A device for preventing the rod string of the water injection rod from sticking during hydraulic fracturing

Abstract

The present invention discloses a hydraulic fracturing device for preventing the injection rod from stringing out, which includes: a thick-walled through pipe, on which there is an injection water through hole for inserting an injection rod in the injection fracturing process. An injection rod positioning mechanism for restricting the injection rod is arranged on the injection water through hole to control the fixed angle and height of the injection rod and eliminate the vibration of the fixed injection rod. Upper and lower sleeves are respectively arranged at both ends of the thick-walled through pipe. A top column is arranged at one end of the upper sleeve away from the thick-walled through pipe, and a lifting mechanism for controlling the height adjustment of the thick-walled through pipe is fixedly arranged at one end of the lower sleeve away from the thick-walled through pipe. The present invention can move freely at the underground construction site and adjust the height of the lifting mechanism according to the height of the drill hole, so as to adapt to drill holes of different heights underground. At the same time, the injection rod positioning mechanism can effectively clamp the position of the injection rod, so that the injection rod will not quickly string out with the water flow during the pressure relief process, reducing the risk of safety accidents.

Description

Technical Field

[0001] The present invention relates to the technical field of roof treatment in coal mine roadways, and particularly to a hydraulic fracturing device for preventing the injection rod from stringing out. Background Art

[0002] During the hydraulic fracturing construction of hard roofs in coal mines, first, boreholes at various angles need to be constructed in the working face and gateways. Secondly, the injection rods and packers for fracturing need to be pushed into the designated positions of the boreholes for fracturing operations. After each fracturing operation, the packer needs to be depressurized. During the depressurization process, affected by the relatively high strength of coal and rock, the fractures generated by fracturing will quickly close, and the water in the fractures will return along the borehole, causing the packer and injection rod to string out downward.

[0003] Currently, hydraulic fracturing technology has been widely applied in the control of hard and difficult-to-collapse roofs and the prevention of rock bursts in coal mines. However, during the fracturing operation, high-pressure fluid is injected into the fractures of the hard roof under the action of the pump station pressure, and the fractures are fully extended. When the fracturing stops, the fractures quickly close, causing the high-pressure fluid to flow back to the borehole. During the depressurization process, affected by the backwater force of the borehole, the injection rod is likely to string out quickly, posing risks of damage to the injection rod and injury to people. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to some extent.

[0005] To achieve the above object, the present invention provides a hydraulic fracturing device for preventing the injection rod from stringing out, including: a thick-walled through pipe, on which there is an injection through hole for inserting an injection rod in the injection fracturing process. An injection rod positioning mechanism for restricting the injection rod is arranged on the injection through hole to control the fixed angle and height of the injection rod. And the injection rod positioning mechanism is connected to a hydraulic system to eliminate the vibration on the injection rod and finely adjust the fixed angle and height of the injection rod. Upper and lower sleeves are respectively arranged at both ends of the thick-walled through pipe. A top column is arranged at one end of the upper sleeve away from the thick-walled through pipe, and a lifting mechanism for controlling the height adjustment of the thick-walled through pipe is fixedly arranged at one end of the lower sleeve away from the thick-walled through pipe.

[0006] The present invention can move freely at the underground construction site and adjust the height of the lifting mechanism according to the height of the borehole, so as to adapt to boreholes of different heights underground. At the same time, the injection rod positioning mechanism can effectively clamp the position of the injection rod, so that the injection rod will not quickly string out with the water flow during the depressurization process, reducing the risk of safety accidents.

[0007] Optionally, the injection through hole is arranged as a rectangular through hole along the length direction of the thick-walled through pipe, providing a space for the injection rod to move in the injection through hole according to the height and angle of the borehole.

[0008] Furthermore, the water injection rod positioning mechanism includes two fixed plates fixedly arranged on the thick-walled through-tube at the two ends of the corresponding water injection through-holes, and the fixed plates are each provided with a movable clearance groove to cooperate with the water injection through-holes, and the fixed plates are provided with a plurality of positioning pin holes along the direction perpendicular to the length of the movable clearance groove, and the positioning pin holes are provided with water injection rod positioning pins.

[0009] Furthermore, a height difference is provided between the two fixing plates in a height direction.

