Hydraulic valve group, hydraulic nipple, downhole string perforating device and control method

Abstract

This invention provides a hydraulic valve assembly, a hydraulic sub, a downhole tubing perforation device, and a control method, belonging to the field of oil and gas exploration technology. It includes: an installation body with a main oil passage, a cutter head oil passage, an anchoring oil passage, a recovery oil passage, and two oil / line passages; a first safety valve, a second safety valve, a third safety valve, a first solenoid valve, a second solenoid valve, a third solenoid valve, and a check valve are installed on it; the first safety valve is connected to the main oil passage, the second safety valve is connected to the cutter head oil passage, the third safety valve is connected to the anchoring oil passage, and both are connected to the oil / line passages; the first solenoid valve, the second solenoid valve, and the check valve are all connected to the main oil passage, and the check valve is also connected to the third solenoid valve; the first solenoid valve is connected to the cutter head oil passage; the third solenoid valve is connected to the anchoring oil passage; and the second solenoid valve is connected to the recovery oil passage. This invention has a simple overall structure, is easy to install and disassemble, facilitates maintenance, and reduces the overall length.

Description

Technical Field

[0001] This invention relates to the field of oil and gas exploration technology, specifically to a hydraulic valve assembly, a hydraulic sub, a downhole tubing perforation device, and a control method for the downhole tubing perforation device. Background Technology

[0002] During the exploration and development of oil and gas fields, complex downhole engineering situations frequently arise, such as well completion strings getting stuck or tubing or drill pipe failing to circulate well fluid normally. These situations necessitate pressurized perforation to connect the oil (drill) casing before cutting, pulling up, and other operations. Therefore, the perforation tools or equipment used are crucial. Currently, cable-driven shaped charge perforators are mainly used. However, the explosives, shaped charge perforating shells, and electric detonators used are all strictly controlled civilian explosives, requiring transportation and blasting permits before use. These procedures are cumbersome and time-consuming, making it difficult to meet the need for rapid response to complex downhole string situations. Therefore, an electro-hydraulic downhole string perforation tool that does not require civilian explosives has been designed.

[0003] For example, Chinese patent CN202323332410.X discloses a downhole electric drilling device, including a hydraulic module and a drilling head module. The hydraulic module includes a hydraulic housing, a pull rod, and a piston. The drilling head module includes a drilling component, a drilling base, and a pressure relief head. The hydraulic module and the drilling head module are connected by a connecting pipe. Each component of the drilling head module is provided with a passage for hydraulic oil to pass through. This downhole electric drilling device is harmless to humans and the environment, can drill multiple holes simultaneously, is compact, easy to connect, simple to operate, stable and reliable, has a high success rate, is convenient and quick, requires no vibration, and has no well deviation requirements. Chinese patent CN202310971885.9 discloses a downhole tubing string electrically controlled drilling tool, including a drilling execution section, a lower anchoring section, a main rotation power section, an upper anchoring section, and a hydraulic control section. The hydraulic control section includes a hydraulic cylinder, a hydraulic isolation joint, hydraulic pipelines, etc. The hydraulic oil pump port is located at the upper middle part of the hydraulic pump and does not penetrate the entire hydraulic pump. This electrically controlled drilling tool for tubing achieves anchoring and unanchoring by controlling multiple oil chambers through different oil circuits. It should be noted that the hydraulic volume within the oil chambers changes with anchoring and unanchoring, and a balance piston is installed inside to compensate for the change in hydraulic volume.

[0004] However, the following shortcomings exist: 1) The overall outer diameter and length of the hydraulic valve group designed inside the tool are too large, which is not convenient for drilling operations; 2) The tool's oil and electrical interfaces are not modularly designed, making disassembly and assembly inconvenient and maintenance difficult. Summary of the Invention

[0005] The purpose of this invention is to provide a hydraulic valve assembly, a hydraulic sub, a downhole tubing perforation device, and a control method to solve the problems mentioned above, such as the excessively large outer diameter and length of the hydraulic valve assembly designed inside the tool, which are inconvenient for drilling operations; and the lack of modular design for the tool's hydraulic and electrical interfaces, which makes disassembly and assembly inconvenient and maintenance difficult.

