Hydraulic fracturing device

Abstract

The present invention relates to the technical field of underground hydraulic fracturing in coal mines, and provides a hydraulic fracturing device, which includes: a first valve body is arranged in a connecting pipe, there is a gap between the outer wall of the rest side of the first valve body and the inner wall of the connecting pipe, a blind hole is arranged in the first valve body, a first through hole is arranged on the wall surface of the connecting pipe connected to the first valve body, a first pressure valve is arranged in the blind hole, and the first pressure valve is used to control the communication or cut-off of the first through hole and the first end of the connecting pipe; both ends of a first sliding rod are respectively connected to the connecting pipe and a driving mechanism; both ends of a second sliding rod are respectively connected to the connecting pipe and a drill bit, and a second pressure valve is arranged in the drill bit, and the second pressure valve is used to control the communication or cut-off of the drill bit and the second sliding rod. The above-mentioned hydraulic fracturing device can realize drilling operations when the liquid pressure is relatively small, and when the liquid pressure is relatively large, the liquid is ejected from the first through hole of the connecting pipe for fracturing operations, enabling the hydraulic fracturing device to have both drilling and fracturing functions at the same time, and improving the operation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of underground coal mine hydraulic fracturing, and particularly to a hydraulic fracturing device. Background Art

[0002] As an economical and effective hard and difficult-to-collapse roof control technology, hydraulic fracturing has been popularized and applied at home and abroad, and can make up for the deficiencies of technologies such as blasting. This technology has developed rapidly and has currently been popularized and applied in the fields of hard roof control, dynamic pressure roadway pressure relief, hard top coal weakening, etc., greatly improving the safety of mine production, and has shown good technical, economic and social benefits in production practice.

[0003] The current technical problems are as follows: Due to the constraints of the original shallow-hole hydraulic fracturing process in underground coal mines, the drilling, jet cutting, hole sealing, and fracturing process links are relatively independent. At present, there is no equipment and operation method in this field that can achieve the orderly integration of the above processes. The existing step-by-step operations lead to problems such as high labor intensity of workers, restricted fracturing scheme design, and safety risks for personnel. In addition, in order to fundamentally and effectively prevent and contain major accidents, "replacing people with mechanization and reducing people with automation" is the most effective way, which focuses on replacing manual operations with mechanized production and reducing human operations with automated control, and greatly improving the ability to ensure safe production. Summary of the Invention

[0004] The present invention provides a hydraulic fracturing device to solve the defect that the existing hydraulic fracturing device does not have multiple functions such as drilling, jet cutting, hole sealing, and fracturing.

[0005] The present invention provides a hydraulic fracturing device, comprising: a connecting pipe, both ends of the connecting pipe are communicated, a first valve body is arranged inside the connecting pipe, an outer wall on one side of the first valve body is coplanar with the inner wall of the connecting pipe, there is a gap between the outer walls on the remaining sides of the first valve body and the inner wall of the connecting pipe, a blind hole is arranged inside the first valve body, a first through hole is arranged on the wall surface of the connecting pipe connected to the first valve body, a first pressure valve is arranged inside the blind hole, and the first pressure valve is used to control the communication or cut-off of the first through hole and the first end of the connecting pipe; a first sliding rod, the first sliding rod is communicated with the first end of the connecting pipe; a second sliding rod, the first end of the second sliding rod is communicated with the second end of the connecting pipe; a drill bit, connected to the second end of the second sliding rod, a second pressure valve is arranged inside the drill bit, and the second pressure valve is used to control the communication or cut-off of the drill bit and the second sliding rod; when the liquid pressure is less than or equal to the working pressure of the second pressure valve, the first sliding rod, the connecting pipe, the second sliding rod and the drill bit are communicated to enable the drill bit to perform drilling operations; when the liquid pressure is greater than the working pressure of the first pressure valve, the first sliding rod, the connecting pipe and the second sliding rod are communicated, the connecting pipe is communicated with the first through hole, and the second sliding rod is cut off from the drill bit to enable the connecting pipe to perform fracturing operations, wherein the working pressure of the first pressure valve is greater than the working pressure of the second pressure valve.

[0006] According to a hydraulic fracturing device provided by the present invention, the first pressure valve comprises: a first valve core, a first plugging ball and a first elastic member arranged inside the blind hole, the first elastic member abuts against the bottom of the blind hole, the first plugging ball is located between the first valve core and the first elastic member, the first valve core is provided with a second through hole, and the second through hole is communicated with the connecting pipe; wherein, when the liquid pressure is less than or equal to the elastic force of the first elastic member, the first elastic member is in an extended state, along the flowing direction of the liquid, the first plugging ball is located upstream of the first through hole to cut off the communication between the first through hole and the second through hole;

[0007] When the liquid pressure is greater than the elastic force of the first elastic member, the first elastic member is in a compressed state, along the flowing direction of the liquid, the first plugging ball is located downstream of the first through hole to enable the communication between the first through hole and the second through hole.

[0008] According to a hydraulic fracturing device provided by the present invention, a first stepped hole is arranged inside the drill bit, the first stepped hole comprises a connected first large hole and a first small hole, the first large hole is adjacent to the second sliding rod, and the second pressure valve is arranged inside the first large hole, and the second pressure valve is used to control the communication or cut-off of the second sliding rod and the first small hole.

