Rock stratum displacement monitoring method, device and system based on multi-point displacement meter

Abstract

The invention relates to a rock stratum displacement monitoring method, device and system based on a multipoint displacement meter. The method comprises the following steps: obtaining preset measuring point distribution data by responding to fracturing operation, which is completed by utilizing a ground fracturing well, on a target weakening area corresponding to a goaf; based on the measuring point distribution information, drilling equipment is controlled to drill holes in the casing pipe, and a plurality of drill holes matched with the measuring point distribution information are obtained; each sensor node in the plurality of sensor nodes is connected with the signal receiver; aiming at each sensor node, mounting the sensor node into the corresponding drill hole; and acquiring monitoring data sent by each sensor node in real time by using the signal receiver, and determining the displacement monitoring information of the rock stratum based on the monitoring data. According to the scheme, the comprehensiveness and accuracy of rock stratum displacement monitoring are improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of coal mining, and in particular to a rock formation displacement monitoring method, device and system based on a multi-point displacement meter. Background Art

[0002] In the related art, ground regional fracturing technology is widely used in the weakening treatment of hard roof in the process of coal mining, that is, setting up a ground fracturing well including a vertical section, an inclined section and a horizontal section, injecting fracturing fluid into the horizontal section of the ground fracturing well, and then using the fracturing fluid in the horizontal section to perform fracturing operations to achieve the weakening treatment of the hard roof. However, after the fracturing operation is completed, the vertical section and the inclined section are idle, and the utilization rate is low, resulting in a waste of resources. In addition, the traditional rock formation monitoring method is to monitor the activity of the roof rock formation by arranging control points horizontally on the working face. This method is difficult to judge the activity of the roof rock formation based on the settlement of the entire rock formation, and the monitoring accuracy is low. Summary of the Invention

[0003] In order to overcome the problems existing in the related art, the present disclosure provides a rock formation displacement monitoring method, device and system based on a multi-point displacement meter.

[0004] According to a first aspect of an embodiment of the present disclosure, a method for monitoring rock formation displacement based on a multi-point displacement meter is provided, comprising:

[0005] In response to completing a fracturing operation on a target weakened area corresponding to a goaf using a surface fracturing well, obtaining preset measurement point distribution data; the measurement point distribution data is determined based on rock formation information corresponding to the surface fracturing well; the surface fracturing well is provided with a casing;

[0006] Based on the measurement point distribution information, a drilling device is controlled to drill the casing to obtain a plurality of boreholes matching the measurement point distribution information; wherein the distributed displacement sensor includes a plurality of sensor nodes; the plurality of sensor nodes correspond one-to-one to the plurality of boreholes; and each of the plurality of sensor nodes is connected to a signal receiver;

[0007] For each sensor node, installing the sensor node into the corresponding drill hole;

[0008] The signal receiver is used to acquire the monitoring data sent by each sensor node in real time, and the displacement monitoring information of the rock formation is determined based on the monitoring data.

[0009] In some embodiments of the present disclosure, before obtaining preset measurement point distribution data in response to completing a fracturing operation on a target weakened area corresponding to a goaf using a surface fracturing well, the method further includes:

[0010] Obtaining rock formation information corresponding to the surface fracturing well; the rock formation information includes rock formation heights of multiple rock formations corresponding to the depths of the surface fracturing well; the rock formation heights are heights of rock formations adjacent to the surface fracturing well;

[0011] selecting a plurality of target rock layers from the plurality of rock layers based on the rock layer distribution information; the plurality of target rock layers are determined based on key layers among the plurality of rock layers;

[0012] For each target rock formation, determining a first depth position corresponding to a position adjacent to the surface fracturing well of the target rock formation as an initial measuring point depth;

[0013] The measuring point distribution data is determined based on the initial measuring point depth corresponding to each target rock formation.

[0014] In some embodiments of the present disclosure, the surface fracturing well includes a vertical section, a deflection section, and a horizontal section; and based on the measurement point distribution information, controlling the drilling equipment to drill the casing to obtain a plurality of boreholes matching the measurement point distribution information includes:

[0015] Based on the measurement point distribution information, controlling the drilling equipment to drill the casing in the vertical section to obtain a plurality of boreholes matching the measurement point distribution information;

[0016] The method of using the signal receiver to acquire the monitoring data sent by each sensor node in real time and determining the displacement monitoring information of the rock formation based on the monitoring data includes:

[0017] Obtaining an initial measurement point depth of each sensor node; the initial measurement point depth is the distance between the sensor node and the ground surface;

[0018] For each sensor node, a height change value sent by the sensor node is acquired, and the sum of the height change value and the initial measurement point depth of the sensor node is determined as displacement monitoring information corresponding to the sensor node.

