CN114439445A - Sand prevention sliding sleeve - Google Patents
Sand prevention sliding sleeve Download PDFInfo
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- CN114439445A CN114439445A CN202011227284.XA CN202011227284A CN114439445A CN 114439445 A CN114439445 A CN 114439445A CN 202011227284 A CN202011227284 A CN 202011227284A CN 114439445 A CN114439445 A CN 114439445A
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- sliding sleeve
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- 239000004576 sand Substances 0.000 title claims abstract description 128
- 230000002265 prevention Effects 0.000 title description 18
- 230000007246 mechanism Effects 0.000 claims description 33
- 239000007788 liquid Substances 0.000 claims description 23
- 230000009471 action Effects 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 description 18
- 238000004519 manufacturing process Methods 0.000 description 17
- 238000007789 sealing Methods 0.000 description 16
- 239000012530 fluid Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002343 natural gas well Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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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
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
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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)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides a sand-proof sliding sleeve, which comprises: the side wall of the outer barrel is provided with a flow guide hole; and an inner barrel concentrically mounted within the outer barrel, the inner barrel including a first portion configured with a sand control passage and a second portion connected to the first portion; wherein, in a first state, the body of the second part of the inner cylinder blocks the diversion hole to make the outer space of the outer cylinder and the inner space of the inner cylinder not communicated, in a second state, the first part and the second part move downwards relative to the outer cylinder to make the diversion hole staggered with the first part and the second part so as to directly communicate the outer space of the outer cylinder and the inner space of the inner cylinder through the diversion hole, and in a third state, the first part of the inner cylinder moves upwards to make the sand control passage and the diversion hole communicate oppositely, so that the outer space of the outer cylinder and the inner space of the inner cylinder are communicated through the sand control passage.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas well completion, in particular to a sand-prevention sliding sleeve.
Background
The open hole staged fracturing well completion process is a common means for efficient development of compact oil and gas reservoirs, and compared with casing staged fracturing well completion, the open hole staged fracturing well completion process has the advantages that the contact area of a production zone and an oil and gas production channel is larger, and oil and gas seepage channels are more. The conventional staged fracturing technology adopts a sliding sleeve and a packer to perform staged fracturing, and the staged fracturing technology is a well completion mode with high efficiency and low production cost. However, the conventional sliding sleeve does not have a sand prevention function, so that in the open hole staged fracturing well completion process, the risk of formation sand production or well wall collapse is easy to occur in the oil and gas production process after the fracturing is finished, and even a large amount of sand or collapsed materials can enter a shaft, thereby causing great difficulty in later oil and gas well management and maintenance. Therefore, the sand prevention function of the sliding sleeve is particularly important.
Therefore, it is desirable to provide a sliding sleeve with sand control function.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide a sand-prevention sliding sleeve which can be used on an open hole staged fracturing well completion pipe column and can effectively prevent solid matters produced by the formation and collapsed on the well wall from entering the sliding sleeve and a shaft in the exploitation process, thereby ensuring the production quality.
To this end, according to the present invention, a sand control sliding sleeve is proposed, comprising: the side wall of the outer barrel is provided with a flow guide hole; and an inner barrel concentrically mounted within the outer barrel, the inner barrel including a first portion configured with a sand control passage and a second portion connected to the first portion; wherein, in a first state, the body of the second part of the inner cylinder blocks the diversion hole to make the outer space of the outer cylinder and the inner space of the inner cylinder not communicated, in a second state, the first part and the second part move downwards relative to the outer cylinder to make the diversion hole staggered with the first part and the second part so as to directly communicate the outer space of the outer cylinder and the inner space of the inner cylinder through the diversion hole, and in a third state, the first part of the inner cylinder moves upwards to make the sand control passage and the diversion hole communicate oppositely, so that the outer space of the outer cylinder and the inner space of the inner cylinder are communicated through the sand control passage.
In one embodiment, the first part is nested between the second part and the outer barrel, in a first state and a second state the first part is in fixed connection with the second part by a first pin, and in a third state the first pin is disabled and the first part moves upwardly relative to the outer barrel independently of the second part.
In one embodiment, the second portion is provided with a liquid inlet hole penetrating through the side wall, a liquid inlet gap is formed between the inner cylinder and the outer cylinder,
in a third state, the liquid in the well flows to the first pin through the liquid inlet hole and the liquid inlet gap, and the first pin can be dissolved to fail under the action of the liquid in the well.
