CN118029958A - Infinite sand control fracturing sliding sleeve - Google Patents
Infinite sand control fracturing sliding sleeve Download PDFInfo
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- CN118029958A CN118029958A CN202410292311.3A CN202410292311A CN118029958A CN 118029958 A CN118029958 A CN 118029958A CN 202410292311 A CN202410292311 A CN 202410292311A CN 118029958 A CN118029958 A CN 118029958A
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- sand
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- fracturing
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- 239000004576 sand Substances 0.000 title claims abstract description 88
- 230000000903 blocking effect Effects 0.000 claims abstract description 38
- 238000005488 sandblasting Methods 0.000 claims abstract description 25
- 230000009471 action Effects 0.000 claims description 8
- 239000011435 rock Substances 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000005086 pumping Methods 0.000 description 4
- 210000000078 claw Anatomy 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000003079 shale oil Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Landscapes
- Earth Drilling (AREA)
Abstract
The invention discloses an infinite sand control fracturing sliding sleeve, and relates to the technical field of fracturing. The fracturing sliding sleeve comprises: the outer cylinder is provided with a sand blasting fracturing hole, an inner cylinder is arranged in the outer cylinder, and a clamping groove or a clamping tooth is arranged on the inner surface of the inner cylinder; the sand control clamping cylinder is sequentially provided with a sliding ball seat, a sand blocking net and a positioning clamping cylinder from top to bottom, and the positioning clamping cylinder is provided with clamping teeth or clamping grooves; when the clamping teeth are matched with the clamping grooves, or when the clamping grooves are matched with the clamping teeth, the positioning clamping cylinder can be fixed by the inner cylinder; the sliding ball seat is provided with a soluble throwing ball; one end of the sand blocking net is fixedly connected with the sliding ball seat, and the other end of the sand blocking net is in sliding connection with the positioning clamping cylinder through an elastic piece. The infinite-stage sand control fracturing sliding sleeve disclosed by the invention not only can realize infinite-stage and full-drift-diameter fracturing, but also can enable the sand blocking net to rapidly fracture Kong Dangzhu by sand blasting after the fracturing is finished, so that external sand and rock scraps are prevented from entering the inside of the sliding sleeve, and the possibility of sand blocking is greatly reduced.
Description
Technical Field
The invention relates to the technical field of fracturing, in particular to an infinite sand control fracturing sliding sleeve.
Background
The horizontal well multistage staged fracturing process is a key point for shale oil and gas development. The pumping bridge plug perforation combined staged fracturing technology, the multistage sliding sleeve packer staged fracturing technology and the hydraulic jet staged fracturing technology are used as three main flow technology series, so that a powerful technical support is provided for increasing the transformation effect of shale reservoirs and effectively utilizing the shale reservoirs in a large scale.
At present, the main staged fracturing mode of shale gas at home and abroad is pumping bridge plug perforation combination so as to meet the construction requirements of large liquid amount and large discharge capacity. The number of pumping perforation fracturing sections is unlimited, large-scale sand fracturing can be performed, but the construction time is long, and the ground cross operation is complex; the on-site single-stage pumping perforation time is generally 3-4 hours, and when the tool encounters a cable fracture and tool well falling accident caused by a clamp Shi Yifa, synchronous fracturing and zip-fastener type fracturing cannot be smoothly implemented, so that the fracturing construction efficiency is greatly influenced. The multistage sliding sleeve packer staged fracturing technology is characterized in that a sliding sleeve tool is put into the horizontal section along with a sleeve during well cementation, a sliding sleeve is opened through dragging or ball throwing of a continuous oil pipe to carry out each stage of fracturing, however, due to the existence of ball seats, the diameters of the sliding sleeves are sequentially reduced from top to bottom, and the development of oil gas is seriously influenced.
For some defects of the existing sliding sleeve, the prior art tries to develop some infinite-stage full-drift-diameter fracturing sliding sleeves, for example, chinese patent CN108798597A discloses an infinite-stage full-drift-diameter sliding sleeve, which is provided with a ball throwing sliding sleeve and a switch sleeve which are mutually separated, an elastic claw is arranged on the ball throwing sliding sleeve, a clamping groove is arranged on the switch sleeve, when the elastic claw is matched with the clamping groove, the ball throwing sliding sleeve is fixed by the switch sliding sleeve, and when the multistage sliding sleeves are connected in series, full-drift-diameter fracturing can be realized by adjusting the size of the elastic claw. However, in this device, when the switch slide is opened, the drainage hole directly communicates with the inside of the outer cylinder, and a large amount of sand in the reservoir may enter the inside of the outer cylinder through the drainage hole, resulting in sand blockage in the well.
