Near-bit measurement-while-drilling nipple based on eccentric water hole

Abstract

The utility model provides a near-bit measurement-while-drilling nipple based on an eccentric water hole. The near-bit measurement-while-drilling nipple structurally comprises an outer pipe, an electronic bin framework, a wireless transmitting nipple, a battery assembly, a gamma measurement module, an inclination angle measurement module and a measurement circuit board. The electronic bin framework is fixed in the outer pipe, the battery assembly, the gamma module and the inclination angle module are annularly arranged, near-bit track and geological parameter measurement is achieved, and occupied space is reduced. One end of the wireless transmitting short section is connected with the outer pipe through straight threads, and the other end is connected to the screw motor through taper threads. The wireless transmitting short section transmits measurement data through wireless signals, and transmission of the measurement data across the screw motor is achieved. The intrinsic safety type circuit design ensures that the explosion-proof requirement of a coal mine is met. The device is compact in structure, meets the requirement of small-diameter drilling of a coal mine, and realizes high-precision and real-time measurement and stable data transmission.

Description

Technical Field

[0001] The utility model belongs to the technical field of downhole measurement-while-drilling instruments in coal mines, and relates to a near-bit measurement-while-drilling sub based on eccentric water holes. Background Technique

[0002] The downhole measurement-while-drilling technology in coal mines is a key component of coal mine directional drilling equipment. It is mainly used to monitor the borehole trajectory, geological parameters, and drilling engineering parameters in real time. Through these data, operators can adjust the drilling trajectory of the drill rig in a timely manner according to the changes during the drilling process, so as to ensure that the borehole accurately reaches the designated position. This is particularly important in coal mine exploitation, especially when it is necessary to drill through complex geological layers. Precise control of the borehole path helps to improve the exploitation efficiency and safety. However, the existing measurement-while-drilling technology has some obvious limitations.

[0003] Most traditional downhole measurement-while-drilling systems in coal mines are installed in non-magnetic drill pipes behind the positive displacement motor, usually at a distance of 5 to 8 meters from the bit. A major problem brought about by this design is measurement lag. That is, while the drill rig is drilling at the front end, there is a large distance between the measurement point and the actual position of the bit, resulting in the trajectory data collected being unable to reflect the actual working conditions of the bit in real time. This lag will cause untimely trajectory adjustment, which may lead to the borehole deviating from the designed route, increasing the operation risk and engineering complexity. Especially in areas where the coal and rock layers change frequently, the existing systems are difficult to provide accurate real-time data.

[0004] At present, near-bit measurement-while-drilling devices have been developed in the surface oil field, but they are mostly used for large-diameter boreholes in oil drilling. These devices have characteristics such as large diameter and long length, and cannot be directly applied to small-diameter directional boreholes in coal mines. The main reasons are: first, the near-bit measurement-while-drilling devices developed in the oil field do not meet the special explosion-proof requirements in coal mines; second, they generally have large diameters and are too long, not meeting the requirements of small-diameter directional boreholes in coal mines and seriously affecting the build-up rate of the positive displacement motor. Content of the Utility Model

[0005] In view of this, the purpose of the utility model is to solve the problems that the measurement point of the existing downhole measurement-while-drilling system in coal mines lags behind and cannot measure the borehole trajectory and geological parameters in a timely manner, and to provide a near-bit measurement-while-drilling sub based on eccentric water holes.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A near-bit measurement sub based on an eccentric water hole, comprising an outer pipe, a wireless transmission sub, a battery assembly, a gamma measurement module, an inclination measurement module, and a measurement circuit board; one end of the wireless transmission sub is connected to one end of the outer pipe through a straight thread, and the other end of the wireless transmission sub is provided with a taper thread for connecting a positive displacement motor; the other end of the outer pipe is provided with a connecting thread for connecting a drill bit; an electronic chamber skeleton is arranged inside the outer pipe, one end of the electronic chamber skeleton is connected to the end face of the connecting thread of the outer pipe, and the other end is connected to the wireless transmission sub, so as to be fixed inside the outer pipe;

[0008] On the outer circle of the electronic chamber skeleton, a waist-shaped groove is provided on one side, and three arc-shaped grooves evenly distributed in the circumferential direction are provided on the other side. There is a water hole in the middle of the electronic chamber skeleton that is eccentric with the center of the outer pipe; the battery assembly is in a waist shape and is fixedly arranged in the waist-shaped groove; the gamma measurement module, the inclination measurement module, and the measurement circuit board are respectively arranged in the three arc-shaped grooves, so that the battery assembly, the gamma measurement module, the inclination measurement module, and the measurement circuit board are annularly arranged on the electronic chamber skeleton;