In one embodiment, in the first state, the inner cylinder and the outer cylinder form a fixed connection through the second pin, the sand control channel of the first part is opposite to the flow guide hole of the outer cylinder, and the sand control channel and the flow guide hole are simultaneously blocked by the main body of the second part.
In one embodiment, a first step surface facing upward is configured at an inner side of the outer cylinder, the first step surface is located below the first portion and opposite to the first portion, an elastic member is provided between the first portion and the first step surface,
in the second state, the first part shears the second pin to move downwards so as to compress the elastic piece,
in a third state, the elastic member drives the first part to move upwards.
In one embodiment, a mounting groove is formed in an outer wall of the second part, a locking mechanism is mounted in the mounting groove, an annular groove is formed in an inner wall of the outer barrel, the second part moves downwards relative to the outer barrel in a second state until the locking mechanism is opposite to the annular groove and is embedded into the annular groove, and the second part and the outer barrel are kept relatively fixed under the action of the locking mechanism in a third state.
In one embodiment, the first section is coupled to the second section such that in the first state the sand control passage of the first section is opposite the body of the outer barrel above the flow directing apertures.
In one embodiment, a lower joint is fixedly connected to the lower end of the outer cylinder, the upper end of the lower joint is inserted into the outer cylinder, an elastic member is installed between the lower end surface of the second part and the upper end surface of the lower joint, in the second state, the first part and the second part move downwards to compress the elastic member, and in the third state, the elastic member drives the second part to move upwards to enable the sand control channel of the first part to be communicated with the flow guide hole of the outer cylinder.
In one embodiment, a mounting groove is formed on an outer wall of the second portion, a limiting mechanism is mounted in the mounting groove, a limiting groove is formed on an inner wall surface of the outer cylinder, in a first state, the limiting mechanism is located above the limiting groove, in a second state, the second portion moves downwards relative to the outer cylinder until the limiting mechanism is engaged in the limiting groove and moves to a lower end of the limiting groove, and in a third state, the second portion moves upwards relative to the outer cylinder until the limiting mechanism moves to an upper end of the limiting groove and is clamped at an upper end of the limiting groove.
In one embodiment, a radially outwardly extending switch slot is provided on an inner wall of the second portion, and the sliding sleeve opening tool can cooperate with the switch slot to drive the first portion and the second portion to move downward relative to the outer barrel.
Compared with the prior art, the invention has the following advantages:
the sand control sliding sleeve can realize fracturing construction and sand control through one string, integrates multiple functions of fracturing construction, sand control and the like, greatly simplifies construction operation steps, and obviously improves the construction and production operation efficiency. And the sand prevention performance of the sand prevention sliding sleeve is obviously enhanced through the sand prevention component, so that the sand prevention sliding sleeve can effectively prevent solid matters produced by the stratum and collapsed on the well wall from entering the inner tube of the tubular column, the normal operation of production operation is ensured, and the sand prevention effect and the reliability of the sand prevention sliding sleeve are further improved. The sand-prevention sliding sleeve can be used on an open hole staged fracturing well completion pipe column, and can effectively prevent solid matters produced by sand in the stratum and collapsed on the well wall from entering the sliding sleeve and a shaft in the exploitation process, so that the production quality is ensured. In addition, the sand prevention sliding sleeve is simple in structure, convenient to operate and low in cost.
Drawings
The invention will now be described with reference to the accompanying drawings.
Fig. 1 shows a first state of a sand control sliding sleeve according to a first embodiment of the invention.
FIG. 2 illustrates a second condition of the sand control sliding sleeve according to the present invention.
FIG. 3 illustrates a third state of the sand control sliding sleeve according to the present invention.
Fig. 4 is an enlarged view of the area a in fig. 2.
FIG. 5 illustrates a first state of a sand control sliding sleeve according to a second embodiment of the present invention.
Fig. 6 shows a second state of the sand control sliding sleeve of the second embodiment.
Fig. 7 shows a third state of the sand control sliding sleeve of the second embodiment.
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 should be noted that, the end of putting the sand control sliding sleeve into the pit shaft and being close to the well head is defined as the upper end or similar expression, and the end of keeping away from the face well head is defined as the lower extreme or similar expression.
