CN110714750A - Comprehensive monitoring method for segmented hydraulic fracturing of coal seam with hard roof combined with well-ground - Google Patents

Abstract

A comprehensive monitoring method for segmented hydraulic fracturing of coal seam with combined wells and ground, using in-hole video detection technology combined with audio electro-perspective technology to reveal the location and degree of fracture development under original conditions, and to identify the original low formation of the working face. area. Through the microseismic monitoring system, the fracture development level and profile distribution characteristics during the fracturing process are carried out in real time. After fracturing, the video and audio-frequency electro-perspective detection results in the borehole are used to synthesize the microseismic test results to obtain the fracturing fracture initiation position, direction, fracture development scale, and distribution shape. Effectively revealing the location and direction of fracturing fractures, combined with the scale and shape of fracture development, it provides technical support for the precise design of directional long drilling trajectories and controllable parameters, which can improve drilling efficiency and reduce the difficulty of drilling construction. It avoids the monitoring of blind spots and blind sections by conventional methods, greatly improves the monitoring accuracy, and accurately evaluates the fracturing effect.

Description

Comprehensive monitoring method for segmented hydraulic fracturing of coal seam with hard roof combined with well-ground

technical field

The invention relates to the technical field of underground safety in coal mines, in particular to a comprehensive monitoring method for segmented hydraulic fracturing of a coal seam hard roof with a well-ground combination.

Background technique

Hard and difficult-to-collapse roofs are widely developed in my country's coal seams. In the process of mine production, such roofs are difficult to collapse in time, and it is easy to form a large area of overhanging in the goaf. One-time concentrated collapse is often accompanied by strong dynamic load impact on the mine. The crushing phenomenon caused the crushing of the working face support, equipment damage, serious deformation of the floor drum and the help drum of the roadway affected by the mining, the failure of the original support, and even a vicious accident that endangered personal safety.

With the continuous in-depth research on the control measures of hard roofs at home and abroad in recent years, scholars in related fields have proposed forced roof caving measures. Prefabricated cracks are formed by manual intervention in advance, which reduces the strength of the roof along the direction of the cracks, thereby weakening the overall strength of the rigid roof and making it easier to collapse, reducing the overhanging length of the rigid roof and thus reducing the compressive strength. The blasting method is simple to construct, but has a large amount of engineering, high cost, large amount of gunpowder, high risk factor, and toxic gases such as CO generated by blasting pollute the underground environment, and there are potential safety hazards for high-gas mines. Therefore, safe and efficient high-pressure hydraulic fracturing hard roof weakening technology has been widely used and promoted.

However, the traditional short-hole hydraulic fracturing technology has problems such as low drilling accuracy, short effective fracturing length, and poor open-hole sealing effect. The problem is more prominent. In response to the above problems, China Coal Science and Industry Group Xi'an Research Institute Co., Ltd. introduced the oil and gas extraction fracturing technology in the oil system, miniaturized the fracturing equipment, and carried out adaptive transformation under the conditions of underground construction. Hole length> 400m) new technology of segmented roof fracturing weakening for bare holes, to carry out hard roof fracturing weakening treatment. This technology has the advantages of precise and controllable drilling trajectory, large effective fracturing section length, large fracturing pump set displacement, and large fracturing fracture extension radius, so as to achieve the weakening treatment of hard roof hydraulic fracturing in the entire working face. Through field engineering test application, according to the analysis of fracturing data curve results, the rock fracture pressure drop is obvious. During the mining process of the working face, there is no phenomenon of strong mineral pressure in the fracturing control area, and good expected results have been achieved.

Accurately grasping the geometry and extension of the roof segmented hydraulic fracturing fractures plays an important guiding role in evaluating the weakening effect of the hard roof, checking and improving the accuracy of the fracturing design, and improving the quality of the forced caving of the hard roof. The existing fracturing weakening technology of underground hard roof in coal mines mostly uses the pressure and flow rate curve during the fracturing process, and adopts the downhole peeping and micro-seismic monitoring technology to evaluate the fracturing effect. However, the monitoring and analysis of the fracturing data during the fracturing process can only indirectly reflect whether the fracturing has formed a certain scale of fractures, and cannot show the distribution shape, size and extension direction of the fractures. Observation and recording of borehole wall images, testing methods to reflect the borehole wall structure, fracture development degree, and other geological phenomena in the well, etc., can intuitively record and display the fracture initiation position and basic shape, but it is limited to the use of cable transmission technology. The signal cannot be detected and recorded for deep holes (>200m), and it can only reveal the development of cracks on the wall of the borehole, but cannot reflect information such as the extension length and width of the cracks. During the fracturing process, with the injection of fracturing fluid, the pressure in the pores rises rapidly, causing the rock to break. In the process of rock rupture, a series of micro-seismic waves and sound waves will be generated, which are commonly known as "micro-earthquakes" because the energy released is much smaller than that of conventional seismic waves. By arranging monitoring instruments in the fracturing monitoring area and receiving wave energy signals, the microseismic source, i.e. the rock fracture initiation location, can be determined. However, microseismic can only reflect the spatial location and direction of fracture development, and cannot determine the extent and development of fracturing fractures. The shape of the cloth can be accurately positioned.