[0009] A communication hole is arranged inside the wireless transmission sub for installing connecting wires between the wireless transmission sub and the battery assembly, the gamma measurement module, the inclination measurement module, and the measurement circuit board; the connection circuit between the wireless transmission sub, the battery assembly, the gamma measurement module, the inclination measurement module, and the measurement circuit board is an intrinsically safe circuit; the measurement data of the gamma measurement module and the inclination measurement module are transmitted through the wireless transmission sub in a wireless signal manner.

[0010] Furthermore, the wireless transmission sub includes a wireless transmission joint, a protective cover, and a transmitting antenna assembly; a through hole communicating with the water hole of the electronic chamber skeleton is arranged in the middle of the wireless transmission joint, and the wireless transmission joint is connected to one end of the outer pipe through a thread; the communication hole is arranged inside the wireless transmission joint, the transmitting antenna assembly is arranged in an annular groove, and the protective cover is sleeved on the wireless transmission joint to cover the transmitting antenna assembly inside; a plurality of strip-shaped holes are evenly distributed in the circumferential direction on the protective cover as channels for wireless signal transmission.

[0011] Furthermore, a fixing ring is arranged at one end of the protective cover away from the outer pipe. The fixing ring is composed of two halves, the fixing ring is clamped on the wireless transmission joint, and the protective cover is sleeved on the fixing ring and supported by the fixing ring.

[0012] Furthermore, the communication hole includes a horizontal hole arranged axially and an inclined hole arranged obliquely. An aviation plug assembly is arranged in the inclined hole, and the aviation plug assembly is used for electrical connection and sealing the inclined hole.

[0013] Furthermore, a gap is arranged between the transmitting antenna assembly and the protective cover, and the gap is filled with a sealing material.

[0014] Furthermore, vibration damping and sealing gaskets are provided on the radial direction and both ends of the battery assembly, gamma measurement module, inclination measurement module, and measurement circuit board to prevent vibration at the bottom of the hole from damaging electronic components.

[0015] Preferably, the structural components of the outer pipe, wireless transmission sub, battery assembly, gamma measurement module, inclination measurement module, and measurement circuit board are all made of non-magnetic steel material to reduce magnetic interference and ensure the accuracy of measurement data.

[0016] The beneficial effects of the present utility model are as follows:

[0017] 1. The present utility model sets the measurement sub at a position less than 0.5 meters from the end of the drill bit, greatly shortening the distance between the measurement point while drilling and the drill bit. Compared with the traditional measurement while drilling system that needs to be installed in the non-magnetic drill pipe 5 to 8 meters away from the drill bit, the present utility model can monitor the trajectory and geological parameters during the drilling process in real time, significantly reducing the problem of lag in measurement data. This can help the operator more accurately adjust the drilling trajectory, improve the automation and intelligent control accuracy of directional drilling, and thus enhance the safety and efficiency of underground coal mine drilling operations.

[0018] 2. By optimizing the structures of the outer pipe and the electronic chamber skeleton, the present utility model significantly reduces the diameter and length of the measurement while drilling sub, enabling it to adapt to the narrow drilling space in underground coal mines. At the same time, the small-diameter design of the present utility model also reduces the impact on the inclination ability of the positive displacement motor, ensuring the smooth operation of the directional drilling equipment.

[0019] 3. By arranging the gamma measurement module, inclination measurement module, measurement circuit board, and battery assembly in a ring outside the electronic chamber skeleton, the present utility model makes full use of the internal space and achieves structural compactness. This design not only effectively reduces the overall size of the equipment but also improves the system integration degree. At the same time, the ring-shaped battery assembly increases the battery capacity and extends the endurance time of the equipment, ensuring the continuous and stable operation of the measurement while drilling system during long-term drilling operations.

[0020] 4. The present utility model adopts an intrinsically safe circuit design to ensure the safety of the measurement while drilling device in the complex environment of coal mines. The intrinsically safe circuit can effectively prevent electrical equipment from generating sparks or overheating in case of failure, thus avoiding the occurrence of explosion accidents in underground coal mines and enhancing the safety of the equipment in explosive environments.

