CN114439445B - Sand prevention sliding sleeve - Google Patents
Sand prevention sliding sleeve Download PDFInfo
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- CN114439445B CN114439445B CN202011227284.XA CN202011227284A CN114439445B CN 114439445 B CN114439445 B CN 114439445B CN 202011227284 A CN202011227284 A CN 202011227284A CN 114439445 B CN114439445 B CN 114439445B
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- outer cylinder
- sand control
- liquid inlet
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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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- 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
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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
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
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- Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
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- 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 control sliding sleeve, which comprises: the outer cylinder is provided with a diversion hole on the side wall thereof; and an inner barrel concentrically mounted within the outer barrel, the inner barrel including a first portion configured with a sand control channel and a second portion coupled to the first portion; in the first state, the main body of the second part of the inner cylinder seals the diversion hole so as to enable the outer space of the outer cylinder to be non-communicated with the inner space of the inner cylinder, in the second state, the first part and the second part move downwards relative to the outer cylinder so that the diversion hole is staggered with the first part and the second part, the outer space of the outer cylinder and the inner space of the inner cylinder are directly communicated through the diversion hole, and in the third state, the first part of the inner cylinder moves upwards so that the sand prevention channel is relatively communicated with the diversion hole, so that the outer space of the outer cylinder is communicated with the inner space of the inner cylinder through the sand prevention channel.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas well completion, in particular to a sand control sliding sleeve.
Background
The open hole staged fracturing completion process is a common means for efficiently developing tight oil and gas reservoirs, and compared with a sleeve staged fracturing completion process, the open hole staged fracturing completion process has larger contact area between a production layer and an oil and gas production channel and more oil and gas seepage channels. The staged fracturing technology commonly used at present adopts a sliding sleeve and a packer to perform staged fracturing, which is a well completion mode with higher efficiency and lower production cost. However, the conventional sliding sleeve does not have a sand control function, so that the risk of stratum sand production or well wall collapse easily occurs in the oil gas production process after the completion of fracturing in an open hole staged fracturing well completion process, and even a large amount of sand or collapsed matters possibly enter a well shaft, so that the management and maintenance of the oil gas well in the later stage are extremely difficult. Therefore, the sand prevention function of the sliding sleeve is particularly important.
Accordingly, it is desirable to provide a sliding sleeve with sand control functionality.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide the sand control sliding sleeve which can be used on an open hole sectional fracturing completion pipe string and can effectively prevent sand produced by a stratum and solid matters collapsed by a well wall from entering the sliding sleeve and a well shaft in the exploitation process, so that the production quality is ensured.
To this end, according to the present invention, there is provided a sand control slip comprising: the outer cylinder is provided with a diversion hole on the side wall thereof; and an inner barrel concentrically mounted within the outer barrel, the inner barrel including a first portion configured with a sand control channel and a second portion coupled to the first portion; in the first state, the main body of the second part of the inner cylinder seals the diversion hole so as to enable the outer space of the outer cylinder to be non-communicated with the inner space of the inner cylinder, in the second state, the first part and the second part move downwards relative to the outer cylinder so that the diversion hole is staggered with the first part and the second part, the outer space of the outer cylinder and the inner space of the inner cylinder are directly communicated through the diversion hole, and in the third state, the first part of the inner cylinder moves upwards so that the sand prevention channel is relatively communicated with the diversion hole, so that the outer space of the outer cylinder is communicated with the inner space of the inner cylinder through the sand prevention channel.
In one embodiment, the first portion is nested between the second portion and the outer barrel, the first portion is fixedly connected to the second portion by a first pin in a first state and a second state, the first pin is disabled in a third state, and the first portion moves upward relative to the outer barrel independently of the second portion.
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 be invalid 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 a second pin, the sand prevention channel of the first part is opposite to the diversion hole of the outer cylinder, and the sand prevention channel and the diversion hole are blocked by the main body of the second part at the same time.
In one embodiment, a first step surface facing upwards is configured on the inner side of the outer cylinder, the first step surface is positioned below the first part and opposite to the first part, an elastic piece is arranged between the first part and the first step surface,
In the second state, the first part shears the second pin to move downwards to compress the elastic piece,
In a third state, the elastic member drives the first portion to move upward.
