Blasthole liquid injection type fracturing device and operation method thereof

Abstract

The invention discloses a shot hole liquid injection type fracturing device and an operation method thereof, and relates to the technical field of fracturing devices.The device comprises a fracturing body, the fracturing body is provided with an inner sleeve and a rotating sleeve rotationally connected with the inner sleeve, the end, away from the well bottom, of the inner sleeve is open, and the end, close to the well bottom, of the rotating sleeve is closed; a liquid outlet hole is formed in the side wall of the rotating sleeve; the power unit is used for driving the rotating sleeve to rotate relative to the inner sleeve; the shot hole identification piece is connected with the rotating sleeve, and the shot hole identification piece is used for determining the position of a shot hole in a shaft casing; the insertion mechanism is provided with a telescopic pipe and a driving part, the telescopic pipe is communicated with the liquid outlet hole, and the driving part is used for driving the telescopic pipe to extend or retract. The telescopic pipe is driven by the driving piece to extend and be inserted into the shot hole, so that fracturing fluid is directly injected into the stratum through the telescopic pipe and the shot hole, the pressure loss of the fracturing fluid is reduced, and the fracturing effect is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of fracturing devices, and in particular to a blasthole liquid injection type fracturing device and an operating method thereof. Background Art

[0002] The fracturing device is a set of professional equipment used in the development of oil and gas fields. It is mainly used to inject fracturing fluid into the formation under high pressure to create cracks in the formation, thereby increasing the permeability of oil and gas and achieving the purpose of increasing production.

[0003] Perforating is the process of creating holes in the casing of an oil and gas well that provide pathways for the fracturing fluid to enter the formation.

[0004] At present, the common fracturing operation method is: a packer is placed above and below the blasthole inside the casing, and then the fracturing fluid is injected into the closed space defined by the two packers. The fracturing fluid then penetrates into the formation through the blasthole to achieve fracturing treatment of the formation. However, this fracturing operation method has the following shortcomings:

[0005] First, during the fracturing process, the fracturing fluid first needs to fill the casing space between the two packers before it can further pass through the blasthole to reach the formation. However, the blasthole aperture is relatively small, and the fracturing fluid faces greater resistance when passing through the blasthole, resulting in the high pressure inside the casing being difficult to be fully transmitted to the formation, thereby causing pressure loss when passing through the blasthole. This pressure loss weakens the actual pressure of the drilling fluid on the formation, thereby affecting the ultimate effectiveness of fracturing.

[0006] Secondly, the installation and subsequent removal of the packer are cumbersome, which not only increases the complexity of the fracturing operation, but also reduces the overall operation efficiency. The lowering and drilling out of the packer requires additional time and resources, which restricts the overall progress of the fracturing operation. Summary of the invention

[0007] The purpose of the present invention is to provide a blasthole liquid injection type fracturing device and an operating method thereof, so as to at least solve the problems of low efficiency and poor effect of fracturing operation in the existing oil and gas field development.

[0008] The above-mentioned purpose of the present invention can be achieved by adopting the following technical solutions:

[0009] The present invention provides a blasthole liquid injection type fracturing device, comprising: a fracturing body, comprising an inner sleeve and a rotating sleeve rotatably connected to the inner sleeve, wherein the inner sleeve is open at one end away from the well bottom, and the rotating sleeve is closed at one end close to the well bottom, and a liquid outlet hole is provided on the side wall of the rotating sleeve; a power unit, used for driving the rotating sleeve to rotate relative to the inner sleeve; a blasthole identification member, connected to the rotating sleeve, and used for determining the position of the blasthole on the wellbore casing; an insertion mechanism, comprising a telescopic tube and a driving member, the telescopic tube is connected to the liquid outlet hole, and the driving member is used for driving the telescopic tube to extend or shorten.

[0010] Preferably, the telescopic tube comprises a plurality of sleeves which are sequentially sleeved along the extension direction and have gradually decreasing diameters, and a sealing gasket arranged between two adjacent sleeves. The sealing gasket is fixedly connected to the sleeve with a relatively small diameter, and a sliding connection is formed between the sealing gasket and the sleeve with a relatively large diameter.

[0011] Preferably, a push plate is sealedly connected to the outer wall of the casing with the smallest diameter, the driving member is connected between the push plate and the rotating sleeve, a sealing ring is provided on the side of the push plate close to the wellbore casing, and when the telescopic tube is extended and inserted into the blasthole, a sealed cavity covering the blasthole is formed between the sealing ring and the push plate.

