A method for preventing and treating rock burst and mine earthquake combined disasters in ground F-type well fracturing

Abstract

This invention discloses a method for preventing combined rockburst and mine-induced seismic disasters using surface F-type well fracturing. The method includes: determining multiple key layers in a thick roof using key layer theory; establishing a disaster-causing control layer model using a surface and underground microseismic monitoring system; identifying the location of the disaster-causing control layer within the multiple key layers, including both rockburst and mine-induced seismic control layers; establishing a surface F-type well fracturing prevention scheme based on the location, thickness, and strata information of the rockburst and mine-induced seismic control layers; conducting scheme tests; and revising the scheme based on the test results. Based on the revised surface F-type well fracturing prevention scheme and the disaster-causing control layer model, coordinated fracturing prevention operations are performed on thick roofs with locations of either rockburst or mine-induced seismic control layers. The effectiveness of the coordinated prevention and control of combined rockburst and mine-induced seismic disasters is then verified. This invention can achieve coordinated prevention and control of combined rockburst and mine-induced seismic disasters induced by thick roofs.

Description

Technical Field

[0001] This invention relates to the field of coal seam rockburst prevention and control technology, and in particular to a method for preventing combined rockburst and mine earthquake disasters by fracturing F-type wells on the ground. Background Technology

[0002] In recent years, as coal mining has gradually shifted to the west, mine tremors and rock bursts have appeared with unprecedented frequency in the Shaanxi and Inner Mongolia regions. Although they have not caused serious mine disasters, the strong ground tremors have made mine tremors a sensitive topic and caused social panic.

[0003] Currently, the prevention and control of mine-induced seismic and rockburst problems in the Shaanxi-Inner Mongolia region faces the following issues: Firstly, treatment is often carried out only after a seismic event has occurred, based on the seismic strata. This often results in ineffective treatment, unclear target strata, and an attempt to broaden the treatment scope to cover the target strata, leading to a degree of blindness in the treatment process. Secondly, in practical engineering applications, the application of various technical means lacks reliable theoretical basis, and the effectiveness of these measures lacks reliable and accurate evaluation methods. Often, the presence of seismic or rockburst events is used as an indicator, requiring continuous adjustments to various plans based on actual treatment results. Mines can only address these issues after they have manifested, resulting in a reactive approach to prevention. Thirdly, due to the wide distribution of thick, hard roofs in the Shaanxi-Inner Mongolia region, and the varying hazard properties of thick, hard roofs at different strata, roof control projects are carried out both underground and on the surface within the same mine. This lack of coordination in the treatment of thick, hard roofs at different strata leads to large-scale, costly, and inefficient roof control projects. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] To achieve the above objectives, this invention proposes a method for preventing combined rockburst and mine tremor disasters by fracturing F-type wells on the surface, comprising the following steps:

[0006] S1. Based on the key layer theory, multiple key layers of the thick roof are determined, and a disaster-causing main control layer model is established using a microseismic monitoring system both above and below ground. The location of the main control layer for impact disaster and the location of the main control layer for mine earthquake disaster are determined by combining the key layer and the disaster-causing main control layer model.

[0007] S2. Based on the location, thickness, and strata information of the main control layers for impact disasters and mine earthquake disasters, a surface F-type well fracturing prevention and control scheme is established to coordinate the treatment of the main control layers for impact disasters and mine earthquake disasters. The surface F-type well fracturing prevention and control scheme is tested on-site, and the scheme is revised based on the test results.

[0008] S3. Based on the revised surface F-type well fracturing prevention and control plan and the disaster-causing main control layer model, carry out coordinated fracturing prevention and control operations on the thick roof with the location of the main control layer for impact disaster or the main control layer for mine earthquake disaster.

[0009] S4. To test the effectiveness of coordinated prevention and control of combined rockburst and mine earthquake disasters.

[0010] This invention achieves coordinated prevention and control of combined disasters caused by rockbursts and mine tremors induced by thick roofs by simultaneously identifying and coordinating the control of the main control layers of rockbursts and mine tremors. This provides a clearer theoretical basis for the management of combined disasters in areas where mine tremors and rockbursts occur, thereby reducing the waste of resources and low management effectiveness caused by blindness in the management of combined disasters.