[0010] Furthermore, there are multiple water injection rod locating pins, which can be divided into two groups and inserted into the locating pin holes on the two fixed plates. Any water injection rod locating pin on the fixed plate on the same side is inserted into the adjacent locating pin holes, and the water injection rods are all set through the gaps between the water injection rod locating pins in the two groups of water injection rod locating pin groups to clamp the water injection rods.

[0011] Furthermore, vibration filter tracks are provided at the positions corresponding to the two fixed plates on the thick-walled through-tubes, the fixed plates are slidingly connected to the vibration filter tracks, a vibration filter oil bag is provided in the vibration filter track, and the vibration filter oil bag is connected to the hydraulic system oil circuit.

[0012] Furthermore, the water injection rod positioning mechanism includes two groups of hydraulic cylinders arranged on both sides of the water injection perforation channel, and the two groups of hydraulic cylinders are respectively fixedly arranged on one end of the thick-walled perforation pipe close to the upper casing and one end close to the lower casing, and the telescopic ends of the two groups of hydraulic cylinders are both arranged toward the direction of the water injection perforation, and the telescopic ends of the hydraulic cylinders are detachably fixedly connected to the water injection rod.

[0013] Furthermore, a universal joint is provided at the telescopic end of the hydraulic cylinder, and the universal joint is fixedly connected to a water injection rod fastening ring, and the water injection rod fastening ring is used for detachable and fixed connection with the water injection rod.

[0014] Furthermore, the water injection rod can be adjusted to an angle range of less than or equal to 70° under the action of the universal joint.

[0015] Furthermore, the water injection rod passes through the water injection through-hole and is sleeved with a fixing three-ring at a position close to the fixing plate toward the drilling section.

[0016] Furthermore, the lifting mechanism includes a retractable hydraulic cylinder provided at one end of the lower casing away from the thick-walled through-tube, and the retractable hydraulic cylinder is provided with a hydraulic single support at one end away from the lower casing.

[0017] Furthermore, the lower casing is fixedly connected to the telescopic end of the telescopic hydraulic cylinder via a flange, and a monomer injection hole is provided on the side surface of the hydraulic monomer support.

[0018] Further, a serrated surface is provided at one end of the top column away from the upper sleeve.

[0019] Further, the upper sleeve, the thick-walled through pipe, and the lower sleeve are detachably arranged.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Description of the Drawings

[0021] The above-mentioned and / or additional aspects and advantages of the present invention will become apparent and easy to understand from the following description of the embodiments in conjunction with the drawings, where:

[0022] Figure 1 is a front view of the overall structure of Embodiment 1 of a hydraulic fracturing prevention water injection rod string rod device of the present invention;

[0023] Figure 2 is a side view of the overall structure of Embodiment 1 of a hydraulic fracturing prevention water injection rod string rod device of the present invention;

[0024] Figure 3 is a front view of the overall structure of Embodiment 2 of a hydraulic fracturing prevention water injection rod string rod device of the present invention;

[0025] Figure 4 is a side view of the overall structure of Embodiment 2 of a hydraulic fracturing prevention water injection rod string rod device of the present invention;

[0026] Figure 5 is a partial structure schematic diagram of the universal joint of Embodiment 2 of a hydraulic fracturing prevention water injection rod string rod device of the present invention.

[0027] Description of the Reference Numerals:

[0028] 1, serrated top column; 2, upper sleeve; 3, thick-walled through pipe; 4, water injection rod positioning pin; 5, water injection through hole; 6, lower sleeve; 7, flange; 8, telescopic hydraulic cylinder; 9, single-body liquid injection hole; 10, hydraulic single-body support column; 11, water injection rod; 12, fixed triple ring; 13, water injection rod positioning pin; 14, water injection rod positioning hole; 15, drilling hole; 16, water injection rod fastening ring; 17, hydraulic cylinder. Detailed Description of the Embodiments

[0029] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0030] Embodiment 1:

[0031] The present invention provides a device for preventing the stringing of injection rods in hydraulic fracturing, which will be elaborated in detail below with reference to Figures 1 to 2 this.