[0009] A hydraulic fracturing device provided according to the present invention, the second pressure valve includes: a second valve body disposed within the first large hole, a first tapered hole is provided within the second valve body, the large hole end of the first tapered hole faces the second sliding rod, and the small hole end of the first tapered hole communicates with the first small hole; a second valve core, a second plugging ball, and a second elastic member, the second valve core is provided with a third through hole, the third through hole communicates with the second sliding rod, the second valve core is disposed at the large hole end of the first tapered hole, the second elastic member is disposed at the small hole end of the first tapered hole, and the second plugging ball is disposed between the second valve core and the second elastic member; wherein, when the liquid pressure is less than or equal to the elastic force of the second elastic member, the second elastic member is in an extended state, there is a gap between the second plugging ball and the inner wall of the first tapered hole, and the second sliding rod communicates with the first small hole; when the liquid pressure is greater than the elastic force of the second elastic member, the second elastic member is in a compressed state, the second plugging ball abuts against the inner wall of the first tapered hole, and the second sliding rod is shut off from communicating with the first small hole.

[0010] A hydraulic fracturing device provided according to the present invention further includes a cutting mechanism, the first end of the cutting mechanism is detachably connected to the first sliding rod, and the second end of the cutting mechanism is for detachably connecting to the driving mechanism.

[0011] A hydraulic fracturing device provided according to the present invention, the cutting mechanism includes: a first cylinder body, a second stepped hole is provided within the first cylinder body, the second stepped hole includes a connected second large hole and a second small hole, the first sliding rod is detachably connected to the first cylinder body through the second small hole, and a plurality of fourth through holes are provided on the wall surface of the first cylinder body; a second cylinder body, hermetically connected to the first cylinder body, the second cylinder body is for detachably connecting to the driving mechanism; a third pressure valve, disposed within the first cylinder body and the second cylinder body, the third pressure valve is used to control the communication or shut-off communication between the fourth through holes and the second cylinder body; wherein, during drilling or fracturing operations, the fourth through holes are shut off from communicating with the second cylinder body, and during cutting operations, the fourth through holes communicate with the second cylinder body.

[0012] A hydraulic fracturing device provided according to the present invention, the third pressure valve includes: a third elastic member disposed within the second large hole; a third valve core provided with a second tapered hole, the second tapered hole communicating with the second cylinder, the large hole end of the second tapered hole facing the second cylinder, and the outer wall of the third valve core abutting against the inner wall of the first cylinder; a third blocking ball that can be disposed at the large hole end of the second tapered hole; wherein, in the case of drilling or fracturing operations, the third blocking ball is located outside the hydraulic fracturing device, the third elastic member is in an extended state, the third valve core blocks the fourth through hole, and the second cylinder, the second tapered hole, and the first cylinder communicate; in the case of cutting operations, the third blocking ball is disposed at the large hole end of the second tapered hole, and the third blocking ball abuts against the inner wall of the second tapered hole to cut off the communication between the second cylinder and the first cylinder, the third elastic member is in a compressed state, and along the liquid flow direction, the third valve core is located downstream of the fourth through hole, and the fourth through hole communicates with the second cylinder.

[0013] A hydraulic fracturing device provided according to the present invention further includes: a first expansion tube sleeved outside the first sliding rod, a fifth through hole provided on the wall surface of the first sliding rod, and the fifth through hole communicates with the first expansion tube; a first connection assembly for connecting both ends of the first expansion tube to the first sliding rod, and the first connection assembly is also used for detachably connecting to the driving mechanism.

[0014] The first connection assembly of a hydraulic fracturing device provided according to the present invention includes: a first connecting member sleeved outside the first sliding rod, a first insertion portion provided at the first end of the first connecting member, the first insertion portion being inserted into the first end of the first expansion tube, and the second end of the first connecting member being used for detachably connecting to the driving mechanism; a first pipe clamp sleeved outside the first end of the first expansion tube and opposite to the position of the first insertion portion; a second connecting member, the first end of the second connecting member being sleeved outside the second end of the first expansion tube, and the second end of the second connecting member being sleeved outside the first sliding rod and sealingly connected to the first sliding rod.

[0015] The first insertion portion of a hydraulic fracturing device provided according to the present invention includes a plurality of protrusions, and each protrusion has an inclined surface on the surface facing away from the first sliding rod, and the distance between the surface of the inclined surface close to the first end of the first connecting member and the first sliding rod is greater than the distance between the surface of the inclined surface close to the second end of the first connecting member and the first sliding rod.

[0016] A hydraulic fracturing device provided by the present invention further includes: a second expansion tube sleeved outside the second sliding rod, a sixth through hole is provided on the wall surface of the second sliding rod, and the sixth through hole communicates with the second expansion tube; a second connection assembly for connecting both ends of the second expansion tube to the second sliding rod.

[0017] In a hydraulic fracturing device provided by the present invention, the second connection assembly includes: a third connecting member sleeved outside the second sliding rod, a first end of the third connecting member is connected to a second end of the connecting pipe, a second insertion portion is provided at a second end of the third connecting member, and the second insertion portion is inserted into a first end of the second expansion tube; a second pipe clamp sleeved outside the first end of the second expansion tube and opposite to the position of the second insertion portion; a fourth connecting member, a first end of the fourth connecting member is sleeved outside a second end of the second expansion tube, and a second end of the fourth connecting member is sleeved outside the second sliding rod and is hermetically connected to the second sliding rod.

