A wireless measurement-while-drilling directional drilling hole-making drilling tool and hole-making method

Abstract

The application discloses a wireless measurement while drilling directional drilling hole-protecting drilling tool, which comprises a directional drilling head, a hollow screw motor short section, a hollow non-magnetic short section, a drill pipe and a water feeder arranged in sequence from front to back and communicated with each other, and a pressure sensor is connected to the water feeder; a first flow passage is arranged in the directional drilling head; a second flow passage 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 recyclable wireless measurement while drilling instrument assembly arranged in the non-magnetic short section outer pipe; the drilling tool of the application can realize wireless measurement while drilling in the drilling process, and can realize non-drilling recovery of the measurement instrument assembly after the measurement is completed; after the recyclable wireless measurement while drilling instrument assembly is taken out, a physical channel can be provided for the screen pipe lowering while drilling, so that the wireless measurement while drilling directional drilling hole-protecting integrated construction is realized.

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 drilling hole protection hole-forming drill tool and a hole-forming method. Background Art

[0002] Soft broken coal seams generally have characteristics such as 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 spraying, and borehole wall instability are likely to occur, resulting in problems such as shallow hole-forming depth and borehole blockage, which affect the gas control effect. Therefore, safe and efficient hole-forming 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, does not require the configuration of a through-tubing drill pipe for signal transmission, has a lower drill tool cost, and has characteristics such as controllable borehole trajectory, high utilization rate, and large hole-forming 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 pulling out the drill 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 pull out the drill and then lower the drill tool combination of the "open-close bit + hollow drill pipe" to lower the screen pipe, resulting in an increase in construction cost and a decrease in 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 drilling hole protection 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 drilling hole protection 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 provided inside the directional bit; a second flow-through channel is provided inside the hollow positive displacement motor short section;

[0009] The hollow non-magnetic sub includes a non-magnetic sub outer tube and a retrievable wireless measurement-while-drilling instrument assembly sleeved inside the non-magnetic sub outer tube.

[0010] The retrievable wireless measurement-while-drilling instrument assembly includes a retrieval unit, a pulse generator, a power supply unit, a measuring probe, and a planetary connector, arranged sequentially from back to front. A third current-flow channel is formed between the retrieval unit and the non-magnetic short section outer tube; a fourth current-flow channel is formed between the power supply unit and the non-magnetic short section outer tube; a fifth current-flow channel is formed between the measuring probe and the non-magnetic short section outer tube; and a sixth current-flow channel is formed between the planetary connector and the non-magnetic short section outer tube.

[0011] The first, second, third, fourth, fifth, and sixth overcurrent channels are connected together.

[0012] The recycling unit includes a guide joint, a piston cylinder, and a conversion joint that are coaxially connected; a first flow hole is provided on the side wall of the conversion joint, and the first flow hole is used to connect a third flow channel and a first flow cavity provided in the conversion joint.

[0013] The pulse generator includes a pulse generator housing. A second flow hole communicating with the first flow cavity is opened on the rear end face of 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 on one end of the pulse chamber near the power supply unit. A third flow hole communicating with the pulse chamber and the fourth flow channel is opened on the side wall of the fixing ring.

[0014] A pulse piston is installed inside the pulse chamber, and a power mechanism is driven to the front end of the pulse piston. The front end of the power mechanism is connected to the measuring probe. The pulse piston can reciprocate along the axial direction inside 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 inside the piston cylinder, and the piston rod extends out of the piston cylinder. The front end of the piston rod is connected to a spring pin that passes through the side wall of the piston cylinder. The spring pin can move radially under the drive of the piston rod.

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

[0018] A compression spring is fitted 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 cylinder.

[0019] A sealing ring is also fitted on the first connecting section, with the inner wall of the sealing ring connected to the first connecting section and the outer wall of the sealing ring connected to the piston cylinder.