[0011] Optionally, in S1, when determining the main control layer of disaster, the microseismic events detected within a certain period of time are statistically analyzed in conjunction with the underground and surface microseismic monitoring system. The microseismic events occurring within this period of time are divided into different orders of magnitude and statistically analyzed using a combination of box plots and event scatter normal distribution plots to determine the main control layer of impact disaster and the main control layer of mine tremor disaster.

[0012] Furthermore, the box plot uses the vertical height of the coal seam as the 0-degree scale;

[0013] The median value of the vertical distribution determined by the box plot is taken as the central vertical height of the main control layer of the impact disaster.

[0014] The vertical distribution heights corresponding to the upper and lower quartiles of the box plot are used as the stratigraphic range of the main control layer for impact-induced disasters.

[0015] Furthermore, when a mine earthquake occurs, the energy detected by the microseismic system is on the order of magnitude higher, and the distance between the main control layer of the mine earthquake disaster and the coal seam is greater than the distance between the main control layer of the impact disaster and the coal seam. The layer in which the mine earthquake occurred within the statistical time period is the main control layer of the mine earthquake disaster, and the vertical distribution range of the mine earthquake occurrence within the statistical time period is the layer range of the main control layer of the mine earthquake disaster.

[0016] Furthermore, during the test of the surface F-type well fracturing prevention and control scheme, a test site was selected on-site. Based on the multi-hazard-causing layer collaborative treatment scheme, a collaborative treatment test was conducted on the thick roof of the test site area for the main control layer of impact-causing disaster and the main control layer of mine earthquake-causing disaster. Microseismic monitoring was carried out again. Based on the detection results, a test comparison model was established. The test comparison model and the main control model of disaster were analyzed and compared using a combination of box plots and event scatter normal distribution plots. Based on the analysis and comparison results, the multi-hazard-causing layer collaborative treatment scheme was revised.

[0017] Furthermore, the optional schemes for surface F-type well fracturing prevention and control include: surface F-type well fracturing method with two disaster-causing layers, surface F-type well fracturing method with localized mine earthquake-causing layers, and surface F-type well fracturing method with a single super-thick disaster-causing layer.

[0018] When revising the fracturing prevention and control plan for F-type wells on the ground based on the test results, this includes reselecting the plan.

[0019] Furthermore, the application scenarios of the F-type well fracturing method for dual disaster-causing layers include: when the coal seam mining face is simultaneously overlain by both rockburst-controlled disaster-causing layers and mine seismic-controlled disaster-causing layers, and the horizontal extension range of the two rock layers is similar.

[0020] Furthermore, the application scenarios of the surface F-type well fracturing method for localized seismic disaster-causing layers include: coal seam mining faces with both rockburst-controlled disaster-causing layers and seismic-controlled disaster-causing layers. However, the thickness and occurrence of the seismic-controlled disaster-causing rock layers vary drastically, and the horizontal extension range is small, but it also exhibits the characteristics of localized thick double disaster-causing layers. At the same time, the horizontal fracturing sections of the upper and lower layers treat different areas and produce vertical displacement.

[0021] Furthermore, the application scenarios for the surface F-type well fracturing method for a single, extremely thick disaster-causing layer include: when the coal seam mining face is overlain by an extremely thick critical layer, that is, the thickness of a single rock layer exceeds 80m and the extension range is large.

[0022] Furthermore, in S3, after carrying out corresponding fracturing or blasting operations according to the preliminary surface F-type well fracturing prevention and control plan, high-strength energy-absorbing support equipment is arranged in the roadway to provide stable support for the surrounding rock and maintain the integrity of the roadway.

[0023] Furthermore, in S4, the effectiveness of rockburst control and mine tremor control is tested using rockburst control effectiveness testing technology and mine tremor control effectiveness testing technology to test the synergistic control effect of rockburst and mine tremor combined disasters.

