Gas well gas injection tubular column leakage point obtaining method, system, equipment and medium

Abstract

The invention discloses a gas well gas injection tubular column leakage point obtaining method, system, equipment and medium, and the method comprises the steps: measuring the actual measurement pressure of an annular tubular column wellhead in response to a leakage signal; calculating the depth of the leakage point according to a pre-constructed leakage point depth calculation model; the leakage point depth calculation model comprises a first relationship among the wellhead pressure of the annular pipe column, the leakage point depth and related parameters of the gas injection pipe column; the depth of the gas injection tubular column changes along with the step length; the initial known parameters are substituted into the first relation and the second relation, the depth of the leakage point is gradually accumulated based on the step length, the wellhead pressure of the annular pipe column is calculated according to the accumulated depth of the leakage point until the difference value between the wellhead pressure of the annular pipe column and the actually measured pressure is within the preset range, and the corresponding depth of the leakage point is output. The positioning of the leakage point position is realized, the leakage point can be quickly found in the process of overhauling the pipe column, and the overhauling efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas well logging, and in particular to a method, system, equipment and medium for obtaining leakage points of a gas injection pipe string in a gas well. Background Art

[0002] During the injection and production process of oil and gas wells, due to the low viscosity and strong diffusion of gas, when there is a leak in the injection and production string, the injected gas will inevitably leak from the high-pressure injection string to the low-pressure injection and production string and the annulus area of ​​the oil layer casing, resulting in annular pressure (composed of multiple annular strings). The annular pressure of the injection and production well will bring huge safety hazards to the wellhead equipment and ground facilities, especially for gas storage wells. Once leakage or loss of control occurs, it will cause irreparable economic losses and cause huge negative social impact on enterprises.

[0003] In the prior art, two methods are used: tracer detection to find leaks and pulling out the tubing to find leaks. However, both methods have obvious shortcomings, as follows: For the tracer detection method to find leaks in the tubing, for different injection gases, it is difficult to determine the type of tracer and it is difficult to lower the tracer detection instrument into the wellbore with the completion tubing, so it is difficult to determine the specific location of the leak. The method of pulling out the tubing to find leaks requires manual inspection of each location, and the leak search is relatively blind, time-consuming, labor-intensive, and difficult to find. Therefore, a method for obtaining the leak point of the gas well injection tubing is needed to obtain the leak location. Summary of the invention

[0004] The embodiments of the present invention at least partially solve the technical problem that the leakage point of the gas well string cannot be located in the prior art by providing a method, system, equipment and medium for obtaining the leakage point of the gas well injection string, and achieve the technical effect of accurately obtaining the leakage point position.

[0005] In the first aspect, to solve the above technical problems, the embodiments of the present invention provide the following technical solutions:

[0006] A method for obtaining a leak point of a gas injection pipe string in a gas well, comprising:

[0007] In response to the leakage signal, measuring the measured pressure at the wellhead of the annulus string;

[0008] The leak depth is calculated according to a leak depth calculation model constructed in advance; the leak depth calculation model includes:

[0009] A first relationship between the wellhead pressure of the annulus string, the depth of the leak point, and the parameters related to the gas injection string; a second relationship between the depth of the gas injection string and the step length;

[0010] The initial known parameters are brought into the first relationship and the second relationship, the leak depth is gradually accumulated based on the step size, and the annulus string wellhead pressure is calculated according to the accumulated leak depth until the difference between the annulus string wellhead pressure and the measured pressure is within a preset range, and the corresponding leak depth is output.

[0011] Optionally, the step of calculating the wellhead pressure of the annular string according to the accumulated leakage point depth specifically includes:

[0012] Obtaining a first depth of the annular air column;

[0013] When the leak point is within the first depth range, the pressure at the leak point of the annulus pipe string is equal to the pressure at the leak point in the annulus air column.

[0014] Optionally, the step of calculating the wellhead pressure of the annulus string according to the accumulated leakage point depth further includes:

[0015] Obtain a second depth of the annular liquid column;

[0016] When the leak point is within the second depth range, the pressure at the leak point of the annulus string is equal to the sum of the pressures of the annulus gas column and the annulus liquid column at the leak point.