[0021] 5. The utility model adopts a wireless transmission sub - section structure, which solves the problem of transmitting measurement data across the screw motor. It can transmit the data collected by the gamma measurement module and the dip angle measurement module to the receiving sub - section behind the screw motor in real - time through wireless signals. The transmitting antenna assembly is embedded in the annular groove of the sub - section and is protected by a protective cover and sealing materials, ensuring the stability and reliability of wireless signal transmission. This optimized design is not only used for waterproofing but also reduces the risk of damage caused by vibration and friction of coal and rock strata.

[0022] 6. The utility model is provided with vibration - damping and sealing gaskets at both ends of the battery assembly, gamma measurement module, dip angle measurement module, and measurement circuit board, which can effectively absorb the vibration impact during drilling, protect the internal precision electronic components, and extend the service life of the equipment.

[0023] Other advantages, objectives, and features of the utility model will be elaborated to some extent in the subsequent description. And to some extent, they will be obvious to those skilled in the art based on the study of the following text, or can be learned from the practice of the utility model. The objectives and other advantages of the utility model can be achieved and obtained through the following description. Brief Description of the Drawings

[0024] In order to make the objectives, technical solutions, and advantages of the utility model clearer, the utility model will be described in detail and preferably with reference to the accompanying drawings, where:

[0025] Figure 1 is the overall schematic diagram of the near - bit measurement while drilling sub - section based on eccentric water holes in the utility model.

[0026] Figure 2 is the cross - sectional schematic diagram of the electronic bin in the utility model.

[0027] Reference Numerals: 1 - outer tube; 2 - electronic bin; 201 - electronic bin skeleton; 202 - battery assembly; 203 - water - passing hole; 204 - battery fixing seat; 205 - gamma measurement module; 206 - vibration - damping pad; 207 - combined vibration - damping pad; 208 - annular vibration - damping pad; 209 - dip angle measurement module; 210 - vibration - damping pad; 211 - measurement circuit board; 212 - measurement circuit board mounting seat; 3 - wireless transmission sub - section; 301 - straight thread; 302 - communication hole; 303 - transmitting antenna assembly; 304 - fixing ring; 305 - taper thread. Detailed Description of the Embodiment

[0028] The following describes the embodiments of the present utility model through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model. It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present utility model in a schematic manner. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0029] Among them, the drawings are only for illustrative purposes, showing only schematic diagrams rather than physical diagrams, and should not be construed as a limitation to the present utility model; in order to better illustrate the embodiments of the present utility model, some components in the drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0030] In the drawings of the embodiments of the present utility model, the same or similar reference numerals correspond to the same or similar components; in the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present utility model 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. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and should not be construed as a limitation to the present utility model. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] Please refer to Figures 1-2 , which is a near-bit measurement sub based on eccentric water holes, including an outer pipe 1, a wireless transmission sub 3, a battery assembly 202, a gamma measurement module 205, an inclination measurement module 209, and a measurement circuit board 211; one end of the wireless transmission sub 3 is connected to one end of the outer pipe 1 through a straight thread 301, and the other end of the wireless transmission sub 3 is provided with a taper thread 305 for connecting a positive displacement motor; the other end of the outer pipe 1 is provided with a connection thread for connecting a drill bit; an electronic chamber skeleton 201 is arranged inside the outer pipe 1, one end of the electronic chamber skeleton 201 is connected to the connection thread end face of the outer pipe 1, and the other end is connected to the wireless transmission sub 3, so as to be fixed inside the outer pipe 1; an electronic chamber 2 is formed between the electronic chamber skeleton 201 and the inner wall of the outer pipe 1;

[0032] On the outer circle of the electronic bin skeleton 201, a waist-shaped groove is provided on one side, and three circumferentially evenly distributed arc-shaped grooves are provided on the other side. There is a water passing hole 203 in the middle of the electronic bin skeleton 201 that is eccentric with the center of the outer tube 1; the battery assembly 202 is waist-shaped and is fixedly installed in the waist-shaped groove through the battery fixing seat 204; the measurement circuit board 211 is installed in one of the arc-shaped grooves through the measurement circuit board mounting seat 212, and the gamma measurement module 205 and the inclination measurement module 209 are respectively installed in the other two arc-shaped grooves, so that the battery assembly 202, the gamma measurement module 205, the inclination measurement module 209, and the measurement circuit board 211 are arranged in a ring on the electronic bin skeleton 201.