[0019] In some embodiments of the present disclosure, the surface fracturing well comprises a vertical section, a deflection section, and a horizontal section;

[0020] The step of controlling a drilling device to drill the casing based on the measuring point distribution information to obtain a plurality of boreholes matching the measuring point distribution information includes:

[0021] Based on the measurement point distribution information, controlling the drilling equipment to drill the casing in the vertical section and the deflection section to obtain a plurality of boreholes matching the measurement point distribution information;

[0022] The method of using the signal receiver to acquire the monitoring data sent by each sensor node in real time and determining the displacement monitoring information of the rock formation based on the monitoring data includes:

[0023] For each sensor node located in the vertical segment, obtaining a height change value sent by the sensor node, and determining the sum of the height change value and the initial measurement point depth of the sensor node as displacement monitoring information corresponding to the sensor node;

[0024] For each sensor node located in the build section, the height change value sent by the sensor node is obtained, and the displacement monitoring information corresponding to the sensor node is calculated using the following formula:

[0025] H=H1+h·sinα

[0026] Wherein, H is the depth of the sensor node after displacement, H1 is the initial measurement point depth of the sensor node, h is the height change value, and α is the angle between the tangent line of the monitoring point where the sensor node is located and the deflection section and the horizontal plane;

[0027] The depth of the sensor node after displacement is determined as the displacement monitoring information of the sensor node.

[0028] In some embodiments of the present disclosure, the plurality of sensor nodes are connected in parallel via lines.

[0029] In some embodiments of the present disclosure, after installing each sensor node into a corresponding borehole, the method further includes:

[0030] The line is fixedly connected to the sensor fixing piece by using a wellhead wiring device, and the sensor fixing piece is installed at the wellhead position of the surface fracturing well.

[0031] According to a second aspect of an embodiment of the present disclosure, a rock formation displacement monitoring device based on a multi-point displacement meter is provided, comprising:

[0032] an acquisition unit, configured to acquire preset measurement point distribution data in response to completing a fracturing operation on a target weakened area corresponding to a goaf using a surface fracturing well; the measurement point distribution data is determined based on rock formation information corresponding to the surface fracturing well; the surface fracturing well is provided with a casing;

[0033] a drilling unit, configured to control a drilling device to drill the casing based on the measuring point distribution information, thereby obtaining a plurality of boreholes matching the measuring point distribution information; wherein the distributed displacement sensor includes a plurality of sensor nodes; the plurality of sensor nodes correspond one-to-one to the plurality of boreholes; and each of the plurality of sensor nodes is connected to a signal receiver;

[0034] An installation unit, configured to install each sensor node into a corresponding drill hole;

[0035] The determining unit is configured to use the signal receiver to acquire the monitoring data sent by each sensor node in real time, and determine the displacement monitoring information of the rock formation based on the monitoring data.

[0036] According to a third aspect of an embodiment of the present disclosure, an electronic device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method described in any one of the first aspects is implemented.

[0037] According to a fourth aspect of an embodiment of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the method according to any one of the first aspects is implemented.

[0038] According to a fifth aspect of an embodiment of the present disclosure, a computer program product is provided, comprising a computer program, wherein the computer program implements the method as described in any one of the first aspects when executed by a processor.

[0039] The technical solution provided by the embodiments of the present disclosure may have the following beneficial effects: in response to a fracturing operation being completed on a target weakened area corresponding to a goaf using a surface fracturing well, preset measurement point distribution data is obtained; the measurement point distribution data is determined based on rock formation information corresponding to the surface fracturing well; a casing is provided inside the surface fracturing well; based on the measurement point distribution information, a drilling device is controlled to drill the casing to obtain a plurality of boreholes matching the measurement point distribution information; wherein the distributed displacement sensor includes a plurality of sensor nodes; the plurality of sensor nodes correspond one-to-one to a plurality of boreholes; each of the plurality of sensor nodes is connected to a signal receiver; for each sensor node, the sensor node is installed in the corresponding borehole; the signal receiver obtains monitoring data sent by each sensor node in real time, and determines rock formation displacement monitoring information based on the monitoring data. Thus, the surface fracturing well is used as a monitoring well for rock formation displacement, and the distributed displacement sensor is used to comprehensively monitor the displacement information of the plurality of rock formations corresponding to the surface fracturing well, thereby improving the utilization rate of the surface fracturing well and the comprehensiveness and accuracy of rock formation displacement monitoring.

[0040] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0042] Figure 1 The present invention is a flowchart showing a method for monitoring rock formation displacement based on a multi-point displacement meter according to an exemplary embodiment.

[0043] Figure 2 This is a schematic diagram of ground horizontal well fracturing before working face recovery proposed in an embodiment of the present application.

[0044] Figure 3 This is a schematic diagram of ground horizontal well fracturing after working face recovery proposed in an embodiment of the present application.

[0045] Figure 4 This is a schematic diagram of roof rock movement monitoring proposed in an embodiment of the present application.

[0046] Figure 5 This is a schematic diagram of the installation position of the distributed displacement sensor proposed in the embodiment of the present application.

[0047] Figure 6 This is a schematic diagram of the structure of the sensor fixing member proposed in an embodiment of the present application.

[0048] Figure 7 The block diagram of a rock formation displacement monitoring device based on a multi-point displacement meter is shown according to an exemplary embodiment.

[0049] Figure 8 It is a block diagram of an apparatus for a rock formation displacement monitoring method based on a multi-point displacement meter according to an exemplary embodiment.

[0050] Reference numerals

[0051] 1-distributed displacement sensor; 11-sensor node; 2-sensor fixture; 3-rock formation; 5-signal receiver; 6-ground fracturing well. DETAILED DESCRIPTION

[0052] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, like numbers in different figures represent like or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present invention, as detailed in the appended claims.

