CN113738304A - Toe end sliding sleeve with shaft pressure testing function - Google Patents
Toe end sliding sleeve with shaft pressure testing function Download PDFInfo
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- CN113738304A CN113738304A CN202111094547.9A CN202111094547A CN113738304A CN 113738304 A CN113738304 A CN 113738304A CN 202111094547 A CN202111094547 A CN 202111094547A CN 113738304 A CN113738304 A CN 113738304A
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- sliding sleeve
- toe end
- dabber
- track groove
- pressure testing
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- 238000012360 testing method Methods 0.000 title claims abstract description 30
- 238000007789 sealing Methods 0.000 claims abstract description 6
- 230000009471 action Effects 0.000 claims abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000005553 drilling Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003079 shale oil Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Classifications
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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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/10—Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole
-
- 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/10—Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole
- E21B34/108—Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole with time delay systems, e.g. hydraulic impedance mechanisms
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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
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
- E21B47/117—Detecting leaks, e.g. from tubing, by pressure testing
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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
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/06—Sleeve valves
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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)
- Geophysics (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a toe end sliding sleeve with a shaft pressure test function, which is characterized in that: including dabber and suit the overcoat outside the dabber and respectively with overcoat upper and lower both ends sealing connection's top connection and lower clutch, the dabber upper end is equipped with the radial mounting hole that is used for disposing the rupture piece from last to down in proper order, is used for installing the shaft hole of ejector pin, is used for installing length orbit groove, the jet of sliding pin subassembly, is equipped with spring and piston at the dabber overcoat, the lower tip and the sliding pin subassembly looks butt of ejector pin, the both ends of spring respectively with sliding pin subassembly and piston butt, the piston is fixed between dabber and overcoat through starting the pin to can seal the outer jet that corresponds the jet setting on dabber's interior jet and the overcoat. The hydraulic opening and mechanical delay are adopted, compared with the conventional delay toe end sliding sleeve structure, the hydraulic opening and mechanical delay are more advanced, the delay action is more reliable, the delay time can be infinitely prolonged according to the on-site requirement under the condition of no advanced setting, the requirements of quickly completing the pressure test of a shaft and opening the first section of an oil-gas well can be met, perforation operation is not needed, and the hydraulic opening and mechanical delay is beneficial to realizing the aims of quick and safe operation and speed increasing and cost reducing for oil field users.
Description
Technical Field
The invention belongs to the technical field of oil exploitation, and particularly relates to a toe end sliding sleeve with a shaft pressure testing function, which is used in fracturing measure operation of an oil-gas well.
Background
In the field of petroleum industry, especially when casing staged fracturing is carried out on unconventional shale oil and gas wells, a pressure test needs to be carried out on a shaft before the first-stage fracturing transformation begins, and a communication channel between the first-stage casing and a stratum needs to be opened after the pressure test is finished. There are two ways to open the first segment at present: one is a drill pipe or oil pipe transmission perforation; the other is opened by the toe-end sliding sleeve being pressed. The drilling rod or oil pipe transmission perforation mode is mature and reliable in technology, but the construction time efficiency is low, and the drilling in an overlong horizontal well is limited; the toe end sliding sleeve mode is directly suppressed and opened, the construction timeliness is high, the cost is low, the risk is small, and the toe end sliding sleeve mode is not limited by the length of a horizontal section and is widely applied. The opening success rate of the existing toe end sliding sleeve technology is low, and the method mainly has the following technical defects:
1) the whole shaft is required to be tested for pressure by more than 90MPa before fracturing construction of a domestic shale gas well, the pressure bearing grade of a ground high-pressure manifold used in China at present is 15000psi, and the highest pressure limiting during construction is not allowed to exceed 100MPa, so that the pressure of the existing toe end sliding sleeve opening pump pressure needs to be controlled within the range of 90-100MPa, the pressure window allowed to be opened is very narrow, and the situation that the sliding sleeve is often failed to be opened on site often exists;
2) and in the process of the shaft test, according to the requirements: the pressure of the well mouth needs to be stabilized for 15min to 30min after the pressure reaches a certain value (90 MPa to 100 MPa). At this time, the toe end sliding sleeve is opened, and the time of the hydraulic oil inside the toe end sliding sleeve passing through the overflow mechanism is used for controlling the delayed opening time, such as CN110541687A and CN 110541687A. However, due to the influences of factors such as underground temperature, formation net pressure, hydraulic oil viscosity and the like, the delay often cannot meet the design requirement, and the pressure test time of the shaft is short.
