Fixed-distance directional sliding device, fishbone well completion pipe string and construction method

Abstract

The invention provides a fixed-distance directional sliding device, a fishbone well completion pipe string and a construction method, and belongs to the technical field of oil and gas exploitation. The fixed-distance directional sliding device comprises a central pipe, a plurality of sliding grooves parallel to the central axis are formed in the outer wall of the central pipe, a sliding sleeve is arranged on the outer wall of the central pipe in a sleeving mode, a plurality of guiding sliding pins are arranged on the sliding sleeve in the circumferential direction, and the guiding sliding pins are arranged at the positions of the sliding grooves. The fishbone well completion pipe string comprises a casing pipe, a lower oil pipe, a fixed-distance directional sliding device and an upper oil pipe are sequentially arranged in the casing pipe from bottom to top, and a perforating gun and a spraying needle pipe are sequentially arranged in the lower oil pipe from bottom to top. According to the invention, perforating bullet perforation and hydraulic jet drilling are combined, the drilling process of perforation first and then jet is realized, the problem of cutting the casing wall is avoided, the perforation efficiency is improved, and the multi-branch fishbone well technology is applicable to the cased well.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas exploitation, and in particular relates to a fixed-distance directional sliding device, a herringbone completion string and a construction method. Background Art

[0002] The multi-branch herringbone well technology is a process for increasing the production of oil layers. It uses a small-diameter flexible pipe to achieve steering in the casing or open hole and drills in the reservoir by high-pressure hydraulic rock breaking. It is a new drilling and completion technology for the purpose of liberating the reservoir under the premise of safe drilling and reservoir protection. This technology can directional drill multiple directional wellbores with a length of up to 10m in different directions of the oil layer to achieve the connection between the wellbore and the reservoir. Through the "parallel drilling" method, multiple branches are formed in the reservoir to increase the drainage area of ​​the reservoir, thereby achieving the purpose of increasing crude oil production.

[0003] Chinese patent publication CN105443085A discloses an oil and gas production device and method, which utilizes multi-branch fishbone well technology to achieve reservoir transformation and increase oil and gas production. The device includes a jet nipple and an adjustment nipple connected to the jet nipple, wherein a through mounting hole is provided on the side wall of the jet nipple, and an inner cavity oil hole for oil and gas to flow from the formation into production is provided on the adjustment nipple. In the initial state, the needle tube is installed in the inner cavity of the jet nipple, and in the process of pumping liquid into the jet nipple, the needle tube extends in the formation to form a production channel. However, this method cannot be constructed in the casing and can only be applied in open hole wells, which limits its scope of application. Summary of the invention

[0004] The purpose of the present invention is to solve the difficulties existing in the above-mentioned prior art, and to provide a fixed-distance directional sliding device, a fishbone completion string and a construction method, which utilizes the advantages of perforating and drilling through the casing, and superimposes the jet drilling distance on the premise of forming the initial channel distance through perforation, which can not only effectively perforate the casing and improve the hole opening efficiency, but also increase the water jet extension limit to connect different reservoirs.

[0005] One of the purposes of the present invention is to provide a fixed distance and directional sliding device.

[0006] A second object of the present invention is to provide a herringbone completion string.

[0007] The third object of the present invention is to provide a herringbone completion construction method.

[0008] The present invention is achieved through the following technical solutions:

[0009] A first aspect of the present invention provides a fixed-distance directional sliding device, comprising a central tube, a plurality of sliding grooves parallel to the central axis are arranged on the outer wall of the central tube, and a sliding sleeve is sleeved on the outer wall of the central tube.

[0010] A further improvement of the present invention is:

[0011] A plurality of guide sliding pins are arranged on the sliding sleeve along the circumferential direction, and the guide sliding pins are arranged at the positions of the sliding grooves.

[0012] The second aspect of the present invention provides a fishbone completion string, including a casing, in which a lower oil pipe, the above-mentioned fixed-distance directional sliding device and an upper oil pipe are arranged in sequence from bottom to top, and a perforating gun and an injection needle are arranged in sequence from bottom to top in the lower oil pipe, and the bottom of the lower oil pipe is blocked.

[0013] A further improvement of the present invention is:

[0014] The central tube of the fixed-distance directional sliding device is connected to the bottom of the upper oil pipe through threads, and is connected to the top of the lower oil pipe through threads.