[0006] To achieve the above objectives, embodiments of the present invention provide a hydraulic valve assembly, the hydraulic valve assembly comprising: The mounting body has a main oil passage hole, a cutter head oil passage hole, an anchoring oil passage hole, a recovery oil passage hole, and two oil and wire passage holes opened along its length; the mounting body is equipped with a first safety valve, a second safety valve, a third safety valve, a first solenoid valve, a second solenoid valve, a third solenoid valve, and a check valve; The oil inlet of the first safety valve is connected to the main oil passage hole, the oil inlet of the second safety valve is connected to the cutter head oil passage hole, the oil inlet of the third safety valve is connected to the anchoring oil passage hole, and the oil outlets of the first safety valve, the second safety valve and the third safety valve are connected to the corresponding oil passage holes. The oil inlet of the first solenoid valve, the oil inlet of the second solenoid valve, and the oil inlet of the check valve are all connected to the main oil passage, and the oil outlet of the check valve is connected to the oil inlet of the third solenoid valve. The oil outlet of the first solenoid valve is connected to the oil passage of the cutter head; The oil outlet of the third solenoid valve is connected to the anchoring oil passage hole; The oil outlet of the second solenoid valve is connected to the recovery oil passage hole.

[0007] Optionally, the diameter of the oil passage hole is larger than the diameter of the cutter head oil passage hole, the anchoring oil passage hole, and the recovery oil passage hole.

[0008] Optionally, the second safety valve and the third safety valve are disposed at an angle relative to each other on the mounting body.

[0009] Optionally, at least one end of the mounting body is provided with a multi-core plug and three oil passage connectors, and the cutter head oil passage, the anchoring oil passage, and the recovery oil passage are each connected to an oil passage connector through a corresponding position distribution adjustment oil passage.

[0010] Optionally, the end of the mounting body is provided with an inner groove, and the multi-core plug and the oil passage connector are both disposed in the inner groove.

[0011] Optionally, both the multi-core plug and the oil passage connector are provided with a removable connector cover via a threaded connection.

[0012] Optionally, the first safety valve, the second safety valve, the third safety valve, the first solenoid valve, the second solenoid valve, the third solenoid valve, and the one-way valve are all located between the two oil passage holes.

[0013] Optionally, the hydraulic valve assembly further includes: A first pressure sensor and a second pressure sensor are mounted on the mounting body and are used to detect the oil circuit pressure; the first pressure sensor is connected to the cutter head oil circuit hole; the second pressure sensor is connected to the anchoring oil circuit hole.

[0014] Optionally, the first safety valve, the first solenoid valve, the second solenoid valve, the one-way valve, the third solenoid valve, the second pressure sensor, the first pressure sensor, the second safety valve, and the third safety valve are sequentially arranged on the mounting body along the length of the mounting body.

[0015] Optionally, the mounting body is provided with multiple mounting holes, and the first safety valve, the first solenoid valve, the second solenoid valve, the one-way valve, the third solenoid valve, the first pressure sensor, the second pressure sensor, the second safety valve and the third safety valve are disposed in a corresponding mounting hole, and each mounting hole is provided with a sealing ring and a sealing cap.

[0016] Optionally, the first solenoid valve and the third solenoid valve are normally closed solenoid valves, and the second solenoid valve is a normally open solenoid valve.

[0017] Secondly, the present invention also provides a hydraulic sub-junction, comprising: The aforementioned hydraulic valve assembly; An oil pumping mechanism is provided, wherein the oil outlet of the oil pumping mechanism is connected to the main oil passage of the hydraulic valve group, and is used to inject high-pressure oil into the main oil passage.

[0018] Thirdly, the present invention also provides a downhole tubing perforation device, the device comprising: The aforementioned hydraulic sub-section; The moving section is detachably connected to the hydraulic section. The moving section is provided with a cutter head mechanism and an anchoring mechanism. The hydraulic piston of the cutter head mechanism is connected to the cutter head oil passage of the hydraulic valve group, and the hydraulic piston of the anchoring mechanism is connected to the anchoring oil passage of the hydraulic valve group.

[0019] Fourthly, the present invention also provides a control method for a downhole tubing perforation device, the method comprising: Upon receiving the drilling start command, the system controls the oil pump injection mechanism to inject high-pressure oil into the main oil passage hole. Simultaneously, the system energizes the third solenoid valve to open the anchoring oil passage hole, thereby controlling the anchoring rod of the anchoring mechanism to extend. Once the command to extend the anchor rod into position is received, the first solenoid valve is energized to open the cutter head oil passage, thereby controlling the extension of the cutter head mechanism.

[0020] Optionally, the method further includes: Once the drilling completion command is received, the first solenoid valve is de-energized to reverse the direction of the oil in the cutter head oil passage, thereby controlling the cutter head mechanism to retract. Once the command to retract the anchor rod into position is received, the third solenoid valve is de-energized to reverse the direction of the oil in the anchoring oil passage, thereby controlling the retraction of the anchor rod of the anchoring mechanism.