In one embodiment, a mounting groove is formed in the outer wall of the second portion, a locking mechanism is mounted in the mounting groove, an annular groove is formed in the inner wall of the outer barrel, the second portion 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 the second state, and the second portion and the outer barrel are kept relatively fixed under the action of the locking mechanism in the third state.
In one embodiment, the first portion is coupled to the second portion such that in a first state, the sand control passage of the first portion is opposite the body of the outer barrel above the deflector aperture.
In one embodiment, a lower connector is fixedly connected to the lower end of the outer cylinder, the upper end of the lower connector is inserted into the outer cylinder, an elastic member is installed between the lower end face of the second part and the upper end face of the lower connector, in a second state, the first part and the second part move downwards to compress the elastic member, and in a third state, the elastic member drives the second part to move upwards to the sand prevention channel of the first part to be communicated with the diversion hole of the outer cylinder relatively.
In one embodiment, a mounting groove is formed in the outer wall of the second portion, a limiting mechanism is mounted in the mounting groove, a limiting groove is formed in the 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 to the position where the limiting mechanism is engaged in the limiting groove and moves to the lower end of the limiting groove, and in a third state, the second portion moves upwards relative to the outer cylinder to the position where the limiting mechanism moves to the upper end of the limiting groove and is clamped at the upper end of the limiting groove.
In one embodiment, a radially outwardly extending switch slot is provided in the inner wall of the second portion, and the sliding sleeve opener is engageable with the switch slot to move the first and second portions downwardly 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 pipe column, integrates a plurality of functions of fracturing construction, sand control and the like, greatly simplifies construction operation steps, and remarkably improves construction and production operation efficiency. 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 produced by a stratum and solid matters collapsed by a well wall from entering the inner barrel of the tubular column, normal operation of production is ensured, and the sand prevention effect and reliability of the sand prevention sliding sleeve are further improved. The sand control sliding sleeve can be used for an open hole sectional fracturing completion pipe column, and can effectively prevent sand produced by a stratum and solid substances collapsed by a well wall from entering the sliding sleeve and a well shaft in the exploitation process, so that the production quality is ensured. In addition, the sand control sliding sleeve has the advantages of simple structure, convenient operation and low cost.
Drawings
The present invention will be described below with reference to the accompanying drawings.
FIG. 1 illustrates a first state of a sand control sleeve according to a first embodiment of the present invention.
FIG. 2 shows a second state of a sand control sliding sleeve according to the present invention.
FIG. 3 shows a third condition of a sand control sliding sleeve according to the present invention.
Fig. 4 is an enlarged view of area a in fig. 2.
FIG. 5 illustrates a first state of a sand control sleeve according to a second embodiment of the present invention.
FIG. 6 illustrates a second state of the sand control sleeve of the second embodiment.
FIG. 7 illustrates a third condition of the sand control sleeve of the second embodiment.
In the present application, all of the figures are schematic drawings which are intended to illustrate the principles of the application only and are not to scale.
Detailed Description
The invention is described below with reference to the accompanying drawings.
In the present application, the end of the sand control sliding sleeve, which is placed in the well bore and is close to the wellhead, is defined as an upper end or a similar term, and the end, which is far from the wellhead, is defined as a lower end or a similar term.
FIG. 1 illustrates 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 installed at both ends of the outer cylinder 110, respectively. The upper joint 101 and the lower joint 102 are used to connect a down-hole string, respectively, to connect the sand control sliding sleeve 100 into the down-hole string and to be run down-hole with the down-hole string. In one embodiment, the upper joint 101 and the lower joint 102 are provided with stepped connecting buckles, the connecting buckles are provided with external threads, and simultaneously, both ends of the inner wall of the outer cylinder 110 are provided with internal threads. The outer tube 110 is fixedly attached to the upper joint 101 and the lower joint 102 by screwing. This manner of attachment of sand control sleeve 100 is simple to install and is stable and reliable.
In order to ensure the sealing property between the outer tube 110 and the upper joint 101 and the lower joint 102, a sealing material is provided between the connecting surfaces of the outer tube 110 and the upper joint 101 and the lower joint 102. In one embodiment, the seal is a seal ring. Therefore, the tightness of the joint between 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 is ensured.
