Method and device for identifying abnormal production state of coal bed gas concealed well

Abstract

The application discloses a kind of coal bed gas concealed abnormal well production state identification method and device, belong to coal bed gas development technical field.The method includes: obtaining multiple production index parameters of target coal bed gas well;Obtain the production data corresponding to each production index parameter;According to production data, the actual fluctuation value of each production index parameter is calculated;Determine whether the actual fluctuation value of each production index parameter is in the preset concealed abnormal fluctuation range corresponding to each production index parameter;When the actual fluctuation value of at least one production index parameter is in the preset concealed abnormal fluctuation range of each production index parameter corresponding thereto, then determine that the current target coal bed gas well is in concealed abnormal well production state.Using this method can identify the concealed abnormal stage of coal bed gas well in time, to make good prevention and control measures in advance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coalbed methane development, and particularly relates to a method and device for identifying the production state of a concealed abnormal coalbed methane well. BACKGROUND

[0002] In the process of coalbed methane development, continuous drainage and pressure reduction are needed to reduce the pressure of the coal reservoir to below the desorption pressure of the coal reservoir, so that the methane molecules adsorbed on the surface of the coal matrix are desorbed, diffuse, and then flow out. Because the coal reservoir has strong water sensitivity, velocity sensitivity, and pressure sensitivity, therefore, it is very important to ensure the continuous production of gas and water for coalbed methane development. However, due to the limitations of actual conditions, the coalbed methane well may be in an abnormal production state due to various non-geological factors, and then problems such as interruption of drainage and production, abnormal production of single well, and large decrease in gas production and water production may occur. If these problems cannot be timely treated and solved, serious consequences such as reservoir damage, reduced permeability, decreased single-well productivity, and even no gas production may occur. At the same time, the treatment of the coalbed methane well in an abnormal state requires a large amount of manpower, material resources, and financial resources, and a large amount of gas is lost during the treatment period. Therefore, the comprehensive influence on low-cost coalbed methane development cannot be ignored, and therefore it is particularly important for each coalbed methane development enterprise to research a method for efficiently and comprehensively treating the abnormal coalbed methane well.

[0003] In the related art, the current abnormal phenomenon is analyzed and the cause of the abnormality is obtained when the coalbed methane well is already in an abnormal state.

[0004] Because the related art actually analyzes and explains the cause of the coalbed methane well that is already in an abnormal production state, rather than predicting the abnormal phenomenon of the coalbed methane well and taking preventive measures in advance, therefore, this has little guiding significance for ensuring the smooth production of the coalbed methane well. SUMMARY

[0005] Therefore, the present application provides a method and device for identifying the production state of a concealed abnormal coalbed methane well, which can timely identify the concealed abnormal stage of the coalbed methane well to take preventive measures in advance.

[0006] Specifically, the technical solutions include the following.

[0007] On one hand, the present application provides a method for identifying the production state of a concealed abnormal coalbed methane well, and the method includes the following steps.

[0008] Obtaining a plurality of production index parameters of a target coalbed methane well;

[0009] Obtaining production data corresponding to each of the production index parameters;

[0010] calculating an actual fluctuation value of each of the production index parameters according to the production data;

[0011] determining whether the actual fluctuation value of each of the production index parameters is within a preset concealed abnormal fluctuation range corresponding to each of the production index parameters;

[0012] when the actual fluctuation value of at least one of the production index parameters is within the preset concealed abnormal fluctuation range corresponding to the production index parameter, it is determined that the target coalbed gas well is in a concealed abnormal well production state.

[0013] Optionally, the plurality of production index parameters include pressure index parameters, gas-water index parameters, and working condition parameters.

[0014] Optionally, after determining that the target coalbed gas well is in a concealed abnormal well production state, a reason for the concealed abnormal well is determined and displayed according to the production index parameter within the preset concealed abnormal fluctuation range and a concealed abnormal well fault table.

