Multi-dimensional integrated layout and monitoring method for micro-leakage points, lines and surfaces in gas storage well fields

Abstract

The present invention discloses a multi-dimensional integrated layout and monitoring method for micro-leakage points on a gas storage well site, including a sensor layout method and a well site micro-leakage monitoring method. Among them, the sensor layout method includes: arranging a line-type laser methane detector so that the detection path of the line-type laser methane detector remains horizontal and passes through the center of at least one salt cavern wellhead and at least one pipeline valve group; arranging a first point-type methane detection sensor; arranging a number of second point-type methane detection sensors. The beneficial effects of the technical solution provided by the present invention are: arranging one line-type laser methane detector to pass through the wellhead and the center of the pipeline valve group, and then reasonably arranging 2-3 point-type methane detection sensors in 2-3 key point areas. Through joint analysis of points, lines, and surfaces, it is possible to achieve an integrated safety monitoring and detection layout of "points, lines, and surfaces" for micro-leakage on the well site and multi-layer grid high-precision real-time monitoring and analysis.

Description

Technical Field

[0001] The present invention relates to the technical field of safety monitoring for micro-leakage in a salt cavern gas storage well site, and in particular to a multi-dimensional integrated layout and monitoring method for micro-leakage points, lines and surfaces in a gas storage well site. Background Art

[0002] As an underground granary for natural gas, a salt cavern gas storage is the best geological body for underground storage and supply regulation of natural gas. With the continuous injection, production and supply of natural gas and seasonal peak shaving, it is inevitable that there will be some minor leaks in the well site of the salt cavern gas storage. The leakage of natural gas not only causes direct economic losses to the country, but also is a source of inflammable and explosive substances, bringing huge potential safety hazards to the safe production of salt cavern gas injection and production wells.

[0003] At present, the gas leakage detectors and their layout methods in the well site generally include the following two schemes:

[0004] Scheme 1: As shown in Figure 1 , referring to the real-time monitoring layout method of multiple point-type infrared methane sensors in the traditional oil and gas industry, install multiple point-type infrared / laser methane detectors (about 500 - 3000 yuan per unit, and its detection principle can refer to the Chinese invention patent with the publication number CN111504929A) along the valve groups and wellheads of the pipeline. Generally, one unit is installed every 20 meters. For the area size of the salt cavern gas storage well site, about 10 units need to be arranged. This scheme has the following problems: (a) Although the cost of the overall layout scheme may be relatively low (the total cost is about 50,000 yuan), since each sensor requires a power line and a communication signal line, the wiring is relatively cumbersome, and the probe of each sensor must protrude above the ground to form independent columns, occupying a large operation space and causing chaos and ugliness in the equipment and facilities in the field area. (b) Since it is multi-point monitoring, the real-time monitoring data generated are all multi-point type, and the real-time monitoring data cannot monitor the areas outside the non-monitoring points, that is, it cannot cover the entire pipeline and a certain area, nor can it directly form a relatively intuitive methane detection data image in the field area. (c) In addition, the infrared point-type detection sensor is extremely vulnerable to the influence of wind direction and weather, and the real-time detection data fluctuates greatly, with a high false alarm rate. (d) In addition, with the alternation of seasons in the field area, including wind, snow, thunder and lightning, the point-type sensors are also prone to damage and regular calibration, and the later maintenance cost is relatively high and cumbersome. Therefore, at present, point-type methane sensors are generally rarely arranged in a large area in the well site.

[0005] Scheme 2: As shown in Figure 2As shown in the figure, in order to overcome the drawbacks of installing many point sensors in the traditional multi-point installation method, the newly developed device, the telemetry laser methane detector, can achieve point-line scanning and telemetry, and can overcome the above-mentioned drawbacks. However, at present, this device is still in the R & D and testing stage, and the installation and testing cost is as high as more than 300,000 yuan. In addition, the measurement accuracy (about 50 ppm) and stability of this device are relatively poor, significantly inferior to the accuracy of the point laser methane detector, and cannot meet the actual monitoring requirements. Summary of the Invention

[0006] In view of this, it is necessary to provide a multi-dimensional integrated layout and monitoring method for micro-leakage point, line and surface in a gas storage well field to solve the technical problem that the existing gas leakage detectors in the well field and their layout methods cannot effectively achieve multi-dimensional monitoring of micro-leakage point, line and surface in the gas storage well field.