Fig. 1 shows the structure of a sand control sliding sleeve 100 according to the present invention. As shown in fig. 1, the sand control sliding sleeve 100 includes an outer cylinder 110, and the outer cylinder 110 is configured in a cylindrical shape. An upper joint 101 and a lower joint 102 are fixedly mounted to both ends of the outer cylinder 110, respectively. The upper and lower joints 101 and 102 are used to connect a downhole string, respectively, to connect the sand control sliding sleeve 100 into the downhole string and to be constructed downhole with the downhole string. In one embodiment, the upper and lower joints 101 and 102 are each provided with a stepped coupling button having an external thread, and, at the same time, an internal thread is provided at both ends of the inner wall of the outer tub 110. The outer cylinder 110 is fixedly mounted to the upper joint 101 and the lower joint 102 by screwing. The connection mode of the sand control sliding sleeve 100 is convenient to install, stable and reliable.
In order to ensure the sealing property between the outer cylinder 110 and the upper joint 101 and the lower joint 102, a seal is provided between the connection surfaces of the outer cylinder 110 and the upper joint 101 and the lower joint 102. In one embodiment, the seal is a gasket. Therefore, the sealing performance of the joints of the outer cylinder 110 and the upper joint 101 and the lower joint 102 can be effectively ensured, and the sealing performance of the sand control sliding sleeve 100 can be ensured.
According to the present invention, a plurality of baffle holes 111 are provided on the sidewall of the outer tub 110. As shown in fig. 1, the baffle hole 111 is provided on a sidewall of the outer cylinder 110 near an upper end (left end in fig. 1). The plurality of guide holes 111 are disposed at the same axial position and are uniformly spaced apart in the circumferential direction. The diversion holes 111 can be opened for the flow of well fluids therethrough for fracturing operations.
As shown in FIG. 1, the sand control sliding sleeve 100 further comprises an inner barrel 120. The inner cylinder 120 is concentrically installed inside the outer cylinder 110. The inner tube 120 includes a first portion 121 having a cylindrical shape and a second portion 122 connected to a lower end of the first portion 121, and a sand control passage 123 is formed on a sidewall of the first portion 121. In the first state (initial state), the second portion 122 of the inner cylinder 120 is fixedly connected to the outer cylinder 110 by the second pin 105, and the inner cylinder 120 blocks the diversion hole 111. In one embodiment, the second pin 105 is a shear pin. Sand control passage 123 may be configured as at least one of a sand control slot, a sand control hole, or a sand control mesh.
According to the present invention, an opening and closing groove 124 extending radially outward is provided on an inner wall surface of the inner cylinder 120. In operation, a sliding sleeve opening tool (not shown) can be adapted to the inner cylinder groove 124 to form a snap fit, so as to drive the inner cylinder 120 to move axially downward to open the diversion hole 111. In the actual working process, the sliding sleeve opening tool is thrown in from the wellhead to reach the inside of the sand-proof sliding sleeve and is matched with the switch groove 124 to form clamping, so that the sliding sleeve opening tool exerts downward acting force on the inner cylinder 120 until the second pin 105 is sheared off, the inner cylinder 120 descends, the diversion hole 111 is opened, and the outer space of the outer cylinder 110 is directly communicated with the inner space of the inner cylinder 120 through the diversion hole 111. At this time, the opened state of the pilot hole 111 is the second state, and the fracturing construction can be performed in this state.
According to the present invention, the sand control sliding sleeve 100 further includes an elastic member 130 disposed between the outer cylinder 110 and the inner cylinder 120. When the inner cylinder 120 descends, the elastic member 130 is axially moved downwards and compressed, and the elastic member 130 is configured to release the elastic force to push the first part 121 of the inner cylinder 120 to axially move upwards until the sand control passage on the first part 121 of the inner cylinder 120 faces the flow guide hole 111, so that the outer space of the outer cylinder 110 is communicated with the inner space of the inner cylinder 120 through the sand control passage 123. At this time, the guide holes 111 are opened through the sand control passage 123 to be in a third state, in which sand control production work can be performed.
The sand control sliding sleeve is described in detail below with respect to various embodiments.
