CN106593351B - Well cementation sliding sleeve - Google Patents
Well cementation sliding sleeve Download PDFInfo
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- CN106593351B CN106593351B CN201611144427.4A CN201611144427A CN106593351B CN 106593351 B CN106593351 B CN 106593351B CN 201611144427 A CN201611144427 A CN 201611144427A CN 106593351 B CN106593351 B CN 106593351B
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- 239000012530 fluid Substances 0.000 claims description 53
- 238000003860 storage Methods 0.000 claims description 35
- 239000007788 liquid Substances 0.000 claims description 24
- 238000007789 sealing Methods 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 230000000712 assembly Effects 0.000 claims description 3
- 238000000429 assembly Methods 0.000 claims description 3
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- 230000008901 benefit Effects 0.000 abstract description 4
- 230000032683 aging Effects 0.000 abstract description 2
- 210000002445 nipple Anatomy 0.000 description 64
- 239000003921 oil Substances 0.000 description 35
- 239000010720 hydraulic oil Substances 0.000 description 17
- 238000000034 method Methods 0.000 description 7
- 230000001276 controlling effect Effects 0.000 description 6
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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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Valve Housings (AREA)
Abstract
The invention discloses a well cementation sliding sleeve, and relates to the technical field of shale gas exploitation. The well cementation sliding sleeve provided by the invention is of a hollow tubular structure and comprises an upper joint, an electrical short section, a hydraulic control short section, a reversing short section, a sliding sleeve short section and a lower joint which are sequentially connected along the axial direction. The sliding sleeve outer barrel, the sliding sleeve inner barrel and the sliding sleeve are arranged in the sliding sleeve short section, a first fracturing hole is formed in the side wall of the sliding sleeve, a second fracturing hole is formed in the side wall of the sliding sleeve outer barrel, and a third fracturing hole opposite to the second fracturing hole is formed in the side wall of the sliding sleeve inner barrel. The electric short section is controlled through radio, so that the hydraulic control short section and the reversing short section are controlled to drive the sliding sleeve to move left and right in the sliding sleeve cavity, and when three fracturing holes are aligned, fracturing operation can be performed. The well cementation sliding sleeve provided by the invention has the advantages of accurate operation and fast aging, simplifies the fracturing operation, can be repeatedly opened, and realizes the efficient development of unconventional oil and gas reservoirs such as shale gas.
Description
Technical Field
The invention relates to the field of shale gas exploitation, in particular to a well cementation sliding sleeve.
Background
With the continuous and deep exploration and development of oil and gas reservoirs, the implementation of staged fracturing modification of horizontal wells becomes a necessary means for the effective development of unconventional gas reservoirs such as shale gas. At present, the horizontal well staged fracturing technology of shale gas wells mainly comprises a fast drilling bridge plug and clustering perforation combined process: dividing a horizontal well section into a plurality of sections, performing perforation treatment on a casing pipe at the foremost end, and then fracturing; and then, a fast drilling bridge plug is put in to plug the previous section, and then the adjacent sections are subjected to clustering perforation and fracturing construction, so that the staged fracturing of the whole horizontal well is completed in sequence. However, during the volume fracturing process of the shale gas horizontal well, the multi-stage fracturing operation can cause the stratum around the casing to be dislocated, compress the casing and cause the drift diameter of the casing to be deformed. Therefore, the situations that a bridge plug cannot be smoothly put in the construction process and the like are caused, and the smooth operation and implementation effect are greatly influenced, so that the development of a novel staged fracturing modification tool is very important.
In the prior art, patent document CN202125290U discloses an intelligent sliding sleeve in a selective switch sliding sleeve assembly, and the invention utilizes a special switch tool for running in to open and close the intelligent sliding sleeve. However, the scheme needs to be operated by a coiled tubing with a switch tool, the operation is complex, and the construction period is long. The patent document CN203452763U discloses an intelligent sliding sleeve for infinite-stage segmental transformation of a horizontal well, and the invention utilizes a piston to control the self-generation of a ball seat, and opens and closes the intelligent sliding sleeve. But this scheme still need accomplish through the bowling, can not realize reciprocating of sliding sleeve and open, consequently has once fracturing and is difficult to reach preset standard, and multiple fracturing leads to the loaded down with trivial details problem of construction.
In the process of implementing the invention, the inventor finds that the prior art has at least the following problems:
the intelligent sliding sleeve applicable to the shale gas staged fracturing construction process in the prior art is complex in operation, and efficient development of unconventional oil and gas reservoirs such as shale gas is difficult to realize.
Disclosure of Invention
In order to overcome the defects of the prior art, the embodiment of the invention provides the well cementation sliding sleeve which is simple to operate. The technical scheme is as follows:
a well cementation sliding sleeve is a hollow tubular structure and comprises an upper joint, an electrical short section, a hydraulic control short section, a reversing short section, a sliding sleeve short section and a lower joint which are sequentially connected along the axial direction; the sliding sleeve short section comprises: the sliding sleeve comprises a sliding sleeve outer cylinder and a sliding sleeve inner cylinder, wherein an annular sliding sleeve cavity is formed between the sliding sleeve outer cylinder and the sliding sleeve inner cylinder; a sliding sleeve is arranged in the sliding sleeve cavity; a first fracturing hole is formed in the side wall of the sliding sleeve, a second fracturing hole is formed in the side wall of the outer sliding sleeve barrel, and a third fracturing hole opposite to the second fracturing hole is formed in the side wall of the inner sliding sleeve barrel; the electric short section is used for receiving signals and controlling the hydraulic control short section and the reversing short section to work; the hydraulic control short section is matched with the reversing short section and used for driving the sliding sleeve to move left and right in the sliding sleeve cavity; when the first fracturing hole is opposite to and communicated with the second fracturing hole and the third fracturing hole, the sliding sleeve short section is in an open state; and when the first fracturing hole is staggered with the second fracturing hole and the third fracturing hole, the sliding sleeve short section is in a closed state.
Preferably, the electrical sub comprises: the left end of the electric outer cylinder is connected with the upper joint, and an annular electric support is arranged in an annular space formed between the electric outer cylinder and the electric inner cylinder; the annular electric support is provided with an annular battery, a motor driver and a controller, wherein the motor driver and the controller are respectively electrically connected with the annular battery, and the motor driver is electrically connected with the controller.
