CN112943201A - Infinite-stage mechanical switch fracturing sliding sleeve and shale oil three-dimensional development fracturing tool - Google Patents
Infinite-stage mechanical switch fracturing sliding sleeve and shale oil three-dimensional development fracturing tool Download PDFInfo
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- CN112943201A CN112943201A CN202110343051.4A CN202110343051A CN112943201A CN 112943201 A CN112943201 A CN 112943201A CN 202110343051 A CN202110343051 A CN 202110343051A CN 112943201 A CN112943201 A CN 112943201A
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- sliding sleeve
- fracturing
- mechanical switch
- sleeve
- hole
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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
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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
- E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention relates to the technical field of oil and gas field development and discloses an infinite mechanical switch fracturing sliding sleeve and a shale oil three-dimensional development fracturing tool. The shale oil three-dimensional development fracturing tool comprises an outer sliding sleeve, an inner sliding sleeve and a positioning clamp, wherein the outer sliding sleeve and the inner sliding sleeve are coaxially sleeved, and the positioning clamp is fixedly connected to the first end of the outer sliding sleeve and used for limiting a first limit distance for the inner sliding sleeve to move towards the first end of the outer sliding sleeve; be provided with first through-hole on the outer sliding sleeve, be provided with the second through-hole on the inner sliding sleeve, infinite mechanical switch fracturing sliding sleeve sets up to axial drive inner sliding sleeve, inner sliding sleeve circumferential direction makes infinite mechanical switch fracturing sliding sleeve can switch between the open mode of first through-hole and second through-hole intercommunication and the closed mode of first through-hole and second through-hole disconnection intercommunication under the combined action of outer sliding sleeve and locator card, first through-hole and second through-hole are at the first angle of closed mode circumference interval. The infinite mechanical switch fracturing sliding sleeve has the function of adjusting stress interference and pore pressure interference between wells and between fracturing sections.
Description
Technical Field
The invention relates to the technical field of oil and gas field development, in particular to an infinite mechanical switch fracturing sliding sleeve and a shale oil three-dimensional development fracturing tool.
Background
At present, in new processes such as a shale oil ultra-long horizontal well, a small well spacing, tight cutting, three-dimensional development and the like, the problems that stress interference and pore pressure interference between wells and between fracturing sections are difficult to predict and control in a production process exist, and in order to achieve the purpose of adjusting the stress interference and the pore pressure interference between the wells and the fracturing sections so as to achieve maximization of reservoir resource utilization amount, fracturing construction time and production time of each fracturing section of the horizontal well are controllable, new well completion processes and tools need to be developed, so that mutual interference between each horizontal well and each fracturing section is adjusted, balanced development of each well is guaranteed, and rapid failure in a short period of yield is avoided.
Disclosure of Invention
The invention aims to solve the problems that stress interference and pore pressure interference between wells and between fracturing sections are difficult to predict and control in the production process in the new processes of a shale oil ultra-long horizontal well, a small well spacing, dense cutting, three-dimensional development and the like in the prior art, and provides an infinite mechanical switch fracturing sliding sleeve and a shale oil three-dimensional development fracturing tool.
In order to achieve the purpose, the invention discloses an infinite mechanical switch fracturing sliding sleeve which is used for a shale oil three-dimensional development fracturing tool, wherein the shale oil three-dimensional development fracturing tool comprises an outer sliding sleeve, an inner sliding sleeve and a positioning clamp, wherein the outer sliding sleeve and the inner sliding sleeve are coaxially sleeved with each other, the positioning clamp is fixedly connected to the first end of the outer sliding sleeve, and the positioning clamp is used for limiting the first limit distance of the inner sliding sleeve moving towards the first end of the outer sliding sleeve; be provided with first through-hole on the outer sliding sleeve, be provided with the second through-hole on the inner sliding sleeve, infinitely variable mechanical switch fracturing sliding sleeve sets up to axial drive during the inner sliding sleeve, inner sliding sleeve is in outer sliding sleeve with circumferential direction makes when axial displacement under the combined action of locator card infinitely variable mechanical switch fracturing sliding sleeve can first through-hole with the open mode of second through-hole intercommunication with first through-hole with switch over between the closed mode of second through-hole disconnection intercommunication, wherein, first through-hole with the second through-hole is at the first angle of closed mode circumference interval.
Through setting up like this, can be in the relative outer sliding sleeve motion of sliding sleeve in the axial drive, through set up guide structure between outer sliding sleeve and the inner sliding sleeve for outer sliding sleeve and inner sliding sleeve circumferential direction first angle, thereby make first through-hole with the intercommunication of second through-hole intercommunication or the intercommunication of staggering realizes opening or closes. Therefore, when the infinite mechanical switch fracturing sliding sleeve and the underground switch tool for driving the infinite mechanical switch fracturing sliding sleeve to be opened or closed are used in a matched mode, the problem that stress interference and pore pressure interference between wells and fracturing sections in a production process become difficult to predict and control in new processes of shale oil ultra-long horizontal wells, small well spacing, tight cutting, three-dimensional development and the like in the prior art can be solved, and the infinite mechanical switch fracturing sliding sleeve has the function of adjusting the stress interference and the pore pressure interference between the wells and the fracturing sections.