According to the present invention, a plurality of deflector holes 111 are provided on the sidewall of the outer tub 110. As shown in fig. 1, the deflector hole 111 is provided on a side wall of the outer tub 110 near an upper end (left end in fig. 1). The plurality of deflector 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 fluid flow through the well to perform the fracturing job.
As shown in FIG. 1, sand control sliding sleeve 100 also includes an inner barrel 120. The inner cylinder 120 is concentrically mounted inside the outer cylinder 110. The inner cylinder 120 includes a cylindrical first portion 121 and a second portion 122 connected to a lower end of the first portion 121, and a sand prevention passage 123 is provided on a sidewall of the first portion 121. In the first state (initial state), the second portion 122 of the inner tube 120 is fixedly coupled to the outer tube 110 by the second pin 105, and the inner tube 120 is caused to block the deflector aperture 111. In one embodiment, the second pin 105 is a shear pin. Sand control channels 123 may be configured as at least one of sand control joints, sand control apertures, or sand control screens.
According to the present invention, a switch groove 124 extending radially outward is provided on the inner wall surface of the inner cylinder 120. In operation, the sliding sleeve opening tool (not shown) can be matched with the inner cylinder groove 124 to form a clamping fit, so that the inner cylinder 120 can be driven to move axially downwards to open the diversion hole 111. In the actual working process, the sliding sleeve opening tool is put into the sand control sliding sleeve from the wellhead and is matched with the switch groove 124 to form a clamping fit, so that the sliding sleeve opening tool applies downward acting force to the inner barrel 120 until the second pin 105 is sheared, the inner barrel 120 is enabled to descend, the diversion hole 111 is opened, and the outer space of the outer barrel 110 and the inner space of the inner barrel 120 are directly conducted through the diversion hole 111. At this time, the open 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. The inner cylinder 120 moves axially downward while descending and compresses the elastic member 130, and the elastic member 130 is configured to release the elastic force to push the first portion 121 of the inner cylinder 120 to move axially upward until the sand prevention channel on the first portion 121 of the inner cylinder 120 faces the guide hole 111, thereby allowing the outer space of the outer cylinder 110 to be in communication with the inner space of the inner cylinder 120 through the sand prevention channel 123. At this time, the diversion hole 111 is opened through the sand prevention passage 123 to be in the third state, and in this state, sand prevention production operation can be performed.
The sand control sleeve is described in detail below with respect to various embodiments.
Embodiment one:
As shown in fig. 1, the second portion 122 of the inner barrel 120 is configured to include a first cylinder 1221 and a second cylinder 1222 fixedly connected 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 screw-threaded connection. The inner diameters of the first cylinder 1221 and the second cylinder 1222 are equal, and the outer diameter of the first cylinder 1221 is smaller than the outer diameter of the second cylinder 1222. Thereby, 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 tube 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 coupled to the outer cylinder by the second pin 105, and the first cylinder 1221 is closed off the deflector aperture 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 outer diameter of the cylindrical connecting portion is set to be equal to the inner diameter of the outer cylinder 110, while the inner diameter is set to be smaller than the inner diameter of the upper joint 101, and the inner diameter is set to be 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 upper joint 101 is very advantageous for sealing sand control sleeve 100.
As shown in fig. 1, the first portion 121 of the inner barrel 120 is nested between the second portion 122 and the outer barrel 110. In the first state, the first portion 121 forms a fixed connection with the second portion 122 via the first pin 104. Meanwhile, in this state, the inner cylinder 120 is fixedly coupled to the outer cylinder 110 by the second pin 105, and the main body of the second portion 122 simultaneously blocks the sand prevention passage 123 and the diversion hole 111. In the first state, the sand control passage 123 of the first portion 121 faces the deflector hole 111 of the outer tube 110, and the upper end surface of the inner tube 120 contacts the lower end surface of the upper joint 101. In order to secure sealability between the first portion 121 and the sidewall of the outer tub 110, a plurality of sealing members are provided between the first portion 121 and the sidewall of the outer tub 110, which are respectively provided at the upper and lower sides of the sand prevention channel 123. In the present embodiment, the upper end surface of the shoulder 112 of the outer cylinder 110 is configured as an upward facing first step surface that is located below the first portion 121 and opposite the first portion 121, and the elastic member 130 is disposed between the first portion 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 a certain compression, and both ends of the elastic member 130 are respectively abutted against the lower end surface and the first step surface of the first portion 121. In the second state, the inner barrel 120 shears the second pin 105 for downward movement, compressing the resilient member 130. In the third condition, the first pin 104 is deactivated, thereby enabling the first portion 121 to move upwardly relative to the outer barrel 110 independently of the second portion 122 under the influence of the resilient member 130.