Disclosure of Invention
The invention aims to solve the technical problem of providing a toe end sliding sleeve with a shaft pressure test function, which has small opening risk and no time delay.
The technical scheme adopted by the invention is as follows: the utility model provides a toe end sliding sleeve with pit shaft pressure testing function which characterized in that: including dabber and suit the overcoat outside the dabber and respectively with overcoat upper and lower both ends sealing connection's top connection and lower clutch, the dabber upper end is equipped with the radial mounting hole that is used for disposing the rupture piece from last to down in proper order, is used for installing the shaft hole of ejector pin, is used for installing length orbit groove, the jet of sliding pin subassembly, is equipped with spring and piston at the dabber overcoat, the lower tip and the sliding pin subassembly looks butt of ejector pin, the both ends of spring respectively with sliding pin subassembly and piston butt, the piston is fixed between dabber and overcoat through starting the pin to can seal the outer jet that corresponds the jet setting on dabber's interior jet and the overcoat.
According to the technical scheme, the long and short track grooves comprise limit points on the zigzag track grooves, limit points under the track grooves and end points under the track grooves, wherein the limit points are continuously arranged along the circumferential direction of the mandrel, the track grooves are arranged between the limit points under the track grooves, track lines formed by the limit points under the track grooves are wavy lines, the end points under the track grooves are track grooves which are communicated with the wavy lines and extend for a certain distance along the axial direction of the mandrel, and the sliding pin component slides along with the long and short track grooves under the action of the ejector rod.
According to above-mentioned technical scheme, limit point encloses by two first inclined planes and the first perpendicular that are certain angle setting and closes and forms on every orbit groove, limit point encloses by two second inclined planes and the second perpendicular that are certain angle setting and closes and forms under the orbit groove, wherein, the setting of staggering of upper and lower limit point in the orbit groove.
According to the technical scheme, the groove depth of the long and short track grooves is 2.5-5 mm.
According to the technical scheme, the linear distance between the upper limit point and the lower limit point of the track groove is smaller than the distance of the shaft hole, and the linear distance between the upper limit point of the track groove and the lower final point of the track groove is larger than the distance of the ejector rod in the shaft hole.
According to the technical scheme, a lower terminal point of each track groove is arranged between the lower limit points of every three track grooves.
According to the technical scheme, at least two rupture discs are arranged on the mandrel, and the rupture discs are pressed on the mandrel through the pressing cap.
According to the technical scheme, the sliding pin assembly comprises a backing ring, a sliding ring and a sliding pin, wherein the backing ring and the sliding ring are sleeved outside the mandrel, and the sliding pin is arranged in the sliding ring.
According to the technical scheme, a plurality of shaft holes are uniformly distributed in the circumferential direction of the mandrel.
According to the technical scheme, the outer jet orifice is a waist-shaped hole.
The beneficial effects obtained by the invention are as follows: the hydraulic opening and mechanical delay are adopted, compared with the conventional delay toe end sliding sleeve structure, the hydraulic opening and mechanical delay are more advanced, the delay action is more reliable, the delay time can be infinitely prolonged according to the on-site requirement under the condition of no advanced setting, the requirements of quickly completing the pressure test of a shaft and opening the first section of an oil-gas well can be met, perforation operation is not needed, and the hydraulic opening and mechanical delay is beneficial to realizing the aims of quick and safe operation and speed increasing and cost reducing for oil field users.