[0018] A hydraulic fracturing device provided by the present invention further includes a fifth connecting member, the fifth connecting member includes a first connecting portion and a second connecting portion connected in sequence, an outer diameter of the first connecting portion is smaller than an outer diameter of the second connecting portion, the first connecting portion is connected to a first end of the connecting pipe, and an end surface of the first end of the connecting pipe abuts against a side surface of the second connecting portion.

[0019] The hydraulic fracturing device provided by the embodiments of the present invention can perform drilling operations when the liquid pressure is relatively small by providing a first sliding rod, a connecting pipe, a second sliding rod, a drill bit, a first pressure valve, and a second pressure valve. When the liquid pressure is relatively large, the liquid is ejected from a first through hole of the connecting pipe for fracturing operations, enabling the hydraulic fracturing device to have both drilling and fracturing functions, realizing the process integration of drilling and fracturing operations, and improving the operation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 is a sectional view of the hydraulic fracturing device provided by the present invention;

[0022] Figure 2 is Figure 1 a partial enlarged view of part A in

[0023] Figure 3 is Figure 1Partial enlarged view at B in the [device / component name];

[0024] Figure 4 is Figure 1 Schematic structural diagram of the first connecting member shown in the [device / component name];

[0025] Figure 5 Schematic structural diagram of the cutting mechanism;

[0026] Figure 6 is Figure 5 Cross-sectional view of the [device / component name];

[0027] Reference numerals:

[0028] 10: connecting pipe; 11: first valve body; 12: gap; 13: blind hole; 14: first through hole; 20: first slide bar; 21: fifth through hole; 30: second slide bar; 31: sixth through hole; 40: drill bit; 41: first large hole; 42: first small hole; 50: first pressure valve; 51: first valve core; 52: first plugging ball; 53: first elastic member; 60: second pressure valve; 61: second valve body; 62: second valve core; 63: second plugging ball; 64: second elastic member; 71: first expansion pipe; 72: second expansion pipe; 80: first connecting member; 81: protrusion; 82: first insertion part; 90: first pipe clamp; 100: second connecting member; 110: third connecting member; 120: second pipe clamp; 130: fourth connecting member; 140: fifth connecting member; 200: cutting mechanism; 201: fourth through hole; 210: first cylinder; 211: second large hole; 212: second small hole; 220: second cylinder; 230: third pressure valve; 231: third elastic member; 232: third plugging ball; 233: third valve core. Detailed implementation manners

[0029] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] The terms "first" and "second" in the description and claims of the present invention may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0031] The following will describe the hydraulic fracturing device of the present invention in combination with Figures 1-6 the [device / component name].

[0032] As shown in Figure 1As shown in the figure, in an embodiment of the present invention, a hydraulic fracturing device includes: a connecting pipe 10, a first sliding rod 20, a second sliding rod 30, a drill bit 40, a first pressure valve 50, and a second pressure valve 60.

[0033] Both ends of the connecting pipe 10 are communicated. A first valve body 11 is provided in the connecting pipe 10. One outer wall of the first valve body 11 is coplanar with the inner wall of the connecting pipe 10. There is a gap 12 between the outer wall of the first valve body 11 and the inner wall of the connecting pipe 10. A blind hole 13 is provided in the first valve body 11. A first through hole 14 is provided on the wall surface of the connecting pipe 10 connected to the first valve body 11. The first pressure valve 50 is provided in the blind hole 13. The first pressure valve 50 is used to control the communication or cut-off of the first through hole 14 and the first end of the connecting pipe 10.

[0034] The first end of the first sliding rod 20 is communicated with the first end of the connecting pipe 10. The second end of the first sliding rod 20 is used for detachably connecting with a driving mechanism. The first end of the second sliding rod 30 is communicated with the second end of the connecting pipe 10. The drill bit 40 is connected to the second end of the second sliding rod 30. A second pressure valve 60 is provided in the drill bit 40. The second pressure valve 60 is used to control the communication or cut-off of the drill bit 40 and the second sliding rod 30.

[0035] When the liquid pressure is less than or equal to the working pressure of the second pressure valve 60, the first sliding rod 20, the connecting pipe 10, the second sliding rod 30, and the drill bit 40 are communicated to enable the drill bit 40 to perform drilling operations; when the liquid pressure is greater than the working pressure of the first pressure valve 50, the first sliding rod 20, the connecting pipe 10, and the second sliding rod 30 are communicated, the connecting pipe 10 is communicated with the first through hole 14, and the second sliding rod 30 is cut off from the drill bit 40 to enable the connecting pipe 10 to perform fracturing operations, wherein the working pressure of the first pressure valve 50 is greater than the working pressure of the second pressure valve 60.

[0036] Specifically, the connecting pipe 10 can be made by mechanical processing. Specifically, two blind holes are respectively processed at both ends of a solid pipe, and then a through hole is processed along the place close to the inner wall of the connecting pipe 10. This through hole is the gap 12 described in this embodiment. Then, both ends of the connecting pipe 10 are communicated. The unprocessed part in the connecting pipe 10 forms the first valve body 11. A blind hole 13 is processed in the first valve body 11 to make the blind hole 13 communicate with the first end of the connecting pipe 10. A first through hole 14 is processed on the wall surface of the connecting pipe 10 sharing the same wall with the blind hole. The first through hole 14 communicates with the blind hole 13. The first valve body 11 is provided in the blind hole 13. The first valve body 11 is used to control the communication or cut-off of the first through hole 14 and the first end of the connecting pipe 10.