[0017] Optionally, after the output of the corresponding leak depth, the method further includes:

[0018] The leak size is calculated according to a leak size calculation model constructed in advance; the leak size calculation model includes:

[0019] a third relationship among the pressure of the annular string at the leakage point, the pressure of the gas injection string, the gas leakage amount and the string size;

[0020] a fourth relationship between the leak point inner diameter, gas leakage, annulus string pressure and gas injection string pressure at the above leak point;

[0021] After substituting the above-mentioned leakage point depth into the above-mentioned third relationship and fourth relationship, the inner diameter of the above-mentioned leakage point is obtained.

[0022] Optionally, when calculating the pressure of the annular column at the leak point, it is characterized in that:

[0023] When the leak point is within the first depth range, the pressure at the leak point of the annulus pipe string is equal to the pressure at the leak point in the annulus air column.

[0024] When the leak point is within the second depth range, the pressure at the leak point of the annulus string is equal to the sum of the pressures of the annulus gas column and the annulus liquid column at the leak point.

[0025] Optionally, the above method further includes:

[0026] When the above-mentioned gas well is a deviated well,

[0027] The depth of the leakage point is equal to the projection depth of the inclined well in the vertical direction.

[0028] Optionally, before responding to the leakage signal, the method further includes:

[0029] A pressure detection device is provided in the annular air column;

[0030] When the pressure value of the above detection device exceeds a preset threshold, the above detection device is triggered to send a leakage signal.

[0031] In a second aspect, a gas well gas injection string leakage point acquisition system is provided, comprising:

[0032] A calculation module is used to calculate the above-mentioned leak point depth according to a leak point depth calculation model constructed in advance; the above-mentioned leak point depth calculation model includes: a first relationship between the above-mentioned annular tubing wellhead pressure, the leak point depth, and the above-mentioned gas injection string related parameters; a second relationship in which the depth of the above-mentioned gas injection string changes with the step size; the initial known parameters are brought into the above-mentioned first relationship and the above-mentioned second relationship, the leak point depth is gradually accumulated based on the above-mentioned step size, and the above-mentioned annular tubing wellhead pressure is calculated according to the accumulated leak point depth, until the difference between the above-mentioned annular tubing wellhead pressure and the above-mentioned measured pressure is within a preset range, and the corresponding leak point depth is output.

[0033] In a third aspect, an electronic device is provided, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps corresponding to the method of the first aspect when executing the computer program.

[0034] In a fourth aspect, a computer-readable storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, the steps corresponding to the above method in the first aspect are implemented.

[0035] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0036] In the embodiment of the present invention, the leak point depth calculation model aims to associate the depth corresponding to the leak point with the wellhead pressure of the annular tubing, so as to calculate the wellhead pressure of the annular tubing at the corresponding depth. However, the formula obtained by association can only calculate the wellhead pressure corresponding to the specified leak point depth in the calculation. Therefore, a step-by-step accumulation method is adopted, and iteration is performed according to the step size; and the calculation result is judged by the actually measured wellhead pressure, so as to determine the leak point depth. In this way, the location of the leak point is located, and in the process of tubing maintenance, the leak point can be quickly found, thereby improving the maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 A flow chart of a method for obtaining a leak point of a gas injection string in a gas well provided by the present invention;

[0039] Figure 2 Schematic diagram of an annulus string and a gas injection string in the present invention;

[0040] Figure 3 It is a schematic diagram of conversion of leakage point depth of inclined well in the present invention;

[0041] Figure 4 A schematic diagram of the structure of a gas well gas injection string leakage point acquisition system provided by the present invention;

[0042] Figure 5 The present invention provides a schematic structural diagram of an electronic device.

[0043] Figure numerals: 1, annulus string; 11, annulus air column; 12, annulus liquid column; 2, gas injection string; 3, leak point location. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0047] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the term "setting" should be understood in a broad sense, for example, it can be a fixed setting, a detachable setting, or an integral setting; it can be a direct setting, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions and cannot be understood as indicating or implying relative importance.

