Wireless measurement-while-drilling directional drilling protection hole-forming drilling tool and hole-forming method

Abstract

The invention discloses a wireless measurement-while-drilling directional drilling protection pore-forming drilling tool which comprises a directional drill bit, a hollow screw motor short section, a hollow non-magnetic short section, a drill rod and a water feeder which are sequentially communicated from front to back, and the water feeder is connected with a pressure sensor; a first overflowing channel is arranged in the directional drill bit; a second overflowing channel is arranged in the hollow screw motor short section; the hollow non-magnetic short section comprises a non-magnetic short section outer pipe and a recoverable wireless measurement-while-drilling instrument assembly arranged in the non-magnetic short section outer pipe in a sleeved mode. According to the drilling tool, the recoverable wireless measurement-while-drilling instrument assembly is arranged in the non-magnetic short section outer pipe, wireless measurement-while-drilling in the drilling process can be achieved, and the measurement instrument assembly can be recovered without lifting the drill after measurement is completed; after the recoverable wireless measurement-while-drilling instrument assembly is lifted out, a physical channel can be provided for lowering of the screen pipe while drilling, and therefore wireless measurement-while-drilling directional drilling and protection integrated construction is achieved.

Description

Technical Field

[0001] The present invention belongs to the field of underground drilling in coal mines, and relates to a hole-forming drill tool, in particular to a wireless measurement while drilling (MWD) directional drill hole protection and hole-forming drill tool and a hole-forming method. Background Art

[0002] Soft broken coal seams generally have the characteristics of complex tectonic stress, high gas pressure, low permeability, and broken coal bodies. During the construction of gas drainage boreholes, problems such as borehole collapse, hole gushing, and borehole wall instability are likely to occur, resulting in shallow hole depth and borehole blockage, which affect the gas control effect. Therefore, safe and efficient hole formation and hole protection in soft broken coal seams have always been a major requirement and research hotspot in gas control.

[0003] The wireless measurement while drilling (MWD) directional drilling technology uses mud pulse or electromagnetic wave as the measurement signal transmission carrier, without the need to configure a communication cable drill pipe for signal transmission, with lower drill tool costs, and has the characteristics of controllable borehole trajectory, high utilization rate, and large hole depth. It is increasingly widely used in the construction of various directional boreholes in underground coal mines. The existing full-hole section screen pipe hole protection technology uses the inner through-hole of the "open-close bit + hollow drill pipe" as the screen pipe lowering channel, and lowers the screen pipe to the actual hole depth position, solving the problem that the screen pipe cannot be lowered to the actual hole depth after the drill is lifted in the soft broken coal seam borehole, ensuring the smoothness of the gas drainage channel, and effectively improving the gas drainage effect in the soft broken coal seam.

[0004] However, under the existing technical conditions, the central channels of the positive displacement motor, probe, and mud pulse generator supporting the wireless measurement while drilling (MWD) directional drilling technology are all occupied by special devices, resulting in the inability to directly lower the screen pipe through the inner hole of the above drill tools. After the directional borehole is completed, it is necessary to lift the drill and then lower the drill tool combination of the "open-close bit + hollow drill pipe" to lower the screen pipe, resulting in increased construction costs and reduced construction efficiency. Summary of the Invention

[0005] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a wireless measurement while drilling (MWD) directional drill hole protection and hole-forming drill tool and a hole-forming method to solve the technical problems of large workload and low efficiency caused by separate operations of directional borehole drilling and screen pipe hole protection in the existing technology.

[0006] To solve the above technical problems, the present invention is implemented by adopting the following technical solutions:

[0007] A wireless measurement while drilling (MWD) directional drill hole protection and hole-forming drill tool includes a directional bit, a hollow positive displacement motor short section, a hollow non-magnetic short section, a drill pipe, and a water feeder that are sequentially connected and communicated from front to back. A pressure sensor is connected to the water feeder;

[0008] A first flow-through channel is arranged in the directional bit; a second flow-through channel is arranged in the hollow positive displacement motor short section;

[0009] The hollow non-magnetic sub includes a non-magnetic sub outer tube and a recoverable wireless measurement-while-drilling (MWD) instrument assembly sleeved inside the non-magnetic sub outer tube;

[0010] The recoverable wireless MWD instrument assembly includes a recovery unit, a pulse generator, a power supply unit, a measurement probe, and a planetary connector that are sequentially connected from the rear to the front; a third flow passage is formed between the recovery unit and the non-magnetic sub outer tube; a fourth flow passage is formed between the power supply unit and the non-magnetic sub outer tube; a fifth flow passage is formed between the measurement probe and the non-magnetic sub outer tube; a sixth flow passage is formed between the planetary connector and the non-magnetic sub outer tube;

