CN114439418A - Rail-changing type sand-proof sliding sleeve - Google Patents
Rail-changing type sand-proof sliding sleeve Download PDFInfo
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- CN114439418A CN114439418A CN202011227145.7A CN202011227145A CN114439418A CN 114439418 A CN114439418 A CN 114439418A CN 202011227145 A CN202011227145 A CN 202011227145A CN 114439418 A CN114439418 A CN 114439418A
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- state
- inner cylinder
- outer cylinder
- sand control
- cylinder
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
Abstract
The invention relates to a rail-changing type sand-proof sliding sleeve, which comprises: an outer cylinder configured with an outer passage penetrating in a radial direction; the inner cylinder is sleeved in the outer cylinder and is provided with a sand prevention channel penetrating in the radial direction; in a first state, an external channel of the outer cylinder and a sand prevention channel of the inner cylinder are staggered in the circumferential direction, so that the external space of the outer cylinder and the internal space of the inner cylinder cannot be communicated through the external channel and the sand prevention channel; in a second state, the inner cylinder moves downwards relative to the outer cylinder and rotates in the circumferential direction until the inner cylinder does not overlap with the external channel, so that the external space of the outer cylinder and the internal space of the inner cylinder can be directly communicated through the external channel; in a third state, the inner cylinder moves upward relative to the outer cylinder and rotates in the circumferential direction until the external channel of the outer cylinder is aligned with the sand control channel of the inner cylinder, so that the external space of the outer cylinder and the internal space of the inner cylinder can be communicated through the external channel and the sand control channel.
Description
Technical Field
The invention relates to the technical field of well completion, in particular to a rail-changing type sand prevention sliding sleeve.
Background
The open hole staged fracturing well completion process is one of the means for the efficient development of compact oil and gas reservoirs. Compared with the casing staged fracturing well completion, the contact area between a production layer and an oil and gas production channel in the open hole staged fracturing well completion process is larger, and oil and gas seepage channels are more.
However, the open hole is easy to cause problems of sand production, well wall collapse and the like in production. This can result in sand being produced into the wellbore with the hydrocarbons. Over time, sand entering the wellbore tends to plug the wellbore, resulting in inefficient oil and gas collection. In addition, the method also causes great trouble to the later oil and gas well management and maintenance.
It is therefore desirable to provide a device that can facilitate the prevention of sand from entering the wellbore during hydrocarbon production.
Disclosure of Invention
In order to solve the problems, the invention provides a rail-changing type sand prevention sliding sleeve which is beneficial to preventing sand from entering a shaft in the oil and gas exploitation process.
The invention provides a rail-changing type sand-proof sliding sleeve, which comprises: an outer cylinder on which an outer passage penetrating a sidewall of the outer cylinder in a radial direction is configured; the inner cylinder is sleeved in the outer cylinder and is provided with a sand prevention channel which penetrates through the side wall of the inner cylinder in the radial direction; in a first state, an external channel of the outer cylinder and a sand prevention channel of the inner cylinder are staggered in the circumferential direction, so that an external space of the outer cylinder and an internal space of the inner cylinder cannot be communicated through the external channel and the sand prevention channel; in a second state, the inner cylinder moves downwards relative to the outer cylinder and rotates in the circumferential direction until the inner cylinder does not overlap with the external channel, so that the outer cylinder space and the inner cylinder space can be directly communicated through the external channel; in a third state, the inner cylinder moves upward relative to the outer cylinder and rotates in the circumferential direction until the external passage of the outer cylinder is aligned with the sand control passage of the inner cylinder, so that the outer space of the outer cylinder and the inner space of the inner cylinder can be communicated through the external passage and the sand control passage.
For the sliding sleeve, the first state is an initial state. The sliding sleeve remains in the first state during the lowering of the sliding sleeve with the wellbore. At this time, fluid communication between the inside and outside of the sliding sleeve (inside and outside of the wellbore) is performed without passing through the external passage and the sand control passage. After running in, the sleeve transitions to a second state. Fracturing may now be accomplished by pumping in the well, and fracturing fluid in the wellbore may flow through the external passage to the formation. The sleeve may then be transitioned to a third state. At this time, the fluid in the formation can enter the inner cylinder of the sliding sleeve through the external passage and the sand control passage and is transmitted to the ground. Through the arrangement, the smooth running of the well shaft descending, fracturing and exploitation work is favorably ensured. Simultaneously, can also effectively avoid sand to enter into in sliding sleeve and the pit shaft at the exploitation in-process.