[0037] In this embodiment, the working pressure of the first pressure valve 50 is greater than that of the second pressure valve 60. Optionally, the working pressure of the first pressure valve 50 can be set to 8 MPa, and the working pressure of the second pressure valve 60 can be set to 5 MPa. During operation, the driving mechanism is connected to the second end of the first slide bar 20. When the driving mechanism works, it provides liquid. When the liquid pressure is less than or equal to the working pressure of the second pressure valve 60, the first pressure valve 50 and the second pressure valve 60 do not act. The first pressure valve 50 blocks the first through hole 14, and the liquid flows from the driving mechanism through the gap 12 between the first slide bar 20 and the connecting pipe 10, the second slide bar 30, and the second pressure valve 60 into the drill bit 40. At this time, the drill bit 40 can perform drilling operations.

[0038] When the liquid pressure is greater than the working pressure of the first pressure valve 50, the first pressure valve 50 and the second pressure valve 60 act. Part of the liquid flows through the gap 12 into the second slide bar 30. At this time, the second pressure valve 60 shuts off the connection between the second slide bar 30 and the drill bit 40. The first pressure valve 50 releases the blockage of the first through hole 14, and the first through hole 14 communicates with the first end of the connecting pipe 10. The high-pressure liquid jets out from the first through hole 14, and the surrounding rock can be fractured.

[0039] The hydraulic fracturing device provided by the embodiment of the present invention can realize drilling operations when the liquid pressure is relatively small by setting the first slide bar, the connecting pipe, the second slide bar, the drill bit, the first pressure valve, and the second pressure valve. When the liquid pressure is relatively large, the liquid jets out from the first through hole of the connecting pipe for fracturing operations, enabling the hydraulic fracturing device to have both drilling and fracturing functions, realizing the process integration of drilling and fracturing operations, and improving the operation efficiency.

[0040] As Figure 2 shown, in the embodiment of the present invention, the first pressure valve 50 includes: a first valve core 51, a first blocking ball 52, and a first elastic member 53 disposed in the blind hole 13. The first elastic member 53 abuts against the bottom of the blind hole 13. The first blocking ball 52 is located between the first valve core 51 and the first elastic member 53. The first valve core 51 is provided with a second through hole, and the second through hole communicates with the connecting pipe 10. Among them, when the liquid pressure is less than or equal to the elastic force of the first elastic member 53, the first elastic member 53 is in an extended state. Along the flow direction of the liquid, the first blocking ball 52 is located upstream of the first through hole 14, so that the first through hole 14 is shut off from the second through hole; when the liquid pressure is greater than the elastic force of the first elastic member 53, the first elastic member 53 is in a compressed state. Along the flow direction of the fluid, the first blocking ball 52 is located downstream of the first through hole 14, so that the first through hole 14 communicates with the second through hole.

[0041] Specifically, after the first slide bar 20 is connected to the driving mechanism, the driving mechanism supplies liquid, and the liquid enters the first slide bar 20 from the driving mechanism. If the liquid pressure is less than or equal to the elastic force of the first elastic member 53, the liquid flowing through the first valve core 51 cannot push the first plugging ball 52 to move. At this time, the first plugging ball 52 blocks the flow path between the second through hole and the first through hole 14, and the liquid enters the second slide bar 30 through the gap 12 between the first valve body 11 and the connecting pipe 10. If the liquid pressure is less than the working pressure of the second pressure valve 60 at this time, the second pressure valve 60 does not act, and the second slide bar 30 is communicated with the drill bit 40, and drilling operations can be performed; if the liquid pressure is greater than the working pressure of the second pressure valve 60 at this time, the second pressure valve 60 acts to cut off the communication between the second slide bar 30 and the drill bit 40.

[0042] If the liquid pressure is greater than the elastic force of the first elastic member 53, the second pressure valve 60 acts, and the second pressure valve 60 cuts off the communication between the second slide bar 30 and the drill bit 40. The liquid flowing through the first valve core 51 pushes the first plugging ball 52 to compress the first elastic member 53, so that the first elastic member 53 is in a compressed state. At this time, along the flow direction of the liquid, the first plugging ball 52 is located downstream of the first through hole 14, and the second through hole is communicated with the first through hole 14, and the high-pressure liquid is ejected from the first through hole 14, and the area opposite to the connecting pipe 10 can be fractured.

[0043] As Figure 3 shown, in the embodiment of the present invention, a first stepped hole is provided in the drill bit 40. The first stepped hole includes a connected first large hole 41 and a first small hole 42. The first large hole 41 is adjacent to the second slide bar 30, and the second pressure valve 60 is disposed in the first large hole 41. The second pressure valve 60 is used to control the communication or closing of the second slide bar 30 and the first small hole 42.

[0044] Specifically, the second pressure valve 60 is disposed in the first large hole 41. The second pressure valve 60 is used to control the communication or disconnection of the second slide bar 30 and the first small hole 42. When the second slide bar 30 is communicated with the first small hole 42, the liquid enters the first small hole 42, and the drill bit 40 can perform drilling operations.

