WO2021031560A1

WO2021031560A1 - System and method for near-bit multi-parameter measurement based on optical fiber grating

Info

Publication number: WO2021031560A1
Application number: PCT/CN2020/080819
Authority: WO
Inventors: 谭健; 郭伟耀; 谭云亮; 赵同彬; 姚金鹏
Original assignee: 中国石油大学(华东); 山东科技大学
Priority date: 2019-12-20
Filing date: 2020-03-24
Publication date: 2021-02-25
Also published as: CN111119859B; CN111119859A; RU2756615C1

Abstract

A system and a method for near-bit multi-parameter measurement based on optical fiber grating, relating to the technical field of measurement while drilling in coal mines. The system comprises a drilling apparatus (1), a measurement apparatus (2) and a data transmission apparatus (3). The drilling apparatus (1) comprises a drill bit (11), a drill pipe (12) and a drill gyroscope (13). The measurement apparatus (2) comprises a force measurement segment (21) and a photoelectric rotary joint (22). The data transmission apparatus comprises an optical fiber (31) and a signal processor (32). The force measurement segment (21) is divided into a force measurement segment front portion (211) and a force measurement segment rear portion (212). A recess (213) arranged in the force measurement segment front portion (211) cooperates with a ribbed bar (214) arranged on the force measurement segment rear portion (212). An optical fiber grating sensor is arranged on both the recess (213) and the ribbed bar (214). An optical fiber (31) extends along the interior of the drill pipe (12) to the photoelectric rotary joint (22), and transmits spectral information to the signal processor (32). The measurement system is used in a process of borehole pressure relief. The drill bit (11) drills under the action of the drilling apparatus (1), the measurement apparatus (2) measures the torque, rotational speed, drilling pressure, and hole depth at the position of the drill bit (11), and the data is transmitted to the signal processor (32). As the drill pipe (12) drills further, drill pipes (12) are sequentially connected. The problem of relatively large errors in multi-parameter measurement in long boreholes is thus solved.

Description

A near-bit multi-parameter measurement system and method based on fiber grating

[0001] The present invention relates to the technical field of measurement while drilling underground in coal mines, and in particular to a near-bit multi-parameter measurement system based on fiber grating and a method for measuring using the measurement system. Background technique

[0002] In the deep mining of coal mines, the prevention and control of rock burst is the focus of ensuring safe mining, and borehole pressure relief is an important technical means in the prevention of rock burst, and is widely used. A good decompression effect depends on the decompression parameters that match the stress of the coal and rock mass, and most of the existing coal and rock mass stress measurement methods are obtained by field stress testing. Taking into account the hysteresis of the secondary re-hole stress measurement, measurement while drilling can obtain the drilling parameters and calculate the coal and rock mass stress at the same time as the pressure relief hole is constructed, so as to adjust the pressure relief parameters to achieve the best pressure relief effect.

[0003] Among the fields of gas drainage, geological prospecting, coal mining, etc., the existing measurement while drilling technology is as follows, the existing patent documents, [Patent Document 1]: Chinese Patent 201358711Y; [Patent Document 2]: Chinese Patent 107 503734A .

[0004] Patent Document 1 discloses a drilling rig with a measurement while drilling function, which consists of a power machine, a transmission shaft, a reduction box, a chassis, a hydraulic control box, a hexagonal drill rod, a head shell, a beam, a vertical shaft, a piston rod, and a hydraulic The cylinder consists of a torque measuring device coaxially installed on the lower part of the vertical shaft, a speed measuring device and a displacement measuring device are installed on the beam, and an oil pressure measuring device is installed in the hydraulic control box. The torque, oil pressure, speed and displacement measuring devices are all Corresponding sensors and circuit boards are composed, and bluetooth modules are installed on the circuit boards. The measuring structure of the device is set at the drilling rig. Because the drill pipe is squeezed by the surrounding rock during the drilling process, the measured torque of the measuring structure is the sum of the torque applied to the drill bit and the torque applied to the drill pipe. The depth of entry increases.

