A method, device and equipment for measuring the pulverized coal concentration in the produced fluid of a coalbed methane well

Abstract

This article provides a method, device and equipment for measuring the coal powder concentration of the produced liquid of a coalbed methane well. The method includes: obtaining the flow rate value of the produced liquid of the coalbed methane well and the corresponding produced liquid density value; calculating the produced liquid density value in a static state based on the produced liquid flow rate value and the corresponding produced liquid density value; calculating the produced liquid coal powder concentration value based on the produced liquid density value in a static state and a preset conversion function of the produced liquid density and coal powder concentration in a static state. This article can obtain the produced liquid coal powder concentration value by directly converting the concentration and density, avoiding the secondary conversion of intermediate parameters in the existing technology, and improving the accuracy of the coal powder concentration value measurement.

Description

Technical Field

[0001] This article belongs to the field of coal mining technology, and specifically relates to a method, device and equipment for measuring the coal powder concentration of the output liquid of a coalbed methane well. Background Art

[0002] Coalbed methane (CBM) wells are surface wells that utilize long-term degassing to reduce reservoir pressure, enabling CBM extraction. Throughout the entire CBM extraction process, pulverized coal is produced. Fine pulverized coal particles are typically discharged from the wellbore as a suspension along with the formation water. Excessive accumulation of medium- to coarse-grained pulverized coal particles can cause mechanical failures, leading to pump sticking, sucker rod breakage, and coal bridge formation at the bottom of the well. This necessitates frequent pump inspections, which can cause significant fluctuations in bottomhole flow pressure, disrupting the flow continuity of gas, water, and pulverized coal, and ultimately impacting individual well productivity. Statistics show that when the pulverized coal concentration is less than 1%, the production well is safe; when it is between 1% and 3%, there is a risk of pump sticking; and when it is above 3%, the risk of pump sticking is high. Therefore, real-time monitoring of the pulverized coal concentration in the produced fluid is crucial during CBM extraction.

[0003] At present, there are two main methods for measuring the coal powder concentration of coalbed methane production liquid: manual monitoring and equipment monitoring. Manual monitoring mainly uses a measuring cup to take samples at the coalbed methane site and observe the color of the production liquid. The color of the production liquid represents different coal powder concentrations. Due to the differences in personal ability levels, the accuracy of the test results of this coal powder concentration test method is difficult to guarantee; and equipment detection generally uses coal powder density as an intermediate parameter for online detection. The calculation of coal powder density is generally based on the average value of multiple samples as the result, which will have an error compared to the true value, so that errors will be superimposed when calculating the coal powder concentration, thereby reducing the accuracy of the coal powder concentration measurement.

[0004] Therefore, how to improve the accuracy of online measurement of coal powder concentration has become a technical problem that needs to be solved urgently. Summary of the Invention

[0005] In view of the above problems of the prior art, the purpose of this paper is to provide a method, device and equipment for measuring the pulverized coal concentration in the produced liquid of a coalbed methane well, which can improve the accuracy of the online measurement of the pulverized coal concentration in the produced liquid of a coalbed methane well.

[0006] In order to solve the above technical problems, the specific technical solutions of this article are as follows:

[0007] In one aspect, the present invention provides a method for measuring the concentration of pulverized coal in produced fluid from a coalbed methane well, the method comprising:

[0008] Obtain the coalbed methane well produced liquid flow rate value and its corresponding produced liquid density value;

[0009] Calculating a density value of the produced fluid in a static state according to the produced fluid flow rate value and the corresponding produced fluid density value;

[0010] The pulverized coal concentration value of the produced liquid is calculated based on the density value of the produced liquid in the static state and a preset conversion function between the density of the produced liquid in the static state and the pulverized coal concentration.

[0011] Furthermore, the calculating of the density value of the output fluid in a static state based on the output fluid flow rate value and the corresponding output fluid density value includes:

[0012] Calculate the density of the produced fluid in a static state based on the produced fluid flow rate value and the corresponding produced fluid density value, in combination with a relationship function between the produced fluid flow rate and the density change percentage;

[0013] The density change percentage is the percentage change of the density value of the produced fluid in a flowing state relative to the density value in a static state.

[0014] Optionally, the calculation process of the relationship function between the produced fluid flow rate and the density change percentage includes:

[0015] Obtaining coal powder and formation water from the work area where the coalbed methane well is located, and preparing them into test output fluid;

[0016] Determining the density of the test output fluid in a static state;

[0017] measuring the density of the test output fluid at different flow rates;

[0018] Calculate the density change percentage of the test output fluid at different flow rates based on the density value of the test output fluid in a static state and the density values at different flow rates;

[0019] According to the different flow rate values of the produced fluid and the density change percentage values of the produced fluid at different flow rates, a relationship function between the flow rate of the produced fluid and the density change percentage is obtained by fitting.