Further, the positioning card is detachably connected with the outer sliding sleeve.
Furthermore, one end of the outer sliding sleeve facing the positioning card comprises a first conical sleeve with a conical inner surface, and an inner thread is arranged on the inner wall of the first conical sleeve; one end, facing the outer sliding sleeve, of the positioning clamp comprises a second conical sleeve with a conical outer surface, and an external thread is arranged on the outer wall of the second conical sleeve; the positioning clamp and the outer sliding sleeve are in threaded connection through the second conical sleeve and the first conical sleeve.
Furthermore, the outer sliding sleeve and the inner sliding sleeve are provided with a first contact surface and a second contact surface which are opposite to each other and can be contacted with each other under the action of external force and move relatively along the first track.
Furthermore, the infinite mechanical switch fracturing sliding sleeve is in contact with the first contact surface and the second contact surface under the action of axial force and relatively moves along the first track, and the outer sliding sleeve and the inner sliding sleeve relatively rotate by a second angle.
Furthermore, the inner sliding sleeve and the positioning card are provided with a third contact surface and a fourth contact surface which are opposite to each other and can contact with each other under the action of external force and move relatively along a second track.
Furthermore, the infinite mechanical switch fracturing sliding sleeve is in contact with the third contact surface and the fourth contact surface under the action of axial force and moves relatively along the second track, the outer sliding sleeve and the inner sliding sleeve rotate relatively by a third angle, and the sum of the second angle and the third angle is equal to the first angle.
Further, the inner sliding sleeve comprises a guide table arranged on the outer wall of the inner sliding sleeve, and the second contact surface and the third contact surface are formed on the guide table; a groove structure for accommodating the guide table is formed on the inner wall of the outer sliding sleeve, the groove structure comprises a first limiting groove and a second limiting groove which are circumferentially arranged at intervals to limit the axial position of the guide table in the groove structure in different working states, and the first contact surface is circumferentially connected with the first limiting groove and the second limiting groove; the locator card includes an axially extending guide tooth on which the fourth contact surface is formed.
Still further, the inner sliding sleeve and the positioning card are arranged at intervals along the axis, and the first contact surface deviates from the first end of the positioning card and deflects towards the second end of the positioning card in the first direction; the fourth contact surface deviates from the first end of the inner sliding sleeve and faces the second end of the inner sliding sleeve in the circumferential direction to the first direction.
Furthermore, the infinite mechanical switch fracturing sliding sleeve comprises a return spring which axially extends to drive the inner sliding sleeve to axially return, and two ends of the return spring are respectively connected with the inner sliding sleeve and the positioning clamp.
Finally, the invention provides a shale oil three-dimensional development fracturing tool which comprises the infinite mechanical switch fracturing sliding sleeve and an underground switch tool for driving the infinite mechanical switch fracturing sliding sleeve to be opened or closed.
Drawings
Fig. 1 is a schematic structural diagram of a sliding sleeve switch as a downhole switch tool in a shale oil three-dimensional development fracturing tool according to an embodiment of the present invention;
FIG. 2 is a schematic external view of FIG. 1;
FIG. 3 is a schematic view of the drive pawl of FIG. 1;
FIG. 4 is a schematic diagram of the piston rod of the drive configuration of FIG. 1;
FIG. 5 is a schematic view showing the entire structure of the rotating part of FIG. 1;
FIG. 6 is a schematic structural view of the hydraulic buckle tube body shown in FIG. 5;
FIG. 7 is a schematic structural view of the upper bearing sleeve of FIG. 1;
FIG. 8 is a schematic structural view of the lower bearing housing of FIG. 1;
FIG. 9 is a schematic view of the oil pipe coupling of FIG. 1;
FIG. 10 is a schematic diagram of a shale oil three-dimensional development fracturing tool in accordance with an embodiment;
FIG. 11 is a schematic overall structure diagram of an infinite mechanical switch fracturing sliding sleeve according to an embodiment of the invention;
FIG. 12 is an external view of FIG. 11;
FIG. 13 is a schematic structural view of the outer sliding sleeve of FIG. 11;
FIG. 14 is a schematic structural view of the inner sliding sleeve in FIG. 11;
FIG. 15 is a schematic view of the structure of the locator card of FIG. 11;
description of the reference numerals
