WO2024041667A1

WO2024041667A1 - Multi-parameter measurement-while-drilling system for underground coal mines, and measurement method

Info

Publication number: WO2024041667A1
Application number: PCT/CN2023/120604
Authority: WO
Inventors: 李泉新; 杨冬冬; 陈龙; 张冀冠; 陈翔; 冯建宇
Original assignee: 中煤科工西安研究院(集团)有限公司
Priority date: 2022-08-24
Filing date: 2023-09-22
Publication date: 2024-02-29
Also published as: CN115434694A

Abstract

A multi-parameter measurement-while-drilling system for underground coal mines, and a measurement method. The system is provided with a measurement tube (1), and a main control board assembly (3), a vibration measurement assembly (4) and a data collection assembly (5) are successively embedded in the axial direction in the outer wall of the measurement tube (1); the vibration measurement assembly (4) measures the vibration frequency and amplitude of a drilling tool and the washing fluid pressure outside the measurement tube, and the vibration measurement assembly (4) also serves as a control switch of the data collection assembly (5) and the main control board assembly (3); the data collection assembly (5) collects measured data of the vibration measurement assembly (4), and simultaneously the data collection assembly (5) collects the rotation speed of the drilling tool and the washing fluid pressure inside the measurement tube; the main control board assembly (3) is integrated with an inclination measuring module for measuring dynamic pose data and static pose data of the drilling tool, and encodes and modulates the pose data of the drilling tool and the data collected by the data collection assembly. The system can measure drilling pressure and torque data at different positions in the circumferential direction, which truly reflects the stress state of each position of in-hole drilling tools, thus effectively preventing accidents such as drilling tool sticking and drilling tool dropping during the construction process.

Description

A multi-parameter measurement while drilling system and measurement method in coal mines

Technical field

The invention belongs to the technical field of engineering parameter measurement while drilling, and relates to an underground coal mine multi-parameter measurement while drilling system and a measurement method.

Background technique

In the process of underground drilling in coal mines, currently, for directional drilling, drilling attitude data is mainly obtained from the display and related drilling parameters such as torque, feed pressure and pull-out pressure are obtained from the drilling rig instrument. However, for conventional drilling, the current Basically, some drilling parameters such as rotation speed, torque, feed pressure and pull-out pressure can only be obtained from the drilling rig instrument or drilling rig operation. None of them can directly reflect the torque, bit weight, internal and external annulus of the bottom drilling tool during the drilling process. Drilling parameters such as pressure, rotation speed, vibration, temperature, etc. Regardless of whether conventional drilling or directional drilling is performed, these drilling parameters are important indicators for achieving safe and efficient underground drilling operations. With the deepening of drilling depth and the increase of drilling hole diameter, drilling accidents such as stuck drill, dropped drill, and instrument damage occur frequently. Most of the accidents are not instantaneous and are basically due to the knowledge of the situation in the hole during the construction process. It rarely leads to the inability to make accurate predictions. Therefore, by accurately measuring multiple parameters of the drilling tools in the hole in real time, the drilling process can be analyzed, judged, and processed, and then the entire drilling process can be guided, thereby achieving risk-free drilling.

During the drilling process, the interaction conditions between the drilling tool and the well wall are complex. The attenuation trend of the torque and bit pressure exerted by the drilling rig on the drilling tool and the drilling pressure during the transmission process are greatly affected by factors such as well wall friction, drilling regularity, geological conditions, etc. , the data displayed by the hole instrument is not the actual stress on the drilling tool behind the drill bit. With the use of precision instruments during the drilling process, there are also certain requirements for the vibration of drilling tools and the temperature inside the hole. If the temperature is too high and the vibration is strong for a long time, the instrument is easily damaged. However, currently there is no instrument that can Displays data such as temperature and vibration. And currently, the flushing fluid pressure in the hole is generally known based on the pressure indication number on the mud pump truck, and it is impossible to monitor the flushing fluid pressure changes inside the drilling tool and the drilling annulus in real time. In short, due to the inaccuracy, lag, and single display of instrument measurement data, it cannot fundamentally reflect the true stress state of the drilling tool in the hole and the environmental characteristics of the environment. Abnormalities in any parameter may lead to accidents. occur.

And during the construction process, the changes of the well inclination and azimuth angle with the well body should be understood at any time, so as to better monitor and adjust the well trajectory to extend as much as possible along the designed trajectory. In addition, by monitoring the changes of well inclination and orientation with the well body, the curvature of the wellbore can be calculated and the "dog leg" can be reasonably controlled to prevent the occurrence of underground accidents. At present, mine measurement while drilling systems generally use three-axis accelerometers and three-axis magnetometers to measure well inclination and azimuth. Static measurement is required after drilling is stopped, which can accurately reflect the drill tool attitude data at a certain time point after the completion of the construction of a single drill pipe. However, during the construction process, the measurement module is affected by the vibration, impact and rotation of the drill tool, resulting in inability to Real-time and accurate measurement of the dynamic attitude data of the drilling tool during the drilling process.