[0053] The terms used in the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The singular forms "a", "an" and "the" used in the present disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0054] It should be understood that although the terms first, second, third, etc. may be used to describe various information in the embodiments of the present disclosure, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of the embodiments of the present disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the words "if" and "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0055] Furthermore, the various forms of processes shown in the embodiments of this disclosure may be used to reorder, add, or delete steps. For example, the steps described in this application may be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions disclosed in this disclosure can be achieved. This is not a limitation herein.

[0056] It should be noted that traditional surface horizontal well fracturing technology can include the following processes:

[0057] Drilling technology: Figure 2 As shown, a combination of technologies such as logging while drilling and comprehensive mud logging is used to control the drilling trajectory. Casings of different diameters are lowered above the coal seam to a certain depth, and cement is filled in the annular space between the casing and the wellbore to form a solid fracturing wellbore, isolating oil, gas, water and other broken formations.

[0058] Fracturing process: Figure 3 As shown in the figure, a perforator is used to penetrate the casing and cement sheath, connecting the fractured rock formation with the wellbore, providing a smooth channel for the pressure pump to press the fracturing fluid into the formation through the wellhead assembly. After perforating, the fracturing tool string is sent to the horizontal section at the bottom of the well, and the packer is activated and set. Through large-scale fracturing operations, the target rock formation is cut to the maximum extent, creating a complex fracture network.

[0059] Construction Equipment: Optimize the wellhead and blowout preventer based on the selected staged fracturing process, construction pressure, fracturing construction parameters, and casing conditions. Strength verification requires that the rated operating pressure be no less than 1.25 times the pressure limit, ultimately determining the equipment model and technical parameters. Based on the optimized design construction parameters and pressure limit, calculate the water horsepower required for fracturing construction. The water injection horsepower of the fracturing pump should be no less than 1.2 times the design water horsepower. Determine the model and quantity of the fracturing construction pump trucks, the model and technical parameters of the sand mixer trucks, and the model, quantity, and technical parameters of other auxiliary equipment.

[0060] In related technologies, after the mining of the mine working face, understanding the movement law of the roof rock strata is more beneficial for the prevention and control of rock burst. However, there are currently limited means of observing the movement of the roof rock strata. For example, surface settlement observation monitors the activity of the roof rock strata by arranging control points horizontally on the working face. This method is difficult to judge the activity of the roof rock strata based on the settlement of the entire rock strata, and the monitoring accuracy is low.

[0061] To address the above-mentioned problems, the present disclosure provides a method, device, and system for monitoring rock formation movement based on a ground-fracturing horizontal well. After the ground-fracturing well is used to complete the fracturing operation on the target weakened area corresponding to the goaf, the paving equipment is controlled to lay the fiber optic sensor in a U-shape to the corresponding position of the ground-fracturing well; the fiber optic sensor is arranged to fit the well wall of the ground-fracturing well; the grouting equipment is controlled to inject concrete slurry into the ground-fracturing well so that the fiber optic sensor inside the ground-fracturing well can directly conduct force between the fiber optic sensor and the rock formation in which it is located; a signal transceiver is used to send an input detection signal to the fiber optic sensor, and a signal transceiver is used to receive an output detection signal transmitted back by the fiber optic sensor; based on the output detection signal, the fiber Brillouin frequency drift at each position on the fiber optic sensor is determined, and the rock formation movement monitoring result corresponding to the goaf is determined based on the fiber Brillouin frequency drift. Thus, the ground-fracturing well is fully utilized based on the fiber optic sensor, and more comprehensive movement monitoring of the rock formation above the goaf is achieved, thereby improving the comprehensiveness of the monitoring range and thereby improving the accuracy of rock formation activity monitoring.

[0062] In the related art, ground regional fracturing technology is widely used in the weakening treatment of hard roof in the process of coal mining, that is, setting up a ground fracturing well including a vertical section, an inclined section and a horizontal section, injecting fracturing fluid into the horizontal section of the ground fracturing well, and then using the fracturing fluid in the horizontal section to perform fracturing operations to achieve the weakening treatment of the hard roof. However, after the fracturing operation is completed, the vertical section and the inclined section are idle, and the utilization rate is low, resulting in a waste of resources. In addition, the traditional rock formation monitoring method is to monitor the activity of the roof rock formation by arranging control points horizontally on the working face. This method is difficult to judge the activity of the roof rock formation based on the settlement of the entire rock formation, and the monitoring accuracy is low.

[0063] To address the above-mentioned problems, the present disclosure provides a method, device, and system for monitoring rock formation displacement based on a multi-point displacement meter. The method, device, and system obtain preset measurement point distribution data in response to a fracturing operation completed on a target weakened area corresponding to a goaf using a surface fracturing well. The measurement point distribution data is determined based on rock formation information corresponding to the surface fracturing well. The surface fracturing well is provided with a casing. Based on the measurement point distribution information, a drilling device is controlled to drill the casing to obtain multiple boreholes matching the measurement point distribution information. The distributed displacement sensor includes multiple sensor nodes, each of which corresponds to a plurality of boreholes. Each of the multiple sensor nodes is connected to a signal receiver. For each sensor node, the sensor node is installed in the corresponding borehole. The signal receiver obtains the monitoring data sent by each sensor node in real time, and determines rock formation displacement monitoring information based on the monitoring data. Thus, the surface fracturing well is used as a monitoring well for rock formation displacement. The distributed displacement sensor is used to comprehensively monitor the displacement information of multiple rock formations corresponding to the surface fracturing well, thereby improving the utilization rate of the surface fracturing well and the comprehensiveness and accuracy of rock formation displacement monitoring.