A fixed part 1; a bearing inner sleeve 11; a fixing sleeve 111; a fixed sleeve 112; a guide structure 12; a rotating part 2; a body 21; a drive pawl 22; a slide way 221; a drive structure 23; t-shaped structure 231; a channel 24; a rotating sleeve 25; a sliding sleeve seal ring 26; a non-return structure 3; the first tooth structure 31; a second tooth structure 32; a support structure 4; an infinite mechanical switch fracturing sliding sleeve 5; an outer slide sleeve 51; a first through hole 511; a first contact surface 512; a trench structure 513; a first limit groove 5131; a second limit groove 5132; an anti-clogging material receiving groove 514; a third tapered sleeve 515; a first tapered sleeve 516; an inner sliding sleeve 52; a second through hole 521; a second contact surface 522; a third contact surface 523; a locator card 53; a fourth contact surface 531; a guide tooth 532; a second tapered sleeve 533; a guide table 524; a return spring 54; a spacer 55; a downhole switching tool 6; coiled tubing 0.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. In the present invention, it is to be understood that the terms "away", "toward", "upper", "lower", "front", "rear", "left", "right", and the like indicate an orientation or positional relationship corresponding to an orientation or positional relationship in actual use; "inner and outer" refer to the inner and outer relative to the profile of the components themselves; this is done solely for the purpose of facilitating the description of the invention and simplifying the description without indicating that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation and therefore should not be construed as limiting the invention.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The invention discloses a sliding sleeve switch for a shale oil three-dimensional development fracturing tool, which can be used as an underground switch tool of the shale oil three-dimensional development fracturing tool. As shown in fig. 1-9: the sliding sleeve switch comprises a fixing portion 1 and a rotating portion 2 capable of being opposite to the fixing portion 1, the fixing portion 1 and the rotating portion 2 are opposite to each other to limit a non-return structure 3 in the rotating direction of the rotating portion 2, the rotating portion 2 comprises a body 21 and a driving claw 22 capable of being opened radially on the body 21 and a driving structure 23 for driving the driving claw 22 to act, and the driving structure 23 is connected with the connecting position of the driving claw 22 in a sliding mode. Through the technical scheme, through setting up fixed part 1 and rotation portion 2, and set up contrary structure 3 that ends between fixed part 1 and rotation portion 2, make fixed part 1 only rotate along fixed direction relative rotation portion 2, make driving pawl 22 that can radially open through the setting make driving pawl 22 can radially open or draw in under the drive of drive structure 23, when opening, this sliding sleeve switch of axial displacement can realize using this sliding sleeve switch's sliding sleeve to switch between operating condition and non-operating condition, can pass in and out this sliding sleeve as required in the state of drawing in. The sliding sleeve switch can open and close the sliding sleeve which is connected in series at one time and has any number of stages and the inner diameter of which is the full-bore diameter, so that the fracturing sequence and production are flexibly adjusted, infinite-stage fracturing is realized, and the sliding sleeve has the advantages of simple structure, flexible operation and higher reliability; the construction efficiency can be effectively improved.
Preferably, the driving pawl 22 includes a hook-shaped protrusion 222, the body 21 is provided with a protrusion matching with the hook-shaped protrusion 222, the hook-shaped protrusion 222 is clamped on the protrusion, the rotating portion 2 includes a hydraulic snap head 26 mounted at an end of the rotating portion 2 away from the positioning clamp 53, and the hydraulic snap head 26 and the protrusion limit the driving pawl 22 to move axially together. The structure is simple and the work is reliable.
Preferably, the sliding-sleeve switch comprises a passage 24 connecting the driving structure 23 and the external environment, passing through the fixed part 1 and the rotating part 2. In this way, a driving force can be provided to the driving structure 23 from the external environment through the channel 24. When the driving structure 23 is electrically driven, current may be input from the outside through the channel 24 through an electric circuit, and when the driving structure 23 is fluid driven, pressure fluid may be input from the outside through the channel 24 to provide a driving force for the driving structure 23.
Preferably, the drive structure 23 is provided as a hydraulic cylinder which is connected to a pressure source in the external environment via the channel 24. The method is convenient and safe to operate, and the pressure is easy to control.
Preferably, the non-return structure 3 comprises a first tooth structure 31 and a second tooth structure 32 engaged with each other, wherein the first tooth structure 31 is fixedly connected with the rotating part 2, and the second tooth structure 32 is fixedly connected with the fixing part 1. Through setting up like this for rotating part 2 can only rotate to a direction relative fixed part 1, thereby can make reliable operation, and the fault-tolerant rate is high.
Preferably, the fixing part 1 comprises a hollow bearing inner sleeve 11 and a guide structure 12 surrounding the bearing inner sleeve 11; the second tooth structure 32 is fixedly connected to the guide structure 12. The guide structure 12 is used for guiding and righting the underground switch tool 6 in the infinite mechanical switch fracturing sliding sleeve 5, and prevents the infinite mechanical switch fracturing sliding sleeve 5 from being coaxial with the underground switch tool 6, so that the underground switch tool 6 is not eccentric when being axially driven and the inner sliding sleeve 52 is further driven to axially move, and the reliability of the operation of the shale oil three-dimensional development fracturing tool is improved.
Preferably, the sliding sleeve switch comprises a supporting structure 4 supported on the fixed part 1 and the rotating part 2, and the supporting structure 4 comprises an inner ring and an outer ring which are axially fixed and can rotate relatively in the circumferential direction; the inner ring is fixedly connected with the bearing inner sleeve 11, and the outer ring is fixedly connected with the rotating part 2.