At present, engineering parameter measurement technology is relatively mature in the petroleum field, but it is still blank in the field of drilling such as underground coal mines, and there are no relevant instruments or paper reports. Due to the particularity of underground coal mine drilling construction, hole size and "coal safety" requirements limit the possibility of using petroleum instruments in coal mines.

Contents of the invention

The purpose of this invention is to provide a coal mine underground multi-parameter measurement while drilling system and measurement method, which can measure the drilling pressure and torque data at different positions in the circumferential direction, truly reflect the stress state of each position of the drilling tool in the hole, and can effectively Avoid accidents such as drill stuck and dropped drill during construction.

In order to achieve the above objects, the technical solutions adopted by the present invention include:

A multi-parameter measurement-while-drilling system for coal mines, which is provided with a measuring tube. On the outer wall of the measuring tube, a main control board assembly, a vibration measurement assembly and a data collection assembly are sequentially embedded along the axial direction;

The vibration measurement component measures the vibration frequency and amplitude of the drilling tool and the flushing fluid pressure outside the measurement tube. At the same time, the vibration measurement component serves as a control switch for the data collection component and the main control board component;

The data collection component collects the measurement data of the vibration measurement component. At the same time, the data collection component collects the rotation speed of the drilling tool and the flushing fluid pressure in the measurement tube;

The main control board component integrates the inclinometer module to measure the dynamic attitude data and static attitude data of the drilling tool, and at the same time encodes and modulates the drilling tool attitude data and the data collected by the data collection component.

Optionally, the measuring tube is a tube body with a hollow channel; a support sleeve is axially embedded in one end of the measuring pipe, and a cable reducing joint is axially mounted in the supporting sleeve; the cable reducing joint passes through the support sleeve It is electrically connected to the main control board component, vibration measurement component and data collection component.

Optionally, the support sleeve is provided with an insulating seat, the insulating seat is surrounded by a cylinder, and a first contact male is provided in the insulating seat; a cable reducing joint is electrically connected to the first contact male.

Optionally, the cylinder is provided with multiple connectors radially, and each two connectors form a fan-shaped cavity; the insulating seat is located at the radial termination end of the connector; the connector is provided with a first wire hole. , the outer wall of the insulating seat is provided with a second wire hole, and the side wall of the first contact male connects the second wire hole and the first wire hole.

Optionally, the cable reducing joint is provided with a cable pipe body. One end of the cable pipe body is provided with a female contact, and the other end is provided with a second male contact; the waist of the cable pipe body is provided with a There is an annular boss, and the cable reducing joint is axially pushed and fixed through the fixing ring.

Optionally, the main control board assembly includes a main control board embedded in the outer wall of the measuring tube, with a first cover plate covering the main control board; an inclinometer module is written on the main control board, and the inclinometer module integrates 3 axis accelerometer and 3-axis magnetometer.

Optionally, the vibration measurement assembly includes a vibration sensor embedded in the measurement tube wall, covering the first gland provided with the vibration sensor; and a first pressure sensor embedded in the measurement tube wall, covering the first pressure sensor. The pressure sensor is provided with a second gland; the vibration sensor and the first pressure sensor are arranged along the circumference of the measuring tube, and the two are connected through the second bridge hole.

Optionally, the data collection component includes a data collection plate embedded in the outer wall of the measuring tube, with a second cover plate covering the data collection plate; a rotation speed plate and a second pressure plate are provided adjacent to the data collection plate. Sensor; the second pressure sensor is used to measure the flushing fluid pressure in the center channel of the measuring tube, the rotational speed board is used to measure the rotational speed of the drilling tool at this position, and the data acquisition board collects measurement data.

Optionally, a torque pressure measurement component is embedded circumferentially on the measurement tube. The torque pressure measurement component is evenly arranged at 90° in the circumferential direction. The torque pressure measurement component consists of 2 high-precision single-feather strain gauges and 1 high-precision strain gauge. Composed of precision shearing double-feather strain gauges; 2 high-precision single-feather strain gauges are arranged to ensure that their axes are parallel and perpendicular to the axis of the measuring tube respectively, used to measure the torque on the drilling tool at this position; high-precision shearing double-feather strain gauges The axis is parallel to the axis of the measuring tube and is used to measure the drilling pressure at that position.

