Low-permeability coal seam hydraulic directional drilling and protection integrated system and method

Abstract

The application discloses a low-permeability coal seam hydraulic directional drilling and protection integrated system and method, and the device comprises an open-closed directional drilling head, a hollow screw motor short section, a hydraulic punching control short section, a hollow non-magnetic short section, a hollow measuring short section, a hollow cable-free non-magnetic short section and a hollow cable drilling rod short section; the hydraulic punching control short section comprises a rear connector, a control pipe with a center through hole and a front connector; the control pipe is provided with a first end cover capable of being inserted and matched with the front connector for limiting, and the inside of the front connector is provided with a first limiting cavity capable of being inserted and matched with a fixed section; a plurality of first flow holes are formed in the side wall of the front part of the control pipe; a plurality of jet holes are formed in the side wall of the front connector in a circumferential direction; when the front connector is completely inserted and matched with the first end cover, the first flow holes and the jet holes are communicated to form a punching channel; and when the front connector is completely separated from the first end cover, the first flow holes and the first limiting cavity are communicated to form a punching channel.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of underground coal mine drilling and relates to a low-permeability coal seam hydraulic directional drilling, punching and protection integrated system and method. BACKGROUND

[0002] Hydraulic punching is a common pressure relief, permeability enhancement and enhanced extraction measure, which expands the diameter of the drilling hole to increase the permeability of the coal seam and improve the gas extraction effect. However, an excessively large punching radius will cause poor stability of the hole wall, resulting in hole collapse and blocked gas channels, and ultimately leading to a decrease in the gas extraction amount of the drilling hole. To solve the problem of drilling hole collapse and blocked gas channels, the full-hole-section screen pipe hole protection technology has been formed in long-term drilling practice. The inner through hole of the "open-close type drill bit + hollow drill rod" is used as a screen pipe lowering channel, and the screen pipe is lowered to the actual hole depth position. After the drill rod is pulled out, the screen pipe remains in the hole to ensure smooth gas channels. In recent years, due to the controllable drilling trajectory, high utilization rate and large hole depth of the directional drilling technology with the measurement while drilling (MWD) in the coal mine, the application scenarios of the directional drilling technology have been continuously enriched. However, the central channel of the screw motor, the probe pipe and the through-cable drill rod matched with the directional drilling technology with the measurement while drilling under the existing technical conditions are occupied by special devices, and the screen pipe cannot be directly lowered in the inner hole of the above-mentioned drilling tools. That is, after the directional hole drilling and punching are completed, the channel is blocked and the screen pipe cannot be efficiently lowered in the full hole section. To prevent drilling hole collapse and blockage of the gas extraction channel, the screen pipe is usually lowered in the following two ways for hole protection: (1) bare hole lowering, that is, after the directional drilling is completed, the drill rod is pulled out, and the screen pipe is lowered in the bare hole. The defect is that the screen pipe lowering depth cannot be guaranteed due to local hole section collapse, thereby affecting the gas extraction effect; (2) hole sweeping drilling tool lowering, that is, after the directional drilling is completed, the drill rod is pulled out, and the "open-close type drill bit + hollow drill rod" drilling tool combination is lowered to the hole bottom for hole sweeping, and then the screen pipe is lowered through the inner hole of the drilling tool. The defect is that new holes are easily drilled during the hole sweeping process, resulting in that the screen pipe lowered through the inner hole of the hole sweeping drilling tool does not enter the original drilling hole, thereby affecting the gas extraction effect. The use of the uphole and downhole hole sweeping drilling tools increases the labor intensity of workers and reduces the construction efficiency. The through-cable drilling tool for the directional drilling with the measurement while drilling and the hole sweeping drilling tool for lowering the screen pipe need to be configured at the construction site, thereby increasing the coal mine material procurement cost and the space for storing the drilling tools. SUMMARY

[0003] To solve the problems in the prior art, the purpose of the present application is to provide a low-permeability coal seam hydraulic directional drilling, punching and protection integrated system and method to solve the technical problems of complex construction process and low production efficiency caused by the need for distributed completion of low-permeability coal seam hydraulic directional drilling, punching and protection in the prior art.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0005] The low-permeability coal seam hydraulic directional drilling and protection integrated system comprises an open-closed directional drilling head, a hollow screw motor short section, a hydraulic punching control short section, a hollow non-magnetic short section, a hollow measuring short section, a hollow cable-free non-magnetic short section and a hollow cable drilling rod short section arranged in sequence from front to back.

[0006] The internal passages of the hydraulic punching control short section, the hollow non-magnetic short section, the hollow measuring short section, the hollow cable-free non-magnetic short section and the hollow cable drilling rod short section are communicated to form an equal-diameter continuous passage.

[0007] The hydraulic punching control short section comprises a rear adapter, a control pipe with a central through hole and a front adapter, the rear adapter is coaxially communicated with the front adapter, the control pipe is arranged in the front adapter, the rear end of the control pipe extends into the rear adapter, and the front end of the control pipe extends out of the front adapter, and a sheath is further sleeved on the outer surfaces of the front adapter and the rear adapter.