Preferably, the bearing inner sleeve 11 comprises an axially disposed fixed sleeve 111 and a fixed sleeve 112, wherein the fixed sleeve 112 is a radial protrusion from the outer circumference of the fixed sleeve 111; one end of the rotating sleeve 25 close to the first tooth structure 31 is provided with a stop structure, and the rotating sleeve 25 forms a bearing accommodating cavity through the walls of the fixed sleeve 111, the fixed sleeve 112 and the rotating sleeve 25 and the stop structure; a bearing having an inner race and an outer race is fitted over the outer surface of the stationary sleeve 111 and is accommodated in the bearing accommodating chamber. By this arrangement, the fixed part 1 and the rotating part 2 can be relatively rotated.
Preferably, the rotating part 2 comprises a rotating sleeve 25 fixedly connected with the outer ring; the rotating sleeve 25 is detachably connected with the body 21.
Preferably, the fixing portion 1 includes disc springs disposed in the bearing accommodating cavity, the disc springs are sleeved on the outer circumference of the fixing sleeve 111 and located at the branches of the bearing and the stopping structure, and the number of the disc springs is determined according to the axial size of the first tooth structure 31 and the elastic deformation of the disc springs. So that the movement among the inner sliding sleeve 52, the outer sliding sleeve 51 and the positioning card 53 is normal, and the opening and closing of the infinite mechanical switch fracturing sliding sleeve 5 can be realized when the inner sliding sleeve 52 moves in an axial reciprocating manner. When the rotating part 2 rotates, the first tooth structure 31 is engaged with the second tooth structure 32, the rotating part 2 can axially vibrate relative to the fixing part 1 while rotating, and the disc spring provides a space for the axial vibration of the rotating part 2 and always ensures that the first tooth structure 31 and the second tooth structure 32 are in an engaged state.
Preferably, one end of the driving pawl 22 is hinged to the body 21, a slide way 221 is disposed on the driving pawl 22, one end of the driving structure 23 is mounted in the slide way 221, the other end of the driving structure 23 is mounted in the body 21, and the driving pawl 22 rotates along the hinge point while moving radially under the driving of the driving structure 23.
Preferably, a plurality of said driving pawls 22 are uniformly distributed along the circumference of said body 21.
Preferably, the sliding sleeve switch includes a screw thread formed at an end of the guide structure 12 facing away from the rotating part 2 to be screw-coupled with the coiled tubing 0. Like this, when need send into the sliding sleeve switch and lie in the unlimited level mechanical switch fracturing sliding sleeve 5 in the pit, send into unlimited level mechanical switch fracturing sliding sleeve 5 in the pit through with coiled tubing 0 behind sliding sleeve switch threaded connection.
The invention discloses a shale oil three-dimensional development fracturing tool, as shown in fig. 10-15, the shale oil three-dimensional development fracturing tool comprises an infinite mechanical switch fracturing sliding sleeve 5 and a downhole switch tool 6 for driving the infinite mechanical switch fracturing sliding sleeve 5 to be opened or closed, and the downhole switch tool can adopt the sliding sleeve switch. The shale oil three-dimensional development fracturing tool controls the opening and closing of the infinite mechanical switch fracturing sliding sleeve 5 through the underground switch tool 6, and the shale oil three-dimensional development fracturing tool has the advantages similar to the technical advantages of the sliding sleeve switch and is not repeated herein.
The infinite-stage mechanical switch fracturing sliding sleeve 5 comprises an outer sliding sleeve 51, an inner sliding sleeve 52 and a positioning clamp 53, wherein the outer sliding sleeve 51 and the inner sliding sleeve 52 are coaxially sleeved with each other, and the positioning clamp 53 is fixedly connected to the first end of the outer sliding sleeve 51 and used for limiting the first limit distance of the inner sliding sleeve 52 moving towards the first end of the outer sliding sleeve 51; the outer sliding sleeve 51 is provided with a first through hole 511, the inner sliding sleeve 52 is provided with a second through hole 521, and when the infinite mechanical switch fracturing sliding sleeve 5 is axially driven by the inner sliding sleeve 52, the inner sliding sleeve 52 axially moves under the combined action of the outer sliding sleeve 51 and the positioning clamp 53 and circumferentially rotates to enable the infinite mechanical switch fracturing sliding sleeve 5 to be switched between an open state in which the first through hole 511 is communicated with the second through hole 521 and a closed state in which the first through hole 511 is disconnected from the second through hole 521, wherein the first through hole 511 and the second through hole 521 are circumferentially spaced by a first angle in the closed state. Through the arrangement, the inner sliding sleeve 52 can be driven to move relative to the outer sliding sleeve 51 in the axial direction, and meanwhile, the guide structure is arranged between the outer sliding sleeve 51 and the inner sliding sleeve 52, so that the outer sliding sleeve 51 and the inner sliding sleeve 52 rotate circumferentially by a first angle, the first through hole 511 is communicated with the second through hole 521 or communicated in a staggered mode, and opening or closing is achieved.
Wherein, the positioning card 53 and the outer sliding sleeve 51 are detachably connected, so that the processing, the manufacturing and the installation are convenient.