The first embodiment is as follows:
as shown in fig. 1, the second portion 122 of the inner cylinder 120 is configured to include a first cylinder 1221 and a second cylinder 1222 fixedly coupled to a lower end of the first cylinder 1221. In one embodiment, the first cylinder 1221 and the second cylinder 1222 may be integrally formed by a threaded fastening connection. The first cylinder 1221 and the second cylinder 1222 have equal inner diameters, and the first cylinder 1221 has a smaller outer diameter than the second cylinder 1222. Thus, a step is formed on the outer wall surface of the second cylinder 1222. A shoulder 112 is provided on the inner wall surface of the outer cylinder 110. In the first state, the inner cylinder 120 is fixedly connected to the outer cylinder 110 by the second pin 105. In one embodiment, the second cylinder 1222 in the inner cylinder 120 is fixedly connected with the outer cylinder by the second pin 105, and the first cylinder 1221 is closed the diversion hole 111. At this time, the stepped end surface of the second cylinder 1222 of the inner cylinder 120 abuts against the lower end surface of the shoulder 112 of the outer cylinder 110, and the upper end surface of the inner cylinder 120 abuts against the lower end surface of the upper joint 101.
In the present embodiment, the lower end face of the upper joint 101 is provided with a cylindrical connecting portion extending axially outward. The cylindrical connection portion is provided with an outer diameter equal to the inner diameter of the outer cylinder 110 and an inner diameter smaller than the inner diameter of the upper joint 101 and equal to the outer diameter of the first cylinder 1221 of the inner cylinder 120. Thereby, a stepped mounting portion is formed at the end of the upper joint 101. In the first state, the upper end surface of the inner tube 120 abuts against the stepped mounting portion of the upper joint 101. Meanwhile, a sealing ring is provided between the cylindrical connection portion and the inner cylinder 120. This configuration of the upper joint 101 is very advantageous for sealing of the sand control sliding sleeve 100.
As shown in fig. 1, the first portion 121 of the inner cylinder 120 is fitted between the second portion 122 and the outer cylinder 110. In the first state, the first part 121 forms a fixed connection with the second part 122 via the first pin 104. Meanwhile, in this state, the inner cylinder 120 forms a fixed connection with the outer cylinder 110 by the second pins 105, and the main body of the second part 122 simultaneously blocks the sand control passage 123 and the flow guide holes 111. In the first state, the sand control passage 123 of the first section 121 faces the guide hole 111 of the outer cylinder 110, and the upper end surface of the inner cylinder 120 contacts the lower end surface of the upper joint 101. In order to ensure the sealing property between the first part 121 and the sidewall of the outer cylinder 110, a plurality of sealing members are provided between the first part 121 and the sidewall of the outer cylinder 110, and the sealing members are respectively provided at upper and lower sides of the sand control passage 123. In the present embodiment, the upper end surface of the shoulder 112 of the outer cylinder 110 is configured as a first step surface facing upward, the first step surface being located below the first part 121 and opposite to the first part 121, and the elastic member 130 is disposed between the first part 121 and the first step surface. Preferably, the elastic member 130 is a spring. In the first state, the elastic member 130 is in a free state, or may have been subjected to some compression, and both ends of the elastic member 130 abut against the lower end surface and the first step surface of the first part 121, respectively. In the second state, the inner cylinder 120 shears the second pin 105 and moves downward to compress the elastic member 130. In the third state, the first pin 104 is disabled, so that the first part 121 can be moved upward relative to the outer cylinder 110 independently of the second part 122 by the elastic member 130.
In the present embodiment, the inner cylinder 120 is provided with a liquid inlet hole 125 penetrating through a side wall, and preferably, the liquid inlet hole 125 is provided on the side wall of the first cylinder 1221 near the lower end, and a liquid inlet gap 126 is formed between the inner cylinder 120 and the outer cylinder 110, and the liquid inlet gap 126 can communicate with the liquid inlet hole 125 and extend to the first pin 104. Two axially spaced seals are provided between the second cylinder 1222 of the inner barrel 120 and the outer barrel 110, with the liquid inlet 125 being axially between the two seals. In the first state, under the action of the two sealing members, the liquid inlet hole 125 is not communicated with the liquid inlet gap 126, the liquid inlet gap 126 is in a sealing state, and the first pin 104 cannot be dissolved and failed. In the third state, after the inner cylinder 120 moves downward, an annular space is formed between the second cylinder 1222 and the outer cylinder 110, and two sealing members between the second cylinder 1222 and the outer cylinder 110 are in the annular space and do not perform a sealing function, and at this time, the liquid inlet hole 125 communicates with the liquid inlet gap 126. Thus, well fluid flows through the inlet aperture 125 and the inlet gap 126 to the first pin 104, and the first pin 104 is able to dissolve under the influence of the well fluid to fail.
