CN115247546A - Toe end well cementation fracturing sliding sleeve - Google Patents
Toe end well cementation fracturing sliding sleeve Download PDFInfo
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- CN115247546A CN115247546A CN202110465111.XA CN202110465111A CN115247546A CN 115247546 A CN115247546 A CN 115247546A CN 202110465111 A CN202110465111 A CN 202110465111A CN 115247546 A CN115247546 A CN 115247546A
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- fracturing
- sleeve
- differential pressure
- sliding sleeve
- toe
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- 230000001681 protective effect Effects 0.000 claims abstract description 30
- 230000009471 action Effects 0.000 claims abstract description 7
- 239000004568 cement Substances 0.000 description 36
- 238000010276 construction Methods 0.000 description 9
- 239000002002 slurry Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 3
- 235000017491 Bambusa tulda Nutrition 0.000 description 3
- 241001330002 Bambuseae Species 0.000 description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 3
- 239000011425 bamboo Substances 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides a toe end well cementation fracturing sliding sleeve, which comprises: a cylindrical body portion provided with a plurality of fracturing holes in each of which a plug is fixedly installed, respectively; a protective cylinder fixedly sleeved in the body part, wherein an annular space is formed between the protective cylinder and the body part; a pressure differential sleeve disposed within the annular space; in the first state, the differential pressure sleeve is fixedly connected with the body part through a shear pin and blocks the fracturing hole, in the second state, the blanking plug and the differential pressure sleeve are completely degraded under the environment of reaching the preset bottom hole temperature, and the differential pressure sleeve is enabled to shear the shear pin under the action of the differential pressure and descend through pressurizing the inside of a well completion pipe column, so that the fracturing hole is opened.
Description
Technical Field
The invention belongs to the technical field of petroleum well completion, and particularly relates to a toe end well cementation fracturing sliding sleeve.
Background
In the oil and gas exploitation process, fracturing operation is an effective production increasing method, and particularly, a horizontal well layered modification technology becomes an important means for increasing the production of unconventional low-permeability oil and gas reservoirs.
At present, the toe end fracturing sliding sleeve is mainly applied to the tail end of a preset well completion pipe column of a casing and is responsible for first-section fracturing, and the sliding sleeve can be directly opened to perform fracturing operation without perforation operation, so that the operation efficiency is improved, and the operation cost is saved. Therefore, toe fracturing sleeves are widely used. However, because the toe end fracturing sliding sleeve is mainly applied to well cementing and completion operations, after well cementing, the fracturing hole is easily blocked by cement, so that the stratum is difficult to fracture after the sliding sleeve is opened, and the construction pressure is high. And, because toe end sliding sleeve is at the very tail end of well completion tubular column, the back is accomplished in the well cementation operation, and the inside cement stopper that easily remains of sliding sleeve even later stage is drilled the brill and is removed the cement stopper, also can be very big to the normal open influence of sliding sleeve, causes the sliding sleeve to open smoothly or open pressure too high. In addition, toe end sliding sleeve most designs to the pressure differential mode of opening, when suppressing pressure to certain pressure in the pipe promptly, alright cut the shear pin and open the sliding sleeve, and during the well cementation operation, when intraductal construction pressure can't effective control, there is the condition of opening the sliding sleeve in advance, and if the shear pressure design with the sliding sleeve shear pin is too high, during also can causing the fracturing operation, the sliding sleeve opening pressure is too high, even unable normal opening.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide the toe end well cementation fracturing sliding sleeve which can prevent cement from being filled in a fracturing hole, so that a cement-free space is formed at the fracturing hole, the thickness of a cement ring outside the sliding sleeve is favorably reduced, and the influence of the cement outside the sliding sleeve on the stratum fracture pressure is reduced. And this toe end well cementation fracturing sliding sleeve can prevent that cement from entering into inside each part of sliding sleeve, is favorable to guaranteeing the normal of sliding sleeve and opens. In addition, can effectively prevent when the well cementation operation, because intraductal pressure fluctuation, the sliding sleeve that causes opens in advance, be favorable to ensureing the fail safe nature of construction operation.
