CN113153280B - Underground coal seam hydraulic fracturing drilling pressure relief and permeability improvement effect detection system and method - Google Patents
Underground coal seam hydraulic fracturing drilling pressure relief and permeability improvement effect detection system and method Download PDFInfo
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- 238000005553 drilling Methods 0.000 title claims abstract description 81
- 239000003245 coal Substances 0.000 title claims abstract description 54
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- 230000000694 effects Effects 0.000 title claims abstract description 29
- 230000035699 permeability Effects 0.000 title claims abstract description 23
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- 238000001514 detection method Methods 0.000 title claims description 32
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- 206010017076 Fracture Diseases 0.000 description 2
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- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
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Abstract
The invention discloses a system for detecting the pressure relief and permeability improvement effects of hydraulic fracturing drilling of an underground coal seam, which comprises a first group of micro-vibration sensors which are arranged on a coal wall of a tunnel at an opening side by taking the position of the opening of the drilling hole as the center, a second group of micro-vibration sensors which are arranged on the coal wall of the tunnel at an unapertured side, an underground data acquisition instrument and a ground monitoring host, wherein the first group of micro-vibration sensors and the second group of micro-vibration sensors comprise four micro-vibration sensors which are arranged in a rectangular shape, the output ends of the micro-vibration sensors are connected with the underground data acquisition instrument through signal wires, the underground data acquisition instrument is connected with the ground monitoring host through an underground optical cable, and a grid division calculation model of a target area space is arranged in the ground monitoring host; the invention also discloses a method for detecting the pressure relief and permeability improvement effects of the hydraulic fracturing drilling of the underground coal seam. The hydraulic fracturing drilling device is novel and reasonable in design, convenient to realize, high in data accuracy, strong in practicality, good in using effect and convenient to popularize and use, and can provide support for optimizing the hydraulic fracturing drilling process.
Description
Technical Field
The invention belongs to the field of underground coal mine hydraulic fracturing permeability-increasing and pressure-releasing, and particularly relates to a system and a method for detecting the hydraulic fracturing drilling pressure-releasing and permeability-increasing effects of an underground coal seam.
Background
Along with the gradual exhaustion of shallow coal resources, most of domestic mines are developed to deep mining, along with the supercharging of the mining depth, the ground stress is continuously increased, and mine dynamic disasters such as rock burst, coal and gas outburst and the like are increasingly serious. The coal seam pressure relief and permeability improvement technology not only can unload higher underground pressure, but also can increase the air permeability of the coal seam, is favorable for gas extraction and utilization, is widely applied to coal mine production at present, and is commonly provided with hydraulic measures such as hydraulic fracturing, hydraulic hole making, hydraulic slotting and the like, but because the influence range of the related measures and the pressure relief and permeability improvement effect of the coal seam are difficult to detect and master, the conventional flow method, pressure drop method and the like are required to be supplemented and provided with observation holes, the fracture structure of the coal seam is influenced, the result often has great error, and the actual production requirement is difficult to be met, so that a novel hydraulic slotting drilling pressure relief and permeability improvement effect detection method with high precision and good reliability is needed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the underground coal seam hydraulic fracturing drilling pressure relief and reflection increase effect detection system which has the advantages of simple structure, novel and reasonable design, convenient installation, small operation difficulty, small engineering quantity, high data accuracy, strong practicability, good use effect and convenient popularization and use.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides an underground coal seam hydraulic fracturing drilling release anti-reflection effect detecting system, includes and lays the first group of micro-vibration sensor on trompil side tunnel coal wall and lays the second group of micro-vibration sensor at the trompil side tunnel coal wall with drilling trompil position as the center, and is used for data acquisition's in-pit data collection appearance and the ground monitoring host computer that is used for data processing, four micro-vibration sensor that are the rectangle arrangement are all included to first group of micro-vibration sensor and second group micro-vibration sensor, four micro-vibration sensor's in the first group micro-vibration sensor horizontal interval is less than four micro-vibration sensor's in the second group micro-vibration sensor horizontal interval, four micro-vibration sensor's in the first group micro-vibration sensor vertical interval is less than four micro-vibration sensor's in the second group micro-vibration sensor vertical interval, four micro-vibration sensor's in the first group micro-vibration sensor output end with four micro-vibration sensor's in the second group micro-vibration sensor output end is all connected with the ground monitoring host computer through optical cable data acquisition underground data of underground data acquisition in-mining data logging underground data logging device and the underground data of the underground coal seam is used for carrying out the fracture effect of the underground area of the calculation.