According to the present invention, a mounting groove is provided on an outer wall of the second portion 122 of the inner cylinder 120, a locking mechanism 150 is mounted in the mounting groove, and an annular groove 113 is provided on an inner wall of the outer cylinder 110. In the second state, the second part 122 is moved downward relative to the outer cylinder 110 until the locking mechanism 150 is opposite to the annular groove 113 and is embedded in the annular groove 113, thereby forming an axial lock on the second part 122. Thereby, the pilot hole 111 can be maintained in an open state for fracturing work. Also, in the third state, the locking mechanism 150 keeps the second portion 122 relatively fixed with respect to the outer cylinder 110. In one embodiment, the locking mechanism 150 may be a circlip, a C-ring, or a retaining ratchet. In another embodiment, the locking mechanism 150 may employ a combination of springs and stops, for example. Initially, spring compression sets up between the diapire of dog and mounting groove for the dog is held in the mounting groove.
When the sand control sliding sleeve 100 is installed, first, the first part 121 and the elastic member 130 of the inner cylinder 120 are sleeved on the first cylinder 1221 of the second part 122, and the first part 121 and the first cylinder 1221 are fixedly connected by the first pin 104. Thereafter, the first part 121 is fitted into the outer cylinder 110 together with the first cylinder 1222, and the lower end of the elastic member 130 abuts against the first step surface in the outer cylinder 110. Thereafter, the upper joint 101 is screwed to the upper end of the outer cylinder 110. Thereafter, the locking mechanism 150 is installed in the installation groove on the outer wall of the second cylinder 1222 of the second portion 122, and then the second cylinder 1222 is loaded into the outer cylinder 110 from the lower end of the outer cylinder 110, and the second cylinder 1222 is fixedly connected to the first cylinder 1221 by means of screw threads. Thereafter, the outer cylinder 110 is fixedly coupled to the second portion 122 of the inner cylinder 120 by the second pin 105. Then, the lower joint 102 is fixedly connected with the lower end of the outer cylinder 110 by a thread, thereby completing the assembly of the sand control sliding sleeve 100.
The operation of the sand control sliding sleeve 100 is briefly described below. First, in the first state, as shown in fig. 1, the bodies of the first and second portions 121 and 122 of the inner cylinder 120 are located at the upper end portion of the outer cylinder 110, and close the diversion hole 111. The sand control sliding sleeve 100 is coupled into a construction string and then lowered into the wellbore until a predetermined construction formation is reached. Then, a sliding sleeve opening tool (not shown) is put in from the wellhead until the sliding sleeve opening tool reaches the sand control sliding sleeve 100 and is matched and clamped with the switch slot 124 in the inner barrel 120, and pressure is suppressed in the sand control sliding sleeve 100 to form downward pressure on the inner barrel 120, so that the second part 122 of the inner barrel 120 shears the second pin 105. The second portion 122 drives the first portion 121 to descend synchronously, so that the first portion 121 compresses the elastic member 130 until the diversion hole 111 is completely opened. At this time, the locking mechanism 150 is fittingly engaged with the annular groove 113 to lock the second portion 122, so that the pilot hole 111 is maintained in an open state. Thus, the outer space of the outer cylinder 110 and the inner space of the inner cylinder 120 are directly communicated through the guide holes 111. Fig. 2 shows a second state of the sand control sliding sleeve 100. At this time, the fracturing fluid in the sand control sliding sleeve 100 can be subjected to fracturing construction through the diversion holes 111.
After the fracturing construction is completed, as the fracturing fluid returns, the first pin 104 fixedly connecting the first part 121 and the second part 122 of the inner cylinder 120 is slowly dissolved under the action of the returning fluid. Therefore, the elastic member 130 can release the elastic force and drive the first part 121 to move upwards until the first part 121 reaches the initial position, and the sand control passage 123 faces the flow guide holes 111 on the outer cylinder 110, so that the outer space of the outer cylinder 110 is communicated with the inner space of the inner cylinder 120 through the sand control passage 123. FIG. 3 illustrates a third state of the sand control sliding sleeve 100. At this moment, the sand control sliding sleeve 100 is in a sand control state, and sand and gravel which collapse from the well wall can be effectively prevented from entering the inner tube of the tubular column through the sand control passage 123, so that a sand control function is realized, and the normal operation of production operation is ensured.
The sand control sliding sleeve 100 according to the embodiment has the advantages of simple structure, convenience in operation, simplification of construction steps, remarkable improvement of production operation efficiency, effective improvement of sand control performance and high reliability.