[0011] The first flow passage, the second flow passage, the third flow passage, the fourth flow passage, the fifth flow passage, and the sixth flow passage are connected and arranged in communication;

[0012] The recovery unit includes a guide joint, a piston cylinder, and a conversion joint that are coaxially connected; a first flow hole is formed in the side wall of the conversion joint, and the first flow hole is used to communicate the third flow passage with a first flow cavity provided inside the conversion joint;

[0013] The pulse generator includes a pulse generator housing. A second flow hole communicating with the first flow cavity is formed on the rear end face inside the pulse generator housing. A pulse chamber is provided inside the pulse generator housing. The second flow hole communicates with the pulse chamber. A fixing ring is sleeved at one end of the pulse chamber close to the power supply unit. Third flow holes respectively communicating with the pulse chamber and the fourth flow passage are formed on the side wall of the fixing ring;

[0014] A pulse piston is provided inside the pulse chamber. The front end of the pulse piston is drivingly connected to a power mechanism, and the front end of the power mechanism is connected to the measurement probe; the pulse piston can reciprocate axially in the pulse chamber under the drive of the power mechanism to close or open the second flow hole.

[0015] The present invention also has the following technical features:

[0016] Specifically, a piston rod is movably inserted into the piston cylinder. The piston rod penetrates out of the piston cylinder. The front end of the piston rod is connected to a spring pin penetrating through the side wall of the piston cylinder, and the spring pin can move radially under the drive of the piston rod.

[0017] Furthermore, the piston rod includes a first connection section, a second connection section, and a third connection section that are integrally connected. A first limiting step is formed at the connection between the first connection section and the second connection section;

[0018] A compression spring is sleeved on the first connecting section. The front end of the compression spring abuts against the rear end face of the second connecting section, and the rear end of the compression spring abuts against the inner wall of the piston barrel.

[0019] A sealing ring is also sleeved on the first connecting section. The inner wall of the sealing ring is connected to the first connecting section, and the outer wall of the sealing ring is connected to the piston barrel.

[0020] Furthermore, the guiding joint includes a hook body and a mounting section which are integrally connected. An installation hole is axially formed in the mounting section, and the rear end of the first connecting section passes through the piston barrel and extends into the installation hole.

[0021] Furthermore, a pin slot capable of being inserted and matched with the spring pin is formed on the inner wall of the non-magnetic short sub outer tube; the spring pin is connected to the piston rod through a pull rope.

[0022] Furthermore, an acceleration sensor module, a temperature sensor module, a magnetic sensor module, a microcontroller module, a storage module and a power supply module are arranged in the measurement probe.

[0023] The storage module is respectively connected to the acceleration sensor module, the temperature sensor module, the magnetic sensor module and the microcontroller module.

[0024] The power supply module is respectively connected to the acceleration sensor module, the temperature sensor module, the magnetic sensor module and the transmission module.

[0025] The acceleration sensor is used to collect the three-axis acceleration data of the drill string and transmit the collected data to the storage module. The temperature sensor module is used to collect the fluid temperature data and transmit the collected data to the storage module. The magnetic sensor module is used to collect the geomagnetic field intensity data at the position of the drill string and transmit the collected data to the storage module. The storage module is used to receive and store the data and send the stored data to the transmission module; the transmission module is connected to an external control system and is used to transmit the received data to the external control system.

[0026] Furthermore, the hollow type screw motor short sub includes a screw motor short sub outer tube and a rotor arranged in the screw motor short sub outer tube. A second flow passage is formed between the screw motor short sub outer tube and the rotor; an inner hole is formed through the rotor.

[0027] Furthermore, the planetary connector includes a sleeve with an open rear end. A T-shaped rod is arranged in the sleeve. The rear end of the T-shaped rod is connected to a stop block fixed in the sleeve. The front end of the T-shaped rod passes through the sleeve and is connected to a rubber plug arranged outside the sleeve. The rubber plug can be hermetically connected to the inner hole.

[0028] Further, the pulse piston includes a frustum-shaped sealing section, a first cylindrical section, and a second cylindrical section that are integrally connected. The second cylindrical section is connected to the power mechanism;

[0029] The first flow hole includes a cylindrical hole and a frustum-shaped hole that are connected. The outer contour of the frustum-shaped sealing section matches the inner contour of the frustum-shaped hole.