To this end, according to the present invention there is provided a toe end cementing fracturing sliding sleeve comprising: a cylindrical body portion provided with a plurality of fracturing holes in each of which a plug is fixedly mounted, respectively; a protective cylinder fixedly sleeved in the body part, wherein an annular space is formed between the protective cylinder and the body part; a pressure differential sleeve disposed within the annular space; in the first state, the differential pressure sleeve is fixedly connected with the body part through a shear pin and blocks the fracturing hole, in the second state, the blanking plug and the differential pressure sleeve are completely degraded when the preset bottom hole temperature environment is reached, and the differential pressure sleeve is enabled to shear the shear pin and descend under the action of the differential pressure through pressurizing the inside of the well completion pipe column, so that the fracturing hole is opened.
In one embodiment, the inner wall of the body part is provided with a first shoulder facing upwards, the outer wall of the shielding cylinder is provided with a first step facing upwards, and in the first state, the lower end face of the shielding cylinder abuts against the first shoulder and the lower end face of the differential pressure sleeve abuts against the first step, so that the shielding cylinder is axially fixed.
In one embodiment, the differential pressure jacket comprises a first portion and a second portion connected to a lower end of the first portion, the first portion having an outer diameter greater than an outer diameter of the second portion such that a second step is formed on an outer wall of the differential pressure jacket, the second step facing downward, and a second shoulder is further formed on an inner wall of the body portion, the second step facing upward, the second step being opposite the second shoulder in a first state, and the differential pressure jacket being axially movable downward to abut the second step against the second shoulder in a second state.
In one embodiment, a clamp spring is arranged on the outer wall surface of the first part of the differential pressure sleeve, a clamp spring groove is arranged on the inner wall of the body part, and in the second state, the clamp spring can be matched with the clamp spring groove after the differential pressure sleeve moves to open the fracturing hole, so that the differential pressure sleeve is locked.
In one embodiment, the circlip groove is provided at the second shoulder.
In one embodiment, the second portion of the differential pressure jacket extends axially downwardly between the body portion and the protective sleeve with a first seal disposed between the second portion and the body portion.
In one embodiment, the blanking plug is configured to include a mounting portion and a head portion connected to the mounting portion, the head portion having a diameter greater than a diameter of the mounting portion, the mounting portion being fixedly mounted in the fracturing bore, the head portion being radially outward of the body portion so as to enable a cement free space to be formed at the fracturing bore in the second state.
In one embodiment, a second sealing element is provided between the differential pressure sleeve and the body part on both axial sides of the stopper.
In one embodiment, an upper connector for connecting an upper pipe string is fixedly connected to an upper end of the body portion, and a lower end portion of the upper connector extends between the body portion and the protective sleeve.
In one embodiment, the lower end of the body portion is configured for connection to a lower sub of a lower tubular string.
Compared with the prior art, the application has the advantages that:
the toe end fracturing sliding sleeve can remarkably improve the fracturing success rate of the first section of an unconventional oil and gas reservoir, greatly improves the opening success rate of the sliding sleeve, reduces the influence of cement on the formation fracturing pressure, and ensures the smooth implementation of the first section of fracturing construction. This toe end fracturing sliding sleeve adopts blanking plug and a protection section of thick bamboo that degradable material made, through assembling the blanking plug in fracturing hole, can prevent effectively that the outside cement of sliding sleeve from entering into fracturing hole at the well cementation operation in-process, and can form certain no cement space near fracturing hole after the later stage degradation, reduce fracturing hole department cement ring thickness by a wide margin, thereby can reduce the outside cement of sliding sleeve to the influence of stratum rupture pressure, can show the fracturing success rate that improves the place interval. The protective cylinder is arranged in the toe end fracturing sliding sleeve, the lower part descending space of the differential pressure sleeve is completely filled, the differential pressure sleeve can be effectively fixed, the shear nail is prevented from being cut off due to overhigh construction pressure in the pipe, and therefore the sliding sleeve caused by pressure fluctuation in the pipe can be prevented from being opened in advance during well cementation operation. And, all wrap up toe end fracturing sliding sleeve inner part, grout gets into when effectively preventing the cementing operation, and a protection section of thick bamboo can degrade in the later stage, even because cementing operation replaces the plug to become invalid and causes the inside cement that is totally of sliding sleeve, also can guarantee to form effective isolation between sliding sleeve internal surface and cement, and then ensures opening reliability of sliding sleeve.