In one embodiment, a plurality of external channels are configured on the outer barrel, the plurality of external channels are evenly distributed in the circumferential direction and are spaced apart from each other by an angle δ, and a corresponding plurality of sand control channels are configured on the inner barrel, the plurality of sand control channels are evenly distributed in the circumferential direction and are spaced apart from each other by the angle δ; in a first state, the sand control passages are circumferentially different from adjacent outer passages by an angle δ/2, the inner barrel is rotated relative to the outer barrel by an angle n δ in a first rotational direction during a transition from the first state to a second state, where n is a positive integer, and the inner barrel is rotated relative to the outer barrel by the angle δ/2 in the first rotational direction during a transition from the second state to a third state. In a preferred embodiment, n has a value of 1. .
In one embodiment, a plurality of external channels are configured on the outer barrel, the plurality of external channels are evenly distributed in the circumferential direction and are spaced from each other by an angle δ, and a corresponding plurality of sand control channels are configured on the inner barrel, the plurality of sand control channels are evenly distributed in the circumferential direction and are spaced from each other by the angle δ; in a first state, the sand control passages are circumferentially different from adjacent outer passages by an angle delta/2, and in the process from the first state to a second state, the inner barrel rotates relative to the outer barrel by an angle delta/2 along a first rotating direction1During the process from the second state to the third state, the inner cylinder rotates relative to the outer cylinder by an angle delta along the first rotation direction2Wherein, δ1+δ2＝δ/2。
In one embodiment, a rail groove is configured on an outer sidewall of the inner tube, the rail groove includes a first positioning portion and a corresponding second positioning portion, the second positioning portion is axially upward with respect to the first positioning portion and is circumferentially rearward in the first rotational direction, a fitting pin extending inward into the track groove with respect to the outer cylinder is fitted on the outer cylinder, the track groove includes a set of a plurality of first positioning portions and corresponding second positioning portions that circumferentially surround the inner tube, wherein the second positioning portion in the first group is continuous with the first positioning portion in the adjacent second group, and the fitting pin moves from the first positioning portion of the first group to the second positioning portion of the first group when shifting from the first state to the second state, the fitting pin moves from the second positioning portion of the first group to the first positioning portion of the second group when transitioning from the second state to the third state.
In one embodiment, the first detent includes a first sloped profile and a first vertical profile rearward relative to the first sloped profile in a first rotational direction, the first vertical profile extending along an axial direction, the first sloped profile sloping away from the first rotational direction in an axially downward direction, the mating pin movable between the first sloped profile and the first vertical profile to snap into the first detent; the second positioning portion includes a second vertical profile and a third vertical profile extending in the axial direction and spaced apart from each other, the second vertical profile being forward relative to the third vertical profile in the first rotational direction, the mating pin being movable between the second vertical profile and the third vertical profile to be caught within the second positioning portion; the second vertical contour and the third vertical contour of the second positioning portion of the first group are located above the first inclined contour of the first positioning portion of the second group, and when the second state is switched to the third state, the engaging pin engages with the first inclined contour to drive the inner cylinder to rotate.
In one embodiment, the track groove further includes a second inclined profile located above the first vertical profile and connected to the second vertical profile, the second inclined profile being inclined in an axially downward direction toward the first rotational direction, the engagement pin engaging with the second inclined profile to drive the inner cylinder to rotate when shifting from the first state to the second state.
In one embodiment, a lower joint is connected at a lower end of the outer cylinder, an upper end of the lower joint is inserted into the outer cylinder, a downwardly facing bearing surface is configured at an outer side of the inner cylinder, the bearing surface is opposite to an upper end of the lower joint, and an elastic member is disposed between the bearing surface and the upper end of the lower joint, the elastic member is configured to be compressed when passing from a first state to a second state, and to be restored when passing from the second state to a third state to drive the inner cylinder to move upward relative to the outer cylinder.