[0012] Preferably, along the axial direction, the blast hole identification member and the liquid outlet are spaced apart, and the center line of the blast hole identification member coincides with the center line of the liquid outlet; the blast hole identification member is electrically connected to the power unit, and when the blast hole identification member identifies the blast hole, the power unit stops outputting driving force.

[0013] Preferably, the fracturing body further comprises an outer sleeve sleeved outside the inner sleeve, and an annular sealing chamber for accommodating the power unit is formed between the inner sleeve and the outer sleeve.

[0014] Furthermore, the blasthole injection fracturing device also includes a centering assembly, which includes a plurality of branch components, and the plurality of branch components are evenly distributed on the outer side wall of the outer sleeve along the circumferential direction, and each of the branch components can elastically abut against the wellbore casing.

[0015] Preferably, the branch assembly comprises a support arm and an elastic member, one end of the support arm is hinged to the outer sleeve, the other end of the support arm is rotatably provided with a ball, and the elastic member is fixedly connected between the support arm and the outer sleeve.

[0016] Preferably, the power unit comprises a driving motor, a reducer, a gear and a ring gear which are sequentially connected in transmission, a housing of the driving motor is fixedly connected to the inner sleeve, and the ring gear is coaxially fixedly connected to the rotating sleeve.

[0017] The present invention also provides an operating method for the blasthole liquid injection type fracturing device as described above, comprising: lowering the blasthole liquid injection type fracturing device into the wellbore casing; turning on the power unit to drive the rotating sleeve to rotate, and continuing to move the blasthole liquid injection type fracturing device downward so that the blasthole identification member moves downward along a spiral path; when the blasthole identification member detects a blasthole on the wellbore casing, axially moving the blasthole liquid injection type fracturing device a distance between the liquid outlet and the blasthole identification member so that the liquid outlet is aligned with the blasthole; turning on the driving member to drive the telescopic tube to extend and insert into the blasthole; injecting fracturing fluid into the inner sleeve to fractur the formation.

[0018] Specifically, axially moving the blasthole liquid injection fracturing device the distance between the fluid outlet hole and the blasthole identification piece includes: when the blasthole identification piece is arranged close to the bottom of the well, axially moving the blasthole liquid injection fracturing device downward the distance between the fluid outlet hole and the blasthole identification piece; when the fluid outlet hole is arranged close to the bottom of the well, axially moving the blasthole liquid injection fracturing device upward the distance between the fluid outlet hole and the blasthole identification piece.

[0019] The characteristics and advantages of the present invention are as follows: the blasthole liquid injection fracturing device provided by the present invention drives the telescopic tube to extend and be inserted into the blasthole through the driving member, so that the fracturing fluid is directly injected into the blasthole through the liquid outlet hole and the telescopic tube, so as to save the use amount of fracturing fluid and reduce the pressure loss of fracturing fluid, thereby ensuring the fracturing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a schematic diagram of the structure of a blasthole liquid injection type fracturing device provided in an embodiment of the present invention;

[0022] Figure 2 for Figure 1 A partial enlarged view of

[0023] Figure 3 It is a schematic diagram of the connection between the insertion mechanism and the rotating sleeve of the blasthole liquid injection type fracturing device provided in an embodiment of the present invention;

[0024] Figure 4 It is a schematic diagram of the blasthole liquid injection type fracturing device provided in an embodiment of the present invention in a fracturing operation state.

[0025] Description of Figure Numbers:

[0026] 1. Fracturing body; 11. Inner sleeve; 111. Connecting end; 12. Rotating sleeve; 121. Liquid outlet; 122. Shoulder; 13. Bearing; 14. Outer sleeve; 15. End plate;

[0027] 2. Power unit; 21. Drive motor; 22. Reducer; 23. Gear; 24. Ring gear;

[0028] 3. Blast hole identification parts;

[0029] 4. Insertion mechanism; 41. Telescopic tube; 411. Sealing pad; 412. Outer tube; 413. Middle tube; 414. Inner tube; 42. Driving member; 43. Push plate; 44. Sealing ring;

[0030] 5. Centering assembly; 51. Branch assembly; 511. Support arm; 512. Elastic member; 513. Ball;