Disclosure of Invention
In order to solve at least one of the problems, the invention provides an infinite sand control fracturing sliding sleeve.
The technical scheme of the invention is as follows: an infinite-stage sand control fracturing sleeve comprising:
The outer barrel is provided with a sand blasting fracturing hole, an inner barrel is arranged in the outer barrel, when the outer barrel and the inner barrel are in pin joint, the inner barrel prevents the sand blasting fracturing hole from being communicated with the inside and the outside of the outer barrel, and the inner surface of the inner barrel is provided with a clamping groove or a clamping tooth;
The sand control clamping cylinder is provided with a sliding ball seat, a sand blocking net and a positioning clamping cylinder in sequence from top to bottom, and the positioning clamping cylinder is provided with clamping teeth or clamping grooves; when the clamping teeth are matched with the clamping grooves or the clamping grooves are matched with the clamping teeth, the positioning clamping cylinder can be fixed by the inner cylinder; the sliding ball seat is provided with a soluble throwing ball; one end of the sand blocking net is fixedly connected with the sliding ball seat, and the other end of the sand blocking net is in sliding connection with the positioning clamping cylinder through an elastic piece;
when the soluble ball is dissolved, the sand blocking net is far away from the positioning clamping cylinder under the action of the elastic piece, and external sand is prevented from entering the sliding sleeve through the sand blasting fracturing hole.
The elastic piece comprises a piston cylinder arranged in the positioning clamp cylinder, one end of the piston cylinder is open and faces the sand blocking net, a piston is arranged at one end, close to the piston cylinder, of the sand blocking net, and the piston is arranged in the piston cylinder.
Further, the piston cylinder is filled with pressure gas.
Further, one end of the sand blocking net, which is close to the piston cylinder, is provided with a connecting plate, and the other end of the connecting plate is provided with a piston.
The invention has the advantages that the upper connector and the lower connector are respectively arranged at the two ends of the outer cylinder.
According to one embodiment of the invention, when the plurality of fracturing sliding sleeves are connected in series, the sizes of the clamping teeth or the clamping grooves on the plurality of positioning clamping cylinders are sequentially increased.
The beneficial effects are that: the infinite-stage sand control fracturing sliding sleeve disclosed by the invention not only can realize infinite-stage and full-drift-diameter fracturing, but also can enable the sand blocking net to rapidly fracture Kong Dangzhu by sand blasting after the fracturing is finished, so that external sand and rock scraps are prevented from entering the inside of the sliding sleeve, and the possibility of sand blocking is greatly reduced.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an infinite stage sand control fracturing sleeve according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a structure of an infinite stage sand control fracturing sleeve according to an embodiment of the present invention when compressed;
FIG. 3 is a schematic diagram of a structure of an infinite stage sand control fracturing sleeve after dissolution of a soluble shot in the sleeve according to an embodiment of the present invention;
fig. 4 is an enlarged schematic view of the portion a in fig. 1.
In the figure, 1 is an upper joint, 2 is an outer cylinder, 3 is a lower joint, 4 is a sliding ball seat, 5 is a soluble ball throwing, 6 is a sand blocking net, 7 is a positioning clamping cylinder, 8 is a piston cylinder, 9 is a clamping groove, 10 is a sand blasting fracturing hole, 11 is a pin, 12 is an inner cylinder, 601 is a connecting plate, and 602 is a piston.
Detailed Description
The following detailed description of the invention will be clearly and fully described in connection with the examples and the accompanying drawings, in which it is evident that the examples described are only some, but not all embodiments of the invention.