[0064] Figure 1 FIG. 1 is a flow chart showing a method for monitoring rock displacement based on a multi-point displacement meter according to an exemplary embodiment. Figure 1 As shown, it should be noted that the rock formation displacement monitoring method based on the multi-point displacement meter of the embodiment of the present disclosure is applied to the rock formation displacement monitoring device based on the multi-point displacement meter. Figure 1 As shown, the method may include the following steps:

[0065] Step 101 : in response to completing a fracturing operation on a target weakened area corresponding to a goaf by using a surface fracturing well, obtaining preset measurement point distribution data.

[0066] The measurement point distribution data is determined based on the rock formation information corresponding to the surface fracturing well; a casing is provided inside the surface fracturing well.

[0067] In one embodiment, Figure 4 、 Figure 5 As shown, a partial area of ​​the surface fracturing well 6 can be used as a monitoring well for rock formation movement.

[0068] In one embodiment, stratum information at different depths of a ground fracturing well, such as stratum height and stratum type, can be obtained during the drilling process. The measurement point locations for stratum movement can be determined based on the stratum information to obtain measurement point distribution data.

[0069] In some embodiments of the present application, before step 101, the method may further include:

[0070] Obtaining rock formation information corresponding to a surface fracturing well; the rock formation information includes the rock formation heights of multiple rock formations corresponding to the depths of the surface fracturing well; the rock formation heights are the heights of the rock formations adjacent to the surface fracturing well;

[0071] Selecting multiple target rock layers from multiple rock layers based on rock layer distribution information; the multiple target rock layers are determined based on key layers in the multiple rock layers;

[0072] For each target rock formation, a first depth position corresponding to a position adjacent to the target rock formation and the surface fracturing well is determined as an initial measurement point depth;

[0073] The measurement point distribution data is determined based on the initial measurement point depth corresponding to each target rock layer.

[0074] In the embodiment of the present application, each target rock layer is a key layer, and the last target rock layer (that is, the target rock layer at the deepest depth) needs to consider the coal seam mining height problem and the collapse zone range. For example, the last target rock layer is determined to be the second key layer above the coal seam.

[0075] In one embodiment, the above-mentioned first depth position is the middle value between the top depth and the bottom depth of the target coal seam. That is, in order to more accurately detect the movement of the key layer, it is necessary to select the middle position as the monitoring point. This can avoid the monitoring point being too high or too low, resulting in the collected displacement data being unable to represent the overall situation of the rock formation, thereby improving the accuracy of the monitoring results.

[0076] As an example, the initial measuring point depth is the measuring point distribution data, and the initial measuring point depth is determined as the depth of the displacement sensor node and the casing borehole.

[0077] In one embodiment, the key strata can be identified as follows: When multiple strata exist within a stope's overburden, the strata that completely or partially controls rock mass movement are called key strata. The movement of these key strata can significantly impact the mine pressure, rock movement, and surface subsidence throughout the stope. Drawing on this concept, one or more strata among the numerous overburden strata described above that play a dominant role in inducing rock bursts are considered key rock burst-inducing strata.

[0078] First, the key layer is identified. Assuming that a certain rock layer is the key layer and the range controlled by this rock layer reaches the nth layer, the condition for the n+1th layer to become the second key layer is:

[0079]

[0080] Among them, q n+1 ,q n The load on the first key layer when calculating the n+1th layer and the nth layer respectively; h iis the thickness of the rock layer; γ i is the weight of the rock layer; E i is the elastic modulus of the rock formation.

[0081] Therefore, the key layer can be determined according to the following procedure:

[0082] First, using the specific geological histogram of rock formation occurrence, based on the thickness and lithology of the key layer, the thick rock layer that may become the key layer is preliminarily determined as the basis for determining the main key position;

[0083] Then, based on the stiffness conditions of the key layers, further determine the objects that require strength condition judgment:

[0084]

[0085] If the above formula is true, it means that the rock layer may become the key layer, and so on to the last layer of hard rock. Therefore, according to the above formula, the rock layers involved can be identified layer by layer from top to bottom until the position of the hard rock layer at the top that may become the key layer is determined;

[0086] In addition to meeting the requirements of the above formula, the key layer also needs to meet the strength conditions required for the key layer to determine whether the nth layer is a key layer. In other words, the breaking distance of the overlying hard rock layer is required to be greater than the breaking distance of the underlying hard rock layer:

[0087]

[0088] Among them, l j is the breaking distance of the jth rock layer; k is the number of hard rock layers; h j is the thickness of the rock layer; R Tj is the tensile strength of the rock formation; q j is the load borne by the rock formation;

[0089] If the jth hard rock layer does not satisfy the above formula, all the rock layer loads controlled by the j+1th hard rock layer should be applied to the kth layer, and the breaking distance of the kth hard rock layer should be recalculated before continuing the judgment.