[0015] A further improvement of the present invention is:

[0016] The upper sleeve of the lower oil pipe is provided with an oil pipe anchor, which is threadedly connected to the sliding sleeve. By rotating the upper oil pipe, the center pipe and the sliding groove are driven to rotate, and then the sliding sleeve and the guide sliding pin are driven to rotate, which drives the oil pipe anchor to rotate so that the oil pipe anchor is opened and anchored on the casing wall, thereby fixing the sliding sleeve on the casing.

[0017] A further improvement of the present invention is:

[0018] 4 to 5 rows of injection needle tubes are arranged axially on the lower oil pipe, and 3 to 4 injection needle tubes are evenly arranged in each row on the radial cross section of the lower oil pipe;

[0019] Correspondingly, 4 to 5 perforating guns are arranged axially on the lower oil pipe, and each perforating gun is evenly arranged with 3 to 4 perforating bullets in the radial section.

[0020] A further improvement of the present invention is:

[0021] The distance between two adjacent perforating guns is the same as the distance between two adjacent rows of injection needle tubes.

[0022] A further improvement of the present invention is:

[0023] The vertical distance between the injection needle tube and the perforating gun corresponding to the injection needle tube is not greater than the length of the sliding groove.

[0024] A further improvement of the present invention is:

[0025] The jet needle tube is arranged on the lower oil pipe through a hole slideway;

[0026] A penetrating mounting hole is arranged on the side wall of the lower oil pipe, a hole slide is arranged in the mounting hole, one end of the injection needle tube is inserted into the hole slide and a self-feeding nozzle is arranged at the end thereof, and the other end of the injection needle tube is located in the inner cavity of the lower oil pipe.

[0027] A third aspect of the present invention provides a herringbone completion method, which specifically comprises the following steps:

[0028] Step 1: first, install the perforating gun and the jet needle tube in the lower oil pipe, connect the upper oil pipe and the lower oil pipe at both ends of the central pipe of the fixed-distance directional sliding device respectively, and put the oil pipe anchor sleeve on the lower oil pipe and connect it with the sliding sleeve of the fixed-distance directional sliding device through threads;

[0029] Step 2, lower the oil pipe assembled in step 1 into the casing, rotate the upper oil pipe, drive the oil pipe anchor to rotate so that the oil pipe anchor is opened and anchored on the casing wall, and fix the sliding sleeve on the casing;

[0030] Step 3, by holding the pressure in the pipe, using a perforating gun to perforate, thereby forming perforation holes on the casing;

[0031] Step 4, the oil pipe is moved downward, and the center pipe moves downward along the sliding groove in a directional and fixed distance, but the center pipe cannot rotate during translation to ensure that the orientation remains unchanged during sliding. The downward movement of the center pipe drives the injection needle tube to move downward until it is aligned with the perforation hole;

[0032] Step 5: The ground pump truck pressurizes the upper oil pipe, and the high-pressure fluid is ejected through the jet needle tube. The jet needle tube automatically enters the perforation hole under the action of self-propelled force. The ground high-pressure pump drives the lower jet needle tube to drill along the channel formed by the perforation with water jet to break the rock.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] During construction, the present invention first uses a perforating gun to perforate the casing to form a preliminary channel, then lowers the oil pipe to move the center pipe downward, thereby driving the jet needle tube to move downward to align with the initial channel formed by the perforation, and finally uses a high-pressure pump truck to pump pressure, and the needle tube drills along the blasthole jet. This technology can not only effectively perforate the casing and improve the perforation efficiency, but also increase the extension limit of the water jet to connect different reservoirs.

[0035] The present invention combines perforating bullet perforating with hydraulic jet drilling to realize a drilling process of perforating first and then jetting, thereby avoiding the problem of cutting the casing wall, improving the hole opening efficiency, and making the multi-branch herringbone well technology applicable to cased wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of a fixed-distance directional sliding device in the present invention;

[0037] Figure 2It is a structural schematic diagram of a herringbone completion string provided by the present invention;

[0038] Figure 3 This is the assembly structure diagram of the jet needle tube on the lower oil pipe;

[0039] Figure 4 It is a structural diagram of a self-advancing sprinkler.