[0048] It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, rather than limitations of the technical solutions of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments may be combined with each other.

[0049] The technical solution of the embodiment of the present invention is to solve the above technical problems, and the overall idea is as follows:

[0050] When a leak occurs in the gas injection string 2, the gas enters the annulus string 1, and the gas injection string 2 and the annulus string 1 are equivalent to a communicating vessel. According to the principle of communicating vessels, the calculation formulas for the depth, static pressure and gas injection wellhead pressure of the two are the same during the injection stop stage, based on which the annulus wellhead pressure can be calculated. However, the above formula can only calculate the annulus wellhead pressure corresponding to one depth value, so multiple heights in the string are used for calculation, and then the actual detected pressure value is used to judge the calculation result, so as to determine the location of the leak.

[0051] In an embodiment of the present invention, there is provided Figure 1 A method for obtaining a leak point of a gas injection string 2 in a gas well is shown, and the method comprises steps S101 to S102:

[0052] Step S101, in response to a leakage signal, measuring the measured pressure at the wellhead of the annulus string 1;

[0053] It should be noted that whether there is a leak in the gas injection string 2 (i.e., the oil pipe) is mainly to detect the pressure change in the annulus string 1. Because when there is no gas from the gas injection string 2 in the annulus string 1, its pressure change is small, mostly because the expansion of the gas injection string 2 during gas injection causes some squeezing of the annulus string 1. But there must be a leak. After the gas from the gas injection string 2 enters the annulus string 1, the two are equivalent to communicating vessels. The gas injection string 2 will continue to inject gas into the annulus string 1 to increase the pressure, thereby causing a large change in the pressure in the annulus string 1. Therefore, this embodiment adopts a pressure detection device set in the annulus gas column 11; when the pressure value of the detection device exceeds the preset threshold, the detection device is triggered to send a leakage signal. After receiving the leakage signal, the air pressure detection device set at the wellhead of the annulus string 1 is used to measure the actual pressure at the wellhead of the annulus string 1.

[0054] Step S102, calculating the leak depth according to the leak depth calculation model constructed in advance; the leak depth calculation model includes:

[0055] The first relationship between the wellhead pressure of the annulus string 1, the depth of the leak point, and the related parameters of the gas injection string 2;

[0056] First, the establishment of the first relationship is mainly based on the calculation formula of the depth of the gas injection string 2 during the stop injection stage, the static pressure corresponding to the depth, and the wellhead pressure of the gas injection string 2. The formula is an existing formula. The specific calculation process is as follows:

[0057] Known:

[0058]

[0059] Among them, p 注气h is the pressure at depth h of gas injection string 2 during the stop injection stage, p 注气井口 is the wellhead pressure of gas injection string 2, T 注气h is the temperature at depth h of the gas injection string 2, Z 注气h is the gas deviation coefficient at depth h of gas injection string 2, γ g is the relative density of the gas well.

[0060] Because when a leak occurs, the gas injection string 2 and the annulus string 1 are equivalent to communicating vessels, and the pressures of the two are equal at the same height position, so the two satisfy the following formula in the stable stage (i.e., the injection stop stage):

[0061]

[0062] Among them, p 环空h is the pressure at depth h of annulus string 1 during the stop injection phase, p 环空井口 is the wellhead pressure of annulus string 1, T 环空h is the temperature at depth h of the annulus column 1, Z 环空h is the gas deviation coefficient at depth h of the annulus string 1.

[0063] It should be noted that the gas deviation coefficient can be calculated from the pressure and temperature of the corresponding string position, and the temperature can be calculated according to the depth of the corresponding string position. The specific calculation formula is as follows:

[0064] Z 注气 h=f(p 注气 h,T 注气 h) (3)

[0065] T 注气 h=T 井口 +t*h (4)

[0066] Z 环空h=f(p 环空h ,T 环空 h) (5)

[0067] T 环空 h=T 井口 +t*h (6)

[0068] Where t is the geothermal gradient, T 井口 is the wellhead temperature. Existing formula.