According to the underground coal seam hydraulic fracturing drilling pressure relief and permeability improvement effect detection system, the horizontal spacing of the four micro-vibration sensors in the first group of micro-vibration sensors is 4m, and the vertical spacing of the four micro-vibration sensors in the first group of micro-vibration sensors is 3m; the horizontal spacing of four micro-vibration sensors in the second group of micro-vibration sensors is 10m, and the vertical spacing of four micro-vibration sensors in the second group of micro-vibration sensors is 4m.
According to the underground coal seam hydraulic fracturing drilling pressure relief and reflection increase effect detection system, the grid division calculation model comprises the cube block established in the target area space for carrying out underground coal seam hydraulic fracturing drilling pressure relief and reflection increase effect detection, and the three-dimensional coordinate system and the grids arranged on three faces of the cube block.
The invention also provides a method for detecting the pressure relief and permeability increasing effects of the hydraulic fracturing drilling holes of the underground coal seam, which is simple in steps, can analyze the damage condition of the coal and rock mass around the drilling holes in multiple directions such as axial direction, radial direction and the like, provides richer analysis results, and can provide support for the optimization of the hydraulic fracturing drilling process, and the method comprises the following steps:
step one, designing the installation position of a corresponding micro-vibration sensor according to the arrangement parameters of hydraulic fracturing drilling holes, and installing the micro-vibration sensor according to the designed installation position;
step two, connecting the micro-vibration sensor with an underground data acquisition instrument through a signal wire, and connecting the underground data acquisition instrument with a ground monitoring host through an underground optical cable;
step three, starting a detection system 15 days before hydraulic fracturing drilling construction, and detecting occurrence of a micro-vibration event within 15 days when no drilling construction exists in a target area for carrying out hydraulic fracturing drilling pressure relief and permeability increase effect detection of an underground coal seam; the underground data acquisition instrument acquires data detected by the micro-vibration sensor and transmits the data to the ground monitoring host for recording;
fourthly, hydraulic fracturing drilling construction, wherein the normal operation of a detection system is maintained in the construction process, and micro-vibration event signals in a target area for carrying out the detection of the hydraulic fracturing drilling pressure relief and permeability improvement effect of the underground coal seam are collected and recorded, and the normal operation of the detection system is still maintained until 15 days after the hydraulic fracturing construction is completed; the underground data acquisition instrument acquires data detected by the micro-vibration sensor and transmits the data to the ground monitoring host for recording;
step five, the ground monitoring host adopts the idea of grid division, three-dimensional grid division is carried out on the target area space, the drilling and tapping position is taken as the center, three-dimensional grid division is carried out on the basis of unit distance S, and the variation and accumulation of micro-vibration events in time, energy and space in each grid are respectively counted;
step six: analyzing the occurrence condition of the micro-vibration event in the target area 15 days before hydraulic fracturing drilling construction through a calculation result, and providing correction for a subsequent detection result by taking the result as a reference value;
step seven: analyzing the occurrence condition of micro-vibration events in each grid in a target area within 15 days from the beginning to the completion of hydraulic fracturing drilling construction through a calculation result, gradually reducing the assignment of energy and event number in the grid from the center of a drilling coordinate, and selecting an appropriate threshold value as the critical influence event number/energy value of the grid according to the space distribution state of data;
step eight: and drawing a contour map on the calculation result in the space grid by taking the selected threshold value as a critical value, wherein the threshold value boundary is the influence range of the hydraulic fracturing drilling.