For this reason, in view of the above-mentioned defects, the designer of the present invention has researched and designed a well-ground combined coal seam hard roof segmented hydraulic fracturing comprehensive monitoring system through intensive research and design, combining the long-term experience and achievements in related industries for many years. method to overcome the above shortcomings.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a comprehensive monitoring method for segmented hydraulic fracturing of a coal seam with a combined well and ground, so as to realize the combined three-dimensional integration before, during and after fracturing of the segmented hydraulic fracturing of a hard roof in a coal mine, as well as on the ground and underground. Monitor, transparently display the distribution shape and extension direction of fracturing fractures, accurately evaluate the fracturing weakening effect of hard roofs, and provide technical and data support for testing and improving the accuracy of fracturing design and improving the quality of forced caving of hard roofs. Overcome the above technical defects.

In order to achieve the above purpose, the present invention discloses a comprehensive monitoring method for segmented hydraulic fracturing of hard roof of coal seams combined with wells and ground, which is characterized by comprising the following steps:

Step 1: Transport the in-hole TV detection device into the fracturing borehole, conduct video scanning of the inner wall of the hole by pulling at an average speed, and conduct real-time monitoring of monitoring videos, photos and data through the data acquisition and video and picture recording system outside the hole , to grasp the development of cracks in the borehole under the original conditions, fix the power supply electrode and move the measurement electrode, perform a sector scan on the working face with the emission point as the center, cover the entire working face, detect and divide the surrounding original low-resistance area;

Step 2: Arrange multiple microseismic signal monitoring points in two downhole grooves to monitor the location of microseismic occurrence within a vertical range of 30m; arrange multiple microseismic signal monitoring points on the ground corresponding to the fracturing area, supplemented by monitoring the plane fracturing area Real-time and accurate monitoring and analysis of the development of fracturing fractures on the working face level and profile;

Step 3: After fracturing, obtain the fracturing fracture initiation position and direction; obtain the resistivity distribution characteristics of the fracturing area, combine the pre-fracturing detection results, compare and analyze the development scale and distribution shape of the fracturing fracture, and integrate the surface and downhole microseismic Real-time monitoring results to identify the fracture initiation position, direction, fracture development scale and distribution pattern;

Step 4: After the monitoring and revealing of fracturing fractures is completed, monitor the characteristics of mineral pressure during the mining process in the area affected by the development of fractures, the deformation along the groove and the working face, and compare and analyze it with the non-fracturing area to accurately evaluate the fracturing effect. Under the conditions, the area will be treated, and a better and accurate design basis will be provided.

Wherein: operate simultaneously in two parallel grooves of the working surface, set audio electro-perspective signal receiving points and audio-electric fluoroscopy signal power supply points on both sides, the audio-electric fluoroscopy signal receiving points accommodate the moving measuring electrodes, and the audio electro-perspective signal receiving points The power supply point of the fluoroscopy signal accommodates the transmitting electrodes for power supply, the distance between the transmitting electrodes is 20m, and the distance between the receiving points of the audio frequency electro-fluoroscopy signal is 5m.

Among them: the transmitting electrode continues to emit, and the moving measuring electrode moves at an interval of 5m until it moves 20m to the position of the next transmitting electrode, and this cycle is repeated until the entire working surface is covered.

Among them: 1 to 15 microseismic signal monitoring points are arranged in the two parallel grooves of the well to collect the microseismic spatiotemporal parameter information of the working face plane position, and to monitor the working face plane microseismic, that is, the fracture position of the rock formation during the fracturing process, supplemented by monitoring the vertical 30m Microseismic occurrence locations within the range; microseismic signal monitoring points No. 16 to 28 are arranged on the ground corresponding to the fracturing area to monitor the microseismic location of the working face section, that is, the fracture location of the rock formation during the fracturing process, supplemented by monitoring the occurrence of microseisms in the plane fracturing area Location.