[0005] Patent Literature 2 discloses a measurement-while-drilling probe pipe device for mining, which includes an end cover component, a support component, a shock-absorbing body component, a base component, an outer tube, and a top column component. The front end of the support component is connected to the end cover component; The shock absorber assembly is installed in the threaded hole of the central axis of the support assembly; one end of the outer pipe is installed at the back end of the support assembly; the top column assembly is installed at the other end of the outer pipe; the base assembly is installed at the core of the rear end of the shock absorber assembly On the head. The device has a complex structure, many signal transmission interference factors, and high use and maintenance costs. Summary of the inventionTechnical problemsProblem solutionsTechnical solutions

[0006] Technical problems to be solved by the present invention:

[0007] In the process of drilling, especially in the process of pressure relief in deep mines, it is necessary to measure the drilling parameters at the position of the drill bit in real time, so as to determine the coal and rock stress conditions at that location and determine whether the pressure relief of the borehole has reached the pressure relief Effect; But the existing measurement while drilling rigs such as Patent Document 1 measure torque and drilling pressure at the rig position outside the borehole, but the torque to be measured should be the torque at the position of the drill bit, and the measured drilling pressure is also Affected by resistance such as the friction of the drill pipe, the measurement error also increases with the increase of the hole depth; for example, in Patent Document 2, the use of a probe tube for measurement is not convenient for long-distance drilling to discharge the drill shoulder, and its signal transmission is also easy Receive interference.

[0008] In order to accurately measure the torque, rotation speed, drilling pressure and hole depth parameters near the drill bit, and determine the effect of drilling pressure relief based on the measured parameters in real time, it is necessary to avoid errors caused by the long drill bit-to-drill rod distance during long-distance drilling At the same time, it is also necessary to facilitate drilling and discharge the drill shoulder to prevent signal interference. The present invention provides a near-drill multi-parameter measurement system and method based on fiber grating. The specific technical solutions are as follows.

[0009] A fiber grating-based near-drill multi-parameter measurement system, including a drilling device, a measurement device, and a data transmission device. The drilling device includes a drill bit, a drill pipe, and a drill gyrator. The drilling device drills through the drill bit The measuring device includes a force joint and a photoelectric rotary joint. The force joint of the measuring device is connected to the drill bit and measures the torque, rotation speed, drilling pressure and hole depth parameters of the drill bit; the data transmission device includes an optical fiber and a signal processor , The optical fiber of the data transmission device transmits the measurement parameters to the signal processor, and the signal processor receives and stores the measurement parameters; the rear end of the drill bit and the force measuring section are connected by threads, and the rear end of the force measuring section is connected with the drill pipe through the threads, and the drill pipe penetrates Through the drilling rig gyrator, the back end of the drill pipe is connected with a photoelectric rotary joint, and the drilling rig gyrator and the photoelectric rotary joint are connected by a slide rail; the force measuring section includes the front part of the force measuring section and the rear part of the force measuring section. Groove, ribs are arranged at the rear of the force joint, and the grooves and ribs are installed in cooperation; the front end surface of the rib at the rear of the force joint and the contact surface at the front of the force joint is provided with a propulsion measuring fiber grating The sensor is equipped with a torque measuring fiber grating sensor along the length of the rib; the drill pipe is connected with the rotor of the photoelectric rotary joint, and the stator of the photoelectric rotary joint is connected with the signal processor. [0010] Preferably, the front end of the force joint is connected with the drill bit through a thread and a slot, and the rear end of the force joint is connected with the drill rod through a thread and the slot, and the length of the force joint is equal to the length of the drill bit.

[0011] Preferably, the ribs at the rear of the force measuring section and the grooves at the front of the force measuring section are both provided with mounting grooves for placing the torque measuring fiber grating sensor; the propulsion measuring fiber grating sensor is round It is ring-shaped and placed in the mounting groove on the front end of the rib at the rear of the force measurement joint.

[0012] It is further preferred that the front part of the force measurement joint and the rear part of the force measurement joint define the relative positions of the two parts in the axial direction of the drill rod through a necking and a necking.

[0013] It is further preferred that the drill bit, the force measurement joint, and the drill pipe are provided with water injection holes along the longitudinal axis, and the drill bit, the force measurement joint and the drill pipe water injection holes are communicated.