The method further comprises a step nine after the step eight: and respectively analyzing the relation between the drilling influence range and the natural time, the fracturing time and the fracturing pressure parameters, and providing support for optimizing and upgrading the hydraulic fracturing process.
In the method, the arrangement parameters of the hydraulic fracturing drilling hole in the first step include hole depth, aperture, azimuth angle and inclination angle.
In the method, in the first step, when the micro-vibration sensors are installed according to the designed installation positions, the horizontal spacing of the four micro-vibration sensors in the first group of micro-vibration sensors is 4m, and the vertical spacing of the four micro-vibration sensors in the first group of micro-vibration sensors is 3m; the horizontal spacing of four micro-vibration sensors in the second group of micro-vibration sensors is 10m, and the vertical spacing of four micro-vibration sensors in the second group of micro-vibration sensors is 4m.
Compared with the prior art, the invention has the following advantages:
1. the underground coal seam hydraulic fracturing drilling pressure relief and reflection increase effect detection system is simple in structure, novel and reasonable in design, and is simple and convenient to arrange, and four micro-vibration sensors in the first group of micro-vibration sensors and four micro-vibration sensors in the second group of micro-vibration sensors all adopt rectangular topological structures.
2. When the micro-vibration sensor is distributed, the micro-vibration sensor is only required to be installed on a coal wall, and a non-intervention mode is adopted, so that no influence is generated on the internal structure of the coal seam, and the accuracy of data is ensured to the greatest extent.
3. The micro-vibration sensor is convenient to install, small in operation difficulty and small in engineering quantity.
4. According to the method for detecting the hydraulic fracturing drilling pressure relief and permeability increasing effect of the underground coal seam, disclosed by the invention, the micro-fracturing signals in the coal seam are detected through the high-precision micro-vibration sensor, the idea of three-dimensional space grid division is adopted, the energy, event number and other parameter distribution at different space positions is calculated, and the threshold value is selected, so that the influence range distribution condition of the hydraulic fracturing drilling on the three-dimensional space is determined, the method is simple in steps, the damage condition of coal and rock bodies around the drilling in multiple directions such as the axial direction and the radial direction can be analyzed, a richer analysis result is provided, and the method can be applied to hydraulic fracturing drilling pressure relief effect evaluation under different working conditions, and can provide support for optimizing the hydraulic fracturing drilling process.
In conclusion, the hydraulic fracturing drilling device is novel and reasonable in design, convenient to realize, high in data accuracy, strong in practicality, good in use effect and convenient to popularize and use, and can provide support for optimization of hydraulic fracturing drilling technology.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a schematic diagram of a micro-vibration sensor capturing micro-vibration signals according to the present invention.
FIG. 2 is a schematic diagram of the arrangement of the micro-vibration sensor of the present invention.
FIG. 3 is a schematic diagram of the connection relationship of the detection system of the present invention.
FIG. 4 is a schematic diagram of a meshing computing model of the present invention.
FIG. 5 is a schematic view of the radial extent of influence of the hydraulic fracturing process of the present invention.
Reference numerals illustrate:
1-a micro-vibration sensor; 2-a micro-fracture event; 3-drilling center coordinates;
4-grid; 5, drilling holes; 6, forming a hole on the coal wall of the roadway;
7, coal wall of the tunnel at the side without holes; 8-signal lines; 9, a data acquisition instrument;
10-a downhole optical cable; 11-horizon; 12-detecting a host;
13-threshold boundary.