[0020] Furthermore, the output fluid density value in a static state is calculated based on the output fluid flow rate value and its corresponding output fluid density value, in combination with a relationship function between the output fluid flow rate and the density change percentage, including:

[0021] Calculating the produced fluid density change percentage value according to the produced fluid flow rate value and a relationship function between the produced fluid flow rate and the density change percentage;

[0022] The density value of the produced fluid in a static state is calculated based on the produced fluid density value and the produced fluid density change percentage value.

[0023] Optionally, the process of obtaining the conversion function between the density of the produced liquid and the concentration of the pulverized coal in the preset static state includes:

[0024] Obtaining coal powder and formation water from the work area where the coalbed methane well is located, and preparing them into produced fluids of different concentrations;

[0025] Determine the density of produced fluids of different concentrations in a static state;

[0026] According to the density values of the produced fluids with different concentrations in the static state, a conversion function between the density of the produced fluid and the concentration of pulverized coal in the preset static state is fitted.

[0027] Furthermore, obtaining the density value of the produced liquid from the coalbed methane well includes:

[0028] Obtain the initial density value of the produced fluid from the coalbed methane well;

[0029] The initial density value of the produced fluid is temperature-corrected to obtain a density value of the produced fluid.

[0030] Furthermore, the method further comprises:

[0031] Calculate and obtain multiple sets of output liquid pulverized coal concentration values according to a preset time period;

[0032] According to the multiple groups of output liquid pulverized coal concentration values, an output liquid pulverized coal concentration change curve is generated.

[0033] On the other hand, this article also provides a device for measuring the coal powder concentration of coalbed methane well output liquid, the device comprising:

[0034] The output liquid state acquisition module is used to obtain the output liquid flow rate value of the coalbed methane well and its corresponding output liquid density value;

[0035] a produced fluid density calculation module, configured to calculate a produced fluid density value in a static state based on the produced fluid flow rate value and the corresponding produced fluid density value;

[0036] The pulverized coal concentration calculation module is used to calculate the pulverized coal concentration value of the output liquid based on the output liquid density value in the static state and a preset conversion function between the output liquid density and the pulverized coal concentration in the static state.

[0037] On the other hand, this article also provides a device for measuring the coal powder concentration of coalbed methane well output liquid, the device comprising:

[0038] Drain pipe, used to discharge the produced fluid from the coalbed methane well;

[0039] a flow rate sensor, connected to the drainage pipe, for obtaining a flow rate value of the produced liquid in the drainage pipe;

[0040] a density transmitter, connected to the drainage pipe, for obtaining a density value of the output liquid in the drainage pipe;

[0041] The measurement information processing unit is used to obtain the output liquid flow rate value of the coalbed methane well and the corresponding output liquid density value; calculate the output liquid density value in a static state based on the output liquid flow rate value and the corresponding output liquid density value; calculate the output liquid coal powder concentration value based on the output liquid density value in a static state and a preset conversion function between the output liquid density and coal powder concentration in a static state.

[0042] Finally, this document also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the method described above.

[0043] By adopting the above-mentioned technical scheme, the method, device and equipment for measuring the coal powder concentration of the produced liquid of a coalbed methane well described in this article obtain the produced liquid flow rate value of the coalbed methane well and its corresponding produced liquid density value, calculate the produced liquid density value in a static state, and then convert the produced liquid density value in a static state into the produced liquid coal powder concentration value according to the preset conversion function of the produced liquid density and coal powder concentration in the static state. This article can obtain the produced liquid coal powder concentration value by directly converting the concentration and density, avoiding the secondary conversion of intermediate parameters in the existing technology, and improving the accuracy of the coal powder concentration value measurement.