[0014] A method for measuring near-bit multi-parameters based on fiber grating, using the above-mentioned near-bit multi-parameter measurement system based on fiber grating, the steps include:

[0015] Step 1. Determine the location of the drill hole, assemble the drilling device, measuring device and data transmission device;

[0016] Step 2. Start drilling, while advancing with the drill bit, the back of the force measurement section squeezes the propulsion force measurement fiber grating sensor, the optical fiber transmits the spectral signal to the signal processor; the ribs and grooves are engaged, and the squeezing torque Measure the fiber grating sensor, the optical fiber transmits the spectrum signal to the signal processor;

[0017] Step 3. The photoelectric rotary joint advances with the drill pipe, approaching the drill gyrator along the slide rail, the hole depth is determined by the length of the drill pipe connected to the optical fiber, and the rotation speed of the drill bit is determined by the photoelectric rotary joint;

[0018] Step 4. Split the first drill rod and the photoelectric rotary joint, connect to the second drill rod, the photoelectric rotary joint is connected to the back end of the second drill rod, and continue drilling; the signal processor records the torque and speed of the drill bit , Drilling pressure and hole depth parameters;

[0019] Repeat step four above until the full-length drilling is completed.

[0020] It is further preferred that the drilling is a pressure relief drilling, and the pressure relief effect is determined according to the drilling torque, rotation speed, drilling pressure and hole depth parameters. The beneficial effects of the invention

[0021] The beneficial effects of the present invention are:

[0022] (1) Provide a simple, low-cost, efficient, and accurate fiber grating-based near-drill multi-parameter measurement system, which uses a fiber grating sensor for real-time and accurate measurement. The force measurement section is arranged at the rear, thereby avoiding measurement errors of long boreholes, simplifying the drilling parameter measuring device, reducing the manufacturing cost of the drilling parameter measuring device, and improving the efficiency of measurement while drilling.

[0023] (2) During drilling, real-time measurement of the torque, rotation speed, drilling pressure and hole depth of the drill bit at the position of the drill bit, and other parameters, so as to determine the effect of drilling pressure relief at the depth of the drill bit; by setting the fiber grating sensor , The measurement system can be applied to high gas mines; the measuring sensor is set inside the force measurement joint, so the bit torque and drilling pressure measurement is more accurate, and is not affected by the borehole wall and borehole depth. [0024] The measurement method also has the advantages of simple operation, wide application range, and accurate measurement. Brief description of the drawings

[0025] FIG. 1 is a schematic structural diagram of a near-bit multi-parameter measurement system based on fiber grating in Embodiment 1;

[0026] FIG. 2 is a schematic diagram of the structure of the force measuring section;

[0027] FIG. 3 is a schematic diagram of the split structure of the force measuring section;

[0028] FIG. 4 is a schematic diagram of the sensor installation structure on the force measuring section;

[0029] FIG. 5 is a schematic diagram of the drill bit structure;

[0030] FIG. 6 is a schematic diagram of the structure of the drill gyrator and the photoelectric rotary joint;

[0031] FIG. 7 is a schematic diagram of the structure of a photoelectric rotary joint;

[0032] FIG. 8 is a schematic diagram of the structure of the near-bit multi-parameter measurement system in Embodiment 2;

[0033] FIG. 9 is a schematic diagram of a data processing curve in Embodiment 3.

[0034] In the figure: 1-Drilling device; 11-Drill bit; 12-Drill pipe; 13-Drilling rig gyroscope; 14-Slide rail; 2-Measurement device; 21-force joint; 211 -front of force joint ; 212-the rear of the force measuring section; 213-grooves; 214-ribs; 21 5-fiber grating sensor for propulsion measurement; 216-fiber grating sensor for torque measurement; 22-photoelectric rotary joint; 23-power supply; 3-data Transmission device; 31-optical fiber; 32 signal processor; 33-data line. Inventive embodiment of the present invention

[0035] With reference to FIG. 1 to FIG. 9, the present invention provides a fiber grating-based near-bit multi-parameter measurement system and method for specific implementations as follows.

[0036] The measuring device for the parameters of the drill bit is generally set at the position of the drill rig, and parameters such as the rotation speed, torque, and drilling pressure of the drill rod are measured at the position of the drill rig. However, with the lengthening of the drill rod, the bit position in the actual drilling process There is a big difference in the parameters of the drill rod between the position of the drill and the position of the drill. In order to accurately determine the drilling parameters near the drill bit during long drilling, a parameter measurement system and measurement method near the drill bit position are provided.