An infinite-stage sand control fracturing sleeve comprising:
the outer cylinder 2 is provided with a sand blasting fracturing hole 10, an inner cylinder 12 is arranged in the outer cylinder 2, when the outer cylinder 2 and the inner cylinder 12 are in pin joint, the inner cylinder 12 prevents the sand blasting fracturing hole 10 from being communicated with the inside and the outside of the outer cylinder 2, and the inner surface of the inner cylinder 12 is provided with a clamping groove 9 or a clamping tooth;
The sand control clamping cylinder is provided with a sliding ball seat 4, a sand blocking net 6 and a positioning clamping cylinder 7 in sequence from top to bottom, and the positioning clamping cylinder 7 is provided with clamping teeth or clamping grooves; when the clamping teeth are matched with the clamping grooves 9 or when the clamping grooves are matched with the clamping teeth, the positioning clamping cylinder 7 can be fixed by the inner cylinder 12; the sliding ball seat 4 is provided with a soluble ball throwing 5; one end of the sand blocking net 6 is fixedly connected with the sliding ball seat 4, and the other end of the sand blocking net is in sliding connection with the positioning clamping cylinder 7 through an elastic piece;
when the soluble throwing ball 5 is dissolved, the sand blocking net 6 is far away from the positioning clamping cylinder 7 under the action of the elastic piece, and external sand is prevented from entering the sliding sleeve through the sand blasting fracturing hole 10.
Specifically, as shown in fig. 1 to 4, the dashed line in fig. 1 to 3 is a separation line between a cross-section part and a non-cross-section part of the sliding sleeve, wherein the upper part of the dashed line is a schematic structural diagram of the inside of the sliding sleeve, and the lower part of the dashed line is a schematic structural diagram of the outside of the sliding sleeve, which is a conventional drawing auxiliary line in the art. In this embodiment, the outer cylinder 2 and the inner cylinder 12 have similar structures to those of a conventional sliding sleeve: the upper portion of urceolus 2 is provided with sandblast fracturing hole 10, and the outer wall of inner tube 12 is hugged closely urceolus 2 inner wall and is carried out sliding seal to outer barrel 2 inner wall, before fracturing, inner tube 12 blocks sandblast fracturing hole 10 for the inside and outside of urceolus 2 can not be because sandblast fracturing hole 10 intercommunication, in order to avoid outside debris to get into urceolus 2 inside through sandblast fracturing hole 10.
Similar to the conventional infinite-stage fracturing sliding sleeve, the inner surface of the inner barrel 12 is provided with corresponding clamping grooves 9 or clamping teeth, and from the aspect of convenience of practical application, the clamping grooves 9 are arranged on the inner surface of the inner barrel 12, so that the sand-preventing clamping barrel can move in a shaft and the unmatched fracturing sliding sleeve, and therefore, in the embodiment, the clamping grooves 9 are arranged on the inner surface of the inner barrel 12, and clamping teeth are arranged on the positioning clamping barrel 7. In fact, the inner cylinder 12 is also named as a switch cylinder in the prior art. In order to enable the sliding sleeve to realize infinite-level full penetration, a corresponding key is also commonly arranged in the prior art, namely a positioning clamping cylinder 7 in the embodiment of the invention: when the clamping teeth on the positioning clamping cylinder 7 are completely matched with the clamping grooves 9 on the inner cylinder 12, the clamping teeth are embedded into the clamping grooves 9, so that the positioning clamping cylinder 7 is fixed by the inner cylinder 12; when the clamping teeth of the positioning clamping cylinder 7 are not matched with the clamping grooves 9 on the inner cylinder 12, the positioning clamping cylinder 7 and the inner cylinder 12 can still move relatively. At this time, the pin 11 between the inner cylinder 12 and the outer cylinder 2 is cut off under the action of pressure, so that the inner cylinder 12 is driven to move downwards, the sand blasting fracturing holes 10 shielded by the inner cylinder 12 are exposed, the inner part and the outer part of the outer cylinder 2 are communicated through the sand blasting fracturing holes 10, and fracturing can be started.
Of course, it is clear to those skilled in the art that when the multi-stage sliding sleeves are connected in series, the sizes of the clamping teeth on the positioning clamping cylinder 7 are sequentially increased, so as to avoid the small-sized clamping teeth from sinking into the clamping grooves 9 of the upper sliding sleeve. These structures are conventional in the art, and thus the specific structures thereof are not described herein.