[0030] The present invention also protects a method for wireless measurement while drilling and directional drilling hole protection and formation. This method is realized by the above-mentioned wireless measurement while drilling and directional drilling hole protection and formation drilling tool, and includes the following steps:

[0031] Step 1: Assemble the retrievable wireless measurement while drilling instrument assembly;

[0032] Step 2: Install the retrievable wireless measurement while drilling instrument assembly into the non-magnetic short joint outer tube, so that the spring pin enters the pin slot to complete the axial positioning of the retrievable wireless measurement while drilling instrument assembly;

[0033] Step 3: Connect the directional drill bit, the hollow type screw motor, and the hollow type non-magnetic short joint in sequence, so that the rubber plug enters the inner hole of the rotor, connect the drill pipe and the water feeder to complete the assembly of the wireless measurement while drilling and directional drilling hole protection and formation drilling tool;

[0034] Step 4: Carry out directional drilling construction according to the designed drilling trajectory. During the directional drilling process, when reaching the designed measurement point, start the power mechanism to drive the pulse piston to reciprocate in the pulse chamber to close or open the second flow hole, generate pressure pulses, and send the measurement data collected by the measurement probe tube to the external control system in the form of pulses to complete the measurement data acquisition; stop the construction after drilling to the target hole depth and complete the hole washing operation;

[0035] Step 5: Disconnect the water feeder; lower the fishing device to retrieve the guide head, drive the spring pin body to retract, so that the retrievable wireless measurement while drilling instrument assembly is separated from the non-magnetic short joint outer tube; lift out the wireless measurement while drilling instrument assembly;

[0036] Step 6: Lower the screen pipe into the drill pipe. The screen pipe enters the borehole through the inside of the wireless measurement while drilling and directional drilling hole protection and formation drilling tool;

[0037] Step 7: Lift out the drill pipe, the non-magnetic short joint outer tube, the hollow type screw motor short joint, and the open-close type drill bit in sequence;

[0038] Step 8: Seal the hole and connect for pumping.

[0039] Compared with the prior art, the beneficial technical effects of the present invention are:

[0040] (Ⅰ) The drill tool of the present invention can realize wireless measurement while drilling during the drilling process and recover the measurement instrument assembly without pulling out the drill by setting a recoverable wireless measurement while drilling instrument assembly inside the non-magnetic sub outer tube. After the recoverable wireless measurement while drilling instrument assembly is taken out, it can also provide a physical channel for the lowering of the screen pipe while drilling, thus realizing the integrated construction of wireless measurement while drilling and directional drilling protection.

[0041] (2) The recoverable wireless measurement while drilling instrument assembly in the present invention is mechanically assembled and disassembled with the non-magnetic sub outer tube, and has the characteristics of flexible use, convenience, and low labor intensity.

[0042] (3) The method of the present invention solves the problem that the screen pipe cannot be lowered through the inner hole of the drill tool after directional drilling and hole formation using the wireless measurement while drilling system in the prior art by lowering and recovering the wireless measurement while drilling and directional drilling protection hole-forming drill tool without pulling out the drill. Description of the Drawings

[0043] Figure 1 is a schematic diagram of the drilling state of the wireless measurement while drilling and directional drilling protection hole-forming drill tool, where the arrow indicates the fluid flow direction;

[0044] Figure 2 is a schematic diagram of the recovery state of the wireless measurement while drilling and directional drilling protection hole-forming drill tool, where the arrow indicates the fluid flow direction;

[0045] Figure 3 is a schematic diagram of the structure of the recoverable wireless measurement while drilling instrument assembly;

[0046] Figure 4 is a schematic diagram of the structure of the recovery unit;

[0047] Figure 5 is a schematic diagram of the structure of the pulse generator;

[0048] Figure 6 is a schematic diagram of the structure of the planetary connector;

[0049] The reference numerals in the figure are represented as:

[0050] 1 - directional drill bit, 2 - hollow type positive displacement motor sub, 3 - hollow type non-magnetic sub, 4 - drill pipe, 5 - water feeder;

[0051] 21 - positive displacement motor sub outer tube, 22 - rotor;

[0052] 31 - non-magnetic sub outer tube, 32 - recoverable wireless measurement while drilling instrument assembly;

[0053] 321 - recovery unit, 322 - pulse generator, 323 - power supply unit, 324 - measurement probe, 325 - planetary connector;

[0054] 3211 - Guide joint, 3212 - Piston cylinder, 3213 - Adapter joint, 3214 - Piston rod, 3215 - Spring pin, 3216 - Compression spring, 3217 - Sealing ring, 3218 - Pull rope;

[0055] 3251 - Sleeve, 3252 - T-shaped rod, 3253 - Stop block, 3254 - Rubber plug;

[0056] 32111 - Hook body, 32112 - Installation section;

[0057] 32131 - First flow hole, 32132 - First flow cavity;

[0058] 32141 - First connection section, 32142 - Second connection section, 32143 - Third connection section,

[0059] 3221 - Pulse generator housing, 3222 - Fixed ring, 3223 - Pulse piston; 3224 - Power mechanism;

[0060] 32211 - Pulse chamber, 32212 - Second flow hole;

[0061] 32221 - Third flow hole;

[0062] 32231 - Frustum-shaped plugging section, 32232 - First cylindrical section, 32233 - Second cylindrical section.