[0024] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0026] Figure 1 This is a schematic diagram of the method steps for preventing combined rockburst and mine earthquake disasters by fracturing a surface F-type well according to the present invention;

[0027] Figure 2 This is a schematic diagram illustrating the technical breakdown of a method for preventing combined rockburst and mine earthquake disasters using surface F-type well fracturing according to the present invention.

[0028] Figure 3 This is a schematic diagram of the key layer analysis of a method for preventing combined rockburst and mine tremor disasters by fracturing a surface F-type well according to the present invention, which aims to show the definite location of the main disaster-causing layer in multiple key layers;

[0029] Figure 4 This is a box plot and a normal distribution diagram of event scatter points, which are combined to illustrate the distribution of microseismic events before and after treatment, according to a method for preventing combined rockburst and mine seismic disasters by fracturing a ground-type F-well according to the present invention.

[0030] Figure 5 This is a schematic diagram of an embodiment of a method for coordinated prevention and control of combined disasters of thick roof-induced rockburst and mine seismic hazard according to the present invention, which aims to demonstrate the horizontal well arrangement of the surface F-type well fracturing method for dual disaster-causing layers;

[0031] Figure 6 This is a schematic diagram of an embodiment of a method for coordinated prevention and control of combined disasters of thick roof-induced rockburst and mine seismic hazard according to the present invention, which aims to demonstrate the horizontal well arrangement of the surface F-type well fracturing method for local mine seismic disaster-causing layers.

[0032] Figure 7 This is a schematic diagram of an embodiment of a method for coordinated prevention and control of combined disasters of rockburst and mine tremor induced by a thick roof according to the present invention, which aims to demonstrate the horizontal well layout of the surface F-type well fracturing method for a single super-thick disaster-causing layer. Detailed Implementation

[0033] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0034] This invention provides a method for preventing combined rockburst and mine earthquake disasters by fracturing F-type wells on the surface, as described below. Figures 1 to 7 Please provide a detailed explanation.

[0035] A method for preventing combined rockburst and mine tremor disasters by fracturing F-type wells on the ground includes the following steps:

[0036] S1. Based on the key layer theory, multiple key layers of the thick roof are determined, and a disaster-causing main control layer model is established using a microseismic monitoring system both above and below ground. The location of the main control layer for impact disaster and the location of the main control layer for mine earthquake disaster are determined by combining the key layer and the disaster-causing main control layer model.

[0037] S2. Based on the location, thickness, and strata information of the main control layers for impact disasters and mine earthquake disasters, a surface F-type well fracturing prevention and control scheme is established to coordinate the treatment of the main control layers for impact disasters and mine earthquake disasters. The surface F-type well fracturing prevention and control scheme is tested on-site, and the scheme is revised based on the test results.

[0038] S3. Based on the revised surface F-type well fracturing prevention and control plan and the disaster-causing main control layer model, carry out coordinated fracturing prevention and control operations on the thick roof with the location of the main control layer for impact disaster or the main control layer for mine earthquake disaster.

[0039] S4. To test the effectiveness of coordinated prevention and control of combined rockburst and mine earthquake disasters.

[0040] This invention achieves coordinated prevention and control of combined disasters caused by rockbursts and mine tremors induced by thick roofs by simultaneously identifying and coordinating the control of the main control layers of rockbursts and mine tremors. This provides a clearer theoretical basis for the management of combined disasters in areas where mine tremors and rockbursts occur, thereby reducing the waste of resources and low management effectiveness caused by blindness in the management of combined disasters.

[0041] In some embodiments, in S1, when determining the main control layer of disaster, the microseismic events detected within a certain period of time are statistically analyzed in conjunction with the underground and surface microseismic monitoring system. The microseismic events occurring within this period of time are divided into different orders of magnitude and statistically analyzed. The impacts of different orders of magnitude are statistically analyzed by combining box plots and event scatter normal distribution plots, so as to collaboratively determine the main control layer of impact disaster and the main control layer of mine tremor disaster.

[0042] In some embodiments, such as Figure 4 The box plot and the normal distribution of the event scatter plot are shown on the left. The box plot is set with the vertical height of the coal seam as 0.

[0043] The median value of the vertical distribution determined by the box plot is taken as the central vertical height of the main control layer of the impact disaster.