[0007] In order to achieve the above object, the present invention provides a multi-dimensional integrated layout and monitoring method for micro-leakage point, line and surface in a gas storage well field, which is characterized in that it includes a sensor layout method and a well field micro-leakage monitoring method, wherein,

[0008] The sensor layout method includes:

[0009] Arrange a linear laser methane detector so that the detection path of the linear laser methane detector remains horizontal and passes through the center of at least one salt cavern wellhead and at least one pipeline valve group;

[0010] Arrange a first point-type methane detection sensor within a preset distance range from the center of the detection path;

[0011] Arrange a number of second point-type methane detection sensors, and the included angle between the connection line formed by each of the second point-type methane detection sensors and the first point-type methane detection sensor and the detection path is between 70° and 110°, and the height of the detection path, the detection height of the first point-type methane detection sensor, and the detection heights of each of the second point-type methane detection sensors are all not equal;

[0012] The sensor layout satisfies the following criteria:

[0013] (1) The salt cavern wellhead is within the detection range of the linear laser methane detector, the first point-type methane detection sensor or the second point-type methane detection sensor;

[0014] (2) The pipeline valve group is within the detection range of the linear laser methane detector, the first point-type methane detection sensor or the second point-type methane detection sensor;

[0015] (3) The detection path of the linear laser methane detector passes through within 3 meters around the center points of at least one salt cavern wellhead and at least one pipeline valve group at the same time, and the detection path is free of obstructions;

[0016] (4) The first point-type methane detection sensor is close to the middle area of the detection path of the line-type laser methane detector, and the second point-type methane detection sensors are installed on the diagonal line of the detection path of the line-type laser methane detector and are close to the well site edge at the same time;

[0017] (5) Ensure that the detection path of the line-type laser methane detector is near a certain diagonal line of the well site, and ensure that each second point-type methane detection sensor is arranged near the other diagonal line;

[0018] (6) Ensure that the height of the detection path of the line-type laser methane detector is more than 1.2 meters above the ground of the well site;

[0019] (7) Ensure that the detection height of the first point-type methane detection sensor is 0.2 meters higher than the height of the detection path, and the detection height of each second point-type methane detection sensor is 0.3 meters or 0.4 meters higher than the height of the detection path;

[0020] The well site micro-leakage monitoring method includes:

[0021] Obtain and record in real time the detection data of the line-type laser methane detector, the first point-type methane detection sensor and each second point-type methane detection sensor respectively;

[0022] Construct a three-dimensional space coordinate system according to the layout positions and heights of the line-type laser methane detector, the first point-type methane detection sensor and each second point-type methane detection sensor, and substitute the detection data of the line-type laser methane detector, the first point-type methane detection sensor and each second point-type methane detection sensor into the three-dimensional space coordinate system to assign values to some coordinate points in the three-dimensional space coordinate system;

[0023] Perform data interpolation on the unassigned coordinate points in the three-dimensional space coordinate system;

[0024] Build a multi-layer grid data system according to the three-dimensional space coordinate system after data interpolation, and generate a multi-layer grid data chart according to the multi-layer grid data system.

[0025] In some embodiments, the line-type laser methane detector includes a line-type laser methane detector main unit and a reflector, and both the line-type laser methane detector main unit and the reflector are installed on the well site boundary.

[0026] In some embodiments, when the gas storage well site only has 1 salt cavern wellhead and 1 set of pipeline valve groups, the detection path passes through the center of the salt cavern wellhead and the pipeline valve group, and each second point-type methane detection sensor is located on both sides of the detection path and is arranged close to the well site boundary.

[0027] In some embodiments, when the gas storage reservoir well site has 2 salt cavern wellheads and 1 set of pipeline valve groups, the detection path passes through one of the salt cavern wellheads and the center of the pipeline valve group. One of the second point-type methane detection sensors is located at the other salt cavern wellhead, and the remaining second point-type methane detection sensors are respectively located on both sides of the detection path and are arranged close to the well site boundary.