Preferably, an annular battery bin for mounting the annular battery is arranged at the left end of the annular electric bracket; and a first mounting groove for mounting the motor driver and a second mounting groove for mounting the controller are formed in the right end of the annular electric support.
Preferably, an electrical joint is provided between the electrical sub and the hydraulic control sub, and a cable channel is provided in the electrical joint, in which a cable is placed to connect the motor driver in the electrical sub and the hydraulic control sub.
Preferably, the hydraulic control short section comprises a hydraulic control outer cylinder and a hydraulic control inner cylinder, and an annular oil storage cavity is formed between the hydraulic control outer cylinder and the hydraulic control inner cylinder; the left end of the hydraulic control outer cylinder is connected with the right end of the electric outer cylinder, and the left end of the hydraulic control inner cylinder and the right end of the electric inner cylinder are respectively connected with two ends of the electric joint; a motor and a hydraulic pump connected with the motor through a coupler are arranged in the annular oil storage cavity; the motor is electrically connected with the motor driver, and the hydraulic pump is connected with the reversing short section.
Preferably, a first liquid injection port communicated with the annular oil storage cavity is formed in the side wall, close to the electrical short section, of the hydraulic control outer cylinder, and a liquid outlet communicated with the annular oil storage cavity is formed in the side wall, close to the reversing short section, of the hydraulic control outer cylinder.
Preferably, the reversing short section comprises a valve seat, the left end of the valve seat is connected with the hydraulic control outer cylinder and the hydraulic control inner cylinder simultaneously, and the right end of the valve seat is connected with the sliding sleeve outer cylinder and the sliding sleeve inner cylinder simultaneously; the valve seat is provided with a first two-position three-way electromagnetic valve and a second two-position three-way electromagnetic valve, and a fluid channel matched with the first two-position three-way electromagnetic valve and the second two-position three-way electromagnetic valve is arranged inside the valve seat; through the first two-position three-way electromagnetic valve, the fluid channel is communicated with the left end of the sliding sleeve cavity rightwards and communicated with the hydraulic pump or the annular oil storage cavity leftwards; through the second two-position three-way electromagnetic valve, the fluid channel can be communicated with the right end of the sliding sleeve cavity rightwards and communicated with the hydraulic pump or the annular oil storage cavity leftwards.
Preferably, the end of the valve seat connected with the hydraulic control short section is provided with a first solenoid valve mounting groove for accommodating the first two-position three-way solenoid valve, a second solenoid valve mounting groove for accommodating the second two-position three-way solenoid valve, and a hydraulic pump mounting groove for accommodating the hydraulic pump along the axial direction.
Preferably, an annular mud stopping groove is formed in the outer surface, located on the right side of the first fracturing hole, of the sliding sleeve; a sealing assembly is arranged on the sliding sleeve; and the inner surface and the outer surface of the sliding sleeve are both provided with wear-resistant layers.
Preferably, the right end of the sliding sleeve cavity is provided with at least one guide shaft, the part of the sliding sleeve positioned on the right side of the first fracturing hole is provided with at least one guide hole matched with the guide shaft along the axial direction, and the guide shaft is inserted into the guide hole.
Preferably, a second liquid injection port communicated with the sliding sleeve cavity is arranged at the right end of the sliding sleeve outer cylinder.
Preferably, the well cementation sliding sleeve is full bore, the outer diameter of the well cementation sliding sleeve is 180 mm-190 mm, the inner diameter of the well cementation sliding sleeve is 100 mm-114 mm, and the length of the well cementation sliding sleeve is 2 m-2.5 m.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the well cementation sliding sleeve is connected with a sleeve and is put into a horizontal well together, the electric short section is controlled through radio, so that the hydraulic control short section and the reversing short section are controlled to drive the sliding sleeve to move left and right in the sliding sleeve cavity, and when the sliding sleeve moves to the position where the first fracturing hole is communicated with the second fracturing hole and the third fracturing hole, the well cementation sliding sleeve starts fracturing work; and when the sliding sleeve moves to the position where the first fracturing hole is not communicated with the second fracturing hole and the third fracturing hole, the fracturing operation is finished. And a plurality of well cementation sliding sleeves can be connected on the same casing pipe, so that multi-section fracturing operation on the horizontal well section of the shale gas well is realized. The well cementation sliding sleeve provided by the invention has the advantages of accurate operation and fast aging, simplifies the fracturing operation, can be repeatedly opened, and realizes the efficient development of unconventional oil and gas reservoirs such as shale gas.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a shale gas well cementing sliding sleeve provided by an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a reversing short section provided in an embodiment of the present invention;
FIG. 3 is a schematic diagram of an internal structure of a valve seat according to an embodiment of the present invention;
fig. 4 is a schematic view of a sliding sleeve structure provided in the embodiment of the present invention.
In the drawings, the respective reference numerals are:
i, an electrical short section; II, hydraulically controlling the short section; III, reversing short sections; IV, sliding sleeve short section;
1. an upper joint; 2. an upper end cover; 3. an electric outer barrel; 4. an electric inner barrel; 5. a motor driver; 6. an electrical connector; 7. a hydraulic control outer cylinder; 8. a first liquid injection port; 9. a hydraulic control inner cylinder; 10. a motor; 11. a coupling; 12. a hydraulic pump; 13. a first fluid channel; 14. a valve seat; 15. a second fluid passage; 16. an outer sleeve of the sliding sleeve; 17. a first fracturing bore; 18. a second fracturing hole; 19. a third fracturing hole; 20. a second liquid injection port; 21. a lower end cover; 22. a lower joint; 23. an inner sleeve of the sliding sleeve; 24. a sliding guide shaft; 25. a sliding sleeve; 26. a fifth fluid passage; 27. a third fluid passage; 28. a fourth fluid channel; 29. a safety valve; 30. a liquid outlet; 31. an oil storage chamber; 32. a cable channel; 33. a controller; 34. an electrical support; 35. a ring-shaped battery; 36. a first two-position three-way solenoid valve; 37. a second two-position three-way electromagnetic valve; 38. a first solenoid valve mounting groove; 39. a safety valve mounting groove; 40. a hydraulic pump mounting groove; 41. a second solenoid valve mounting groove; 42. an annular mud blocking groove; 43. a wear layer; 44. combining and sealing; 45. a sliding sleeve cavity.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, an embodiment of the present invention provides a well cementation sliding sleeve, which is a hollow tubular structure and includes an upper joint 1, an electrical short section i, a hydraulic control short section ii, a reversing short section iii, a sliding sleeve short section iv, and a lower joint 22, which are sequentially connected along an axial direction.