[0063] The specific content of the present invention will be further explained in detail below in conjunction with embodiments. Specific embodiments

[0064] It should be noted that, without special instructions, all components in the present invention, such as, directional drill bits, water conveyors, hollow screw motor subsections, are all components known in the art.

[0065] The terms "upper", "lower", "front", "rear", "top", "bottom", etc. used in the present invention to indicate the orientation or position relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. "Inner" and "outer" refer to the inside and outside of the corresponding component contour, and the above terms should not be construed as limiting the present invention.

[0066] In addition, ordinal numbers such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second" may explicitly or implicitly include one or more of such features.

[0067] In the present invention, unless otherwise specified, terms such as "installation", "connection", "attachment", "fixation" shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral body; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent transformations made on the basis of the technical solutions of this application fall within the protection scope of the present invention.

[0069] Embodiment 1

[0070] In compliance with the above technical solution, as Figures 1 to 6 shown, this embodiment provides a wireless measurement while drilling (MWD) directional drilling hole protection and forming drill tool, including a directional drill bit 1, a hollow screw motor sub 2, a hollow non-magnetic sub 3, a drill pipe 4 and a water feeder 5 which are sequentially connected and communicated from front to back; the water feeder 5 is used to send fluid into the drill pipe, and the fluid enters the directional drill bit 1 after passing through the water feeder 5, the drill pipe 4, the hollow non-magnetic sub 3 and the hollow screw motor sub 2, and then sprays out from the directional drill bit 1. A pressure sensor for collecting the pressure data inside the drill tool is connected to the water feeder 5, and the pressure sensor is connected to an external control system and can transmit the collected pressure data to the external control system;

[0071] The directional drill bit 1 selects an existing drill bit, and a first flow passage is arranged inside the directional drill bit 1. In this embodiment, the inner diameter of the first flow passage is larger than the outer diameter of the screen pipe to be run in, so as to ensure that the screen pipe can pass through the first flow passage.

[0072] A second flow passage is arranged inside the hollow screw motor sub 2; the inner diameter of the second flow passage is larger than the outer diameter of the screen pipe to be run in, so as to ensure that the screen pipe can pass through the second flow passage.

[0073] The hollow non-magnetic sub 3 includes a non-magnetic sub outer pipe 31 and a retrievable MWD instrument assembly 32 detachably sleeved inside the non-magnetic sub outer pipe 31; the retrievable MWD instrument assembly 32 is installed inside the non-magnetic sub outer pipe 31, and can block the inner hole of the rotor in the hollow screw motor sub 2, and the inner diameter of the inner hole is larger than the outer diameter of the screen pipe to be run in, so as to ensure that the screen pipe can pass through smoothly.

[0074] The retrievable MWD instrument assembly 32 includes a recovery unit 321, a pulse generator 322, a power supply unit 323, a measurement probe 324 and a planetary connector 325 which are sequentially connected from back to front;

[0075] Among them, when recovering the retrievable wireless measurement-while-drilling instrument assembly 32, the recovery unit 321 can be connected to a fishing tool for recovery to lift the retrievable wireless measurement-while-drilling instrument assembly 32; the pulse generator 322 can connect / block the fluid flow path at a certain frequency, thereby generating pulses in the flow channel. The ground staff uses existing software set in the external control system to detect and decode these pulses on the ground to obtain detection data.

[0076] The power supply unit 323 is used to supply power to the pulse generator 322 and the measurement probe 324; in this embodiment, the power supply unit 323 is a battery cylinder with a built-in battery. The measurement probe 324 is used to collect data at each preset sampling point during drilling and send the collected data to the external control system; a third flow channel is formed between the recovery unit 321 and the non-magnetic sub outer tube 31; a fourth flow channel is formed between the power supply unit 323 and the non-magnetic sub outer tube 31; a fifth flow channel is formed between the measurement probe 324 and the non-magnetic sub outer tube 31; a sixth flow channel is formed between the planetary connector 325 and the non-magnetic sub outer tube 31;

[0077] The first flow channel, the second flow channel, the third flow channel, the fourth flow channel, the fifth flow channel, and the sixth flow channel are connected and arranged to form a fluid channel; the fluid sent by the water feeder can flow in the fluid channel and then spray out from the directional drill bit 1.

[0078] The recovery unit 321 includes a guide joint 3211, a piston cylinder 3212, and a conversion joint 3213 that are coaxially connected; a first flow hole 32131 is opened on the side wall of the conversion joint 3213, and the first flow hole 32131 is used to connect the third flow channel and the first flow cavity 32132 provided in the conversion joint 3213;

[0079] The pulse generator 322 includes a pulse generator housing 3221. The rear end of the conversion joint 3213 is hermetically connected to the piston cylinder 3212, and the front end of the conversion joint 3213 is connected to the pulse generator housing 3221. A second flow hole 32212 communicating with the first flow cavity 32132 is opened on the rear end face inside the pulse generator housing 3221. A pulse chamber 32211 is provided inside the pulse generator housing 3221. The second flow hole 32212 is connected to the pulse chamber 32211. A fixing ring 3222 is sleeved at one end of the pulse chamber 32211 close to the power supply unit 323, and the rear end of the power supply unit 323 penetrates into the inner hole of the fixing ring 3222.