Drawings
Fig. 1 is an exemplary block diagram provided by an embodiment of the present invention.
FIG. 2 is an expanded view of a track groove along the outer surface of a mandrel in an exemplary block diagram provided by an embodiment of the invention.
The reference numerals are explained below:
1. the device comprises an upper joint, 2, a sealing ring, 3, a breaking piece, 4, a pressing cap, 5, a push rod, 6, an outer sleeve, 7, a backing ring, 8, a sliding ring, 9, a sliding pin, 10, a spring, 11, a mandrel, 12, a piston, 13, a starting pin and 14, a lower joint. 11-1, an inner jet orifice, 6-1, an outer jet orifice, 14, 16, 18, 20, 22, an upper limit point of a track groove, 15, 17, 19, a lower limit point of the track groove, 21 and a lower terminal point of the track groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when in use, and are used only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The characteristics and properties of the toe end sliding sleeve with the function of testing the pressure in the well bore are further described in detail in the following with reference to the embodiments.
As shown in fig. 1, the embodiment provides a toe end sliding sleeve with a shaft pressure testing function, which comprises a mandrel 11, an outer sleeve 6 sleeved outside the mandrel 11, an upper joint 1 and a lower joint 14 which are respectively connected with the upper end and the lower end of the outer sleeve 6 in a sealing way through sealing rings 2, the upper end of the mandrel 11 is sequentially provided with a radial mounting hole for configuring the rupture disc 3, a shaft hole for mounting the mandril 5, a long and short track groove for installing a sliding pin component and a jet orifice from top to bottom, a spring 10 and a piston 12 are arranged outside the mandrel 11, the lower end part of the mandril 5 is abutted with the sliding pin component, the two ends of the spring 10 are respectively abutted with a sliding pin assembly and a piston 12, the piston 12 is fixed between the mandrel 11 and the outer sleeve 6 through a starting pin, and can seal the inner jet orifice on the mandrel 11 and the outer jet orifice which is arranged on the outer sleeve 6 and is in a waist-shaped hole corresponding to the jet orifice.
In this embodiment, at least two rupture discs are provided on the mandrel 11, which rupture discs are press-fitted on the mandrel 11 by means of a press cap 4. 4 shaft holes are uniformly distributed in the circumferential direction of the mandrel 11, and the ejector rods 5 can axially move in the shaft holes. The sliding pin assembly comprises a backing ring 7, a sliding ring 8 and a sliding pin 9, wherein the backing ring 7 and the sliding ring 8 are sleeved outside the mandrel 11, and the sliding pin 9 is installed in the sliding ring 8 and can slide in a long track groove and a short track groove on the outer circle surface of the mandrel 11. A spring 10 is mounted between the slide ring 8 and the piston 12. The piston 12 is fixed between the outer sleeve 6 and the mandrel 11 through a plurality of starting pins 13 and blocks the communication between the injection port 11-1 and the kidney-shaped hole 6-1.
As shown in fig. 2, the long and short track grooves include upper zigzag track groove limit points 14, 16, 18, 20, 22, lower zigzag track groove limit points 15, 17, 19, and a lower track groove limit point 21 disposed between the lower limit points of each 3 track grooves, the track line formed by the upper limit point and the lower limit point of the track groove is wavy, the lower track groove limit point is a track groove extending a certain distance in the axial direction of the mandrel 11 and communicating with the wavy track line, and the sliding pin assembly slides along the long and short track groove track under the action of the mandrel 5. Wherein, the groove depth of the long and short track grooves is 2.5-5 mm. The linear distance between the upper limit point and the lower limit point of the track groove is smaller than that of the shaft hole, and the linear distance between the upper limit point of the track groove and the lower final point of the track groove is larger than that of the mandril 5 in the shaft hole.
As shown in fig. 2, the upper limit point of each track groove is formed by two first inclined planes and first vertical planes which are arranged at a certain angle, and the lower limit point of each track groove is formed by two second inclined planes and second vertical planes which are arranged at a certain angle, wherein the upper limit point and the lower limit point of each track groove are arranged in a staggered manner, so that the sliding pin can continuously slide between the upper limit point and the lower limit point.