[0044] In order to make the above and other purposes, features and advantages of this article more obvious and easy to understand, the following specifically cites preferred embodiments and provides detailed descriptions in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of this article or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of this article. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0046] Figure 1 A schematic diagram showing the steps of a method for measuring pulverized coal concentration in produced liquid from a coalbed methane well provided in an embodiment of the present invention is shown;

[0047] Figure 2 A schematic diagram of the steps for determining the relationship function between the output fluid flow rate and the density change percentage in the embodiment of this invention is shown;

[0048] Figure 3 A schematic diagram of the calculation process of the output fluid density value in a static state in the embodiment of this article is shown;

[0049] Figure 4A schematic diagram of the steps for obtaining a conversion function of produced liquid density and coal powder concentration in a static state preset in the embodiment of this invention is shown;

[0050] Figure 5 A schematic diagram of generating a pulverized coal concentration variation curve in the embodiment of this article is shown;

[0051] Figure 6 A schematic diagram of the relationship between flow rate and percentage change of produced fluid density is shown;

[0052] Figure 7 A schematic diagram of the relationship between produced liquid density and coal powder concentration in a static state is shown;

[0053] Figure 8 The following is a schematic diagram showing the structure of a device for measuring the concentration of pulverized coal in the produced liquid of a coalbed methane well provided in an embodiment of the present invention;

[0054] Figure 9 The schematic diagram of the structure of the coalbed methane well production liquid coal powder concentration measuring device provided in the embodiment of this invention is shown;

[0055] Figure 10 A schematic diagram of the structure of a computer device provided in an embodiment of this invention is shown.

[0056] Description of the accompanying symbols:

[0057] 1. Drain pipe;

[0058] 2. Flow rate sensor;

[0059] 3. Density transmitter;

[0060] 4. Sewage tank;

[0061] 5. Measurement information processing unit;

[0062] 100. Output fluid status acquisition module;

[0063] 200. Output fluid density calculation module;

[0064] 300. Pulverized coal concentration calculation module;

[0065] 1002. Computer equipment;

[0066] 1004, processor;

[0067] 1006. Memory;

[0068] 1008, driving mechanism;

[0069] 1010, input / output module;

[0070] 1012. Input device;

[0071] 1014. Output device;

[0072] 1016. Presentation equipment;

[0073] 1018. Graphical user interface;

[0074] 1020, network interface;

[0075] 1022, communication link;

[0076] 1024. Communication bus. DETAILED DESCRIPTION

[0077] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of this document. Obviously, the embodiments described are only part of the embodiments of this document, not all of the embodiments. Based on the embodiments of this document, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this document.

[0078] It should be noted that the terms "first," "second," and the like in the specification and claims herein and in the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product, or device comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to these processes, methods, products, or devices.

[0079] Coalbed methane wells are surface wells that achieve coalbed methane extraction by reducing reservoir pressure through long-term drainage and pressure reduction methods. Coal powder is produced throughout the entire drainage and extraction process. To prevent the well pump from clogging due to excessive coal powder concentration, the coal powder concentration in the produced fluid needs to be monitored in real time. However, in existing technologies, real-time monitoring of coal powder concentration is generally achieved through manual identification or online detection using the coal powder density in the formation as an intermediate parameter. The coal powder density is generally calculated by taking the average value of multiple samples as the result, which may be different from the actual value. As a result, errors will be superimposed when calculating the coal powder concentration, thereby reducing the accuracy of the coal powder concentration measurement.

[0080] In order to solve the above problems, the embodiments of this article provide a method for measuring the coal powder concentration in the produced fluid of a coalbed methane well, which can improve the accuracy of online measurement of the coal powder concentration in the produced fluid. Figure 1This is a schematic diagram of the steps of a method for measuring the coal powder concentration of the output liquid of a coalbed methane well provided in the embodiment of this article. This specification provides the method operation steps as described in the embodiment or flow chart, but it may include more or fewer operation steps based on conventional or non-creative labor. The order of steps listed in the embodiment is only one way of executing the steps among many, and does not represent the only execution order. When the actual system or device product is executed, it can be executed in the order or in parallel according to the method shown in the embodiment or the accompanying drawings. Specifically, Figure 1 As shown, the method may include:

[0081] S101: Obtaining a coalbed methane well produced liquid flow rate value and a corresponding produced liquid density value;

[0082] S102: Calculating a density value of the output fluid in a static state according to the output fluid flow rate value and the corresponding output fluid density value;

[0083] S103: Calculate and obtain the pulverized coal concentration value of the output liquid according to the output liquid density value in the static state and a preset conversion function between the output liquid density and the pulverized coal concentration in the static state.

[0084] It can be understood that this article obtains the real-time output liquid flow rate value and its corresponding output liquid density value in the coalbed methane well, and then calculates the output liquid density value in the static state. The density value of the output liquid under the same coal powder concentration in the static state is certain, and the coal powder concentration and the density of the output liquid show a certain correlation in the static state. Therefore, through the preset conversion function of the output liquid density and coal powder concentration in the static state, combined with the calculated output liquid density value in the static state, the output liquid coal powder concentration value can be directly calculated. Therefore, this article can obtain the output liquid coal powder concentration by directly converting the output liquid density value in the static state, which improves the efficiency and accuracy of coal powder concentration measurement.