[0028] In some embodiments, when the gas storage reservoir well site has 1 salt cavern wellhead and 2 sets of pipeline valve groups, the detection path passes through the salt cavern wellhead and the center of one of the pipeline valve groups. One of the second point-type methane detection sensors is located at the center of the other set of pipeline valve groups, and the remaining second point-type methane detection sensors are respectively located on both sides of the detection path and are arranged close to the well site boundary.

[0029] In some embodiments, the detection path is distributed along the diagonal of the well site.

[0030] In some embodiments, when the gas storage reservoir well site has 2 salt cavern wellheads and 2 sets of pipeline valve groups, the detection path passes through at least one of the salt cavern wellheads and the center of at least one of the pipeline valve groups.

[0031] In some embodiments, the height of the detection path is greater than 1.2 meters.

[0032] In some embodiments, the detection height of the first point-type methane detection sensor is 0.2 meters higher than the height of the detection path, and the detection heights of the respective second point-type methane detection sensors are 0.3 meters or 0.4 meters higher than the height of the detection path.

[0033] In some embodiments, data interpolation is performed on the unassigned coordinate points in the three-dimensional space coordinate system, specifically:

[0034] According to the black oil model and the component model, data interpolation is performed on the unassigned coordinate points in the three-dimensional space coordinate system.

[0035] Compared with the prior art, the beneficial effects of the technical solution proposed by the present invention are as follows: Since the area of the salt cavern gas storage well site is not large and relatively small, the possible leakage points in the site are mainly the salt cavern wellhead and the pipeline valve group area. Therefore, one line-type laser methane detector is arranged to pass through the wellhead and the center of the pipeline valve group, and then 2-3 point-type methane detection sensors are reasonably arranged in 2-3 key point areas. Among them, the first point-type methane detection sensor preferably passes through the linear area of the line-type laser methane detector for mutual calibration and verification between the two sets of devices. Finally, through joint analysis of points, lines, and surfaces, the integrated safety monitoring and detection layout of "points, lines, and surfaces" for micro-leakage in the well site and multi-layer grid high-precision real-time monitoring and analysis can be realized, and the monitoring accuracy is 1 ppm. Through comprehensive comparison, it can be seen that the solution described in the present invention has the highest cost performance and remarkable effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a schematic diagram of the real-time monitoring layout scheme of traditional multiple point-type infrared methane sensors;

[0037] Figure 2 is a schematic diagram of the layout scheme of a telemetry laser methane detector;

[0038] Figure 3 is a schematic diagram of the multi-dimensional integrated layout scheme of micro-leakage points, lines, and surfaces in the gas storage well site provided by the present invention (1 salt cavern wellhead and 1 set of pipeline valve groups);

[0039] Figure 4 is the installation and deployment effect diagram based on the line-type laser methane detector;

[0040] Figure 5 is another schematic diagram of the layout scheme provided by the present invention (2 salt cavern wellheads and 1 set of pipeline valve groups);

[0041] Figure 6 is another schematic diagram of the layout scheme provided by the present invention (1 salt cavern wellhead and 2 sets of pipeline valve groups);

[0042] Figure 7 is another schematic diagram of the layout scheme provided by the present invention (2 salt cavern wellheads and 2 sets of pipeline valve groups);

[0043] Figure 8 is a schematic diagram of the flow of the multi-layer grid high-precision real-time monitoring and analysis method provided by the present invention;

[0044] Figure 9 is an example of the detection data of the line-type laser methane detector;

[0045] Figure 10 is an example of the effect diagram of the multi-layer grid analysis result image of the natural gas concentration of micro-leakage in the well site. DETAILED DESCRIPTION OF THE INVENTION

[0046] The preferred embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings. The accompanying drawings form a part of this application and are used together with the embodiments of the present invention to explain the principles of the present invention, rather than to limit the scope of the present invention.