[0021] This technical solution involves creating a main oil passage hole, a cutter head oil passage hole, an anchoring oil passage hole, a recovery oil passage hole, and two oil and wire passage holes along the length of the mounting body. Furthermore, the mounting body is equipped with a first safety valve, a second safety valve, a third safety valve, a first solenoid valve, a second solenoid valve, a third solenoid valve, and a check valve. This allows for corresponding hydraulic control through the coordination of different solenoid valves and oil passages. The overall structure is simple, with low processing cost and difficulty, convenient installation and disassembly, easy maintenance, reduced overall length, and increased ease of use.

[0022] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0023] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a cross-sectional schematic diagram of the hydraulic valve assembly provided by the present invention; Figure 2 This is a perspective front view of the hydraulic valve assembly provided by the present invention; Figure 3 This is a perspective rear view of the hydraulic valve assembly provided by the present invention; Figure 4 This is a schematic diagram of the hydraulic circuit of the hydraulic valve assembly provided by the present invention; Figure 5 This is a flowchart of the control method for the first downhole tubing perforation device provided by the present invention; Figure 6 This is a flowchart of the control method for the second type of downhole tubing perforation device provided by the present invention.

[0024] Explanation of reference numerals in the attached figures 1-Mounting body; 101-Position distribution adjustment oil circuit; 102-Internal groove; 103 - Mounting hole; 104 - Sealing ring; 105 - Sealing cap; 11-Main oil passage hole; 12-Cutter head oil passage hole; 13-Anchoring oil passage hole; 14-Recovery oil passage hole; 15-Oil passage and wire passage hole; 16-Multi-pin plug 161-Connector cover; 17-Oil passage connector; 2-First safety valve; 3-Second safety valve; 4-Third safety valve; 5-First solenoid valve; 6-Second solenoid valve; 7-Third solenoid valve; 8-Check valve; 91 - First pressure sensor; 92 - Second pressure sensor. Detailed Implementation

[0025] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0026] In the embodiments of the present invention, unless otherwise stated, directional terms such as "up," "down," "left," and "right" generally refer to the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use.

[0027] The terms “first,” “second,” “third,” etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0028] The terms "parallel" and "perpendicular" do not mean that the components must be absolutely parallel or perpendicular, but rather that they can be slightly tilted. For example, "parallel" simply means that its direction is more parallel than "perpendicular," not that the structure must be completely parallel, but that it can be slightly tilted.

[0029] The terms "horizontal," "vertical," and "sag" do not imply that a component must be absolutely horizontal, vertical, or sagging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0030] Furthermore, terms like "roughly" and "basically" are used to indicate that the content does not require absolute precision, but rather allows for a certain degree of deviation. For example, "roughly equal" does not simply mean absolute equality; in actual production and operation, achieving absolute "equality" is difficult, and a certain degree of deviation is generally present. Therefore, besides absolute equality, "roughly equal to" also includes the aforementioned situation where a certain degree of deviation exists. Using this as an example, in other cases, unless otherwise specified, terms like "roughly" and "basically" have similar meanings.

[0031] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] Figure 1 This is a cross-sectional schematic diagram of the hydraulic valve assembly provided by the present invention; Figure 2 This is a perspective front view of the hydraulic valve assembly provided by the present invention; Figure 3 This is a perspective rear view of the hydraulic valve assembly provided by the present invention; Figure 4 This is a schematic diagram of the hydraulic circuit of the hydraulic valve assembly provided by the present invention; Figure 5 This is a flowchart of the control method for the first downhole tubing perforation device provided by the present invention; Figure 6 This is a flowchart of the control method for the second type of downhole tubing perforation device provided by the present invention.

[0033] like Figure 1-4 As shown, this embodiment provides a hydraulic valve assembly, which includes: The mounting body 1 has a main oil passage hole 11, a cutter head oil passage hole 12, an anchoring oil passage hole 13, a recovery oil passage hole 14 and two oil and wire passage holes 15 opened along the length direction; the mounting body 1 is equipped with a first safety valve 2, a second safety valve 3, a third safety valve 4, a first solenoid valve (5), a second solenoid valve 6, a third solenoid valve 7 and a one-way valve 8; The oil inlet of the first safety valve 2 is connected to the main oil passage 11, the oil inlet of the second safety valve 3 is connected to the cutter head oil passage 12, the oil inlet of the third safety valve 4 is connected to the anchoring oil passage 13, and the oil outlets of the first safety valve 2, the second safety valve 3 and the third safety valve 4 are connected to the corresponding oil passage and wire passage 15. The oil inlet of the first solenoid valve 5, the oil inlet of the second solenoid valve 6, and the oil inlet of the one-way valve 8 are all connected to the main oil passage 11, and the oil outlet of the one-way valve 8 is connected to the oil inlet of the third solenoid valve 7. The oil outlet of the first solenoid valve 5 is connected to the oil passage hole 12 of the cutter head; The oil outlet of the third solenoid valve 7 is connected to the anchoring oil passage 13; The oil outlet of the second solenoid valve 6 is connected to the recovery oil passage 14.