[0008] The front end of the control pipe is provided with a first end cover capable of limiting the insertion fitting of the front adapter, the first end cover comprises a cylindrical fixed section and a first end plate arranged at the front end of the fixed section.

[0009] The inner front end of the front adapter is provided with a first limiting cavity capable of being inserted and fitted with the fixed section, and the front end of the first limiting cavity is open.

[0010] A plurality of first flow holes are circumferentially and equally spaced on the front part of the side wall of the control pipe, and a plurality of through jet holes are circumferentially and equally spaced on the side wall of the front adapter.

[0011] When the front adapter is completely inserted and fitted with the fixed section, the first flow hole and the jet hole are communicated to form a water flow channel, and when the front adapter is completely separated from the fixed section, the first flow hole and the first limiting cavity are communicated to form a punching channel.

[0012] The present application also has the following technical features:

[0013] Specifically, the hollow screw motor short section comprises a screw motor outer pipe, and a connecting mechanism, a rotor, a universal shaft and a transmission shaft are sequentially and communicatively arranged in the screw motor outer pipe from back to front.

[0014] The connecting mechanism comprises a first connecting section and a second connecting section arranged in connection, and the rear end of the first connecting section extends into the second connecting section.

[0015] A plurality of second flow holes capable of being communicated with the first flow holes are circumferentially arranged on the second connecting section.

[0016] Furthermore, the connecting mechanism further comprises a second end plate radially arranged between the first connecting section and the second connecting section.

[0017] The first limiting step is arranged in the second connecting section and used for limiting the second end plate; the front end surface of the second end plate is abutted with the front end surface of the first connecting section, and the rear end surface of the second end plate is abutted with the first limiting step.

[0018] Further, the connecting mechanism further comprises a second end plate arranged between the first connecting section and the second connecting section in the radial direction, and the rear surface of the second end plate is capable of being attached with the front surface of the first end cover.

[0019] Further, the rear end of the hollow cable drill rod short section is connected with a cable water feeder; the first end cover and the second end plate are both made of glass plate.

[0020] Further, the hollow measurement short section comprises a measurement short section outer pipe and a measurement short section inner pipe coaxially sleeved, a plurality of annular mounting grooves are arranged on the outer wall of the measurement short section inner pipe in the axial direction, and a first vibration isolation ring, a power module, a transmission module, a temperature sensor module, an acceleration sensor module, a magnetic sensor module, a formation identification module, a microcontroller module, a storage module and a second vibration isolation ring are respectively arranged in the annular mounting grooves; the power module is connected with the remaining modules respectively and used for supplying power to the modules;

[0021] The first vibration isolation ring and the second vibration isolation ring are used for isolating external vibration;

[0022] The transmission module is connected with an external control system and used for transmitting data detected by the hollow measurement short section to the external control system.

[0023] Further, a first cable passing channel is formed between the measurement short section outer pipe and the measurement short section inner pipe; the hollow cable non-magnetic short section comprises a non-magnetic rod body and a first central pipe coaxially sleeved on the non-magnetic rod body, and a second cable passing channel is formed between the non-magnetic rod body and the first central pipe.

[0024] The hollow cable drill rod short section comprises a magnetic rod body and a second central pipe coaxially sleeved in the magnetic rod body, and a third cable passing channel is formed between the magnetic rod body and the second central pipe.

[0025] The cable passing in the first cable passing channel, the second cable passing channel and the third cable passing channel, and the two ends of the cable passing in the second cable passing channel and the third cable passing channel are respectively connected with the conductive column assembly and the conductive ring assembly, and the rear end of the cable passing in the first cable passing channel is connected with the conductive column assembly; the front end of the cable passing in the third cable passing channel is connected with the conductive column assembly arranged in the cable water feeder.

[0026] The conductive column assembly and the conductive ring assembly are capable of being electrically connected.

[0027] Further, the conductive column assembly comprises an insulating column body, the insulating column body comprises an insulating column connecting section and an insulating column mounting section which are integrally connected, a circumferential sealing groove is arranged on the outer wall of the side of the insulating column connecting section close to the insulating column mounting section, and an elastic gasket is embedded in the circumferential sealing groove; and a plurality of elastic conductive ring petals are arranged on the outer wall of the elastic gasket in a circumferential direction.

[0028] The cable is connected with the elastic conductive ring petals.

[0029] Further, the conductive ring assembly comprises an insulating sleeve body, the space in the insulating sleeve body is sequentially the inner tube mounting cavity, the first transition cavity, the second transition cavity and the conductive ring mounting cavity from back to front, and the conductive ring is arranged in the conductive ring mounting cavity.

[0030] A first containing cavity is arranged on the side wall of the insulating sleeve body in an axial direction, the front end of the first containing cavity is closed and the rear end is open, and a cable passing through the first containing cavity is connected with the conductive ring.

[0031] Further, a plurality of elastic conductive ring petal mounting grooves are arranged on the outer wall of the elastic gasket in a circumferential direction, and the elastic conductive ring petals are embedded in the elastic conductive ring petal mounting grooves.