[0033] A communication hole 302 is provided in the wireless transmission sub-joint 3 for installing the connecting wires between the wireless transmission sub-joint 3 and the battery assembly 202, the gamma measurement module 205, the inclination measurement module 209, and the measurement circuit board 211; the connection circuit between the wireless transmission sub-joint 3, the battery assembly 202, the gamma measurement module 205, the inclination measurement module 209, and the measurement circuit board 211 is an intrinsically safe circuit; the measurement data of the gamma measurement module 205 and the inclination measurement module 209 are transmitted out in the form of wireless signals through the wireless transmission sub-joint 3.

[0034] Among them, the structural parts of the outer tube, the wireless transmission sub-joint, the battery assembly, the gamma measurement module, the inclination measurement module, and the measurement circuit board are all made of non-magnetic steel materials.

[0035] The wireless transmission sub-joint 3 includes a wireless transmission joint, a protective cover, and a transmitting antenna assembly 303; a through hole communicating with the water passing hole 203 of the electronic bin skeleton 201 is provided in the middle of the wireless transmission joint, and the wireless transmission joint is threadedly connected to one end of the outer tube 1; the communication hole 302 is provided in the wireless transmission joint, the transmitting antenna assembly 303 is provided in the annular groove, and the protective cover is sleeved on the wireless transmission joint to cover the transmitting antenna assembly 303 therein; a plurality of strip-shaped holes are evenly distributed on the circumference of the protective cover as the channels for wireless signal transmission.

[0036] A fixing ring 304 is provided at one end of the protective cover away from the outer tube 1. The fixing ring 304 is composed of two halves. The fixing ring 304 is clamped on the wireless transmission joint, and the protective cover is sleeved on the fixing ring 304 and supported by the fixing ring 304.

[0037] The communication hole 302 includes a horizontal hole arranged axially and an inclined hole arranged obliquely. An aviation plug assembly is provided in the inclined hole, and the aviation plug assembly is used for electrical connection and sealing the inclined hole.

[0038] A gap is provided between the transmitting antenna assembly 303 and the protective cover, and the gap is filled with sealing material.

[0039] Vibration damping pads 206, vibration damping pads 210, combined vibration damping pads 207, and annular vibration damping pads 208 are respectively arranged at the radial direction and both ends of the battery assembly 202, gamma measurement module 205, inclination measurement module 209, and measurement circuit board 211 to prevent vibration at the bottom of the hole from damaging electronic components.

[0040] The assembly process of the near-bit measurement sub with eccentric water holes in this embodiment includes the following steps:

[0041] Step 1, preparation before assembly: Check the integrity of components: Ensure that all components, including the outer pipe 1, wireless transmission sub 3, battery assembly 202, gamma measurement module 205, inclination measurement module 209, measurement circuit board 211, electronic bin skeleton 201, transmitting antenna assembly 303, protective cover, fixing ring 304, and vibration damping and sealing pads are complete and undamaged; Prepare the required tools, torque wrench, thread sealant, insulating tape, and sealing materials;

[0042] Step 2, installation of electronic components: Insert the electronic bin skeleton 201 into the outer pipe 1 so that one end fits against the connecting thread end face of the outer pipe 1 and the other end is connected to the wireless transmission sub 3;

[0043] Installation of the battery assembly 202: Embed the waist-shaped battery assembly 202 into the waist-shaped groove on the electronic bin skeleton 201, and install the gamma measurement module 205, inclination measurement module 209, and measurement circuit board 211 into the 3 equally distributed arc-shaped grooves on the electronic bin skeleton 201 respectively and arrange them in a circular pattern; Use wires to connect the battery assembly 202, gamma measurement module 205, inclination measurement module 209, and measurement circuit board 211 in sequence; Install vibration damping and sealing pads at the radial direction and both ends of the battery assembly 202, gamma measurement module 205, inclination measurement module 209, and measurement circuit board 211 to ensure firm fixation;

[0044] Step 3, installation of the wireless transmission sub 3: Connect the wireless transmission sub 3 to one end of the outer pipe 1 through the straight thread 301 and tighten it with a torque wrench to the specified torque; Pass the communication wire through the communication hole 302 in the wireless transmission sub 3 and connect it to the aviation plug assembly; Insert the aviation plug assembly into the inclined hole of the wireless transmission sub 3 and tighten it to seal the inclined hole to ensure the protection performance;