[0034] Specifically, in this embodiment, the mounting body 1 can be configured as a cylindrical structure. Since the hydraulic valve assembly contains both power lines and sensor signal lines, two oil passage holes 15 are provided, spaced apart within the mounting body 1. The signal line and power line are each located within one of the oil passage holes 15, allowing high-voltage and low-voltage electricity to pass through different holes, thus reducing signal interference during operation. This constitutes a specially designed oil circuit that meets the requirements for both motor wiring and oil passage at the lower end of the tool. Different oil passage holes are opened on the mounting body 1 to ensure the normal operation of the first solenoid valve 5, the second solenoid valve 6, and the third solenoid valve 7, and their connecting wires can be placed in a specially designed cable tray on the mounting body 1. Inside; the first safety valve 2, the second safety valve 3, and the third safety valve 4 are installed on the mounting body 1 by cartridge mounting and are connected to the corresponding oil holes through the side-designed oil passage holes to ensure reliable operation. When the pressure exceeds the pressure threshold set by the safety valve itself, the safety valve releases pressure to improve the safety of the oil circuit. The one-way valve 8 is installed on the mounting body 1 by cartridge mounting and is designed to ensure unidirectional flow of the anchoring oil passage hole 13. In its oil circuit design, the screw mounting hole of the third solenoid valve 7 is rotated at a certain angle to ensure that its oil circuit does not affect other oil circuits. In addition, in order to achieve a reasonable arrangement of the above valves, the oil inlet body is optimized to be eccentric to the body by vertically setting process holes. More specifically, to reduce machining difficulty, the cutter head oil passage 12, anchoring oil passage 13, recovery oil passage 14, and two oil and wire passages 15 are designed as through holes. For the three oil passages that need to be sealed—cutter head oil passage 12, anchoring oil passage 13, and recovery oil passage 14—plugs are installed at the corresponding ends via threaded connections. When hydraulic oil enters the main oil passage 11 through the process hole, it reaches the inlet of the first safety valve 2, the inlet of the first solenoid valve 5, the inlet of the second solenoid valve 6, and the inlet of the check valve 8, respectively, and then enters the inlet of the third solenoid valve 7 through the outlet of the check valve 8.

[0035] Furthermore, the diameter of the oil passage hole 15 is larger than the diameter of the cutter head oil passage hole 12, the anchoring oil passage hole 13, and the recovery oil passage hole 14.

[0036] Specifically, in this embodiment, in order to increase the oil and wire passing capacity of the oil and wire passing hole 15, the inner diameter of the oil and wire passing hole 15 is designed to be larger so that the wire harness and oil can pass through.

[0037] Furthermore, such as Figure 2-3 As shown, the second safety valve 3 and the third safety valve 4 are arranged at an angle relative to each other on the mounting body 1.

[0038] Specifically, in this embodiment, the second safety valve 3 and the third safety valve 4 are arranged at an angle relative to each other on the mounting body 1 and are distributed in a cross pattern. This reduces the number of oil circuit process holes that need to be opened. By arranging them at an angle, their pressure ports are directly connected to the axial oil circuit holes, and their backs are directly connected to the oil and line holes 15, so there is no need to open additional oil circuit process holes.

[0039] Furthermore, such as Figure 1 As shown, at least one end of the mounting body 1 is provided with a multi-core plug 16 and three oil passage connectors 17. The cutter head oil passage 12, the anchoring oil passage 13, and the recovery oil passage 14 are respectively connected to an oil passage connector 17 through a corresponding position distribution adjustment oil passage 101.

[0040] Specifically, in this embodiment, a multi-core plug 16 and three oil passage connectors 17 are provided at at least one end of the mounting body 1, which are modularly designed with oil passages and electrical interfaces for easy disassembly and replacement with the lower tool.

[0041] More specifically, the cutter head oil passage 12, anchoring oil passage 13, and recovery oil passage 14 are each connected to a corresponding oil passage connector 17 through a corresponding position distribution adjustment oil passage 101. This arrangement optimizes the size and position of each oil passage connector 17, facilitating connection with other short sections.

[0042] Furthermore, such as Figure 2-3 As shown, the end of the mounting body 1 is provided with an inner groove 102, and the multi-core plug 16 and the oil passage connector 17 are both disposed in the inner groove 102.