[0044] The vertical distribution heights corresponding to the upper and lower quartiles of the box plot are used as the stratigraphic range of the main control layer for impact-induced disasters.

[0045] Specifically, when classifying microseismic events into different orders of magnitude, real-time microseismic monitoring of the thick roof is required before a mine-induced seismic shutdown. The monitored vibration energy is used as the classification standard, in J, with different powers of 10 representing different order of magnitudes. Statistics are then compiled for each detected vibration energy level. 4 Microseismic events of J magnitude or higher.

[0046] Furthermore, since the energy level of the strata that generate mine tremors is significantly higher than that detected by the main control layer of shock-induced disasters, the microseismic events corresponding to mine tremors are significantly higher than the range corresponding to the upper quartile in the box plot. The vertical distribution range corresponding to mine tremor events that are significantly higher than the upper quartile is statistically analyzed and used as the range of the main control layer of mine tremor-induced disasters.

[0047] In one embodiment, to further determine the horizontal wellbore axis layout range of the main control layer for shock-induced ground pressure during fracturing, a high-level fracturing test can be conducted in the area generating shock pressure. Then, microseismic monitoring is performed again in this area, and box plots and event scatter normal distribution plots are used to statistically analyze shocks of different orders of magnitude, resulting in a box plot of microseismic events after high-level fracturing, such as... Figure 4 The intermediate box plot and the event scatter normal distribution plot are shown. The median value in the box plot is the first value, and the median value in the box plot corresponding to the microseismic event measured before the shutdown is the second value. A vertical distribution range with the first value and the second value as the endpoints is formed. This range is used as the layout range of the horizontal well axis of the main control layer of the impact disaster.

[0048] Furthermore, after the overall treatment is completed, microseismic events detected by the surface and underground microseismic monitoring systems can be collected again, and statistical analysis of impacts of different orders of magnitude can be performed using a combination of box plots and scatter plots of events. Figure 4 As shown in the box plot and the normal distribution plot of the event scatter points on the right, the vertical distribution range and frequency of microseismic events after treatment can be statistically observed. A decrease in the distribution range and frequency of occurrence indicates that the treatment has a significant effect.

[0049] In some embodiments, when a mine earthquake occurs, the energy detected by the microseismic system is on the order of magnitude higher, and the distance between the mine earthquake-causing stratum and the coal seam is greater than the distance between the impact-causing stratum and the coal seam. The stratum in which the mine earthquake occurred within the statistical time period is the mine earthquake-causing stratum, and the vertical distribution range of the mine earthquakes within the statistical time period is the stratum range of the mine earthquake-causing stratum.

[0050] In some embodiments, during S2, when conducting a multi-hazard-causing layer collaborative governance scheme test, a test site is selected on-site. Based on the multi-hazard-causing layer collaborative governance scheme, a collaborative governance test of the main control layer for impact-causing disasters and the main control layer for mine earthquake-causing disasters is conducted on the thick roof of the test site. Microseismic monitoring is then conducted again. Based on the detection results, a test comparison model is established. The test comparison model and the main control model for disasters are analyzed and compared using a combination of box plots and event scatter normal distribution plots. Based on the analysis and comparison results, the multi-hazard-causing layer collaborative governance scheme is revised.

[0051] In some embodiments, the optional schemes for the surface F-type well fracturing prevention and control scheme include: the surface F-type well fracturing method with two disaster-causing layers, the surface F-type well fracturing method with local mine earthquake disaster-causing layers, and the surface F-type well fracturing method with a single super-thick disaster-causing layer. When selecting the surface F-type well fracturing prevention and control scheme, at least one of the above three methods is selected for the coordinated treatment of the mine earthquake disaster-causing main control layer and the impact disaster-causing main control layer.

[0052] The fracturing prevention and control scheme for F-type wells on the surface needs to simultaneously consider the location, thickness, and rock structure factors of the main control layer for shock-induced disasters and the main control layer for mine-induced disasters, in order to determine the collaborative construction method to simultaneously treat the main control layers for shock-induced disasters and the main control layers for mine-induced disasters.