[0020] Furthermore, the guide joint includes an integrated hook body and an installation section, wherein an axial installation hole is provided in the installation section, and the rear end of the first connecting section extends out of the piston cylinder and into the installation hole.

[0021] Furthermore, the inner wall of the non-magnetic short section outer tube is provided with a pin groove that can be inserted and engaged with the spring pin; the spring pin is connected to the piston rod via a pull rope.

[0022] Furthermore, the measuring probe is equipped with an acceleration sensor module, a temperature sensor module, a magnetic sensor module, a microcontroller module, a storage module, and a power supply module.

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

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

[0025] The accelerometer is used to collect triaxial acceleration data of the drill bit and transmit the collected data to the storage module. The temperature sensor module is used to collect fluid temperature data and transmit the collected data to the storage module. The magnetic sensor module is used to collect geomagnetic field strength data at the location of the drill bit 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 an external control system and is used to transmit the received data to the external control system.

[0026] Furthermore, the hollow screw motor subsection includes an outer tube and a rotor passing through the outer tube, with the second flow channel formed between the outer tube and the rotor; the rotor has an inner hole through it.

[0027] Furthermore, the planetary connector includes a sleeve with an open rear end, a T-shaped rod passing through the sleeve, the rear end of the T-shaped rod being connected to a stop block fixed inside the sleeve, and the front end of the T-shaped rod passing through the sleeve and being connected to a rubber plug disposed outside the sleeve, the rubber plug being able to seal with the inner hole.

[0028] Furthermore, the pulse piston includes an integrally connected frustum-shaped sealing section, a first cylindrical section, and a second cylindrical section, the second cylindrical section being connected to the power mechanism;

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

[0030] This invention also protects a wireless measurement-while-drilling directional drilling and support method, which is implemented using the aforementioned wireless measurement-while-drilling directional drilling and support tool, and includes the following steps:

[0031] Step 1: Complete the assembly of the reusable wireless measurement while drilling instrument assembly;

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

[0033] Step 3: Connect the directional drill bit, hollow screw motor and hollow non-magnetic short section in sequence, so that the rubber plug enters the inner hole of the rotor, connect the drill rod and water feeder, and complete the assembly of the wireless measurement-while-drilling directional drilling support tool.

[0034] Step 4: Conduct directional drilling according to the borehole design trajectory. During the directional drilling process, when the designed measurement point is reached, 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 measuring probe to the external control system in the form of pulses to complete the measurement data acquisition. After drilling to the target hole depth, stop the construction and complete the hole washing operation.

[0035] Step 5: Disassemble the water supply device; lower the retrieval device to retrieve the guide head, causing the spring pin to retract and separate the retrievable wireless measurement-while-drilling instrument assembly from the non-magnetic short section outer tube; lift out the wireless measurement-while-drilling instrument assembly.

[0036] Step 6: Insert the screen pipe into the drill pipe. The screen pipe enters the borehole through the wireless measurement-while-drilling directional drilling tool.

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

[0038] Step 8: Seal the hole and continue pulling.

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

[0040] (I) The drilling tool of the present invention, by setting a retrievable wireless measurement-while-drilling instrument assembly inside the non-magnetic short section outer tube, can realize wireless measurement-while-drilling during the drilling process, and can also realize the retrieval of the measurement instrument assembly without lifting the drill after the measurement is completed; after the retrievable wireless measurement-while-drilling instrument assembly is lifted out, it can also provide a physical channel for the lowering of the drilling screen, thereby realizing the integrated construction of wireless measurement-while-drilling and directional drilling and support.

[0041] (2) The recyclable wireless drilling measurement instrument assembly and the non-magnetic short section outer tube in this invention are mechanically assembled and disassembled, which has the characteristics of flexible use, convenience and low labor intensity.