[0015] The concealed abnormal well fault table includes each of the production index parameters and at least one reason corresponding to each of the production index parameters.

[0016] Optionally, the pressure index parameters include flow pressure and pipe pressure.

[0017] The preset concealed abnormal fluctuation range of the flow pressure is ± (0.01-0.02) MPa.

[0018] The preset concealed abnormal fluctuation range of the pipe pressure is ± (0.002-0.005) MPa.

[0019] Optionally, the gas-water index parameter is a gas-water floating ratio.

[0020] The preset concealed abnormal fluctuation range of the gas-water floating ratio is 100-400.

[0021] Optionally, a formula for calculating the gas-water floating ratio is as follows:

[0022] S = △gas / △water

[0023] wherein S is the gas-water floating ratio, △gas is a gas quantity change amplitude, and △water is a water quantity change amplitude. 3 3 .

[0024] Optionally, the working condition parameters include a dynamometer card and a coalbed degree.

[0025] ​The preset concealed abnormal fluctuation range of the indicator diagram is ΔT=10%~20%, wherein ΔT is an area reduction of the indicator diagram.

[0026] The preset concealed abnormal fluctuation range of the coal bed degree is ΔH=5~20, wherein ΔH is a change of the coal bed degree, and the unit is meter.

[0027] In another aspect, the embodiment of the present application provides a device for identifying a production state of a concealed abnormal well of coal bed gas, and the device comprises:

[0028] A first obtaining module is configured to obtain a plurality of production index parameters of a target coal bed gas well.

[0029] A second obtaining module is configured to obtain production data corresponding to each of the production index parameters.

[0030] A first calculating module is configured to calculate an actual fluctuation value of each of the production index parameters according to the production data.

[0031] A first determining module is configured to determine whether the actual fluctuation value of each of the production index parameters is within a preset concealed abnormal fluctuation range of each of the production index parameters.

[0032] A determining module is configured to determine that the target coal bed gas well is in a concealed abnormal well production state when the actual fluctuation value of at least one of the production index parameters is within the preset concealed abnormal fluctuation range of each of the production index parameters corresponding to the at least one of the production index parameters.

[0033] Optionally, the device further comprises a second determining module configured to determine and display a reason for the concealed abnormal well according to a production index parameter within the preset concealed abnormal fluctuation range and a concealed abnormal well fault table after determining that the target coal bed gas well is in the concealed abnormal well production state.

[0034] The concealed abnormal well fault table comprises each of the production index parameters and at least one reason corresponding to each of the production index parameters.

[0035] Optionally, the device further comprises a second calculating module configured to calculate a gas-water fluctuation ratio according to the following formula:

[0036] S=Δgas / Δwater

[0037] wherein S is the gas-water fluctuation ratio, Δgas is a change amplitude of gas, and the unit is m 3 ; Δwater is a change amplitude of water, and the unit is m 3 .

[0038] The technical scheme provided by the embodiment of the present application has at least the following beneficial effects:

[0039] Based on the collected production data of each production index parameter of the target coalbed methane well, the actual fluctuation value of each production index parameter is calculated, and compared with the preset concealed abnormal fluctuation range of each production index parameter, so as to determine whether the target coalbed methane well is in a concealed abnormal well production state, and then the causes determined according to the concealed abnormal fault table are targetedly treated. Since the concealed abnormal stage of the coalbed methane well can be identified in time, the abnormal phenomenon of the coalbed methane well is avoided, which has great guiding significance for ensuring the smooth production of the coalbed methane well. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0041] Figure 1 The flow chart of the coalbed methane concealed abnormal well production state identification method provided by the embodiments of the present application.

[0042] Figure 2 The module block diagram of the coalbed methane concealed abnormal well production state identification device provided by the embodiments of the present application.

[0043] The above drawings have shown the specific embodiments of the present application, which will be described in more detail hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application by any means, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0045] Unless otherwise defined, all technical terms used in the embodiments of the present application have the same meanings as generally understood by those skilled in the art. Before the embodiments of the application are further described in detail, the terms for understanding the embodiments of the present application are explained.