[0040] In the figure,

[0041] 1. Directional and fixed-distance sliding device, 101. Sliding sleeve, 102. Guide sliding pin, 103. Sliding groove,

[0042] 104. Center tube,

[0043] 2. Jet needle,

[0044] 3. Perforating gun,

[0045] 4. Eyelet slide,

[0046] 5. Self-advancing nozzle, 501. shell, 502. rearward nozzle, 503. forward nozzle. DETAILED DESCRIPTION

[0047] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0048] The main idea of ​​the present invention is to combine perforating bullets with hydraulic jet drilling to achieve a drilling process of perforating first and then jetting. During construction, a perforating gun is first used to perforate the casing to form a preliminary channel, and then the oil pipe is lowered to move the center pipe downward to drive the jet needle tube downward to align with the initial channel formed by the perforation. Finally, a high-pressure pump truck is used to pressurize the needle tube, and the needle tube drills along the blasthole jet. This technology can not only effectively perforate the casing and improve the hole opening efficiency, but also increase the extension limit of the water jet to connect different reservoirs.

[0049] [Example 1]

[0050] This embodiment provides a fixed distance directional sliding device, such as Figure 1 As shown, it includes a central tube 104, and a plurality of sliding grooves 103 parallel to the central axis are provided on the outer wall of the central tube 104. Preferably, four sliding grooves 103 are evenly arranged along the outer wall of the central tube 104. A sliding sleeve 101 is sleeved on the central tube 104, and a plurality of guide sliding pins 102 are circumferentially arranged on the sliding sleeve 101, and the guide sliding pins 102 are arranged at the position of the sliding grooves 103. The guide sliding pins 102 cooperate with the sliding grooves 103 to limit the up and down movement of the central tube 104.

[0051] The sliding sleeve 101 is sleeved on the outer wall of the central tube 104 and fixed by the guide sliding pin 102. The guide sliding pin 102 plays a limiting role, so that the vertical movement distance of the central tube 104 is limited within the length range of the sliding groove 103. Among them, the limiting function of the guide sliding pin 102 is mainly: when the central tube 104 moves up and down to the upper end or the lower end of the sliding groove 103, the guide limiting pin 102 will be blocked by the sliding groove 103, thereby limiting its movement; the guiding sliding pin 102 plays a guiding role mainly because the guide sliding pin 102 on the sliding sleeve 101 is set at the position of the sliding groove, so that the central tube 104 can only move up and down, and cannot rotate.

[0052] External threads are provided on the outer walls of the upper and lower ends of the central tube 104, so that the upper and lower ends of the central tube 104 are connected to the oil pipe through the threads respectively.

[0053] Both ends of the sliding sleeve 103 are provided with external threads, which facilitates the threaded connection between the sliding sleeve 101 and the oil pipe anchor. During assembly, the center pipe 104 is connected to the oil pipe through threads, and then the oil pipe anchor is sleeved outside the oil pipe. The sliding sleeve 101 is threadedly connected to the oil pipe anchor, and the oil pipe anchor is opened and anchored on the casing wall by rotating the oil pipe, so that the sliding sleeve is fixed on the casing. A guide sliding pin 102 is fixed on the sliding sleeve 101, and the guide sliding pin 102 cooperates with the sliding groove 103 to limit the up and down movement of the center pipe 104. The sliding sleeve 101 is set at the bottom of the sliding groove 103, so that the downward movement of the oil pipe drives the center pipe 104 downward, so that the center pipe 104 can only move downward a certain distance at most, that is, the length of the sliding groove 103.

[0054] [Example 2]

[0055] This embodiment provides a herringbone completion string, such as Figure 2 As shown, it includes a casing, in which a lower oil pipe, the fixed-distance directional sliding device 1 described in Example 1 and an upper oil pipe are arranged in sequence from bottom to top, a perforating gun 3 and an injection needle tube 2 are arranged in sequence from bottom to top in the lower oil pipe, and the bottom of the lower oil pipe is blocked.

[0056] The central tube 104 of the fixed-distance directional sliding device 1 is connected to the bottom of the upper oil pipe through threads, and is connected to the top of the lower oil pipe through threads.