[0080] In this embodiment, the fixing ring 3222 is fixedly installed in the pulse chamber 32211, and a third flow hole 32221 communicating with the pulse chamber 32211 and the fourth flow channel is opened on the side wall of the fixing ring 3222;

[0081] A pulse piston 3223 is provided in the pulse chamber 32211. A power mechanism 3224 is drivingly connected to the front end of the pulse piston 3223. The front end of the power mechanism 3224 is connected to the measurement probe 324. The pulse piston 3223 can reciprocate axially in the pulse chamber 32211 driven by the power mechanism 3224 to close or open the second flow-through hole 32212. Through the reciprocating motion of the pulse piston 3223, the second flow-through hole is closed or opened at a certain frequency, thereby connecting / blocking the fluid flow channel and generating pulses in the flow channel. The ground staff detects and decodes these pulses on the ground to obtain detection data.

[0082] Pulses can be generated in the drill string. In this embodiment, the power mechanism 3224 is a direct drive motor, and the direct drive motor is electrically connected to the power supply unit 323. The direct drive motor can drive the pulse piston 3223 to reciprocate under the control of an external control system.

[0083] As a preferred solution of this embodiment, a piston rod 3214 is movably inserted into the piston cylinder 3212. The piston rod 3214 passes through the piston cylinder 3212 and is connected to the guide joint 3211. The front end of the piston rod 3214 is connected to a spring pin 3215 inserted on the side wall of the piston cylinder 3212. The spring pin 3215 can move radially under the drive of the piston rod 3214, extending out of or retracting into the piston cylinder 3212. When the piston rod 3214 moves backward, it can drive the spring pin 3215 to move radially into the piston cylinder 3212.

[0084] As a preferred solution of this embodiment, the piston rod 3214 includes a first connection section 32141, a second connection section 32142, and a third connection section 32143 that are integrally connected. A first limiting step is formed at the connection between the first connection section 32141 and the second connection section 32142;

[0085] A compression spring 3216 is sleeved on the first connection section 32141. The front end of the compression spring 3216 abuts against the rear end face of the second connection section 32142, and the rear end of the compression spring 3216 abuts against the inner wall of the piston cylinder 3212. When the compression spring 3216 is compressed, the piston rod 3214 can axially move backward, thereby pulling the pull rope 3218 and driving the spring pin 3215 to radially retract, so that the non-magnetic sub outer tube 31 is separated from the retrievable wireless measurement-while-drilling instrument assembly 32. After the compression spring 3216 rebounds, the piston rod 3214 can axially move forward, causing the spring pin 3215 to radially extend out of the piston cylinder 3212 and extend into the pin slot.

[0086] A sealing ring 3217 is also sleeved on the first connecting section 32141. The inner wall of the sealing ring 3217 is connected to the first connecting section 32141, and the outer wall of the sealing ring 3217 is connected to the piston cylinder 3212. The sealing ring 3217 is used to seal the gap between the first connecting section 32141 and the piston cylinder 3212.

[0087] As a preferred solution of this embodiment, the guide joint 3211 includes a hook body 32111 and an installation section 32112 which are integrally connected and arranged. An installation hole is axially formed in the installation section 32112. After the first connecting section 32141 passes through the piston cylinder 3212, it extends into the installation hole. The hook body 32111 can cooperate with a fishing tool in the lowered drill string, and the fishing tool extracts the retrievable wireless measurement-while-drilling instrument assembly by means of the hook body.

[0088] As a preferred solution of this embodiment, a pin slot capable of being inserted and matched with the spring pin 3215 is formed on the inner wall of the non-magnetic sub outer tube 31; the spring pin 3215 is connected to the piston rod 3214 through a pull rope 3218.

[0089] As a preferred solution of this embodiment, an acceleration sensor module, a temperature sensor module, a magnetic sensor module, a microcontroller module, a storage module and a power supply module are arranged in the measurement probe 324;

[0090] The storage module is respectively connected to the acceleration sensor module, the temperature sensor module, the magnetic sensor module and the microcontroller module;

[0091] The power supply module is respectively connected to the acceleration sensor module, the temperature sensor module, the magnetic sensor module and the transmission module;

[0092] The acceleration sensor is used to collect the three-axis acceleration data of the drill string and transmit the collected data to the storage module. The temperature sensor module is used to collect the fluid temperature data and transmit the collected data to the storage module. The magnetic sensor module is used to collect the geomagnetic field intensity data at the location of the drill string and transmit the collected data to the storage module. The storage module is used to receive and store the data and send the stored data to the transmission module; the transmission module is connected to an external control system and is used to transmit the received data to the external control system.