[0047] Please refer to Figures 3 - 8 , the present invention provides a multi-dimensional integrated layout and monitoring method for micro-leakage points on a gas storage well site, including a sensor layout method and a well site micro-leakage monitoring method. Among them,

[0048] The sensor layout method includes:

[0049] S110. Arrange a line-type laser methane detector so that the detection path of the line-type laser methane detector remains horizontal and passes through the centers of at least one salt cavern wellhead and at least one pipeline valve group;

[0050] S120. Arrange a first point-type methane detection sensor within a preset distance range from the center of the detection path, so that the first point-type methane detection sensor is as close as possible to the detection area of the line-type laser methane detector, for mutual calibration and verification between the two sets of equipment (the line-type laser methane detector and the first point-type methane detection sensor); the line-type laser methane detector includes a line-type laser methane detector main unit and a reflector, and both the line-type laser methane detector main unit and the reflector are installed on the well site boundary, so as to avoid affecting other equipment and facilities in the field area.

[0051] S130. Arrange a number of second point-type methane detection sensors, and the included angle between the connection lines formed by each of the second point-type methane detection sensors and the first point-type methane detection sensor and the detection path is between 70° and 110°. Through such a setting, it can be ensured that the connection line of the detection points of the first point-type methane detection sensor and the second point-type methane detection sensor is approximately perpendicular to the detection path, so as to ensure that the detection sensors achieve the largest coverage area. The height of the detection path, the detection height of the first point-type methane detection sensor, and the detection heights of each of the second point-type methane detection sensors are all not equal, which is conducive to monitoring the methane concentration at different heights and providing a data basis for subsequent drawing of a three-dimensional space methane concentration distribution map;

[0052] The well site micro-leakage monitoring method includes:

[0053] S210. Respectively obtain and record in real time the detection data of the line-type laser methane detector, the first point-type methane detection sensor, and each of the second point-type methane detection sensors;

[0054] S220. Construct a three-dimensional space coordinate system based on the layout positions and heights of the line-type laser methane detector, the first point-type methane detection sensor, and each of the second point-type methane detection sensors, and substitute the detection data of the line-type laser methane detector, the first point-type methane detection sensor, and each of the second point-type methane detection sensors into the three-dimensional space coordinate system to assign values to some coordinate points in the three-dimensional space coordinate system;

[0055] S230. Perform data interpolation on the unassigned coordinate points in the three-dimensional space coordinate system; specifically: perform data interpolation on the unassigned coordinate points in the three-dimensional space coordinate system according to the black oil model and the component model.

[0056] S240. Build a multi-layer grid data system based on the three-dimensional space coordinate system after data interpolation, and generate a multi-layer grid data chart according to the multi-layer grid data system.

[0057] The economic cost of the solution of the present invention is: one line-type laser methane detector (about 80,000 yuan) + 2 - 3 point-type methane detection sensors (a high-precision methane sensor based on the laser detection principle is about 3,000 yuan per unit, and a high-precision methane sensor based on the infrared detection principle is about 500 yuan per unit), and the total cost does not exceed 100,000 yuan. Since the area of the salt cavern gas storage well site is not large, relatively small, and the possible leakage points in the site are mainly the salt cavern wellhead and the pipeline valve group area, therefore, arrange one line-type laser methane detector to pass through the wellhead and the center of the pipeline valve group, and then reasonably arrange 2 - 3 point-type methane detection sensors (including the first point-type methane detection sensor and each of the second point-type methane detection sensors) in 2 - 3 key point areas. Among them, the first point-type methane detection sensor preferably passes through the linear area of the line-type laser methane detector for mutual calibration and verification between the two sets of equipment. Finally, through joint analysis of points - lines - surfaces, the integrated safety monitoring and detection layout of "points - lines - surfaces" for micro-leakage in the well site and multi-layer grid high-precision real-time monitoring and analysis can be realized, and the monitoring accuracy is 1 ppm. Through comprehensive comparison, it can be seen that the solution of the present invention has the highest cost performance and remarkable effects.