In one embodiment, the lower end of the inner cylinder extends to be inserted into the upper end of the lower joint, and the elastic member is surrounded by the inner cylinder, the outer cylinder and the lower joint.
In one embodiment, the inner barrel is repeatedly movable up and down relative to the outer barrel to transition between the second state and the third state
Compared with the prior art, the invention has the advantages that: the sliding sleeve remains in the first state during the lowering of the sliding sleeve with the wellbore. At this time, fluid communication between the inside and outside of the sliding sleeve (inside and outside of the wellbore) is performed without passing through the external passage and the sand control passage. After running in, the sleeve transitions to a second state. Fracturing may then be accomplished by pumping in the well, and fracturing fluid in the well bore may flow through the external passage to the formation. The sleeve may then be transitioned to a third state. At this time, the fluid in the formation can enter the inner cylinder of the sliding sleeve through the external passage and the sand control passage and is transmitted to the ground. Through the arrangement, smooth running of shaft running, fracturing and exploitation can be ensured. Simultaneously, can also effectively avoid sand to enter into in sliding sleeve and the pit shaft at the exploitation in-process.
Drawings
The invention is described in more detail below with reference to the accompanying drawings. Wherein:
FIGS. 1, 3 and 5 respectively show different states of the rail-changing sand control sliding sleeve according to the invention;
FIGS. 2, 4 and 6 are partial enlarged views of the track-changing sand control sleeve of FIGS. 1, 3 and 5, respectively, wherein FIGS. 2, 4 and 6 are developed views of a portion of the outer circumferential surface of the inner barrel;
FIG. 7 shows a cross-sectional view of the rail-changing sand control sliding sleeve of FIG. 1;
fig. 8 and 9 show different embodiments of inner barrels in the rail-changing sand control sliding sleeve.
In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
Detailed Description
The invention will be further explained with reference to the drawings.
FIG. 1 shows a track-changing sand control sliding sleeve 100 according to one embodiment of the present invention. The sliding sleeve 100 in figure 1 is in a first state.
The sliding sleeve 100 includes an outer barrel 120 and an inner barrel 130 disposed within the outer barrel.
As shown in fig. 1 and 7, an outer channel 121 is formed on the outer cylinder 120 through the side wall thereof in the radial direction. A plurality of external passages 121 may be configured on the outer tub 120. The outer passages 121 are evenly spaced apart in the circumferential direction, and adjacent outer passages 121 are spaced apart by an angle δ. As shown in fig. 7, 6 outer passages 121 are circumferentially distributed, and the angle δ between the outer passages 121 is 60 °.
In addition, a sand control passage 131 is formed in the inner tube 130 through the sidewall thereof in the radial direction. A plurality of sand control passages 131 may be constructed on the inner cylinder 130, and the number of the sand control passages 131 is equal to the number of the outer passages 121. The sand control passages 131 are evenly spaced apart in the circumferential direction, and adjacent sand control passages 131 are spaced apart by an angle δ. As shown in fig. 7, 6 sand control passages 131 are circumferentially distributed, and the angle δ between the sand control passages 131 is 60 °. The sand control passage 131 may be configured as a sand control hole 131 as shown in fig. 8, or may be configured as a sand control slit 131 as shown in fig. 9, for example.
In the first state shown in fig. 7, the outer passage 121 is covered by the main portion of the inner barrel 130, so that the outer passage 121 is in a closed state. Accordingly, the sand control passage 131 is locked and covered by the main body portion of the outer tub 120, so that the sand control passage 131 is in a closed state. Thus, as seen in the figure, the sand control channels 131 and the outer channels 121 are alternately arranged in the circumferential direction, with the adjacent sand control channels 131 differing from the outer channels 121 by an angle δ/2. In fig. 7, δ/2 is 30 °.
As shown in FIG. 1, the sliding sleeve 100 further includes an upper connector 110. The upper joint 110 is connected at the upper end of the outer cylinder 120. The lower end of the upper joint 110 is inserted into the outer cylinder 120 and is opposite to the upper end of the inner cylinder 130.