[0093] In other embodiments, other existing logging modules can also be arranged in the measurement probe 324 according to needs to collect other data that need to be collected.

[0094] As a preferred solution of this embodiment, the hollow type positive displacement motor sub 2 includes a positive displacement motor sub outer tube 21 and a rotor 22 arranged inside the positive displacement motor sub outer tube 21. A second flow passage is formed between the positive displacement motor sub outer tube 21 and the rotor 22; an inner hole is formed through the rotor 22.

[0095] As a preferred solution of this embodiment, the planetary connector 325 includes a sleeve 3251 with an open rear end. The rear end of the sleeve 3251 is sleeved on the measurement probe 324. A T-shaped rod 3252 is inserted into the sleeve 3251. The rear end of the T-shaped rod 3252 is connected to a stop block 3253 fixed inside the sleeve 3251. The stop block 3253 is used to limit the axial backward movement of the T-shaped rod 3252, and the front end face of the sleeve 3251 is used to limit the axial forward movement of the T-shaped rod 3252. The front end of the T-shaped rod 3252 passes through the sleeve 3251 and is connected to a rubber plug 3254 arranged outside the sleeve 3251. The rubber plug 3254 can be hermetically connected to the inner hole. Preferably, the front end of the rubber plug 3254 is provided with a chamfer to facilitate its entry into the inner hole. The sleeve 3251, the T-shaped rod 3252, the stop block 3253 and the rubber plug 3254 are all made of non-magnetic materials.

[0096] As a preferred solution of this embodiment, the pulse piston 3223 includes an integrally connected frustum-shaped sealing section 32231, a first cylindrical section 32232 and a second cylindrical section 32233. The second cylindrical section 32233 is connected to the power mechanism 3224.

[0097] The first flow passage hole 32131 includes a connected cylindrical hole and a frustum-shaped hole. The outer profile of the frustum-shaped sealing section 32231 matches the inner profile of the frustum-shaped hole. The frustum-shaped sealing section 32231 can seal the frustum-shaped hole.

[0098] During use, first, the assembled retrievable wireless logging-while-drilling instrument assembly 32 is installed into the non-magnetic sub outer tube 31. The spring pin 3215 enters the pin slot on the inner wall of the non-magnetic sub outer tube 31 to realize the overall limitation of the retrievable wireless logging-while-drilling instrument assembly 32, and the rubber plug 3254 is hermetically connected to the inner hole. During drilling, the fluid sent out from the water feeder 5 passes through the connected third flow passage, fourth flow passage, fifth flow passage, sixth flow passage, second flow passage and first flow passage and is ejected from the directional drill bit 1 to realize the drilling construction. After the drilling construction is completed and before the screen pipe is lowered, a fishing tool is lowered and connected to the guide joint 3211. Under the action of the fishing tool, the guide joint 3211 is pulled, the compression spring 3216 is compressed by the piston rod 3214, the piston rod 3214 moves axially backward, pulls the pull rope 3218, and then drives the spring pin 3215 to radially retract. The retrievable wireless logging-while-drilling instrument assembly 32 is separated from the non-magnetic sub outer tube 31, and the fishing tool can take out the retrievable wireless logging-while-drilling instrument assembly 32. Then, the screen pipe can be lowered into the drill string and passed through the channel in the drill string into the borehole.

[0099] Embodiment 2

[0100] This embodiment provides a method for protecting and forming a hole in a wireless measurement while drilling (MWD) directional drill, which is realized by the MWD directional drill tool for protecting and forming a hole provided in Embodiment 1, and includes the following steps:

[0101] Step 1. Assemble the retrievable wireless MWD instrument assembly;

[0102] Step 2. Install the retrievable wireless MWD instrument assembly into the non-magnetic sub outer tube, and make the spring pin enter the pin slot to complete the axial positioning of the retrievable wireless MWD instrument assembly;

[0103] Step 3. Connect the directional bit, the hollow type positive displacement motor and the hollow type non-magnetic sub in sequence, make the rubber plug enter the inner hole of the rotor, connect the drill pipe and the water feeder to complete the assembly of the MWD directional drill tool for protecting and forming a hole;

[0104] Step 4. Carry out directional drilling construction according to the designed borehole trajectory. During the directional drilling process, when reaching the designed measurement point, start the power mechanism to drive the pulse piston to reciprocate in the pulse chamber to close or open the second flow-through hole, generate a pressure pulse inside the drill tool, and send the measurement data collected by the measurement probe tube to the external control system in the form of a pulse to complete the acquisition of measurement data; stop the construction after drilling to the target hole depth and complete the hole washing operation;