Wherein, sliding sleeve nipple IV includes: the sliding sleeve outer cylinder 16 and the sliding sleeve inner cylinder 23 form an annular sliding sleeve cavity 45 between the sliding sleeve outer cylinder 16 and the sliding sleeve inner cylinder 23;
a sliding sleeve 25 is arranged in the sliding sleeve cavity 45; a first fracturing hole 17 is formed in the side wall of the sliding sleeve 25, a second fracturing hole 18 is formed in the side wall of the sliding sleeve outer cylinder 16, and a third fracturing hole 19 opposite to the second fracturing hole 18 is formed in the side wall of the sliding sleeve inner cylinder 23;
the electric short section I is used for receiving signals and controlling the hydraulic control short section II and the reversing short section III to work; the hydraulic control short section II is matched with the reversing short section III and is used for driving the sliding sleeve 25 to move left and right in the sliding sleeve cavity 45; when the first fracturing hole 17 is opposite to and communicated with the second fracturing hole 18 and the third fracturing hole 19, the sliding sleeve pup joint IV is in an opening state; when the first fracturing hole 17, the second fracturing hole 18 and the third fracturing hole 19 are staggered, the sliding sleeve pup joint IV is in a closed state.
In order to clearly and concisely describe the technical scheme provided in the embodiment of the invention, the left end and the right end of the well cementation sliding sleeve are defined as follows:
(1) The left end of the well cementation sliding sleeve is one end close to the upper joint 1, and moves leftwards, namely moves towards the direction close to the upper joint 1.
(2) The right end of the well cementation sliding sleeve is one end close to the lower joint 22, and moves towards the right, namely moves towards the direction close to the lower joint 22.
It is understood by those skilled in the art that the above definition is only for convenience of describing the technical solution provided by the embodiment of the present invention, and is not to limit the actual structure of the well cementation sliding sleeve. Therefore, all components of the well cementation sliding sleeve provided by the embodiment of the invention can be sequentially connected from left to right and also can be sequentially connected from right to left.
The working principle of the well cementation sliding sleeve provided by the embodiment of the invention is as follows:
the well cementation sliding sleeve is connected with the casing through the upper joint 1 and the lower joint 22 and is put into a horizontal well along with the casing, and the sliding sleeve 25 is arranged at the left end of the sliding sleeve cavity 45. The opening signal is sent through the ground radio sending device, the electrical short section I receives and identifies the opening signal, so that the hydraulic control short section II and the reversing short section III are controlled to drive the sliding sleeve 25 to move rightwards in the sliding sleeve cavity 45, the first fracturing hole 17 is communicated with the second fracturing hole 18 and the third fracturing hole 19, and the sliding sleeve short section IV is opened. And then, a fracturing through hole for communicating the inner cavity of the well cementation sliding sleeve with the wall of the horizontal well is formed on the sliding sleeve pup joint IV. Therefore, the fracturing fluid introduced into the well cementation sliding sleeve can perform fracturing treatment on the area around the well section through the fracturing through hole. And after the fracturing treatment is finished, no fracturing fluid is introduced into the well cementation sliding sleeve, and a closing signal is sent by the ground radio sending device. The electrical nipple I receives and identifies a closing signal so as to control the hydraulic control nipple II and the reversing nipple III to drive the sliding sleeve 25 to move leftwards in the sliding sleeve cavity 45, so that the first fracturing hole 17, the second fracturing hole 18 and the third fracturing hole 19 are staggered, and the sliding sleeve nipple IV is closed.
When the well cementation sliding sleeve provided by the embodiment of the invention is used, a plurality of well cementation sliding sleeves can be connected on the same casing pipe at certain intervals and are put into a horizontal well together, and different well cementation sliding sleeves are opened through remote control to realize multi-section fracturing operation on a horizontal well section of a shale gas well.
The well cementation sliding sleeve provided by the embodiment of the invention adopts radio control operation, the control precision is high, the time efficiency is fast, and the sliding sleeve action is accurate; meanwhile, the well cementation sliding sleeve is simple and convenient to operate, can be opened repeatedly, simplifies fracturing operation, and realizes efficient development of unconventional oil and gas reservoirs such as shale gas.
Specifically, in order to further ensure the fracturing effect when fracturing is performed, a plurality of first fracturing holes 17 are uniformly arranged along the circumferential direction of the sliding sleeve 25, correspondingly, second fracturing holes 18 are uniformly arranged on the sliding sleeve outer cylinder 16 in the same number and are uniformly distributed along the circumferential direction of the sliding sleeve outer cylinder 16, and third fracturing holes 19 are arranged on the sliding sleeve inner cylinder 23 in the same number corresponding to the positions of the second fracturing holes 18. The well cementation sliding sleeve ensures the uniform fracturing of the surrounding bottom layer, reduces the possibility of the deformation of the casing pipe of the adjacent well section caused by uneven stress of the stratum, and improves the use safety of equipment. The number of the first, second, and third fracturing holes 17, 18, and 19 is not particularly limited, and may be, for example, 2, 3, 4, or the like.