A dynamic measurement method for a coal mine underground multi-parameter measurement while drilling system, including:

Step 1: During the drilling process, only the data collected by the accelerometer in the axial direction of the drilling tool and the magnetometer in the radial direction are continuously recorded within one working period, including one axial accelerometer data V _z and two radial magnetic forces. Count data B _x and By _y ;

Step 2: Process the acceleration data V _z measured by the axial accelerometer to obtain interference-free axial accelerometer measurement results v _z ; select the moving average filtering method to remove the radial acceleration component, and the calculation method is as follows:

Among them, 2n+1 represents the number of points of the moving average filter, which is determined according to the instrument rotation speed and recording frequency; k represents the number of points of the axial acceleration Vz collected by the axial accelerometer;

Step 3: Use the interference-free axial accelerometer measurement data v _z and the local gravity acceleration total field value G to calculate the dynamic well inclination angle θ;

Step 4: Calculate the vertical component B _v and the north component B _N of the geomagnetic field based on the total local geomagnetic field value B ₀ and the geomagnetic inclination angle β;
B _v =sinβ×B ₀ ;

According to the local geomagnetic total field value B ₀ and the radial magnetometer measurement data B _x , By _y , calculate the magnetic field component B _z along the drilling tool axis, and then calculate the horizontal magnetic field component along the drilling tool axis in the horizontal plane projection direction based on B _z _BH ;

Step 5: Calculate the dynamic azimuth angle γ based on the horizontal magnetic field component B _H and the north direction component B _N of the geomagnetic field in the projection direction of the drilling tool axis on the horizontal plane;

The beneficial effects of the present invention are:

① The multi-parameter measurement while drilling system of the present invention has multiple weight-on-bit and torque sensors evenly distributed in the circumference to form an annular circuit bridge, which can measure the weight-on-bit and torque data at different positions in the circumferential direction, truly reflecting the force at each position of the drilling tool in the hole. status, which can effectively avoid accidents such as drill stuck and dropped drill during construction; ② Multi-parameter data such as weight on bit, torque data, drill tool vibration data, rotational speed data, drill tool inner and outer annulus pressure data, circuit board temperature and other After collecting, filtering and encoding through the data acquisition board, it is decoded by the main control board. The decoded data, together with the drilling attitude data measured by the main control board integrated module, are packaged together, encoded and modulated again, and then transmitted to the computer through wired transmission. Computer, data signal transmission is stable and continuous, effectively solving the problems of inaccurate, serious lag, single data and other problems in coal mine orifice instrument measurement data; ③ This system involves circuit boards, sensors, wire holes, bridge wire holes and plug-ins. The mating parts are all sealed, and the parts are sealed and insulated with glue to ensure the sealing performance of the system and effectively solve the problem of core component failure caused by mud leakage; ④ This dynamic measurement method does not collect data along the drilling tool during the construction process. The radial gravity field component avoids the influence of centrifugal acceleration and radial vibration caused by the rotation of the drilling tool on the radial gravity field component, ensuring the accuracy of the dynamic attitude data of the drilling tool during the construction process; ⑤ Control data collection through vibration switches The working status of the board and the data acquisition mode of the control board can effectively reduce the overall power consumption of the system and achieve effective switching between dynamic attitude data and static attitude data of the drilling tool, which not only ensures the collection and transmission of multi-parameter data during the construction process, but also ensures that drilling is stopped. Accurate adjustment of tool facing angle after adding drill pipe.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. They are used to explain the present disclosure together with the following specific embodiments, but do not constitute a limitation of the present disclosure. In the attached picture:

Figure 1 is a cross-sectional view of the coal mine underground multi-parameter measurement while drilling system of the present invention;

Figure 2 is a top view of Figure 1;

Figure 3 is a cross-sectional view along line A-A in Figure 1;

Figure 4 is a cross-sectional view along B-B in Figure 1;

Figure 5 is a cross-sectional view along C-C in Figure 2;

Figure 6 is a schematic diagram of the arrangement of the sensors in the a direction in the torque pressure measurement assembly in Figure 5;

Figure 7 is a D-D cross-sectional view in Figure 2;

Figure 8 is a longitudinal sectional view of the support sleeve of the present invention;

Figure 9 is a cross-sectional view along E-E direction in Figure 8;

Figure 10 is an enlarged view of the structure of the cable reducing joint of the present invention;

Figure 11 is a flow chart of the dynamic measurement method of the coal mine underground multi-parameter measurement while drilling system of the present invention;

Description of numbers in the figure:
1-Measuring tube, 11-positioning bolt, 2-support sleeve, 21-cylinder body, 211-connector, 212-sector cavity, 213-annular slope, 214-sealing groove, 215-positioning hole, 216-first pass Wire hole, 22-insulation seat, 221-second wire hole, 23-first contact male head, 3-main control board component, 31-first cover plate, 32-main control board, 4-vibration measurement component , 41-vibration sensor, 42-first gland, 43-first pressure sensor, 44-second gland, 45-second bridge hole, 5-data collection component, 51-second cover plate, 52- Data acquisition board, 53-speed board, 54-second pressure sensor, 6-fixing ring, 7-cable reducing joint, 71-contact female head, 72-cable tube body, 73-second contact male Head, 8-torque pressure measurement component, 81-torque pressure sensor, 811-high-precision single-feather strain gauge, 812-high-precision shear double-feather strain gauge, 82-first bridge wire hole.