[0085] In detail, the coal powder concentration of the produced liquid (ψ) represents the mass percentage of coal powder in the produced liquid, and the produced liquid density (ρ) represents the ratio of the mass and volume of the produced liquid of the coalbed methane well. The produced liquid of the coalbed methane well is actually a mixture of formation water and formation coal powder. Therefore, the geological formation environment under the same working area environment is similar. Therefore, under the same state, such as the static state, the produced liquid density and the coal powder concentration have a certain correspondence, and this correspondence can be measured in a laboratory environment. Therefore, as long as the produced liquid density under the static state is obtained, the coal powder concentration in the produced liquid can be calculated through the above correspondence. The density of the liquid will also change under different flow rates, but at the same coal powder concentration, the change in the density value of the produced liquid in the flowing state relative to the density value in the static state is consistent. It can be considered that the density value of the produced liquid under different concentrations at the same flow rate is consistent with the density change percentage relative to its density value in the static state. Therefore, the corresponding density change percentage at different flow rates can be measured in a laboratory environment to fit the correspondence between the flow rate and the density change percentage. In this way, we can obtain the real-time produced liquid flow rate value and combine it with the above correspondence to obtain the density change percentage at the flow rate value, and then combine it with the density value at the flow rate value to obtain the density value of the produced liquid in the static state.

[0086] The density value of the produced fluid at different flow rates (including in a static state) can be obtained through a density transmitter, and the flow rate of the produced fluid can be obtained through a flow rate sensor.

[0087] Accordingly, the calculation of the output fluid density value in a static state based on the output fluid flow rate value and the corresponding output fluid density value includes:

[0088] Calculate the density of the produced fluid in a static state based on the produced fluid flow rate value and the corresponding produced fluid density value, in combination with a relationship function between the produced fluid flow rate and the density change percentage;

[0089] The density change percentage is the percentage change of the density value of the produced fluid in a flowing state relative to the density value in a static state.

[0090] In this specification, the relationship function between produced fluid flow rate and percent density change can be understood as the corresponding relationship between produced fluid flow rate and percent density change described above. Because formation water and pulverized coal have identical compositions within the same operating environment, the density of the produced fluid under the same conditions is solely related to the masses of the formation water and pulverized coal. Accordingly, the percent density change remains consistent under varying concentrations, making this relationship function adaptable within the same operating environment. Therefore, a single calibration allows for universal online measurement of pulverized coal concentration in produced fluids from all CBM wells within the same operating area, improving the efficiency of produced fluid pulverized coal concentration measurement and reducing equipment configuration and labor costs.

[0091] In actual work, in order to obtain the relationship function between the output fluid flow rate and the density change percentage, the output fluid density change percentage values at different flow rates can be measured in a laboratory environment, and then the relationship curve between the flow rate and the output fluid density change percentage can be drawn to obtain the corresponding relationship function. Therefore, Figure 2 As shown, the calculation process of the relationship function between the output fluid flow rate and the density change percentage includes:

[0092] S201: Obtain pulverized coal and formation water from the work area where the coalbed methane well is located, and prepare them into test output fluid;

[0093] S202: measuring the density of the test output fluid in a static state;

[0094] S203: measuring the density of the test output fluid at different flow rates;

[0095] S204: Calculating a density change percentage of the test output fluid at different flow rates based on the density value of the test output fluid in a static state and the density values at different flow rates;

[0096] S205: According to the different flow rate values of the produced fluid and the density change percentage values of the produced fluid at different flow rates, a relationship function between the flow rate of the produced fluid and the density change percentage is obtained by fitting.

[0097] Alternatively, the calculation formula for the density change percentage value at a certain flow rate may be the following formula (1):

[0098]

[0099] Where i is the flow rate of the produced fluid, in m / min, c i is the density change percentage of the produced fluid at flow rate i, ρ m is the density of the produced fluid at a flow rate of i, in g / cm 3 ,ρ s The density of the produced fluid in a static state, in g / cm3 .

[0100] In some other embodiments, the density change percentage value at a certain flow rate can also be calculated in other ways, which can be the ratio of the difference between the density value of the produced fluid in the flowing state and the density value in the static state to the density value in the static state. The specific calculation process is not limited in this specification.