[0058] In the technical solution adopted by the present invention, since the detection accuracy of natural gas methane by the point-type laser sensor is the most stable, and the highest detection accuracy can reach 1 ppm. After the multi-dimensional integrated analysis of "points - lines - surfaces", the micro-leakage accuracy that can be monitored in real time by the technical solution of the present invention is not lower than 1 ppm. Therefore, the real-time detection accuracy of the natural gas methane concentration in this technical solution is the highest, the detection data is the most stable, and the real-time monitoring and early warning of micro-leakage in the well site can be realized.

[0059] In the present invention, the multi-layer grid high-precision real-time monitoring and analysis method realizes multi-mode and comprehensive non-blind-spot point-line-plane multi-dimensional integrated real-time monitoring and early warning. One linear laser methane detector and multiple point sensors are reasonably arranged in the salt cavern gas storage well field to achieve "point-line-plane" integrated safety detection and early warning of micro-leakage in the well field, and through the multi-layer grid high-precision real-time monitoring and analysis method, multi-mode and comprehensive non-blind-spot point-line-plane multi-dimensional integrated analysis of the natural gas micro-leakage detection data in the well field is realized, and finally real-time monitoring and early warning data are obtained.

[0060] The main characteristics of the salt cavern gas storage well field are as follows: (1) The area of the well field is generally within a rectangular frame with a width of 30 meters and a length of 40 meters; (2) There are generally 1-2 sets of pipeline valve group areas in the well field; (3) There are generally 1-2 salt caverns in the well field, that is, there are 1-2 wellheads; (4) The ground in the well field is flat and there is no obstruction around. It should be noted that: Since the salt cavern wellhead and the pipeline valve group area in the field are the areas where natural gas methane is most likely to leak, sensors must be installed at the wellhead and the pipeline valve group or be covered by the detectable area.

[0061] Therefore, the main basis and layout criteria for the "point-line-plane" multi-dimensional integrated layout scheme for micro-leakage in the salt cavern gas storage well field of the present invention are as follows:

[0062] (1) The salt cavern wellhead must be within the detection range of the sensor or detector;

[0063] (2) The pipeline valve group must be within the detection range of the sensor, and the key parts should be covered as much as possible;

[0064] (3) The layout path of the linear laser methane detector should preferably pass through the central areas of the salt cavern wellhead and the pipeline valve group at the same time. The laser scanning route should avoid being blocked to prevent affecting the detection data results, and the installation positions of the main unit and the reflector of the linear laser methane detector should be as close as possible to the well field boundary to avoid affecting other equipment and facilities in the field area;

[0065] (4) Among the 2-3 point-type methane detection sensors, one should be as close as possible to the middle area of the detection path of the linear laser methane detector for mutual calibration and verification between the two sets of equipment. The other two point sensors should be installed as close as possible to the diagonal line of the detection path of the linear laser methane detector and be close to the edge at the same time to ensure the largest coverage area;

[0066] (5) Try to ensure that the detection path of the linear laser methane detector is near a certain diagonal line of the well field, and ensure that the 2-3 point sensors are arranged near the other diagonal line.

[0067] (6) Ensure that the height of the detection path of the linear laser methane detector is more than 1.2 meters above the well field ground;

[0068] (7) Ensure that the detection height of the first point-type methane detection sensor is 0.2 meters higher than the height of the detection path, and the detection height of each of the second point-type methane detection sensors is 0.3 meters or 0.4 meters higher than the height of the detection path.

[0069] The following is a detailed description of the sensor layout method in different situations.

[0070] (1) As Figure 3 and Figure 4 , when there is only 1 salt cavern wellhead and 1 set of pipeline valve groups in the gas storage reservoir well site, the detection path passes through the salt cavern wellhead and the center of the pipeline valve group, and each of the second point-type methane detection sensors is located on both sides of the detection path and close to the well site boundary.

[0071] Figure 3 In, dot 1, dot 2, and dot 3 are respectively 3 point-type methane detection sensors, and the long dashed line is the detection path of the line-type laser methane detector. The 3 dots and the long dashed line are all areas where the sensor equipment can truly and accurately detect the natural gas methane leakage concentration. The natural gas leakage volume in this area can be accurately detected in real time. Figure 4 It is the actual installation and deployment effect diagram of the line-type laser methane detector in a certain area of the well site.