[0045] Step 4, installation of the transmitting antenna assembly 303 and the protective cover: Embed the transmitting antenna assembly 303 into the annular groove of the wireless transmission sub 3; Clamp the two halves of the fixing ring 304 on the wireless transmission joint, fix the protective cover on the fixing ring 304, and set the protective cover on the wireless transmission joint so that the transmitting antenna assembly 303 is completely covered therein;

[0046] Step Five, Sealing Treatment: Fill the gap between the transmitting antenna assembly 303 and the protective cover with a sealing material to ensure the stability of wireless signal transmission and the protection performance.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the present technical solution, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A near-bit measurement while drilling sub based on eccentric water holes, characterized in that: It includes an outer pipe, a wireless transmission sub, a battery assembly, a gamma measurement module, an inclination measurement module, and a measurement circuit board. One end of the wireless transmission sub is connected to one end of the outer pipe by a straight thread, and the other end of the wireless transmission sub is provided with a taper thread for connecting a positive displacement motor. The other end of the outer pipe is provided with a connecting thread for connecting a drill bit. An electronic chamber skeleton is arranged inside the outer pipe. One end of the electronic chamber skeleton is connected to the end face of the connecting thread of the outer pipe, and the other end is connected to the wireless transmission sub, thereby being fixed inside the outer pipe. On the outer circle of the electronic chamber skeleton, there is a waist-shaped groove on one side and three arc-shaped grooves evenly distributed in a circle on the other side. There is a water passing hole eccentric to the center of the outer pipe in the middle of the electronic chamber skeleton. The battery assembly is in a waist shape and is fixedly arranged in the waist-shaped groove. The gamma measurement module, the inclination measurement module, and the measurement circuit board are respectively arranged in the three arc-shaped grooves, so that the battery assembly, the gamma measurement module, the inclination measurement module, and the measurement circuit board are arranged in a ring on the electronic chamber skeleton. A communication hole is arranged inside the wireless transmission sub for installing connection wires between the wireless transmission sub and the battery assembly, the gamma measurement module, the inclination measurement module, and the measurement circuit board. The connection circuit between the wireless transmission sub, the battery assembly, the gamma measurement module, the inclination measurement module, and the measurement circuit board is an intrinsically safe circuit. The measurement data of the gamma measurement module and the inclination measurement module are transmitted out in the form of wireless signals through the wireless transmission sub.

2. The near-bit measurement while drilling sub based on an eccentric water hole according to claim 1, wherein: The wireless transmission sub includes a wireless transmission joint, a protective cover, and a transmitting antenna assembly. A through hole communicating with the water passing hole of the electronic chamber skeleton is arranged in the middle of the wireless transmission joint, and the wireless transmission joint is connected to one end of the outer pipe by a thread. The communication hole is arranged inside the wireless transmission joint. The transmitting antenna assembly is arranged in an annular groove, and the protective cover is sleeved on the wireless transmission joint, covering the transmitting antenna assembly inside. A plurality of strip-shaped holes are evenly distributed in a circle on the protective cover as channels for wireless signal transmission.

3. The near-bit measurement sub while drilling based on eccentric water holes according to claim 2, characterized in that: A fixing ring is arranged at the end of the protective cover away from the outer pipe. The fixing ring is composed of two halves, and the fixing ring is clamped on the wireless transmission joint. The protective cover is sleeved on the fixing ring and is supported by the fixing ring.

4. The near-bit measurement while drilling sub based on an eccentric water hole according to claim 2, characterized in that: The communication hole includes a horizontal hole arranged axially and an inclined hole arranged obliquely. A pin header assembly is arranged in the inclined hole, and the pin header assembly is used for electrical connection and sealing the inclined hole.

5. The near-bit measurement while drilling sub based on an eccentric water hole according to claim 2, wherein: A gap is arranged between the transmitting antenna assembly and the protective cover, and the gap is filled with a sealing material.

6. The near-bit measurement while drilling sub based on eccentric water holes according to claim 1, characterized in that: Vibration damping and sealing gaskets are arranged radially and at both ends of the battery assembly, the gamma measurement module, the inclination measurement module, and the measurement circuit board to prevent vibration at the bottom of the hole from damaging electronic components.

7. The near-bit measurement sub while drilling based on eccentric water holes according to claim 1, wherein: The structural parts of the outer pipe, the wireless transmission sub, the battery assembly, the gamma measurement module, the inclination measurement module, and the measurement circuit board are all made of non-magnetic steel material.

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