[0032] A device for preventing the stringing of injection rods in hydraulic fracturing includes: a thick-walled through pipe 3, on which there is an injection through hole 5 for inserting an injection rod 11 in the injection fracturing process. An injection rod positioning mechanism for restricting the injection rod 11 is arranged on the injection through hole 5. Upper and lower sleeves 2 and 6 are respectively arranged at both ends of the thick-walled through pipe 3. A jack column is arranged at one end of the upper sleeve 2 away from the thick-walled through pipe 3, and a serrated surface is arranged at one end of the jack column away from the upper sleeve 2 for tightly pressing against the roof of the roadway. A lifting mechanism for controlling the height adjustment of the thick-walled through pipe 3 is fixedly arranged at one end of the lower sleeve 6 away from the thick-walled through pipe 3.

[0033] The injection rod positioning mechanism is used to control the fixed angle and height of the injection rod 11, and the injection rod positioning mechanism is connected to a hydraulic system to eliminate the vibration on the injection rod 11 and finely adjust the fixed angle and height of the injection rod 11.

[0034] The present invention can move freely at the underground construction site. And in some embodiments, for the convenience of movement, a moving platform for movement is arranged at the bottom end of the lifting mechanism, and a moving component for movement is arranged under the moving platform, which can be a pulley, a sliding shoe, etc.; and the height of the lifting mechanism is adjusted according to the height of the drill hole 15, so as to adapt to drill holes 15 of different heights underground. At the same time, the injection rod positioning mechanism can effectively clamp the position of the injection rod 11, so that the injection rod 11 will not quickly string out along with the water flow during the pressure relief process, reducing the risk of safety accidents. At the same time, the injection rod positioning mechanism controlled by oil pressure can adjust the angle and height of the injection rod 11 at the same time, and filter and absorb the vibration generated by the injection rod 11 itself during injection pressure relief, preventing the vibration from being transmitted to the thick-walled through pipe 3 and having a long-term vibration impact on the thick-walled through pipe 3 and other components connected thereto, thereby avoiding the reduction of the service life of each component due to long-term vibration, and avoiding the occurrence of safety accidents caused by the operator accidentally touching the injection rod 11 during injection pressure relief.

[0035] Considering that the height and angle of the drill hole 15 during injection fracturing will be different in specific construction, it is necessary to consider adjusting the height and angle of the injection rod 11 according to the drill hole 15 while clamping the injection rod 11. Therefore, the injection through hole 5 is arranged as a rectangular through hole along the length direction of the thick-walled through pipe 3 to provide a space for the injection rod 11 to move in the injection through hole 5 according to the height and angle of the drill hole 15.

[0036] Considering that after the water injection and fracturing operation is completed, the backflow of water will cause the water injection rod 11 to be pulled out, which will cause a safety hazard, the water injection rod 11 needs to be clamped to prevent the water injection rod 11 from being pulled out and causing injuries to the workers. Therefore, the water injection rod 11 positioning mechanism includes two fixed plates fixedly set on the thick-walled through-tube 3 at the two ends of the water injection through-hole 5. The fixed plates are both provided with movable clearance grooves to match the water injection through-hole 5, and a plurality of water injection rod positioning holes 14 are provided on the fixed plates perpendicular to the length direction of the movable clearance grooves. The water injection rod positioning holes 14 are penetrated by water injection rod positioning pins 13.

[0037] Furthermore, a plurality of water injection rod locating pins 13 are provided, and can be evenly divided into two groups and inserted into the water injection rod locating holes 14 on the two fixed plates. Any water injection rod locating pin 13 on the fixed plate on the same side is inserted into the adjacent water injection rod locating hole 14, and the water injection rod 11 is arranged through the gap between the water injection rod locating pins 13 in the two groups of water injection rod locating pins 13 to clamp the water injection rod 11. Furthermore, in order to strengthen the clamping of the water injection rod 11, a fixing three-ring 12 is sleeved on the water injection rod 11 passing through the water injection through-hole 5 and facing the drill hole 15 near the position of the fixed plate. After one end of the water injection rod 11 passes through the water injection through-hole 5, it is fixed to the water injection rod 11 through the fixing three-ring 12 and the fixing three-ring 12 is positioned on the water injection rod 11 near the water injection through-hole 5. The three fixing rings include three earrings that are rotationally symmetrical along the axis of the water injection rod. Under some working conditions, the three earrings can be connected to auxiliary fixing ropes for further auxiliary fixation.