Example two:
fig. 5 shows the structure of a sand control sliding sleeve 200 according to a second embodiment of the invention. As shown in fig. 5, the inner cylinder 220 has a cylindrical shape, and the open-close groove 224 is preferably provided on an inner wall of the inner cylinder 220 near a middle region. The second embodiment is different from the first embodiment in the structure and the arrangement position of the first part 221 of the inner cylinder 220 and the arrangement position of the elastic member.
As shown in fig. 4, a first section 221 of the inner barrel 220 is coupled to an upper end of a second section 222, and the first section is provided with a sand control passage 223. Preferably, the first portion 221 and the second portion 222 are integrally provided. In the first state, the second section 222 forms a fixed connection with the outer cylinder 210 by the shear pins 205 and makes the sand control passage 223 opposite to the main body of the outer cylinder 210 above the guide holes 211, thereby blocking the guide holes 211. In the sand control state, the sand control passage 223 can correspond to the guide holes 211 to perform sand control. In order to ensure the sealing of the second portion 222 of the inner cylinder 220 to the guide hole 211, a plurality of sealing members are disposed between the second portion 222 and the sidewall of the outer cylinder 210, the sealing members are spaced apart, and the sealing members are respectively disposed at upper and lower sides of the guide hole 211 in an initial state.
In the second embodiment, an inner cylinder connection sleeve 260 is fixedly connected to the lower end of the second portion 222 of the inner cylinder 220. The inner cylinder connecting sleeve 260 and the second part 222 are fixedly connected in a threaded manner. The outer diameter of the inner cylinder connection sleeve 260 is smaller than the inner diameter of the second portion 222 and is set equal to the inner diameter of the lower joint 202, and the inner cylinder connection sleeve 260 extends into the lower joint 202 and receives a guide on the inner wall surface of the lower joint 202. Thus, a closed annular cavity is formed between the inner cylinder connection sleeve 260 and the outer cylinder 210 between the lower end face of the second portion 222 and the upper end face of the lower joint 202. The elastic member 230 is sleeved on the outer wall surface of the inner cylinder connecting sleeve 260 and is installed in the annular cavity. In the first state, the elastic member 230 is in a free state, and the lower end surface of the second portion 222 is spaced apart from the upper end of the elastic member 230. The second portion 222 of the inner barrel 220 is capable of driving the inner barrel connecting sleeve 260 downward and compressing the elastic member 230 after shearing the shear pin 205 until the diversion hole 211 is completely opened.
In the present embodiment, a limit step 212 is provided on a sidewall region of the outer cylinder 210 corresponding to the annular cavity. The limiting step 212 is used for axially limiting the downward movement of the inner cylinder 220, so that the inner cylinder 220 can move downward until the lower end surface is just abutted against the limiting step 212, and the diversion hole 211 can be completely opened. The retention step 212 also prevents the inner barrel 220 from over compressing the resilient member 230, thereby preventing failure of the resilient member 230.
According to the present invention, a mounting groove is provided on an outer wall of the second part 222, a stopper mechanism 250 is mounted in the mounting groove, and a stopper groove 213 is provided on an inner wall of the outer tub 210. The limit groove 213 can axially limit the limit mechanism 250, so that the inner cylinder 220 can move in a certain axial range through the limit mechanism 250 and the limit groove 213. In one embodiment, the spacing mechanism 250 employs spacing ratchet teeth. It is understood that the limiting mechanism 250 may be a snap spring or a C-ring. In the first state, the stopper mechanism 250 is located above the stopper groove 213. In the second state, the second portion 222 moves downward relative to the outer cylinder 210 until the stopper mechanism 250 engages into the stopper groove 213 and moves to the lower end of the stopper groove 213. In the third state, the second portion 222 moves upward relative to the outer cylinder 210 until the position-limiting mechanism 250 moves to the upper end of the position-limiting groove 213 and is caught at the upper end of the position-limiting groove 213.