The toe end sliding sleeve with the shaft pressure test function is assembled on the ground according to the figure 1, the upper end and the lower end of the toe end sliding sleeve are respectively connected with a casing pipe, and the toe end sliding sleeve is put into the stratum along with the casing pipe after the drilling is finished. And after the well cementation operation is finished, the ground is pressed to carry out pressure test on the shaft.
When the ground pressure is gradually increased to 90-100MPa from 0, the rupture disc 3 is broken down (the static pressure of a shaft liquid column is not more than the breakdown pressure of the rupture disc is not more than the static pressure of the shaft liquid column and the shaft test pressure), the liquid acts on the ejector rod 5 after entering, the backing ring 7 and the sliding ring 8 are pushed to move, and the sliding ring 8 compresses the spring 10 and drives the sliding pin 9 to slide from the top dead center position 14 of the track groove on the surface of the mandrel 11 to the bottom dead center position 15 of the track groove. When the ground pressure is released to 0, the slip ring 8 pushes the slide pin 9 again from the bottom dead center position 15 to the top dead center position 16 of the track groove under the force of the spring.
When the pressure of the shaft is tested again, the ground pressure is gradually increased from 0 to 90-100MPa, the sliding ring 8 is pushed by the ejector rod 5 to compress the spring 10 and drive the sliding pin 9 to slide from the upper dead center position 16 of the track groove to the lower dead center position 17 of the track groove.
By analogy, the ground can finish three times of pressure tests on the shaft.
During the pressure test, the sliding pin 9 slides from the top dead center position 14, 16, 18, 20 of the track groove on the surface of the mandrel 11 to the bottom dead center position 15, 17, 19 of the track groove. Since the distance from the top dead center positions 14, 16, 18, 20 to the bottom dead center positions 15, 17, 19 is smaller than the distance by which the jack 5 slides out of the shaft hole, the pressure at the upper end of the jack 5 cannot be transmitted to the piston 12, and the sliding sleeve cannot be opened.
When the sliding pins 9 respectively reach the bottom dead center positions, the pressure stabilization delay time required by the ground for the pressure test of the shaft is not limited as long as the reversing of the sliding pins 9 cannot be completed without pressure relief on the ground.
When the sliding sleeve needs to be opened, the ejector rod 5 pushes the sliding ring 8 to compress the spring 10 and drive the sliding pin 9 to slide from the top dead center position 20 of the track groove on the surface of the mandrel 11 to the bottom dead center position 21 of the track groove through fourth ground pressing. The distance from the top dead center position 20 to the bottom dead center position 21 is larger than the moving position of the jack 5 in the shaft hole, and the jack 5 is pushed out of the shaft hole by pressure. The hydraulic pressure is transmitted from the pressure cap 4, the rupture disk 3, and the shaft hole to the piston 12. When the pressure reaches the design value, the piston 12 moves the shear start pin 13. The piston 12 moves downwards continuously, and the jet orifice 11-1 of the mandrel 11 is communicated with the waist-shaped hole 6-1 of the outer sleeve 6. The high-pressure liquid in the sleeve enters the stratum through the jet orifice 11-1 and the waist-shaped hole 6-1.
The hydraulic opening and mechanical delay are adopted, compared with the conventional delay toe end sliding sleeve, the hydraulic delay toe end sliding sleeve is simpler in structure, small in opening risk and free of delay time, can meet the requirement of quick development of oil and gas wells (such as shale oil and gas wells), and achieves speed acceleration and cost reduction.