[0053] When revising the fracturing prevention and control plan for F-type wells on the ground based on the test results, this includes reselecting the plan.

[0054] Generally, the distance between the main control layer of mine earthquake disaster and the coal seam is relatively large. However, in some cases, the distance between the main control layer of mine earthquake disaster and the coal seam and the distance between the main control layer of impact disaster and the coal seam are similar. Therefore, the main control layer of mine earthquake disaster includes the upper mine earthquake layer and the lower mine earthquake layer. The distance between the upper mine earthquake layer and the coal seam is greater than the distance between the lower mine earthquake layer and the coal seam. The lower mine earthquake layer and the main control layer of impact disaster are similar in vertical distribution height.

[0055] When surface fracturing is carried out on the upper seismic layer, the well axis of the horizontal well is located at the center of the upper seismic layer. At the same time, the horizontal well of the impact-causing layer is located at the center of the impact-causing main control layer. At least one of the above three surface F-type well fracturing prevention and control schemes is used to coordinate the treatment of the seismic-causing main control layer and the impact-causing main control layer.

[0056] When performing surface fracturing to treat the lower seismic layer, the range of the main control layer for impact disasters should be considered simultaneously. The range of the fracturing layer and the position of the horizontal well axis should be comprehensively determined to determine whether both the horizontal wells of the seismic and impact disaster control layers can be arranged. If they can be arranged, at least one of the three surface F-type well fracturing prevention and control schemes mentioned above should still be used to achieve coordinated treatment of the main control layers for impact and seismic disasters. If the lower seismic layer and the main control layer for impact disasters are too close, the two horizontal wells should be merged into one horizontal well to achieve coordinated treatment of the lower seismic layer and the main control layer for impact disasters.

[0057] In some embodiments, the application scenarios of the F-type well fracturing method with dual disaster-causing layers include: the coal seam mining face is simultaneously overlain by a disaster-causing layer dominated by rockburst and a disaster-causing layer dominated by mine seismic activity, and the horizontal extension range of the two rock layers is similar.

[0058] The specific method of fracturing F-type wells with dual disaster-causing layers includes: simultaneously treating the main control layer of mine tremor-induced disaster and the main control layer of impact-induced disaster using surface fracturing methods, and designating the fracturing layers as the first fracturing layer and the second fracturing layer according to the main control layer of impact-induced disaster and the main control layer of mine tremor-induced disaster, respectively.

[0059] When constructing horizontal wells, the vertical sections of the horizontal wells of the first and second fracturing layers are shared, forming an inverted F-shaped horizontal well layout. This reduces the construction steps and the input of manpower and materials, while also enabling simultaneous well construction and fracturing operations for the main control layers of impact-induced disasters and mine seismic disasters.

[0060] In some embodiments, the application scenarios of the surface F-type well fracturing method for localized seismic disaster-causing layers include: the coal seam mining face is simultaneously overlaid with both rockburst-controlled disaster-causing layers and seismic disaster-causing layers. However, the thickness and occurrence of the seismic disaster-causing rock strata vary drastically, and the horizontal extension range is small, but it also exhibits the characteristics of localized thick double disaster-causing layers. At the same time, the horizontal fracturing sections of the upper and lower strata treat different areas and produce vertical displacement.

[0061] The surface F-type well fracturing method for localized mine earthquake-induced disaster layers specifically includes: using surface fracturing methods to simultaneously treat the mine earthquake-induced disaster control layer and the impact-induced disaster control layer, and designating the fracturing layers as the first fracturing layer and the second fracturing layer according to the impact-induced disaster control layer and the mine earthquake-induced disaster control layer, respectively.

[0062] When constructing horizontal wells, because the area of ​​the main control layer for mine earthquake disasters is relatively small, in order to simultaneously treat the main control layer for mine earthquake disasters, while the normal well construction operation is carried out on the second fracturing layer (the main control layer for impact disasters), the horizontal well parallel to the second fracturing layer is used to construct the first fracturing layer (the main control layer for mine earthquake disasters). The two horizontal wells form a deformed inverted F-shaped arrangement and carry out synchronous or asynchronous fracturing operations.