Detailed Description
As shown in fig. 2, 3 and 4, the underground coal seam hydraulic fracturing drilling pressure relief and permeability increasing effect detection system comprises a first group of micro-vibration sensors which are arranged on a coal wall 6 of a drilling side roadway by taking the drilling position of a drilling hole 5 as the center, a second group of micro-vibration sensors which are arranged on a coal wall 7 of a non-drilling side roadway, a downhole data acquisition instrument 9 for data acquisition and a ground monitoring host 12 for data processing, wherein the first group of micro-vibration sensors and the second group of micro-vibration sensors comprise four micro-vibration sensors 1 which are arranged in a rectangular shape, the horizontal distance between the four micro-vibration sensors 1 in the first group of micro-vibration sensors is smaller than the horizontal distance between the four micro-vibration sensors 1 in the second group of micro-vibration sensors, the vertical distance between the four micro-vibration sensors 1 in the first group of micro-vibration sensors is smaller than the vertical distance between the four micro-vibration sensors 1 in the second group of micro-vibration sensors, the first group of micro-vibration sensors and the ground monitoring host 12 are connected with the downhole data acquisition end of the four micro-vibration sensors 1 in the first group of micro-vibration sensors through optical cable wires, and the underground data acquisition and the ground monitoring host 12 is used for calculating the permeability increasing effect of the underground coal seam hydraulic fracturing device is carried out by dividing the data between the four micro-vibration sensors 1 and the underground data acquisition pipeline 1 through the ground monitoring host 12.
In this embodiment, as shown in fig. 2, the horizontal spacing of the four micro-vibration sensors 1 in the first set of micro-vibration sensors is 4m, and the vertical spacing of the four micro-vibration sensors 1 in the first set of micro-vibration sensors is 3m; the horizontal spacing of the four micro-vibration sensors 1 in the second group of micro-vibration sensors is 10m, and the vertical spacing of the four micro-vibration sensors 1 in the second group of micro-vibration sensors is 4m.
FIG. 1 shows a schematic of the present invention employing a microvibration sensor to capture microvibration signals generated by a microvibration event 2 (hydraulic fracturing borehole).
In this embodiment, as shown in fig. 3, the meshing calculation model includes a cube block established in a target area space for performing underground coal seam hydraulic fracturing drilling pressure relief and anti-reflection effect detection, and a three-dimensional coordinate system and a plurality of grids 4 arranged on three faces of the cube block.
The method for detecting the pressure relief and permeability improvement effects of the hydraulic fracturing drilling of the underground coal seam by adopting the detection system comprises the following steps:
step one, designing the installation position of a corresponding micro-vibration sensor 1 according to the arrangement parameters of hydraulic fracturing drilling holes, and installing the micro-vibration sensor 1 according to the designed installation position;
step two, connecting the micro-vibration sensor 1 with an underground data acquisition instrument 9 through a signal wire 8, and connecting the underground data acquisition instrument 9 with a ground monitoring host 12 through an underground optical cable 10;
step three, starting a detection system 15 days before the hydraulic fracturing drilling 5 is constructed, and detecting the occurrence of a micro-vibration event within 15 days when no drilling construction exists in a target area for carrying out the detection of the hydraulic fracturing drilling pressure relief and permeability increasing effect of the underground coal seam; the underground data acquisition instrument 9 acquires the data detected by the micro-vibration sensor 1 and transmits the data to the ground monitoring host 12 for recording;
fourthly, constructing the hydraulic fracturing drilling hole 5, keeping the normal operation of the detection system in the construction process, collecting and recording micro-vibration event signals in a target area for detecting the pressure relief and permeability improvement effects of the hydraulic fracturing drilling hole of the underground coal seam, and keeping the normal operation of the detection system for 15 days after the hydraulic fracturing construction is completed; the underground data acquisition instrument 9 acquires the data detected by the micro-vibration sensor 1 and transmits the data to the ground monitoring host 12 for recording;
step five, the ground monitoring host 12 adopts the idea of grid division, performs three-dimensional grid division on the target area space, and performs three-dimensional grid division on the basis of the drilling hole position 3 as the center and the unit distance S, so as to respectively count the variation and accumulation of micro-vibration events in time, energy and space in each grid 4;
step six: analyzing the occurrence condition of the micro-vibration event in the target area 15 days before the hydraulic fracturing drilling 5 is constructed according to the calculation result, and providing correction for the subsequent detection result by taking the result as a reference value;
step seven: analyzing the occurrence condition of micro-vibration events in each grid 4 in a target area within 15 days from the beginning to the completion of the construction of the hydraulic fracturing drilling holes 5 through a calculation result, gradually reducing the assignment of energy and event numbers in the grids from the center of the drilling hole coordinates, and selecting an appropriate threshold value as the critical influence event number/energy value of the grids according to the space distribution state of the data;
step eight: and drawing a contour map on the calculation result in the space grid by taking the selected threshold value as a critical value, wherein the threshold value boundary 13 is the influence range of the hydraulic fracturing drilling hole, as shown in fig. 5.