[0069] It should be noted that the gas deviation coefficient Z 环空h The calculation formula f(p 环空h ,T 环空h ) is the existing formula. For details, please refer to the paper: Dong Meng. Comparison and Application of Natural Gas Compression Factor Calculation Methods [D]. Northeast Petroleum University, 2015. The compression factor in this paper is the gas deviation coefficient. Similarly, the gas deviation coefficient Z 注气h The calculations are also based on this paper.

[0070] Then, a second relationship is established between the depth of the gas injection string 2 and the step length. The second relationship is established because the above formula (2) can only calculate the wellhead pressure corresponding to a height value after substituting the known data, but the data is not necessarily the leak point location. Therefore, the step length is set to establish the second relationship in a step-by-step accumulation manner. Let the leak point height be h 漏 , in subsequent calculations h 漏 Substituting into h in formulas (1) to (6), the specific formula is as follows:

[0071] h 漏i =h 漏0 +(i)I (7)

[0072] Among them, h 漏i is the depth of the leak point in the pipe string after the i-th stacking, h 漏0 The first calculated leak depth of the tubing string, I is the step length, i = 1, 2, 3, 4...n.

[0073] The initial known parameters are brought into the first relationship and the second relationship, the leak depth is gradually accumulated based on the step size, and the wellhead pressure of the annulus string 1 is calculated according to the accumulated leak depth until the difference between the wellhead pressure of the annulus string 1 and the measured pressure is within the preset range, and the corresponding leak depth is output.

[0074] It should be noted that the initial known parameters include: wellhead pressure of gas injection string 2, wellhead temperature, and relative density of the gas well. First, substitute these known parameters into formulas (2) to (6) to obtain the initial depth value. Using this initial depth value, gradually accumulate the leak depth based on the step length to calculate the wellhead pressure of annulus string 1 corresponding to different depths, which is equivalent to calculating each position separated by a step length from the top of the string downward. Finally, compare the calculated result with the measured pressure. If the error is within the preset range, it is considered that the depth value used at this time is the leak depth. Otherwise, continue to accumulate the depth value. The specific calculation process is as follows:

[0075] Assume the depth of the leak point is h 漏 , the initial leak depth is h 漏0 , the depth of the leak point in the pipe string after the i-th stacking is j 漏i Since the initial wellhead pressure of gas injection string 2 is p 注气井口 , wellhead temperature T 井口 and gas well relative density γ g is known, and we can substitute it into formulas (2) to (6) to obtain:

[0076]

[0077] Therefore, the initial leak depth h 漏0 , reverse calculation to obtain the initial wellhead pressure of annulus string 1 At this time, compare it with the measured value p of the wellhead of annulus string 1 环空井口实测 contrast.

[0078] like ε is the error value, set to 0.01Mpa, then h 漏0 is the leak depth. Otherwise, the leak depth is gradually accumulated based on the step length. The specific calculation process is as follows:

[0079] Because there are both gas and liquid in the annulus string 1, the calculations for the annulus string 1 containing different media are performed separately, such as Figure 2 As shown. Assume that the depth of the annular air column 11 is h 环空气柱 , the depth of the annular liquid column 12 is h 环空液柱 ,h 环空气柱 and h 环空液柱 The depth values ​​are known.

[0080] As the leak point positions accumulate, when h 漏i ≤h 环空气柱 When h is , that is, the leak point is within the range of the annular air column 11 (i.e., the first range), the pressure at the leak point of the empty pipe column is equal to the pressure at the leak point in the annular air column 11, as shown in (8). 漏i >h 环空气柱When the leak point is within the range of the annular liquid column 12 (i.e., the second range), the pressure at the leak point of the annular string 1 is equal to the sum of the pressures of the annular gas column 11 and the annular liquid column 12 at the leak point. The specific calculation formula is as follows:

[0081]

[0082] Among them, p 环空h漏i is the pressure at the leak point after i stacking in the annulus string 1, ρ 液 is the density of the liquid column in the annulus.

[0083] Based on the principle of communicating vessels, we can get:

[0084]

[0085] Based on formula (10) and the known parameters, the wellhead pressure of annulus string 1 after the i-th depth accumulation is obtained: Compare it with the measured value p of the wellhead of annulus string 1 环空井口实测 contrast.