[0046] The concealed abnormal well production state refers to a production state between the normal production state and the abnormal production state of the coalbed methane well.

[0047] In order to make the technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0048] In combination with Figure 1 As shown in the drawings, the present application provides a coalbed methane concealed abnormal well production state identification method, which comprises the following steps:

[0049] S101: Obtain a plurality of production index parameters of a target coalbed methane well.

[0050] S102: Obtain production data corresponding to each production index parameter.

[0051] S103: Calculate the actual fluctuation value of each production index parameter according to the production data.

[0052] S104: Determine whether the actual fluctuation value of each production index parameter is within the preset concealed abnormal fluctuation range of each production index parameter.

[0053] S105: When the actual fluctuation value of at least one production index parameter is within the preset concealed abnormal fluctuation range of the corresponding production index parameter, it is determined that the current target coalbed methane well is in a concealed abnormal well production state.

[0054] It can be understood that coalbed methane refers to gas resources associated with coal, that is, hydrocarbon gases stored in coal seams, mainly composed of methane, and belongs to unconventional natural gas. Coalbed methane is a hydrocarbon gas mainly adsorbed on the surface of coal matrix particles, partially free in coal pores or dissolved in coal seam water, and is a by-product of coal.

[0055] Based on the collected production data corresponding to a plurality of production index parameters of a target coalbed methane well, the actual fluctuation value of each production index parameter is calculated and compared with the preset concealed abnormal fluctuation range of each corresponding production index parameter, so as to determine whether the target coalbed methane well is in a concealed abnormal well production state, and then the causes determined according to the concealed abnormal fault table are targeted for management. Since the concealed abnormal stage of the coalbed methane well can be identified in time, the abnormal phenomenon of the coalbed methane well is avoided, which has great guiding significance for ensuring the smooth production of the coalbed methane well.

[0056] The coalbed methane concealed abnormal well production state identification method provided by the present embodiment will be described in more detail below.

[0057] In some embodiments of the present application, the plurality of production index parameters include pressure index parameters, gas-water index parameters and working condition parameters.

[0058] In some embodiments of the present application, after determining that the current target coalbed methane well is in the hidden abnormal well production state, the hidden abnormal well reason is determined and displayed according to the production index parameter in the preset hidden abnormal fluctuation range and the hidden abnormal well fault table. The hidden abnormal well fault table includes each production index parameter and at least one corresponding reason for each production index parameter.

[0059] In some embodiments of the present application, the pressure index parameter includes flow pressure and pipe pressure.

[0060] The preset hidden abnormal fluctuation range of the flow pressure is ±(0.01-0.02) MPa, and the preset hidden abnormal fluctuation range of the pipe pressure is ±(0.002-0.005) MPa.

[0061] It should be noted that the flow pressure refers to the pressure of the target layer measured during the production of the coalbed methane well, the target layer is generally the middle position of the gas layer, called flow pressure, also called bottom hole pressure, and simply referred to as flow pressure. The flow pressure can be measured by a pressure gauge.

[0062] It should be noted that the pipe pressure refers to the gas pressure in the ground pipeline during the production of the coalbed methane well. The pipe pressure can be measured by a pressure gauge.

[0063] In some embodiments of the present application, the gas-water index parameter is a gas-water floating ratio, and the preset hidden abnormal fluctuation range of the gas-water floating ratio is 100-400.

[0064] In some embodiments of the present application, the formula for calculating the gas-water floating ratio is as follows:

[0065] S=△gas / △water

[0066] Wherein, S is the gas-water floating ratio, △gas is the gas quantity change amplitude, the unit is m 3 , and △water is the water quantity change amplitude, the unit is m 3 .

[0067] It should be noted that the gas quantity can be calculated according to the instantaneous flow meter reading in the ground gas pipeline. Specifically, the instantaneous flow meter reading in the ground pipeline is first read, and then multiplied by 24 hours, and the obtained value is the gas quantity value.