Preferably, one end of the outer sliding sleeve 51 facing the positioning card 53 and a first tapered sleeve 516 with a tapered inner surface, wherein the inner wall of the first tapered sleeve 516 is provided with an internal thread; the end of the positioning clamp 53 facing the outer sliding sleeve 51 comprises a second tapered sleeve 533 with a tapered outer surface, and the outer wall of the second tapered sleeve 533 has an external thread; the positioning clamp 53 and the outer sliding sleeve 51 are connected by the second taper sleeve 533 and the first taper sleeve 516. Like this, can make locator card 53 and outer sliding sleeve 51 connect into the inner wall at same face of cylinder, the sleeve structure of outer wall at same face of cylinder is favorable to the three-dimensional development fracturing tool of shale oil to carry to the pit also to be favorable to switching tool 6 business turn over infinite level mechanical switch fracturing sliding sleeve 5 in the pit.
The outer wall of the outer sliding sleeve 51 includes an anti-blocking material receiving groove 514, and the first through hole 511 is formed in the anti-blocking material receiving groove 514. In this way, the anti-blocking material accommodating groove 514 can be filled with a solid material that is easily soluble in the fracturing fluid, and the first through hole 511 can be effectively prevented from being blocked.
Preferably, the outer sliding sleeve 51 and the inner sliding sleeve 52 have a first contact surface 512 and a second contact surface 522 which are opposite to each other and can contact each other under an external force and move relatively along a first track. Through the contact of the first contact surface 512 and the second contact surface 522, when the inner sliding sleeve 52 axially moves in the outer sliding sleeve 51, the first contact surface 512 provides a guiding function for the second contact surface 522, so that the inner sliding sleeve 52 moves according to a set first track, thereby achieving the set purpose.
Preferably, the infinite stage mechanical switch fracturing sliding sleeve 5 contacts the first contact surface 512 and the second contact surface 522 under the action of an axial force and moves relatively along the first track, and the outer sliding sleeve 51 and the inner sliding sleeve 52 rotate relatively by a second angle. By means of the arrangement, the inner sliding sleeve 52 and the outer sliding sleeve 51 are pushed axially to move relatively, and meanwhile, the inner sliding sleeve and the outer sliding sleeve rotate relatively. Therefore, the device is simple to operate, reliable in action and particularly suitable for underground environment. Preferably, the inner sliding sleeve 52 and the positioning clip 53 have a third contact surface 523 and a fourth contact surface 531 opposite to each other and capable of contacting each other under an external force and moving relatively along the second track. Through the contact between the third contact surface 523 and the fourth contact surface 531, when the inner sliding sleeve 52 moves axially and contacts the positioning card 53, the second contact surface 522 provides a guiding function for the third contact surface 523, so that the inner sliding sleeve 52 moves according to a set second track, thereby achieving the set purpose.
Preferably, the infinite mechanical switch fracturing sliding sleeve 5 contacts the third contact surface 523 and the fourth contact surface 531 under the action of an axial force and moves relatively along the second track, the outer sliding sleeve 51 and the inner sliding sleeve 52 rotate relatively by a third angle, and the sum of the second angle and the third angle is equal to the first angle. Through the arrangement, the inner sliding sleeve 52 and the outer sliding sleeve 51 are pushed axially to move relatively and rotate relatively again, and the two sides rotate by a first angle, so that the first through hole 511 and the second through hole 521 are communicated or disconnected.
Preferably, the inner sliding sleeve 52 includes a guide table 524 disposed on an outer wall of the inner sliding sleeve 52, and the second contact surface 522 and the third contact surface 523 are formed on the guide table 524; a groove structure 513 for accommodating the guide table 524 is formed on the inner wall of the outer sliding sleeve 51, the groove structure 513 comprises a first limit groove 5131 and a second limit groove 5132 which are circumferentially arranged at intervals to limit the axial position of the guide table 524 in the groove structure 513 under different working states, and the first contact surface 512 is circumferentially connected with the first limit groove 5131 and the second limit groove 5132; the locator card 53 includes axially extending guide teeth 532, and the fourth contact surface 531 is formed on the guide teeth 532. Through the arrangement, when the inner sliding sleeve 52 is pushed to move in the outer sliding sleeve 51 in the axial direction, the inner sliding sleeve 52 of the outer sliding sleeve 51 rotates by a set angle under the combined action of the outer sliding sleeve 51 and the positioning clamp 53, and the communication or disconnection of the first through hole 511 and the second through hole 521 is realized.
Preferably, the inner sliding sleeve 52 and the positioning clip 53 are arranged at intervals along the axis, and the first contact surface 512 is deflected in a first direction circumferentially away from a first end of the positioning clip 53 and toward a second end of the positioning clip 53; the fourth contact surface 531 is offset circumferentially in the first direction from the first end of the inner sliding sleeve 52 toward the second end of the inner sliding sleeve 52. Through setting up like this, when ensureing that the axial promotes inner sliding sleeve 52, inner sliding sleeve 52 corotation under outer sliding sleeve 51 and locator card 53's effect, like this, not only simple structure but also easy emergence is in disorder.