[0031] 6. Wellbore casing; 61. Blast hole

[0032] 7. Drill rod. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] like Figures 1 to 4As shown, the present invention provides a blasthole liquid injection type fracturing device, including a fracturing body 1, a power unit 2, a blasthole identification member 3 and an insertion mechanism 4. The fracturing body 1 has an inner sleeve 11 and a rotating sleeve 12 rotatably connected to the inner sleeve 11. The inner sleeve 11 is open at one end away from the bottom of the well for the fracturing fluid to enter. The rotating sleeve 12 is closed at one end close to the bottom of the well by a sealing plate. A liquid outlet 121 is provided on the side wall of the rotating sleeve 12 so that the fracturing fluid entering the device can only flow out from the liquid outlet 121. The power unit 2 is used to drive the rotating sleeve 12 to rotate relative to the inner sleeve 11. The blasthole identification member 3 is connected to the rotating sleeve 12, so that the blasthole identification member 3 can rotate with the rotating sleeve 12 to facilitate the blasthole identification member 3 to identify the blasthole 61 on the wellbore casing 6, and the circumferential position of the blasthole identification member 3 on the rotating sleeve 12 is overlapped with the circumferential position of the liquid outlet 121 on the rotating sleeve 12, so as to realize the alignment operation of the liquid outlet 121 and the blasthole 61 through simple axial movement. The insertion mechanism 4 has a telescopic tube 41 and a driving member 42, the telescopic tube 41 is connected to the liquid outlet 121, and the driving member 42 is used to drive the telescopic tube 41 to extend or shorten, and the telescopic tube 41 is extended and inserted into the blasthole 61 by the driving member 42, so that the fracturing fluid is directly injected into the blasthole 61 through the liquid outlet 121 and the telescopic tube 41, so as to save the use of fracturing fluid and reduce the pressure loss of fracturing fluid, improve economic benefits and fracturing effect, and after the fracturing operation is completed, the telescopic tube 41 is shortened and reset by the driving member 42.

[0035] Among them, Figure 1 and Figure 2 As shown, the rotating sleeve 12 is rotatably connected to the inner sleeve 11 through the bearing 13 to achieve smooth rotation of the rotating sleeve 12, while preventing axial movement between the rotating sleeve 12 and the inner sleeve 11, which may affect the fracturing operation or even cause separation. Furthermore, along the axial direction, multiple sealing rings are embedded between the rotating sleeve 12 and the inner sleeve 11 at intervals to ensure the sealing of the fracturing fluid flow channel inside the device.

[0036] Specifically, Figure 1 and Figure 4As shown, a plurality of liquid outlet holes 121 are provided on the side wall of the rotating sleeve 12, and the plurality of liquid outlet holes 121 are arranged at intervals along the circumferential direction of the rotating sleeve 12. The circumferential arrangement positions of the plurality of liquid outlet holes 121 on the rotating sleeve 12 correspond to the circumferential arrangement positions of the plurality of blastholes 61 on the wellbore casing 6. Correspondingly, a plurality of blasthole identification members 3 are arranged at intervals on the side wall of the rotating sleeve 12, and an insertion mechanism 4 is provided on each liquid outlet hole 121. Accurate alignment of each liquid outlet hole 121 with each blasthole 61 is achieved through the plurality of blasthole identification members 3. When the center line of the inserted blasthole liquid injection fracturing device is aligned with the center line of the wellbore casing 6 and the liquid outlet hole 121 is aligned with the blasthole 61, the drive members 42 of each insertion mechanism 4 can be controlled to open synchronously, so that the telescopic tubes 41 connected to each liquid outlet hole 121 are extended at the same time, and each telescopic tube 41 is inserted into the corresponding blasthole 61 at the same time, saving fracturing operation time and improving efficiency. Among them, when the blastholes 61 on the wellbore casing 6 are evenly distributed in the circumferential direction, it is only necessary to align one of the multiple liquid outlet holes 121 with one of the multiple blastholes 61 to synchronously open the driving members 42 and realize the simultaneous insertion of the telescopic tubes 41 into the corresponding blastholes 61.

[0037] Preferably, in order to ensure a high recognition accuracy, the blasthole identification element 3 uses an ultrasonic rangefinder. When in use, the ultrasonic rangefinder continuously detects the distance between it and the inner wall of the wellbore casing 6. When a distance mutation occurs and the mutation distance is greater than a preset distance range (the conventional distance range between the ultrasonic rangefinder and the inner wall), it indicates that the blasthole 61 is detected.