[0072] (2) As Figure 5 shown, when there are 2 salt cavern wellheads and 1 set of pipeline valve groups in the gas storage reservoir well site, the detection path passes through one of the salt cavern wellheads and the center of the pipeline valve group, one of the second point-type methane detection sensors is located at the other salt cavern wellhead, and the remaining second point-type methane detection sensors are respectively located on both sides of the detection path and close to the well site boundary.

[0073] Figure 5 In, dot 1, dot 2, and dot 3 are respectively 3 point-type methane detection sensors, and the long dashed line is the detection path of the line-type laser methane detector. The 3 dots and the long dashed line are all areas where the sensor equipment can truly and accurately detect the natural gas methane leakage concentration. The natural gas leakage volume in this area can be accurately detected in real time. Since the two salt cavern wellheads share a set of pipeline valve groups, compared with the layout method in Figure 3 , only need to move the No. 3 point-type sensor and make it as close as possible to the salt cavern wellhead B.

[0074] (3) As Figure 6As shown in the figure, when the gas storage cavern well site has 1 salt cavern wellhead and 2 sets of pipeline valve groups, the detection path passes through the salt cavern wellhead and the center of one of the pipeline valve groups, and one of the second point-type methane detection sensors is located at the center of the other set of pipeline valve groups, and the remaining second point-type methane detection sensors are respectively located on both sides of the detection path and are arranged close to the well site boundary.

[0075] Figure 6 In the figure, dot 1, dot 2, and dot 3 are respectively 3 point-type methane detection sensors, and the long dashed line is the detection path of the line-type laser methane detector. The 3 dots and the long dashed line are all areas where the sensor equipment can truly and accurately detect the natural gas methane leakage concentration. The natural gas leakage volume in this area can be accurately detected in real time. Since the two sets of pipeline valve groups are relatively concentrated and there is only one salt cavern wellhead, it is only necessary to move and offset the main unit and the reflector of the line-type laser methane detector and try to pass through the key areas of the wellhead and the two sets of pipeline valve groups.

[0076] To increase the detection range, please refer to Figure 6 and the detection path is distributed along the diagonal of the well site.

[0077] (4) As Figure 7 shown in the figure, when the gas storage cavern well site has 2 salt cavern wellheads and 2 sets of pipeline valve groups, the detection path passes through at least one of the salt cavern wellheads and the center of at least one of the pipeline valve groups.

[0078] Figure 7 In the figure, dot 1, dot 2, and dot 3 are respectively 3 point-type methane detection sensors, and the long dashed line is the detection path of the line-type laser methane detector. The 3 dots and the long dashed line are all areas where the sensor equipment can truly and accurately detect the natural gas methane leakage concentration. The natural gas leakage volume in this area can be accurately detected in real time. Since it is impossible to pass through the two salt cavern wellheads and the two sets of pipeline valve groups at the same time, it is necessary to swap the diagonal positions of the line-type laser methane detector and move the No. 2 point-type sensor and try to be close to the salt cavern wellhead A, and at the same time ensure that the other two point-type sensors are also arranged at a certain key position on the diagonal of the field.

[0079] The following is a detailed description of the well site micro-leakage monitoring method:

[0080] As Figure 8 shown in the figure, the well site micro-leakage monitoring method includes the following steps:

[0081] Step 1: Obtain and record the detection data in real time respectively. Turn on the line-type laser methane detector and three point-type sensors, and import them into the computer in real time through the 485 serial communication line.

[0082] Step 2: Construct a three-dimensional spatial coordinate system based on the layout positions and heights of the sensors. The computer constructs the three-dimensional coordinates of each group of data according to the data of the line-type laser methane detector and the point sensors received each time, as well as their layout positions and heights. The coordinate style of each point in the three-dimensional coordinate system is: L(x, y, z, p). For example, the height of all the data of the line-type laser methane detector is z = 1.2 m, the abscissa and ordinate respectively correspond to the layout positions (x, y) in the well site, and the corresponding detection value is the p value. An example of the detection data of the line-type laser methane detector is as shown in Figure 9 as shown.