Among them: According to the real-time monitoring and recording data results of all surface and downhole microseismic signals monitored during the fracturing process, a three-dimensional energy dynamic change scattergram is drawn. Determine the location of fracture initiation for each fracturing section and fracturing borehole.

Among them: the concentrated distribution and extension direction of the energy dispersion points of a single fracturing section and borehole in the microseismic test results are coupled with the low-resistivity direction displayed by the final result of the audio-electrical fluoroscopy test, so as to identify the fracture initiation direction of the fracturing fracture; The data of the three-dimensional test results of audio-electric fluoroscopy and microseismic were comprehensively processed, and the fracturing influence range with the smallest exposure in the two methods was used as the boundary to draw a three-dimensional image of the fracturing influence azimuth to reveal the development scale and distribution shape of the fracturing fractures.

As can be seen from the above content, the comprehensive monitoring method for segmented hydraulic fracturing of coal seam hard roof combined with well-ground combination of the present invention has the following effects:

1. Established real-time and dynamic monitoring of fracturing fracture development characteristics in time and space, which can realize effective data recording and analysis, and reveal the spatial distribution scale and shape of fracturing fractures with multiple methods, multiple means, and high precision;

2. It can effectively reveal the location and direction of fracturing fractures. Combined with the scale and shape of fracture development, it provides technical support for accurate design of directional long drilling trajectory and controllable parameters, which can improve drilling efficiency and reduce the difficulty of drilling construction. .

3. Through multi-method three-dimensional comprehensive detection, the full coverage monitoring of the fracturing area is realized, and the blind area and blind section of the conventional method are avoided, which greatly improves the monitoring accuracy and accurately evaluates the fracturing effect.

The details of the present invention can be obtained from the description to be described later and the accompanying drawings.

Description of drawings

Fig. 1 shows the flow chart of the comprehensive monitoring method for hydraulic fracturing of coal seam hard roof sections combined with well-ground according to the present invention.

Fig. 2 shows the detection map of the initial fractures and the low-resistance area in the hole in the fracturing area before the fracturing of the present invention.

FIG. 3 shows a monitoring diagram of the fracture initiation position and development scale of the fracture in the fracturing area during the fracturing process of the present invention.

FIG. 4 shows the crack initiation position and crack direction in the hole after fracturing according to the present invention, and the detection map of the low resistance area.

Figure 5 shows a cross-sectional layout of the fracturing borehole of the present invention.

Reference number:

为微震井下布置监测点，9.

为微震地面布置监测点。1. The first drilling hole, 2. The second drilling hole, 2. 3. TV detection device in the hole, 4. Data acquisition and video picture recording system outside the hole, 5. Audio electric fluoroscopy signal receiving point, 6. Audio electric fluoroscopy signal Power Point, 7. Fracturing Fractures, 8

Layout monitoring points for microseismic wells, 9.

Deploy monitoring points for microseismic ground.

Detailed ways

Referring to Fig. 1 to Fig. 5, it shows the comprehensive monitoring method for hydraulic fracturing of coal seam with hard roof in combination with well and ground according to the present invention.

The comprehensive monitoring method for segmented hydraulic fracturing of the coal seam with hard roof combined with the well-ground combines a variety of monitoring methods such as audio electro-perspective, micro-seismic, and downhole TV, through the comprehensive monitoring before, during and after the coal seam hard roof hydraulic fracturing. , through the combined three-dimensional analysis of ground and downhole, to achieve three-dimensional space-time monitoring of fracturing fractures, transparently display the distribution shape and extension direction of fracturing fractures, and accurately evaluate the weakening effect of hard roof fracturing. It specifically includes the following steps (see Figure 1):