Drawings
The present invention will be described below with reference to the accompanying drawings.
Figure 1 shows the structure of a toe-end cementing fracturing sliding sleeve according to the present invention.
Figure 2 shows the degraded structure of the blanking plug and the protective sleeve of the toe-end cementing fracturing sliding sleeve shown in figure 1.
Figure 3 shows the structure of figure 1 with the toe-end cementing fracturing sliding sleeve in an open state.
In the present application, the drawings are all schematic and are used only for illustrating the principles of the invention and are not drawn to scale.
Detailed Description
The invention is described below with reference to the accompanying drawings.
In this application, it is noted that the end of the toe cementing fracturing sliding sleeve according to the present invention lowered into the wellbore near the wellhead is defined as the upper end or similar term, and the end away from the wellhead is defined as the lower end or similar term.
Figure 1 shows the structure of a toe-cementing fracturing sliding sleeve 100 according to the present invention. As shown in fig. 1, the toe-end cementing fracturing sliding sleeve 100 includes a cylindrical body portion 2, a shield cylinder 7 concentrically disposed within the body portion 2, and a differential pressure sleeve 6 disposed between the body portion 2 and the shield cylinder 7. A plurality of fracturing holes 21 are provided through the side wall in the body portion 2. In the embodiment shown in fig. 1, two layers of a plurality of axially spaced apart fracturing holes 21 are provided in the sidewall region near the upper end of the body portion 2, the plurality of fracturing holes 21 in each layer being evenly distributed in the circumferential direction. The plug 3 is fixedly attached to each of the fracturing holes 21. Wherein the plug 3 and the protective cylinder 7 can be completely degraded when a predetermined bottom hole temperature is reached.
In one embodiment, the plug 3 and the protective sleeve 7 are made of degradable material with certain strength and temperature sensitivity, such as PGA material. This material can degrade completely to a gas or liquid at a certain downhole temperature.
According to one embodiment of the invention, the pressure differential sleeve 6 is fixedly connected to the side wall of the body part 2 by means of the shear pin 4 and closes off the fracture opening 21. At this point, the fracturing bore 21 is closed and the toe end cementing fracturing sliding sleeve 100 is in the first state. In the first state, cement slurry is injected through the wellhead, and well cementation operation construction can be carried out. After the well cementation operation is finished, the blanking plug 3 and the protective barrel 7 can be completely degraded under the action of the underground environment, the pressure difference sleeve 6 can shear the shear pin 4 under the action of the pressure difference and then move downwards through pressurization in the well completion pipe column, so that the fracturing hole 21 is exposed to open the fracturing hole 21, and the fracturing hole 21 can be ensured to be always in an open state. At this time, the toe end cementing fracturing sliding sleeve 100 is in the second state. In the second condition, a fracturing operation may be performed on the corresponding interval.
In order to ensure the sealing of the fracture hole 21 in the first state, a plurality of second seals 9 are provided between the differential pressure sleeve 6 and the body part 2, the plurality of second seals 9 being on both axial sides of the stopper 3. For example, two second seals 9 are provided, the two second seals 9 being circumferentially spaced apart at the upper and lower end positions of the stopper 3, so that the fracturing bore 21 is between the two second seals 9.
According to the present invention, the plug 3 is configured to include a mounting portion and a head portion connected to the mounting portion, the head portion having a diameter larger than that of the mounting portion. The mounting portion is fixedly mounted in the fracturing bore 21 with the head portion radially outward of the body portion 2. In the first state, the mounting portion of the packer 3 is preferably mounted on the fracturing holes 21 by screw threads, and all the fracturing holes 21 of the toe-end cementing fracturing sliding sleeve 100 are completely blocked. When carrying out the well cementation operation (promptly, under the first state), stopper 3 can prevent that the outside cement of sliding sleeve from entering into fracturing downthehole, and later stage stopper 3 degradation back (promptly, under the second state), can form certain no cement space near fracturing hole 21, this reduces fracturing hole 21 department cement ring thickness by a wide margin, reduces the influence of cement to the stratum cracking pressure, is favorable to improving the fracturing success rate of toe end well cementation fracturing sliding sleeve 100 place interval very much.