In addition, the sliding sleeve pup joint iv can be directly connected with the lower joint 22, that is, the lower joint 22 is connected through the right ends of the sliding sleeve outer cylinder 16 and the sliding sleeve inner cylinder 23, and the left end of the lower joint 22 seals the sliding sleeve cavity 45 at this time. However, in order to improve the sealing performance of the sliding sleeve cavity 45 and the connection stability of the sliding sleeve short section iv and the lower joint 22, the well cementation sliding sleeve provided by the embodiment of the invention is further provided with a lower end cover 21 between the sliding sleeve short section iv and the lower joint 22. The left end of this lower end cover 21 is connected with sliding sleeve urceolus 16 and sliding sleeve inner tube 23, and the left end face shutoff of lower end cover 21 has strengthened the right-hand member portion in sliding sleeve chamber 45, has strengthened the leakproofness in sliding sleeve chamber 45, helps realizing that liquid accuse nipple II and the control about of III drive sliding sleeve 25 of switching-over nipple joint are in sliding sleeve chamber 45. The right end face of the lower end cover 21 is connected with the left end face of the lower joint 22, and separates the sliding sleeve outer cylinder 16 and the lower joint 22, so that the lower joint 22 is connected with the sliding sleeve inner cylinder 23 only. Therefore, when the well cementation sliding sleeve is connected to the casing, the operation of the lower joint 22 does not affect the main body part of the well cementation sliding sleeve, and the connection stability and the use safety of the well cementation sliding sleeve are enhanced. Furthermore, sealing assemblies are arranged at the joints of the lower end cover 21, the sliding sleeve short section IV and the lower joint 22, so that the connection stability among the components and the sealing effect of the sliding sleeve cavity 45 are improved. The connection mode of the lower end cover 21, the sliding sleeve pup joint IV and the lower joint 22 is not particularly limited, and threaded connection, welding, riveting and the like can be adopted.
Referring to fig. 1, an electrical short section i in a well cementation sliding sleeve provided by the embodiment of the present invention includes: the left end of the electric outer cylinder 3 and the electric inner cylinder 4 are connected with the upper joint 1 at the same time, and an annular electric bracket 34 is arranged in an annular space formed between the electric outer cylinder 3 and the electric inner cylinder 4; the annular electric bracket 34 is mounted with an annular battery 35, and a motor driver 5 and a controller 33 electrically connected to the annular battery 35, respectively, and the motor driver 5 is electrically connected to the controller 33.
The electrical short section I is a radio control short section in the well cementation sliding sleeve provided by the embodiment of the invention. The controller 33 is used for receiving and identifying signals sent by the ground wireless sending device, and controlling the motor driver 5 to be turned on or off according to the signals; the motor driver 5 is used for starting or stopping the operation of the pilot-controlled sub ii (specifically, controlling the operation of the pilot-controlled sub ii by controlling the opening and closing of the motor 10 in the pilot-controlled sub ii), and is used for providing power for the controller 33 and the motor driver 5, and the annular battery 35. Specifically, annular battery 35 is connected with controller 33 and motor drive 5 through the cable respectively, and controller 33 is connected with motor drive 5 through the cable simultaneously, and then realizes the control effect of whole electrical nipple I to this well cementation sliding sleeve.
More specifically, the ring-shaped battery 35, the controller 33, and the motor driver 5 are mounted on the ring-shaped electric bracket 34. So can effectively improve the space utilization in electric nipple joint I, also guarantee the installation stability of each part in electric nipple joint I simultaneously for electric nipple joint I's structure is more integrated, shortens the holistic length of well cementation sliding sleeve. Select for use annular battery 35 instead of dull and stereotyped battery simultaneously and also can improve the space utilization in electric nipple joint I to a certain extent, shorten the length of electric nipple joint I.
As for the structure of the annular electric bracket 34, specifically, an annular battery compartment for mounting the annular battery 35 is provided at the left end of the annular electric bracket 34; a first mounting groove for mounting the motor driver 5 and a second mounting groove for mounting the controller 33 are provided at the right end of the ring-shaped electric bracket 34. Further, cable channels are provided between the annular battery compartment and the first mounting groove, between the annular battery compartment and the second mounting groove, and between the first mounting groove and the second mounting groove, for placing cables for communicating the annular battery 35 with the motor driver 5 and the controller 33, and cables for communicating the controller 33 with the motor driver 5. So, can realize annular battery 35, motor driver 5 and controller 33 three's connection, the setting of cable groove also can avoid other components of cable winding simultaneously, the change and the clearance of the component in the electrical nipple I of being convenient for. The shape of the first mounting groove and the second mounting groove is not particularly limited, and may be, for example, two strip-shaped grooves disposed along the longitudinal direction of the annular electric bracket 34 or two annular grooves disposed along the circumferential direction of the annular electric bracket 34.
In addition, as for the connection mode of the electrical short piece I and the upper joint 1, the electrical short piece I can be simultaneously connected with the upper joint 1 through the electrical outer cylinder 3 and the electrical inner cylinder 4, and the right end of the upper joint 1 blocks an annular space formed by the electrical outer cylinder 3 and the electrical inner cylinder 4. However, in order to enhance the connection stability between the components in the well cementation sliding sleeve provided by the embodiment of the invention, an upper end cover 2 is also arranged between the upper joint 1 and the electrical short section I. Similar with the connection of lower cover 21 and sliding sleeve nipple IV and lower clutch 22, the right-hand member of this upper end cover 2 is connected with electric urceolus 3 and electric inner tube 4, and the right-hand member of this upper end cover 2 and the annular cavity looks adaptation of electric nipple I, has blockked the left end portion of annular cavity, improves this annular space's structural stability, has guaranteed the security of setting up the electric support 34 in this annular space. The left end face of the upper end cap 2 is in contact with the right end face of the upper joint 1, and separates the electric outer barrel 3 from the upper joint 1, so that the upper joint 1 is connected only to the electric inner barrel 4. Therefore, when the well cementation slide sleeve is connected to the casing, the operation of the upper joint 1 does not affect the main body part of the well cementation slide sleeve. Meanwhile, the connection mode between the upper end cover 2 and the electrical nipple I and the upper joint 1 is not specifically limited, and threaded connection, welding, riveting and the like can be adopted.
An electrical connector 6 is further arranged between the electrical nipple I and the hydraulic control nipple II, a cable channel 32 is arranged in the electrical connector 6, and a cable is placed in the cable channel 32 to connect the motor driver 5 in the electrical nipple I and the hydraulic control nipple II.
