure energy storage time-delay opening type toe end sliding sleeve and use method thereof
CN112049606B (en) * 2020-09-30 2024-02-06 中国石油天然气集团有限公司 Time-delay opening toe end sliding sleeve and opening method thereof
CN112983353B (en) * 2021-04-07 2023-03-10 中国石油天然气股份有限公司 Well cementation sliding sleeve with pressure compensation structure
CN113914819A (en) * 2021-09-30 2022-01-11 荆州市赛瑞能源技术有限公司 Hydraulic sliding sleeve for fracturing

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