As shown in fig. 1 and 2, an inwardly recessed track groove 132 is formed on the outer side of the inner tube 130. The outer barrel 120 is provided with a mating pin 123 connected thereto and extending radially inwardly relative thereto into the track groove 132. The track groove 132 includes a plurality of groups distributed and connected in the circumferential direction, each group including a first positioning portion and a second positioning portion. For example, fig. 2 shows a first positioning portion 132A and a second positioning portion 132B of the first group. In fig. 6, the second positioning portion 132B of the first group and the first positioning portion 132C of the adjacent second group are shown. For each group, the first positioning portion 132A is axially below the second positioning portion 132B and circumferentially forward in the first rotational direction. The second positioning portion 132B of the first group is axially upward with respect to the first positioning portion of the second group and is circumferentially forward in the first rotational direction with respect to the adjacent group.
The first set of first detents 132A includes a first sloped profile 1321 and a first vertical profile 1322 that is rearward in the first rotational direction relative to the first sloped profile 1321. The first vertical profile 1322 extends along the axial direction. The first inclined profile 1321 is inclined in an axially downward direction away from the first direction of rotation and is connected to the first vertical profile 1322. Thereby, the first positioning portions 132A having an angular shape are formed therebetween. Similarly, the first detent 132C of the second set includes a first vertical profile 1327 and a first sloped profile 1326.
The track slot 132 further includes a second sloped profile 1323 located above the first vertical profile 1322 and the first sloped profile 1321 and connected to the second vertical profile 1324. The second inclined profile 1323 is inclined in an axially downward direction towards the first direction of rotation.
The above-described configuration of the track groove 132 facilitates effective positioning of the mating pin 123 when moving relative to the track groove 132. Even in the event of fluctuations in downhole forces, the movement trajectory of the mating pin 123 is relatively accurate without undesirably moving to an undesirable position.
As shown in fig. 1, a lower joint 150 is connected at the lower end of the outer tub. The upper end 151 of the lower joint 150 is inserted into the outer cylinder 120. A downwardly facing bearing surface 134 is formed on the outside of the inner cylinder 130. The bearing surface 134 is opposite the upper end 151 of the lower joint 150. A resilient member 140 is disposed between the bearing surface 134 and an upper end 151 of the lower joint 150. The elastic member 140 is, for example, a coil spring.
Further, the lower end of the inner cylinder 130 is extended to be inserted into the upper end 151 of the lower joint 150. Thereby, the elastic member 140 is surrounded by the inner cylinder 120, the outer cylinder 130, and the lower joint 150, and the elastic member 140 can be effectively restrained and guided.
An upwardly facing stop surface 152 is formed on the inner side of the lower joint 150, and the stop surface 152 is opposite to the lower end of the inner tube 120.
An engaging spline 133 may be further formed at the inner side of the inner cylinder, which is adapted to engage with an engaging protrusion of a switching mechanism (not shown) to thereby drive the inner cylinder 130 to move, thereby performing a state change of the sliding sleeve 100. It will be appreciated that the cooperation of the switch mechanism with the engagement splines 133 described above allows the inner barrel to be configured with a constant inner diameter (i.e., through diameter). Thus, the whole shaft is beneficial to be a full-drift diameter shaft. That is, a plurality of the sliding sleeves 100 of the present invention may be disposed in a wellbore, and the sliding sleeves 100 may all have the same inner diameter. In theory, the wellbore may include a myriad of such slips 100. That is, the sliding sleeve 100 forms an "endless sliding sleeve". Therefore, the operator can set a corresponding number of sliding sleeves 100 according to actual needs. The full-bore wellbore is beneficial to later-stage gas well operation.
In addition, preferably, the outer cylinder 120 may have a constant inner diameter. Thus, the inner cylinder can be constructed as one body and can be integrally installed into the outer cylinder, making the assembly process more convenient.