[0042] (3) The method of the present invention solves the problem in the prior art that after directional drilling using the wireless measurement while drilling system, the screen pipe cannot be lowered through the inner hole of the drill bit by lowering the drill bit and retrieving it without lifting the drill bit. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the drilling status of a wireless measurement-while-drilling directional drilling support tool, where the arrows indicate the direction of fluid flow;

[0044] Figure 2 This is a schematic diagram of the recovery status of the wireless measurement-while-drilling directional drilling support tool, where the arrows indicate the direction of fluid flow;

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

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

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

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

[0049] The labels in the diagram represent:

[0050] 1-Directional drill bit, 2-Hollow screw motor sub, 3-Hollow non-magnetic sub, 4-Drill rod, 5-Water feeder;

[0051] 21-Screw motor short section outer tube; 22-Rotor;

[0052] 31-Non-magnetic short section outer tube; 32-Retrievable wireless measurement while drilling instrument assembly;

[0053] 321-Recovery unit, 322-Pulse generator, 323-Power supply unit, 324-Measuring probe, 325-Planetary connector;

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

[0055] 3251 - Sleeve, 3252 - T-shaped rod, 3253 - Stopper, 3254 - Rubber stopper;

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

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

[0058] 32141 - First connecting segment, 32142 - Second connecting segment, 32143 - Third connecting segment

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

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

[0061] 32221 - Third flow passage;

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

[0063] The specific content of the present invention will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0064] It should be noted that, unless otherwise specified, all components in this invention, such as directional drill bits, water feeders, and hollow screw motor subsections, are components known in the art.

[0065] The terms “upper,” “lower,” “front,” “rear,” “top,” and “bottom” used in this invention refer to orientations or positional relationships only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. “Inner” and “outer” refer to the inner and outer contours of the corresponding components, and the above terms should not be construed as limitations on the invention.

[0066] Furthermore, the terms "first," "second," and other ordinal numbers are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0067] In this invention, unless otherwise stated, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the 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. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0069] Example 1

[0070] Following the above technical solutions, such as Figures 1 to 6 As shown, this embodiment provides a wireless measurement-while-drilling (MWD) directional drilling support 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 arranged sequentially from front to back. The water feeder 5 is used to deliver fluid into the drill pipe. The fluid enters the directional drill bit 1 after passing through the water feeder 5, drill pipe 4, hollow non-magnetic sub 3, and hollow screw motor sub 2, and then sprays out from the directional drill bit 1. A pressure sensor is connected to the water feeder 5 for collecting pressure data inside the drill tool. 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 is an existing drill bit. The directional drill bit 1 is provided with a first flow channel. In this embodiment, the inner diameter of the first flow channel is larger than the outer diameter of the screen tube to be inserted, so as to ensure that the screen tube can pass through the first flow channel.

[0072] The hollow screw motor section 2 is provided with a second flow channel; the inner diameter of the second flow channel is larger than the outer diameter of the screen tube to be inserted, so as to ensure that the screen tube can pass through the second flow channel.

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

[0074] The retrievable wireless measurement while drilling instrument assembly 32 includes a retrieval unit 321, a pulse generator 322, a power supply unit 323, a measuring probe 324, and a planetary connector 325, which are connected in reverse order from back to front.

[0075] When recovering the retrievable wireless measurement while drilling instrument assembly 32, the recovery unit 321 can be connected to the retrieval tool to lift the retrievable wireless measurement while drilling instrument assembly 32; the pulse generator 322 can connect / block the fluid flow channel at a certain frequency to generate pulses in the flow channel, and the ground personnel use 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 power the pulse generator 322 and the measuring probe 324; in this embodiment, the power supply unit 323 is a battery tube with a built-in battery. The measuring probe 324 is used to collect data at each preset sampling point during drilling and send the collected data to an external control system; a third flow channel is formed between the recovery unit 321 and the non-magnetic short section outer tube 31; a fourth flow channel is formed between the power supply unit 323 and the non-magnetic short section outer tube 31; a fifth flow channel is formed between the measuring probe 324 and the non-magnetic short section outer tube 31; and a sixth flow channel is formed between the planetary connector 325 and the non-magnetic short section outer tube 31.