As shown in fig. 1, an upper joint is fixedly connected to the upper end of the body portion 2. The upper joint 1 is used for connecting an upper pipe string (not shown). In one embodiment, the upper joint 1 is fixedly connected to the body portion 2 by means of a screw connection. In order to ensure the tightness between the upper joint 1 and the body part 2, a seal is provided between the connection faces of the upper joint 1 and the body part 2. In addition, the lower end of the body portion 2 is configured for connection to a lower sub 24 of a lower tubular string. The upper joint 1 and the lower joint 24 are simple in structure and convenient to install, and can effectively guarantee stable connection and sealing.
As shown in fig. 1, the shield cylinder 7 is fitted inside the body portion 2. A first shoulder 22 is provided on the inner wall of the body part 2, facing upwards. Preferably, the first shoulder 22 is disposed proximate the lower tab 24. Meanwhile, the outer wall surface of the protective cylinder 7 is provided with a first step 72 with an upward end surface, and in the first state, the lower end surface of the protective cylinder 7 abuts against the first shoulder 22, and the lower end surface of the differential pressure sleeve 6 abuts against the first step 72. The protective sleeve 7 is thus axially fixed by the first shoulder 22 and the lower end face of the differential pressure sleeve 6. Thereby, the shield cylinder 7 is fitted to the inside of the body portion 2, so that the lower descending space of the differential pressure jacket 6 is filled entirely. On the one hand, the protective cylinder 7 can effectively fix the differential pressure sleeve 6, and effectively prevent the shear pin 4 from being sheared due to overhigh construction pressure in the pipe column and the fracturing hole 21 from being opened in advance. On the other hand, the protective barrel 7 completely wraps the toe end well cementation fracturing sliding sleeve 100, so that cement slurry can be prevented from entering during well cementation operation, and therefore, the cement is effectively prevented from being accumulated in the space at the position during the well cementation operation. In addition, the protective cylinder 7 can be completely degraded in the later period, and even if the inside of the sliding sleeve is completely cement due to failure of the rubber plug in the well cementation operation, effective isolation can be formed between the inner surface of the differential pressure sleeve 6 and the cement, so that the opening reliability of the toe end well cementation fracturing sliding sleeve 100 is ensured.
As shown in FIG. 1, in one embodiment, the pressure differential jacket 6 is configured to include a first portion 61 and a second portion 62 connected to a lower end of the first portion 61. The outer diameter of the first portion 61 is greater than the outer diameter of the second portion 62, thereby forming a second step 63 facing downward on the outer wall of the differential pressure jacket 6 at the junction of the first portion 61 and the second portion 62. At the same time, a second shoulder 23 is provided on the inner wall of the body part 2, facing upwards. In the first state, the second step 62 is opposed to the second shoulder 23. In the second state, the differential pressure jacket 6 can move axially downward to abut the second step 62 against the second shoulder 23, thereby forming an axially downward stop for the differential pressure jacket 6 to prevent the differential pressure jacket 6 from falling.
According to one embodiment of the invention, a circlip 5 is provided between the pressure differential sleeve 6 and the body part 2. For example, the clamp spring 5 may be provided on the outer wall surface of the first portion of the differential pressure sleeve 6, and the clamp spring groove 51 may be provided on the inner wall of the body portion 2. The snap spring 5 can be fittingly snapped into the snap spring groove 51. In the second state, the snap spring 5 can be matched with the snap spring groove 51 after the differential pressure sleeve 6 moves to open the fracturing hole 21, so that the differential pressure sleeve 6 is locked. The circlip groove 51 is preferably provided at the second shoulder 23, and the end surface of the second shoulder 23 is formed as the lower side wall surface of the circlip groove 51. Through the cooperation of jump ring 5 and jump ring groove 51, can effectively avoid differential pressure cover 6 to roll back when carrying out fracturing operation to keep fracturing hole 21 open all the time, with the normal clear of ensureing fracturing operation.
According to the invention, as shown in fig. 1, in the first state, the second portion 62 of the differential pressure jacket 6 extends axially downwardly between the body portion 2 and the shield cylinder 7. In order to avoid that cement in the second state enters the lowerable space of the lower part of the pressure differential jacket 6, a first seal 8 is provided between the second part 62 and the body part 2. This can effectively guarantee that differential pressure cover 6 descends smoothly, has guaranteed that toe end well cementation fracturing sliding sleeve 100 can normally open.