[0105] Step 5. Disconnect the water feeder; lower the fishing device to retrieve the guide head, drive the spring pin body to retract, separate the retrievable wireless MWD instrument assembly from the non-magnetic sub outer tube; lift out the wireless MWD instrument assembly;

[0106] Step 6. Lower the screen pipe into the drill pipe, and the screen pipe enters the borehole through the inside of the MWD directional drill tool for protecting and forming a hole;

[0107] Step 7. Lift out the drill pipe, the non-magnetic sub outer tube, the hollow type positive displacement motor sub and the open / closed bit in sequence;

[0108] Step 8. Seal the hole and connect for pumping.

[0109] The preferred embodiments of the present disclosure have been described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0110] In addition, it should be noted that, in the various specific technical features described in the above specific embodiments, they can be combined in any appropriate manner without conflict. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination manners.

Claims

1. A wireless measurement while drilling directional drilling tool, characterized in that: The invention comprises a directional drill bit (1), a hollow screw motor short section (2), a hollow non-magnetic short section (3), a drill rod (4) and a water feeder (5) which are sequentially connected from front to back, wherein the water feeder (5) is connected to a pressure sensor; The directional drill bit (1) is provided with a first flow passage; the hollow screw motor short section (2) is provided with a second flow passage; The hollow non-magnetic short joint (3) comprises a non-magnetic short joint outer tube (31) and a retrievable wireless drilling measurement instrument assembly (32) sleeved in the non-magnetic short joint outer tube (31); The retrievable wireless measurement while drilling instrument assembly (32) comprises a recovery unit (321), a pulse generator (322), a power supply unit (323), a measuring probe (324) and a planetary connector (325) which are sequentially connected from back to front; a third flow passage is formed between the recovery unit (321) and the non-magnetic short-joint outer tube (31); a fourth flow passage is formed between the power supply unit (323) and the non-magnetic short-joint outer tube (31); a fifth flow passage is formed between the measuring probe (324) and the non-magnetic short-joint outer tube (31); and a sixth flow passage is formed between the planetary connector (325) and the non-magnetic short-joint outer tube (31); The first flow passage, the second flow passage, the third flow passage, the fourth flow passage, the fifth flow passage and the sixth flow passage are connected; The recovery unit (321) comprises a guide joint (3211), a piston cylinder (3212) and a conversion joint (3213) which are coaxially connected; a first flow hole (32131) is provided on a side wall of the conversion joint (3213), and the first flow hole (32131) is used to connect a third flow channel and a first flow chamber (32132) provided in the conversion joint (3213); The pulse generator (322) comprises a pulse generator housing (3221), a second flow hole (32212) communicating with the first flow cavity (32132) is provided on the rear end surface of the pulse generator housing (3221), a pulse bin (32211) is provided in the pulse generator housing (3221), the second flow hole (32212) is communicated with the pulse bin (32211), a fixing ring (3222) is sleeved on one end of the pulse bin (32211) close to the power supply unit (323), and a third flow hole (32221) communicating with the pulse bin (32211) and a fourth flow channel respectively is provided on the side wall of the fixing ring (3222); A pulse piston (3223) is arranged in the pulse chamber (32211), and the front end of the pulse piston (3223) is connected to a power mechanism (3224), and the front end of the power mechanism (3224) is connected to the measuring probe (324); the pulse piston (3223) can reciprocate axially in the pulse chamber (32211) driven by the power mechanism (3224) to close or open the second flow hole (32212).

2. The wireless measurement while drilling directional drilling tool according to claim 1, characterized in that: A piston rod (3214) is movably inserted into the piston cylinder (3212). The piston rod (3214) passes through the piston cylinder (3212). The front end of the piston rod (3214) is connected to a spring pin (3215) inserted into the side wall of the piston cylinder (3212). The spring pin (3215) can move radially under the drive of the piston rod (3214).

3. The wireless measurement while drilling directional drilling tool as claimed in claim 2, characterized in that: The piston rod (3214) comprises a first connecting section (32141), a second connecting section (32142) and a third connecting section (32143) which are integrally connected, and a first limiting step is formed at the connection between the first connecting section (32141) and the second connecting section (32142); The first connecting section (32141) is sleeved with a compression spring (3216), the front end of the compression spring (3216) is in contact with the rear end surface of the second connecting section (32142), and the rear end of the compression spring (3216) is in contact with the inner wall of the piston cylinder (3212); A sealing ring (3217) is also sleeved on the first connecting section (32141), the inner wall of the sealing ring (3217) is connected to the first connecting section (32141), and the outer wall of the sealing ring (3217) is connected to the piston cylinder (3212).