In this embodiment, the inner cylinder 120 is provided with a liquid inlet 125 penetrating through a sidewall, preferably, the liquid inlet 125 is disposed on a sidewall of the first cylinder 1221 near the lower end, 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 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 inlet 125 being axially between the two seals. In the first state, under the action of the two sealing elements, 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 seals between the second cylinder 1222 and the outer cylinder 110 are in the annular space and do not perform a sealing function, at this time, the liquid inlet 125 communicates with the liquid inlet slit 126. Thus, the well fluid flows through the fluid inlet 125 and fluid inlet gap 126 to the first spike 104, and the first spike 104 is able to dissolve to fail under the action of the well fluid.
According to the present invention, a mounting groove is provided on the outer wall of the second portion 122 of the inner cylinder 120, in which a locking mechanism 150 is mounted, while an annular groove 113 is provided on the inner wall of the outer cylinder 110. In the second state, the second portion 122 moves downward relative to the outer barrel 110 until the locking mechanism 150 is opposite the annular groove 113 and is embedded within the annular groove 113, thereby forming an axial lock for the second portion 122. Thereby, the pilot hole 111 is allowed to remain open for the fracturing construction. And, in the third state, the locking mechanism 150 maintains the second portion 122 relatively fixed with the outer barrel 110. In one embodiment, the locking mechanism 150 may be a snap spring, a C-ring, or a limit ratchet. In another embodiment, the locking mechanism 150 may employ a combination of springs and stops, for example. Initially, the spring is compressively disposed between the stop and the bottom wall of the mounting groove such that the stop is received within the mounting groove.
When the sand control sliding sleeve 100 is installed, first, the first portion 121 of the inner cylinder 120 and the elastic member 130 are sleeved on the first cylinder 1221 of the second portion 122, and the first portion 121 and the first cylinder 1221 are fixedly connected by the first pin 104. Thereafter, the first portion 121 and the first cylinder 1222 are fitted together into the outer cylinder 110, and the lower end of the elastic member 130 is abutted against the first stepped surface in the outer cylinder 110. After that, the upper joint 101 is screwed to the upper end of the outer cylinder 110. Thereafter, the locking mechanism 150 is installed in an installation groove on the outer wall of the second cylinder 1222 of the second part 122, and then the second cylinder 1222 is fitted into the outer cylinder 110 from the lower end of the outer cylinder 110, and the second cylinder 1222 is fixedly coupled with the first cylinder 1221 by screw threads. Thereafter, the outer barrel 110 is fixedly coupled to the second portion 122 of the inner barrel 120 by the second pin 105. Then, the lower joint 102 is fixedly connected with the lower end of the outer cylinder 110 through threads, thereby completing the assembly of the sand control sliding sleeve 100.
The operation of sand control sleeve 100 is briefly described below. First, in the first state, as shown in fig. 1, the bodies of the first portion 121 and the second portion 122 of the inner tube 120 are both at the upper end portion of the outer tube 110, and the deflector hole 111 is blocked. Sand control sleeve 100 is coupled into a construction string and then lowered into the wellbore until a predetermined formation is reached. Thereafter, a sleeve opener (not shown) is inserted from the wellhead until the sleeve opener reaches the sand control sleeve 100 and is engaged with the switch slot 124 in the inner barrel 120, and is pressed in the sand control sleeve 100 to form a downward pressure on the inner barrel 120, so that the second portion 122 of the inner barrel 120 shears the second pin 105. The second portion 122 drives the first portion 121 to move downward synchronously, so that the first portion 121 compresses the elastic member 130 until the deflector hole 111 is completely opened. At this time, the locking mechanism 150 is engaged with the annular groove 113 to lock the second portion 122, so that the diversion hole 111 is kept open. Thus, the outer space of the outer tube 110 and the inner space of the inner tube 120 are directly connected through the guide hole 111. FIG. 2 illustrates a second state of sand control sliding sleeve 100. At this time, the fracturing fluid in the sand control sliding sleeve 100 may be subjected to fracturing construction through the diversion holes 111.