[0038] Furthermore, it is considered that during the water injection pressure relief process, due to the impact of water flow and entrained crushed coal bodies on the water injection rod 11, the water injection rod 11 will generate vibrations with a relatively high frequency. After the vibrations are transmitted along the water injection rod 11 to the thick-wall through pipe 3, long-term vibration effects will be imposed on the thick-wall through pipe 3 and each component connected thereto, including the fixed three-ring 12, which may cause problems such as loosening of the fixed structure. Therefore, vibration filtering tracks are provided at positions corresponding to the two fixing plates on the thick-wall through pipe 3. The fixing plates are slidably connected to the vibration filtering tracks. Vibration filtering oil bags are arranged inside the vibration filtering tracks, and vibration filtering oil bags are provided at both ends of the vibration filtering tracks. One end of the vibration filtering oil bag abuts against the end of the vibration filtering track, and the other end abuts against the end wall of the fixing plate. The vibration filtering oil bag is connected to the hydraulic system oil circuit. After the water injection rod 11 is fixed, the hydraulic system is controlled to supply oil to the vibration filtering oil bag, causing the fixing plate to move along the vibration filtering track. When both vibration filtering oil bags in a single vibration filtering track are supplied with oil until they abut against the fixing plate and keep the fixing plate stable and immovable, the water injection pressure fracturing operation and the pressure relief operation can be carried out. When the water flow and crushed coal bodies impact the water injection rod 11, the vibrations are transmitted along the water injection rod 11 to the position of the vibration filtering oil bag, and the vibrations will be absorbed by the vibration filtering oil bag. After the kinetic energy is transmitted to the vibration filtering oil bag, the oil bodies inside the vibration filtering oil bag will generate friction with each other and with the inner wall of the vibration filtering oil bag, converting the mechanical energy of the vibration into heat energy, thereby dissipating the vibrations. At the same time, in some embodiments, each vibration filtering oil bag is individually connected to the hydraulic system oil circuit, and each oil circuit is individually controlled. The staff can control the amount of oil supplied to the vibration filtering oil bag by controlling the oil circuit corresponding to each vibration filtering oil bag, thereby achieving fine adjustment of the height of the fixing plate, that is, fine adjustment of the height of the water injection rod 11 can be realized. In some embodiments, the vibration filtering oil bag can be replaced by a small hydraulic cylinder, so that the hydraulic cylinder controls the up and down movement of the fixing frame. In other embodiments, the vibration filtering oil bag can be replaced by an air bag or a cylinder, and an external air supply system is connected, so that the air bag or the cylinder can achieve the technical effects of fixing the fixing plate, buffering vibration filtering, and fine position adjustment of the vibration filtering oil bag in this embodiment.

[0039] To achieve height adjustment, the lifting mechanism includes a telescopic hydraulic cylinder 8 provided at one end of the lower casing 6 away from the thick-wall through pipe 3. A hydraulic single prop 10 is provided at the end of the telescopic hydraulic cylinder 8 away from the lower casing 6, and a single liquid injection hole 9 for supplying liquid to the hydraulic cylinder is provided on the hydraulic single prop 10.

[0040] Furthermore, considering that when a component such as the thick-walled through pipe 3, the upper casing 2, or the lower casing 6 is damaged, the damaged component can be replaced separately. Therefore, the upper casing 2, the thick-walled through pipe 3, and the lower casing 6 are detachably arranged. At the same time, the lower casing 6 and the telescopic end of the telescopic hydraulic cylinder 8 are fixedly connected through a flange 7. On the one hand, the staff can replace a single component when it is damaged to prevent material waste caused by the need to replace the entire device after a component is damaged. On the other hand, when the staff moves the entire device, they can disassemble each component into monomers and transport them through other transportation devices, which facilitates the movement of the device by the staff.