[0101] In the embodiment of this specification, a group of test output fluids of coal powder concentration can be configured, which can improve the efficiency of determining the relationship function. In order to ensure the accuracy of the fitted function, the density values at more flow rates can be provided, so that more density change percentage values corresponding to more flow rates can be obtained. Therefore, the accuracy of the curve drawing the relationship between flow rate and density change percentage can be further guaranteed, thereby improving the accuracy of the fitting function.

[0102] In some other embodiments, in order to further ensure the accuracy of the fitting curve, multiple groups of test output fluids with coal powder concentrations can be set up, and multiple groups of flow rate measurements are performed on the output fluids with each group of coal powder concentrations. In this way, the adaptability of the relationship function between the output fluid flow rate and the density change percentage in this article can be further verified through the measurement of multiple groups of coal powder concentrations, thereby ensuring the accuracy of the output fluid density in a static state quickly obtained by the density change percentage in this article.

[0103] For example, by obtaining multiple sets of flow rate and density change percentage coordinate points in the laboratory, and then drawing a flow rate (v)-output fluid density change percentage (c) relationship chart, the corresponding relationship function is finally obtained based on a computer fitting method, as shown in the following formula (2):

[0104] c=f(v) (2)

[0105] Where c is the percentage change in density of the produced fluid, unit is %, dimensionless; v is the flow velocity, unit is m / min.

[0106] It should be noted that the output fluid flow rate (v) represents the distance passed through the pipeline per unit time, and the unit is m / min. Therefore, in order to avoid different output fluid flow rates in different pipelines, the test output fluid and the output fluid in actual work can be run in pipelines of the same specifications. Furthermore, the flow rate can be calibrated to ensure that the obtained flow rates are under the same standard, thereby improving the accuracy of coal powder concentration measurement.

[0107] Therefore, based on the relationship function between the output fluid flow rate and the density change percentage, as shown in the following example: Figure 3 As shown, the output fluid density value in a static state is calculated based on the output fluid flow rate value and its corresponding output fluid density value, combined with the relationship function between the output fluid flow rate and the density change percentage, including:

[0108] S301: Calculating the output fluid density change percentage value according to the output fluid flow rate value and the relationship function between the output fluid flow rate and the density change percentage;

[0109] S302: Calculate the density value of the output fluid in a static state according to the output fluid density value and the output fluid density change percentage value.

[0110] In actual work, the specific calculation path of the density of the produced fluid in a static state is as follows: Figure 6 As shown in the figure, from a→b→c, the flow rate data a measured by the flow rate sensor is used to obtain the percentage change c of the produced fluid density through formula (2). The calculation formula (3) is as follows:

[0111] ρ s =ρ m / c (3)

[0112] Therefore, after obtaining the density of the produced liquid in a static state, combined with the preset conversion function of the produced liquid density and coal powder concentration in a static state, the corresponding coal powder concentration of the produced liquid can be obtained, such as Figure 4 As shown, the process of obtaining the conversion function of the output liquid density and the coal powder concentration under the preset static state includes:

[0113] S401: Obtain pulverized coal and formation water from the work area where the coalbed methane well is located, and prepare them into produced fluids of different concentrations;

[0114] S402: measuring the density of the output fluids of different concentrations in a static state;

[0115] S403: According to the density values of the produced fluids of different concentrations in the static state, a preset conversion function of the density of the produced fluid in the static state and the concentration of the pulverized coal is fitted.

[0116] The output fluids of different concentrations are configured as output fluids of coalbed methane wells with known concentrations. Then, the density of the output fluids under static conditions is measured by a density transmitter to determine the corresponding relationship between the coal powder concentration of the output fluids of the coalbed methane wells and the density of the output fluids under static conditions. Specifically, the coal powder concentration (ψ) of the output fluids of the coalbed methane wells and the density (ρ) under static conditions are plotted. s ) between the two groups as shown in the figure Figure 7 As shown, the following formula (4) is obtained by curve fitting:

[0117] ψ=f(ρ s ) (4)

[0118] Where, ψ is the output liquid pulverized coal concentration, unit %, dimensionless; ρ s is the density of the produced fluid under static conditions, in g / cm3 .

[0119] In actual work, the specific calculation path for converting the density of the produced liquid to the coal powder concentration in a static state is as follows: Figure 7 As shown in the figure, from d→e→f, the density of the produced liquid in the static state corresponds to point d on the calculation path. The above formula (4) is used to calculate f, which is the coal powder concentration corresponding to the density of the produced liquid in the static state.

[0120] In the embodiment of this specification, in order to avoid the influence of temperature change during the measurement process, the method of obtaining the density value of the produced liquid of the coalbed methane well includes:

[0121] Obtain the initial density value of the produced fluid from the coalbed methane well;

[0122] The initial density value of the produced fluid is temperature-corrected to obtain a density value of the produced fluid.