[0038] According to a preferred embodiment of the present invention, the blasthole identification member 3 and the liquid outlet 121 are spaced apart in the axial direction, and the center line of the blasthole identification member 3 coincides with the center line of the liquid outlet 121, that is, the circumferential position of the blasthole identification member 3 on the rotating sleeve 12 coincides with the circumferential position of the liquid outlet 121 on the rotating sleeve 12. Further, the blasthole identification member 3 is electrically connected to the power unit 2, and when the blasthole identification member 3 identifies the blasthole 61, the power unit 2 stops outputting the driving force. In this way, when the blasthole identification member 3 detects the blasthole 61 on the wellbore casing 6, the rotating sleeve 12 stops rotating, and the blasthole 121 can be aligned with the blasthole 61 by axially moving the blasthole liquid injection fracturing device by the distance between the liquid outlet 121 and the blasthole identification member 3.

[0039] According to a preferred embodiment of the present invention, the power unit 2 includes a driving motor 21, a reducer 22, a gear 23 and a ring gear 24 which are sequentially connected in transmission. The housing of the driving motor 21 is fixedly connected to the inner sleeve 11, and the ring gear 24 is coaxially fixedly connected to the rotating sleeve 12. Specifically, Figure 1 and Figure 2As shown, the housing of the drive motor 21 is fixed on the inner sleeve 11, the output shaft of the drive motor 21 is connected to the input end of the reducer 22, the output end of the reducer 22 is coaxially fixedly connected to the gear 23, the gear 23 is meshed with the ring gear 24, the ring gear 24 is coaxially fixedly connected to the rotating sleeve 12, when in use, under the driving force output of the drive motor 21, the reducer 22 drives the gear 23 to rotate, the gear 23 drives the ring gear 24 to rotate and then drives the rotating sleeve 12 to rotate. The reducer 22 is provided to increase the torque of the drive motor 21, thereby reducing the performance requirements of the drive motor 21.

[0040] According to a preferred embodiment of the present invention, the telescopic tube 41 includes a multi-stage casing that is sequentially sleeved and has a gradually decreasing diameter along the extension direction and a sealing gasket 411 disposed between two adjacent stages of the casing, the sealing gasket 411 is fixedly connected to the casing with a relatively small diameter, and a sliding connection is formed between the sealing gasket 411 and the casing with a relatively large diameter. By providing a multi-stage casing that is sequentially sleeved and has a gradually decreasing diameter along the extension direction, the blasthole injection type fracturing device can be smoothly lowered, and the pressure-gathering effect brought about by the reduction in diameter of the telescopic tube 41 can be fully utilized to increase the speed of the fracturing fluid spraying.

[0041] Specifically, Figure 3 As shown, the telescopic tube 41 includes an outer tube 412, a middle tube 413 and an inner tube 414 which are sequentially sleeved in the extension direction and have gradually reduced diameters. The telescopic tube 41 is connected and conducted with the liquid outlet 121 through the outer tube 412. The driving member 42 is connected between the outer wall of the rotating sleeve 12 and the inner tube 414. Under the drive of the driving member 42, the middle tube 413 and the inner tube 414 are sequentially extended or retracted, thereby realizing the telescopic function. In addition, a first sealing gasket 411 is arranged between the outer tube 412 and the middle tube 413. The first sealing gasket 411 is fixedly sleeved on the outer wall of the middle tube 413 and is slidably connected to the inner wall of the outer tube 412. Similarly, a second sealing gasket 411 is arranged between the middle tube 413 and the inner tube 414. The second sealing gasket 411 is fixedly sleeved on the outer wall of the inner tube 414 and is slidably connected to the inner wall of the middle tube 413. In this way, the telescopic smoothness requirement and the sealing requirement of the telescopic tube 41 are taken into consideration, thereby reducing the pressure loss of the fracturing fluid.