[0083] Step 3: Interpolate the real-time detection data according to the black oil model and the component model. Since the data of the line-type laser methane detector are only the detection data on a line, and the data of the three point sensors are also only the data of three points, therefore, the data at other positions in the well site area need to be deduced and calculated according to a certain rule numerical simulation model method. The numerical simulation model can be the black oil model and the component model, or the missing parts of the numerical values can be supplemented by the hyperbolic interpolation method, so as to supplement the methane detection concentration numerical values at all coordinate positions in the well site.

[0084] Step 4: Build a multi-layer grid data system according to the data at different position heights. Build a multi-layer grid data system according to the three-dimensional spatial coordinate system formed by the above model and its corresponding methane concentration numerical values. According to the different height coordinate positions of the detection data, the grid data can be initially divided into 4 levels, that is, the grid data obtained from the detection data of the line-type laser methane detector at a height of 1.2 m and the grid data formed by the three point sensors at heights of 1.4 m, 1.6 m and 1.7 m.

[0085] Step 5: Generate a multi-layer grid data chart. According to the grid data of each layer and the self-set model parameters, form the corresponding methane concentration curve and three-dimensional plane concentration distribution map. An example of the image effect chart of the multi-layer grid analysis result of the natural gas concentration of a well site micro-leakage is as shown in Figure 10 as shown.

[0086] In summary, the beneficial effects of the technical solution provided by the present invention include:

[0087] (1) Aiming at the characteristics that the monitoring range of the salt cavern gas storage well site is generally small (30m×40m), the main basis and layout criteria of the "point-line-plane" multi-dimensional integrated layout scheme are formed;

[0088] (2) Provide a micro-leakage layout scheme for the salt cavern gas storage well site. This scheme only requires 1 line-type laser methane detector + 2 - 3 point sensors, and has high cost performance.

[0089] (3) Provided is a multi-dimensional integrated high-precision real-time monitoring algorithm for natural gas micro-leakage points, lines, and surfaces, which can achieve multi-layer grid high-precision real-time monitoring.

[0090] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A multi - dimensional integrated layout and monitoring method for micro - leakage points of a gas storage reservoir well site, characterized in that, It includes a sensor arrangement method and a well site micro-leakage monitoring method, wherein: Sensor placement methods include: Arrange a linear laser methane detector so that a detection path of the linear laser methane detector remains horizontal and passes through at least one salt cave wellhead and the center of at least one pipeline valve group; Arranging a first point-type methane detection sensor, wherein the first point-type methane detection sensor is arranged within a preset distance range from the center of the detection path; Arrange a plurality of second point-type methane detection sensors, wherein the angle between the connecting line formed by each of the second point-type methane detection sensors and the first point-type methane detection sensor and the detection path is between 70° and 110°, and the height of the detection path, the detection height of the first point-type methane detection sensor, and the detection height of each of the second point-type methane detection sensors are not equal; The sensor layout meets the following criteria: (1) The salt cave wellhead is within the detection range of the online laser methane detector, the first point methane detection sensor or the second point methane detection sensor; (2) The pipeline valve group is within the detection range of the online laser methane detector, the first point methane detection sensor or the second point methane detection sensor; (3) The detection path of the linear laser methane detector passes through at least one salt cave wellhead and at least one pipeline valve group within 3 meters of the center point, and the detection path is free from obstruction; (4) The first point-type methane detection sensor is located near the middle area of ​​the detection path of the linear laser methane detector, and the second point-type methane detection sensor is installed on the diagonal line of the detection path of the linear laser methane detector and close to the edge of the well site at the same time; (5) Ensure that the detection path of the linear laser methane detector is near a certain diagonal line of the well site, and ensure that each second point methane detection sensor is arranged near another diagonal line; (6) Ensure that the detection path of the linear laser methane detector is above 1.2 meters above the well site ground; (7) ensuring that the detection height of the first point-type methane detection sensor is 0.2 m higher than the height of the detection path, and the detection height of each of the second point-type methane detection sensors is 0.3 m or 0.4 m higher than the height of the detection path; Wellsite micro-leakage monitoring methods include: Respectively acquiring and recording in real time the detection data of the linear laser methane detector, the first point methane detection sensor and each of the second point methane detection sensors; Constructing a three-dimensional space coordinate system according to the layout positions and heights of the linear laser methane detector, the first point methane detection sensor, and each of the second point methane detection sensors, and substituting the detection data of the linear laser methane detector, the first point methane detection sensor, and each of the second point methane detection sensors into the three-dimensional space coordinate system to assign values ​​to some coordinate points in the three-dimensional space coordinate system; Performing data interpolation on unassigned coordinate points in the three-dimensional space coordinate system; According to the three-dimensional space coordinate system after data interpolation, a multi-layer grid data system is constructed, and a multi-layer grid data chart is generated according to the multi-layer grid data system.