[0032] The number of the elastic conductive ring petals is three, and the three elastic conductive ring petals are arranged on the outer wall of the elastic gasket in a circumferential direction at equal intervals.

[0033] The number of the elastic conductive ring petal mounting grooves is three, and the three elastic conductive ring petal mounting grooves are arranged on the elastic gasket in a circumferential direction at equal intervals.

[0034] The application also protects a low-permeability coal seam hydraulic directional drilling and protection integrated method, which is realized by the low-permeability coal seam hydraulic directional drilling and protection integrated system and comprises the following steps.

[0035] Step 1, determining a drilling trajectory of directional drilling according to early exploration data, wherein the drilling trajectory comprises a plurality of preset punching points.

[0036] Step 2, drilling and constructing to a first punching point according to the determined drilling trajectory, and recording the mud pump pressure.

[0037] Step 3, performing a hydraulic punching operation at the first punching point.

[0038] Step 4, after the hydraulic punching operation is completed, lowering a drill tool, and then a front hand completely cooperates with a rear hand under the action of a thrust force, drilling and constructing to a second punching point according to the determined drilling trajectory, and recording the mud pump pressure.

[0039] Step 5, repeating steps 3 and 4 to complete the hydraulic punching of all preset punching points and drill to a target hole depth.

[0040] Step 6, after washing the hole, stop the mud pump, lift the drilling tool away from the hole bottom, and then remove the cable water feeder;

[0041] Step 7, send the screen pipe into the hollow cable drill rod nipple, when the screen pipe reaches the first end plate and the second end plate, break the first end plate and the second end plate by instantaneous impact, make the internal passages of the hollow screw motor nipple and the hydraulic punching control nipple communicate, and then lower the screen pipe to the hole bottom;

[0042] Step 8, lift the drilling tool out of the hole;

[0043] Step 9, seal the hole and extract.

[0044] Compared with the prior art, the present application has the following technical effects:

[0045] (1) The system solves the problem that the screen pipe cannot be lowered to the original hole depth in the step-by-step construction of the low-permeability coal seam directional hole drilling, punching and protection under the prior art conditions, realizes the one-trip drilling operation of the low-permeability coal seam hydraulic directional drilling, punching and protection, ensures the screen pipe protection of the whole hole section, simplifies the operation process, improves the construction efficiency, and improves the low-permeability coal seam gas extraction effect.

[0046] (2) The system can provide a transmission channel for the information collected by the while-drilling directional drilling process, and can also provide a smooth physical channel for the screen pipe lowering of the screen pipe hole completion process by means of the equal-diameter central tube, so as to ensure that the while-drilling directional drilling and screen pipe hole completion can be realized by using a set of drilling tools, improve the production efficiency, and reduce the material purchase cost and labor intensity of workers. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 is a drilling state connection diagram of the low-permeability coal seam hydraulic directional drilling, punching and protection integrated system;

[0048] Figure 2 is a screen pipe lowering state connection diagram of the low-permeability coal seam hydraulic directional drilling, punching and protection integrated system;

[0049] Figure 3 is a hydraulic punching control nipple drilling state diagram;

[0050] Figure 4 is a hydraulic punching control nipple punching state diagram;

[0051] Figure 5 is a hollow screw motor nipple structure diagram;

[0052] Figure 6 is a connection mechanism structure diagram;

[0053] Figure 7 is a schematic diagram of a hollow measuring short section structure;

[0054] Figure 8 is a schematic diagram of a hollow cable drill pipe short section structure;

[0055] Figure 9 is a schematic diagram of a hollow cable non-magnetic short section structure;

[0056] Figure 10 is a schematic diagram of a conductive ring assembly structure;

[0057] Figure 11 is a schematic diagram of a conductive column assembly structure;

[0058] Figure 12 is a schematic diagram of an elastic gasket and elastic conductive ring petal assembly.

[0059] The various reference numbers in the figure represent:

[0060] 1-Open and closed directional drill bit, 2-Hollow screw motor short section, 3-Hydraulic punching control short section, 4-Hollow non-magnetic short section, 5-Hollow measuring short section, 6-Hollow cable non-magnetic short section, 7-Hollow cable drill pipe short section, 8-Cable water feeder, 9-Conductive column assembly, 10-Conductive ring assembly, I-Screen pipe;

[0061] 21-Screw motor outer tube, 22-Connecting mechanism, 23-Rotor, 24-Universal shaft, 25-Transmission shaft; 221-First connecting section, 222-Second connecting section, 223-Second end plate; 2221-Second flow hole, 2222-First limiting step;

[0062] 31-Back hand, 32-Control tube, 33-Front hand, 34-First end cover, 35-First limiting cavity, 36-Sheath;

[0063] 321-First flow hole; 331-Jet flow hole; 341-Fixed section, 342-First end plate;

[0064] 51-Measuring short section outer tube, 52-Measuring short section inner tube, 53-First vibration isolation ring, 54-Power module, 55-Transmission module, 56-Temperature sensor module, 57-Acceleration sensor module, 58-Magnetic sensor module, 59-Formation identification module, 510-Microcontroller module, 511-Storage module, 512-Second vibration isolation ring;