[0045] Further, as Figure 3As shown, in an embodiment of the present invention, the second pressure valve 60 includes: a second valve body 61, a second valve core 62, a second plugging ball 63, and a second elastic member 64. The second valve body 61 is disposed in the first large hole 41. A first tapered hole is provided in the second valve body 61. The large hole end of the first tapered hole faces the second slide rod 30, and the small hole end of the first tapered hole communicates with the first small hole 42. The second valve core 62 is provided with a third through hole, and the third through hole communicates with the second slide rod 30. The second valve core 62 is disposed at the large hole end of the first tapered hole. The second elastic member 64 is disposed at the small hole end of the first tapered hole. The second plugging ball 63 is disposed between the second valve core 62 and the second elastic member 64. Wherein, when the liquid pressure is less than or equal to the elastic force of the second elastic member 64, the second elastic member 64 is in an extended state, there is a gap between the second plugging ball 63 and the inner wall of the first tapered hole, and the second slide rod 30 communicates with the first small hole 42. When the liquid pressure is greater than the elastic force of the second elastic member 64, the second elastic member 64 is in a compressed state, the second plugging ball 63 abuts against the inner wall of the first tapered hole, and the second slide rod 30 is shut off from communicating with the first small hole 42.

[0046] Specifically, the liquid enters the first slide rod 20, the connecting pipe 10, and the second slide rod 30 from the driving mechanism. When the liquid pressure is less than or equal to the elastic force of the second elastic member 64, the liquid enters the first tapered hole through the third through hole of the second valve core 62. At this time, the liquid is not sufficient to push the second plugging ball 63 to move towards the small hole end of the first tapered hole. There is a gap between the second plugging ball 63 and the inner wall of the first tapered hole, and the liquid enters the first small hole 42 of the drill bit 40 through this gap, enabling the drill bit to perform drilling operations.

[0047] When the liquid pressure is greater than the elastic force of the second elastic member 64, the liquid enters the first tapered hole through the third through hole of the second valve core 62. At this time, the liquid pushes the second plugging ball 63 to move towards the direction close to the small hole end of the first tapered hole, thereby compressing the second elastic member 64. The second plugging ball 63 abuts against the inner wall of the second tapered hole, preventing the liquid from entering the first small hole 42, and thus stopping the drilling operation.

[0048] As Figure 1 shown, in an embodiment of the present invention, the hydraulic fracturing device further includes: a first expansion tube 71 and a first connection assembly. The first expansion tube 71 is sleeved outside the first slide rod 20. A fifth through hole 21 is provided on the wall surface of the first slide rod 20, and the fifth through hole 21 communicates with the first expansion tube 71. The first connection assembly is used to connect both ends of the first expansion tube 71 to the first slide rod 20, and the first connection assembly is also used to be detachably connected to the driving mechanism.

[0049] Specifically, when the liquid pressure is greater than the operating pressure of the second pressure valve 60, the second pressure valve 60 shuts off the connection between the second slide bar 30 and the drill bit 40. At this time, the liquid in the first slide bar 20 enters the first expansion tube 71 through the fifth through hole 21, causing the first expansion tube 71 to expand.

[0050] Correspondingly, the hydraulic fracturing device further includes: a second expansion tube 72 and a second connection assembly. The second expansion tube 72 is sleeved outside the second slide bar 30. A sixth through hole 31 is provided on the wall surface of the second slide bar 30, and the sixth through hole 31 communicates with the second expansion tube 72. The second connection assembly is used to connect both ends of the second expansion tube 72 to the second slide bar 30.

[0051] Specifically, when the liquid pressure is greater than the operating pressure of the second pressure valve 60, the second pressure valve 60 shuts off the connection between the second slide bar 30 and the drill bit 40. At this time, the liquid in the second slide bar 30 enters the second expansion tube 72 through the sixth through hole 31, causing the second expansion tube 72 to expand.

[0052] Further, after the first expansion tube 71 and the second expansion tube 72 expand, continuously increase the liquid pressure so that the liquid pressure is greater than the operating pressure of the first pressure valve 50. At this time, the second through hole of the first valve core 51 communicates with the first through hole 14 of the connecting pipe 10, and the high-pressure liquid jets out from the first through hole 14, so that the area between the first expansion tube 71 and the second expansion tube 72 can be fractured.

[0053] Further, as Figure 1 shown, in the embodiment of the present invention, the first connection assembly includes: a first connecting member 80, a first pipe clamp 90, and a second connecting member 100. The first connecting member 80 is sleeved outside the first slide bar 20. A first plugging portion 82 is provided at the first end of the first connecting member 80, and the first plugging portion 82 is inserted into the first end of the first expansion tube 71. The second end of the first connecting member 80 is used for detachable connection with the driving mechanism. The first pipe clamp 90 is sleeved outside the first end of the first expansion tube 71 and is opposite to the position of the first plugging portion 82. The first end of the second connecting member 100 is sleeved outside the second end of the first expansion tube 71, and the second end of the second connecting member 100 is sleeved outside the first slide bar 20 and is hermetically connected to the first slide bar 20.

[0054] Specifically, as Figure 4As shown, a protrusion 81 is provided in the middle of the first connecting member 80. The diameters of both ends of the first connecting member 80 are smaller than the diameter of the protrusion 81. A first insertion portion 82 is provided at the first end of the first connecting member 80. In this embodiment, the first insertion portion 82 is a plurality of convex blocks, and a slope is provided on the surface of each convex block facing away from the first sliding rod 20. The distance between the surface of the slope close to the first end of the first connecting member 80 and the first sliding rod 20 is greater than the distance between the surface of the slope close to the second end of the first connecting member 80 and the first sliding rod 20. After the liquid enters the first expansion tube 71 through the fifth through hole 21 on the first sliding rod 20 and flows in the direction close to the first connecting member 80, the slope can increase the flow resistance of the liquid, thereby preventing the liquid from flowing out through the gap between the first insertion portion 82 and the first expansion tube 71. The second end of the first connecting member 80 is provided with an external thread, which can be detachably connected to the driving mechanism. A third stepped hole is provided in the second connecting member 100. The third stepped hole includes a connected third large hole and a third small hole. The second end of the first expansion tube 71 is inserted into the third large hole, and the end surface of the second end of the first expansion tube 71 abuts against the bottom of the third large hole. The first sliding rod 20 passes through the third small hole to achieve the sealing of the second end of the first expansion tube 71.