[0037] Embodiment 1

[0038] This embodiment provides a near-bit multi-parameter measurement system based on fiber Bragg grating. The specific structure includes a drilling device 1, a measuring device 2 and a data transmission device 3. The drilling device 1 ensures that the drill bit and the drill rod are normally drilled. The measuring device 2 can measure multiple parameters such as torque, rotation speed, drilling pressure and hole depth of the drill bit, and the data transmission device 3 ensures real-time transmission and processing of data during the working process of the drill. The system uses a fiber grating sensor for real-time and accurate measurement. The force measurement section is set behind the drill bit close to the position of the drill bit, thereby avoiding measurement errors in long boreholes, simplifying the drilling parameter measurement device, and reducing the measurement of drilling parameters The manufacturing cost of the device improves the efficiency of measurement while drilling.

[0039] The drilling device 1 includes a drill bit 11, a drill rod 12, and a drill gyrator 13. The drilling device 1 drills through the drill bit 11, the rear end of the drill rod 12 is connected to the drill gyrator, and the front end is connected to the drill bit through a force joint . The measuring device 2 includes a force joint 21 and a photoelectric rotary joint 22. The force joint 21 of the measuring device 2 is connected to the drill bit 11 and measures the torque, rotation speed, drilling pressure and hole depth parameters of the drill bit. The photoelectric rotary joint 22 facilitates the working process of the drill Transmission of data. The data transmission device 3 includes an optical fiber 31 and a signal processor 32. The optical fiber of the data transmission device 3 transmits the measurement parameters to the signal processor, and the signal processor 32 receives and processes spectral information and stores the measurement parameters.

[0040] The specific connection structure of the system is shown in FIG. 1 to FIG. 7. With the drilling direction of the drill bit 11 as the front end of the drill bit, the rear end of the drill bit 11 and the force measuring section 21 are connected by threads, and the back end of the force measuring section 21 passes through The thread is connected with the drill pipe. The drill pipe 12 passes through the drill gyrator, and the drill gyrator 13 advances the drill pipe for drilling. The rear end of the drill pipe 12 is connected with a photoelectric rotary joint 22. The drill gyrator 13 and the photoelectric rotary joint 22 are connected by a slide rail. , The photoelectric rotary joint 22 moves along the slide rail. The force measuring section 21 includes a force measuring section front 211 and a force measuring section rear 212. The force measuring section front 211 is provided with a groove 213, and the force measuring section rear 212 is provided with ribs. The grooves 213 and the ribs 214 are mutually connected. Cooperate with installation. A propulsion measuring fiber grating sensor is provided between the front end surface of the rib 214 at the rear of the force joint and the contact surface at the front of the force joint to measure the drilling pressure at the position of the drill bit, and a torque is provided along the length direction of the rib 214 The measuring fiber grating sensor 216 is used to measure the torque of the collimator. The drill pipe 12 is connected to the rotor of the photoelectric rotary joint 22, and the stator of the photoelectric rotary joint is connected to the signal processor. The photoelectric rotary joint 22 can measure the rotation speed of the drill and determine the hole depth according to the footage of the drill pipe. [0041] The specific structure of the force measuring section 21 is that the front end of the force measuring section is connected with the drill bit through a screw thread and a clamping groove. The screw thread connects the two, and the clamping groove prevents the drilling rig from rotating or the axial movement of the drill rod causing the two to be disconnected. The rear end of the force joint 21 is connected to the drill rod through a thread and a slot, and the length of the force joint is equal to the length of the drill bit, thereby further ensuring the accuracy of the measurement. The ribs at the rear 212 of the force measurement section and the grooves at the front section 211 of the force measurement section are both provided with mounting grooves for mounting the torque measurement fiber grating sensor 216, wherein the mounting grooves are specifically to compress the grooves when the ribs rotate The surface is the radial surface of the rib in the direction of rotation of the drill bit. The propulsion force measurement fiber grating 215 sensor is in the shape of a circular ring and is placed in the mounting groove on the front end surface of the rib 212 at the rear of the force measurement joint. In addition, the installation groove is provided with a water discharge seal, and a sealing strip is provided along the installation groove. The front part 211 of the force measuring joint and the rear part 212 of the force measuring joint define the relative position of the two parts in the axial direction of the drill rod through the necking and necking. , Prevent the two parts of the force measuring joint from being pulled apart when the drill is withdrawn.