The assembly process of the sliding sleeve 100 is, for example: an elastic member 140 is sleeved under the bearing surface 134 of the inner cylinder 130; inserting the inner cylinder 130 sleeved with the elastic member 140 into the outer cylinder 140; the inner cylinder 130 is pressed in place through the upper joint 110, and the upper joint 110 and the outer cylinder 120 are connected together in a threaded connection mode; the lower joint is connected with the outer cylinder 120 by means of screw connection.
In one embodiment, in the first state, the elastic member 140 is in a free state to facilitate assembly and to facilitate the service life of the elastic member 140.
In another embodiment, in the first state, the resilient member 140 is in a compressed state. Therefore, when the inner cylinder 130 needs to be returned by the elasticity of the elastic member 140 in the following, the elastic member 140 can provide more driving force.
The operation of the sliding sleeve 100 will now be described in detail with reference to the accompanying drawings to assist in a further understanding of the invention.
Figure 1 illustrates a first state of the sliding sleeve 100. In this first state, the inner barrel 130 is positioned within the outer barrel 120 and they are secured together by the shear pins 122. The upper end of the inner cylinder 130 abuts against the lower end of the upper joint 110. The outer channels 121 are at the same elevation as the sand control channels 131, but are offset from each other as shown in fig. 7. At this time, the outer space of the outer cylinder and the inner space of the inner cylinder cannot be communicated through the outer passage 121 and the sand control passage 131. The elastic member 140 is in a free state or a pre-compressed state. The lower end of the inner cylinder 130 is spaced apart from the stopper surface 152 of the lower joint 150 by a certain distance. The engagement pin 123 fixed to the outer cylinder 120 is located at the first positioning portion 132A (fig. 2) of the first group of the rail groove 132, and is caught between the first vertical contour 1322 and the first inclined contour 1321.
The sleeve 100 is always in the first condition described above during the lowering of the sleeve 100 into the well with the well bore.
After the sliding sleeve 100 is run in place, an opening tool can be run through the wellbore. The opening tool can be locked in the engaging tooth groove 133 of the inner cylinder 130. Then, the inner cylinder 130 may be driven to move downward relative to the outer cylinder 120 by pressing or pressing an opening tool, thereby causing the sliding sleeve 100 to transition into the second state shown in fig. 3. As the inner cylinder 130 moves downward relative to the outer cylinder 120, the mating pin 123 moves upward along the first vertical profile 1322 into abutment with the second inclined profile 1323. As the inner barrel 130 continues to move downwardly, the engagement between the engagement pin 123 and the second inclined profile 1323 drives rotation of the inner barrel 130 relative to the outer barrel 120 in the first rotational direction. For the mating pin 123, it moves to the second positioning portion 132B along the second inclined profile 1323 (fig. 4). At this time, the sliding sleeve 100 is in the second state.
Since the second positioners 132B are formed by the two vertical profiles 1324, 1325, the relative angular relationship between the mating pin 123 and the rail groove 132, and thus the inner cylinder 130 and the outer cylinder 120, can be effectively restricted here.
As shown in fig. 3, in this second state, the inner cylinder 130 moves downward relative to the outer cylinder 120 until the lower end of the inner cylinder 130 abuts against the stopper surface 152 of the lower joint 140. The resilient member 140 is in a compressed or further compressed state.
In this second state, since the inner cylinder 130 moves downward relative to the outer cylinder 120, the outer passage 121 and the sand control passage 131 are axially offset, preferably also circumferentially offset. The upper end of the inner barrel 130 is below the outer passageway 121 so that the body of the inner barrel 130 no longer blocks the outer passageway 121.
At this time, the outer space of the outer cylinder and the inner space of the inner cylinder are directly communicated through the external passage 121. The operator may perform a fracturing operation by injecting a fracturing fluid at high pressure into the wellbore and directing the fracturing fluid through the external passage 121 into the formation outside the sliding sleeve 100.