[0065] 61-Non-magnetic rod body, 62-First central tube;

[0066] 71-Magnetic rod body, 72-Second central tube;

[0067] 91-insulating post body, 92-elastic washer, 93-elastic conductive ring; 911-insulating post connecting section, 912-insulating post mounting section;

[0068] 101-insulating sleeve body, 102-conductive ring; 1011-inner tube mounting cavity, 1012-first transition cavity, 1013-second transition cavity, 1014-conductive ring mounting cavity, 1015-first accommodating cavity. DETAILED DESCRIPTION

[0069] The specific embodiments of the present application are given below, it should be noted that the present application is not limited to the following specific embodiments, any equivalent transformation made on the basis of the technical scheme of the present application falls within the protection scope of the present application.

[0070] It should be noted that when the present application is described in terms of orientation, the terms "upper", "lower", "top", "bottom", etc. indicate the orientation or positional relationship only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation. "Inner" and "outer" refer to the inner core and outer contour of the corresponding components. The above terms should not be understood as limiting the present application. If the specific posture changes, the directional indication will also change accordingly. In addition, the description of "first", "second", etc. in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the technical features indicated or implying the number of technical features indicated. Therefore, the features limited by "first" and "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, unless otherwise specifically limited. In the present application, unless otherwise specifically defined and limited, the terms "connection", "fixation" and the like should be understood broadly, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0071] In the present application, unless otherwise specified, the components used, such as cables, center tubes, rod bodies, open-close directional drill bits, etc. are all existing components in the art.

[0072] Example 1

[0073] According to the above technical scheme, such as Figure 1 and Figure 2As shown in the drawings, the low-permeability coal seam hydraulic directional drilling and protection integrated system comprises, in sequence from front to back, an open-close directional drilling bit 1, a hollow screw motor short section 2, a hydraulic punching control short section 3, a hollow non-magnetic short section 4, a hollow measuring short section 5, a hollow cable-free non-magnetic short section 6, and a hollow cable drilling rod short section 7.

[0074] The internal passages of the hydraulic punching control short section 3, the hollow non-magnetic short section 4, the hollow measuring short section 5, the hollow cable-free non-magnetic short section 6, and the hollow cable drilling rod short section 7 are communicated to form an equal-diameter continuous passage, and the equal-diameter continuous passage can ensure that no blockage is formed to the screen pipe or other components entering the central pipe, and the equal-diameter continuous passage is communicated with the internal passage of the hollow screw motor short section 2 and the internal passage of the open-close directional drilling bit 1.

[0075] As shown in the drawings, Figure 3 and Figure 4 The hydraulic punching control short section 3 comprises a rear joint 31, a control pipe 32 with a central through hole, and a front joint 33. The rear joint 31 is coaxially communicated with the front joint 33, the control pipe 32 is arranged in the front joint 33, and the rear end of the control pipe 32 extends into the rear joint 31 and the front end extends out of the front joint 33. A sheath 36 is further sleeved on the outer wall of the front joint 33 and the rear joint 31. In this embodiment, the front joint 31 and the rear joint 33 are connected by a multi-prism plug-in fit, and can move relative to each other under the action of the axial direction. A sealing ring is arranged between the inner wall of the sheath 36 and the outer wall of the front joint 33 and the outer wall of the rear joint 31 to ensure that no foreign matter enters the space formed after the relative movement of the front joint 33 and the rear joint 31.

[0076] The front end of the control pipe 32 is provided with a first end cover 34 capable of limiting the plug-in fit of the front joint 33. The first end cover 34 comprises a cylindrical fixed section 341 and a first end plate 342 arranged at the front end of the fixed section 341, and the first end cover 342 is used to close the hole in the control pipe 32.

[0077] The inside of the front joint 33 is provided with a first limiting cavity 35 capable of plug-in fit with the fixed section 341, and the front end of the first limiting cavity 35 is open. The first limiting cavity 35 can be used as a flow channel for high-pressure flushing liquid, or can be connected with the fixed section 341.

[0078] A plurality of first flow holes 321 are arranged on the front part of the side wall of the control pipe 32 at equal intervals in the circumferential direction. A plurality of jet holes 331 are arranged on the side wall of the front joint 33 at equal intervals in the circumferential direction. As a preferred embodiment, the number of first flow holes 321 is the same as the number of jet holes 331.

[0079] When the front connector 33 is fully inserted into the first end cover 34 under the pulling force, the front connector 33 and the rear connector 3 are relatively moved to be separated, the first flow hole 321 and the jet flow hole 331 are communicated to form a water passage, and water flows through the water passage during drilling; when the front connector 33 is completely separated from the first end cover 34, the front connector 33 and the rear connector 3 are relatively moved to be completely matched, the first flow hole 321 and the first limiting cavity 35 are communicated to form a punching passage, and the high-pressure flushing liquid can flow out through the punching passage to implement punching.