After the fracturing construction is completed, as the fracturing fluid flows back, the first pin 104 fixedly connecting the first part 121 and the second part 122 of the inner cylinder 120 slowly dissolves under the action of the flow-back fluid. Therefore, the elastic member 130 can release the elastic force and drive the first portion 121 to move upwards until the first portion 121 reaches the initial position, and the sand control channel 123 is opposite to the diversion hole 111 on the outer cylinder 110, so that the outer space of the outer cylinder 110 and the inner space of the inner cylinder 120 are communicated through the sand control channel 123. FIG. 3 illustrates a third condition of sand control sliding sleeve 100. At this time, the sand control sliding sleeve 100 is in a sand control state, and sand collapsed by the well wall can be effectively prevented from entering the inner cylinder of the pipe column through the sand control channel 123, so that the 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, convenient operation, simplified construction steps, remarkably improved production operation efficiency, effectively improved sand control performance and high reliability.
Embodiment two:
FIG. 5 illustrates the structure of a sand control sleeve 200 according to a second embodiment of the present invention. As shown in fig. 5, the inner cylinder 220 is cylindrical, and the switch groove 224 is preferably provided on the inner wall of the inner cylinder 220 near the middle region. The second embodiment is different from the first embodiment in the structure and arrangement position of the first portion 221 of the inner cylinder 220 and the arrangement position of the elastic member.
As shown in FIG. 4, a first portion 221 of inner barrel 220 is coupled to an upper end of a second portion 222, the first portion being provided with sand control passages 223. Preferably, the first portion 221 and the second portion 222 are integrally provided. In the first state, the second portion 222 is fixedly coupled to the outer tub 210 by the shear pin 205, and the sand control channel 223 is opposite to the body of the outer tub 210 above the deflector hole 211, thereby blocking the deflector hole 211. In a sand control state, sand control channels 223 may correspond with pilot holes 211 to control sand. In order to ensure the sealing of the second portion 222 of the inner cylinder 220 against the deflector hole 211, a plurality of sealing members are provided between the second portion 222 and the side wall of the outer cylinder 210, which are spaced apart and are located on the upper and lower sides of the deflector hole 211, respectively, in an initial state.
In the second embodiment, an inner cylinder connecting sleeve 260 is fixedly connected to the lower end of the second portion 222 of the inner cylinder 220. The inner barrel connection sleeve 260 is fixedly connected with the second part 222 in a threaded connection manner. The outer diameter of the inner cylinder connecting sleeve 260 is smaller than the inner diameter of the second portion 222 and is set to be equal to the inner diameter of the lower joint 202, and the inner cylinder connecting sleeve 260 extends into the lower joint 202 and receives guide with the inner wall surface of the lower joint 202. Thereby, a closed annular cavity is formed between the inner barrel connecting sleeve 260 and the outer barrel 210 and between the lower end surface of the second portion 222 and the upper end surface 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 adapter sleeve 260 downward and compressing the resilient member 230 after shearing the shear pin 205 until the deflector aperture 211 is fully opened.
In the present embodiment, a limit step 212 is provided at 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 descend to the position where the lower end face just abuts against the limiting step 212, and the guide hole 211 can be guaranteed to be completely opened. The limiting step 212 also prevents the inner barrel 220 from over-compressing the resilient member 230, thereby avoiding failure of the resilient member 230.
According to the present invention, a mounting groove is provided on the outer wall of the second portion 222, a limiting mechanism 250 is installed in the mounting groove, and a limiting groove 213 is provided on the inner wall of the outer cylinder 210. The limiting groove 213 can form an axial limit to the limiting mechanism 250, so that the inner cylinder 220 can move within a certain axial range through the limiting mechanism 250 and the limiting groove 213. In one embodiment, the spacing mechanism 250 employs spacing ratchet teeth. It will be understood, of course, that the stop mechanism 250 may also be implemented as a snap spring or a C-ring. In the first state, the limiting mechanism 250 is located above the limiting groove 213. In the second state, the second portion 222 moves downward relative to the outer barrel 210 until the spacing mechanism 250 engages within the spacing groove 213 and moves to the lower end of the spacing groove 213. In the third state, the second portion 222 moves upward relative to the outer cylinder 210 until the limiting mechanism 250 moves to the upper end of the limiting groove 213 and is clamped at the upper end of the limiting groove 213.