In this embodiment, step eight further includes step nine: and respectively analyzing the relation between the drilling influence range and the natural time, the fracturing time and the fracturing pressure parameters, and providing support for optimizing and upgrading the hydraulic fracturing process.
In this embodiment, the layout parameters of the hydraulic fracturing drilling hole in the first step include a hole depth, a hole diameter, an azimuth angle and an inclination angle.
In this embodiment, in the first step, when the micro-vibration sensor 1 is installed according to the designed installation position, the horizontal spacing of the four micro-vibration sensors 1 in the first group of micro-vibration sensors is 4m, and the vertical spacing of the four micro-vibration sensors 1 in the first group of micro-vibration sensors is 3m; the horizontal spacing of the four micro-vibration sensors 1 in the second group of micro-vibration sensors is 10m, and the vertical spacing of the four micro-vibration sensors 1 in the second group of micro-vibration sensors is 4m.
According to the method, the micro-fracture signals in the coal seam are detected through the high-precision micro-vibration sensor, the thought of three-dimensional space grid division is adopted, the parameter distribution such as energy and event number at different space positions is calculated, the threshold value is selected, the influence range distribution condition of the hydraulic slotted drilling on the three-dimensional space is further determined, the method is simple in steps, the damage condition of coal and rock mass around the drilling in multiple directions such as the axial direction and the radial direction can be analyzed, a richer analysis result is provided, and support can be provided for optimizing the hydraulic fracturing drilling process.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (7)
1. The utility model provides an underground coal seam hydraulic fracturing drilling release anti-reflection effect detecting system which characterized in that: the underground data acquisition system comprises a first group of micro-vibration sensors which are arranged on a coal wall (6) of an open-hole side roadway by taking the open-hole position of a drill hole (5) as the center, a second group of micro-vibration sensors which are arranged on a coal wall (7) of an unopened side roadway, a down-hole data acquisition instrument (9) for data acquisition and a ground monitoring host (12) for data processing, wherein the first group of micro-vibration sensors and the second group of micro-vibration sensors comprise four micro-vibration sensors (1) which are arranged in a rectangular mode, the horizontal distance between the four micro-vibration sensors (1) in the first group of micro-vibration sensors is smaller than the horizontal distance between the four micro-vibration sensors (1) in the second group of micro-vibration sensors, the vertical distance between the four micro-vibration sensors (1) in the first group of micro-vibration sensors is smaller than the vertical distance between the four micro-vibration sensors (1) in the second group of micro-vibration sensors, the four micro-vibration sensors in the first group of micro-vibration sensors and the down-vibration sensors are connected with the down-hole data acquisition instrument (12) through an optical cable (1) in the first group of micro-vibration sensors and the down-hole data acquisition instrument (1) in the second group of micro-vibration sensors and the down-hole data acquisition instrument (12) in the first group of micro-vibration sensors, and the down-hole data acquisition instrument (1) are connected with the down-hole data acquisition instrument (12) through the down-hole data acquisition instrument and the down-hole data acquisition instrument (12) and the down-hole data acquisition pipeline and the down-plane data acquisition pipeline (12) and the underground data acquisition device and the underground pipeline.
2. The underground coal seam hydraulic fracturing drilling pressure relief and permeability improvement effect detection system according to claim 1, wherein: the horizontal spacing of the four micro-vibration sensors (1) in the first group of micro-vibration sensors is 4m, and the vertical spacing of the four micro-vibration sensors (1) in the first group of micro-vibration sensors is 3m; the horizontal spacing of the four micro-vibration sensors (1) in the second group of micro-vibration sensors is 10m, and the vertical spacing of the four micro-vibration sensors (1) in the second group of micro-vibration sensors is 4m.