[0080] As a preferred scheme of the embodiment, as shown in Figure 5 The hollow screw motor sub 2 includes a screw motor outer pipe 21, and the connection mechanism 22, the rotor 23, the universal shaft 24 and the transmission shaft 25 are sequentially and communicatively arranged in the screw motor outer pipe 21 from back to front; wherein the connection mechanism 22, the rotor 23, the universal shaft 24 and the transmission shaft 25 are all hollow structures, and the interiors are formed into liquid flow channels after being communicated, and the outer shell of the universal shaft 24 has an angle of 0-3°.

[0081] As a preferred scheme of the embodiment, the connection mechanism 22 includes a first connection section 221 and a second connection section 222 which are connected, and the rear end of the first connection section 221 extends into the second connection section 222;

[0082] A plurality of second flow holes 2221 which can be communicated with the first flow hole 321 are circumferentially arranged on the second connection section 222. The number of the second flow holes 2221 is the same as that of the first flow hole 321.

[0083] As a preferred scheme of the embodiment, as shown in Figure 6 The connection mechanism 22 further includes a second end plate 223 which is radially arranged between the first connection section 221 and the second connection section 222; and the second end plate 223 is used for plugging the inner hole of the connection mechanism 22.

[0084] The first limiting step 2222 for limiting the second end plate 223 is arranged in the second connection section 222; the front end surface of the second end plate 223 abuts against the front end surface of the first connection section 221, and the rear end surface of the second end plate 223 abuts against the first limiting step 2222. The first limiting step 2222 and the first connection section 221 cooperatively realize clamping and fixing of the second end plate 223.

[0085] As a preferred scheme of the embodiment, the rear end of the hollow cable drill pipe sub 7 is connected with a cable water feeder 8; the cable water feeder 8 is used for providing high-pressure flushing liquid; the first end cover 34 and the second end plate 223 are both made of glass plate material and can be broken under instantaneous impact.

[0086] As a preferred scheme of the embodiment, as shown in Figure 7As shown, the hollow measuring short section 5 comprises a measuring short section outer pipe 51 and a measuring short section inner pipe 52 coaxially sleeved, an equal-diameter flow passage is arranged in the measuring short section inner pipe 52, a plurality of annular mounting grooves are arranged on the outer wall of the measuring short section inner pipe 52 in the axial direction, and a first vibration isolation ring 53, a power module 54, a transmission module 55, a temperature sensor module 56, an acceleration sensor module 57, a magnetic sensor module 58, a formation identification module 59, a microcontroller module 510, a storage module 511 and a second vibration isolation ring 512 are respectively arranged in the annular mounting grooves;

[0087] The power module 504 is connected with the above-mentioned remaining modules respectively, and is used for supplying power for the above-mentioned modules;

[0088] The first vibration isolation ring 503 and the second vibration isolation ring 512 are used for isolating external vibration, and improving the measurement accuracy of the hollow measuring short section 7;

[0089] The transmission module 505 is connected with an external control system, and is used for transmitting the data detected by the hollow measuring short section 5 to the external control system.

[0090] It should be noted that those skilled in the art have the ability to select appropriate devices for corresponding modules in combination with professional knowledge, and the external control system is installed with an existing control program and can receive and process the collected data.

[0091] As a preferred scheme of the embodiment, a first cable passing channel is formed between the measuring short section outer pipe 51 and the measuring short section inner pipe 52; the hollow cable measuring short section 6 comprises a non-magnetic rod body 61 and a first center pipe 62 coaxially sleeved on the non-magnetic rod body 61, and a second cable passing channel is formed between the non-magnetic rod body 61 and the first center pipe 62;

[0092] As shown in the figure, Figure 8 The hollow cable measuring short section 7 comprises a magnetic rod body 71 and a second center pipe 72 coaxially sleeved in the magnetic rod body 71, and a third cable passing channel is formed between the magnetic rod body 71 and the second center pipe 72;

[0093] As shown in the figure, Figure 9 The overall structure of the hollow cable measuring short section 6 is the same as that of the hollow cable measuring short section 7, and the difference is only that the material of the inner pipe and the outer pipe of the hollow cable measuring short section 6 is non-magnetic material.

[0094] The first cable passing channel, the second cable passing channel and the third cable passing channel are communicated, and a cable is arranged in each of the first cable passing channel, the second cable passing channel and the third cable passing channel; the two ends of the cable arranged in the second cable passing channel and the third cable passing channel are respectively connected with the conductive column assembly 9 and the conductive ring assembly 10, and the rear end of the cable arranged in the first cable passing channel is connected with the conductive column assembly 9;

[0095] The adjacent conductive column assembly 9 and the conductive ring assembly 10 can be electrically connected, that is, the conductive column assembly 9 connected with the cable in the first cable passage can be electrically connected with the conductive ring assembly 10 in the non-magnetic rod body; the conductive column assembly 9 in the non-magnetic rod body is electrically connected with the conductive ring assembly 10 in the magnetic rod body 71, and the conductive column assembly in the magnetic rod body 71 can be matched with the conductive ring assembly 10 arranged at the front end of the cable water feeder 8, so that a complete electrical signal transmission path is formed, and the electrical signal transmission of adjacent short sections is realized.