Detailed ways

The present invention will be described in detail below with reference to the drawings and specific embodiments.

The "circumferential", "axial", "radial", "direction", "front, back, left, right, up, down, top, bottom" and other directional words mentioned in the present invention are all facing the appendix of the description. The figures are quasi-illustrative, and the meanings expressed are the directional meanings generally recognized in the art.

With reference to Figures 1-10, the coal mine underground multi-parameter measurement while drilling system of the present invention is equipped with a measuring tube 1. The left end of the measuring tube 1 is connected to the non-magnetic drill pipe, screw motor and drill bit in sequence, and the other end is connected to the non-magnetic flux cable drill pipe in sequence. , cable drill pipe, cable water sender and hole computer. On the outer wall of the measuring tube 1, the main control board assembly 3 and the vibration measuring Measurement component 4 and data collection component 5; vibration measurement component 4 measures the vibration frequency and amplitude of the drilling tool and the flushing fluid pressure outside the measurement tube, and at the same time, the vibration measurement component 4 serves as the control switch for the data collection component 5 and the main control board component 3; The data collection component 5 collects the measurement data of the vibration measurement component 4. At the same time, the data collection component 5 collects the rotation speed of the drilling tool and the flushing fluid pressure in the measurement tube; the main control board component 3 integrates the inclinometer module to measure the dynamic attitude data of the drilling tool and Static attitude data, while encoding and modulating the drilling tool attitude data and data collected by the data collection component. The multi-parameter measurement while drilling system of the present invention has multiple weight-on-bit and torque sensors evenly distributed in the circumferential direction to form an annular circuit bridge, which can measure the weight-on-bit and torque data at different positions in the circumferential direction, truly reflecting the stress state of each position of the drilling tool in the hole. , which can effectively avoid accidents such as drill stuck and dropped drill during construction;

With reference to Figures 1, 8 and 9, in the embodiment of the present disclosure, the measuring tube 1 is a tube body with a hollow channel; a support sleeve 2 is axially embedded in one end of the measuring tube 1, and a passage is axially mounted in the support sleeve 2. The cable reducing joint 7 is electrically connected to the main control board assembly 3, the vibration measurement assembly 4 and the data collection assembly 5 through the support sleeve 2.

Specifically, the support sleeve 2 is plug-fitted to the right end of the measuring tube 1, and the cable reducing joint 7 is plug-fitted to the support sleeve 2 and fixed in the center channel of the right end of the measuring tube 1 through the fixing ring 6.

In the embodiment of the present disclosure, the support sleeve 2 is provided with an insulating seat, and the insulating seat is surrounded by a cylinder 21. There are three connectors 211 radially provided in the cylinder 21, and each of the three connectors forms a fan-shaped cavity 212. Its function is to serve as a flushing liquid inflow channel. Preferably, the insulating seat 22 is located at the axis formed by the three connectors, that is, the radial termination end of the three connectors 211; A first male contact 23 is arranged in the center of the ring. The first male contact 23 is insulated from other metal parts through an insulating seat 22. The side wall of the first male contact 23 is connected to the second wire hole 221; one of them is connected The body 211 is provided with a first wire passing hole 216, and the outer walls of the cylinder corresponding to the other two connecting bodies are respectively provided with a positioning hole 215. The outer wall of the insulating seat 22 is provided with a second wire passing hole 221. The insulating seat 22 Plugged into the cylinder 21 and fixed with glue, the first wire passing hole 216 and the second wire passing hole 221 have the same axis and are connected with each other.

As shown in Figure 10, the cable reducing joint 7 is provided with a cable pipe body 72. One end of the cable pipe body 72 is a male joint. The outside of the male joint is provided with a double-layer sealing ring structure. The other end of the cable pipe body 72 is a female connector. The male connector is provided with a female contact 71, and the female connector is provided with a second male contact 73. The cable tube body 72 is made of non-metallic material and has a through hole inside, and the through hole is provided with an insulated wire. To connect the female contact 71 and the second male contact 73, the cable pipe body 72 is provided with an annular boss at the waist, and the cable reducing joint 7 is axially pressed and fixed upward through the fixing ring 6.

With reference to Figure 2, the outer wall of the measuring tube 1 is provided with a first rectangular groove and a second rectangular groove, a first annular groove is provided between the axes of the first rectangular groove and the second rectangular groove, and between the first rectangular groove and the first annular groove There is a fourth wire passing hole, a fifth wire passing hole is provided between the second rectangular groove and the first annular groove, a third wire passing hole is provided at the right end of the first rectangular groove, and there are 2 wire passing holes on the right end of the measuring tube 1. 2 first positioning holes, the 2 first positioning holes and the third wire passing hole are evenly distributed at 120° in the circumferential direction. There is a bell mouth at the left end of the hole. The second rectangular groove is composed of a small rectangular groove at the left end and a large rectangular groove at the right end. There is a wire-passing hole between the small rectangular groove and the large rectangular groove at the right end. There is a pressure guide hole in the middle of the small rectangular groove. , the pressure guide hole is connected to the central channel of the measuring tube 1, and four second annular grooves are provided at the left end of the second rectangular groove. The first cover plate 31 is placed in the rectangular groove corresponding to the main control board 32 and fixed to the outer wall of the measuring tube 1 through hexagon socket bolts. The second cover plate 51 is placed in the rectangular groove corresponding to the data acquisition board 52 and passed through The hexagon socket bolts are fixed on the outer wall of the measuring tube 1.