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

[0078] The recycling unit 321 includes 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 the side wall of the conversion joint 3213. 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, a conversion connector 3213 whose rear end is sealed to the piston cylinder 3212, and a conversion connector 3213 whose front end is connected to the pulse generator housing 3221. A second flow hole 32212 communicating with the first flow cavity 32132 is provided on the rear end face of the pulse generator housing 3221. A pulse chamber 32211 is provided inside the pulse generator housing 3221. The second flow hole 32212 communicates with the pulse chamber 32211. A fixing ring 3222 is fitted inside the pulse chamber 32211 near the end of the power supply unit 323. The rear end of the power supply unit 323 passes through the inner hole of the fixing ring 3222.

[0080] In this embodiment, the fixing ring 3222 is fixedly installed inside the pulse chamber 32211, and the fixing ring 3222 has a third flow hole 32221 on its side wall that communicates with the pulse chamber 32211 and the fourth flow channel respectively.

[0081] A pulse piston 3223 is installed inside the pulse chamber 32211. 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 a measuring probe 324. The pulse piston 3223 can reciprocate along the axial direction inside the pulse chamber 32211 under the drive of the power mechanism 3224 to close or open the second flow passage 32212. Through the reciprocating motion of the pulse piston 3223, the second flow passage is closed or opened at a certain frequency, thereby connecting / blocking the fluid flow channel and generating pulses in the flow channel. Ground personnel detect and decode these pulses to obtain detection data.

[0082] It can generate pulses within the drill bit. In this embodiment, the power mechanism 3224 is a linear motor, which is electrically connected to the power supply unit 323. The linear motor can drive the pulse piston 3223 to reciprocate under the control of an external control system.

[0083] In a preferred embodiment, a piston rod 3214 is movably inserted into the piston cylinder 3212. The piston rod 3214 extends out of the piston cylinder 3212 and connects to the guide joint 3211. The front end of the piston rod 3214 is connected to a spring pin 3215 that passes through the side wall of the piston cylinder 3212. The spring pin 3215 can move radially under the action of the piston rod 3214, extending or retracting from 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 embodiment, the piston rod 3214 includes a first connecting segment 32141, a second connecting segment 32142 and a third connecting segment 32143 that are integrally connected, and a first limiting step is formed at the connection between the first connecting segment 32141 and the second connecting segment 32142.

[0085] A compression spring 3216 is fitted on the first connecting section 32141. The front end of the compression spring 3216 abuts against the rear end face of the second connecting 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 move axially backward, thereby pulling the pull rope 3218 and causing the spring pin 3215 to retract radially, thereby separating the non-magnetic short section outer tube 31 from the retrievable wireless measurement-while-drilling instrument assembly 32. After the compression spring 3216 rebounds, the piston rod 3214 can move axially forward, causing the spring pin 3215 to extend radially out of the piston cylinder 3212 and into the pin groove.

[0086] A sealing ring 3217 is also fitted 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] In a preferred embodiment, the guide joint 3211 includes an integrally connected hook body 32111 and a mounting section 32112. The mounting section 32112 has an axially oriented mounting hole, and a first connecting section 32141 extends from the piston cylinder 3212 into the mounting hole. The hook body 32111 can cooperate with a retrieval tool lowered into the drill string, enabling the retrieval tool to extract the retrievable wireless measurement-while-drilling instrument assembly using the hook body.

[0088] As a preferred embodiment, the inner wall of the non-magnetic short section outer tube 31 is provided with a pin groove that can be inserted and engaged with the spring pin 3215; the spring pin 3215 and the piston rod 3214 are connected by a pull rope 3218.

[0089] As a preferred embodiment, the measuring probe 324 is equipped with an acceleration sensor module, a temperature sensor module, a magnetic sensor module, a microcontroller module, a storage module, and a power supply module.