Step 1: Monitoring before fracturing, including audio electro-perspective and in-hole transient electromagnetic and downhole in-hole TV, the down-hole in-hole TV can be the first borehole 1 or At the 200m fracturing position in the second borehole 2, the orifice is powered and signaled by an explosion-proof computer, and the optical cable is used to transmit the signal to the probe in the TV detection device 3 in the borehole. The out-of-hole data acquisition and video picture recording system 4 outside the hole stores the video recording results, and takes local pictures at the cracks found in the video. After taking pictures and video recordings at the position, the video scanning of the inner wall of the hole is carried out by means of pulling and pulling at a uniform speed, and each video scanning is recorded at an interval of 1 m. After the scanning of the entire fracturing section is completed, the real-time recording and storage of monitoring videos, photos and data by the out-hole data acquisition and video picture recording system 4 is completed. All the videos and photos have their own coordinate systems. Using the analysis of videos and photos, combined with the coordinate systems in the photos and videos, we can grasp the development scale and direction of fissures in the borehole under the original conditions. The audio electro-perspective and the transient electromagnetic in the hole can be included in the two parallel grooves of the working surface and operate at the same time, and the audio electro-perspective signal receiving point 5 and the audio electro-perspective signal power supply point 6 are arranged on both sides. The receiving point 5 accommodates the moving measuring electrodes, the audio electro-perspective signal power supply point 6 accommodates the transmitting electrodes for power supply, the transmitting electrodes are spaced 20m apart, and the receiving points 5 of the audio electro-perspective signals are spaced 5m apart, and a single transmitting electrode transmits a signal through The coal mining face is transmitted to the moving measuring electrode. The transmitting electrode continues to emit, and the moving measuring electrode moves at an interval of 5m until it moves 20m to the position of the next transmitting electrode, and this cycle is repeated until the entire working surface is covered. The moving measuring electrodes have the function of having electrical signal values, and the data correspondingly store the three-dimensional coordinate values of X, y, and z. Perform a sector scan on the working surface with the emission point as the center, after covering the entire working surface, export the detected resistivity value with a three-dimensional coordinate system stored by the moving measuring electrode, and process the plane and three-dimensional resistivity map through software processing. , to divide the original low-resistance area of the fracturing treatment area.

Step 2: Monitoring during the fracturing process, which can include microseismic system and pressure and flow data collection. When fracturing is performed in the monitoring area, the coal and rock mass will be cracked, and new large-scale cracks will be formed. When a micro-seismic or large vibration occurs, the micro-seismic signal sensor can pick up the signal and convert this physical quantity into a voltage or charge. Through multi-point synchronous data acquisition, the moment when each sensor receives the signal is determined, together with the coordinates of each sensor. and the measured wave velocity, the microseismic source, that is, the spatiotemporal parameters of the rupture, can be determined, mainly including the X, Y, Z spatial coordinates of the rupture point and the magnitude of the energy J. Through data conversion and processing, the rupture location can be determined in three dimensions. It is displayed in space to achieve the purpose of precise positioning. Based on the above principles, microseismic signal monitoring points No. 1 to 15 are arranged in two parallel grooves in the well, mainly to collect the microseismic spatiotemporal parameter information of the plane position of the working face, and to monitor the plane microseism of the working face, that is, the fracture position of the rock formation during the fracturing process, supplemented by monitoring Microseismic occurrence position within a vertical range of 30m; microseismic signal monitoring points No. 16 to 28 are arranged at the corresponding fracturing area on the ground, mainly to monitor the microseismic position of the working face section, that is, the fracture position of the rock formation during the fracturing process, supplemented by the monitoring of plane fracturing The location of microseisms in the region. Using the three-dimensional space-time parameters of microseismic on the ground and downhole, project it into a three-dimensional coordinate map to determine the fracturing location, energy size and direction, so as to realize real-time and accurate monitoring and analysis of the development of fracturing fractures on the working face and profile.

Step 3: Monitoring after fracturing, which can include audio electro-perspective, in-hole transient electromagnetic and downhole in-hole TV, and use the in-hole in-hole TV detection device 3 to be transported into the fracturing borehole, and the fracturing is carried out according to step 1. The video detection in the borehole is performed in the order of performing the in-hole crack detection, and the results of the in-hole video detection in the hole in step 1 are compared and analyzed, the fracturing fractures formed after fracturing are screened, and the development range of the fracturing fracture hole wall is obtained; The three-dimensional distribution of resistivity of the audio-frequency electro-perspective test before fracturing was compared with the resistivity results of the test after fracturing, and the scope of the affected area of fracturing was analyzed. The comparison data is mainly based on the resistivity value before fracturing, which is converted from the difference between the data after fracturing and the resistivity value before fracturing, and uses the data to draw a three-dimensional three-dimensional map of the resistivity distribution characteristics of the fracturing area, so as to show The development scale and distribution form of fracturing fractures. According to the real-time monitoring and recording data results of all the surface and downhole microseismic signals monitored during the fracturing process, a three-dimensional energy dynamic change scattergram is drawn. Fracture initiation position of the fracturing section and fracturing borehole; the direction of the concentrated distribution and extension of the energy dispersion points of a single fracturing section and borehole in the microseismic test results and the low resistivity direction shown by the final result of the audio-electric fluoroscopy test Coupling to identify the initiation direction of fracturing fractures; comprehensively process the data from the 3D test results of audio electro-perspective and microseismic, and draw the 3D image of the fracturing influence azimuth with the least exposed fracturing influence range of the two methods as the boundary , revealing the development scale and distribution pattern of fracturing fractures.