2. The multi - dimensional integrated layout and monitoring method for micro - leakage points of a gas storage reservoir well site according to claim 1, characterized in that, The line-type laser methane detector includes a line-type laser methane detector main unit and a reflector, and both the line-type laser methane detector main unit and the reflector are installed at the well site boundary.

3. The multi - dimensional integrated layout and monitoring method for micro - leakage points of a gas storage reservoir well site according to claim 1, characterized in that, When the gas storage well site has only 1 salt cavern wellhead and 1 set of pipeline valve groups, the detection path passes through the salt cavern wellhead and the center of the pipeline valve group, and each of the second point-type methane detection sensors is located on both sides of the detection path and is arranged close to the well site boundary.

4. The multi - dimensional integrated layout and monitoring method for micro - leakage points of a gas storage reservoir well site according to claim 1, characterized in that, When the gas storage well site has 2 salt cavern wellheads and 1 set of pipeline valve groups, the detection path passes through one of the salt cavern wellheads and the center of the pipeline valve group, one of the second point-type methane detection sensors is located at the other salt cavern wellhead, and the remaining second point-type methane detection sensors are located on both sides of the detection path and are arranged close to the well site boundary.

5. The multi - dimensional integrated layout and monitoring method for micro - leakage points of a gas storage reservoir well site according to claim 1, characterized in that, When the gas storage well site has 1 salt cavern wellhead and 2 sets of pipeline valve groups, the detection path passes through the salt cavern wellhead and the center of one of the pipeline valve groups, one of the second point-type methane detection sensors is located at the center of the other set of pipeline valve groups, and the remaining second point-type methane detection sensors are located on both sides of the detection path and are arranged close to the well site boundary.

6. The multi - dimensional integrated layout and monitoring method for micro - leakage points of a gas storage reservoir well site according to claim 5, characterized in that, The detection path is distributed along the diagonal of the well site.

7. The multi - dimensional integrated layout and monitoring method for micro - leakage points of a gas storage reservoir well site according to claim 1, characterized in that, When the gas storage well site has 2 salt cavern wellheads and 2 sets of pipeline valve groups, the detection path passes through at least one of the salt cavern wellheads and the center of at least one of the pipeline valve groups.

8. The multi - dimensional integrated layout and monitoring method for micro - leakage points of a gas storage reservoir well site according to claim 1, characterized in that, The height of the detection path is greater than 1.2 meters.

9. The multi-dimensional integrated layout and monitoring method for micro-leakage points, lines and surfaces in a gas storage reservoir well site according to claim 8, characterized in that, The detection height of the first point-type methane detection sensor is 0.2 meters higher than the height of the detection path, and the detection height of each of the second point-type methane detection sensors is 0.3 meters or 0.4 meters higher than the height of the detection path.

10. The multi-dimensional integrated layout and monitoring method for micro-leakage points, lines and surfaces in a gas storage reservoir well site according to claim 1, characterized in that, Perform data interpolation on the unassigned coordinate points in the three-dimensional space coordinate system. Specifically: Perform data interpolation on the unassigned coordinate points in the three-dimensional space coordinate system according to the black oil model and the component model.

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