The electric joint 6 separates the electric nipple I and the hydraulic control nipple II, and the electric nipple I and the hydraulic control nipple II are connected through a cable penetrating through the cable channel 32. Specifically, the left end of the electrical connector 6 is connected to both the electrical outer barrel 3 and the electrical inner barrel 4, and the connection manner is not particularly limited. It can be seen that the left end of the electrical joint 6 plugs the right end of the annular cavity in the electrical nipple I, so that the annular electrical support 34 is installed in the closed annular cavity, the axial movement of the annular electrical support 34 is limited, the structure of the electrical nipple I is more stable, components in the electrical nipple I are not easily damaged, and the service life of the well cementation sliding sleeve is prolonged; the right end of the electrical joint 6 is connected with the hydraulic control short section II, so that the hydraulic control short section II can normally work, and the structure and the composition of the hydraulic control short section II in the well cementation sliding sleeve are elaborated in detail.
Referring to fig. 1, a hydraulic control nipple ii in the well cementation sliding sleeve provided by the embodiment of the present invention includes: an annular oil storage cavity 31 is formed between the hydraulic control outer cylinder 7 and the hydraulic control inner cylinder 9; the left end of the hydraulic control outer cylinder 7 is connected with the right end of the electric outer cylinder 3, and the left end of the hydraulic control inner cylinder 9 and the right end of the electric inner cylinder 4 are respectively connected with two ends of the electric joint 6; the annular oil storage cavity 31 is internally provided with a motor 10 and a hydraulic pump 12 connected with the motor 10 through a coupling 11; the motor 10 is electrically connected with the motor driver 5, and the hydraulic pump 12 is connected with the reversing short section III.
The well cementation sliding sleeve provided by the embodiment of the invention preferably selects a hydraulic control system to drive the sliding sleeve 25, and the hydraulic control short section II is a driving short section of the well cementation sliding sleeve. Specifically, motor 10 in this liquid accuse nipple joint II drives hydraulic pump 12 under the control of electric nipple joint I, and this hydraulic pump 12 is connected with switching-over nipple joint III, can pour into the hydraulic oil in the annular oil storage chamber 31 among the switching-over nipple joint III, thereby hydraulic oil gets into sliding sleeve nipple joint IV through switching-over nipple joint III and drives sliding sleeve 25 and remove.
More specifically, an annular cavity is formed between the hydraulic control outer cylinder 7 and the hydraulic control inner cylinder 9, the left ends of the hydraulic control outer cylinder 7 and the hydraulic control inner cylinder 9 are connected with the electrical connector 6, and the right ends of the hydraulic control outer cylinder 7 and the hydraulic control inner cylinder 9 are connected with the reversing nipple iii. It can be seen that an annular cavity in the hydraulic control nipple II forms a closed annular oil storage cavity 31 under the left and right plugging of the electrical connector 6 and the reversing nipple III, and the annular oil storage cavity 31 is used for storing hydraulic oil of the hydraulic control system. To sum up, separate electric nipple joint I and liquid accuse nipple joint II through electric joint 6, not only can improve the stability of electric nipple joint I and can also seal the left end in annular oil storage chamber 31 to in order to further improve the leakproofness in annular oil storage chamber 31, still can set up sealed assembly at the junction of electric joint 6 and liquid accuse nipple joint II, prevent that hydraulic oil from revealing.
Further, motor 10 and hydraulic pump 12 set up in annular oil storage chamber 31, have not only saved and have set up the connection structure between oil storage chamber and the hydraulic pump alone, simplify well cementation sliding sleeve structure and make overall structure more integrated, and the hydraulic oil in the annular oil storage chamber 31 can also cool off motor 10 and hydraulic pump 12 simultaneously, improves motor 10 and hydraulic pump 12's life. Specifically, to achieve this effect, the motor 10 is a micro motor, and the hydraulic pump 12 is a micro hydraulic pump 12.
In addition, a first liquid injection port 8 communicated with the annular oil storage cavity 31 is formed in the side wall, close to the electrical nipple I, of the hydraulic control outer cylinder 7, and a liquid outlet 30 communicated with the annular oil storage cavity 31 is formed in the side wall, close to the reversing nipple III, of the hydraulic control outer cylinder 7. The first liquid injection port 8 is used for injecting hydraulic oil into the annular liquid storage cavity 31; the liquid outlet 30 is used for discharging hydraulic oil when performing operations such as equipment cleaning. Set up first notes liquid mouth 8 and liquid outlet 30 and be favorable to discharging the air in the oil storage chamber at the hydraulic oil injection in-process equally on annular oil storage chamber 31 simultaneously, avoid causing the harm to motor 10 and hydraulic pump 12, improve the safety in utilization of this well cementation sliding sleeve.
Referring to fig. 2 and 3, the reversing short section iii in the well cementation sliding sleeve provided by the embodiment of the present invention includes a valve seat 14, the left end of the valve seat 14 is connected to the hydraulic control outer cylinder 7 and the hydraulic control inner cylinder 9, and the right end is connected to the sliding sleeve outer cylinder 16 and the sliding sleeve inner cylinder 23; a first two-position three-way electromagnetic valve 36 and a second two-position three-way electromagnetic valve 37 are mounted on the valve seat 14, and a fluid channel matched with the first two-position three-way electromagnetic valve 36 and the second two-position three-way electromagnetic valve 37 is arranged inside the valve seat 14; through the first two-position three-way electromagnetic valve 36, the fluid channel is communicated with the left end of the sliding sleeve cavity 45 rightwards and communicated with the hydraulic pump 12 or the annular oil storage cavity 31 leftwards; through the second two-position three-way solenoid valve 37, the fluid passage can communicate with the right end of the sliding sleeve chamber 45 to the right and communicate with the hydraulic pump 12 or the annular oil storage chamber 31 to the left.
It can be seen that the reversing pup joint III plays a role in connection and regulation. Specifically, this switching-over nipple joint III is used for connecting hydraulic control nipple joint II and sliding sleeve nipple joint IV, and this switching-over nipple joint III mutually supports with hydraulic control nipple joint II simultaneously for thereby the sliding sleeve 25 moves left or right in the hydraulic oil flow direction drive sliding sleeve nipple joint IV among the regulation and control hydraulic system.