Preferably, the infinite mechanical switch fracturing sliding sleeve 5 comprises a return spring 54 extending axially to drive the inner sliding sleeve 52 to axially return, and two ends of the return spring 54 are respectively connected with the inner sliding sleeve 52 and the positioning clamp 53. By arranging the return spring 54, the inner sliding sleeve 52 can be reset without applying other power, and the structure is simple, the manufacturing is convenient and the operation is reliable.
Preferably, a first shoulder is protruded from the outer wall of the lower part of the inner sliding sleeve 52, and a second shoulder is protruded from the lower part of the inner wall of the outer sliding sleeve 51. Such that the first and second shoulders abut one another to form a displacement limit for the inner sliding sleeve 52 to slide axially downward.
Preferably, the height of the second through hole 521 is H, and the sealing height of the multi-channel isolation ring 55 is about 2-3H; the axial sliding stroke of the inner sliding sleeve 52 is not less than the sealing height of the implementation isolation ring 55; to prevent clogging of the passage communicating the second through hole 521 and the first through hole 511.
Preferably, the end of the return spring 54 facing the inner sliding sleeve 52 meets the inner sliding sleeve 52, and the end of the return spring 54 facing away from the inner sliding sleeve 52 abuts against a third shoulder protruding from the upper part of the inner wall of the positioning clip 53 to form a limit for the return spring 54, so that the return spring 54 is compressed when being pressed, and after the pressure is removed, the return spring 54 provides a return force to the inner sliding sleeve 52 by using the third shoulder as a supporting shaft, and drives the inner sliding sleeve 52 to move axially away from the third shoulder.
Preferably, a plurality of isolation rings 55 are respectively arranged on the upper side and the lower side of the first through hole 511 on the outer wall of the inner sliding sleeve 52, and are used for forming a sealed cavity between the inner sliding sleeve 52 and the outer sliding sleeve 51, and the sealed cavity, the second through hole 521 and the first through hole 511 form a passage communicated with the external environment in the construction process.
Preferably, the end of the outer sliding sleeve 51 facing away from the locator card 53 comprises a third tapered sleeve 515. Connecting the casing string through the third tapered sleeve 515 can send the infinite mechanical switch fracturing sleeve 5 downhole,
for further explanation of the present invention, the following is a brief explanation of the use of the shale oil three-dimensional development fracturing tool, and for convenience of description, the positional relationship of the shale oil three-dimensional development fracturing tool during use is described.
Example one of the shale oil three-dimensional development fracturing tool uses:
when the fracturing fluid is used for a fracturing process, the use steps are as follows:
the method comprises the following steps: the infinite-stage mechanical switch fracturing sliding sleeve 5 is connected with a casing string or an oil pipe string in series and then is put into a well;
step two: the underground switch tool 6 is lowered into the position of the infinite mechanical switch fracturing sliding sleeve 5 by using the coiled tubing 0;
step three: the driving structure 23 adopts a hydraulic cylinder, pressure fluid is added into the coiled tubing 0, and a piston rod of the hydraulic cylinder extends outwards in the radial direction under the action of the hydraulic pressure; the T-shaped structure 231 slides along the T-shaped slide way 221 on the driving pawl 22 and moves simultaneously with the driving pawl 22 in the radial direction, so as to spread the driving pawl 22, and the driving pawl 22 rotates until the cantilever end of the driving pawl 22 abuts against the inner wall of the outer sliding sleeve 51;
step four: keeping the opening state of the driving claw 22 unchanged, and lifting the downhole switch tool 6; the inner sliding sleeve 52 slides upwards along the axial direction under the axial thrust of the driving claw 22, the guide table 524 on the top of the outer wall of the inner sliding sleeve 52 rotates while sliding axially under the action of the groove structure 513 on the inner wall of the outer sliding sleeve 51 and the positioning clamp 53 coaxially arranged with the outer sliding sleeve 51, and at the moment, the rotating part 2 of the downhole switching tool 6 rotates synchronously with the inner sliding sleeve 52;
step five: when the underground switch tool 6 is lifted and meets a resistance, the pulling force of lifting the coiled tubing 0 from the wellhead is released, and the inner sliding sleeve 52 slides downwards along the axial direction under the action of the return spring 54; in the downward sliding process of the inner sliding sleeve 52, the guide table 524 continues to rotate in the same direction and slide downward under the action of the groove structure 513, after positioning, the first through hole 511 and the second through hole 521 are communicated with each other, and a sealed annular space is formed between the inner sliding sleeve 51 and the outer sliding sleeve 51 under the action of the isolation ring 55, so that a blasthole formed on the wall of a borehole is communicated with the first through hole 511 and the second through hole 521, and fracturing fluid can enter the blasthole through a hollow inner cavity of the inner sliding sleeve 52 to perform fracturing work;
step six: after the infinite mechanical switch fracturing sliding sleeve 5 is opened, pressure in the coiled tubing 0 is relieved, a piston rod of the hydraulic cylinder retracts to drive the driving claw 22 to return to the original position, the coiled tubing 0 is lifted up, and the underground switch tool 6 is taken out;
step seven: performing fracturing construction operation;
step eight: and after the construction operation is finished, closing the sliding sleeve according to the same steps, and taking out the underground switch tool 6.