After fracturing is finished, the pressure can be stopped or the switch mechanism can be stopped from being pressed down. At this time, the inner cylinder 130 is moved upward with respect to the outer cylinder 120 by the elastic member 140 to a third state shown in fig. 5. During this movement, as the inner barrel 130 moves upwardly relative to the outer barrel 120, the mating pin 123 moves downwardly from the second detent 132B of the first set along the third vertical contour 1325 to abut the first inclined contour 1326 of the first detent 132C of the second set. As the inner barrel 130 continues to move upward, the inner barrel 130 is driven to rotate in a first direction through an angle relative to the outer barrel 120 under the interaction between the mating pin 123 and the first sloped profile 1326. At this point, the mating pin 123 reaches the position shown in fig. 6, and is captured between the first inclined profile 1326 and the first vertical profile 1327.
It will be appreciated that the above-mentioned upwardly moving driving force may also comprise a force to lift the opening tool and/or a jacking force created upon drainage of the lower zone, etc., as desired.
In this third state, the sand control passage 131 on the inner cylinder 130 is opposed to the outer passage 121 on the outer cylinder 120 and communicates with each other. The outer space of the outer cylinder and the inner space of the inner cylinder are communicated through the sand control passage 131 and the outer passage 121. Gas and liquid in the formation may flow into the wellbore through the outer passage 121 and the sand control passage 131 and to the surface for production operations.
It will be appreciated that after reaching the third state, the switch mechanism may be lifted out of the wellbore. Alternatively, the switch mechanism may be constructed in a soluble structure so as to be melted and disappear when a specific fluid is injected into the well.
In addition, since the above-mentioned rail groove 132 is formed over the entire circumference of the inner cylinder 130, after the sliding sleeve 100 is first brought to the third state, the above-mentioned process can be repeated by depressing the inner cylinder 130 again so that the sliding sleeve 100 is transferred to the second state. That is, the sliding sleeve 100 can be repeatedly transitioned between the second state and the third state by repeated operations. For example, after a period of production operations, sand control channels 131 are inevitably subject to sand build-up. With the above arrangement, an additional switch mechanism can be lowered at this time to shift the sliding sleeve 100 to the second state. By this operation, the accumulated sand is advantageously discharged. When the sleeve 100 is returned to the third position again, the wellbore can be run for efficient production operations.
In one embodiment, the engagement pin 123 may be engaged with the track groove 132 such that the inner cylinder 130 is rotated by an angle δ in the first rotational direction with respect to the outer cylinder 120 when passing from the first state to the second state1. The engagement pin 123 may be engaged with the track groove 132 such that the inner cylinder 130 is rotated by an angle δ in the first rotational direction with respect to the outer cylinder 120 when passing from the second state to the third state2. The relationship between the two rotation angles is delta1+δ2δ/2. For example, in the case where δ is 60 °, the inner cylinder 130 rotates by 15 °, for example, from the first state to the second state, and the inner cylinder 130 rotates by 15 ° again from the second state to the third state. It should be understood that the inner barrel 130 can also be rotated a smaller angle and then a larger angle, or rotated a larger angle and then a smaller angle, for example, as long as the sum of the angles of successive rotations is δ/2. This design is effectiveThe sand control effect, and the action of the sliding sleeve 100 is simple and convenient to implement.
In another embodiment, the engagement pin 123 can engage with the track groove 132 to rotate the inner cylinder 130 relative to the outer cylinder 120 in the first rotational direction by an angle n δ when going from the first state to the second state, where n is a positive integer, preferably 1. The engagement pin 123 may be engaged with the track groove 132 such that the inner cylinder 130 is rotated in the first rotational direction by an angle δ/2 with respect to the outer cylinder 120 when passing from the second state to the third state. For example, in the case where δ is 60 °, the inner tube 130 is rotated by a large angle of 60 ° when going from the first state to the second state, and the inner tube 130 is rotated by a small angle of 30 ° when going from the second state to the third state.
In the above embodiment, the inner cylinder is rotated by a predetermined angle with respect to the outer cylinder by special design in accordance with the positional relationship between the pin 123 and the track groove 132. As the inner cylinder 130 moves downward relative to the outer cylinder 120, it simultaneously rotates by an angle of n δ relative to the outer cylinder 120. Then, the inner cylinder 130 moves upward with respect to the outer cylinder 120 while rotating by an angle of δ/2 with respect to the outer cylinder 120 by the elastic member 140. Therefore, the inner cylinder 130 can rotate to an accurate sand prevention position relative to the outer cylinder, an effective sand prevention effect is achieved, and the sliding sleeve 100 is simple in action and convenient to implement. In addition, the design has higher working stability and is beneficial to ensuring the smooth operation of the underground operation.