Regarding the connection function of the reversing nipple iii, specifically, the left end of the valve seat 14 is connected with the hydraulic control outer cylinder 7 and the hydraulic control inner cylinder 9 at the same time, that is, the left end of the valve seat 14 is connected with the hydraulic control nipple ii, and the right end of the annular oil storage cavity 31 is blocked, so that the sealing performance of the annular oil storage cavity 31 is further ensured. The right end of the valve seat 14 is connected with the sliding sleeve outer cylinder 16 and the sliding sleeve inner cylinder 23 at the same time, namely the right end of the valve seat 14 is connected with the sliding sleeve short section IV and is matched with the lower end cover 21 to enable the sliding sleeve cavity 45 to form a sealed cavity, and normal operation of a hydraulic system is guaranteed. Wherein do not do specifically and restrict about the connected mode of disk seat 14 and hydraulic control nipple II and sliding sleeve nipple IV, can adopt modes such as riveting, threaded connection, can also set up sealed assembly in order to increase connection reliability and leakproofness at this disk seat 14 and hydraulic control nipple II and sliding sleeve nipple IV's junction simultaneously.
With regard to the regulating action of the reversing sub iii, in particular, there is also a fluid flow direction switch in the valve seat 14 and a fluid channel associated therewith. More specifically, in the present embodiment, the fluid flow direction converter includes a first two-position, three-way solenoid valve 36 and a second two-position, three-way solenoid valve 37.
The two-position three-way electromagnetic valve is provided with three through openings, and the connection relation of the three through openings in the two-position three-way electromagnetic valve can be changed by connecting or cutting off the power supply of the electromagnetic valve, so that the reversing function is realized. Further, in the embodiment of the invention, two different fluid channels can be realized in the two-position three-way solenoid valve by changing the connection relation of the three ports. In the reversing nipple iii, the first two-position three-way solenoid valve 36 and the second two-position three-way solenoid valve 37 are both connected with the controller 33, and the controller 33 is simultaneously communicated with the annular battery 35, so that the first two-position three-way solenoid valve 36 and the second two-position three-way solenoid valve 37 can be powered on or powered off through the controller 33, and further, the fluid channel connected with the first two-position three-way solenoid valve 36 and the second two-position three-way solenoid valve 37 is changed.
More specifically, referring to fig. 2 and 3, the fluid passage in the valve seat 14 includes: the left end of the first fluid channel 13 is communicated with the hydraulic pump 12 and used for feeding liquid, and the right end of the first fluid channel 13 can be communicated with a first two-position three-way electromagnetic valve 36 or a second two-position three-way electromagnetic valve 37; a fourth fluid channel 28 for discharging liquid, the left end of which is communicated with the annular oil storage cavity 31, and the right end of the fourth fluid channel 28 can be communicated with a first two-position three-way electromagnetic valve 36 or a second two-position three-way electromagnetic valve 37; the right end of the second fluid channel 15 is communicated with the left end of the sliding sleeve cavity 45, and the left end of the second fluid channel 15 is communicated with the first two-position three-way electromagnetic valve 36; and a third fluid channel 27 with the right end communicated with the fifth fluid channel 26 in the slip nipple iv, and the left end of the third fluid channel 27 is communicated with a second two-position three-way electromagnetic valve 37.
In order to facilitate the description of the working principle of the reversing nipple iii, it should be noted that hydraulic oil is also injected into the sliding sleeve cavity 45, so as to facilitate the normal operation of the hydraulic control system in the well cementation sliding sleeve. And as mentioned above, a fifth fluid channel 26 is further provided in the sliding sleeve cavity 45 and communicates with the right end of the sliding sleeve cavity 45, so as to further change the moving direction of the sliding sleeve 25 through a hydraulic control system. The working principle of the reversing nipple III is as follows:
when the pup joint iv is opened, on one hand, the controller 33 enables the first two-position three-way solenoid valve 36 to be in an energized state, and at this time, the first two-position three-way solenoid valve 36 communicates the first fluid passage 13 and the second fluid passage 15. Therefore, the hydraulic oil in the annular oil reservoir chamber 31 enters the left end of the sleeve chamber 45 through the first fluid passage 13 and the second fluid passage 15, and pushes the sliding sleeve 25 to move rightward. The second two-position three-way solenoid valve 37, on the other hand, is placed in a de-energized state by the controller 33, where the second two-position three-way solenoid valve 37 communicates the third fluid passage 27 and the fourth fluid passage 28. The hydraulic oil at the right end of the sleeve chamber 45 is drained out of the sleeve chamber 45 when the sleeve 25 moves to the right, and specifically, the hydraulic oil flows back to the annular oil reservoir chamber 31 through the fifth fluid passage 26, the third fluid passage 27 and the fourth fluid passage 28.
When the slip nipple iv is closed, on the one hand, the controller 33 causes the second two-position three-way solenoid valve 37 to be in an energized state, and at this time, the second two-position three-way solenoid valve 37 communicates with the first fluid passage 13 and the third fluid passage 27. Therefore, the hydraulic oil in the annular oil storage chamber 31 enters the right end of the sliding sleeve chamber 45 through the first fluid passage 13, the third fluid passage 27 and the fifth fluid passage 26, and pushes the sliding sleeve 25 to move leftward. On the other hand, the first two-position three-way solenoid valve 36 is in a de-energized state by the controller 33, and the first two-position three-way solenoid valve 36 communicates the second fluid passage 15 and the fourth fluid passage 28. The hydraulic oil at the left end of the sleeve chamber 45 is discharged out of the sleeve chamber 45 when the sleeve 25 moves leftward, and specifically, the hydraulic oil flows back to the annular oil reservoir chamber 31 through the second fluid passage 15 and the fourth fluid passage 28.
Meanwhile, in order to further ensure the safety of the hydraulic control system, the fourth fluid passage 28 for discharging the liquid is also connected with a safety valve 29, and when the flow in the fourth fluid passage 28 is too large, the safety valve 29 can cut off the fluid passage in time to ensure the safety of the annular oil storage chamber 31.
Further, regarding the structure of the valve seat 14, the end of the valve seat 14 connected to the pilot-controlled sub ii is provided with a first solenoid valve mounting groove 38 for accommodating the first two-position three-way solenoid valve 36, a second solenoid valve mounting groove 41 for accommodating the second two-position three-way solenoid valve 37, and a hydraulic pump mounting groove 40 for accommodating the hydraulic pump 12, respectively, along the axial direction. And accordingly, a relief valve installation groove 39 for accommodating the relief valve 29 may also be provided on the valve seat 14. So can effectively strengthen the steadiness of hydraulically controlled nipple joint II and switching-over nipple joint III.