[0043] Specifically, in this embodiment, an inner groove 102 is provided at the end of the mounting body 1, and the multi-core plug 16 and the oil passage connector 17 are both disposed in the inner groove 102 to protect the multi-core plug 16 and the oil passage connector 17.

[0044] Furthermore, such as Figure 1 As shown, both the multi-core plug 16 and the oil passage connector 17 are provided with a connector cover 161 that can be detached by means of threaded connection.

[0045] Specifically, in this embodiment, connector covers 161 are detachably provided on both the multi-core plug 16 and the oil passage connector 17 by means of threaded connection, which can realize quick installation and disassembly and protect the inside of the multi-core plug 16 and the oil passage connector 17.

[0046] In another embodiment, a sealing structure is designed on the oil passage connector 17 to ensure reliable sealing of the hydraulic oil in the oil passage when it is installed on the mounting body 1. A sealing structure is also designed on its other end to ensure reliable sealing of the hydraulic oil after it is connected to the lower end of the tool.

[0047] Furthermore, the first safety valve 2, the second safety valve 3, the third safety valve 4, the first solenoid valve 5, the second solenoid valve 6, the third solenoid valve 7, and the one-way valve 8 are all located between the two oil passage holes 15.

[0048] Specifically, in this embodiment, considering that all components inside the valve group module need to be arranged inside the oil tank, i.e. inside the instrument, and that its working pressure end and non-pressure-bearing end are both in hydraulic oil, each solenoid valve, each safety valve, and each pressure sensor must be connected to the oil tank. Therefore, the first safety valve 2, the second safety valve 3, the third safety valve 4, the first solenoid valve 5, the second solenoid valve 6, the third solenoid valve 7, and the check valve 8 are arranged between the two oil passage holes 15 to realize oil delivery. Moreover, this method can reduce the complexity of production and facilitate the processing of lateral process holes.

[0049] Furthermore, such as Figure 1-4 As shown, the hydraulic valve assembly further includes: A first pressure sensor 91 and a second pressure sensor 92 are disposed on the mounting body 1 and are used to detect the oil circuit pressure; the first pressure sensor 91 is connected to the cutter head oil circuit hole 12; the second pressure sensor 92 is connected to the anchoring oil circuit hole 13.

[0050] Specifically, in this embodiment, the first pressure sensor 91 and the second pressure sensor 92 are small in size. They are first placed in a sensor holder, and then the sensor holder is installed on the mounting body 1. They are connected to the oil circuit to be monitored through a process hole, and their connecting wires can be placed in a specially opened wire harness groove on the mounting body 1. The first pressure sensor 91 is connected to the cutter head oil circuit hole 12; the second pressure sensor 92 is connected to the anchoring oil circuit hole 13, realizing pressure monitoring of the two oil circuits, thereby achieving oil circuit control and monitoring and improving safety.

[0051] Furthermore, such as Figure 1-4 As shown, the first safety valve 2, the first solenoid valve 5, the second solenoid valve 6, the one-way valve 8, the third solenoid valve 7, the second pressure sensor 92, the first pressure sensor 91, the second safety valve 3, and the third safety valve 4 are sequentially arranged on the mounting body 1 along the length direction of the mounting body 1.

[0052] Specifically, in this embodiment, the first safety valve 2, the first solenoid valve 5, the second solenoid valve 6, the one-way valve 8, the third solenoid valve 7, the second pressure sensor 92, the first pressure sensor 91, the second safety valve 3, and the third safety valve 4 are sequentially arranged on the mounting body 1 along the length direction of the mounting body 1. This ensures a more compact structural distribution, optimizes the distribution position, effectively reduces the number of oil hole openings, and reduces manufacturing difficulty.

[0053] Furthermore, such as Figure 2-3 As shown, the mounting body 1 is provided with a plurality of mounting holes 103. The first safety valve 2, the first solenoid valve 5, the second solenoid valve 6, the one-way valve 8, the third solenoid valve 7, the first pressure sensor 91, the second pressure sensor 92, the second safety valve 3 and the third safety valve 4 are disposed in a corresponding mounting hole 103, and each mounting hole 103 is provided with a sealing ring 104 and a sealing cap 105.