[0042] The drill bit 11, the force measuring section 21, and the drill pipe 12 are provided with water injection holes along the longitudinal axis for cooling the drill bit and the drill pipe during drilling. The drill bit 11, the force measuring section 21 and the drill pipe 12 are connected to the water injection hole through. In addition, the optical fiber 31 is also arranged along the force joint and the drill pipe, and an optical fiber channel can be provided inside it. The optical fiber 31 between the drill pipes 12 is connected by a quick connector. The optical fiber 31 rotates with the drill pipe 12 during the drilling process. The optical fiber of the drill rod at the rear end of the rod is transmitted through a photoelectric rotary joint, and the photoelectric rotary joint 22 is connected to the signal processor 32.

[0043] A method for measuring near-bit multi-parameters based on fiber grating, using the above-mentioned near-bit multi-parameter measurement system based on fiber gratings, the steps include:

[0044] Step 1. Determine the location of the drilling hole, specifically by positioning the drilling location by measuring and setting out, and at the same time assembling the drilling device, the measuring device and the data transmission device.

[0045] Step 2. Start drilling, while advancing with the drill bit, the back of the force measurement section squeezes the propulsion force measurement fiber grating sensor, the optical fiber transmits the spectrum signal to the signal processor; the ribs and grooves are engaged, and the squeezing torque For measuring fiber grating sensors, the optical fiber transmits the spectrum signal to the signal processor.

[0046] Step 3. The photoelectric rotary joint advances with the drill pipe, approaching the drill gyrator along the slide rail, the hole depth is determined by the length of the drill pipe connected to the optical fiber, and the rotation speed of the drill bit is determined by the photoelectric rotary joint.

[0047] Step 4. Split the first drill rod and the photoelectric rotary joint, connect to the second drill rod, the photoelectric rotary joint is connected to the back end of the second drill rod, and continue drilling; the signal processor records the torque and speed of the drill bit , Drilling pressure and hole depth parameters.

[0048] Repeat step four above until the full-length drilling is completed. [0049] The above-mentioned drilling is a pressure relief drilling, and the pressure relief effect is determined according to the drilling torque, rotation speed, drilling pressure and hole depth parameters.

[0050] Embodiment 2

[0051] This embodiment provides a near-drill multi-parameter measurement system based on strain gauges. As shown in FIG. 8, the strain gauge is specifically used to replace the fiber grating. Although the effect is not as good as the fiber grating, it is in the design concept and overall of the present invention. The objective of the present invention can also be achieved on the basis of the structure.

[0052] A strain gauge-based multi-parameter measurement system near the drill bit, including a drilling device, a measurement device, and a data transmission device. The drilling device includes a drill bit, a drill pipe, and a drill gyrator, and the drilling device drills through the drill bit . The measuring device includes a force joint and a photoelectric rotary joint. The force joint of the measuring device is connected with the drill bit and measures the torque, rotation speed, drilling pressure and hole depth parameters of the drill bit; the data transmission device includes a data line and a signal processor, and a data transmission device The data cable transmits the measurement parameters to the signal processor, which receives the electrical signal processing of the strain gauge and stores the measurement parameters. The rear end of the drill bit and the force measuring section are connected by threads, and the rear end of the force measuring section is connected with the drill pipe through threads. The drill pipe passes through the drill rig gyrator, and the rear end of the drill pipe is connected with a photoelectric rotary joint. The force measurement joint includes the front part of the force measurement joint and the rear part of the force measurement joint. The front part of the force measurement joint is provided with grooves, and the rear part of the force measurement joint is provided with ribs. The grooves and ribs are installed in cooperation with each other; A propulsion force measuring strain gauge sensor is arranged between the front end surface of the rib at the rear part of the joint and the contact surface at the front part of the force measuring joint, and a torque measuring strain gauge sensor is arranged along the length direction of the rib. The drill pipe is connected to the rotor of the photoelectric rotary joint, and the stator of the photoelectric rotary joint is connected to the signal processor, which transmits the spectrum signal to the signal processor.

[0053] The front end of the force joint is connected with the drill bit through a thread and a clamping groove, and the rear end of the force joint is connected with the drill rod through a thread and the clamping groove, and the length of the force joint is equal to the length of the drill bit. The ribs at the back of the force joint and the groove at the front of the force joint are equipped with mounting grooves for placing the torque measurement strain gauge sensor; the propulsion force measurement strain gauge sensor is in the shape of a ring and is placed behind the force joint In the installation groove on the front end surface of the ribs, a power supply is also provided in the force joint to supply power for the torque measuring strain gauge sensor and the propulsion measuring strain gauge sensor. Among them, the torque measurement strain gauge sensor is specifically set in the mounting groove, which is the surface of the groove when the rib is rotated, that is, the radial surface of the rib in the direction of rotation of the drill bit; the front part of the force joint and the force joint The rear part defines the relative position of the two parts in the axial direction of the drill rod through a necking and a necking. The drill bit, the force measurement joint, and the drill pipe are provided with water injection holes along the longitudinal axis, and the drill bit, the force measurement joint and the drill pipe water injection holes are connected. [0054] Embodiment 3

[0055] This embodiment further explains the near-bit multi-parameter measurement method on the basis of Embodiment 1 or Embodiment 2, and further explains the beneficial effects of the present invention in combination with drilling pressure relief.