When the sand control sliding sleeve 200 is installed, firstly, 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 threads. Thereafter, the inner tube 220 is inserted into the outer tube 210 from the upper end of the outer tube 210, and the shear pin 205 is installed, the inner tube 220 and the outer tube 210 are fixedly connected, and the inner tube 220 is closed off the flow guide hole 211 on the outer tube 210. After that, the upper joint 201 is fixedly attached to the upper end of the outer cylinder 210 by screwing. Thereafter, the elastic member 230 is mounted between the outer tub 210 and the inner tub connecting sleeve 260 from the lower end of the outer tub 210, and the lower joint 202 is fixedly mounted to the lower end of the outer tub 210 by screwing. Thereby, the sand control sliding sleeve 200 is assembled.
The operation of sand control 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 at the axial upper end of the deflector hole 211, so that the second portion 222 of the inner tube 220 blocks the deflector hole 211. Sand control sleeve 200 is coupled into a construction string and then lowered into the wellbore until a predetermined formation is reached. Afterwards, a sliding sleeve opening tool 270 (see fig. 5) is put into the well from the well mouth until the sliding sleeve opening tool reaches the sand control sliding sleeve 200 and is in fit engagement with the switch groove 221 on the inner wall of the second portion 222 of the inner barrel 220, and is pressed in the sand control sliding sleeve 200 to form downward pressure on the second portion 222, so that the second portion 222 shears the shear pin 205. The second portion 222 drives the first portion 221 to move downward synchronously and the lower end face 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, thereby completely opening the deflector hole 211 and keeping the deflector hole 211 open under the action of the pressure in the well and the sliding sleeve opening tool. FIG. 5 shows a second state of sand control sleeve 200. At this time, the sand control sliding sleeve 200 may be subjected to fracturing construction through the diversion holes 211. The second part moves upwards relative to the outer barrel until the limiting mechanism moves to the upper end of the limiting groove and is clamped at the upper end of the limiting groove.
After the fracturing construction is completed, no up-down pressure difference exists in the flowback and production process of the sliding sleeve opening tool, and the sliding sleeve opening tool is dissolved or returned to a wellhead. Thus, the second portion 222 of the inner cylinder 220 has no up-down pressure difference, 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 blocked at the upper end of the limiting groove, thereby forming an axial limitation on the inner cylinder 220 and preventing the inner cylinder 220 from continuing to move upwards. At this time, the sand control channels 223 of the first portion 221 face the diversion holes 211 such that the sand control sliding sleeve 200 is in a sand control state. FIG. 6 illustrates a third condition of sand control sleeve 200. The sand control channel 223 of the first part 221 can effectively prevent sand collapsed by the well wall from entering the inner cylinder of the pipe column, thereby realizing the sand control function and effectively ensuring the normal operation of production operation.
The sand control sliding sleeve 200 according to the embodiment has a simple structure, greatly reduces the installation difficulty, simplifies the construction steps, remarkably improves the production operation efficiency and effectively improves the sand control performance.
The sand control sliding sleeve can realize fracturing construction and sand control through one pipe column, integrates a plurality of functions such as fracturing construction and sand control, greatly simplifies construction steps, and remarkably improves production operation efficiency. 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 by a well wall from entering the inner cylinder of the pipe column, normal operation of production operation is ensured, and the sand prevention effect and reliability of the sand prevention sliding sleeve are further improved. The sand control sliding sleeve can be used for an open hole sectional fracturing completion pipe string, and can solve the problem of sand control after fracturing. In addition, the sand control sliding sleeve has the advantages of simple structure, convenient operation, convenient installation and low cost.