[0063] In some embodiments, the application scenarios of the surface F-type well fracturing method for a single thick disaster-causing layer include: when a thick critical layer is overlying the coal seam mining face, that is, the thickness of a single rock layer exceeds 80m and the extension range is large.

[0064] The surface F-type well fracturing method for a single super-thick disaster-causing layer specifically includes: arranging various horizontal wells in a single super-thick disaster-causing layer, with two horizontal wells sharing the same vertical section to form an inverted F-type horizontal well arrangement. This reduces the construction steps during the horizontal well arrangement, reduces the input of manpower and material resources, and can stably ensure the fracturing effect on a single super-thick disaster-causing layer.

[0065] In some embodiments, in S3, after carrying out corresponding fracturing or blasting operations according to the preliminary disaster-causing layer treatment plan, high-strength energy-absorbing support equipment is arranged in the roadway to provide stable support for the surrounding rock and maintain the integrity of the roadway.

[0066] The support strength and energy absorption capacity of roadway supports are key to preventing roadway rockbursts. That is, the supports must provide high support strength under normal support conditions, and quickly give way to absorb energy when there is a sudden rockburst. During the giving way process, the supports must always maintain a stable support force on the surrounding rock to maintain the integrity of the roadway.

[0067] When using roadway anti-rockburst energy absorption support for rockburst prevention, not only must the energy absorption support equipment meet the rockburst prevention requirements, but the synergistic effect between the energy absorption support and the surrounding rock is also crucial. This determines the energy absorption effect of the energy absorption support and the surrounding rock, as well as the stress field regulation effect, thereby improving the rockburst prevention and resistance to mine tremors.

[0068] In some embodiments, S4, the effectiveness of rockburst control and mine tremor control is verified using rockburst control effect verification technology and mine tremor control effect verification technology. Underground and surface microseismic monitoring systems, coal stress, and multi-point displacement monitoring equipment are used to monitor the mining process at the working face, analyzing the collapse of thick roofs, energy release, and stress evolution processes.

[0069] Sensitive indicators for assessing thick roof treatment are proposed to evaluate the disaster-causing properties and the effectiveness of engineering measures after thick roof treatment. The indicators include: the intensity of energy release during thick roof failure, the energy level and frequency of high-energy microseismic events, the clustering effect of microseismic events, the failure energy of high-level roof, the range of influence of working face support pressure, the periodic pressure step distance, and the surface subsidence rate.

[0070] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0071] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0072] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0073] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0074] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0075] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for preventing combined rockburst and mine-induced seismic disasters by fracturing F-type wells on the surface, characterized in that, Includes the following steps: S1. Based on the critical layer theory, multiple critical layers of the thick roof are determined, and a disaster-causing main control layer model is established using a microseismic monitoring system both above and below ground. Combining the critical layer and disaster-causing main control layer models, the locations of the main control layers for impact-induced disasters and mine-induced earthquake-induced disasters are determined. When determining the disaster-causing main control layers, the microseismic events detected within a certain time period are statistically analyzed using the above and below ground microseismic monitoring system. These microseismic events within that time period are then divided into different orders of magnitude, and a combination of box plots and event scatter normal distribution plots is used to statistically analyze impacts of different orders of magnitude, in order to collaboratively determine the main control layers for impact-induced disasters and mine-induced earthquake-induced disasters. The box plot uses the vertical height of the coal seam as the 0-degree scale. The median value of the vertical distribution determined by the box plot is taken as the central vertical height of the main control layer of the impact disaster. The vertical distribution heights corresponding to the upper and lower quartiles of the box plot are used as the stratigraphic range of the main control layer for impact-induced disasters. S2. Based on the location, thickness, and strata information of the main control layers for impact disasters and mine earthquake disasters, a surface F-type well fracturing prevention and control scheme is established to coordinate the treatment of the main control layers for impact disasters and mine earthquake disasters. The surface F-type well fracturing prevention and control scheme is tested on-site, and the scheme is revised based on the test results. S3. Based on the revised surface F-type well fracturing prevention and control plan and the disaster-causing main control layer model, carry out coordinated fracturing prevention and control operations on the thick roof with the location of the main control layer for impact disaster or the main control layer for mine earthquake disaster. S4. To test the effectiveness of coordinated prevention and control of combined rockburst and mine earthquake disasters.