Meanwhile, referring to fig. 4, in order to further improve the use safety of the well cementation sliding sleeve and the reliability of the fracturing operation, the sliding sleeve pup joint iv is defined as follows:
an annular mud-stopping groove 42 is formed in the outer surface, located on the right side of the first fracturing hole 17, of the sliding sleeve 25; a sealing assembly 44 is arranged on the sliding sleeve 25; and wear resistant layers 43 are provided on both the inner and outer surfaces of the sliding sleeve 25. The annular mud baffle groove 42 can effectively filter impurities with larger grain sizes, and the influence on the normal work of a fracturing hole is avoided; the sealing assembly 44 can enable the sliding sleeve 25 to be tightly combined with the sliding sleeve cavity 45 and increase the sealing performance of the sliding sleeve cavity 45, and more specifically, the sealing assembly 44 can be arranged on both sides of the first fracturing hole and the right end part of the sliding sleeve 25; the wear-resisting layer that sets up on sliding sleeve 25 internal and external surface can reduce sliding sleeve 25's wearing and tearing, when guaranteeing to open sliding sleeve nipple joint IV repeatedly, sliding sleeve 25 is at the leakproofness of operation in-process. The material of the wear-resistant layer is not particularly limited, and may be a metal coating or a wear-resistant silica gel.
Further, at least one guide shaft 24 is provided at the right end of the sliding sleeve cavity 45, and the portion of the sliding sleeve 25 located at the right side of the first fracturing hole 17 is provided with at least one guide hole adapted to the guide shaft 24 in the axial direction, and the guide shaft 24 is inserted into the guide hole. The guide shaft 24 enables the sliding sleeve 25 to move only along the axial direction of the sliding sleeve cavity 45 and cannot rotate in the sliding sleeve cavity 45, so that the stability of the sliding sleeve 25 during axial movement is ensured, and the first fracturing hole 1 can be aligned with the second fracturing hole 18 and the third fracturing hole 19 to perform sufficient fracturing operation. Further, a second liquid inlet 20 communicating with the sleeve chamber 45 is provided at the right end of the sleeve outer cylinder 16. Hydraulic oil is injected into the right end of the sliding sleeve cavity 45 through the second injection port 20, and then the sliding sleeve 25 is driven to move left and right through a hydraulic control system.
Regarding the integral structure of the well cementation sliding sleeve provided by the embodiment of the invention, specifically, the well cementation sliding sleeve is a full bore, the outer diameter of the well cementation sliding sleeve is 180 mm-190 mm, the inner diameter of the well cementation sliding sleeve is 100 mm-114 mm, and the length of the well cementation sliding sleeve is 2 m-2.5 m. More specifically, the outer diameter of the well cementation sliding sleeve is 190mm, the inner diameter is 114mm, and the length is 2.5m. Therefore, the well cementation sliding sleeve can be matched with a casing for a shale gas well to ensure the full drift diameter of the whole shaft, and a drilling jig is avoided in subsequent operation, so that the well cementation sliding sleeve can be quickly returned and put into production, and is convenient for field practical application. Meanwhile, the whole length of the sliding sleeve is short, so that the pipe string can be conveniently put in, and the underground operation is facilitated.
In summary, the well cementation sliding sleeve provided by the embodiment of the invention controls the opening and closing of the sliding sleeve through wireless signals, and can realize fracturing operation quickly and efficiently. This well cementation sliding sleeve has and does not receive sleeve pipe deformation, pit shaft integrality height, the full latus rectum of pit shaft, need not advantage such as later stage brill grinds, and sliding sleeve overall structure integrated level is high simultaneously, and body length is little, the borehole operation of being convenient for. Furthermore, the well cementation sliding sleeve simplifies the flow of fracturing operation of the shale gas well, reduces the operation time and saves the cost.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A well cementation sliding sleeve is characterized in that the well cementation sliding sleeve is of a hollow tubular structure and comprises an upper joint (1), an electrical short section, a hydraulic control short section, a reversing short section, a sliding sleeve short section and a lower joint (22) which are sequentially connected along the axial direction;
the sliding sleeve short section comprises: the sliding sleeve comprises a sliding sleeve outer cylinder (16) and a sliding sleeve inner cylinder (23), wherein an annular sliding sleeve cavity (45) is formed between the sliding sleeve outer cylinder (16) and the sliding sleeve inner cylinder (23);
a sliding sleeve (25) is arranged in the sliding sleeve cavity (45); a first fracturing hole (17) is formed in the side wall of the sliding sleeve (25), a second fracturing hole (18) is formed in the side wall of the sliding sleeve outer cylinder (16), and a third fracturing hole (19) opposite to the second fracturing hole (18) is formed in the side wall of the sliding sleeve inner cylinder (23);
the electric short section is used for receiving signals and controlling the hydraulic control short section and the reversing short section to work; the hydraulic control short section is matched with the reversing short section and used for driving the sliding sleeve (25) to move left and right in the sliding sleeve cavity (45); when the first fracturing hole (17) is opposite to and communicated with the second fracturing hole (18) and the third fracturing hole (19), the sliding sleeve short section is in an open state; when the first fracturing hole (17), the second fracturing hole (18) and the third fracturing hole (19) are staggered, the sliding sleeve short section is in a closed state;
the electrical sub comprises: the left end of the electric outer cylinder (3) and the left end of the electric inner cylinder (4) are connected with the upper connector (1) at the same time, and an annular electric support (34) is arranged in an annular space formed between the electric outer cylinder (3) and the electric inner cylinder (4); the annular electric bracket (34) is provided with an annular battery (35), a motor driver (5) and a controller (33) which are respectively electrically connected with the annular battery (35), and the motor driver (5) is electrically connected with the controller (33); an annular battery bin used for mounting the annular battery (35) is arranged at the left end of the annular electric bracket (34); a first mounting groove for mounting the motor driver (5) and a second mounting groove for mounting the controller (33) are formed in the right end of the annular electric support (34); cable channels are arranged between the annular battery bin and the first mounting groove, between the annular battery bin and the second mounting groove and between the first mounting groove and the second mounting groove and are used for placing cables for communicating the annular battery (35) with the motor driver (5) and the controller (33) and cables for communicating the controller (33) with the motor driver (5);
an annular mud blocking groove (42) is formed in the outer surface, located on the right side of the first fracturing hole (17), of the sliding sleeve (25), and the annular mud blocking groove (42) is used for filtering impurities with larger grain sizes; sealing assemblies (44) are arranged on two sides of the first fracturing hole (17) and the right end part of the sliding sleeve (25), and the sealing assemblies (44) are used for enabling the sliding sleeve (25) to be tightly combined with the sliding sleeve cavity (45); the wear-resistant sliding sleeve is characterized in that wear-resistant layers (43) are arranged on the inner surface and the outer surface of the sliding sleeve (25), and the wear-resistant layers (43) are used for reducing wear of the sliding sleeve (25).