When the sand control sliding sleeve 200 is installed, first, the limiting mechanism 250 is installed in the installation groove of the second part 222 of the inner cylinder 220, and the inner cylinder connecting sleeve 260 is fixedly connected to the lower end of the inner cylinder 250 through a screw thread. Thereafter, the inner cylinder 220 is inserted into the outer cylinder 210 from the upper end of the outer cylinder 210, and the shear pins 205 are installed to fixedly connect the inner cylinder 220 and the outer cylinder 210, and the inner cylinder 220 closes the guide holes 211 of the outer cylinder 210. Thereafter, the upper joint 201 is fixedly mounted to the upper end of the outer cylinder 210 by means of screw coupling. Thereafter, the elastic member 230 is installed between the outer cylinder 210 and the inner cylinder connection sleeve 260 from the lower end of the outer cylinder 210, and the lower joint 202 is fixedly installed to the lower end of the outer cylinder 210 by means of screw-coupling. Thereby, the sand control sliding sleeve 200 is assembled.
The operation of the sand control sliding sleeve 200 is briefly described below. First, in the first state, as shown in fig. 4, the first portion 221 of the inner tube 220 is positioned at the axial upper end of the pilot hole 211, so that the second portion 222 of the inner tube 220 blocks the pilot hole 211. The sand control sliding sleeve 200 is coupled into a construction string and then lowered into the wellbore until a predetermined construction formation is reached. Then, a sliding sleeve opening tool 270 (see fig. 5) is put in from the wellhead until the sliding sleeve opening tool reaches the sand control sliding sleeve 200 and is in fit engagement with the opening and closing groove 221 on the inner wall of the second part 222 of the inner barrel 220, and pressure is build up in the sand control sliding sleeve 200 to form downward pressure on the second part 222, so that the second part 222 shears the shear pin 205. The second portion 222 drives the first portion 221 to synchronously descend and the lower end surface compresses the elastic member 230 until the limiting mechanism 250 is engaged into the limiting groove 213 and moves to the lower end of the limiting groove 213, so as to completely open the diversion hole 211 and keep the diversion hole 211 open under the action of the pressure in the well and the sliding sleeve opening tool. Fig. 5 illustrates a second state of the sand control sliding sleeve 200. At this time, the sand control sliding sleeve 200 may perform fracturing construction through the guide holes 211. The second part moves upwards relative to the outer barrel to the position limiting mechanism, moves to the upper end of the position limiting groove and is clamped at the upper end of the position limiting groove.
After fracturing construction is completed, the sliding sleeve opening tool does not have vertical pressure difference in flowback and production processes, and the sliding sleeve opening tool is dissolved or returns to the wellhead. Therefore, the second part 222 of the inner cylinder 220 has no difference between the upper pressure and the lower pressure, which enables the elastic member 230 to release the elastic force and push the inner cylinder 220 to move upwards until the limiting mechanism moves 250 to the upper end of the limiting groove 213 and is clamped at the upper end of the limiting groove, thereby forming axial limitation on the inner cylinder 220 and preventing the inner cylinder 220 from moving upwards continuously. At this time, the sand control passage 223 of the first part 221 faces the flow guide hole 211, so that the sand control sliding sleeve 200 is in a sand control state. Fig. 6 illustrates a third state of the sand control sliding sleeve 200. The sand control channel 223 of the first part 221 can effectively prevent sand collapsed from entering the inner tube of the tubular column, so that the sand control function is realized, and the normal operation of production operation is effectively ensured.
The sand control sliding sleeve 200 according to the embodiment has a simple structure, greatly reduces the installation difficulty, simplifies the construction steps, obviously improves the production operation efficiency, and effectively improves the sand control performance.
According to the sand control sliding sleeve, fracturing construction and sand control can be realized through one string, multiple functions of fracturing construction, sand control and the like are integrated, the construction steps are greatly simplified, and the production operation efficiency is remarkably improved. Moreover, the sand prevention performance of the sand prevention sliding sleeve is obviously enhanced through the sand prevention component, so that the sand prevention sliding sleeve can effectively prevent sand collapsed on the well wall from entering the inner tube of the tubular column, the normal operation of production operation is ensured, and the sand prevention effect and the reliability of the sand prevention sliding sleeve are further improved. The sand control sliding sleeve can be used on an open hole staged fracturing well completion pipe string, and can solve the problem of sand control after fracturing. In addition, the sand prevention sliding sleeve is simple in structure, convenient to operate, convenient to install and low in cost.