Step 4: After the monitoring and revealing of fracturing fractures is completed, the "three shifts and three downs" are adopted for 24 hours to monitor the characteristics of mineral pressure during the mining process in the area affected by the development of fractures, and the deformation along the groove and working face, and compare and analyze it with the non-fracturing area. Evaluate the fracturing effect. According to the shape, scale and direction of fractures after fracturing, and the effect of fracturing treatment, parameters such as the number of fracturing boreholes, the length of boreholes and the spacing of boreholes under such geological conditions are screened out, and the geological conditions of this type are designed. The fracturing combination parameters such as the number of fracturing stages in a single hole and the spacing of each fracturing stage are set to ensure the fracturing control effect. The selection of the above parameter combinations can provide a better and more accurate design basis for the treatment area under similar geological conditions.

It can be seen that the three-dimensional comprehensive spatiotemporal monitoring technology for the effect of segmented hydraulic fracturing on the hard roof of the coal seam combined with the well and the ground of the present invention has the following advantages:

(1) Fracturing fracture spatiotemporal monitoring design

Taking the hydraulic fracturing fractures in the downhole directional long borehole as the monitoring object, the dynamic development characteristics of the fracturing fractures formed in continuous time before, during and after the fracturing are monitored in time. Monitoring instruments are arranged in the trough and coal seam floor to conduct comprehensive three-dimensional monitoring of fractures, reveal the distribution pattern and extension direction of fracturing fractures, and comprehensively evaluate the fracturing effect.

(2) Detection of fissures in boreholes and surrounding low-resistance areas under original conditions: Using in-hole television detection technology, and using plane reflective automatic camera instruments to observe and record images of borehole walls, showing the combination of the development position and degree of fissures under original conditions; Before fracturing, the audio electro-fluoroscopy technology tests the resistivity distribution characteristics of the fracturing area, and identifies the original low-group area of the working face.

(3) Detection of fracture plane and profile development position during the fracturing process: The vertical distribution characteristics of fracture development position during the fracturing process can be measured in real time through the ground microseismic monitoring system; The development of fracturing fractures in the working face is accurately monitored and analyzed.

(4) After fracturing, obtain the fracturing fracture initiation position, direction, fracture development scale, and distribution shape: use the video detection results in the holes after fracturing, combined with the video detection results in the holes before fracturing, to determine the initiation of fracturing fractures The location and direction of the fracturing were analyzed; the resistivity distribution characteristics of the fracturing area were analyzed by audio-frequency electro-perspective after fracturing, and the development scale and distribution pattern of fracturing fractures were compared and analyzed in combination with the detection results before fracturing. Based on the real-time monitoring results of surface and downhole microseismic monitoring, the location and direction of fracture initiation, the development scale and distribution form of fractures can be identified.

(5) Analysis of fracturing effect on hard roof: After the monitoring and revealing of fracturing fractures is completed, according to the characteristics of mineral pressure in the mining process in the affected area of monitoring fracture development, the deformation along the groove and working face, and the unfractured area are compared and analyzed, accurate and accurate. Evaluating the fracturing effect provides a more accurate design basis for regional governance under similar geological conditions.

It will be apparent that the above descriptions and records are merely examples and are not intended to limit the disclosure, application, or uses of the present invention. While the embodiments have been described and described in the accompanying drawings, this invention is not limited to the specific examples illustrated by the drawings and described in the embodiments as the best mode presently believed to be for carrying out the teachings of this invention. , the scope of the invention shall include any embodiments falling within the preceding description and appended claims.