[0096] As a preferred scheme of the embodiment, as shown in Figure 11 The conductive column assembly 9 comprises an insulating column body 91, the insulating column body 91 comprises an insulating column connecting section 911 and an insulating column mounting section 912 which are integrally connected, a circumferential sealing groove is formed on the outer wall of the side of the insulating column connecting section 911 close to the insulating column mounting section 912, an elastic gasket 92 is embedded in the circumferential sealing groove, and a plurality of elastic conductive ring petals 93 are arranged on the outer wall of the elastic gasket 92 in a circumferential direction.

[0097] The cable is connected with the elastic conductive ring petals 93.

[0098] As a preferred scheme of the embodiment, as shown in Figure 10 The conductive ring assembly 10 comprises an insulating sleeve body 101, the space in the insulating sleeve body 101 is sequentially an inner tube mounting cavity 1011, a first transition cavity 1012, a second transition cavity 1013 and a conductive ring mounting cavity 1014 from back to front, wherein the inner tube mounting cavity 1011 and the first transition cavity 1012 are both cylindrical cavities, the inner diameter of the inner tube mounting cavity 1011 is smaller than that of the first transition cavity 1012, the second transition cavity 1013 is a stepped shape, the small-diameter end of the second transition cavity 1013 is connected with the first transition cavity 1012, the large-diameter end of the second transition cavity 1013 is connected with the conductive ring mounting cavity 1014, and the inner diameter of the conductive ring mounting cavity 1014 is larger than that of the large-diameter end of the second transition cavity 1013; the conductive ring mounting cavity 714 is provided with a conductive ring 102; the conductive ring mounting cavity 1014 is provided with a conductive ring 102, and the outer wall of the conductive ring 102 is arranged in close contact with the inner wall of the conductive ring mounting cavity 1014.

[0099] A first containing cavity 1015 is formed on the side wall of the insulating sleeve body 101 in an axial direction, the front end of the first containing cavity 1015 is closed and the rear end is open, and the cable passing through the first containing cavity 1015 is connected with the conductive ring 102.

[0100] As a preferred scheme of the embodiment, as shown in Figure 12 A plurality of elastic conductive ring petal mounting grooves are arranged on the outer wall of the elastic gasket 92 in a circumferential direction, and the elastic conductive ring petals 93 are embedded in the elastic conductive ring petal mounting grooves;

[0101] The number of the elastic conductive ring petals 93 is three, and the three elastic conductive ring petals 93 are arranged equidistantly along the outer wall of the elastic gasket 92; the number of the elastic conductive ring petal mounting grooves is three, and the three elastic conductive ring petal mounting grooves are arranged equidistantly along the outer wall of the elastic gasket 92. In the free state, the outer edge of the elastic conductive ring petal 93 corresponds to a circle with a diameter slightly larger than the inner diameter of the conductive ring 102, and preferably, the outer edge of the elastic conductive ring petal 93 corresponds to a circle with a diameter 0.2-0.3 mm larger than the inner diameter of the conductive ring 102, so as to ensure that the conductive ring assembly 10 and the conductive column assembly 9 are inserted and matched, and the conductive ring 102 can be in compact contact with the elastic conductive ring petal 63.

[0102] The top surface of the elastic conductive ring petal 93 protrudes from the plane where the groove opening of the elastic conductive ring petal mounting groove is located, so as to ensure that the top surface of the elastic conductive ring petal 93 can be in contact with the conductive ring 102, and the transmission of electrical signals is realized.

[0103] Embodiment 2

[0104] The embodiment provides a low-permeability coal seam hydraulic directional drilling and protection integrated method, which is realized by the low-permeability coal seam hydraulic directional drilling and protection integrated system provided in Embodiment 1, and includes the following steps.

[0105] Step 1: determining a drilling trajectory of the directional drilling according to early exploration data (coal mine gas prevention and control requirements and stratum conditions), wherein the drilling trajectory includes a plurality of preset punching points.

[0106] Opening, constructing a hole mouth casing section according to design requirements; putting forward an opening drilling tool, lowering the casing, and injecting a sealing material into the annulus between the casing and the drilling hole wall to seal the casing, and installing a hole mouth device;

[0107] Low-permeability coal seam hydraulic directional drilling and protection integrated system inspection and debugging: checking whether the opening and closing of the movable blade wing of the opening and closing type directional drilling head 1 is flexible and reliable, checking whether the hollow type screw motor short section 2 is working normally; connecting the hollow type measuring short section 5 with the explosion-proof computer, opening the measuring system software, setting the attitude of the measuring short section such as the inclination angle and the azimuth angle, and checking whether the software display data is accurate; checking whether the equal-diameter continuous through holes formed in the hollow type wired drill pipe 7, the hollow type wired non-magnetic short section 6, the hollow type non-magnetic short section 4 and the hydraulic punching control short section 3 match the screen pipe to be lowered.

[0108] Step 2: drilling directionally according to the determined drilling trajectory to the first punching point, and recording the mud pump pressure.

[0109] Step 3: performing hydraulic punching operation at the first punching point.