[0123] When performing temperature correction, the temperature compensation principle can be used. For example, by measuring the density of the produced fluid at different temperatures and comparing it with the density of the same produced fluid at a set standard temperature, the percentage change in density of the produced fluid at different temperatures can be obtained. The density change percentage can then be used to correct the density to the density at the standard temperature. When obtaining the density value of the produced fluid from a coalbed methane well, a vibrating density transmitter with a built-in temperature compensator can be used to obtain it. This allows the corrected density value to be obtained directly, avoiding the time and cost of later corrections, thereby improving measurement efficiency and ensuring online measurement of coal powder concentration.

[0124] Of course, when measuring the pulverized coal concentration online, the change of pulverized coal concentration can also be obtained, that is, the change curve of pulverized coal concentration, such as Figure 5 As shown, the method may further include:

[0125] S104: Calculate and obtain multiple sets of output liquid pulverized coal concentration values according to a preset time period;

[0126] S105: generating a pulverized coal concentration variation curve of the output liquid according to the multiple groups of pulverized coal concentration values of the output liquid.

[0127] The preset time period is set according to actual conditions, such as the approximate average flow rate of the output fluid, such as 5s / time. In some other embodiments, it can also be set according to different stages of underground coal mining. For example, in the early stages of mining, less coal dust is released, the coal dust concentration is low, and the impact on the well pump is actually less. Therefore, the preset time period can be longer. In the middle and late stages of mining, a large amount of coal dust has been released, and the coal dust concentration is relatively high, which has a greater impact on the well pump. Therefore, the preset time period should be shorter. Setting it according to the mining cycle in this way allows the actual conditions at different stages to be different, thereby increasing the flexibility of setting the preset time period. By generating a coal dust concentration change curve in real time, this paper can timely judge the changing trend of the coal dust concentration, thereby providing timely warnings, avoiding phenomena such as pump jams, and reducing maintenance costs.

[0128] Therefore, this article provides a method for determining the coal powder concentration of the produced liquid of a coalbed methane well. By obtaining the produced liquid flow rate value of the coalbed methane well and its corresponding produced liquid density value, the produced liquid density value in a static state is calculated, and then according to the preset conversion function of the produced liquid density and coal powder concentration in a static state, the produced liquid density value in the static state is converted into the produced liquid coal powder concentration value. This article can obtain the produced liquid coal powder concentration value through direct conversion of concentration and density, avoiding the secondary conversion of intermediate parameters in the existing technology and improving the accuracy of the coal powder concentration value measurement.

[0129] Based on the same inventive concept, the embodiment of this specification also provides a device for measuring the concentration of coal powder in the output liquid of a coalbed methane well, such as Figure 8 As shown, the device includes:

[0130] The produced liquid state acquisition module 100 is used to obtain the produced liquid flow rate value and the corresponding produced liquid density value of the coalbed methane well;

[0131] A produced liquid density calculation module 200 is configured to calculate a produced liquid density value in a static state based on the produced liquid flow rate value and the corresponding produced liquid density value;

[0132] The pulverized coal concentration calculation module 300 is used to calculate the pulverized coal concentration value of the output liquid according to the output liquid density value in the static state and a preset conversion function between the output liquid density and the pulverized coal concentration in the static state.

[0133] The beneficial effects achieved by the above-mentioned device are consistent with the beneficial effects achieved by the above-mentioned method, and this specification does not limit them.

[0134] Furthermore, the present invention also provides a device for measuring the concentration of coal powder in the output liquid of a coalbed methane well, such as Figure 9 As shown, the device includes:

[0135] Drain pipe 1, used to discharge the produced fluid from the coalbed methane well;

[0136] A flow rate sensor 2, connected to the drainage pipe, for obtaining a flow rate value of the produced liquid in the drainage pipe;

[0137] A density transmitter 3 is connected to the drainage pipe and is used to obtain the density value of the output liquid in the drainage pipe;

[0138] The measurement information processing unit 5 is used to obtain the output liquid flow rate value of the coalbed methane well and the corresponding output liquid density value; calculate the output liquid density value in a static state based on the output liquid flow rate value and the corresponding output liquid density value; calculate the output liquid coal powder concentration value based on the output liquid density value in a static state and a preset conversion function between the output liquid density and coal powder concentration in a static state.

[0139] Optionally, the flow rate sensor 2 and the density transmitter 3 may transmit the measurement data to the measurement information processing unit via wireless transmission. In some other embodiments, there may be other transmission methods, which are not limited in this specification.