Claims (6)

1. a coal seam hard roof section hydraulic fracturing comprehensive monitoring method of well-ground combination is characterized in that comprising the steps: Step 1: The in-hole TV detection device is transported into the fracturing borehole, and the video scanning of the inner wall of the hole is carried out by means of uniform speed pulling, and the monitoring video, photos and data are monitored through the data acquisition and video and picture recording system outside the hole. Real-time monitoring, grasp the development of cracks in the borehole under the original conditions, fix the power supply electrode and move the measurement electrode, perform a sector scan on the working face with the emission point as the center, cover the entire working face, and detect and divide the surrounding original low-resistance area; Step 2: Arrange multiple microseismic signal monitoring points in two downhole grooves to monitor the location of microseismic occurrence within a vertical range of 30m; arrange multiple microseismic signal monitoring points on the ground corresponding to the fracturing area, supplemented by monitoring the plane fracturing area Real-time and accurate monitoring and analysis of the development of fracturing fractures on the working face level and profile; Step 3: After fracturing, obtain the fracturing fracture initiation position and direction; obtain the resistivity distribution characteristics of the fracturing area, combine the pre-fracturing detection results, compare and analyze the development scale and distribution shape of the fracturing fracture, and integrate the surface and downhole microseismic Real-time monitoring results to identify the fracture initiation position, direction, fracture development scale and distribution pattern; Step 4: After the monitoring and revealing of fracturing fractures is completed, monitor the characteristics of mineral pressure during the mining process in the area affected by the development of fractures, the deformation along the groove and the working face, and compare and analyze it with the non-fracturing area to accurately evaluate the fracturing effect. Under the conditions, the area will be treated, and a better and accurate design basis will be provided. 2. The comprehensive monitoring method for segmented hydraulic fracturing of coal seam hard roof combined with well-ground as claimed in claim 1, is characterized in that: operate simultaneously in two parallel grooves of working face, and set audio frequency electro-perspective signal reception on both sides point and the power supply point of the audio electro-perspective signal, the audio electro-perspective signal receiving point accommodates the moving measuring electrode, the audio electro-perspective signal power supply point accommodates the power-supplying transmitting electrode, each transmitting electrode is spaced 20m apart, and each audio electro-perspective signal is The receiving points are separated by 5m. 3. The comprehensive monitoring method for segmented hydraulic fracturing of coal seam hard roof combined with well-ground as claimed in claim 1, is characterized in that: the transmitting electrode continuously emits, and the moving measuring electrode moves at intervals of 5m, until the moving 20m reaches the next The position of the emitter electrode, and so on, until the entire working surface is covered. 4. The comprehensive monitoring method for segmented hydraulic fracturing of coal seam hard roof combined with well-ground as claimed in claim 1, characterized in that: microseismic signal monitoring points No. 1 to No. 15 are arranged in two parallel grooves in the well, and the working face plane is collected. The microseismic spatiotemporal parameter information of the location is used to monitor the plane microseismic of the working face, that is, the fracture position of the rock formation during the fracturing process, supplemented by monitoring the location of the microseismic occurrence within a vertical range of 30m; the microseismic signal monitoring of No. 16 to 28 is arranged at the corresponding fracturing area on the ground The microseismic position of the working face profile position, that is, the fracture position of the rock formation during the fracturing process is monitored, supplemented by the monitoring of the microseismic occurrence position in the plane fracturing area. 5. The comprehensive monitoring method for segmented hydraulic fracturing of coal seam hard roof combined with well ground as claimed in claim 1, characterized in that: real-time monitoring and recording data according to all ground and downhole microseismic signals monitored in the fracturing completion process As a result, a three-dimensional energy dynamic change scattergram was drawn, and the fracture initiation positions of each fracturing section and fracturing borehole were determined by observing the location of the hypocenter, combined with the video and images of the TV detection in the borehole. 6. The comprehensive monitoring method for segmented hydraulic fracturing of coal seams combined with well-ground as claimed in claim 5, characterized in that: in the microseismic test results, the energy dispersion points of a single fracturing segment and a borehole are distributed and extended. The direction of the fracturing fracture is coupled with the low resistivity direction shown by the final result of the audio electro-fluoroscopy test to identify the fracture initiation direction; the audio electro-fluoroscopy and the three-dimensional test results of the microseismic test are comprehensively processed, and the smallest of the two methods is used. The exposed fracturing influence range is used as the boundary, and a three-dimensional image of the fracturing influence azimuth is drawn to reveal the development scale and distribution shape of the fracturing fractures.

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