The operation of the toe-cementing fracturing sleeve 100 according to the present invention is briefly described below.
Firstly, the toe end fracturing sliding sleeve 100 is lowered to a preset position in the well along with the prefabricated well completion pipe string, then, cement slurry is injected from the well mouth, and well cementation operation is started. During the cementing operation, as shown in fig. 1, the plug 3 and the protective cylinder 7 are not degraded, and the differential pressure sleeve 6 is fixed at an axial position corresponding to the fracturing hole 21 by the shear pin 4, thereby plugging the fracturing hole 21. At this time, the fracturing holes 21 of the toe fracturing sliding sleeve 100 are closed, and are in the first state.
After the well cementation operation is finished, cement slurry is arranged outside the toe end fracturing sliding sleeve 100, and slurry is arranged inside the toe end fracturing sliding sleeve. After the cement is solidified, the blanking plug 3 and the protective cylinder 7 of the toe-end fracturing sliding sleeve begin to degrade under the temperature environment of the well bottom, and gradually degrade into gas and liquid until the blanking plug 3 and the protective cylinder 7 are completely degraded. As shown in fig. 2, after the blanking plug 3 and the protective cylinder 7 are completely degraded, the fracturing hole 21 is a clean cement-free space, and the axial lower part of the differential pressure sleeve 6 is exposed to a clean downward space.
And then, carrying out fracturing operation, pressurizing the interior of the well completion pipe string, shearing the shear pin 4 by the differential pressure sleeve 6 under the action of differential pressure when certain pressure is reached, and descending the differential pressure sleeve 6 until the snap spring 5 is matched and clamped into the snap spring groove 51, so that the fracturing hole 8 is completely opened, and the differential pressure sleeve 6 is axially locked. The pressure difference sleeve 6 can prevent from backing under the action of the clamp spring 5 and the clamp spring groove 51, so that the fracturing hole 21 is always in an open state. Thereby, the fracturing operation of the interval can be initiated. It should be understood here that a gap is left between the upper end face of the differential pressure jacket 6 and the lower end face of the upper joint 1, and a differential pressure is formed between the upper and lower end faces of the differential pressure jacket 6 because the area of the upper end face of the differential pressure jacket 6 is larger than that of the lower end face.
The toe end fracturing sliding sleeve 100 can remarkably improve the fracturing success rate of the first section of an unconventional oil and gas reservoir, greatly improve the opening success rate of the sliding sleeve, reduce the influence of cement on the formation fracturing pressure and ensure the smooth implementation of the first section fracturing construction. This toe end fracturing sliding sleeve 100 adopts blanking plug 3 and a protection section of thick bamboo 7 that degradable material made, through assembling blanking plug 3 in fracturing hole 21, can prevent effectively that the outside cement of sliding sleeve from entering into fracturing hole 21 at the well cementation operation in-process, and can form certain no cement space near fracturing hole 21 after the later stage degradation, reduce fracturing hole department cement ring thickness by a wide margin, thereby can reduce the outside cement of sliding sleeve to the influence of stratum rupture pressure, can show the fracturing success rate that improves place interval. The protective sleeve 7 is arranged in the toe end fracturing sliding sleeve 100, the lower descending space of the differential pressure sleeve is completely filled, the differential pressure sleeve can be effectively fixed, the shear nail 4 is prevented from being cut off due to overhigh construction pressure in the pipe, and therefore the sliding sleeve can be prevented from being opened in advance due to pressure fluctuation in the pipe during well cementation operation. Moreover, the toe end fracturing sliding sleeve 100 is completely wrapped, cement slurry is effectively prevented from entering during well cementation operation, the protective cylinder 7 can be degraded in the later period, and even if the inside of the sliding sleeve is completely cement due to failure of a rubber plug in well cementation operation, effective isolation can be formed between the inner surface of the sliding sleeve and the cement, and therefore the opening reliability of the sliding sleeve is ensured.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and do not limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing examples, or that equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A toe end cementing fracturing sleeve comprising:
a cylindrical body portion (2) provided with a plurality of fracturing holes (21) in each of which a plug (3) is fixedly mounted, respectively;
a protective cylinder (7) concentrically arranged inside the body part, an annular space (71) being formed between the protective cylinder and the body part;
a pressure differential sleeve (6) disposed within the annular space;
wherein, in the first state, the differential pressure sleeve is fixedly connected with the body part through a shear pin (4) and blocks the fracturing hole,
and in a second state, the blanking plug and the differential pressure sleeve are completely degraded under the environment of reaching the preset bottom hole temperature, and the differential pressure sleeve is enabled to shear the shear pin and descend under the action of the differential pressure by pressurizing the inside of the well completion pipe string, so that the fracturing hole is opened.