After the fracturing sliding sleeve cuts off the pin 11, the sand blasting fracturing hole 10 is opened, and the fracturing fluid is sprayed outwards through the sand blasting fracturing hole 10 under the action of high pressure in the early stage of fracturing. However, when the fracturing process is finished, the pressure in the well is reduced, external rock debris, sand, propping agent and other particles can enter the sliding sleeve through the sand blasting fracturing holes 10, and when the particles are excessive, the phenomenon of sand blockage of the whole well shaft can be caused, so that the subsequent operation is seriously influenced. To solve this problem, in this embodiment, a sand screen 6 is further provided between the slide ball seat 4 and the retainer clip 7.
In this embodiment, in order to fully exert the function of the sand blocking net 6, it is required that the sand blocking net 6 cannot block the solid phase in the fracturing fluid when fracturing is performed; and after fracturing, the sand blocking net 6 can ascend for a distance, so that the sand blocking net 6 can just block the sand blasting fracturing holes 10, and external sand, rock fragments and the like are prevented from entering the inside of the sliding sleeve through the sand blasting fracturing holes 10.
In order to realize the functions, an elastic piece is arranged between the sand blocking net 6 and the positioning clamping cylinder 7 to realize the functions: the sand blocking net 6 is in sliding connection with the positioning clamping cylinder 7, when the sand blocking net 6 is subjected to large external force, the sand blocking net 6 descends and slides relative to the positioning clamping cylinder 7, and the sand blocking net 6 cannot influence the normal operation of the sand blasting fracturing holes 10 in the process; when the external force applied to the sand blocking net 6 is smaller than the elastic force of the elastic piece, the sand blocking net 6 returns to the original position under the action of the elastic piece, and the sand blasting fracturing holes 10 are blocked. There are many elastic members that fulfil this function, such as conventional springs and the like. However, springs tend to have a reduced spring back after prolonged stress and are prone to corrosion in a downhole environment. For this reason, the inventors have provided an elastic member which is not easily affected by the environment in the present embodiment.
The elastic piece comprises a piston cylinder 8 and a piston 602, wherein the piston cylinder 8 is arranged in the positioning clamp cylinder 7, the piston 602 is arranged at one end, close to the piston cylinder 8, of the sand blocking net 6, and the piston 602 is arranged in the piston cylinder 8. The sand screen 6 can slide relative to the positioning clip 7 by means of the piston cylinder 8 and the piston 602. In order to provide the piston cylinder 8 with a certain elasticity, the interior of the piston cylinder 8 can be filled with corresponding pressure gases, the pressure of which can be determined from the pressure in the shaft at the time of actual production: when the pressure gas is compressed by the piston 602, the maximum pressure in the piston cylinder 8 is less than the cut-off pressure of the pin 11; after the soluble throwing ball 5 is dissolved, the pressure in the piston cylinder 8 can enable the whole sand blocking net 6 and the sliding ball seat 4 to ascend, so that the sand blocking net 6 blocks the sand blasting fracturing holes 10. For the kind of the pressure gas, it may be air or an inert gas, but in view of corrosion resistance of the material, it is generally possible to supply air as an inert gas such as nitrogen.
It will be appreciated by those skilled in the art that in order to facilitate the connection of the sand screen 6 and the piston 602, a corresponding connection plate 601 is provided between the sand screen 6 and the piston 602, the thickness of the connection plate 601 being the same as the thickness of the sand screen 6; meanwhile, in order to reduce the amount of sundries (such as sand) entering the piston cylinder 8, a baffle plate with an opening is further arranged at the upper part of the opening of the piston cylinder 8, and when the width of the opening of the baffle plate is the same as the thickness of the connecting plate 601, the connecting plate 601 and the sand blocking net 6 can just enter the piston cylinder 8, and a large amount of sundries are blocked outside the piston cylinder 8.