[0054] Specifically, in this embodiment, to facilitate the installation and disassembly of the first safety valve 2, first solenoid valve 5, second solenoid valve 6, check valve 8, third solenoid valve 7, first pressure sensor 91, second pressure sensor 92, second safety valve 3, and third safety valve 4, as well as regular maintenance and repair, a cartridge mounting method is adopted. Therefore, multiple mounting holes 103 are provided on the mounting body 1, and the first safety valve 2, first solenoid valve 5, second solenoid valve 6, check valve 8, third solenoid valve 7, first pressure sensor 91, second pressure sensor 92, second safety valve 3, and third safety valve 4 are placed in the corresponding mounting holes 103. Secondly, to ensure that each valve and pressure sensor is isolated from the oil, a sealing ring 104 and a sealing cap 105 are provided on each mounting hole 103 to achieve a sealed connection, protecting each valve within the mounting body 1. More specifically, the sealing cap 105 is detachably connected to the mounting hole 103 by a threaded connection.

[0055] Furthermore, the first solenoid valve 5 and the third solenoid valve 7 are normally closed solenoid valves, and the second solenoid valve 6 is a normally open solenoid valve.

[0056] Specifically, in this embodiment, both the normally closed and normally open solenoid valves can switch the oil circuit after being energized. When the normally closed solenoid valve is de-energized, the main oil circuit is closed, and the hydraulic oil in the control circuit flows directly back to the oil tank. When energized, the hydraulic oil in the main oil circuit flows to the control port, and the oil tank port closes. Similarly, when the normally open solenoid valve is de-energized, the hydraulic oil in the main oil circuit flows directly to the control port, and the oil tank port closes. When energized, the main oil circuit closes, and the hydraulic oil in the control port flows directly to the oil tank. This method satisfies the switching and control of the oil flow direction in the oil circuit.

[0057] The hydraulic oil generated by the hydraulic pump is divided into three hydraulic oils that perform different actions. The anchoring hydraulic oil required for the piercing operation is controlled by two normally closed solenoid valves, the piercing hydraulic oil when the cutter head extends, and the reset hydraulic oil when anchoring and the cutter head returns to its original position is controlled by a normally open solenoid valve.

[0058] In summary, in this scheme, the hydraulic oil entering through the inlet reaches the main oil passage 11 via the process hole. A first safety valve 2 is installed on the main oil passage 11 to control the maximum hydraulic pressure of the valve group module. The first solenoid valve 5 allows the hydraulic oil from the main oil passage 11 to enter the cutter head oil passage 12 or the oil tank. The second solenoid valve 6 allows the hydraulic oil to enter the anchoring and cutter head retraction oil passages or the oil tank. The main oil passage 11 reaches the third solenoid valve 7 after passing through a check valve 8. The third solenoid valve 7 can control the hydraulic oil to enter the anchoring oil passage 13 or the oil tank. The reason for setting a check valve 8 at the front end of the third solenoid valve 7 is to ensure that the hydraulic oil in the anchoring oil passage will not leak pressure due to various reasons during the drilling operation, which would cause the anchoring to loosen. The hydraulic oil controlled by the first solenoid valve 5 flows to the cutter head extension oil passage connector, and on this oil passage, respectively... A safety valve controlling the feed pressure of the cutter head and a first pressure sensor 91 monitoring the oil circuit pressure are provided. Hydraulic oil controlled by the third solenoid valve 7 flows to the oil circuit connector where the anchor arm extends. A safety valve controlling the anchoring pressure and a second pressure sensor 92 monitoring the oil circuit pressure are respectively provided on this oil circuit. Hydraulic oil controlled by the second solenoid valve 6 flows to the reset oil circuit connector. The reset oil circuit is simultaneously connected to the cutter head recovery chamber and the anchor arm recovery chamber. No safety valve or pressure sensor is required on this oil circuit because the recovery pressure does not need to be monitored. The maximum recovery pressure is consistent with the pressure of the main oil circuit port 11. To ensure the reliable operation of the valve module downhole, all the above components are sealed and protected by a sealing cover 105 with a sealing ring 104 installed on the mounting body. The multi-pin plug 16 at the lower end of the valve module can be electrically connected to the lower end of the tool.

[0059] This embodiment also provides a hydraulic sub-section, including: The aforementioned hydraulic valve assembly; An oil pumping mechanism is provided, wherein the oil outlet of the oil pumping mechanism is connected to the main oil passage of the hydraulic valve group, and is used to inject high-pressure oil into the main oil passage.

[0060] This embodiment also provides a downhole tubing perforation device, the device comprising: The aforementioned hydraulic sub-section; The moving section is detachably connected to the hydraulic section. The moving section is provided with a cutter head mechanism and an anchoring mechanism. The hydraulic piston of the cutter head mechanism is connected to the cutter head oil passage of the hydraulic valve group, and the hydraulic piston of the anchoring mechanism is connected to the anchoring oil passage of the hydraulic valve group.