[0086] like Then determine h 漏i is the depth of the leak point; otherwise, continue to accumulate the depth and obtain the corresponding annulus string 1 wellhead pressure until a satisfactory This determination requires the wellhead pressure of the annulus string 1 to be reached. This allows the location of the leak to be located, and during the string maintenance process, the leak can be found quickly, improving maintenance efficiency.

[0087] It should also be noted that the above embodiment is for the case where the gas well is a vertical well. When the gas well is an inclined well, the depth of the leak point is equal to the projection depth of the inclined well in the vertical direction. Figure 3 The leak point is shown as 3. That is:

[0088]

[0089] Among them, h 漏 is the height of the leak point, h 漏斜 is the length corresponding to the inclined shaft, and a is the angle between the inclined shaft and the vertical direction.

[0090] In some embodiments of the present invention, after calculating the depth of the leak point, the size of the leak point may also be calculated to estimate the leakage amount, so the leak point acquisition method further includes:

[0091] The leak size is calculated according to a leak size calculation model constructed in advance; the leak size calculation model includes: a third relationship among the pressure of the annulus string 1 at the leak point, the pressure of the gas injection string 2, the gas leakage volume and the string size; a fourth relationship among the leak inner diameter at the leak point, the gas leakage volume, the pressure of the annulus string 1 and the pressure of the gas injection string 2; after substituting the third relationship and the fourth relationship into the leak depth, the inner diameter of the leak is obtained.

[0092] It should be noted that when establishing the first relationship, the formula for the depth and pressure of the gas injection string 2 during the gas injection phase is required, as follows:

[0093] Known:

[0094]

[0095] Among them, q 注入 is the amount of gas injected, D 注气内 is the inner diameter of the gas injection string 2.

[0096] Because there are both gas and liquid in the annulus column 1, the calculations for the annulus columns 1 containing different media are performed separately. The depth of the annulus column 11 is h 环空气柱 , the depth of the annular liquid column 12 is h 环空液柱 ,h 环空气柱 and h 环空液柱 The depth values ​​are all known. Assume that the gas leakage from the leak point 2 of the gas injection string to the annulus is q 漏 , calculate the depth of the leakage point in the annulus h 漏 The pressure at p 环空h漏 The process is as follows:

[0097] When h 漏 ≤h 环空气柱 When the leak point is located within the range of the annular air column 11 (i.e., the first range),

[0098]

[0099] Because the leak depth h 漏 Leakage volume q 漏 and (p 环空h漏 / p 注气h漏 ) is:

[0100]

[0101] Where k is the gas adiabatic index and d is the inner diameter of the leak.

[0102] Substitute the calculated leak point depth into formulas (12) and (13) to calculate the inner diameter of the leak point.

[0103] When h 漏 >h环空气柱 hour,

[0104]

[0105] Substitute the calculated leak depth into formulas (13) and (14) to obtain the inner diameter of the leak. This enables the location and size of the leak to be acquired, further providing a reference for oil pipe maintenance and improving the convenience of maintenance.

[0106] Based on the same inventive concept, Figure 4 As shown, an embodiment of the present invention provides a gas well gas injection string leakage point acquisition system, comprising:

[0107] The detection module 201 measures the measured pressure at the wellhead of the annulus string 1 in response to the leakage signal;

[0108] The calculation module 202 is used to calculate the leak depth according to a leak depth calculation model constructed in advance; the leak depth calculation model includes: a first relationship between the wellhead pressure of the annulus string 1, the leak depth, and related parameters of the gas injection string 2; a second relationship in which the depth of the gas injection string 2 changes with the step size; the initial known parameters are brought into the first relationship and the second relationship, the leak depth is gradually accumulated based on the step size, and the wellhead pressure of the annulus string 1 is calculated according to the accumulated leak depth, until the difference between the wellhead pressure of the annulus string 1 and the measured pressure is within a preset range, and the corresponding leak depth is output.

[0109] Based on the same inventive concept, an embodiment of the present invention provides an electronic device, such as Figure 5 As shown, it includes: a memory 302, a processor 301, and a computer program stored in the memory 302 and executable on the processor 301. When the processor 301 executes the computer program, the above-mentioned gas well gas injection string leakage point acquisition method is implemented.