2. The method for preventing combined rockburst and mine-induced seismic disasters by fracturing a surface F-type well as described in claim 1, characterized in that, When a mine earthquake occurs, the energy detected by the microseismic system is on the order of magnitude higher, and the distance between the main control layer of the mine earthquake disaster and the coal seam is greater than the distance between the main control layer of the impact disaster and the coal seam. The layer in which the mine earthquake occurred within the statistical time period is the main control layer of the mine earthquake disaster, and the vertical distribution range of the mine earthquake occurrence within the statistical time period is the layer range of the main control layer of the mine earthquake disaster.

3. The method for preventing combined rockburst and mine-induced seismic disasters by fracturing a surface F-type well as described in claim 1, characterized in that, In S2, when conducting tests on the collaborative governance scheme for multiple disaster-causing layers, a test site was selected on-site. Based on the collaborative governance scheme for multiple disaster-causing layers, collaborative governance tests were conducted on the thick roof of the test site for the main control layers of impact disasters and mine earthquake disasters. Microseismic monitoring was carried out again. Based on the detection results, a test comparison model was established. The test comparison model and the main control model of disasters were analyzed and compared using a combination of box plots and event scatter normal distribution plots. Based on the analysis and comparison results, the collaborative governance scheme for multiple disaster-causing layers was revised.

4. The method for preventing combined rockburst and mine-induced seismic disasters by fracturing a surface F-type well as described in claim 3, characterized in that, The available options for surface F-type well fracturing prevention and control include: surface F-type well fracturing method with two disaster-causing layers, surface F-type well fracturing method with localized mine earthquake-causing layers, and surface F-type well fracturing method with a single super-thick disaster-causing layer; When revising the fracturing prevention and control plan for F-type wells on the ground based on the test results, this includes reselecting the plan.

5. The method for preventing combined rockburst and mine-induced seismic disasters by fracturing a surface F-type well as described in claim 4, characterized in that, Application scenarios for the F-type well fracturing method with dual disaster-causing layers include: when the coal seam mining face is simultaneously overlain by a disaster-causing layer dominated by rockburst and a disaster-causing layer dominated by mine seismic activity, and the horizontal extension range of the two rock layers is similar.

6. The method for preventing combined rockburst and mine-induced seismic disasters by fracturing a surface F-type well as described in claim 4, characterized in that, The application scenarios of the surface F-type well fracturing method for localized mine-induced disaster layers include: coal seam mining face with both rockburst-controlled disaster-inducing strata and mine-induced disaster-inducing strata. However, the thickness and occurrence of the mine-induced disaster-inducing rock strata vary drastically, and the horizontal extension range is small, but it also shows the characteristics of local thick double disaster-inducing strata. At the same time, the horizontal fracturing sections of the upper and lower strata treat different areas and produce vertical displacement.

7. The method for preventing combined rockburst and mine earthquake disasters by fracturing a surface F-type well as described in claim 4, characterized in that, Application scenarios for the surface F-type well fracturing method for a single, extremely thick disaster-causing layer include: when the coal seam mining face is overlain by an extremely thick critical layer, that is, the thickness of a single rock layer exceeds 80m and the extension range is large.

8. The method for preventing combined rockburst and mine-induced seismic disasters by fracturing a surface F-type well as described in claim 1, characterized in that, In S3, after carrying out corresponding fracturing or blasting operations according to the preliminary surface F-type well fracturing prevention and control plan, high-strength energy-absorbing support equipment is arranged in the roadway to provide stable support for the surrounding rock and maintain the integrity of the roadway.

9. The method for preventing combined rockburst and mine-induced seismic disasters by fracturing a surface F-type well as described in claim 1, characterized in that, In S4, the effectiveness of rockburst control and mine tremor control is tested using rockburst control effect testing technology and mine tremor control effect testing technology to test the synergistic control effect of rockburst and mine tremor combined disasters.

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