Finally, it should be noted that the above description is only of a preferred embodiment of the invention and is not to be construed as limiting the invention in any way. Although the 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 techniques described in the foregoing examples, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A sand control slip sleeve comprising:
an outer tube (110) provided with a deflector hole (111) on the side wall thereof; and
An inner barrel (120) concentrically mounted within the outer barrel, the inner barrel including a first portion (121) configured with a sand control channel (123) and a second portion (122) connected to the first portion;
wherein in the first state, the main body of the second part of the inner cylinder seals the diversion hole so as to lead the outer space of the outer cylinder to be non-conductive with the inner space of the inner cylinder,
In a second state, the first part and the second part move downwards relative to the outer cylinder so that the diversion holes are staggered with the first part and the second part to directly conduct the outer space of the outer cylinder and the inner space of the inner cylinder through the diversion holes,
In a third state, the first part of the inner cylinder moves upwards to enable the sand prevention channel to be communicated with the diversion hole oppositely, so that the outer space of the outer cylinder and the inner space of the inner cylinder are communicated through the sand prevention channel,
The first part is sleeved between the second part and the outer cylinder, the first part is fixedly connected with the second part through a first pin (104) in a first state and a second state, the first pin fails in a third state, the first part moves upwards relative to the outer cylinder independently of the second part,
The second part 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, wherein the liquid inlet hole is axially arranged between two sealing pieces which are arranged between the second part and the outer cylinder and are axially distributed at intervals, so that in a first state, no communication is formed between the liquid inlet hole and the liquid inlet gap (126), in a second state, communication is formed between the liquid inlet hole and the liquid inlet gap (126), so that well liquid can flow to the first pin through the liquid inlet hole and the liquid inlet gap, and in a third state, the first pin is dissolved and is disabled under the action of the well liquid, so that the first part of the inner cylinder is allowed to move upwards,
In a first state, the inner cylinder and the outer cylinder are fixedly connected through a second pin (105), the sand prevention channel of the first part is opposite to the diversion hole of the outer cylinder, the sand prevention channel and the diversion hole are simultaneously blocked by the main body of the second part,
A first step surface facing upwards is formed on the inner side of the outer cylinder, the first step surface is positioned below the first part and is opposite to the first part, an elastic piece (130) is arranged between the first part and the first step surface,
In the second state, the first part shears the second pin to move downwards to compress the elastic piece,
In a third state, the elastic member drives the first portion to move upward,
A mounting groove is arranged on the outer wall of the second part, a locking mechanism (150) is arranged in the mounting groove, an annular groove is arranged on the inner wall of the outer cylinder,
In a second state, the second part moves downwards relative to the outer cylinder until the locking mechanism is opposite to the annular groove and is embedded into the annular groove,
In the third state, the second part and the outer cylinder are kept relatively fixed under the action of the locking mechanism.
2. The sand control sliding sleeve of claim 1 wherein a radially outwardly extending switch slot (124) is provided in an inner wall of said second portion and a sliding sleeve opener is engageable with said switch slot to move said first and second portions downwardly relative to said 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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| CN114439445A CN114439445A (en) | 2022-05-06 |
| CN114439445B true 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 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103299030A (en) * | 2011-01-21 | 2013-09-11 | 贝克休斯公司 | Combined fracturing outlet and production port for a tubular string |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104100249B (en) * | 2013-04-03 | 2016-06-15 | 中国石油天然气股份有限公司 | Sleeve sliding sleeve without limited segment fracturing |
| CN205689174U (en) * | 2016-05-20 | 2016-11-16 | 中石化石油工程技术服务有限公司 | A kind of hinge type can criticize level open sliding sleeve opener and etc. diameter through sleeve sliding sleeve |
| CN206458410U (en) * | 2017-02-20 | 2017-09-01 | 中国石油天然气股份有限公司 | Spring sliding sleeve type sand blower |
| CA2966123C (en) * | 2017-05-05 | 2018-05-01 | Sc Asset Corporation | System and related methods for fracking and completing a well which flowably installs sand screens for sand control |
| CN211692429U (en) * | 2020-01-10 | 2020-10-16 | 新疆恒智伟业石油工程技术开发有限公司 | Multifunctional fracturing well completion pipe string for high-temperature and high-pressure oil and gas well |
| CN111173488B (en) * | 2020-03-16 | 2021-11-30 | 西安诚科石油工程技术服务有限公司 | Method for realizing production of gas well by using controllable shock wave |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103299030A (en) * | 2011-01-21 | 2013-09-11 | 贝克休斯公司 | Combined fracturing outlet and production port for a tubular string |
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