[0055] As Figure 1 shown, in the embodiment of the present invention, the second connection assembly includes: a third connecting member 110, a second pipe clamp 120, and a fourth connecting member 130. The third connecting member 110 is sleeved outside the second sliding rod 30. The first end of the third connecting member 110 is connected to the second end of the connecting pipe 10. A second insertion portion is provided at the second end of the third connecting member 110, and the second insertion portion is inserted into the first end of the second expansion tube 72. The second pipe clamp 120 is sleeved outside the first end of the second expansion tube 72 and is opposite to the second insertion portion in position. The first end of the fourth connecting member 130 is sleeved outside the second end of the second expansion tube 72, and the second end of the fourth connecting member 130 is sleeved outside the second sliding rod 30 and is hermetically connected to the second sliding rod 30.

[0056] Specifically, the second end of the connecting pipe 10 is provided with an internal thread, and the first end of the third connecting member 110 is provided with an external thread. The first end of the third connecting member 110 is threadedly connected to the second end of the connecting pipe 10. A second insertion portion is provided at the second end of the third connecting member 110. In this embodiment, the structure of the third connecting member 110 is exactly the same as the structure of the first connecting member 80, and the principle of preventing the liquid in the second expansion tube 72 from leaking out is also the same as that of the first connecting member 80, so it will not be elaborated here.

[0057] As Figure 1As shown, in an embodiment of the present invention, the hydraulic fracturing device further includes a fifth connecting member 140. The fifth connecting member 140 includes a first connecting portion and a second connecting portion connected in sequence. The outer diameter of the first connecting portion is smaller than that of the second connecting portion. The first end of the connecting pipe 10 is provided with an internal thread, and the first connecting portion is provided with an external thread. The first connecting portion is threadedly connected to the first end of the connecting pipe 10. The end face of the first end of the connecting pipe 10 abuts against the side face of the second connecting portion to prevent the liquid in the connecting pipe 10 from leaking out.

[0058] In an embodiment of the present invention, the hydraulic fracturing device further includes a cutting mechanism 200. The first end of the cutting mechanism 200 is detachably connected to the second end of the first sliding rod 20, and the second end of the cutting mechanism 200 is used for detachably connecting to the driving mechanism.

[0059] Specifically, the cutting mechanism 200 can be connected to the second end of the first sliding rod 20, and then the cutting mechanism 200 is connected to the driving mechanism. The driving mechanism acts to provide liquid, and after the liquid flows through the cutting mechanism 200, the cutting operation can be realized.

[0060] Further, after a first expansion tube 71 is sleeved outside the first sliding rod 20, the cutting mechanism 200 can also be threadedly connected to the second end of the first connecting member 80.

[0061] Further, as Figure 5 As shown, in an embodiment of the present invention, the cutting mechanism includes: a first cylinder body 210, a second cylinder body 220, and a third pressure valve 230. A second stepped hole is provided in the first cylinder body 210. The second stepped hole includes a connected second large hole 211 and a second small hole 212. The first sliding rod 20 is detachably connected to the first cylinder body 210 through the second small hole 212. A plurality of fourth through holes 201 are provided on the wall surface of the first cylinder body 210. The second cylinder body 220 is hermetically connected to the first cylinder body 210. The second cylinder body 220 is used for detachably connecting to the driving mechanism. The third pressure valve 230 is arranged in the first cylinder body 210 and the second cylinder body 220. The third pressure valve 230 is used to control the communication or disconnection between the fourth through holes 201 and the second cylinder body 220. Among them, in the case of drilling or fracturing operations, the fourth through holes 201 are disconnected from the second cylinder body 220, and in the case of cutting operations, the fourth through holes 201 are connected to the second cylinder body 220.

[0062] Specifically, after connecting the driving mechanism to the cutting mechanism 200, the driving mechanism operates to supply liquid to the cutting mechanism 200. The liquid enters the second cylinder 220 from the driving mechanism. In the case of drilling or fracturing operations, the third pressure valve 230 does not operate. After the liquid flows through the third pressure valve 230, it enters the first cylinder 210, and then sequentially enters the first sliding rod 20, the connecting pipe 10, the second sliding rod 30, and the drill bit 40 to achieve drilling operations, or sequentially enters the first sliding rod 20, the connecting pipe 10, and the second sliding rod 30 to achieve fracturing operations.

[0063] In the case of cutting operations, the third pressure valve 230 operates to cut off the connection between the second cylinder 220 and the first cylinder 210. The fourth through hole 201 on the second cylinder 220 and the first cylinder 210 is connected, and the liquid jets out from the fourth through hole 201, thereby performing cutting operations.