[0068] It should be noted that the water quantity can be measured by a measuring cup at the outlet of the ground water pipeline.

[0069] In some embodiments of the present application, the working condition parameter includes a dynamometer card and a coal rank.

[0070] The preset hidden abnormal fluctuation range of the dynamometer card is △T=10%-20%, wherein △T is the area reduction of the dynamometer card.

[0071] The preset concealed abnormal fluctuation range of the coal submergence degree is ΔH=5-20, wherein ΔH is the variation of the coal submergence degree, and the unit is meter.

[0072] It should be noted that the preset concealed abnormal fluctuation range of the indicator diagram is for the coalbed methane well with low water production, and the daily water production of the coalbed methane well of this type is 10m 3 If the coalbed methane well is a coalbed methane well with high water production, the preset concealed abnormal fluctuation range of the indicator diagram needs to be adjusted according to the actual working condition.

[0073] It can be understood that the load tension borne by the polished rod suspending point and the displacement of the suspending point relative to the wellhead are measured on site by the indicator diagram testing instrument, dozens to hundreds of data points are measured in one stroke, the closed curve diagram composed of the load-displacement change relation curve drawn by one complete stroke is the indicator diagram, and the area of the indicator diagram is the area surrounded by the closed curve in the closed curve diagram. The indicator diagram is used to reflect the working condition of the pump. The coal submergence degree refers to the distance between the liquid level and the depth at which the pressure gauge for measuring the flow pressure is located.

[0074] The flow pressure and the pipe pressure can be directly obtained by transmitting the data to the indoor equipment respectively; the gas quantity value can be obtained by transmitting the data to the indoor equipment and calculating; the water quantity value can be obtained by measuring on site and calculating; and the indicator diagram can be directly measured on site by the indicator diagram testing instrument.

[0075] The coal submergence degree can be obtained by subtracting the casing pressure measured by the wellhead pressure gauge from the flow pressure measured by the downhole pressure gauge, and then converting the pressure difference and the depth, that is, according to 1MPa≈100m to obtain the final coal submergence degree; or the coal submergence degree can be obtained by measuring the dynamic liquid level at the wellhead by manual operation, and subtracting the target layer vertical depth of the target coalbed methane well from the dynamic liquid level.

[0076] In some embodiments of the present application, when the actual fluctuation value of at least one parameter of the flow pressure, the pipe pressure, the gas-water floating ratio, the indicator diagram and the coal submergence degree is in the preset concealed abnormal fluctuation range of the corresponding production index parameter, it is determined that the target coalbed methane well is in the concealed abnormal well production state, and the reason for the concealed abnormal well is determined and displayed to the operator according to the production index parameter in the preset concealed abnormal fluctuation range and the concealed abnormal fault table shown in the following table.

[0077]

[0078] For example, when the pressure index parameter is in the preset concealed abnormal fluctuation range, and the gas-water index parameter and the working condition parameter are not in the preset concealed abnormal fluctuation range, the reason for the concealed abnormal well is determined and displayed according to the concealed abnormal fault table, and the reason for the concealed abnormal well may be a pressure gauge fault, a pump fault, fluctuation of the gathering and transportation system pressure, water accumulation in the pipeline, or a pipeline leakage point, and then the reasons for the above-mentioned concealed abnormal wells are checked one by one and targeted treatment is performed.

[0079] When the gas-water index parameter is in the preset concealed abnormal fluctuation range, and the pressure index parameter and the working condition parameter are not in the preset concealed abnormal fluctuation range, the reason for the concealed abnormal well is determined and displayed according to the concealed abnormal fault table, and the reason for the concealed abnormal well may be a pressure gauge fault, a pump fault, or a pipe rod (oil pipe, sucker rod) structure damage, and then the reasons for the above-mentioned concealed abnormal wells are checked one by one and targeted treatment is performed.