[0090] Step 102: Based on the measurement point distribution information, control the drilling equipment to drill the casing to obtain a plurality of boreholes that match the measurement point distribution information.

[0091] Among them, such as Figure 5 As shown, the distributed displacement sensor 1 includes a plurality of sensor nodes 11 ; the plurality of sensor nodes correspond to the plurality of boreholes one by one; and each of the plurality of sensor nodes is connected to a signal receiver 5 .

[0092] In one embodiment, a sensor node is installed in each borehole.

[0093] In some embodiments of the present application, the surface fracturing well includes a vertical section, a deflection section, and a horizontal section. Step 102 may specifically include: controlling a drilling device to drill a casing in the vertical section based on the measurement point distribution information to obtain a plurality of boreholes that match the measurement point distribution information;

[0094] Step 104 may specifically include: obtaining the initial measurement point depth of each sensor node, where the initial measurement point depth is the distance between the sensor node and the ground surface; for each sensor node, obtaining the height change value sent by the sensor node, and determining the sum of the height change value and the initial measurement point depth of the sensor node as the displacement monitoring information corresponding to the sensor node.

[0095] In an embodiment of the present application, distributed sensors may be arranged in the vertical section to monitor the movement of the rock formations within the range covered by the vertical section.

[0096] In other embodiments of the present application, the surface fracturing well includes a vertical section, a deflection section, and a horizontal section. Step 102 may further include: controlling a drilling device to drill casing in the vertical section and the deflection section based on the measurement point distribution information to obtain a plurality of boreholes that match the measurement point distribution information;

[0097] Step 104 may specifically include:

[0098] For each sensor node located in the vertical segment, the height change value sent by the sensor node is obtained, and the sum of the height change value and the initial measurement point depth of the sensor node is determined as the displacement monitoring information corresponding to the sensor node;

[0099] For each sensor node located in the slope section, obtain the height change value sent by the sensor node, and use the following formula to calculate the displacement monitoring information corresponding to the sensor node:

[0100] H=H1+h·sinα

[0101] Where H is the depth of the sensor node after displacement, H1 is the initial measurement point depth of the sensor node, h is the height change value, and α is the angle between the tangent line of the monitoring point where the sensor node is located and the deflection section and the horizontal plane;

[0102] The depth of the sensor node after displacement is determined as the displacement monitoring information of the sensor node.

[0103] In an embodiment of the present application, distributed sensor nodes may be arranged in both the vertical section and the deflection section, so as to monitor the movement of the rock formations covered by the vertical section and the deflection section.

[0104] Step 103 : For each sensor node, install the sensor node into the corresponding drill hole.

[0105] In some embodiments of the present application, Figure 5 As shown, a plurality of sensor nodes 11 are connected in parallel via lines.

[0106] It should be noted that, compared with connecting multiple sensor nodes in series through lines, connecting in parallel can avoid the situation where some sensor nodes cannot work properly and cause other sensor nodes to also not work.

[0107] In some embodiments of the present application, after step 103, the method may further include the following steps: using a wellhead wiring device to securely connect the line to a sensor fixture, and the sensor fixture is installed at the wellhead position of the surface fracturing well.

[0108] In the embodiments of this application, Figure 5 and Figure 6 As shown, in order to fix the lines used to connect multiple sensor nodes 11 to avoid the lines shaking during the movement of the rock formation 3, causing the sensor nodes 11 to move relative to the rock formation, causing the sensor nodes 11 to be separated from the borehole and unable to collect data normally, a wellhead wiring device is used to bundle the lines, and then the wiring device is fixedly connected to the sensor fixing part 2, and the sensor fixing part 2 is fixed at the wellhead position of the ground fracturing well 6, which further improves the accuracy of rock formation movement monitoring.

[0109] Step 104: Using a signal receiver to acquire the monitoring data sent by each sensor node in real time, and determining the displacement monitoring information of the rock formation based on the monitoring data.

[0110] In the embodiment of the present application, the specific implementation method of step 104 can be implemented by any feasible method proposed in the present application, which will not be described in detail here.

[0111] Furthermore, it should be noted that in-situ monitoring using surface boreholes is used to determine the internal movement patterns of the mining-induced rock formation. Displacement sensor nodes are deployed at multiple target levels to monitor the movement of the rock formation. Displacement signal receivers are connected to each displacement sensor at the borehole mouth. These sensors can be equipped with solar cells and data storage and transmission modules to enable online monitoring. The internal rock movement data obtained from the monitoring actually reflects the relative displacement between the measuring points at each layer and the surface. The entire borehole is sealed during monitoring.

[0112] Furthermore, the sensor nodes deform in coordination with the surrounding rock formations. The displacement changes at the sensor nodes represent the deformation of the overburden. When the overburden deforms due to mining, monitoring multiple key layers of the rock formation reveals displacement changes at different monitoring levels. As the working face advances toward or away from the monitoring hole, the monitored values ​​vary due to the rock formation movement caused by mining.