4. The wireless measurement while drilling directional drilling tool as claimed in claim 3, characterized in that: The guide joint (3211) comprises a hook body (32111) and a mounting section (32112) which are integrally connected, a mounting hole is axially provided in the mounting section (32112), and a rear end of the first connecting section (32141) passes through the piston cylinder (3212) and extends into the mounting hole.

5. The wireless measurement while drilling directional drilling tool as claimed in claim 2, characterized in that: A pin groove capable of being plugged and matched with the spring pin (3215) is provided on the inner wall of the non-magnetic short section outer tube (31); the spring pin (3215) is connected to the piston rod (3214) via a pull rope (3218).

6. The wireless measurement while drilling directional drilling tool according to claim 2, characterized in that: The measuring probe (324) is provided with an acceleration sensor module, a temperature sensor module, a magnetic sensor module, a microcontroller module, a storage module and a power supply module; The storage module is connected to the acceleration sensor module, the temperature sensor module, the magnetic sensor module, and the microcontroller module respectively; The power supply module is respectively connected to the acceleration sensor module, the temperature sensor module, the magnetic sensor module and the transmission module; The acceleration sensor is used to collect the three-axis acceleration data of the drilling tool and transmit the collected data to the storage module, the temperature sensor module is used to collect the fluid temperature data and transmit the collected data to the storage module, the magnetic sensor module is used to collect the geomagnetic field strength data at the location of the drilling tool and transmit the collected data to the storage module, the storage module is used to receive and store data, and send the stored data to the transmission module; The transmission module is connected to the external control system and is used to transmit the received data to the external control system.

7. The wireless measurement while drilling directional drilling tool according to claim 1, characterized in that: The hollow screw motor short section (2) comprises a screw motor short section outer tube (21) and a rotor (22) inserted into the screw motor short section outer tube (21); the second flow passage is formed between the screw motor short section outer tube (21) and the rotor (22); and an inner hole is provided through the rotor (22).

8. The wireless measurement while drilling directional drilling tool according to claim 7, characterized in that: The planetary connector (325) comprises a sleeve (3251) with an open rear end, the rear end of the sleeve (3251) being sleeved on the measuring probe (324), a T-shaped rod (3252) being passed through the sleeve (3251), the rear end of the T-shaped rod (3252) being connected to a stopper (3253) fixed in the sleeve (3251), the front end of the T-shaped rod (3252) passing through the sleeve (3251) and being connected to a rubber plug (3254) disposed outside the sleeve (3251), and the rubber plug (3254) being capable of being sealed and connected to the inner hole.

9. The wireless measurement while drilling directional drilling tool according to claim 2, characterized in that: The pulse piston (3223) comprises a truncated cone-shaped blocking section (32231), a first cylindrical section (32232) and a second cylindrical section (32233) which are integrally connected, and the second cylindrical section (32233) is connected to the power mechanism (3224); The first flow hole (32131) comprises a cylindrical hole and a truncated cone-shaped hole which are connected to each other, and the outer contour of the truncated cone-shaped blocking section (32231) matches the inner contour of the truncated cone-shaped hole.

10. A wireless measurement while drilling directional drilling method, characterized in that: The method is implemented by the wireless measurement while drilling directional drilling tool according to any one of claims 1 to 9, and comprises the following steps: Step 1: Complete the assembly of the recyclable wireless while-drilling measurement instrument assembly; Step 2, install the recyclable wireless drilling measurement instrument assembly into the outer tube of the non-magnetic short joint, so that the spring pin enters the pin groove, and completes the axial positioning of the recyclable wireless drilling measurement instrument assembly; Step 3, sequentially connect the directional drill bit, the hollow screw motor and the hollow non-magnetic short joint, allow the rubber plug to enter the inner hole of the rotor, connect the drill rod and the water feeder, and complete the assembly of the wireless measurement while drilling directional drilling protection hole forming drill tool; Step 4: directional drilling is carried out according to the designed drilling trajectory. During the directional drilling process, when the designed measuring point is reached, the power mechanism is started to drive the pulse piston to reciprocate in the pulse chamber to close or open the second flow hole, generate a pressure pulse, and send the measurement data collected by the measuring probe to the external control system in the form of pulses to complete the measurement data collection; the construction is stopped after drilling to the target hole depth, and the hole washing operation is completed; Step 5, remove the water feeder; lower the salvage device to take out the guide head, drive the spring pin body to retract, and separate the recyclable wireless drilling measurement instrument assembly from the non-magnetic short-joint outer tube; lift out the wireless drilling measurement instrument assembly; Step 6: insert the screen pipe into the drill pipe, and the screen pipe enters the borehole through the wireless measurement while drilling directional drilling tool; Step 7, the drill rod, the non-magnetic short section outer tube, the hollow screw motor short section and the open-close drill bit are lifted out in sequence; Step 8: Seal the holes and continue pumping.

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