[0080] When the working condition parameter, the pressure index parameter and the gas-water index parameter are in the preset concealed abnormal fluctuation range, the reason for the concealed abnormal well is determined and displayed according to the concealed abnormal fault table, and the reason for the concealed abnormal well may be a pressure gauge fault, a pump fault, fluctuation of the gathering and transportation system pressure, water accumulation in the pipeline, a pipeline leakage point, or a pipe rod (oil pipe, sucker rod) structure damage, and then the reasons for the above-mentioned concealed abnormal wells are checked one by one and targeted treatment is performed.

[0081] The above is only three cases, and there are many other cases, which are not listed one by one.

[0082] It should be noted that the pressure index parameter in the preset concealed abnormal fluctuation range includes: the flow pressure is in the corresponding flow pressure preset concealed abnormal fluctuation range, and the pipe pressure is not in the corresponding pipe pressure preset concealed abnormal fluctuation range; or the pipe pressure is in the corresponding pipe pressure preset concealed abnormal fluctuation range, and the flow pressure is not in the corresponding flow pressure preset concealed abnormal fluctuation range; or the flow pressure and the pipe pressure are respectively in the corresponding preset concealed abnormal fluctuation range. The working condition parameter in the preset concealed abnormal fluctuation range includes: the dynamometer card is in the corresponding dynamometer card preset concealed abnormal fluctuation range, and the coal bed degree is not in the corresponding coal bed degree preset concealed abnormal fluctuation range; or the dynamometer card is in the corresponding coal bed degree preset concealed abnormal fluctuation range, and the dynamometer card is not in the corresponding flow pressure preset concealed abnormal fluctuation range; or the dynamometer card and the coal bed degree are respectively in the corresponding preset concealed abnormal fluctuation range.

[0083] That is, when it is determined that at least one parameter in the concealed abnormal well production index parameter is in the value in the preset abnormal fluctuation range, the reason of the concealed abnormal well is determined according to the determination result and the concealed abnormal fault table, and the reason is checked one by one and targetedly treated, so that the fault can be determined and treated in time when the well is in the concealed abnormal stage.

[0084] In conclusion, since the coal seam gas concealed abnormal well production state identification method provided by the embodiment of the application is based on the production data corresponding to the plurality of production index parameters of the target coal seam gas well, the actual fluctuation value of each production index parameter is calculated, and compared with the preset concealed abnormal fluctuation range of each corresponding production index parameter, so as to determine whether the target coal seam gas well is in the concealed abnormal well production state, and thus the reason determined according to the concealed abnormal fault table can be treated in a targeted manner. Since the concealed abnormal stage of the coal seam gas well can be identified in time, the abnormal phenomenon of the coal seam gas well is avoided, and the smooth production of the coal seam gas well is ensured, which has great guiding significance.

[0085] On the other hand, the embodiment of the application further provides a coal seam gas concealed abnormal well production state identification device, which comprises:

[0086] The first acquisition module 201 is configured to acquire a plurality of production index parameters of a target coal seam gas well.

[0087] The second acquisition module 202 is configured to acquire production data corresponding to each production index parameter.

[0088] The first calculation module 203 is configured to calculate an actual fluctuation value of each production index parameter according to the production data.

[0089] The first determination module 204 is configured to determine whether the actual fluctuation value of each production index parameter is in the preset concealed abnormal fluctuation range of each production index parameter.

[0090] The determination module 205 is configured to determine that the current target coal seam gas well is in the concealed abnormal well production state when the actual fluctuation value of at least one production index parameter is in the preset concealed abnormal fluctuation range of each corresponding production index parameter.

[0091] In some embodiments of the application, the plurality of production index parameters comprises a pressure index parameter, a gas-water index parameter and a working condition parameter.

[0092] In some embodiments of the present application, the device further comprises a second determining module configured to determine and display the reason for the hidden abnormal well after determining that the current target coalbed methane well is in the hidden abnormal well production state according to the production index parameter within the preset hidden abnormal fluctuation range and the hidden abnormal well fault table; wherein the hidden abnormal well fault table comprises each production index parameter and at least one corresponding reason for each production index parameter.