In the embodiment of the present disclosure, the main control board assembly 3 includes a main control board 32 embedded in the outer wall of the measurement tube 1. The main control board 32 is covered with a first cover plate 31; inclinometer is written on the main control board 32. module, the inclinometer module integrates a 3-axis accelerometer and a 3-axis magnetometer. A rectangular groove is provided on the inside of the first cover plate 31. The first cover plate 31 is fixed to the outer wall of the measuring tube. The rectangular groove communicates with the first rectangular groove. The third wire hole is located below the rectangular groove, thereby communicating with the first rectangular groove. slot, the third wire hole, the first wire hole, the second wire hole until the first contact male head 23, the support sleeve 2 is plug-fitted into the measuring tube 1 so that the annular slope 213 matches the measuring tube 1 Bell mouth, the slope of the annular slope 213 is consistent with the slope of the bell mouth. The positioning bolt 11 is threadedly connected to the first positioning hole on the measuring tube 1. The threaded section still has one end exposed, and the exposed part is inserted into the positioning hole 215 on the cylinder body 21. The support sleeve 2 is fixed in position.

In the embodiment of the present disclosure, the data collection assembly 5 includes a data collection plate 52 embedded in the outer wall of the measurement tube 1. The data collection plate 52 is covered with a second cover plate 51; adjacent to the data collection plate 52 A rotational speed plate 53 and a second pressure sensor 54 are provided; the second pressure sensor 54 measures the flushing fluid pressure in the measuring tube 1, the rotational speed plate 53 measures the rotational speed of the drilling tool, and the data acquisition board 52 collects measurement data. A rectangular groove is provided on the inside of the second cover 51. The size of the rectangular groove is determined according to the size of the sensor arranged in the second rectangular groove. The second pressure sensor 54 is placed in the small rectangular groove on the left side of the second rectangular groove. The pressure hole is connected to the second pressure sensor 54, so that the flushing fluid pressure in the center channel of the drilling tool can be monitored during the construction process. The rotation speed plate 53 is placed at the left end of the large rectangular groove on the right side of the second rectangular groove, and the data acquisition board 52 is placed at the second rectangular groove. The right end of the large rectangular slot on the right side of the two rectangular slots is fixed with screws.

In the embodiment of the present disclosure, the vibration measurement assembly 4 includes a vibration sensor 41 embedded in the wall of the measurement tube 1, a first gland 42 provided to cover the vibration sensor 41; it also includes a vibration sensor 41 embedded in the wall of the measurement tube 1. The first pressure sensor 43 covers the second pressure cover 44 provided on the first pressure sensor 43; the vibration sensor 41 and the first pressure sensor 43 are arranged along the circumference of the measuring tube 1, and the two are connected through the second bridge hole 45 . The vibration sensor 41 is placed in the first annular groove and sealed by the first gland 42. The first pressure sensor 43 is placed in the third annular groove and sealed by the second gland 44. The middle part of the second gland 44 is provided with a pressure guide. The hole is used to communicate with the outer annulus of the drilling tool and the first pressure sensor 43. The vibration sensor 41 and the first pressure sensor 43 are connected in series through the insulated wires in the second bridge wire hole 45. The main control board 32 is placed in the first rectangular slot. and fixed with screws.

Among them, the second pressure sensor 54 is used to measure the flushing fluid pressure in the central channel of the measuring tube 1, and the rotation speed plate 53 It is used to measure the rotational speed of the drilling tool at this position. The data acquisition board 52 is mainly used to collect, filter and encode the data measured by each sensor. At the same time, the data acquisition board 52 integrates a temperature sensor inside, which is used to detect the data acquisition board 52 temperature. The vibration sensor 41 is used to measure the vibration frequency and amplitude of the drilling tool near the drill bit. At the same time, the vibration sensor 41 can be used as a control switch for the data acquisition board 52 and the main control board 32. The first pressure sensor 43 is used to measure the vibration frequency and amplitude of the drilling tool. To determine the flushing fluid pressure in the outer annulus between boreholes, the main control board 32 integrates an inclinometer module. The inclinometer module integrates a 3-axis accelerometer (X, Y, Z axes) and a 3-axis magnetometer (X, Y , Z axis), can measure the dynamic attitude data of the drilling tool in the hole during the drilling process and the static attitude data of the drilling tool after the construction of a single drill pipe is completed. The main control board 32 simultaneously monitors the drilling tool attitude data and the data acquisition board 52 The packed data is encoded and modulated again.