[0042] According to a preferred embodiment of the present invention, a push plate 43 is sealed and connected to the outer wall of the casing with the smallest diameter, a driving member 42 is connected between the push plate 43 and the rotating sleeve 12, and a sealing ring 44 is provided on the side of the push plate 43 close to the wellbore casing 6. When the telescopic tube 41 is extended and inserted into the blasthole 61, a sealed cavity covering the blasthole 61 is formed between the sealing ring 44 and the push plate 43. In this way, when the driving member 42 drives the telescopic tube 41 to extend to the end of the telescopic tube 41 through the push plate 43 and inserts into the blasthole 61, the sealing ring 44 will also contact the inner wall of the wellbore casing 6 at the orifice of the blasthole 61, thereby sealing the orifice of the blasthole 61 to prevent the fracturing fluid injected into the blasthole 61 from overflowing, thereby ensuring the pressure of the fracturing fluid in the blasthole 61 and improving the fracturing effect.

[0043] Preferably, the driving member 42 is a push-pull hydraulic cylinder, the push plate 43 is sealedly sleeved on the outer wall of the inner tube 414, the cylinder body of the push-pull hydraulic cylinder is fixedly connected to the outer wall of the rotating sleeve 12, and the output shaft of the push-pull hydraulic cylinder is fixedly connected to the push plate 43. Figure 1 As shown, there are two driving members 42 symmetrically arranged on both sides of the telescopic tube 41 along the axial direction.

[0044] According to a preferred embodiment of the present invention, the fracturing body 1 further comprises an outer sleeve 14 sleeved outside the inner sleeve 11, and an annular sealed cavity for accommodating the power unit 2 is formed between the inner sleeve 11 and the outer sleeve 14. Figure 1 and Figure 2 As shown, the end of the inner sleeve 11 away from the bottom of the well extends radially outward to form a connection end 111 connected to the drill pipe 7, the outer sleeve 14 is sleeved outside the inner sleeve 11, the upper end of the outer sleeve 14 is in contact with the connection end 111, the lower end of the outer sleeve 14 is connected to the end plate 15, the end plate 15 is provided with a center hole for the rotating sleeve 12 to pass through, the end of the rotating sleeve 12 away from the bottom of the well extends radially outward to form a shoulder 122 supported on the end plate 15, the rotating sleeve 12 is fixedly connected to the gear ring 24 through the shoulder 122, and a sealing ring is also provided between the gear ring 24 and the outer sleeve 14. In this way, an annular sealing chamber is formed between the inner sleeve 11 and the outer sleeve 14, and the power unit 2 is accommodated in the annular sealing chamber to protect it, thereby extending the service life of the power unit 2.

[0045] According to a preferred embodiment of the present invention, the blasthole injection type fracturing device further includes a centering assembly 5, which includes a plurality of branch assemblies 51, which are evenly distributed on the outer wall of the outer sleeve 14 along the circumferential direction, and each branch assembly 51 can elastically abut against the wellbore casing 6. By providing a plurality of branch assemblies 51 evenly distributed along the circumferential direction and elastically abutting against the wellbore casing 6, the center line of the device is always kept coincident with the center line of the wellbore casing 6 during the process of lowering the blasthole injection type fracturing device, thereby ensuring that each telescopic tube 41 can be simultaneously inserted into the corresponding blasthole 61. In this embodiment, along the axial direction, a plurality of centering assemblies 5 are arranged at intervals on the outer wall of the outer sleeve 14, so as to better achieve the alignment of the center lines of the blasthole injection type fracturing device and the wellbore casing 6.

[0046] According to a preferred embodiment of the present invention, Figure 1 As shown, the branch assembly 51 includes a support arm 511 and an elastic member 512. One end of the support arm 511 is hinged to the outer sleeve 14, and the other end of the support arm 511 is rotatably provided with a ball 513. The elastic member 512 is fixedly connected between the support arm 511 and the outer sleeve 14. Specifically, the end of each support arm 511 contacts the inner wall of the wellbore casing 6 through the ball 513 to ensure that the center line of the blasthole injection type fracturing device is aligned with the center line of the wellbore casing 6. If the inner diameter of the wellbore casing 6 decreases, the support arm 511 is retracted and the elastic member 512 is contracted. If the inner diameter of the wellbore casing 6 increases, the elastic member 512 pushes the support arm 511 to open, thereby adapting to different inner diameters of the wellbore casing 6. By arranging the ball 513 on the support arm 511, the resistance between the branch assembly 51 and the inner wall of the wellbore casing 6 is reduced, so as to facilitate the rapid and smooth lowering of the blasthole injection type fracturing device.