[0110] Specifically, the drilling is stopped, the drilling tool is lifted, the rear connector 33 is separated from the front connector 31 under the action of the tension, the first flow hole 321 is in communication with the jet hole 331, and the hydraulic punching is started after the mud pump pressure rises.

[0111] Step 4, after the hydraulic jetting operation is completed, the drilling tool is lowered, the rear adapter is fully matched with the front adapter under the thrust, directional drilling is conducted according to the determined drilling track to the second jetting point, and the mud pump pressure is recorded;

[0112] Step 5, steps 3 and 4 are repeated to complete the hydraulic jetting of all preset jetting points and drilling to the target hole depth;

[0113] Step 6, after the hole is washed, the mud pump is stopped, the drilling tool is lifted away from the hole bottom, and the cable water feeder is removed;

[0114] Step 7, the screen pipe is sent into the inner hole of the hollow cable drill rod short section, when the screen pipe reaches the first end plate and the second end plate, the first end plate and the second end plate are broken by instantaneous impact; the internal passages of the hollow screw motor short section and the hydraulic jetting control short section are communicated; and the screen pipe is lowered to the hole bottom;

[0115] Step 8, the drilling tool is lifted to the outside of the hole;

[0116] Step 9, hole sealing and continuous extraction.

[0117] As described above, the scheme content given in combination with the drawings and examples is only a preferred example of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification made on the basis of the technical essence of the present application to the above examples still belongs to the scope of the technical scheme of the present application.

Claims

1. A low-permeability coal seam hydraulic directional drilling and protection integrated system, characterized in that, The opening and closing directional drill bit (1), the hollow screw motor short section (2), the hydraulic punching control short section (3), the hollow non-magnetic short section (4), the hollow measuring short section (5), the hollow cable non-magnetic short section (6) and the hollow cable drill pipe short section (7) are sequentially connected from front to back; The internal passages of the hydraulic punching control short section (3), the hollow non-magnetic short section (4), the hollow measuring short section (5), the hollow cable non-magnetic short section (6) and the hollow cable drill pipe short section (7) are communicated to form an equal-diameter continuous passage; The hydraulic punching control short section (3) comprises a rear adapter (31), a control pipe (32) with a central through hole and a front adapter (33), the rear adapter (31) is coaxially communicated with the front adapter (33), the control pipe (32) is arranged in the front adapter (33), and the rear end of the control pipe (32) extends into the rear adapter (31) and the front end of the control pipe (32) extends out of the front adapter (33); the front adapter (33) and the rear adapter (31) are further sleeved with a sheath (36); The front end of the control pipe (32) is provided with a first end cover (34) capable of limiting the insertion and fitting of the front adapter (33), the first end cover (34) comprises a cylindrical fixed section (341) and a first end plate (342) arranged at the front end of the fixed section (341); The inside of the front adapter (33) is provided with a first limiting cavity (35) capable of being inserted and fitted with the fixed section (341), and the front end of the first limiting cavity (35) is open; A plurality of first flow holes (321) are equidistantly and circumferentially arranged on the front part of the side wall of the control pipe (32); a plurality of through jet holes (331) are equidistantly and circumferentially arranged on the side wall of the front adapter (33); When the front adapter (33) is completely inserted and fitted with the fixed section (341), the first flow holes (321) and the jet holes (331) are communicated to form a water passage; when the front adapter (33) is completely separated from the fixed section (341), the first flow holes (321) and the first limiting cavity (35) are communicated to form a punching passage.

2. The low-permeability coal seam hydraulic directional drilling and protection integrated system of claim 1, wherein, The hollow screw motor short section (2) comprises a screw motor outer pipe (21), and the screw motor outer pipe (21) is sequentially and communicatively provided with a connecting mechanism (22), a rotor (23), a universal shaft (24) and a transmission shaft (25) from back to front; The connecting mechanism (22) comprises a first connecting section (221) and a second connecting section (222) which are connected, the rear end of the first connecting section (221) extends into the second connecting section (222); A plurality of second flow holes (2221) capable of being communicated with the first flow holes (321) are arranged on the second connecting section (222) in the circumferential direction.

3. The low-permeability coal seam hydraulic directional drilling and protection integrated system of claim 2, wherein, The connecting mechanism (22) further comprises a second end plate (223) arranged in the radial direction between the first connecting section (221) and the second connecting section (222). The second connecting section (222) is provided with a first limiting step (2222) for limiting the second end plate (223); the front end surface of the second end plate (223) is in abutment with the front end surface of the first connecting section (221), and the rear end surface of the second end plate (223) is in abutment with the first limiting step (2222).

4. The low-permeability coal seam hydraulic directional drilling and protection integrated system of claim 1, wherein, The rear end of the hollow cable drill rod short section (7) is connected with a cable water feeder (8); the first end cover (34) and the second end plate (223) are both made of glass plate material.