[0140] Furthermore, the equipment also includes a sewage tank 4 for receiving the produced fluid discharged from the drainage pipe 1.

[0141] Preferably, the density transmitter 3 is a vibration density transmitter with a built-in temperature compensator, which can monitor the density of the produced liquid of the coalbed methane well in real time without the need for secondary temperature correction of the density of the produced liquid.

[0142] Furthermore, the device further comprises a display module, which may be a display screen connected to the measurement information processing unit 5 and configured to display and record a curve of changes in the output liquid pulverized coal concentration.

[0143] The equipment provided in this manual is simple and portable, highly integrated, small in size, and easy to promote and apply. At the same time, the vibration density transmitter has its own temperature correction, eliminating the influence of temperature during the test process.

[0144] like Figure 10As shown, a computer device provided in an embodiment of the present invention is shown. The computer device 1002 may include one or more processors 1004, such as one or more central processing units (CPUs), each of which may implement one or more hardware threads. The computer device 1002 may also include any memory 1006 for storing any type of information, such as code, settings, data, etc. For example, without limitation, the memory 1006 may include any one or more combinations of the following: any type of RAM, any type of ROM, a flash memory device, a hard disk, an optical disk, etc. More generally, any memory may use any technology to store information. Furthermore, any memory may provide volatile or non-volatile retention of information. Furthermore, any memory may represent a fixed or removable component of the computer device 1002. In one embodiment, when the processor 1004 executes associated instructions stored in any memory or combination of memories, the computer device 1002 may perform any operation of the associated instructions. The computer device 1002 also includes one or more drive mechanisms 1008, such as a hard disk drive mechanism, an optical disk drive mechanism, etc., for interacting with any memory.

[0145] Computer device 1002 may also include an input / output module 1010 (I / O) for receiving various inputs (via input device 1012) and providing various outputs (via output device 1014). A specific output mechanism may include a presentation device 1016 and an associated graphical user interface (GUI) 1018. In other embodiments, input / output module 1010 (I / O), input device 1012, and output device 1014 may not be included, and the computer device 1002 may simply be a computer device in a network. Computer device 1002 may also include one or more network interfaces 1020 for exchanging data with other devices via one or more communication links 1022. One or more communication buses 1024 couple the components described above together.

[0146] The communication link 1022 may be implemented in any manner, for example, via a local area network, a wide area network (e.g., the Internet), a point-to-point connection, etc., or any combination thereof. The communication link 1022 may include any combination of hardwired links, wireless links, routers, gateway functions, name servers, etc., governed by any protocol or combination of protocols.

[0147] Corresponding to Figure 1-Figure 5 The embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, which executes the steps of the above method when executed by a processor.

[0148] The embodiment of the present invention also provides a computer readable instruction, wherein when the processor executes the instruction, the program causes the processor to execute the following Figures 1 to 5 The method shown.

[0149] It should be understood that in the various embodiments of this document, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this document.

[0150] It should also be understood that in the embodiments herein, the term "and / or" merely describes an association between associated objects, indicating that three possible relationships exist. For example, "A and / or B" could represent: A alone, A and B simultaneously, or B alone. Furthermore, the character " / " in this document generally indicates an "or" relationship between the associated objects.

[0151] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the composition and steps of each example according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this document.

[0152] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0153] In the several embodiments provided herein, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices, or units, or can be an electrical, mechanical, or other form of connection.

[0154] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiments herein.

[0155] In addition, the functional units in the various embodiments herein may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0156] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this article is essentially or the part that contributes to the existing technology, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of this article. The aforementioned storage medium includes: various media that can store program code, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0157] This article uses specific embodiments to illustrate the principles and implementation methods of this article. The description of the above embodiments is only used to help understand the methods and core ideas of this article. At the same time, for those skilled in the art, based on the ideas of this article, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation to this article.

Claims

1. A method for measuring the concentration of pulverized coal in the produced liquid of a coalbed methane well, characterized in that: The method comprises: Obtain the coalbed methane well produced liquid flow rate value and its corresponding produced liquid density value; Calculating a density value of the produced fluid in a static state according to the produced fluid flow rate value and the corresponding produced fluid density value; The pulverized coal concentration value of the output liquid is calculated based on the output liquid density value in the static state and a preset conversion function between the output liquid density and the pulverized coal concentration in the static state; The process of obtaining the conversion function between the density of the produced liquid and the concentration of the pulverized coal in the preset static state includes: Obtaining coal powder and formation water from the work area where the coalbed methane well is located, and preparing them into produced fluids of different concentrations; Determine the density of produced fluids of different concentrations in a static state; According to the density values of the produced fluids with different concentrations in the static state, a conversion function between the density of the produced fluid and the concentration of pulverized coal in the preset static state is fitted.