[0064] Further, as Figure 6 shown, in the embodiment of the present invention, the third pressure valve 230 includes: a third elastic member 231, a third plugging ball 232, and a third valve core 233. The third elastic member 231 is disposed in the second large hole 211. The third valve core 233 is provided with a second tapered hole, and the second tapered hole communicates with the second cylinder 220. The large hole end of the second tapered hole faces the second cylinder 220, and the outer wall of the third valve core 233 abuts against the inner wall of the first cylinder 210. The third plugging ball 232 can be disposed at the large hole end of the second tapered hole.

[0065] Among them, in the case of drilling or fracturing operations, the third plugging ball 232 is located outside the hydraulic fracturing device, the third elastic member 231 is in an extended state, the third valve core 233 plugs the fourth through hole 201, and the second cylinder 220, the second tapered member, and the first cylinder 210 are connected; in the case of cutting operations, the third plugging ball 232 is disposed at the large hole end of the second tapered hole, and the third plugging ball 232 abuts against the inner wall of the second tapered hole to cut off the connection between the second cylinder 220 and the first cylinder 210. The third elastic member 231 is in a compressed state. Along the flow direction of the liquid, the third valve core 233 is located downstream of the fourth through hole 201, and the fourth through hole 201 communicates with the second cylinder 220.

[0066] Specifically, when the hydraulic fracturing device performs drilling or fracturing operations, the third plugging ball 232 is removed from the second tapered hole. At this time, the second cylinder body 220 communicates with the first cylinder body 210 through the second tapered hole, and the liquid provided by the driving mechanism can enter the first sliding rod 20, the connecting pipe 10, and the second sliding rod 30 to achieve drilling or fracturing operations. When the hydraulic fracturing device performs cutting operations, the third plugging ball 232 is placed at the large-hole end of the second tapered hole. When the liquid pressure is greater than the elastic force of the third elastic member 231, the liquid pushes the third plugging ball 232 to fit against the wall surface of the second tapered hole, and then pushes the third plugging ball 232 and the third valve core 233 to move together in the direction close to the first cylinder body 210, thereby compressing the third elastic member 231. At this time, along the flow direction of the liquid, the fourth through hole 201 is located upstream of the third valve core 233, and the liquid entering the second cylinder body 220 is ejected from the fourth through hole 201, and the high-pressure liquid performs jet cutting on the surrounding rock. After the cutting operation is completed, the driving mechanism stops supplying liquid, the driving mechanism is removed, and the third plugging ball 232 can directly slide outside the second cylinder body 220 under the action of gravity.

[0067] The hydraulic fracturing device provided by the embodiment of the present invention only needs to use this device to perform drilling, fracturing, and cutting operations, realizing the integrated operation of the hydraulic fracturing device, reducing the labor intensity of operators, and improving the operation efficiency.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydraulic fracturing device, characterized in that, Comprising: A connecting pipe, both ends of the connecting pipe are communicated, a first valve body is arranged inside the connecting pipe, one outer wall of the first valve body is coplanar with the inner wall of the connecting pipe, there is a gap between the remaining outer walls of the first valve body and the inner wall of the connecting pipe, a blind hole is arranged inside the first valve body, a first through hole is arranged on the wall surface of the connecting pipe connected to the first valve body, and a first pressure valve is arranged inside the blind hole, and the first pressure valve is used to control the communication or disconnection between the first through hole and the first end of the connecting pipe; A first sliding rod, the first sliding rod is communicated with the first end of the connecting pipe; A second sliding rod, the first end of the second sliding rod is communicated with the second end of the connecting pipe; A drill bit, connected to the second end of the second sliding rod, and a second pressure valve is arranged inside the drill bit, and the second pressure valve is used to control the communication or disconnection between the drill bit and the second sliding rod; When the liquid pressure is less than or equal to the working pressure of the second pressure valve, the first sliding rod, the connecting pipe, the second sliding rod and the drill bit are communicated, so that the drill bit performs drilling operations; When the liquid pressure is greater than the working pressure of the first pressure valve, the first sliding rod, the connecting pipe and the second sliding rod are communicated, the connecting pipe is communicated with the first through hole, and the second sliding rod is disconnected from the drill bit, so that the connecting pipe performs fracturing operations, wherein the working pressure of the first pressure valve is greater than the working pressure of the second pressure valve; A cutting mechanism, the first end of the cutting mechanism is detachably connected to the first sliding rod, and the second end of the cutting mechanism is used to be detachably connected to a driving mechanism; The cutting mechanism includes: A first cylinder body, a second stepped hole is arranged inside the first cylinder body, the second stepped hole includes a connected second large hole and a second small hole, the first sliding rod is detachably connected to the first cylinder body through the second small hole, and a plurality of fourth through holes are arranged on the wall surface of the first cylinder body; A second cylinder body, hermetically connected to the first cylinder body, and the second cylinder body is used to be detachably connected to the driving mechanism; A third pressure valve, arranged inside the first cylinder body and the second cylinder body, and the third pressure valve is used to control the communication or disconnection between the fourth through hole and the second cylinder body; Wherein, in the case of drilling or fracturing operations, the fourth through hole is disconnected from the second cylinder body, and in the case of cutting operations, the fourth through hole is communicated with the second cylinder body.

2. The hydraulic fracturing device according to claim 1, characterized in that, The first pressure valve includes: a first valve core, a first plugging ball and a first elastic member arranged inside the blind hole, the first elastic member abuts against the bottom of the blind hole, the first plugging ball is located between the first valve core and the first elastic member, and the first valve core is provided with a second through hole, and the second through hole is communicated with the connecting pipe; Wherein, when the liquid pressure is less than or equal to the elastic force of the first elastic member, the first elastic member is in an extended state, along the flow direction of the liquid, the first plugging ball is located upstream of the first through hole, so that the first through hole is disconnected from the second through hole; When the liquid pressure is greater than the elastic force of the first elastic member, the first elastic member is in a compressed state. Along the liquid flow direction, the first plugging ball is located downstream of the first through hole, so that the first through hole communicates with the second through hole.