With the sliding sleeve 100 of the present invention, it is possible to change the sliding sleeve 100 between the first state, the second state and the third state by a simple and convenient operation. For example, as described above, it may transition from the first state to the second state by holding down pressure, and transition to the third state by stopping holding down pressure. This greatly reduces the complexity of the operation process.
In addition, the structure of the sliding sleeve 100 can realize effective and reliable sand prevention, thereby effectively performing sand prevention mining work in a long time and having long service life.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. A rail-changing sand control sliding sleeve comprises:
an outer cylinder on which an outer passage penetrating a sidewall of the outer cylinder in a radial direction is configured;
the inner cylinder is sleeved in the outer cylinder and is provided with a sand prevention channel which penetrates through the side wall of the inner cylinder in the radial direction;
in a first state, an external channel of the outer cylinder and a sand prevention channel of the inner cylinder are staggered in the circumferential direction, so that an external space of the outer cylinder and an internal space of the inner cylinder cannot be communicated through the external channel and the sand prevention channel;
in a second state, the inner cylinder moves downwards relative to the outer cylinder and rotates in the circumferential direction until the inner cylinder does not overlap with the external channel, so that the outer cylinder space and the inner cylinder space can be directly communicated through the external channel;
in a third state, the inner cylinder moves upward relative to the outer cylinder and rotates in the circumferential direction until the external passage of the outer cylinder is aligned with the sand control passage of the inner cylinder, so that the outer space of the outer cylinder and the inner space of the inner cylinder can be communicated through the external passage and the sand control passage.
2. The rail-changing sand control sliding sleeve according to claim 1, wherein a plurality of external passages are configured on the outer cylinder, the plurality of external passages are uniformly distributed in the circumferential direction and are spaced apart from each other by an angle δ, and a corresponding plurality of sand control passages are configured on the inner cylinder, the plurality of sand control passages are uniformly distributed in the circumferential direction and are spaced apart from each other by an angle δ;
in a first condition, the sand control passages are circumferentially offset from adjacent outer passages by an angle delta/2,
rotating the inner barrel relative to the outer barrel in a first rotation direction by an angle n delta in a process from a first state to a second state, wherein n is a positive integer,
during the process from the second state to the third state, the inner cylinder rotates relative to the outer cylinder by an angle delta/2 in the first rotation direction.
3. The rail-changing sand control sliding sleeve according to claim 2, wherein the value of n is 1.
4. The rail-changing sand control sliding sleeve according to claim 1, wherein a plurality of external passages are configured on the outer cylinder, the plurality of external passages are uniformly distributed in the circumferential direction and are spaced apart from each other by an angle δ, and a corresponding plurality of sand control passages are configured on the inner cylinder, the plurality of sand control passages are uniformly distributed in the circumferential direction and are spaced apart from each other by an angle δ;
in a first condition, the sand control passages are circumferentially offset from adjacent outer passages by an angle delta/2,
during the process from the first state to the second state, the inner cylinder rotates relative to the outer cylinder by an angle delta along the first rotation direction1，
During the process from the second state to the third state, the inner cylinder rotates relative to the outer cylinder by an angle delta in the first rotation direction2，
Wherein, delta1+δ2＝δ/2。
5. The rail-changing sand control sliding sleeve according to any one of claims 1 to 4, wherein a track groove is configured on an outer side wall of the inner cylinder, the track groove comprises a first positioning portion and a corresponding second positioning portion, the second positioning portion is axially upward relative to the first positioning portion and is circumferentially rearward in a first rotating direction,
a fitting pin extending inward into the track groove with respect to the outer cylinder is fitted on the outer cylinder,
the track groove includes a plurality of sets of first positioning portions and corresponding second positioning portions that circumferentially surround the inner tube, wherein the second positioning portions in a first set are connected to the first positioning portions in an adjacent second set,
the fitting pin moves from the first positioning portion of the first group to the second positioning portion of the first group when transitioning from the first state to the second state,
the fitting pin moves from the second positioning portion of the first group to the first positioning portion of the second group when transitioning from the second state to the third state.