[0061] This embodiment also provides a control method for a downhole tubing perforation device, such as... Figure 5 As shown, the method includes: Confirmation that the drilling start command has been received; The oil pump injection mechanism is controlled to inject high-pressure oil into the main oil passage hole. At the same time, the third solenoid valve is energized to open the anchoring oil passage hole, thereby controlling the anchoring rod of the anchoring mechanism to extend. Once the command to extend the anchor rod into position is received, the first solenoid valve is energized to open the cutter head oil passage, thereby controlling the extension of the cutter head mechanism.

[0062] Furthermore, such as Figure 6 As shown, the method further includes: Confirmation that the punching completion command has been received; The first solenoid valve is de-energized to reverse the direction of the oil in the cutter head oil passage, thereby controlling the retraction of the cutter head mechanism. Once the command to retract the anchor rod into position is received, the third solenoid valve is de-energized to reverse the direction of the oil in the anchoring oil passage, thereby controlling the retraction of the anchor rod of the anchoring mechanism.

[0063] Specifically, in such Figure 4 Based on the hydraulic circuit shown, when a drilling start command is received, the anchor arm needs to be opened, the third solenoid valve 7 is energized, and the second solenoid valve 6 is de-energized, forming a circulating oil circuit (this circulating oil circuit passes sequentially through the first safety valve 2, check valve 8, third solenoid valve 7, first pressure sensor 91, second safety valve 3, anchoring mechanism, and second solenoid valve 6, at which time the anchor arm will be opened, where the maximum opening pressure is controlled by the second safety valve 3 and monitored by the first pressure sensor 91).

[0064] When the anchor rod is received and the piercing cutter head needs to extend, the first solenoid valve 5 is energized and the second solenoid valve 6 is de-energized, forming a circulating oil circuit (this circulating oil circuit passes sequentially through the first safety valve 2, the first solenoid valve 5, the second pressure sensor 92, the third safety valve 4, the cutter head mechanism, and the second solenoid valve 6, and the cutter head will extend. The maximum opening pressure is controlled by the third safety valve 4 and monitored by the second pressure sensor 92).

[0065] Upon receiving the drilling completion command, when the anchor rod and cutter head need to be retracted, all solenoid valves are de-energized, forming two circulating oil circuits (Circulating oil circuit 1: first safety valve 2, second solenoid valve 6, drilling mechanism, third safety valve 4, second pressure sensor 92, first solenoid valve 5, oil tank; Circulating oil circuit 2: first safety valve 2, second solenoid valve 6, anchoring mechanism, second safety valve 3, first pressure sensor 91, third solenoid valve 7, oil tank). The cutter head and anchor arm will be retracted.

[0066] When the piercing tool is de-energized, all solenoid valves lose power, forming two circulating oil circuits (circulating oil circuit 1: first safety valve 2, second solenoid valve 6, piercing mechanism, third safety valve 4, second pressure sensor 92, first solenoid valve 5, oil tank; circulating oil circuit 2: first safety valve 2, second solenoid valve 6, anchoring mechanism, second safety valve 3, first pressure sensor 91, third solenoid valve 7, oil tank), the cutting head automatically retracts, and the anchoring arm also automatically retracts.

[0067] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention.

[0068] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a microcontroller, chip, or processor to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0069] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details described above. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not describe the various possible combinations separately. Furthermore, various different implementations of the present invention can be combined arbitrarily, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed in the present invention.

Claims

1. A hydraulic valve group, characterized in that, The hydraulic valve assembly includes: The mounting body (1) has a main oil passage hole (11), a cutter head oil passage hole (12), an anchoring oil passage hole (13), a recovery oil passage hole (14), and two oil and wire passage holes (15) along its length. The mounting body (1) is equipped with a first safety valve (2), a second safety valve (3), a third safety valve (4), a first solenoid valve (5), a second solenoid valve (6), a third solenoid valve (7), and a check valve (8). The oil inlet of the first safety valve (2) is connected to the main oil passage hole (11), the oil inlet of the second safety valve (3) is connected to the cutter head oil passage hole (12), the oil inlet of the third safety valve (4) is connected to the anchoring oil passage hole (13), and the oil outlets of the first safety valve (2), the second safety valve (3) and the third safety valve (4) are connected to the corresponding oil passage hole (15). The oil inlet of the first solenoid valve (5), the oil inlet of the second solenoid valve (6) and the oil inlet of the check valve (8) are all connected to the main oil passage (11), and the oil outlet of the check valve (8) is connected to the oil inlet of the third solenoid valve (7). The oil outlet of the first solenoid valve (5) is connected to the oil passage hole (12) of the cutter head; The oil outlet of the third solenoid valve (7) is connected to the anchoring oil passage (13); The oil outlet of the second solenoid valve (6) is connected to the recovery oil passage (14).