3. The hydraulic fracturing device according to claim 1, characterized in that A first stepped hole is provided in the drill bit. The first stepped hole includes a connected first large hole and a first small hole. The first large hole is adjacent to the second sliding rod. The second pressure valve is arranged in the first large hole, and the second pressure valve is used to control the communication or disconnection between the second sliding rod and the first small hole.

4. The hydraulic fracturing device according to claim 3, wherein The second pressure valve includes: A second valve body arranged in the first large hole. A first tapered hole is provided in the second valve body. The large hole end of the first tapered hole faces the second sliding rod, and the small hole end of the first tapered hole communicates with the first small hole. A second valve core, a second plugging ball and a second elastic member. The second valve core is provided with a third through hole which communicates with the second sliding rod. The second valve core is arranged at the large hole end of the first tapered hole. The second elastic member is arranged at the small hole end of the first tapered hole. The second plugging ball is arranged between the second valve core and the second elastic member. Wherein, when the liquid pressure is less than or equal to the elastic force of the second elastic member, the second elastic member is in an extended state. There is a gap between the second plugging ball and the inner wall of the first tapered hole, and the second sliding rod communicates with the first small hole. When the liquid pressure is greater than the elastic force of the second elastic member, the second elastic member is in a compressed state. The second plugging ball abuts against the inner wall of the first tapered hole, and the communication between the second sliding rod and the first small hole is cut off.

5. The hydraulic fracturing device according to claim 1, characterized in that, The third pressure valve includes: A third elastic member arranged in the second large hole; A third valve core provided with a second tapered hole which communicates with the second cylinder body. The large hole end of the second tapered hole faces the second cylinder body. The outer wall of the third valve core abuts against the inner wall of the first cylinder body. A third plugging ball which can be arranged at the large hole end of the second tapered hole; Wherein, when drilling or fracturing operations are carried out, the third plugging ball is located outside the hydraulic fracturing device. The third elastic member is in an extended state. The third valve core plugs the fourth through hole, and the second cylinder body, the second tapered hole and the first cylinder body communicate with each other. When cutting operations are carried out, the third plugging ball is arranged at the large hole end of the second tapered hole. The third plugging ball abuts against the inner wall of the second tapered hole to cut off the communication between the second cylinder body and the first cylinder body. The third elastic member is in a compressed state. Along the liquid flow direction, the third valve core is located downstream of the fourth through hole, and the fourth through hole communicates with the second cylinder body.

6. The hydraulic fracturing device according to claim 1, wherein, It further includes: A first expansion tube sleeved outside the first sliding rod. A fifth through hole is provided on the wall surface of the first sliding rod, and the fifth through hole communicates with the first expansion tube. A first connection assembly for connecting both ends of the first expansion tube to the first sliding rod. The first connection assembly is also used for detachably connecting to the driving mechanism.

7. The hydraulic fracturing device according to claim 6, wherein, The first connection component includes: A first connecting member sleeved outside the first sliding rod. A first end of the first connecting member is provided with a first insertion portion which is inserted into the first end of the first expansion tube. A second end of the first connecting member is for detachably connecting with the driving mechanism. A first pipe clamp sleeved outside the first end of the first expansion tube and opposite to the position of the first insertion portion. A second connecting member. A first end of the second connecting member is sleeved outside the second end of the first expansion tube. A second end of the second connecting member is sleeved outside the first sliding rod and is hermetically connected with the first sliding rod.

8. The hydraulic fracturing device according to claim 7, characterized in that, The first insertion portion includes a plurality of bumps. Each bump is provided with an inclined surface on a surface facing away from the first sliding rod. A distance between the inclined surface and the first sliding rod at a surface close to the first end of the first connecting member is greater than a distance between the inclined surface and the first sliding rod at a surface close to the second end of the first connecting member.

9. The hydraulic fracturing device according to claim 1, wherein, It further includes: A second expansion tube sleeved outside the second sliding rod. The wall surface of the second sliding rod is provided with a sixth through hole which is communicated with the second expansion tube. A second connection component for connecting two ends of the second expansion tube with the second sliding rod.

10. The hydraulic fracturing device according to claim 9, characterized in that, The second connection component includes: A third connecting member sleeved outside the second sliding rod. A first end of the third connecting member is connected with the second end of the connecting pipe. A second end of the third connecting member is provided with a second insertion portion which is inserted into the first end of the second expansion tube. A second pipe clamp sleeved outside the first end of the second expansion tube and opposite to the position of the second insertion portion. A fourth connecting member. A first end of the fourth connecting member is sleeved outside the second end of the second expansion tube. A second end of the fourth connecting member is sleeved outside the second sliding rod and is hermetically connected with the second sliding rod.

11. The hydraulic fracturing device according to claim 1, characterized in that, It further includes a fifth connecting member which includes a first connecting portion and a second connecting portion connected in sequence. An outer diameter of the first connecting portion is smaller than an outer diameter of the second connecting portion. The first connecting portion is connected with the first end of the connecting pipe. An end surface of the first end of the connecting pipe abuts against a side surface of the second connecting portion.

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