[0093] In some embodiments of the present application, the device further comprises a second calculating module configured to calculate the gas-water floatation ratio according to the following formula:

[0094] S = Δgas / Δwater

[0095] wherein S is the gas-water floatation ratio; Δgas is the gas quantity change amplitude, the unit is m 3 ; and Δwater is the water quantity change amplitude, the unit is m 3 .

[0096] Since the hidden abnormal well state identification device provided by the embodiments of the present application is based on the production data corresponding to each production index parameter of the target coalbed methane well, the actual fluctuation value of each production index parameter is calculated, and each production index parameter is compared with the corresponding preset hidden abnormal fluctuation range, thereby determining whether the target coalbed methane well is in the hidden abnormal well production state, and then the reason determined according to the hidden abnormal fault table is targetedly treated. Since the hidden abnormal stage of the coalbed methane well can be identified in time, the abnormal phenomenon of the coalbed methane well is avoided, which has great guiding significance for ensuring the smooth production of the coalbed methane well.

[0097] In order to better illustrate and verify the method of the present application, the following takes two coalbed methane wells as examples for illustration.

[0098] The first coalbed methane well embodiment is as follows:

[0099] A drainage well in a certain block is selected, the well has been in a development state, the depth of the coalbed is 640.6-646.6m, and the thickness of the coalbed is 5.7m. Since the well has been put into production, it has been continuously drained for 6 years, and is currently in a decline period. From the production trend, with the gradual decrease of the pressure, the gas quantity shows a downward trend, from the stable production gas quantity 2500m 3 , slowly decreases to the current 1500m 3 , the water quantity is in a low liquid production state for a long time, and each pressure parameter is relatively stable from the comprehensive curve. The following begins to identify the hidden abnormal production state of the coalbed methane well:

[0100] (1) Obtain the pressure index parameters, gas and water index parameters and working condition parameters of the coalbed methane well, that is, obtain the production data of the flow pressure, pipe pressure, gas volume, water volume, dynamometer card and coal seam degree of the coalbed methane well.

[0101] (2) After calculation, the pipe pressure of the coalbed methane well rises from 0.025 MPa to 0.03 MPa, increases by 0.005 MPa, is in the preset concealed abnormal fluctuation range of pipe pressure; the gas and water floating ratio is 260, is in the preset concealed abnormal fluctuation range of gas and water floating ratio; the dynamometer card area decreases by 19%, is in the preset concealed abnormal fluctuation range of dynamometer card area. The values of flow pressure and coal seam degree are in stable state, are in the normal fluctuation range of coalbed methane well.

[0102] (3) According to the above determination result and the concealed abnormal fault table, it is determined and displayed that the possible reason for the concealed abnormality of the coalbed methane well is pressure gauge failure, pump failure, fluctuation of gathering system pressure impacting single well to cause fluctuation illusion, water accumulation in pipeline, leakage point in pipeline or structure damage of pipe rod (oil pipe, pumping rod), and after checking the above multiple reasons one by one, it is determined that the pump has a failure.

[0103] (4) After targeted treatment of the pump, the gas volume of the coalbed methane well is restored to 2000m 3 from 1500m 3 , and remains stable.

[0104] The implementation example of the second coalbed methane well is as follows:

[0105] Select another drainage well in a certain block, the coal seam depth of the well is 734.8-741.05m, and the thickness of the coal seam is 6.25m. The well has been continuously drained for 3 years since it was put into production. From the production trend, the well maintains stable gas volume by continuously releasing pressure, but the gas volume is in a fluctuating stable state, that is, when the production is increased, the gas volume is in an increasing state; when the production is not increased, the gas volume is in a decreasing state, and the water volume is also in a decreasing state. The following begins to identify the concealed abnormal production state of the coalbed methane well:

[0106] (1) Obtain the pressure index parameters, gas and water index parameters and working condition parameters of the coalbed methane well, that is, obtain the production data of the flow pressure, pipe pressure, gas volume, water volume, dynamometer card and coal seam degree of the coalbed methane well.