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 sand control sliding sleeve comprising:
the outer cylinder (110), there are flow guide holes (111) on the sidewall of the said outer cylinder; and
an inner barrel (120) concentrically mounted within the outer barrel, the inner barrel comprising a first section (121) configured with sand control passages (123) and a second section (122) connected to the first section;
wherein, in the first state, the main body of the second part of the inner cylinder seals the diversion hole to lead the outer space of the outer cylinder and the inner space of the inner cylinder not to be communicated,
in a second state, the first and second sections are moved downward with respect to the outer tub such that the guide holes are misaligned with the first and second sections to directly communicate the outer space of the outer tub and the inner space of the inner tub through the guide holes,
in a third state, the first part of the inner cylinder moves upwards to enable the sand control channel to be communicated with the flow guide holes relatively, so that the outer space of the outer cylinder is communicated with the inner space of the inner cylinder through the sand control channel.
2. The sand control sliding sleeve of claim 1, wherein the first portion is nested between the second portion and the outer barrel, and wherein in a first state and a second state the first portion is fixedly coupled to the second portion by a first pin (104), and in a third state the first pin is disabled, and wherein the first portion moves upward relative to the outer barrel independently of the second portion.
3. The sand control sliding sleeve according to claim 2, wherein the second portion is provided with a liquid inlet hole (125) penetrating through the side wall, a liquid inlet gap (126) is formed between the inner cylinder and the outer cylinder,
in a third state, the liquid in the well flows to the first pin through the liquid inlet hole and the liquid inlet gap, and the first pin can be dissolved to fail under the action of the liquid in the well.
4. The sand control sliding sleeve according to claim 2 or 3, wherein in the first state, the inner cylinder and the outer cylinder form a fixed connection through a second pin (105), the sand control passage of the first part is opposite to the flow guide hole of the outer cylinder, and the sand control passage and the flow guide hole are simultaneously blocked by the main body of the second part.
5. The sand control sliding sleeve according to any one of claims 2 to 4, wherein a first step surface facing upward is configured at an inner side of the outer cylinder, the first step surface is located below the first portion and opposite to the first portion, an elastic member (130) is provided between the first portion and the first step surface,
in the second state, the first part shears the second pin and moves downwards to compress the elastic part,
in a third state, the elastic member drives the first part to move upwards.
6. The sand control sliding sleeve according to any one of claims 2 to 5, wherein a mounting groove is provided on an outer wall of the second section, a locking mechanism (150) is installed in the mounting groove, and an annular groove is provided on an inner wall of the outer cylinder,
in a second state, the second part moves downwards relative to the outer barrel until the locking mechanism is opposite to the annular groove and is embedded into the annular groove,
in a third state, the second part and the outer cylinder are kept relatively fixed under the action of the locking mechanism.
7. The sand control sliding sleeve according to claim 1, wherein the first section is coupled to the second section such that in the first state the sand control passageway of the first section is opposite the body of the outer barrel above the deflector hole.
8. The sand control sliding sleeve according to claim 7, wherein a lower joint (202) is fixedly connected to a lower end of the outer cylinder, an upper end of the lower joint is inserted into the outer cylinder, an elastic member (230) is installed between a lower end surface of the second portion and an upper end surface of the lower joint,
in a second state, the first and second portions move downward to compress the elastic member,
in a third state, the elastic piece drives the second part to move upwards to the sand control channel of the first part to be communicated with the flow guide hole of the outer barrel relatively.
9. The sand control sliding sleeve according to claim 7 or 8, wherein an installation groove is arranged on the outer wall of the second part, a limiting mechanism (250) is arranged in the installation groove, a limiting groove (213) is arranged on the inner wall surface of the outer cylinder,
in the first state, the limiting mechanism is positioned above the limiting groove,
in a second state, the second portion moves downward relative to the outer cylinder until the stopper mechanism engages into the stopper groove and moves to a lower end of the stopper groove,
in a third state, the second part moves upwards relative to the outer cylinder until the limiting mechanism moves to the upper end of the limiting groove and is clamped at the upper end of the limiting groove.
10. The sand control sleeve of any one of claims 1 to 9 wherein a radially outwardly extending switch slot (124) is provided on an inner wall of the second section, the sleeve opening tool being engageable with the switch slot to move the first and second sections downwardly relative to the outer barrel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011227284.XA CN114439445B (en) | 2020-11-06 | 2020-11-06 | Sand prevention sliding sleeve |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011227284.XA CN114439445B (en) | 2020-11-06 | 2020-11-06 | Sand prevention sliding sleeve |
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| CN114439445B CN114439445B (en) | 2024-06-18 |
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| CN118029958A (en) * | 2024-03-14 | 2024-05-14 | 西南石油大学 | Infinite sand control fracturing sliding sleeve |
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| CN114439445B (en) | 2024-06-18 |
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