[0047] The present invention also provides an operating method for the above-mentioned blasthole liquid injection fracturing device, comprising: lowering the blasthole liquid injection fracturing device into the wellbore casing 6; turning on the power unit 2, driving the rotating sleeve 12 to rotate, and continuing to move the blasthole liquid injection fracturing device downward, so that the blasthole identification member 3 moves downward along a spiral path; when the blasthole identification member 3 detects the blasthole 61 on the wellbore casing 6, the blasthole liquid injection fracturing device is axially moved the distance between the liquid outlet 121 and the blasthole identification member 3, so that the liquid outlet 121 is aligned with the blasthole 61; turning on the driving member 42, driving the telescopic tube 41 to extend and insert into the blasthole 61; injecting fracturing fluid into the inner sleeve 11 to fractur the formation.

[0048] Specifically, the operation method of the blasthole liquid injection fracturing device includes: installing the blasthole liquid injection fracturing device on the drill pipe 7 through the connecting end 111 of the inner sleeve 11, and then lowering the drill pipe 7 into the wellbore casing 6 through the driving device, and driving the blasthole liquid injection fracturing device to move downward continuously through the drill pipe 7. During the downward movement, the blasthole liquid injection fracturing device is located at the center of the wellbore casing 6 through the centering assembly 5, and at the same time, the rotating sleeve 12 is driven to rotate by the power unit 2. When the rotating sleeve 12 rotates, it drives the blasthole identification member 3 to rotate, so that the blasthole identification member 3 can move downward along a spiral path; during the spiral downward movement of the blasthole identification member 3, when the blasthole identification member 3 detects the blasthole on the wellbore casing 6, 61, the rotating sleeve 12 stops rotating, and then the driving device is used to move the drill pipe 7 in the axial direction by a preset distance (the distance between the liquid outlet 121 and the blasthole identification member 3), at which time the liquid outlet 121 is aligned with the blasthole 61; then the driving member 42 drives the telescopic tube 41 to extend to the end of the telescopic tube 41 and insert it into the blasthole 61, and the sealing ring 44 will also contact the inner wall of the wellbore at the orifice of the blasthole 61, thereby sealing the orifice of the blasthole 61; thereafter, fracturing fluid is injected into the drill pipe 7, and the fracturing fluid flows into the inner sleeve 11, the rotating sleeve 12, the liquid outlet 121 and the telescopic tube 41 in sequence through the drill pipe 7, and is pressurized by the telescopic tube 41 and injected into the formation through the blasthole 61 to fractur the formation.

[0049] Among them, axially moving the blasthole liquid injection fracturing device the distance between the liquid outlet hole 121 and the blasthole identification piece 3 includes: when the blasthole identification piece 3 is set close to the bottom of the well, axially moving the blasthole liquid injection fracturing device downwardly the distance between the liquid outlet hole 121 and the blasthole identification piece 3 to achieve alignment of the liquid outlet hole 121 and the blasthole 61; when the liquid outlet hole 121 is set close to the bottom of the well, axially moving the blasthole liquid injection fracturing device upwardly the distance between the liquid outlet hole 121 and the blasthole identification piece 3 to achieve alignment of the liquid outlet hole 121 and the blasthole 61.

[0050] In the present invention, since the fracturing fluid is directly injected into the formation through the interconnected telescopic tube 41 and the blasthole 61, the fracturing fluid does not need to fill the wellbore casing 6, which can reduce the pressure loss of the fracturing fluid when passing through the blasthole 61 and ensure the fracturing effect; and, through the concentrated pressure of the fracturing fluid by the telescopic tube 41 and the sealing of the blasthole 61 by the sealing ring 44, the pressure of the fracturing fluid in the blasthole 61 is increased, and the fracturing effect is improved; at the same time, the installation and subsequent removal of the packer are omitted, which is conducive to speeding up the overall progress of the fracturing operation; in addition, by providing the centering assembly 5, the blasthole injection type fracturing device is centered in the wellbore casing 6, and when the liquid outlet 121 is aligned with the blasthole 61, the drive members 42 of each insertion mechanism 4 can be controlled to open synchronously, so that the telescopic tubes 41 connected to each liquid outlet 121 are extended at the same time, and each telescopic tube 41 is inserted into the corresponding blasthole 61 at the same time, saving fracturing operation time and improving efficiency.

[0051] The above are only several embodiments of the present invention. Those skilled in the art may make various changes or modifications to the embodiments of the present invention based on the contents disclosed in the application documents without departing from the spirit and scope of the present invention.