5. The low-permeability coal seam hydraulic directional drilling and protection integrated system of claim 1, wherein, The hollow measurement short section (5) comprises a measurement short section outer tube (51) and a measurement short section inner tube (52) coaxially sleeved, a plurality of annular mounting grooves are formed on the outer wall of the measurement short section inner tube (52) in the axial direction, and a first vibration isolation ring (53), a power supply module (54), a transmission module (55), a temperature sensor module (56), an acceleration sensor module (57), a magnetic sensor module (58), a formation identification module (59), a microcontroller module (510), a storage module (511) and a second vibration isolation ring (512) are respectively arranged in the annular mounting grooves. The power supply module (54) is connected with the other modules respectively, and is used for supplying power for the modules. The first vibration isolation ring (53) and the second vibration isolation ring (512) are used for isolating external vibration. The transmission module (55) is connected with an external control system, and is used for transmitting data detected by the hollow measurement short section (5) to the external control system.

6. The low-permeability coal seam hydraulic directional drilling and protection integrated system of claim 5, wherein, The measurement short section outer tube (51) and the measurement short section inner tube (52) form a first cable passing channel; the hollow cable non-magnetic short section (6) comprises a non-magnetic rod body (61) and a first center tube (62) coaxially sleeved on the non-magnetic rod body (61), and the non-magnetic rod body (61) and the first center tube (62) form a second cable passing channel; The hollow cable drill rod short section (7) comprises a magnetic rod body (71) and a second center tube (72) coaxially sleeved in the magnetic rod body (71), and the magnetic rod body (71) and the second center tube (72) form a third cable passing channel; The first cable passing channel, the second cable passing channel and the third cable passing channel are all provided with a cable, and the two ends of the cable passing through the second cable passing channel and the third cable passing channel are respectively connected with a conductive column assembly (9) and a conductive ring assembly (10), and the rear end of the cable passing through the first cable passing channel is connected with the conductive column assembly (9). The conductive column assembly (9) and the conductive ring assembly (10) can be electrically connected.

7. The low-permeability coal seam hydraulic directional drilling and protection integrated system of claim 6, wherein, The conductive column assembly (9) comprises an insulating column body (91), the insulating column body (91) comprises an insulating column connecting section (911) and an insulating column mounting section (912) integrally connected, a circumferential sealing groove is formed on the outer wall of the side of the insulating column connecting section (911) close to the insulating column mounting section (912), an elastic gasket (92) is embedded in the circumferential sealing groove, and a plurality of elastic conductive ring petals (93) are arranged on the outer wall of the elastic gasket (92) in the circumferential direction. The cable is connected with the elastic conductive ring petals (93).

8. The low-permeability coal seam hydraulic directional drilling and protection integrated system of claim 7, wherein, The conductive ring assembly (10) comprises an insulating sleeve body (101), and the space in the insulating sleeve body (101) is sequentially provided with an inner tube mounting cavity (1011), a first transition cavity (1012), a second transition cavity (1013) and a conductive ring mounting cavity (1014) from back to front, and the conductive ring mounting cavity (1014) is provided with a conductive ring (102); The first accommodating cavity (1015) is closed at the front end and open at the rear end, and a cable passing device arranged in the first accommodating cavity (1015) is connected with the conductive ring (102).

9. The low-permeability coal seam hydraulic directional drilling and protection integrated system of claim 8, wherein, The elastic conductive ring petals (93) are arranged on the outer wall of the elastic gasket (92) in a plurality of elastic conductive ring petal mounting grooves arranged in a circumferential direction. The number of the elastic conductive ring petals (93) is three, and the three elastic conductive ring petals (93) are arranged in a circumferential direction of the elastic gasket (92) at equal intervals. The number of the elastic conductive ring petal mounting grooves is three, and the three elastic conductive ring petal mounting grooves are arranged in a circumferential direction of the elastic gasket (92) at equal intervals.

10. A low-permeability coal seam hydraulic directional drilling and protection integrated method, characterized in that, The low-permeability coal seam hydraulic directional drilling and protection integrated system is realized by the method according to any one of claims 1-9, and comprises the following steps: Step 1: determining a drilling trajectory of directional drilling according to previous exploration data, wherein the drilling trajectory comprises a plurality of preset punching points; Step 2: drilling according to the determined drilling trajectory to a first punching point, and recording mud pump pressure; Step 3: performing hydraulic punching operation at the first punching point; Step 4: after the hydraulic punching operation is completed, lowering a drilling tool, and then a front connector and a rear connector are completely matched under the action of a pushing force, drilling according to the determined drilling trajectory to a second punching point, and recording mud pump pressure; Step 5: repeating steps 2 and 3 to complete hydraulic punching of all preset punching points and drilling to a target hole depth; Step 6: after hole washing, stopping the mud pump, lifting the drilling tool away from the hole bottom, and then removing the cable water feeder; Step 7: putting the screen pipe into the inner hole of the hollow cable drill rod short section, and when the screen pipe reaches the first end plate and the second end plate, instantaneously impacting to crush the first end plate and the second end plate, so that the internal passages of the hollow screw motor short section and the hydraulic punching control short section are connected, and the screen pipe is lowered to the hole bottom; Step 8: lifting the drilling tool, and then taking out the low-permeability coal seam hydraulic directional drilling and protection integrated system from outside the hole; Step 9: hole sealing and continuous extraction.

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