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

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

[0092] The accelerometer is used to collect triaxial acceleration data of the drill bit and transmit the collected data to the storage module. The temperature sensor module is used to collect fluid temperature data and transmit the collected data to the storage module. The magnetic sensor module is used to collect geomagnetic field strength data at the location of the drill bit 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.

[0093] In other embodiments, other existing logging modules may be installed within the measuring probe 324 as needed to collect other data that requires acquisition.

[0094] As a preferred embodiment, the hollow screw motor section 2 includes a screw motor section outer tube 21 and a rotor 22 passing through the screw motor section outer tube 21, forming a second flow channel between the screw motor section outer tube 21 and the rotor 22; the rotor 22 has an inner hole through it.

[0095] In a preferred embodiment, the planetary connector 325 includes a sleeve 3251 with an open rear end. The rear end of the sleeve 3251 is fitted onto the measuring probe 324. A T-shaped rod 3252 passes through 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 rearward 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 extends out of the sleeve 3251 and connects to a rubber plug 3254 disposed outside the sleeve 3251. The rubber plug 3254 can seal with the inner hole. Preferably, the front end of the rubber plug 3254 has a chamfer to facilitate its entry into the inner hole. The sleeve 3251, T-shaped rod 3252, stop block 3253, and rubber plug 3254 are all made of non-magnetic material.

[0096] As a preferred 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, with the second cylindrical section 32233 connected to the power mechanism 3224.

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

[0098] When in use, first insert the assembled reusable wireless measurement while drilling instrument assembly 32 into the non-magnetic short section outer tube 31, and the spring pin 3215 enters the pin groove on the inner wall of the non-magnetic short section outer tube 31 to achieve overall positioning of the reusable wireless measurement while drilling instrument assembly 32, and the rubber plug 3254 is sealed to the inner hole. During drilling, the fluid delivered from the water supply unit 5 passes through the interconnected third, fourth, fifth, sixth, second, and first flow channels and is ejected from the directional drill bit 1 to achieve drilling. After drilling is completed, before lowering the screen pipe, a retrieval tool is lowered and connected to the guide joint 3211. Under the action of the retrieval 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, pulling the pull rope 3218, which in turn drives the spring pin 3215 to retract radially, separating the retrievable wireless measurement-while-drilling instrument assembly 32 from the non-magnetic short section outer tube 31. The retrieval tool can then remove the retrievable wireless measurement-while-drilling instrument assembly 32, and then the screen pipe can be lowered into the drill string, allowing it to enter the borehole through the channels in the drill string.

[0099] Example 2

[0100] This embodiment provides a wireless measurement-while-drilling (MWD) directional drilling and support method, implemented using the wireless MWD directional drilling and support drill string provided in Embodiment 1, including the following steps:

[0101] Step 1: Complete the assembly of the reusable wireless measurement while drilling instrument assembly;

[0102] Step 2: Install the retrievable wireless measurement while drilling instrument assembly into the non-magnetic short section outer tube, so that the spring pin enters the pin groove, and complete the axial positioning of the retrievable wireless measurement while drilling instrument assembly.

[0103] Step 3: Connect the directional drill bit, hollow screw motor and hollow non-magnetic short section in sequence, so that the rubber plug enters the inner hole of the rotor, connect the drill rod and water feeder, and complete the assembly of the wireless measurement-while-drilling directional drilling support tool.

[0104] Step 4: Conduct directional drilling according to the borehole design trajectory. During directional drilling, when the designed measurement point is reached, start the power mechanism to drive the pulse piston to reciprocate in the pulse chamber to close or open the second flow hole, generating pressure pulses inside the drill bit. The measurement data collected by the measuring probe is sent to the external control system in the form of pulses to complete the measurement data acquisition. After drilling to the target hole depth, stop construction and complete the hole washing operation.

[0105] Step 5: Disassemble the water supply device; lower the retrieval device to retrieve the guide head, causing the spring pin to retract and separate the retrievable wireless measurement-while-drilling instrument assembly from the non-magnetic short section outer tube; lift out the wireless measurement-while-drilling instrument assembly.