6. The derailment sand control sleeve of claim 5, wherein the first detent includes a first sloped profile and a first vertical profile rearward relative to the first sloped profile in a first rotational direction, the first vertical profile extending in an axial direction, the first sloped profile sloping away from the first rotational direction in an axially downward direction, the mating pin movable between the first sloped profile and the first vertical profile to be captured within the first detent;
the second positioning portion includes a second vertical profile and a third vertical profile extending in the axial direction and spaced apart from each other, the second vertical profile being forward relative to the third vertical profile in the first rotational direction, the mating pin being movable between the second vertical profile and the third vertical profile to be caught within the second positioning portion;
the second vertical contour and the third vertical contour of the second positioning portion of the first group are located above the first inclined contour of the first positioning portion of the second group, and when the second state is switched to the third state, the engaging pin engages with the first inclined contour to drive the inner cylinder to rotate.
7. The rail changing sand control sleeve of claim 6, wherein said rail groove further comprises a second sloped profile above and contiguous with said first vertical profile, said second sloped profile sloped in an axially downward direction toward said first rotational direction,
the engagement pin engages the second sloped profile to drive rotation of the inner barrel when transitioning from the first state to the second state.
8. The rail changing sand control sliding sleeve according to any one of claims 1 to 7, wherein a lower joint is connected at a lower end of the outer cylinder, an upper end of the lower joint is inserted into the outer cylinder, a downwardly facing bearing surface is configured at an outer side of the inner cylinder, the bearing surface is opposite to an upper end of the lower joint, and an elastic member is disposed between the bearing surface and the upper end of the lower joint, the elastic member is configured to be compressed when passing from a first state to a second state, and to be restored when passing from the second state to a third state to drive the inner cylinder to move upward relative to the outer cylinder.
9. The rail-changing sand control sliding sleeve according to claim 8, wherein the lower end of the inner cylinder extends to be inserted into the upper end of the lower joint, and the elastic member is surrounded by the inner cylinder, the outer cylinder and the lower joint.
10. The rail changing sand control sleeve according to any one of claims 1 to 9, wherein the inner barrel is repeatedly movable up and down relative to the outer barrel to transition between the second state and the third state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011227145.7A CN114439418A (en) | 2020-11-06 | 2020-11-06 | Rail-changing type sand-proof sliding sleeve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011227145.7A CN114439418A (en) | 2020-11-06 | 2020-11-06 | Rail-changing type sand-proof sliding sleeve |
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| Publication Number | Publication Date |
|---|---|
| CN114439418A true CN114439418A (en) | 2022-05-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011227145.7A Pending CN114439418A (en) | 2020-11-06 | 2020-11-06 | Rail-changing type sand-proof sliding sleeve |
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Citations (4)
| 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 |
| CN205503092U (en) * | 2016-01-20 | 2016-08-24 | 中国石油化工股份有限公司 | Full latus rectum switch sliding sleeve of locking -type is separated in rotation |
| US20180320488A1 (en) * | 2017-05-05 | 2018-11-08 | Sc Asset Corporation | System and related methods for fracking and completing a well which flowably installs sand screens for sand control |
| CN109798097A (en) * | 2019-04-08 | 2019-05-24 | 西华大学 | It is a kind of to use frac-sand jet infinitely |
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2020
- 2020-11-06 CN CN202011227145.7A patent/CN114439418A/en active Pending
Patent Citations (4)
| 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 |
| CN205503092U (en) * | 2016-01-20 | 2016-08-24 | 中国石油化工股份有限公司 | Full latus rectum switch sliding sleeve of locking -type is separated in rotation |
| US20180320488A1 (en) * | 2017-05-05 | 2018-11-08 | Sc Asset Corporation | System and related methods for fracking and completing a well which flowably installs sand screens for sand control |
| CN109798097A (en) * | 2019-04-08 | 2019-05-24 | 西华大学 | It is a kind of to use frac-sand jet infinitely |
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