After the soluble throwing ball 5 and the whole sand control clamping cylinder are thrown into a shaft, the soluble throwing ball 5 and the sand control clamping cylinder move in the shaft until the sand control clamping cylinder and the inner cylinder 12 are matched and fixed, pressurizing is started, under the action of pressure, the soluble throwing ball 5 descends, the sand control clamping cylinder descends under the action of an elastic piece, the pressure is continuously increased, the pin 11 is sheared off, the whole inner cylinder 12 and the positioning clamping cylinder 7 descend, and the sand blasting fracturing hole 10 is exposed, so that the inside and the outside of the sliding sleeve are communicated. Before soluble throwing ball 5 is undissolved, the pressure of fracturing fluid makes the elastic component can not rebound, and after fracturing, soluble throwing ball 5 dissolves, and the sliding sleeve communicates from top to bottom, keeps off sand net 6 and the pressure that sliding ball seat 4 received diminish rapidly, and under the effect of elastic component, keeps off sand net 6 and sliding ball seat 4 and goes up, keeps off sand net 6 and blocks sand blasting fracturing hole 10, prevents impurity such as outside grit, detritus to get into inside the sliding sleeve.
In order to facilitate the connection of the infinite sand control fracturing sliding sleeve and the drilling tool, the two ends of the outer cylinder 2 are also provided with an upper joint 1 and a lower joint 3, which belong to common parts in the field. As will be appreciated by those skilled in the art, for the upper fitting 1, it is disposed at one end of the outer barrel 2 near the soluble pitch 5, and the lower fitting 3 is disposed at one end of the outer barrel 2 remote from the soluble pitch 5 to achieve a fracturing function.
The present invention is not limited to the above-mentioned embodiments, but is intended to be limited to the following embodiments, and any modifications, equivalents and modifications can be made to the above-mentioned embodiments without departing from the scope of the invention.
Claims (6)
1. An infinite-stage sand control fracturing sleeve, comprising:
The outer barrel is provided with a sand blasting fracturing hole, an inner barrel is arranged in the outer barrel, when the outer barrel and the inner barrel are in pin joint, the inner barrel prevents the sand blasting fracturing hole from being communicated with the inside and the outside of the outer barrel, and the inner surface of the inner barrel is provided with a clamping groove or a clamping tooth;
The sand control clamping cylinder is provided with a sliding ball seat, a sand blocking net and a positioning clamping cylinder in sequence from top to bottom, and the positioning clamping cylinder is provided with clamping teeth or clamping grooves; when the clamping teeth are matched with the clamping grooves or the clamping grooves are matched with the clamping teeth, the positioning clamping cylinder can be fixed by the inner cylinder; the sliding ball seat is provided with a soluble throwing ball; one end of the sand blocking net is fixedly connected with the sliding ball seat, and the other end of the sand blocking net is in sliding connection with the positioning clamping cylinder through an elastic piece;
when the soluble ball is dissolved, the sand blocking net is far away from the positioning clamping cylinder under the action of the elastic piece, and external sand is prevented from entering the sliding sleeve through the sand blasting fracturing hole.
2. The infinite stage sand control fracturing sleeve of claim 1 wherein said elastomeric element comprises a piston cylinder disposed within said locating clip cylinder, said piston cylinder having an opening at one end and facing said sand screen, said sand screen having a piston disposed at an end thereof adjacent said piston cylinder, and said piston disposed within said piston cylinder.
3. The infinite stage sand control fracturing sleeve of claim 2 wherein said piston cylinder is filled with a pressurized gas.
4. The infinite stage sand control fracturing sleeve of claim 2 wherein one end of said sand screen adjacent said piston cylinder is provided with a connecting plate and the other end of said connecting plate is provided with a piston.
5. The infinite stage sand control fracturing sleeve of claim 1 wherein said outer barrel has upper and lower tabs at each end.
6. The infinite stage sand control fracturing sleeve of claim 1 wherein the sizes of the clamping teeth or clamping grooves on a plurality of said locating clamp cylinders increase in sequence when a plurality of fracturing sleeves are connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410292311.3A CN118029958A (en) | 2024-03-14 | 2024-03-14 | Infinite sand control fracturing sliding sleeve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410292311.3A CN118029958A (en) | 2024-03-14 | 2024-03-14 | Infinite sand control fracturing sliding sleeve |
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| Publication Number | Publication Date |
|---|---|
| CN118029958A true CN118029958A (en) | 2024-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410292311.3A Pending CN118029958A (en) | 2024-03-14 | 2024-03-14 | Infinite sand control fracturing sliding sleeve |
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| Country | Link |
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| CN (1) | CN118029958A (en) |
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2024
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