[0041] The working principle of the present invention is as follows: When performing a water injection fracturing operation is required, after the staff transports the entire device to the working location, the thick-walled through pipe 3, the upper casing 2, the lower casing 6, the serrated top column 1, and the lifting mechanism are spliced. After the splicing is completed, the height of the entire device is adjusted through the lifting mechanism, and the hydraulic system is controlled to supply oil to the vibration filtering oil bag. By controlling the oil circuit corresponding to each vibration filtering oil bag, the amount of oil supplied to the vibration filtering oil bag is controlled, so as to achieve fine adjustment of the height of the fixed plate, that is, fine adjustment of the height of the water injection rod 11 can be realized. The staff passes the water injection rod 11 through the water injection through hole 5 and then fixes the fixing ring 12 at one end of the water injection rod 11 facing the drilling hole 15. After the end of the water injection rod 11 facing the drilling hole 15 penetrates into the corresponding working position in the drilling hole 15, the staff fixes the fixing ring 12 at a position on the water injection rod 11 close to the water injection through hole 5, and inserts the water injection rod positioning pin 13 into the water injection rod positioning holes 14 corresponding to both sides of the water injection rod 11 on each fixed plate. This anti-stringing rod device can be erected close to the coal wall. Compared with the traditional hanging protection chain, the exposed length of the water injection rod 11 can be shortened, and the phenomenon of pressure relief and stringing rods can be eliminated. When the water flow and crushed coal body impact the water injection rod 11, the vibration is transmitted along the water injection rod 11 to the position of the vibration filtering oil bag. The vibration will be absorbed by the vibration filtering oil bag. After the kinetic energy is transmitted to the vibration filtering oil bag, the oil bodies in the vibration filtering oil bag and between the inner wall of the vibration filtering oil bag will generate friction, and the mechanical energy of the vibration will be converted into heat energy, thereby dissipating the vibration.

[0042] Embodiment 2:

[0043] Compared with the above Embodiment 1, except for the different structure of the water injection rod positioning mechanism, the rest of the structures and their functions are exactly the same. The following Figures 3 to 5 only describes and explains the water injection rod positioning mechanism.

[0044] The positioning mechanism of the water injection rod 11 includes two sets of hydraulic cylinders 17 respectively arranged on both sides of the channel of the through hole 5 of the water injection rod 11. The two sets of hydraulic cylinders 17 are respectively fixedly arranged at one end of the thick-wall through pipe 3 close to the upper casing 2 and at one end close to the lower casing 6, and the telescopic ends of the two sets of hydraulic cylinders 17 are all arranged towards the direction of the through hole 5 of the water injection rod 11. The telescopic end of the hydraulic cylinder 17 is detachably and fixedly connected to the water injection rod 11, that is, the two sets of hydraulic cylinders 17 are symmetrically arranged about the center on both sides of the channel of the through hole 5 of the water injection rod 11, and the cylinder bodies of the two sets of hydraulic cylinders 17 are arranged on the upper casing 2. A universal joint is arranged at the telescopic end of the hydraulic cylinder 17, and the universal joint is fixedly connected with a fastening ring of the water injection rod 11. The fastening ring is divided into a lower ring fixedly connected with the universal joint and a detachable upper ring, and the lower ring and the upper ring are detachably and fixedly connected by bolts and nuts. The fastening ring of the water injection rod 11 is used for detachably and fixedly connecting with the water injection rod 11. And under the action of the universal joint, the adjustable angle of the water injection rod 11 in the vertical plane is less than or equal to 70°.

[0045] When the staff installs the main water pipe, first remove the upper ring of the fastening ring of the water injection rod 11, put the water injection rod 11 into the lower ring and then fix it by bolts and nuts. After the fastening rings of the water injection rod 11 corresponding to the two hydraulic cylinders 17 have completed the fixation of the water injection rod 11, the staff can control the two sets of hydraulic cylinders 17 by controlling the hydraulic system, so as to realize the regulation of the height and angle of the water injection rod 11. Further, when the water flow and crushed coal body impact the water injection rod 11, the generated vibration is transmitted to the position of the hydraulic cylinder 17 along with the water injection rod 11, and the vibration will be absorbed by the hydraulic cylinder 17. After the kinetic energy is transmitted into the oil cylinder, the oil bodies in the oil cylinder will generate friction with each other and with the inner wall of the oil cylinder, and the mechanical energy of the vibration will be converted into heat energy, thereby eliminating the vibration. And due to the supporting effect of the hydraulic cylinder 17, the water injection rod 11 will not generate large-amplitude vibration.