[0113] According to an embodiment of the present disclosure, a method for monitoring rock formation displacement based on a multi-point displacement meter is proposed. In response to a fracturing operation being completed on a target weakened area corresponding to a goaf using a surface fracturing well, preset measurement point distribution data is obtained. The measurement point distribution data is determined based on rock formation information corresponding to the surface fracturing well. Casing is provided within the surface fracturing well. Based on the measurement point distribution information, a drilling device is controlled to drill the casing to obtain multiple boreholes matching the measurement point distribution information. The distributed displacement sensor includes multiple sensor nodes, each corresponding to a plurality of boreholes. Each of the multiple sensor nodes is connected to a signal receiver. For each sensor node, the sensor node is installed in the corresponding borehole. The signal receiver obtains monitoring data sent by each sensor node in real time, and rock formation displacement monitoring information is determined based on the monitoring data. Thus, the surface fracturing well is used as a monitoring well for rock formation displacement. The distributed displacement sensor is used to comprehensively monitor the displacement information of multiple rock formations corresponding to the surface fracturing well, thereby improving the utilization rate of the surface fracturing well and the comprehensiveness and accuracy of rock formation displacement monitoring.

[0114] Figure 7 FIG1 is a block diagram of a rock formation displacement monitoring device based on a multi-point displacement meter according to an exemplary embodiment. Figure 7 The device includes an acquisition unit 701, a drilling unit 702, an installation unit 703 and a determination unit 704.

[0115] The acquisition unit 701 is configured to acquire preset measurement point distribution data in response to completing a fracturing operation on a target weakened area corresponding to a goaf using a surface fracturing well; the measurement point distribution data is determined based on rock formation information corresponding to the surface fracturing well; and the surface fracturing well is provided with a casing.

[0116] The drilling unit 702 is configured to control a drilling device to drill the casing based on the measuring point distribution information, thereby obtaining a plurality of boreholes matching the measuring point distribution information; wherein the distributed displacement sensor includes a plurality of sensor nodes; the plurality of sensor nodes correspond one-to-one to the plurality of boreholes; and each of the plurality of sensor nodes is connected to a signal receiver;

[0117] An installation unit 703 is used to install each sensor node into a corresponding drill hole;

[0118] The determining unit 704 is configured to use the signal receiver to acquire the monitoring data sent by each sensor node in real time, and determine the displacement monitoring information of the rock formation based on the monitoring data.

[0119] In some embodiments of the present application, the apparatus may further include:

[0120] The acquisition unit 701 is further configured to acquire rock formation information corresponding to the surface fracturing well; the rock formation information includes rock formation heights of respective rock formations corresponding to the depths of the surface fracturing well; the rock formation heights are heights of rock formations adjacent to the surface fracturing well;

[0121] a selection unit, configured to select a plurality of target rock layers from the plurality of rock layers based on the rock layer distribution information; the plurality of target rock layers are determined based on key layers among the plurality of rock layers;

[0122] The determining unit 704 is further configured to determine, for each target rock formation, a first depth position corresponding to a position adjacent to the surface fracturing well of the target rock formation as an initial measuring point depth;

[0123] The determining unit 704 is further configured to determine the measuring point distribution data based on the initial measuring point depth corresponding to each target rock layer.

[0124] In some embodiments of the present application, the surface fracturing well includes a vertical section, a deflection section, and a horizontal section. The drilling unit 702 can be specifically used to:

[0125] Based on the measurement point distribution information, controlling the drilling equipment to drill the casing in the vertical section to obtain a plurality of boreholes matching the measurement point distribution information;

[0126] The determining unit 704 may be specifically configured to:

[0127] Obtaining an initial measurement point depth of each sensor node; the initial measurement point depth is the distance between the sensor node and the ground surface;

[0128] For each sensor node, a height change value sent by the sensor node is acquired, and the sum of the height change value and the initial measurement point depth of the sensor node is determined as displacement monitoring information corresponding to the sensor node.

[0129] In some embodiments of the present application, the surface fracturing well includes a vertical section, a deflection section, and a horizontal section. The drilling unit 702 can be specifically used to:

[0130] Based on the measurement point distribution information, controlling the drilling equipment to drill the casing in the vertical section and the deflection section to obtain a plurality of boreholes matching the measurement point distribution information;

[0131] The determining unit 704 may be specifically configured to:

[0132] For each sensor node located in the vertical segment, obtaining a height change value sent by the sensor node, and determining the sum of the height change value and the initial measurement point depth of the sensor node as displacement monitoring information corresponding to the sensor node;

[0133] For each sensor node located in the build section, the height change value sent by the sensor node is obtained, and the displacement monitoring information corresponding to the sensor node is calculated using the following formula:

[0134] H=H1+h·sinα

[0135] Wherein, H is the depth of the sensor node after displacement, H1 is the initial measurement point depth of the sensor node, h is the height change value, and α is the angle between the tangent line of the monitoring point where the sensor node is located and the deflection section and the horizontal plane;

[0136] The depth of the sensor node after displacement is determined as the displacement monitoring information of the sensor node.

[0137] In some embodiments of the present application, the plurality of sensor nodes are connected in parallel via lines.

[0138] In some embodiments of the present application, the apparatus may further include:

[0139] The fixing unit is used to fix the line to the sensor fixing piece by using a wellhead cable bundle device, and the sensor fixing piece is installed at the wellhead position of the surface fracturing well.