[0057] The upper sleeve of the lower oil pipe is provided with an oil pipe anchor, which is connected to the sliding sleeve 101 by threads. By rotating the upper oil pipe, the center pipe 104 and the sliding groove 103 are driven to rotate, and then the sliding sleeve 101 and the guide sliding pin 102 are driven to rotate, which drives the oil pipe anchor to rotate so that the oil pipe anchor is opened and anchored on the casing wall, so that the sliding sleeve is fixed on the casing, and the center pipe 104 can move up and down at this time.

[0058] There are 16 to 20 jet needle tubes 2 arranged on the lower oil pipe. Preferably, 4 to 5 rows of jet needle tubes 2 are arranged axially on the lower oil pipe, and each row of jet needle tubes 2 is evenly arranged with 3 to 4 jet needle tubes on the radial section of the lower oil pipe. Accordingly, 4 to 5 perforating guns 3 are arranged axially on the lower oil pipe, and each perforating gun 3 is evenly arranged with 3 to 4 perforating bullets on the radial section. The distance between two adjacent perforating guns 3 is the same as the distance between two adjacent rows of jet needle tubes 2.

[0059] Preferably, the perforating gun 3 is installed within a range of 20m-30m from the bottom of the lower oil pipe, and the jet needle tube 2 is installed on the perforating gun 3 within a range of 10m-20m. Note that the perforating bullet and the orifice of the jet needle tube 2 should be accurately installed at the same position on the ground. Specifically, the number of perforations is the same as the number of jet needle tubes and corresponds one to one. A perforating gun contains 3 to 4 perforating bullets, and the number of perforating bullets is the same as the number of jet needle tubes, because the perforating bullets form perforation holes, and the jet needle tubes drill along the perforation holes.

[0060] Among them, the vertical distance between the jet needle tube 2 and the perforating gun 3 corresponding to the jet needle tube 2 is not greater than the length of the sliding groove. For example, from bottom to top, the vertical distance between the jet needle tube 2 in the first row and the first jet gun 3 is not greater than the length of the sliding groove, and the vertical distance between the jet needle tube 2 in the second row and the second jet gun 3 is not greater than the length of the sliding groove, and so on. Since the downward movement distance of the center tube is at most the length of the sliding groove (when the sliding sleeve 101 is located at the lower end of the sliding groove), the length of the sliding groove 103 should be greater than or equal to the distance between the jet needle tube 2 and the perforating hole, so as to ensure that the downward movement of the center line tube drives the jet needle tube 2 to move downward and automatically align with the blast hole produced by the perforation.

[0061] During construction, the perforating gun 3 is first used to perforate the casing to form a preliminary channel, and then the oil pipe is lowered to move the central pipe 104 downward to drive the jet needle tube 2 downward to align with the initial channel formed by the perforation, and finally the high-pressure pump truck is used to pump pressure, and the jet needle tube 2 drills along the blast hole jet. This technology can not only effectively perforate the casing and improve the perforation efficiency, but also increase the extension limit of the water jet to connect different reservoirs.

[0062] [Example 3]

[0063] like Figure 3 As shown, the jet needle tube 2 is arranged on the lower oil pipe through the eyelet slide 4. Specifically, a penetrating mounting hole is arranged on the side wall of the lower oil pipe, the eyelet slide 4 is arranged in the mounting hole, one end of the jet needle tube 2 is inserted into the eyelet slide 4 and a self-propelled nozzle 5 is arranged at the end thereof, and the other end of the jet needle tube 2 is located in the inner cavity of the lower oil pipe. Liquid is pumped into the lower oil pipe through a pump truck on the ground. Driven by the high-pressure liquid, the jet needle tube breaks the rock and drills under the action of the self-propelled nozzle, and gradually extends to form a jet channel.

[0064] like Figure 4 As shown, the self-propelled nozzle 5 includes a shell 501, which is a trumpet-shaped structure. The end of the shell 501 with a small opening is connected to the end of the needle tube, and a rearward nozzle 502 is arranged inside the end of the shell 501 with a small opening. The rearward nozzle 502 is arranged from the side wall of the shell to the axial direction, and the angle with the axial direction of the shell is 30-45°. The end of the shell 501 with a large opening is provided with a forward nozzle 503 inside, and the forward nozzle 503 is parallel to the axial direction of the shell 501. When the pressure is accumulated in the lower oil pipe, the pressure is transmitted from the injection needle tube 2 to the self-propelled nozzle 5, and the self-propelled nozzle 5 breaks the rock through the forward nozzle 503, and the rearward nozzle 502 is pushed forward and continuously extends forward. Driven by the self-propelled nozzle 5, the injection needle tube 2 drills along the hole slideway to break the rock and extends to form a jet channel.