2. The method according to claim 1, characterized in that The step of calculating the density value of the produced fluid in a static state based on the produced fluid flow rate value and the corresponding produced fluid density value includes: Calculate the density of the produced fluid in a static state based on the produced fluid flow rate value and the corresponding produced fluid density value, in combination with a relationship function between the produced fluid flow rate and the density change percentage; The density change percentage is the percentage change of the density value of the produced fluid in a flowing state relative to the density value in a static state.

3. The method according to claim 2, characterized in that The calculation process of the relationship function between the produced fluid flow rate and the density change percentage includes: Obtaining coal powder and formation water from the work area where the coalbed methane well is located, and preparing them into test output fluid; Determining the density of the test output fluid in a static state; measuring the density of the test output fluid at different flow rates; Calculate the density change percentage of the test output fluid at different flow rates based on the density value of the test output fluid in a static state and the density values at different flow rates; According to the different flow rate values of the produced fluid and the density change percentage values of the produced fluid at different flow rates, a relationship function between the flow rate of the produced fluid and the density change percentage is obtained by fitting.

4. The method according to claim 3, characterized in that The method of calculating the density value of the produced liquid in a static state based on the produced liquid flow rate value and the corresponding produced liquid density value, in combination with a relationship function between the produced liquid flow rate and the density change percentage, includes: Calculating the produced fluid density change percentage value according to the produced fluid flow rate value and a relationship function between the produced fluid flow rate and the density change percentage; The density value of the produced fluid in a static state is calculated based on the produced fluid density value and the produced fluid density change percentage value.

5. The method according to claim 1, wherein The method of obtaining the density value of the produced liquid from the coalbed methane well includes: Obtain the initial density value of the produced fluid from the coalbed methane well; The initial density value of the produced fluid is temperature-corrected to obtain a density value of the produced fluid.

6. The method according to claim 1, characterized in that The method further comprises: Calculate and obtain multiple sets of output liquid pulverized coal concentration values according to a preset time period; According to the multiple groups of output liquid pulverized coal concentration values, an output liquid pulverized coal concentration change curve is generated.

7. A device for measuring the concentration of pulverized coal in the output liquid of a coalbed methane well, characterized in that: The device comprises: The output liquid state acquisition module is used to obtain the output liquid flow rate value of the coalbed methane well and its corresponding output liquid density value; a produced fluid density calculation module, configured to calculate a produced fluid density value in a static state based on the produced fluid flow rate value and the corresponding produced fluid density value; A pulverized coal concentration calculation module is used to calculate the pulverized coal concentration value of the output liquid based on the output liquid density value in the static state and a preset conversion function between the output liquid density and the pulverized coal concentration in the static state; The process of obtaining the conversion function between the density of the produced liquid and the concentration of the pulverized coal in the preset static state includes: Obtaining coal powder and formation water from the work area where the coalbed methane well is located, and preparing them into produced fluids of different concentrations; Determine the density of produced fluids of different concentrations in a static state; According to the density values of the produced fluids with different concentrations in the static state, a conversion function between the density of the produced fluid and the concentration of pulverized coal in the preset static state is fitted.

8. A device for measuring the concentration of pulverized coal in the output liquid of a coalbed methane well, characterized in that: The device comprises: Drain pipe, used to discharge the produced fluid from the coalbed methane well; a flow rate sensor, connected to the drainage pipe, for obtaining a flow rate value of the produced liquid in the drainage pipe; a density transmitter, connected to the drainage pipe, for obtaining a density value of the output liquid in the drainage pipe; A measurement information processing unit is used to obtain the output fluid flow rate value of a coalbed methane well and the corresponding output fluid density value; calculate the output fluid density value in a static state based on the output fluid flow rate value and the corresponding output fluid density value; calculate the output fluid coal powder concentration value based on the output fluid density value in a static state and a preset conversion function of the output fluid density and coal powder concentration in a static state; wherein the process of obtaining the preset conversion function of the output fluid density and coal powder concentration in a static state includes: obtaining coal powder and formation water in the working area where the coalbed methane well is located, and configuring them into output fluids of different concentrations; measuring the density values of the output fluids of different concentrations in a static state; and fitting the preset conversion function of the output fluid density and coal powder concentration in a static state based on the density values of the output fluids of different concentrations in a static state.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

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