[0140] Regarding the apparatus in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0141] According to an embodiment of the present disclosure, a rock formation displacement monitoring device based on a multi-point displacement meter obtains preset measurement point distribution data in response to a fracturing operation completed on a target weakened area corresponding to a goaf using a surface fracturing well. The measurement point distribution data is determined based on rock formation information corresponding to the surface fracturing well. The surface fracturing well is provided with a casing. Based on the measurement point distribution information, a drilling device is controlled to drill the casing to obtain multiple boreholes matching the measurement point distribution information. The distributed displacement sensor includes multiple sensor nodes, each of which corresponds to a plurality of boreholes. Each of the multiple sensor nodes is connected to a signal receiver. For each sensor node, the sensor node is installed in the corresponding borehole. The signal receiver obtains the monitoring data sent by each sensor node in real time and determines rock formation displacement monitoring information based on the monitoring data. Thus, the surface fracturing well is used as a monitoring well for rock formation displacement. The distributed displacement sensor is used to comprehensively monitor the displacement information of multiple rock formations corresponding to the surface fracturing well, thereby improving the utilization rate of the surface fracturing well and the comprehensiveness and accuracy of rock formation displacement monitoring.

[0142] Figure 8This is a block diagram illustrating an apparatus for a method for monitoring rock formation displacement using a multi-point displacement meter, according to an exemplary embodiment. For example, apparatus 800 may be an electronic device, such as a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, or the like.

[0143] Reference Figure 8 , the apparatus 800 may include one or more of the following components: a processing component 802 , a memory 804 , a power component 806 , a multimedia component 808 , an audio component 810 , an input / output (I / O) interface 812 , a sensor component 814 , and a communication component 816 .

[0144] The processing component 802 generally controls the overall operation of the device 800, such as operations associated with display, phone calls, data communications, camera operation, and recording operations. The processing component 802 may include one or more processors 820 to execute instructions to perform all or part of the steps of the above-described method. In addition, the processing component 802 may include one or more modules to facilitate interaction between the processing component 802 and other components. For example, the processing component 802 may include a multimedia module to facilitate interaction between the multimedia component 808 and the processing component 802.

[0145] The memory 804 is configured to store various types of data to support operations on the device 800. Examples of such data include instructions for any application or method operating on the device 800, contact data, phone book data, messages, pictures, videos, etc. The memory 804 can be implemented by any type of volatile or non-volatile storage device, or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk, or optical disk.

[0146] The power component 806 provides power to the various components of the device 800. The power component 806 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to the device 800.

[0147] The multimedia component 808 includes a screen that provides an output interface between the device 800 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen can be implemented as a touch screen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor can not only sense the boundaries of the touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 808 includes a front camera and / or a rear camera. When the device 800 is in an operating mode, such as a shooting mode or a video mode, the front camera and / or the rear camera can receive external multimedia data. Each front camera and rear camera can be a fixed optical lens system or have a focal length and optical zoom capability.

[0148] The audio component 810 is configured to output and / or input audio signals. For example, the audio component 810 includes a microphone (MIC), which is configured to receive external audio signals when the device 800 is in an operating mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signal can be further stored in the memory 804 or transmitted via the communication component 816. In some embodiments, the audio component 810 also includes a speaker for outputting audio signals.

[0149] I / O interface 812 provides an interface between processing component 802 and peripheral interface modules, such as a keyboard, click wheel, buttons, etc. These buttons may include but are not limited to: a home button, volume buttons, a start button, and a lock button.

[0150] The sensor assembly 814 includes one or more sensors for providing various aspects of the status assessment of the device 800. For example, the sensor assembly 814 can detect the open / closed state of the device 800, the relative positioning of components, such as the display and keypad of the device 800. The sensor assembly 814 can also detect changes in the position of the device 800 or a component of the device 800, the presence or absence of user contact with the device 800, the orientation or acceleration / deceleration of the device 800, and temperature changes of the device 800. The sensor assembly 814 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor assembly 814 may also include an optical sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 814 may also include an accelerometer, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0151] The communication component 816 is configured to facilitate wired or wireless communication between the device 800 and other devices. The device 800 can access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 816 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 816 also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology and other technologies.

[0152] In an exemplary embodiment, the apparatus 800 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to perform the above-described method.

[0153] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory 804 including instructions, and the instructions can be executed by the processor 820 of the apparatus 800 to perform the above method. For example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0154] In an exemplary embodiment, a computer program product is also provided, comprising a computer program, which implements the above method when executed by the processor 820 of the apparatus 800 .

[0155] Other embodiments of the present invention will readily occur to those skilled in the art after considering the specification and practicing the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention that follow from the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the invention being indicated by the following claims.

[0156] It should be understood that the present invention is not limited to the exact construction described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A rock formation displacement monitoring method based on a multi-point displacement meter, characterized in that: include: In response to completing a fracturing operation on a target weakened area corresponding to the goaf using a surface fracturing well, obtaining preset measurement point distribution data; The measuring point distribution data is determined based on the rock formation information corresponding to the surface fracturing well; a casing is provided inside the surface fracturing well; Based on the measurement point distribution information, a drilling device is controlled to drill the casing to obtain a plurality of boreholes matching the measurement point distribution information; wherein the distributed displacement sensor includes a plurality of sensor nodes; the plurality of sensor nodes correspond one-to-one to the plurality of boreholes; and each of the plurality of sensor nodes is connected to a signal receiver; For each sensor node, installing the sensor node into the corresponding drill hole; The signal receiver is used to acquire the monitoring data sent by each sensor node in real time, and the displacement monitoring information of the rock formation is determined based on the monitoring data.