[0065] The arrangement and structure of the needle tube and the self-propelled nozzle in the present invention may also be existing technologies, as long as they can achieve their functions. For details, please refer to existing public documents and will not be repeated here.

[0066] [Example 4]

[0067] This embodiment provides a herringbone completion construction method, which specifically includes the following steps:

[0068] Step 1: First, install the perforating gun and the jet needle tube in the lower oil pipe, connect the upper oil pipe and the lower oil pipe at both ends of the central pipe of the fixed-distance directional sliding device respectively, and put the oil pipe anchor sleeve on the lower oil pipe and connect it with the sliding sleeve of the fixed-distance directional sliding device through threads; plug the bottom of the lower oil pipe;

[0069] Preferably, 16 to 20 jet needle tubes 2 are arranged on the lower oil pipe. Preferably, 4 to 5 rows of jet needle tubes 2 are arranged axially on the lower oil pipe, and 3 to 4 jet needle tubes are evenly arranged in each row on the radial section of the lower oil pipe. Correspondingly, 4 to 5 perforating guns are arranged axially on the lower oil pipe, and each perforating gun is evenly arranged with 3 to 4 perforating bullets in the radial section. The distance between two adjacent perforating guns is the same as the distance between two adjacent rows of jet needle tubes.

[0070] Preferably, the perforating gun is installed within a range of 20m-30m from the bottom of the lower oil pipe, and the jet needle tube is installed on the perforating gun within a range of 10m-20m. Note that the perforating bullets and the orifices of the jet needle tubes should be accurately installed at the same position on the ground. Specifically, the number of perforations is the same as the number of jet needle tubes and corresponds one to one. A perforating gun contains 3 to 4 perforating bullets, and the number of perforating bullets is the same as the number of jet needle tubes, because the perforating bullets form perforation holes, and the jet needle tubes drill along the perforation holes.

[0071] Among them, the vertical distance between the jet needle tube 2 and the perforating gun 3 corresponding to the jet needle tube 2 is not greater than the length of the sliding groove 103. For example, from bottom to top, the vertical distance between the jet needle tube in the first row and the first jet gun is not greater than the length of the sliding groove, and the vertical distance between the jet needle tube in the second row and the second jet gun is not greater than the length of the sliding groove, and so on. Since the downward movement distance of the center tube is at most the length of the sliding groove (when the sliding sleeve is located at the lower end of the sliding groove), the length of the sliding groove should be greater than or equal to the distance between the jet needle tube and the perforating hole, so as to ensure that the downward movement of the center line tube drives the needle tube orifice to move downward and automatically align with the blast hole produced by the perforation.

[0072] Step 2, lower the oil pipe assembled in step 1 into the casing, rotate the upper oil pipe, drive the oil pipe anchor to rotate so that the oil pipe anchor is opened and anchored on the casing wall, and fix the sliding sleeve on the casing;

[0073] Step 3, by holding the pressure in the pipe, using a perforating gun to perforate, thereby forming perforation holes on the casing;

[0074] Step 4, move the oil pipe downward. The center pipe can move downward along the sliding groove in a directional and fixed distance, but the center pipe cannot rotate during translation to ensure that the orientation remains unchanged during sliding. The downward movement of the center pipe drives the injection needle tube to move downward to a position aligned with the perforating blasthole;

[0075] Step 5: The ground pump truck pressurizes the upper oil pipe, and the high-pressure fluid is ejected through the jet needle tube. The jet needle tube automatically enters the perforation hole under the action of self-propelled force. The ground high-pressure pump drives the lower jet needle tube to drill along the channel formed by the perforation with water jet to break the rock.

[0076] The present invention combines perforating bullet perforating with hydraulic jet drilling to realize a drilling process of perforating first and then jetting, thereby avoiding the problem of cutting the casing wall, improving the hole opening efficiency, and making the multi-branch herringbone well technology applicable to cased wells.