The embodiments described above are some, but not all embodiments of the present application. The detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Claims (10)
1. The utility model provides a toe end sliding sleeve with pit shaft pressure testing function which characterized in that: including dabber and suit the overcoat outside the dabber and respectively with overcoat upper and lower both ends sealing connection's top connection and lower clutch, the dabber upper end is equipped with the radial mounting hole that is used for disposing the rupture piece from last to down in proper order, is used for installing the shaft hole of ejector pin, is used for installing length orbit groove, the jet of sliding pin subassembly, is equipped with spring and piston at the dabber overcoat, the lower tip and the sliding pin subassembly looks butt of ejector pin, the both ends of spring respectively with sliding pin subassembly and piston butt, the piston is fixed between dabber and overcoat through starting the pin to can seal the outer jet that corresponds the jet setting on dabber's interior jet and the overcoat.
2. The toe end sliding sleeve with the shaft pressure testing function as claimed in claim 1, wherein: the long and short track grooves comprise zigzag track groove upper limit points, track groove lower limit points and track groove lower limit points which are continuously arranged along the circumferential direction of the mandrel, and track grooves arranged between the plurality of track groove lower limit points, track lines formed by the track groove upper limit points and the track groove lower limit points are wavy lines, the track grooves which are communicated with the wavy lines are arranged at the track groove lower limit points and extend for a certain distance in the axial direction of the mandrel, and the sliding pin assembly slides along with the long and short track groove tracks under the action of the ejector rod.
3. The toe end sliding sleeve with the shaft pressure testing function as claimed in claim 2, wherein: the limit point is enclosed by two first inclined planes and the first perpendicular that are certain angle setting and closes and forms on every orbit groove, limit point is enclosed by two second inclined planes and the second perpendicular that are certain angle setting and closes and forms under the orbit groove, wherein, the setting of staggering of upper and lower limit point in the orbit groove.
4. The toe end sliding sleeve with the well bore pressure testing function according to claim 1 or 2, characterized in that: the groove depth of the long and short track grooves is 2.5-5 mm.
5. The toe end sliding sleeve with the well bore pressure testing function according to claim 2, is characterized in that: the linear distance between the upper limit point and the lower limit point of the track groove is smaller than that of the shaft hole, and the linear distance between the upper limit point of the track groove and the lower final point of the track groove is larger than that of the ejector rod in the shaft hole.
6. The toe end sliding sleeve with the well bore pressure testing function according to claim 1 or 2, characterized in that: and a lower final point of the track groove is arranged between the lower limit points of every three track grooves.
7. The toe end sliding sleeve with the well bore pressure testing function according to claim 1 or 2, characterized in that: at least two rupture discs are arranged on the mandrel, and the rupture discs are pressed on the mandrel through a pressing cap.
8. The toe end sliding sleeve with the well bore pressure testing function according to claim 1 or 2, characterized in that: the sliding pin assembly comprises a backing ring, a sliding ring and a sliding pin, and the backing ring, the sliding ring and the sliding pin are all sleeved outside the mandrel.
9. The toe end sliding sleeve with the well bore pressure testing function according to claim 1 or 2, characterized in that: a plurality of shaft holes are uniformly distributed in the circumferential direction of the mandrel.
10. The toe end sliding sleeve with the well bore pressure testing function according to claim 1 or 2, characterized in that: the outer jet orifice is a waist-shaped hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111094547.9A CN113738304B (en) | 2021-09-17 | 2021-09-17 | Toe end sliding sleeve with shaft pressure testing function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111094547.9A CN113738304B (en) | 2021-09-17 | 2021-09-17 | Toe end sliding sleeve with shaft pressure testing function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113738304A true CN113738304A (en) | 2021-12-03 |
| CN113738304B CN113738304B (en) | 2023-04-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111094547.9A Active CN113738304B (en) | 2021-09-17 | 2021-09-17 | Toe end sliding sleeve with shaft pressure testing function |
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| CN (1) | CN113738304B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114753803A (en) * | 2022-04-02 | 2022-07-15 | 中国石油化工股份有限公司 | Rail-type pressure-testing toe-end sliding sleeve and using method thereof |
| CN118327518A (en) * | 2024-06-14 | 2024-07-12 | 德州景美石油机械有限公司 | Toe end sliding sleeve with delay opening control function |
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