2. The rock formation displacement monitoring method based on a multi-point displacement meter according to claim 1 is characterized in that: Before obtaining preset measurement point distribution data in response to completing the fracturing operation of the target weakened area corresponding to the goaf using the surface fracturing well, the method further includes: Obtaining rock formation information corresponding to the surface fracturing well; the rock formation information includes rock formation heights of multiple rock formations corresponding to the depths of the surface fracturing well; the rock formation heights are heights of rock formations adjacent to the surface fracturing well; selecting a plurality of target rock layers from the plurality of rock layers based on the rock layer distribution information; the plurality of target rock layers are determined based on key layers among the plurality of rock layers; For each target rock formation, determining a first depth position corresponding to a position adjacent to the surface fracturing well of the target rock formation as an initial measuring point depth; The measuring point distribution data is determined based on the initial measuring point depth corresponding to each target rock formation.

3. The rock formation displacement monitoring method based on a multi-point displacement meter according to claim 1 is characterized in that: The surface fracturing well includes a vertical section, a deflection section, and a horizontal section; and based on the measurement point distribution information, controlling the drilling equipment to drill the casing to obtain a plurality of boreholes matching the measurement point distribution information, including: Based on the measurement point distribution information, controlling the drilling equipment to drill the casing in the vertical section to obtain a plurality of boreholes matching the measurement point distribution information; The method of using the signal receiver to acquire the monitoring data sent by each sensor node in real time and determining the displacement monitoring information of the rock formation based on the monitoring data includes: Obtaining an initial measurement point depth of each sensor node; the initial measurement point depth is the distance between the sensor node and the ground surface; For each sensor node, a height change value sent by the sensor node is acquired, and the sum of the height change value and the initial measurement point depth of the sensor node is determined as displacement monitoring information corresponding to the sensor node.

4. The rock formation displacement monitoring method based on a multi-point displacement meter according to claim 1 is characterized in that: The surface fracturing well includes a vertical section, a deflection section and a horizontal section; The step of controlling a drilling device to drill the casing based on the measuring point distribution information to obtain a plurality of boreholes matching the measuring point distribution information includes: Based on the measurement point distribution information, controlling the drilling equipment to drill the casing in the vertical section and the deflection section to obtain a plurality of boreholes matching the measurement point distribution information; The method of using the signal receiver to acquire the monitoring data sent by each sensor node in real time and determining the displacement monitoring information of the rock formation based on the monitoring data includes: For each sensor node located in the vertical segment, obtaining a height change value sent by the sensor node, and determining the sum of the height change value and the initial measurement point depth of the sensor node as displacement monitoring information corresponding to the sensor node; For each sensor node located in the build section, the height change value sent by the sensor node is obtained, and the displacement monitoring information corresponding to the sensor node is calculated using the following formula: H=H1+h·sinα Wherein, H is the depth of the sensor node after displacement, H1 is the initial measurement point depth of the sensor node, h is the height change value, and α is the angle between the tangent line of the monitoring point where the sensor node is located and the deflection section and the horizontal plane; The depth of the sensor node after displacement is determined as the displacement monitoring information of the sensor node.

5. The rock formation displacement monitoring method based on a multi-point displacement meter according to claim 1 is characterized in that: The plurality of sensor nodes are connected in parallel via lines.

6. The rock formation displacement monitoring method based on a multi-point displacement meter according to claim 5 is characterized in that: After installing each sensor node into a corresponding borehole, the method further includes: The line is fixedly connected to the sensor fixing piece by using a wellhead wiring device, and the sensor fixing piece is installed at the wellhead position of the surface fracturing well.

7. A rock displacement monitoring device based on a multi-point displacement meter, characterized in that: include: an acquisition unit, configured to acquire preset measurement point distribution data in response to completing a fracturing operation on a target weakened area corresponding to the goaf using a surface fracturing well; The measuring point distribution data is determined based on the rock formation information corresponding to the surface fracturing well; a casing is provided inside the surface fracturing well; a drilling unit, configured to control a drilling device to drill the casing based on the measuring point distribution information, thereby obtaining a plurality of boreholes matching the measuring point distribution information; wherein the distributed displacement sensor includes a plurality of sensor nodes; the plurality of sensor nodes correspond one-to-one to the plurality of boreholes; and each of the plurality of sensor nodes is connected to a signal receiver; An installation unit, configured to install each sensor node into a corresponding drill hole; The determining unit is configured to use the signal receiver to acquire the monitoring data sent by each sensor node in real time, and determine the displacement monitoring information of the rock formation based on the monitoring data.

8. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method according to any one of claims 1 to 6 is implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

10. A computer program product comprising a computer program, characterized in that The computer program implements the method according to any one of claims 1 to 6 when executed by a processor.

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