[0107] (2) After calculation, the dynamometer card area of the coalbed methane well decreases by 20%, is in the preset concealed abnormal fluctuation range of dynamometer card area. The values of flow pressure, pipe pressure, gas volume, water volume and coal seam degree are in stable state, are in the normal fluctuation range of coalbed methane well.

[0108] (3) According to the above determination result, and the hidden abnormal fault table, it is determined and displayed that the hidden abnormal reason of the coalbed gas well is probably pump failure or pipe rod (tubing, sucker rod) structure damage, and after checking the above two reasons one by one, it is determined that the pump has failure.

[0109] (4) After targeted treatment of the pump, the stable production capacity of the coalbed gas well is enhanced, and the daily gas production increase is 200m 3 .

[0110] Those of ordinary skill in the art can understand that all or part of the steps or modules of the above-mentioned embodiments can be applied in or executed by a computer, for example, by hardware, or by a program instructing related hardware, and the program can be stored in a non-transitory computer readable storage medium, such as a read-only memory, a magnetic disk or an optical disk.

[0111] In this application, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. The term "a plurality of" refers to two or more, unless otherwise explicitly limited.

[0112] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. The specification and examples given are intended as illustrative only and not limiting of the present application. The scope of the application is to be limited only by the appended claims.

[0113] It should be understood that the application is not limited to the precise construction that has been described above and shown in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is limited only by the appended claims.

Claims

1. A method for identifying the production status of concealed abnormal coalbed methane wells, characterized in that, The method includes: Multiple production index parameters of the target coalbed methane well are obtained. These parameters include pressure parameters, gas-water parameters, and operating condition parameters. The pressure parameters include flowing pressure and pipe pressure, where flowing pressure refers to the pressure of the target layer measured during coalbed methane well production. The gas-water parameter is the gas-water fluctuation ratio. The operating condition parameters include the dynamometer card and coal slack. The preset hidden abnormal fluctuation range for the flowing pressure is ±(0.01~0.02)MPa; the preset hidden abnormal fluctuation range for the pipe pressure is ±(0.002~0.005)MPa; the preset hidden abnormal fluctuation range for the gas-water fluctuation ratio is 100~400; the preset hidden abnormal fluctuation range for the dynamometer card is ΔT=10%~20%, where ΔT is the reduction in the area of ​​the dynamometer card; and the preset hidden abnormal fluctuation range for the coal slack is ΔH=5~20, where ΔH is the change in coal slack in meters. The formula for calculating the air-water float ratio is as follows: S = Δgas / Δwater Wherein, S is the gas-water floating ratio; Δgas is the gas volume change range, in m3; Δwater is the water volume change range, in m3. Obtain the production data corresponding to each of the aforementioned production indicator parameters; The actual fluctuation value of each of the production indicator parameters is calculated based on the production data. Determine whether the actual fluctuation value of each of the production indicator parameters is within the preset hidden abnormal fluctuation range corresponding to each of the production indicator parameters; When the actual fluctuation value of at least one of the production indicator parameters is within the preset hidden abnormal fluctuation range of the corresponding production indicator parameter, it is determined that the current target coalbed methane well is in a hidden abnormal well production state. When the pressure index parameter is within the preset hidden abnormal fluctuation range, and the gas-water index parameter and operating condition parameter are not within the preset hidden abnormal fluctuation range, the cause of the hidden abnormal well is determined and displayed according to the hidden abnormal fault table as a pressure gauge failure, pump failure, pressure fluctuation in the gathering and transportation system causing an impact on a single well resulting in a false fluctuation, water accumulation in the pipeline, or a leak in the pipeline. The pressure index parameter being within the preset hidden abnormal fluctuation range includes: the flowing pressure being within the corresponding preset hidden abnormal fluctuation range, but the pipe pressure not being within the corresponding preset hidden abnormal fluctuation range; or the pipe pressure being within the corresponding preset hidden abnormal fluctuation range, but the flowing pressure not being within the corresponding preset hidden abnormal fluctuation range; or both the flowing pressure and the pipe pressure being within their respective preset hidden abnormal fluctuation ranges.