[0110] Based on the same inventive concept, this embodiment provides a computer-readable storage medium on which a computer program is stored, characterized in that when the program is executed by a processor, the above-mentioned method for obtaining the leakage point of the gas injection string 2 of the gas well is implemented.

[0111] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0112] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0113] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for obtaining leakage points of gas injection pipe strings in gas wells, characterized in that: The method comprises: In response to the leakage signal, measuring the measured pressure at the wellhead of the annulus string; The leak depth is calculated according to a leak depth calculation model constructed in advance; the leak depth calculation model includes: A first relationship between the wellhead pressure of the annulus string, the depth of the leak point, and the parameters related to the gas injection string; a second relationship between the depth of the gas injection string and the step length; The initial known parameters are brought into the first relationship and the second relationship, the leak depth is gradually accumulated based on the step size, the annulus string wellhead pressure is calculated according to the accumulated leak depth, until the difference between the annulus string wellhead pressure and the measured pressure is within a preset range, and the corresponding leak depth is output.

2. The method according to claim 1, characterized in that The step of calculating the wellhead pressure of the annular column according to the accumulated leakage point depth specifically includes: Obtaining a first depth of the annular air column; When the leak point is within the first depth range, the pressure at the leak point of the annulus pipe string is equal to the pressure at the leak point in the annulus air column.

3. The method according to any one of claim 2, characterized in that The step of calculating the wellhead pressure of the annular column according to the accumulated leakage point depth specifically includes: Obtain a second depth of the annular liquid column; When the leak point is within the second depth range, the pressure at the leak point of the annulus string is equal to the sum of the pressures of the annulus gas column and the annulus liquid column at the leak point.

4. The method according to claim 3, characterized in that After the outputting of the corresponding leak depth, the method further includes: The leak size is calculated according to a leak size calculation model constructed in advance; the leak size calculation model includes: A third relationship among the pressure of the annular string at the leakage point, the pressure of the gas injection string, the gas leakage amount and the string size; A fourth relationship between the inner diameter of the leak point, the gas leakage volume, the annulus string pressure and the gas injection string pressure at the leak point; After substituting the third relationship and the fourth relationship into the leak point depth, the inner diameter of the leak point is obtained.

5. The method according to claim 4, when calculating the pressure of the annular column at the leak point, is characterized in that: When the leak point is within the first depth range, the pressure at the leak point of the annulus pipe string is equal to the pressure at the leak point in the annulus air column; When the leak point is within the second depth range, the pressure at the leak point of the annulus string is equal to the sum of the pressures of the annulus gas column and the annulus liquid column at the leak point.

6. The method according to any one of claims 1 to 5, characterized in that: The method further comprises: When the gas well is a deviated well, The depth of the leakage point is equal to the projection depth of the inclined well in the vertical direction.

7. The method according to any one of claims 1 to 5, characterized in that: Before responding to the leakage signal, the method specifically includes: A pressure detection device is provided in the annular air column; When the pressure value of the detection device exceeds a preset threshold, the detection device is triggered to send a leakage signal.

8. A gas well gas injection string leak point acquisition system, characterized in that: The system comprises: The detection module measures the measured pressure of the annulus string wellhead in response to the leakage signal; A calculation module is used to calculate the leak depth according to a leak depth calculation model constructed in advance; the leak depth calculation model includes: a first relationship between the wellhead pressure of the annulus string, the leak depth, and related parameters of the gas injection string; a second relationship in which the depth of the gas injection string changes with the step size; initial known parameters are brought into the first relationship and the second relationship, the leak depth is gradually accumulated based on the step size, and the wellhead pressure of the annulus string is calculated according to the accumulated leak depth, until the difference between the wellhead pressure of the annulus string and the measured pressure is within a preset range, and the corresponding leak depth is output.

9. An electronic device, characterized in that: The electronic device comprises: a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor implements the method steps described in any one of claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps corresponding to the method according to any one of claims 1 to 7 are implemented.

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