2. The toe end cementing fracturing sliding sleeve of claim 1, wherein the inner wall of the body portion is provided with a first shoulder (22) facing upward, the outer wall of the protective sleeve is provided with a first step (72) facing upward,
in a first state, the lower end face of the protective cylinder abuts against the first shoulder, and the lower end face of the differential pressure sleeve abuts against the first step, so that the protective cylinder is axially fixed.
3. The toe-end cementing fracturing sliding sleeve according to claim 1 or 2, wherein the differential pressure sleeve comprises a first part (61) and a second part (62) connected to the lower end of the first part, the outer diameter of the first part is larger than that of the second part, so that a second step (63) facing downwards is formed on the outer wall of the differential pressure sleeve, and a second shoulder (23) facing upwards is further provided on the inner wall of the body part,
in a first state, the second step is opposite the second shoulder,
in a second state, the pressure differential sleeve is able to move axially downward to cause the second step to abut against the second shoulder.
4. The toe end cementing and fracturing sliding sleeve according to claim 3, wherein a snap spring (5) is arranged on the outer wall surface of the first part of the differential pressure sleeve, a snap spring groove (51) is arranged on the inner wall of the body part,
in a second state, the clamp spring can be matched with the clamp spring groove after the pressure difference sleeve moves to open the fracturing hole, so that the pressure difference sleeve is locked.
5. The toe-end cementing fracturing sliding sleeve according to claim 4, wherein the circlip groove is provided at the second shoulder.
6. The toe-end cementing fracturing sliding sleeve according to claim 3, wherein a second part of the differential pressure sleeve extends axially lower to between the body part and the protective sleeve, and a first seal (8) is provided between the second part and the body part.
7. The toe end cementing fracturing sliding sleeve of claim 1, wherein the blanking plug is configured to comprise a mounting portion and a head portion connected with the mounting portion, the head portion having a diameter greater than a diameter of the mounting portion,
the mounting portion is fixedly mounted in the fracturing hole, and the head portion is located radially outside the body portion, so that a cement-free space can be formed at the fracturing hole in the second state.
8. The toe-end cementing fracturing sliding sleeve according to claim 1 or 7, characterized in that a second seal (9) is provided between the differential pressure sleeve and the body part and on both axial sides of the stopper, respectively.
9. The toe-end cementing fracturing sliding sleeve according to claim 1, wherein an upper joint (1) for connecting an upper pipe string is fixedly connected to the upper end of the body part, and the lower end part of the upper joint extends between the body part and the protective sleeve.
10. The toe-end cementing fracturing sliding sleeve of claim 1, wherein the lower end of the body portion is configured for connection to a lower joint (24) of a lower tubular string.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110465111.XA CN115247546B (en) | 2021-04-28 | 2021-04-28 | Toe end well fracturing sliding sleeve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110465111.XA CN115247546B (en) | 2021-04-28 | 2021-04-28 | Toe end well fracturing sliding sleeve |
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| CN115247546A true CN115247546A (en) | 2022-10-28 |
| CN115247546B CN115247546B (en) | 2024-04-26 |
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| CN212428776U (en) * | 2020-08-03 | 2021-01-29 | 中国石油天然气集团有限公司 | Toe end sliding sleeve and oil well tubular column thereof |
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2021
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| CN109973066A (en) * | 2017-12-28 | 2019-07-05 | 中石化石油工程技术服务有限公司 | A kind of full-bore well cementation fracturing device |
| CN112211592A (en) * | 2019-07-12 | 2021-01-12 | 中国石油化工股份有限公司 | Switchable well cementation sliding sleeve |
| CN212428776U (en) * | 2020-08-03 | 2021-01-29 | 中国石油天然气集团有限公司 | Toe end sliding sleeve and oil well tubular column thereof |
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| CN115247546B (en) | 2024-04-26 |
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