The torque pressure measurement component 8 adopts 4 groups evenly arranged at 90° in the circumferential direction, and are respectively arranged in 4 second annular grooves. Among them, the torque pressure measurement component 8 uses 2 pieces of high-precision single feather strain gauges 811 and 1 piece of high-precision shearing. Double-feather strain gauge 812, three strain gauges are connected to the terminals in the second annular groove, and two high-precision single-feather strain gauges 811 are arranged to ensure that their axes are parallel and perpendicular to the axis of measuring tube 1 respectively, for measuring the The axis of the high-precision double-feather strain gauge is parallel to the axis of the pipe body and is used to measure the torque on the drilling tool at this position. A total of 8 torque parameters and 8 weight-on-bit parameters are obtained from the 4 sets of sensors. Four or four groups of torque pressure measuring assemblies 8 are connected in series through insulated wires in the first bridge wire hole 82 to form an annular circuit bridge, which can measure the drilling pressure and torque at different circumferential positions in the bending state of the drilling tool. The four second annular grooves are evenly arranged at 90° in the circumferential direction. The four second annular grooves are connected to each other through the first bridge wire hole 82. The small rectangular groove at the right end of the second annular groove is connected to its left side through the sixth wire crossing hole. The first bridge wire holes 82 are connected, and the first annular groove and the third annular groove are arranged at an angle of 90° in the circumferential direction and are connected through the second bridge wire hole 45 .

The four torque pressure measurement components 8, the second pressure sensor 54, the rotation speed plate 53, the vibration sensor 41, the first pressure sensor 43 and the data acquisition board 52 are connected in series. The data acquisition board 52 is connected with the main control board 32 and the first contact pin. The heads 203 are connected in series with each other, and then connected to the non-magnetic flux cable drill pipe, the cable drill pipe, the cable water feeder and the computer in sequence through the cable reducing joint 7 at the right end, forming a complete set of multi-parameter measurement while drilling system. .

Among them, all the wires passing through the wire holes and bridge wire holes in the entire system are insulated wires, and after the insulated wires are laid out, glue is injected again for secondary insulation sealing. The first cover plate 31, the second cover plate 51 and There is a back-shaped rubber gasket between the measuring tubes 1 to prevent the flushing liquid from entering the first rectangular groove and the second rectangular groove during the construction process and corroding the core electronic components such as the internal data acquisition board 52 and the main control board 32, and the second pressure sensor 54 The flushing fluid pressure in the central channel of the measuring tube 1 is mainly measured through the pressure guide hole. Therefore, a high-pressure sealing ring is provided between the second pressure sensor 54 and the pressure guide hole. The first pressure cover 42 and the second pressure seal involved in the embodiment The cover 44 is threadedly connected to the pipe body, and its non-threaded connection part is provided with an O-ring for sealing. The upper and lower ends of the outer wall of the cylinder 21 are provided with two sealing grooves 214, and multiple O-rings are used for radial sealing. Sealed to effectively prevent the flushing fluid pressure at the inlet from being too high and causing the flushing fluid to flow along the third line hole Enter the first rectangular slot.

In addition, the overall material of the measuring tube 1, the first cover plate 31, the second cover plate 51, the first gland 42, the second gland 44 and the corresponding accessories are all made of non-magnetic steel to avoid geomagnetic interference and thus affect the inclinometer module. Accuracy of drilling tool attitude data measurement.

The industrial control method of the coal mine underground multi-parameter measurement while drilling system of the present invention includes the following steps:

Step 1: During the construction process, the drilling tool vibrates. The vibration sensor 41 detects the vibration of the drilling tool and controls the start of the data acquisition board 52 to start collecting all data. The drilling rig drives the drilling tool in the hole to rotate and applies a certain bit pressure to the drilling tool. The torque and bit weight are transmitted to the multi-parameter measurement while drilling system near the drill bit. The strain gauge in the torque pressure measurement component 8 is affected by the bit weight and torque. function to convert real-time weight on bit and torque into electrical signals and transmit them to the data acquisition board 52. The electrical signals include a total of 4 sets of data, each set of data has 2 weight on bit values and 1 torque value; the vibration and The vibration caused by the friction between the drilling tool and the hole wall is collected in real time by the vibration sensor 41 and transmitted to the data acquisition board 52 in the form of an electrical signal. The vibration sensor 41 can measure the vibration of the X, Y, and Z axes in the axial and radial directions; The second pressure sensor 54 and the first pressure sensor 43 convert the flushing fluid pressure in the center channel of the system and the drilling annulus into electrical signals and transmit them to the data acquisition board 52; the rotational speed board 53 measures the rotational speed of the system near the drill bit in real time. And transmitted to the data acquisition board 52 in the form of electrical signals; the temperature sensor integrated on the data acquisition board 52 measures the temperature of the circuit board in real time, and the data acquisition board 52 collects, filters, and encodes the above electrical signals and then packages them and sends them to the main control board 32 , the main control board 32 decodes the packaged signal, and at the same time, after the main control board 32 receives the drilling tool vibration data signal, the inclinometer module in the main control board 32 collects the drilling tool dynamic attitude data, and the three-axis acceleration in the dynamic measurement mode The magnetometer has only one axial accelerometer to collect V _z , and the three-axis magnetometer has only two radial magnetometers to collect B _x and By _y . The main control board 32 encodes and modulates the above data again through low-voltage DC carrier technology, and then The upper magnetic flux cable drill pipe, cable drill pipe and cable water feeder are transmitted to the hole computer. The computer finally demodulates the signal data to obtain all dynamic data parameters during the drilling process. Among them, the calculated dynamic data The drilling tool attitude data parameters are azimuth and inclination.