[0056] The main return airway in the west wing of a certain mine opens from the main return windmill in the west wing along the azimuth angle of 256° along 3. Drive uphill to the 13 05 track along the connecting lane, pass through the aeolian oxidation zone and the F11 and ZF1 faults, then drive forward along the 3 coal roof along an azimuth angle of 220°, and pass through the F3 fault to connect with the return wind uphill in the second mining area. During roadway driving, it is close to the fault area and is subjected to higher supporting pressure. If the support strength of the roadway surrounding rock is weak, the fracture movement of the overlying roof rock layer of the roadway will easily cause the roadway surrounding rock system to become unstable, and there is a certain impact risk; During the fault period, the superposition of higher supporting pressure and tectonic stress can easily activate the fault, causing sudden relative displacement of the fault and violent release of energy, causing the fault zone and the surrounding rock system of the upper and lower walls to become unstable, and the impact risk is high.

[0057] In the above-mentioned roadway with a dangerous area of rock burst construction drilling pressure relief, wherein the roadway is arranged frontally with 2 boreholes, spacing 2m, the pressure relief borehole diameter 110mm, the borehole distance from the roadway floor 1. 2m, the end of the borehole The hole position is located in the middle of the coal seam. The depth of the boreholes of the head and the side of the tunnel is 20m, and every time the roadway is driven 8m, that is, when the distance from the bottom of the borehole is 12m, the next round of drilling will be carried out, and the drilling will follow. Since the borehole is 20m long, it is necessary to use more than 10 drill pipes to complete the drilling pressure relief construction, and it is difficult to determine the stress situation of the drill bit position as the hole depth increases during the construction of the drilling pressure relief. Therefore, no further adjustments can be made to the drilling pressure relief parameters.

[0058] The steps of using the above-mentioned near-bit multi-parameter measurement method include:

[0059] Step 1. Determine the location of the borehole, specifically by positioning the location of the borehole by measuring and setting the line, the borehole is 1.2m away from the roadway floor, the borehole spacing is 2m, and the drilling device, measuring device and data transmission device are assembled at the same time , Prepare for construction drilling to relieve pressure.

[0060] Step 2. Start drilling, and at the same time as the drill bit advances, the rear of the force measurement section squeeze propulsion force measurement sensor (extrusion propulsion force fiber grating measurement sensor or squeeze propulsion force measurement strain gauge sensor), the signal of the measurement parameter The drill pipe is transmitted to the signal processor; the ribs and grooves are engaged, the squeeze torque measurement sensor (torque measurement fiber grating sensor or torque measurement strain gage sensor), parameter information is transmitted to the signal processor, and the signal processor is processed, And store data.

[0061] Step 3. The photoelectric rotary joint advances with the drill rod, approaching the drill gyrator along the slide rail, the hole depth is determined by the length of the drill rod connected to the optical fiber, and the rotational speed of the drill bit is determined by the photoelectric rotary joint. [0062] Step 4. Split the first drill rod and the photoelectric rotary joint, connect to the second drill rod, the photoelectric rotary joint is connected to the rear end of the second drill rod, and continue drilling; repeat the above step 4 until the full-length drill is completed hole.

[0063] The signal processor records the torque, rotation speed, drilling pressure and hole depth parameters of the drill bit, and compares the stress distribution curve with the drill bit torque, rotation speed, drilling pressure and hole depth parameters as shown in FIG. 9.

[0064] According to the drilling torque, rotation speed, drilling pressure and hole depth parameters, determine the stress concentration of the surrounding rock of the stressed roadway. According to the figure, there is still stress concentration in the surrounding rock of the roadway, and it is necessary to continue the construction of drilling and pressure relief. The length of the drill hole can be adjusted to 14m, which can better relieve the pressure in the stress concentration area and save the construction cost

[0065] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by those skilled in the art within the essential scope of the present invention are also It should belong to the protection scope of the present invention.