2. The method according to claim 1, characterized in that, After determining that the target coalbed methane well is in a hidden abnormal production state, the cause of the hidden abnormal well is determined and displayed based on the production index parameters within the preset hidden abnormal fluctuation range and the hidden abnormal well fault table. The hidden abnormal well fault table includes each of the production index parameters and at least one cause corresponding to each of the production index parameters.

3. A device for identifying the production status of concealed abnormal coalbed methane wells, characterized in that, The device includes: The first acquisition module is used to acquire multiple production index parameters of the target coalbed methane well. These parameters include pressure index parameters, gas-water index parameters, and operating condition parameters. The pressure index parameters include flowing pressure and pipe pressure. Flow pressure refers to the pressure of the target layer measured during coalbed methane well production. The gas-water index parameter is the gas-water fluctuation ratio. The operating condition parameters include the dynamometer card and coal slack. The preset hidden abnormal fluctuation range for the flowing pressure is ±(0.01~0.02)MPa; the preset hidden abnormal fluctuation range for the pipe pressure is ±(0.002~0.005)MPa; the preset hidden abnormal fluctuation range for the gas-water fluctuation ratio is 100~400; the preset hidden abnormal fluctuation range for the dynamometer card is ΔT=10%~20%, where ΔT is the reduction in the area of ​​the dynamometer card; and the preset hidden abnormal fluctuation range for the coal slack is ΔH=5~20, where ΔH is the change in coal slack in meters. The device further includes a second calculation module for calculating the air-water float ratio according to the following formula: S = Δgas / Δwater Wherein, S is the gas-water floating ratio; Δgas is the gas volume change range, in m3; Δwater is the water volume change range, in m3. The second acquisition module is used to acquire production data corresponding to each of the production indicator parameters; The first calculation module is used to calculate the actual fluctuation value of each of the production indicator parameters based on the production data. The first determining module is used to determine whether the actual fluctuation value of each of the production indicator parameters is within the preset hidden abnormal fluctuation range of each of the production indicator parameters; The determination module is used to determine that the target coalbed methane well is in a hidden abnormal well production state when the actual fluctuation value of at least one of the production index parameters is within the preset hidden abnormal fluctuation range of the corresponding production index parameter. The determination module is used to determine and display the cause of the hidden abnormal well according to the hidden abnormal fault table when the pressure index parameter is within the preset hidden abnormal fluctuation range, and the gas-water index parameter and operating condition parameter are not within the preset hidden abnormal fluctuation range. The cause is pressure gauge failure, pump failure, pressure fluctuation in the gathering and transportation system causing a false fluctuation effect on a single well, water accumulation in the pipeline, or a leak in the pipeline. The pressure index parameter being within the preset hidden abnormal fluctuation range includes: the flowing pressure being within the corresponding preset hidden abnormal fluctuation range, but the pipe pressure not being within the corresponding preset hidden abnormal fluctuation range; or the pipe pressure being within the corresponding preset hidden abnormal fluctuation range, but the flowing pressure not being within the corresponding preset hidden abnormal fluctuation range; or both the flowing pressure and the pipe pressure being within their respective preset hidden abnormal fluctuation ranges.

4. The apparatus according to claim 3, characterized in that, The device further includes a second determining module, which is used to determine and display the cause of the hidden abnormal well based on the production index parameters within the preset hidden abnormal fluctuation range and the hidden abnormal well fault table after determining that the current target coalbed methane well is in a hidden abnormal well production state. The hidden abnormal well fault table includes each of the production index parameters and at least one cause corresponding to each of the production index parameters.

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