Step 2: Stop drilling and add the drill pipe. The vibration of the drilling tool stops. The vibration sensor 41 detects that the vibration of the drilling tool stops and controls the data acquisition board 52 to stop collecting data, thereby reducing power consumption. At the same time, after the main control board 32 cannot receive the vibration data signal of the drilling tool, the inclinometer module integrated in the main control board 32 only collects the static attitude data of the drilling tool. In the static measurement mode, the three-axis accelerometer collects the three-dimensional acceleration V _x , V _y , V _z , the three-axis magnetometer collects the three-directional magnetic field intensity B _x , By _y , B _z , the main control board 32 encodes and modulates the static attitude data of the drilling tool through low-voltage DC carrier technology, and then passes it through the upper non-magnetic The cable drill pipe, cable drill pipe, and cable water sender are transmitted to the hole computer, and the computer finally demodulates the signal data to calculate the static attitude data parameters of the drilling tool (azimuth, inclination, and tool roll angle).

Combined with Figure 11, the dynamic measurement method of the coal mine underground multi-parameter measurement while drilling system of the present invention includes:

Step 1: During the drilling process, only the accelerometer in the axial direction (Z-axis) and the magnetometer in the radial direction (X-axis, Y-axis) of the drilling tool are continuously recorded for a period of time (the vibration sensor detects the start to stop of vibration). ) collected data, the measurement data includes one axial accelerometer data V _z and two radial magnetometer data B _x , By _y ;

Among them, 2n+1 represents the number of points of the sliding average filter. The number of points of the sliding average filter is determined according to the instrument speed and recording frequency. Taking the common rotation speed of 60r/min in coal mines as an example, the rotation frequency is 1Hz and the acquisition frequency is 200Hz, then the sliding average filtering The number of points 2n+1 should be greater than 200;

Step 4: Calculate the vertical component B _V and the north component B _N of the geomagnetic field based on the local total geomagnetic field value B ₀ and the geomagnetic inclination angle β (the north component B _N is generally obtained based on data query or actual geographical location);
B _v =sinβ×B ₀ ;

The above preferred embodiments are discussed in detail in conjunction with the accompanying drawings and are not intended to limit the present invention. described in the above Each specific technical feature can be combined in any suitable form if there is no contradiction, and the present invention will not repeat them one by one. Any person skilled in the art may adopt simple modifications or modifications such as any combination or equivalent replacement of the technical solutions without departing from the scope of the technical solutions. This does not affect the essence of the technical solutions and still represents the embodiments of the present invention. within the scope of protection of the technical solution.

Claims

A multi-parameter measurement-while-drilling system for coal mines, which is characterized in that a measuring tube (1) is provided, and on the outer wall of the measuring tube (1), a main control board assembly (3) and a vibration measurement unit are sequentially embedded along the axial direction. component (4) and data collection component (5);

The vibration measurement component (4) measures the vibration frequency and amplitude of the drilling tool and the flushing fluid pressure outside the measurement tube. At the same time, the vibration measurement component (4) serves as a control switch for the data collection component (5) and the main control board component (3);

The data collection component (5) collects the measurement data of the vibration measurement component (4). At the same time, the data collection component (5) collects the rotation speed of the drilling tool and the flushing fluid pressure in the measurement tube;

The main control board component (3) integrates the inclinometer module to measure the dynamic attitude data and static attitude data of the drilling tool, and at the same time encodes and modulates the drilling tool attitude data and the data collected by the data collection component.
The coal mine underground multi-parameter measurement while drilling system according to claim 1, characterized in that the measuring tube (1) is a tube body with a hollow channel;

A support sleeve (2) is axially embedded in one end of the measuring tube (1), and a cable reducing joint (7) is axially mounted in the support sleeve (2);

The cable reducing joint (7) is electrically connected to the main control board assembly (3), vibration measurement assembly (4) and data collection assembly (5) through the support sleeve (2).
The coal mine underground multi-parameter measurement while drilling system according to claim 2, characterized in that the support sleeve (2) is provided with an insulating seat (22), and the insulating seat (22) is surrounded by the cylinder (21). A first contact male head (23) is provided inside (22);