2. The cementing slip sleeve according to claim 1, wherein an electrical joint (6) is provided between the electrical sub and the hydraulic control sub, and a cable channel (32) is provided in the electrical joint (6), a cable being placed in the cable channel (32) to connect the motor driver (5) in the electrical sub and the hydraulic control sub.
3. The well cementation sliding sleeve according to claim 2, wherein the hydraulic control short section comprises a hydraulic control outer cylinder (7) and a hydraulic control inner cylinder (9), and an annular oil storage cavity (31) is formed between the hydraulic control outer cylinder (7) and the hydraulic control inner cylinder (9);
the left end of the hydraulic control outer cylinder (7) is connected with the right end of the electric outer cylinder (3), and the left end of the hydraulic control inner cylinder (9) and the right end of the electric inner cylinder (4) are respectively connected with two ends of the electric joint (6);
a motor (10) and a hydraulic pump (12) connected with the motor (10) through a coupling (11) are arranged in the annular oil storage cavity (31);
the motor (10) is electrically connected with the motor driver (5), and the hydraulic pump (12) is connected with the reversing short section.
4. The well cementation sliding sleeve according to claim 3, wherein a first liquid injection port (8) communicated with the annular oil storage cavity (31) is arranged on the side wall of the hydraulic control outer cylinder (7) close to the electrical short section, and a liquid outlet (30) communicated with the annular oil storage cavity (31) is arranged on the side wall of the hydraulic control outer cylinder (7) close to the reversing short section.
5. The well cementation sliding sleeve according to claim 4, wherein the reversing short section comprises a valve seat (14), the left end of the valve seat (14) is connected with the hydraulic control outer cylinder (7) and the hydraulic control inner cylinder (9) at the same time, and the right end of the valve seat (14) is connected with the sliding sleeve outer cylinder (16) and the sliding sleeve inner cylinder (23) at the same time;
a first two-position three-way electromagnetic valve (36) and a second two-position three-way electromagnetic valve (37) are mounted on the valve seat (14), and a fluid channel matched with the first two-position three-way electromagnetic valve (36) and the second two-position three-way electromagnetic valve (37) is arranged inside the valve seat (14);
the fluid channel is communicated with the left end of the sliding sleeve cavity (45) rightwards and communicated with the hydraulic pump (12) or the annular oil storage cavity (31) leftwards through the first two-position three-way electromagnetic valve (36);
through the second two-position three-way electromagnetic valve (37), the fluid channel can be communicated with the right end of the sliding sleeve cavity (45) rightwards and communicated with the hydraulic pump (12) or the annular oil storage cavity (31) leftwards.
6. The well cementation sliding sleeve according to claim 5, wherein the end part of the valve seat (14) connected with the hydraulic control short section is provided with a first solenoid valve mounting groove (38) for accommodating the first two-position three-way solenoid valve (36), a second solenoid valve mounting groove (41) for accommodating the second two-position three-way solenoid valve (37) and a hydraulic pump mounting groove (40) for accommodating the hydraulic pump (12) along the axial direction.
7. The well cementation sliding sleeve according to claim 1, wherein the right end of the sliding sleeve cavity (45) is provided with at least one guide shaft (24), the part of the sliding sleeve (25) on the right side of the first fracturing hole (17) is provided with at least one guide hole matched with the guide shaft (24) along the axial direction, and the guide shaft (24) is inserted into the guide hole.
8. The well cementation sliding sleeve according to claim 7, wherein a second liquid injection port (20) communicated with the sliding sleeve cavity (45) is arranged at the right end of the sliding sleeve outer barrel (16).
9. The well cementation sliding sleeve according to any one of claims 1 to 8,
the well cementation sliding sleeve is full bore, the external diameter of the well cementation sliding sleeve is 180 mm-190 mm, the internal diameter of the well cementation sliding sleeve is 100 mm-114 mm, and the length of the well cementation sliding sleeve is 2 m-2.5 m.
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| CN107288602B (en) * | 2017-05-31 | 2019-11-12 | 中国石油天然气股份有限公司 | Automatically controlled toe end fracturing sliding sleeve |
| CN107288580B (en) * | 2017-08-07 | 2023-08-22 | 成都大学 | Remote control sleeve sliding sleeve based on potential difference communication |
| CN107246250B (en) * | 2017-08-07 | 2023-08-22 | 成都大学 | Intelligent sleeve toe end sliding sleeve based on liquid pulse signal control |
| CN109339756B (en) * | 2018-08-21 | 2020-12-01 | 中国石油天然气股份有限公司 | Construction method of pressure reduction type fracturing channel |
| CN110374551A (en) * | 2018-12-28 | 2019-10-25 | 成都众智诚成石油科技有限公司 | A kind of underground hydraulic-control starting sliding sleeve control system and control method |
| CN110685640B (en) * | 2019-11-12 | 2024-06-04 | 陈爱民 | Switching sliding sleeve device for oil gas exploitation, oil gas exploitation tool and switching method of wall body through hole of oil gas exploitation tool |
| CN110805410B (en) * | 2019-11-18 | 2020-07-14 | 中国石油天然气股份有限公司西南油气田分公司工程技术研究院 | Intelligent sliding sleeve of bridge-plug-free multistage fracturing electric control switch |
| CN112392433B (en) * | 2020-11-14 | 2022-08-30 | 中国石油天然气股份有限公司 | Continuous cable laying pipe switch sliding sleeve for oil extraction and use method |
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