[0077] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0078] In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0079] The above technical solution is only one implementation mode of the present invention. For those skilled in the art, it is easy to make various types of improvements or modifications based on the principles disclosed in the present invention, and it is not limited to the technical solution described in the above specific embodiments of the present invention. Therefore, the above description is only preferred and does not have a restrictive meaning.

Claims

1. A fixed distance directional sliding device, characterized in that: It comprises a central tube, a plurality of sliding grooves parallel to the central axis are arranged on the outer wall of the central tube, and a sliding sleeve is sleeved on the outer wall of the central tube.

2. The fixed distance directional sliding device according to claim 1, characterized in that: A plurality of guide sliding pins are arranged on the sliding sleeve along the circumferential direction, and the guide sliding pins are arranged at the positions of the sliding grooves.

3. A herringbone completion string, characterized in that: It comprises a casing, in which a lower oil pipe, a fixed-distance directional sliding device according to claim 1 or 2 and an upper oil pipe are arranged in sequence from bottom to top, in which a perforating gun and an injection needle are arranged in sequence from bottom to top, and the bottom of the lower oil pipe is plugged.

4. The herringbone completion string according to claim 3, characterized in that: The central tube of the fixed-distance directional sliding device is connected to the bottom of the upper oil pipe through threads, and is connected to the top of the lower oil pipe through threads.

5. The herringbone completion string according to claim 3, characterized in that: The upper sleeve of the lower oil pipe is provided with an oil pipe anchor, which is threadedly connected to the sliding sleeve. By rotating the upper oil pipe, the center pipe and the sliding groove are driven to rotate, and then the sliding sleeve and the guide sliding pin are driven to rotate, which drives the oil pipe anchor to rotate so that the oil pipe anchor is opened and anchored on the casing wall, thereby fixing the sliding sleeve on the casing.

6. The herringbone completion string according to claim 3, characterized in that: 4 to 5 rows of jet needles are arranged axially on the lower oil pipe, and 3 to 4 jet needles are evenly arranged in each row on the radial section of the lower oil pipe. Correspondingly, 4 to 5 perforating guns are arranged axially on the lower oil pipe, and each perforating gun is evenly arranged with 3 to 4 perforating bullets on the radial section.

7. The herringbone completion string according to claim 6, characterized in that: The distance between two adjacent perforating guns is the same as the distance between two adjacent rows of injection needle tubes.

8. The herringbone completion string according to claim 6, characterized in that: The vertical distance between the injection needle tube and the perforating gun corresponding to the injection needle tube is not greater than the length of the sliding groove.

9. The herringbone completion string according to claim 3, characterized in that: The jet needle tube is arranged on the lower oil pipe through a hole slideway; A penetrating mounting hole is arranged on the side wall of the lower oil pipe, a hole slide is arranged in the mounting hole, one end of the injection needle tube is inserted into the hole slide and a self-feeding nozzle is arranged at the end thereof, and the other end of the injection needle tube is located in the inner cavity of the lower oil pipe.

10. A herringbone completion method, characterized in that: The specific steps include: Step 1: first, install the perforating gun and the jet needle tube in the lower oil pipe, connect the upper oil pipe and the lower oil pipe at both ends of the central pipe of the fixed-distance directional sliding device respectively, and put the oil pipe anchor sleeve on the lower oil pipe and connect it with the sliding sleeve of the fixed-distance directional sliding device through threads; Step 2, lower the oil pipe assembled in step 1 into the casing, rotate the upper oil pipe, drive the oil pipe anchor to rotate so that the oil pipe anchor is opened and anchored on the casing wall, and fix the sliding sleeve on the casing; Step 3, by holding the pressure in the pipe, using a perforating gun to perforate, thereby forming perforation holes on the casing; Step 4, the oil pipe is moved downward, and the center pipe moves downward along the sliding groove in a directional and fixed distance, but the center pipe cannot rotate during translation to ensure that the orientation remains unchanged during sliding. The downward movement of the center pipe drives the injection needle tube to move downward until it is aligned with the perforation hole; Step 5: The ground pump truck pressurizes the upper oil pipe, and the high-pressure fluid is ejected through the jet needle tube. The jet needle tube automatically enters the perforation hole under the action of self-propelled force. The ground high-pressure pump drives the lower jet needle tube to drill along the channel formed by the perforation with water jet to break the rock.

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