3. The underground coal seam hydraulic fracturing drilling pressure relief and permeability improvement effect detection system according to claim 1, wherein: the grid division calculation model comprises a cube block established in a target area space for carrying out underground coal seam hydraulic fracturing drilling pressure relief and reflection increase effect detection, a three-dimensional coordinate system arranged on three faces of the cube block and a plurality of grids.
4. A method for detecting the pressure relief and permeability improvement effects of hydraulic fracturing drilling of an underground coal seam by using the detection system as claimed in claim 3, wherein the method comprises the following steps:
step one, designing the installation position of a corresponding micro-vibration sensor (1) according to the arrangement parameters of hydraulic fracturing drilling holes, and installing the micro-vibration sensor (1) according to the designed installation position;
step two, connecting the micro-vibration sensor (1) with an underground data acquisition instrument (9) through a signal wire (8), and connecting the underground data acquisition instrument (9) with a ground monitoring host (12) through an underground optical cable (10);
step three, 15 days before the hydraulic fracturing drilling (5) is constructed, a detection system is started, and the occurrence of a micro-vibration event within 15 days when no drilling construction exists in a target area for carrying out the detection of the hydraulic fracturing drilling pressure relief and permeability increasing effect of the underground coal seam is detected; the underground data acquisition instrument (9) acquires the data detected by the micro-vibration sensor (1) and transmits the data to the ground monitoring host (12) for recording;
fourthly, constructing a hydraulic fracturing drilling hole (5), keeping the normal operation of a detection system in the construction process, collecting and recording micro-vibration event signals in a target area for detecting the pressure relief and permeability increase effects of the hydraulic fracturing drilling hole of the underground coal seam, and keeping the normal operation of the detection system for 15 days after the hydraulic fracturing construction is completed; the underground data acquisition instrument (9) acquires the data detected by the micro-vibration sensor (1) and transmits the data to the ground monitoring host (12) for recording;
step five, the ground monitoring host (12) adopts the idea of grid division, performs three-dimensional grid division on the target area space, performs three-dimensional grid division on the basis of a drilling hole position (3) as a center and a unit distance S, and respectively counts the variation and accumulation of micro-vibration events in time, energy and space in each grid (4);
step six: analyzing the occurrence condition of a micro-vibration event in a target area 15 days before the hydraulic fracturing drilling (5) is constructed according to the calculation result, and providing correction for the follow-up detection result by taking the result as a reference value;
step seven: analyzing the occurrence condition of micro-vibration events in each grid (4) in a target area from the beginning to the completion of the construction of the hydraulic fracturing drilling holes (5) through a calculation result, gradually reducing the assignment of energy and event numbers in the grids from the center of the drilling coordinates outwards, and selecting an appropriate threshold value as the critical influence event number/energy value of the grids according to the space distribution state of data;
step eight: and drawing a contour map on the calculation result in the space grid by taking the selected threshold value as a critical value, wherein the threshold value boundary (13) is the influence range of the hydraulic fracturing drilling.
5. The method of claim 4, wherein: step eight further comprises step nine: and respectively analyzing the relation between the drilling influence range and the natural time, the fracturing time and the fracturing pressure parameters, and providing support for optimizing and upgrading the hydraulic fracturing process.
6. A method according to claim 4 or 5, characterized in that: the arrangement parameters of the hydraulic fracturing drilling holes in the first step comprise hole depth, aperture, azimuth angle and inclination angle.
7. A method according to claim 4 or 5, characterized in that: when the micro-vibration sensors (1) are installed according to the designed installation positions, the horizontal spacing of the four micro-vibration sensors (1) in the first group of micro-vibration sensors is 4m, and the vertical spacing of the four micro-vibration sensors (1) in the first group of micro-vibration sensors is 3m; the horizontal spacing of the four micro-vibration sensors (1) in the second group of micro-vibration sensors is 10m, and the vertical spacing of the four micro-vibration sensors (1) in the second group of micro-vibration sensors is 4m.
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