A cable reducing joint (7) is electrically connected to the first contact male (23).
The coal mine underground multi-parameter measurement while drilling system according to claim 3, characterized in that a plurality of connectors (211) are radially provided in the cylinder (21), and each two connectors (211) form a a sector cavity (212);

The insulating seat (22) is located at the radial termination end of the connecting body (211); the connecting body (211) is provided with a first wire passing hole (216), and the outer wall of the insulating seat (22) is provided with a second wire passing hole (221) ), the side wall of the first contact male (23) communicates with the second wire hole (221) and the first wire hole (216).
The coal mine underground multi-parameter measurement while drilling system according to claim 2, 3 or 4, characterized in that the cable reducing joint (7) is provided with a cable pipe body (72), and the cable pipe body (72) 72) One end is provided with a female contact (71), and the other end is provided with a second male contact (73);

The waist of the cable pipe body (72) is provided with an annular boss, and the cable reducing joint (7) is axially pressed and fixed through the fixing ring (6).
The coal mine underground multi-parameter measurement while drilling system according to claim 1, 2, 3 or 4, characterized in that the main control board assembly (3) includes a main control board embedded in the outer wall of the measuring tube (1). The main control board (32) is covered with a first cover plate (31);

An inclinometer module is written on the main control board (32), and the inclinometer module integrates a 3-axis accelerometer and a 3-axis magnetometer.
The coal mine underground multi-parameter measurement while drilling system according to claim 1, 2, 3 or 4, characterized in that the vibration measurement component (4) includes a vibration sensor embedded in the wall of the measurement tube (1) (41), covering the first gland (42) provided with the vibration sensor (41);

It also includes a first pressure sensor (43) embedded in the wall of the measuring tube (1), and a second pressure cover (44) provided to cover the first pressure sensor (43);

The vibration sensor (41) and the first pressure sensor (43) are arranged along the circumferential direction of the measuring tube (1), and the two are connected through the second bridge hole (45).
The coal mine underground multi-parameter measurement while drilling system according to claim 1, 2, 3 or 4, characterized in that the data collection component (5) includes a data collection plate embedded in the outer wall of the measurement tube (1) (52), the data acquisition plate (52) is covered with a second cover plate (51); a rotation speed plate (53) and a second pressure sensor (54) are arranged adjacent to the data acquisition plate (52);

The second pressure sensor (54) measures the flushing fluid pressure in the measuring tube 1, the rotational speed plate (53) measures the rotational speed of the drilling tool, and the data acquisition plate (52) collects the measurement data.
The coal mine underground multi-parameter measurement while drilling system according to claim 1, characterized in that a torque pressure measurement assembly (8) is embedded circumferentially on the measurement tube (1), and the torque pressure measurement assembly (8) Evenly distributed at 90° along the circumferential direction, the torque pressure measurement component (8) consists of 2 high-precision single-feather strain gauges (811) and 1 high-precision shear double-feather strain gauge (812);

Two pieces of high-precision single-feather strain gauges (811) are arranged to ensure that their axes are parallel and perpendicular to the axis of the measuring tube (1) respectively, and are used to measure the torque on the drilling tool at this position;

The axis of the high-precision shear double-feather strain gauge (812) is parallel to the axis of the measuring tube (1), and is used to measure the drilling pressure on the drilling tool at this position.
A dynamic measurement method for a coal mine underground multi-parameter measurement while drilling system, which is characterized by including:

Step 1: During the drilling process, only the data collected by the accelerometer in the axial direction of the drilling tool and the magnetometer in the radial direction are continuously recorded within one working period, including one axial accelerometer data V z and two radial magnetic forces. Count data B x and By y ;

Step 2: Process the acceleration data V z measured by the axial accelerometer to obtain interference-free axial accelerometer measurements Result v z ; the moving average filter method is selected as the method to remove the radial acceleration component, and the calculation method is as follows:

Among them, 2n+1 represents the number of points of the moving average filter, and the number of points of the moving average filter is determined according to the instrument speed and recording frequency;

Step 3: Use the interference-free axial accelerometer measurement data v z and the local gravity acceleration total field value G to calculate the dynamic well inclination angle θ;

Step 4: Calculate the vertical component B v and the north component B N of the geomagnetic field based on the total local geomagnetic field value B 0 and the geomagnetic inclination angle β;
B v =sinβ×B 0 ;

According to the local geomagnetic total field value B 0 and the radial magnetometer measurement data B x , By y , calculate the magnetic field component B z along the drilling tool axis, and then calculate the horizontal magnetic field component along the drilling tool axis in the horizontal plane projection direction based on B z BH ;

Step 5: Calculate the dynamic azimuth angle γ based on the horizontal magnetic field component B H and the north direction component B N of the geomagnetic field in the projection direction of the drilling tool axis on the horizontal plane;