[0106] Step 6: Insert the screen pipe into the drill pipe. The screen pipe enters the borehole through the wireless measurement-while-drilling directional drilling tool.

[0107] Step 7: The drill pipe, non-magnetic short section outer tube, hollow screw motor short section, and open / close drill bit are pulled out in sequence.

[0108] Step 8: Seal the hole and continue pulling.

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

[0110] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

Claims

1. A wireless measurement-while-drilling directional drilling support tool, characterized in that, It includes a directional drill bit (1), a hollow screw motor section (2), a hollow non-magnetic section (3), a drill rod (4), and a water feeder (5) arranged sequentially from front to back, with a pressure sensor connected to the water feeder (5); The directional drill bit (1) is provided with a first flow channel; the hollow screw motor section (2) is provided with a second flow channel; The hollow non-magnetic sub (3) includes a non-magnetic sub outer tube (31) and a retrievable wireless measurement while drilling instrument assembly (32) sleeved in the non-magnetic sub outer tube (31). The retrievable wireless measurement-while-drilling instrument assembly (32) includes a retrieval unit (321), a pulse generator (322), a power supply unit (323), a measuring probe (324), and a planetary connector (325) arranged sequentially from back to front. A third flow channel is formed between the retrieval unit (321) and the non-magnetic short section outer tube (31); a fourth flow channel is formed between the power supply unit (323) and the non-magnetic short section outer tube (31); a fifth flow channel is formed between the measuring probe (324) and the non-magnetic short section outer tube (31); and a sixth flow channel is formed between the planetary connector (325) and the non-magnetic short section outer tube (31). The first, second, third, fourth, fifth, and sixth overcurrent channels are connected together. The recycling unit (321) includes a guide joint (3211), a piston cylinder (3212), and a conversion joint (3213) that are coaxially connected; the conversion joint (3213) has a first flow hole (32131) on its side wall, which is used to connect a third flow channel and a first flow cavity (32132) provided in the conversion joint (3213). The pulse generator (322) includes a pulse generator housing (3221). A second flow hole (32212) communicating with the first flow cavity (32132) is provided on the inner rear end face of the pulse generator housing (3221). A pulse chamber (32211) is provided inside the pulse generator housing (3221). The second flow hole (32212) communicates with the pulse chamber (32211). A fixing ring (3222) is sleeved on one end of the pulse chamber (32211) near the power supply unit (323). A third flow hole (32221) communicating with the pulse chamber (32211) and the fourth flow channel is provided on the side wall of the fixing ring (3222). A pulse piston (3223) is provided inside the pulse chamber (32211). A power mechanism (3224) is driven to the front end of the pulse piston (3223). The front end of the power mechanism (3224) is connected to the measuring probe (324). The pulse piston (3223) can reciprocate along the axial direction inside the pulse chamber (32211) under the drive of the power mechanism (3224) to close or open the second flow hole (32212). A piston rod (3214) is movably inserted inside the piston cylinder (3212). The piston rod (3214) extends out of the piston cylinder (3212). The front end of the piston rod (3214) is connected to a spring pin (3215) that passes through the side wall of the piston cylinder (3212). The spring pin (3215) can move radially under the drive of the piston rod (3214). The inner wall of the non-magnetic short section outer tube (31) is provided with a pin groove that can be inserted and engaged with the spring pin (3215); the spring pin (3215) and the piston rod (3214) are connected by a pull rope (3218); The guide joint (3211) is lowered into the retrieval device, which drives the spring pin (3215) to retract, thereby separating the retrievable wireless drilling measurement instrument assembly (32) from the non-magnetic short section outer tube (31).

2. The wireless measurement-while-drilling directional drilling tool as described in claim 1, characterized in that, The piston rod (3214) includes a first connecting section (32141), a second connecting section (32142), and a third connecting section (32143) that are integrally connected. A first limiting step is formed at the connection between the first connecting section (32141) and the second connecting section (32142). A compression spring (3216) is sleeved on the first connecting section (32141). The front end of the compression spring (3216) is in contact with the rear end face 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 fitted 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).