Example two of the use of the shale oil three-dimensional development fracturing tool:
the example was used to adjust the production process using the steps:
the method comprises the following steps: after the first infinite-stage mechanical switch fracturing sliding sleeve 5 is opened or closed in the second to fifth steps mentioned in the first embodiment, the hydraulic pressure in the continuous oil pipe 0 is discharged, so that the driving claw 22 is folded;
step two: moving the downhole switch tool 6 to the position of the second infinite mechanical switch fracturing sliding sleeve 5, and opening or closing the second infinite mechanical switch fracturing sliding sleeve 5 by the steps two to five mentioned in the first embodiment;
step three: analogize in proper order, open or close a N infinite level mechanical switch fracturing sliding sleeve 5 in proper order, like this, transfer one time downhole switch instrument 6 according to the construction requirement and can realize opening and close of a plurality of infinite level mechanical switch fracturing sliding sleeves 5 to the production state of quick regulation horizontal well.
In the above embodiment, when the infinite mechanical switch fracturing sliding sleeve 5 is opened by the downhole switch tool 6, the downhole switch tool 6 enters the bottom of the infinite mechanical switch fracturing sliding sleeve 5 through the inner cavity controlled in the inner sliding sleeve 52 in the infinite mechanical switch fracturing sliding sleeve 5, and then pressure fluid is injected into the radially arranged driving structure 23 which is a hydraulic cylinder through the channel 24, so that the piston rod of the hydraulic cylinder radially extends out, the outer end of the piston rod is provided with the T-shaped structure 231, and the T-shaped structure 231 is accommodated in the slideway 221 on the driving claw 22, and pushes the driving claw 22 to rotate while being in the slideway 221; the driving claw 22 is driven to be radially opened, then the downhole switch tool 6 is driven to axially move upwards through axial driving, the inner sliding sleeve 52 is hooked to axially move relative to the outer sliding sleeve 51, and when the outer sliding sleeve 51 and the inner sliding sleeve 52 axially move, the inner sliding sleeve 52 rotates relative to the outer sliding sleeve 51 under the combined action of the guide structure 12, the groove structure 513, the guide table 524 and the positioning clamp 53, so that the second through hole 521 is communicated with the first through hole 511, and the infinite mechanical switch fracturing sliding sleeve 5 is opened.
After the infinite mechanical switch fracturing sliding sleeve 5 is opened, the underground switch tool 6 can be taken out from the inner cavity of the inner sliding sleeve 52 or other infinite mechanical switch fracturing sliding sleeves 5 can be continuously opened according to requirements. And after the underground switch tool 6 is taken out from the infinite mechanical switch fracturing sliding sleeve 5, fracturing fluid is introduced into the infinite mechanical switch fracturing sliding sleeve 5 to perform fracturing work.
When the infinite mechanical switch fracturing sliding sleeve 5 needs to be closed, the underground switch tool 6 is deeply inserted into the infinite mechanical switch fracturing sliding sleeve 5, and the infinite mechanical switch fracturing sliding sleeve 5 can be closed by repeatedly opening the action of the infinite mechanical switch fracturing sliding sleeve 5. As shown in fig. 13, the groove structure 513 includes a first limiting groove 5131 and a second limiting groove 5132 uniformly distributed along the circumference of the inner wall of the outer sliding sleeve 51, wherein the first limiting groove 5131 and the second limiting groove 5132 are arranged at intervals, the inner sliding sleeve 52 axially reciprocates once, and the guide table 524 runs from one of the first limiting groove 5131 and the second limiting groove 5132 to the other, so as to open the infinite mechanical switch fracturing sliding sleeve 5 or close the infinite mechanical switch fracturing sliding sleeve 5. When the inner sliding sleeve 52 rotates a circle along the outer sliding sleeve 51, the number of times of opening and closing the infinite mechanical switch fracturing sliding sleeve 5 is the same as the number of the first limit groove 5131 or the second limit groove 5132. In order to ensure the reliability of the switch of the infinite mechanical switch fracturing sliding sleeve 5, the inner sliding sleeve 52 needs to rotate in one direction in the inner sliding sleeve 52, therefore, the underground switch tool 6 is provided with the non-return structure 3, the rotating part 2 of the underground switch tool 6 rotates in one direction relative to the fixed part 1, when the infinite mechanical switch fracturing sliding sleeve 5 is opened or closed, the inner sliding sleeve 52 is hooked by the driving claw 22, and the rotating part 2 and the inner sliding sleeve 52 rotate in the circumferential direction while moving axially along the outer sliding sleeve 51.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention. Including each of the specific features, are combined in any suitable manner. The invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.