2. The hydraulic valve group according to claim 1, characterized in that The diameter of the oil passage hole (15) is larger than the diameter of the cutter head oil passage hole (12), the anchoring oil passage hole (13), and the recovery oil passage hole (14).

3. The hydraulic valve group according to claim 1, characterized in that The second safety valve (3) and the third safety valve (4) are disposed at an angle relative to each other on the mounting body (1).

4. The hydraulic valve assembly according to claim 1, characterized in that, At least one end of the mounting body (1) is provided with a multi-core plug (16) and three oil passage connectors (17). The cutter head oil passage (12), the anchoring oil passage (13), and the recovery oil passage (14) are respectively connected to a corresponding oil passage connector (17) through a corresponding position distribution adjustment oil passage (101).

5. The hydraulic valve assembly according to claim 4, characterized in that, The end of the mounting body (1) is provided with an inner groove (102), and the multi-core plug (16) and the oil passage connector (17) are both located in the inner groove (102).

6. The hydraulic valve assembly according to claim 4, characterized in that, Both the multi-core plug (16) and the oil passage connector (17) are provided with a connector cover (161) that can be removed by means of threaded connection.

7. The hydraulic valve assembly according to claim 1, characterized in that, The first safety valve (2), the second safety valve (3), the third safety valve (4), the first solenoid valve (5), the second solenoid valve (6), the third solenoid valve (7), and the one-way valve (8) are all located between the two oil passage holes (15).

8. The hydraulic valve assembly according to claim 1, characterized in that, The hydraulic valve assembly also includes: A first pressure sensor (91) and a second pressure sensor (92) are disposed on the mounting body (1) for detecting oil circuit pressure; the first pressure sensor (91) is connected to the cutter head oil circuit hole (12); the second pressure sensor (92) is connected to the anchoring oil circuit hole (13).

9. The hydraulic valve assembly according to claim 8, characterized in that, The first safety valve (2), the first solenoid valve (5), the second solenoid valve (6), the one-way valve (8), the third solenoid valve (7), the second pressure sensor (92), the first pressure sensor (91), the second safety valve (3) and the third safety valve (4) are arranged sequentially on the mounting body (1) along the length direction of the mounting body (1).

10. The hydraulic valve assembly according to claim 8, characterized in that, The mounting body (1) is provided with a plurality of mounting holes (103). The first safety valve (2), the first solenoid valve (5), the second solenoid valve (6), the one-way valve (8), the third solenoid valve (7), the first pressure sensor (91), the second pressure sensor (92), the second safety valve (3) and the third safety valve (4) are disposed in a corresponding mounting hole (103), and each mounting hole (103) is provided with a sealing ring (104) and a sealing cap (105).

11. The hydraulic valve assembly according to claim 1, characterized in that, The first solenoid valve (5) and the third solenoid valve (7) are normally closed solenoid valves, and the second solenoid valve (6) is a normally open solenoid valve.

12. A hydraulic sub-joint, characterized in that, include: The hydraulic valve assembly according to any one of claims 1-11; An oil pumping mechanism is provided, wherein the oil outlet of the oil pumping mechanism is connected to the main oil passage of the hydraulic valve group, and is used to inject high-pressure oil into the main oil passage.

13. A downhole tubing perforation device, characterized in that, The device includes: The hydraulic sub-section as claimed in claim 12; The moving section is detachably connected to the hydraulic section. The moving section is provided with a cutter head mechanism and an anchoring mechanism. The hydraulic piston of the cutter head mechanism is connected to the cutter head oil passage of the hydraulic valve group, and the hydraulic piston of the anchoring mechanism is connected to the anchoring oil passage of the hydraulic valve group.

14. A control method for a downhole tubing perforation device, characterized in that, The method includes: Upon receiving the drilling start command, the system controls the oil pump injection mechanism to inject high-pressure oil into the main oil passage hole. Simultaneously, the system energizes the third solenoid valve to open the anchoring oil passage hole, thereby controlling the anchoring rod of the anchoring mechanism to extend. Once the command to extend the anchor rod into position is received, the first solenoid valve is energized to open the cutter head oil passage, thereby controlling the extension of the cutter head mechanism.

15. The control method for the downhole tubing perforation device according to claim 14, characterized in that, The method further includes: Once the drilling completion command is received, the first solenoid valve is de-energized to reverse the direction of the oil in the cutter head oil passage, thereby controlling the cutter head mechanism to retract. Once the command to retract the anchor rod into position is received, the third solenoid valve is de-energized to reverse the direction of the oil in the anchoring oil passage, thereby controlling the retraction of the anchor rod of the anchoring mechanism.

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