Claims

1. A blasthole liquid injection fracturing device, characterized in that: include: The fracturing body comprises an inner sleeve and a rotating sleeve rotatably connected to the inner sleeve, wherein the inner sleeve is open at one end away from the bottom of the well, and the rotating sleeve is closed at one end close to the bottom of the well, and a liquid outlet hole is provided on the side wall of the rotating sleeve; A power unit, used for driving the rotating sleeve to rotate relative to the inner sleeve; A blasthole identification member connected to the rotating sleeve, the blasthole identification member being used to determine the position of the blasthole on the wellbore casing; The insertion mechanism comprises a telescopic tube and a driving member, wherein the telescopic tube is communicated with the liquid outlet, and the driving member is used for driving the telescopic tube to extend or shorten.

2. The blasthole liquid injection fracturing device according to claim 1, characterized in that: The telescopic tube includes a plurality of sleeves which are sequentially sleeved along the extension direction and have gradually decreasing diameters, and a sealing gasket arranged between two adjacent sleeves. The sealing gasket is fixedly connected to the sleeve with a relatively small diameter, and a sliding connection is formed between the sealing gasket and the sleeve with a relatively large diameter.

3. The blasthole liquid injection fracturing device according to claim 2, characterized in that: A push plate is sealedly connected to the outer wall of the casing with the smallest diameter, the driving member is connected between the push plate and the rotating sleeve, a sealing ring is provided on the side of the push plate close to the wellbore casing, and when the telescopic tube is extended and inserted into the blasthole, a sealed cavity covering the blasthole is formed between the sealing ring and the push plate.

4. The blasthole liquid injection fracturing device according to claim 1, characterized in that: Along the axial direction, the blasthole identification member and the liquid outlet are spaced apart, and the center line of the blasthole identification member coincides with the center line of the liquid outlet; The blasthole identification element is electrically connected to the power unit, and when the blasthole identification element identifies a blasthole, the power unit stops outputting driving force.

5. The blasthole liquid injection fracturing device according to claim 1, characterized in that: The fracturing body also includes an outer sleeve sleeved outside the inner sleeve, and an annular sealing chamber for accommodating the power unit is formed between the inner sleeve and the outer sleeve.

6. The blasthole liquid injection fracturing device according to claim 5, characterized in that: The blasthole injection type fracturing device also includes a centering assembly, which includes a plurality of branch components. The plurality of branch components are evenly distributed on the outer side wall of the outer sleeve along the circumferential direction, and each branch component can elastically abut against the wellbore casing.

7. The blasthole liquid injection fracturing device according to claim 6, characterized in that: The branch assembly includes a support arm and an elastic member, one end of the support arm is hinged to the outer sleeve, the other end of the support arm is rotatably provided with a ball, and the elastic member is fixedly connected between the support arm and the outer sleeve.

8. The blasthole liquid injection fracturing device according to claim 1, characterized in that: The power unit comprises a driving motor, a reducer, a gear and a ring gear which are sequentially connected in transmission. The housing of the driving motor is fixedly connected to the inner sleeve, and the ring gear is coaxially fixedly connected to the rotating sleeve.

9. An operating method applied to the blasthole injection type fracturing device according to any one of claims 1 to 8, characterized in that: include: Lowering the blasthole liquid injection type fracturing device into the wellbore casing; Turning on the power unit to drive the rotating sleeve to rotate, and continuing to move the blasthole liquid injection type fracturing device downward, so that the blasthole identification member moves downward along a spiral path; When the blasthole identification element detects a blasthole on the wellbore casing, the blasthole injection type fracturing device is axially moved a distance between the fluid outlet and the blasthole identification element so that the fluid outlet is aligned with the blasthole; Turning on the driving member to drive the telescopic tube to extend and insert into the blast hole; A fracturing fluid is injected into the inner sleeve to fracture the formation.

10. The operating method of the blasthole liquid injection type fracturing device according to claim 9, characterized in that: The axial movement of the blasthole injection type fracturing device to a distance between the liquid outlet and the blasthole identification member comprises: When the blasthole identification member is arranged close to the bottom of the well, the blasthole liquid injection type fracturing device is axially moved downward by the distance between the liquid outlet and the blasthole identification member; When the fluid outlet is arranged close to the bottom of the well, the blasthole liquid injection type fracturing device is axially moved upward by the distance between the fluid outlet and the blasthole identification member.

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