Claims (11)
1. An infinite-stage mechanical switch fracturing sliding sleeve is characterized by being used for a shale oil three-dimensional development fracturing tool, wherein the shale oil three-dimensional development fracturing tool comprises an outer sliding sleeve (51), an inner sliding sleeve (52) and a positioning clamp (53), wherein the outer sliding sleeve (51), the inner sliding sleeve (52) and the positioning clamp are coaxially sleeved with each other, the positioning clamp is fixedly connected to a first end of the outer sliding sleeve (51), and the positioning clamp is used for limiting a first limit distance of the inner sliding sleeve (52) moving towards the first end of the outer sliding sleeve (51); the outer sliding sleeve (51) is provided with a first through hole (511), the inner sliding sleeve (52) is provided with a second through hole (521), and when the infinite mechanical switch fracturing sliding sleeve (5) is axially driven by the inner sliding sleeve (52), the inner sliding sleeve (52) axially moves under the combined action of the outer sliding sleeve (51) and the positioning clamp (53) and circumferentially rotates at the same time, so that the infinite mechanical switch fracturing sliding sleeve (5) can be switched between an opening state in which the first through hole (511) is communicated with the second through hole (521) and a closing state in which the first through hole (511) is disconnected from the second through hole (521), wherein the first through hole (511) and the second through hole (521) are circumferentially spaced by a first angle in the closing state.
2. The infinite mechanical switch fracturing sliding sleeve as recited in claim 1, wherein the locator card (53) and the outer sliding sleeve (51) are detachably connected.
3. The infinite mechanical switch fracturing sliding sleeve according to claim 2, wherein one end of the outer sliding sleeve (51) facing the locator card (53) comprises a first tapered sleeve (516) with a tapered inner surface, and the inner wall of the first tapered sleeve (516) is provided with an internal thread; one end of the positioning clamp (53) facing the outer sliding sleeve (51) comprises a second conical sleeve (533) with a conical outer surface, and the outer wall of the second conical sleeve (533) is provided with an external thread; the positioning clamp (53) and the outer sliding sleeve (51) are in threaded connection through the second tapered sleeve (533) and the first tapered sleeve (516).
4. The infinite mechanical switch fracturing sliding sleeve according to claim 3, wherein the outer sliding sleeve (51) and the inner sliding sleeve (52) have a first contact surface (512) and a second contact surface (522) which are opposite to each other and can contact each other under an external force and move relatively along a first track.
5. The infinite mechanical switch fracturing sliding sleeve according to claim 4, wherein the infinite mechanical switch fracturing sliding sleeve (5) contacts the first contact surface (512) and the second contact surface (522) under the action of axial force and moves relatively along the first track, and the outer sliding sleeve (51) and the inner sliding sleeve (52) rotate relatively by a second angle.
6. The infinite mechanical switch fracturing sliding sleeve as recited in claim 5, wherein the inner sliding sleeve (52) and the positioning clip (53) have a third contact surface (523) and a fourth contact surface (531) which are opposite to each other and can contact each other under an external force and move relatively along a second track.
7. The infinite mechanical switch fracturing sliding sleeve according to claim 6, wherein the infinite mechanical switch fracturing sliding sleeve (5) contacts the third contact surface (523) and the fourth contact surface (531) under the action of axial force and moves relatively along the second track, the outer sliding sleeve (51) rotates relatively to the inner sliding sleeve (52) by a third angle, and the sum of the second angle and the third angle is equal to the first angle.
8. The infinite mechanical switch fracturing sliding sleeve according to claim 7, wherein the inner sliding sleeve (52) comprises a guide table (524) disposed on an outer wall of the inner sliding sleeve (52), the second contact surface (522) and the third contact surface (523) being formed on the guide table (524); a groove structure (513) for accommodating the guide table (524) is formed on the inner wall of the outer sliding sleeve (51), the groove structure (513) comprises a first limiting groove (5131) and a second limiting groove (5132) which are circumferentially arranged at intervals to limit the axial position of the guide table (524) in the groove structure (513) in different working states, and the first contact surface (512) is circumferentially connected with the first limiting groove (5131) and the second limiting groove (5132); the positioning clip (53) comprises an axially extending guide tooth (532), the fourth contact surface (531) being formed on the guide tooth (532).
9. The infinite mechanical switch fracturing sleeve of claim 7, wherein the inner sleeve (52) and the locator card (53) are spaced apart along the axis, the first contact surface (512) deflects in a first direction circumferentially away from a first end of the locator card (53) and toward a second end of the locator card (53); the first end of the fourth contact surface (531) departing from the inner sliding sleeve (52) and the second end of the fourth contact surface facing the inner sliding sleeve (52) are circumferentially deviated towards the first direction.
10. The infinite mechanical switch fracturing sliding sleeve according to claim 8 or 9, wherein the infinite mechanical switch fracturing sliding sleeve (5) comprises a return spring (54) extending axially to drive the inner sliding sleeve (52) to reset axially, and both ends of the return spring (54) are respectively connected with the inner sliding sleeve (52) and the positioning clamp (53).
11. A shale oil three-dimensional development fracturing tool, characterized in that the shale oil three-dimensional development fracturing tool comprises an infinite mechanical switch fracturing sliding sleeve (5) according to any one of claims 1-10 and a downhole switch tool for driving the infinite mechanical switch fracturing sliding sleeve (5) to be opened or closed.
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| CN202110343051.4A CN112943201B (en) | 2021-03-30 | 2021-03-30 | Fracturing sliding sleeve of infinite-level mechanical switch and shale oil three-dimensional development fracturing tool |
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