Claims

[Claim 1] A fiber grating-based near-drill multi-parameter measurement system, which is characterized in that it comprises a drilling device, a measuring device, and a data transmission device. The drilling device includes a drill bit, a drill rod, and a drill gyrator. The drilling device is drilled through a drill bit, the measuring device includes a force joint and a photoelectric rotary joint, and the force joint of the measuring device is connected to the drill bit and measures the torque, rotation speed, drilling pressure and hole depth parameters of the drill bit; the data transmission device It includes an optical fiber and a signal processor. The optical fiber of the data transmission device transmits the measurement parameters to the signal processor, and the signal processor receives and stores the measurement parameters; the rear end of the drill bit and the force joint are connected by a thread, and the rear end of the force joint is connected by a thread Connected to the drill pipe, the drill pipe passes through the drill rig gyrator, the rear end of the drill pipe is connected with a photoelectric rotary joint, and the drill rig gyrator and the photoelectric rotary joint are connected by a slide rail; the force measuring section includes the front part of the force measuring section and the force measuring section At the back, a groove is provided in the front of the force-measuring section, and ribs are provided at the rear of the force-measuring section, and the grooves and ribs are installed in cooperation; the front face of the rib at the rear of the force-measuring section is in contact with the front of the force-measuring section A propulsion measuring fiber grating sensor is arranged between the surfaces, and a torque measuring fiber grating sensor is arranged along the rib length direction; the drill pipe is connected with the rotor of the photoelectric rotary joint, and the stator of the photoelectric rotary joint is connected with the signal processor.

[Claim 2] A fiber grating-based multi-parameter measurement system for near-drill bits according to claim 1, wherein the front end of the force joint is connected to the drill bit through a thread and a slot, and the back end of the force joint passes The thread and the slot are connected with the drill pipe, and the length of the force measuring section is equal to the length of the drill bit.

[Claim 3] A fiber grating-based near-drill multi-parameter measurement system according to claim 2, characterized in that the ribs at the rear of the force joint and the grooves at the front of the force joint are both A mounting groove is provided for placing the torque measuring fiber grating sensor; the propulsion force measuring fiber grating sensor is in a circular ring shape and is placed in the mounting groove of the front end surface of the rib at the rear of the force measurement joint.

[Claim 4] A fiber grating-based near-drill multi-parameter measurement system according to claim 3, wherein the front part of the force measurement joint and the rear part of the force measurement joint are in the drill through a necking and a necking. The rod axially defines the relative position of the two parts.

[Claim 5] A fiber grating-based multi-parameter measurement system for a near-drill bit according to claim 3, wherein the drill bit, the force measurement joint, and the drill rod are provided with water injection along the longitudinal axis. Hole, drill bit, force measuring joint and drill pipe water injection hole are connected.

[Claim 6] A fiber grating-based near-bit multi-parameter measurement method, using the fiber grating-based near-bit multi-parameter measurement system of any one of claims 1 to 5, characterized in that the steps include: Step 1. Determine the location of the drilling hole, assemble the drilling device, measuring device and data transmission device; Step 2. Start drilling, and at the same time as the drill bit advances, the back of the force joint squeezes the propulsion force to measure the fiber grating sensor, and the optical fiber transmits the spectrum signal Transmit to the signal processor; the ribs and grooves are engaged, the squeeze torque is measured by the fiber grating sensor, and the optical fiber transmits the spectrum signal to the signal processor. Step 3. The photoelectric rotary joint advances with the drill pipe and approaches the drill gyrator along the slide rail. Determine the depth of the hole by the length of the drill rod connected to the optical fiber, and use the photoelectric rotary joint to determine the speed of the drill bit; Step 4. Split the first drill rod and the photoelectric rotary joint, and connect the second drill rod, the photoelectric rotary joint and the second drill rod The rear end of the drill bit is connected to continue drilling; the signal processor records the torque, speed, drilling pressure and hole depth parameters of the drill bit; repeat the above step four until the full-length drilling is completed.

[Claim 7] The method for measuring near-bit multi-parameters based on fiber grating according to claim 6, characterized in that, the drilling is a pressure relief drilling, and the drilling is based on the torque, rotation speed, and drilling pressure of the drilling. And hole depth parameters determine the pressure relief effect.