[0046] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0048] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A device for preventing the stringing of water injection rods in hydraulic fracturing, characterized in that, include: A thick-walled through-tube, wherein the thick-walled through-tube is provided with a water injection through-hole for inserting a water injection rod in a water injection fracturing process, and the water injection through-hole is provided with a water injection rod positioning mechanism for limiting the water injection rod, so as to control the fixed angle and height of the water injection rod, and the water injection rod positioning mechanism is connected to a hydraulic system for eliminating vibration on the water injection rod and fine-tuning the fixed angle and height of the water injection rod; an upper casing and a lower casing are respectively provided at both ends of the thick-walled through-tube, a top column is provided at the end of the upper casing away from the thick-walled through-tube, and a lifting mechanism for controlling the height adjustment of the thick-walled through-tube is fixedly provided at the end of the lower casing away from the thick-walled through-tube; The water injection rod positioning mechanism includes two fixed plates fixedly arranged on the thick-walled through-tube at the positions at both ends of the water injection through-holes, and the fixed plates are both provided with movable clearance grooves in coordination with the water injection through-holes, and the fixed plates are provided with a plurality of positioning pin holes perpendicular to the length direction of the movable clearance grooves, and the positioning pin holes are provided with water injection rod positioning pins; Vibration filter tracks are provided on the thick-walled through-tubes at positions corresponding to the two fixed plates. The fixed plates are slidably connected to the vibration filter tracks. A vibration filter oil bag is provided in the vibration filter track. The vibration filter oil bag is connected to the hydraulic system oil circuit. The lifting mechanism includes a retractable hydraulic cylinder arranged at the end of the lower casing away from the thick-walled through-tube, the retractable hydraulic cylinder is provided with a hydraulic single support at the end away from the lower casing, and a single liquid injection hole is provided on the side of the hydraulic single support, and the single liquid injection hole is connected to the hydraulic system oil circuit.

2. The hydraulic fracturing water injection rod string anti-sticking device according to claim 1, characterized in that, The water injection counter-piercing holes are arranged as rectangular through holes along the length direction of the thick-wall counter-piercing tubes, so as to provide space for the water injection rod to move in the water injection counter-piercing holes according to the drilling height and angle.

3. A hydraulic fracturing water injection rod string anti-stringing device according to claim 1, characterized in that, The two fixing plates are provided with a height difference in height direction.

4. A hydraulic fracturing water injection rod string anti-stringing device according to claim 1, characterized in that, There are multiple water injection rod locating pins, which can be divided into two groups and inserted into the locating pin holes on the two fixed plates. Any water injection rod locating pin on the fixed plate on the same side is inserted into the adjacent locating pin hole. The water injection rods are all set through the gaps between the water injection rod locating pins in the two groups of water injection rod locating pin groups to clamp the water injection rods.

5. The hydraulic fracturing water injection rod string anti-stringing device according to claim 1, characterized in that The water injection rod positioning mechanism includes two groups of hydraulic cylinders arranged on both sides of the water injection perforation channel. The two groups of hydraulic cylinders are respectively fixedly arranged on one end of the thick-walled perforation pipe close to the upper casing and one end close to the lower casing, and the telescopic ends of the two groups of hydraulic cylinders are both set towards the direction of the water injection perforation. The telescopic ends of the hydraulic cylinders are detachably fixedly connected to the water injection rod.

6. A hydraulic fracturing device for preventing the injection rod string from sticking, as described in claim 5, characterized in that, The telescopic end of the hydraulic oil cylinder is provided with a universal joint, and the universal joint is fixedly connected to a water injection rod fastening ring, and the water injection rod fastening ring is used for detachable fixed connection with the water injection rod.

7. The hydraulic fracturing water injection rod string rod preventing device according to claim 6, characterized in that, The water injection rod can be adjusted to an angle range of less than or equal to 70 degrees under the action of the universal joint.

8. A hydraulic fracturing device for preventing the injection rod string from sticking, according to any one of claims 1-7, characterized in that, The water injection rod passes through the water injection through-hole and is sleeved with a fixing three-ring at a position close to the fixing plate toward the drilling section.

9. A hydraulic fracturing water injection rod string anti-stringing device according to claim 1, characterized in that, The lower casing is fixedly connected to the telescopic end of the telescopic hydraulic cylinder via a flange.

10. A hydraulic fracturing device for preventing the injection rod string from being strung as claimed in claim 1, characterized in that, The top column is provided with a serrated surface at one end away from the upper sleeve.

11. A hydraulic fracturing water injection rod string anti-stringing device according to claim 1, characterized in that, The upper casing, the thick-walled through pipe, and the lower casing are detachably arranged.

Images