3. The wireless measurement-while-drilling directional drilling support tool as described in claim 2, characterized in that, The guide joint (3211) includes an integrated hook body (32111) and an installation section (32112). An installation hole is provided in the installation section (32112) along the axial direction. The rear end of the first connecting section (32141) passes through the piston cylinder (3212) and extends into the installation hole.

4. The wireless measurement-while-drilling directional drilling support tool as described in claim 1, characterized in that, The measuring probe (324) is equipped 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, temperature sensor module, magnetic sensor module, and microcontroller module, respectively. The power supply module is connected to the acceleration sensor module, temperature sensor module, magnetic sensor module and transmission module respectively; The accelerometer is used to collect triaxial acceleration data of the drill bit and transmit the collected data to the storage module. The temperature sensor module is used to collect fluid temperature data and transmit the collected data to the storage module. The magnetic sensor module is used to collect geomagnetic field strength data at the location of the drill bit 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 an external control system and is used to transmit the received data to the external control system.

5. The wireless measurement-while-drilling directional drilling support tool as described in claim 1, characterized in that, The hollow screw motor section (2) includes a screw motor section outer tube (21) and a rotor (22) passing through the screw motor section outer tube (21). The second flow channel is formed between the screw motor section outer tube (21) and the rotor (22). An inner hole is provided through the rotor (22).

6. The wireless measurement-while-drilling directional drilling support tool as described in claim 5, characterized in that, The planetary connector (325) includes a sleeve (3251) with an open rear end. The rear end of the sleeve (3251) is fitted onto the measuring probe (324). A T-shaped rod (3252) is inserted inside 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 front end of the T-shaped rod (3252) extends out of the sleeve (3251) and is connected to a rubber plug (3254) disposed outside the sleeve (3251). The rubber plug (3254) can be sealed to the inner hole.

7. The wireless measurement-while-drilling directional drilling support tool as described in claim 1, characterized in that, 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) being connected to the power mechanism (3224); The first flow passage (32131) includes a cylindrical hole and a frustum-shaped hole connected together, and the outer contour of the frustum-shaped sealing section (32231) matches the inner contour of the frustum-shaped hole.

8. A wireless measurement-while-drilling method for directional drilling and hole support, characterized in that, This method is implemented using the wireless measurement-while-drilling directional drilling tool as described in claim 6, and includes the following steps: Step 1: Complete the assembly of the reusable wireless measurement while drilling instrument assembly; Step 2: Install the retrievable wireless measurement while drilling instrument assembly into the non-magnetic short section outer tube, so that the spring pin enters the pin groove, and complete the axial positioning of the retrievable wireless measurement while drilling instrument assembly. Step 3: Connect the directional drill bit, hollow screw motor and hollow non-magnetic short section in sequence, so that the rubber plug enters the inner hole of the rotor, connect the drill rod and water feeder, and complete the assembly of the wireless measurement-while-drilling directional drilling support tool. Step 4: Conduct directional drilling according to the borehole design trajectory. During the directional drilling process, when the designed measurement point is reached, 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 measuring probe to the external control system in the form of pulses to complete the measurement data acquisition. After drilling to the target hole depth, stop the construction and complete the hole washing operation. Step 5: Disconnect the water supply device; lower the retrieval device to take the guide joint, causing the spring pin to retract, thus separating the retrievable wireless measurement-while-drilling instrument assembly from the non-magnetic short section outer tube; lift out the wireless measurement-while-drilling instrument assembly. Step 6: Insert the screen pipe into the drill pipe. The screen pipe enters the borehole through the wireless measurement-while-drilling directional drilling tool. Step 7: Pull out the drill pipe, non-magnetic short section outer tube, hollow screw motor short section, and open / close drill bit in sequence; Step 8: Seal the hole and continue pulling.

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