Method and device for determining drainage parameters, computer equipment and storage medium

Abstract

The embodiment of the application discloses a kind of drainage parameter determination method, device, computer equipment and storage medium, belong to oil and gas exploration development field.The method comprises: obtaining the first pressure parameter of coalbed gas well, first drainage parameter and second pressure parameter, obtains recovery duration, tubing diameter and casing diameter of coalbed gas well, according to first pressure parameter, first drainage parameter, second pressure parameter, recovery duration, tubing diameter and casing diameter, obtain the second drainage parameter of coalbed gas well in recovery time period.The method can quantify the pressure parameter and drainage parameter of coalbed gas well, and also can determine the drainage parameter of recovery time period according to a series of parameter indexes, provide accurate data support for making control plan in subsequent work, guide coalbed gas well to restore normal exhaust state quickly and orderly, shorten recovery time, improve the efficiency of normal gas drainage after well shut-in.

Description

Technical Field

[0001] This application relates to the field of oil and gas exploration and development, and in particular to a method, apparatus, computer equipment and storage medium for determining drainage parameters. Background Technology

[0002] In the field of oil and gas exploration and development, the principle of coalbed methane extraction is to continuously drain and depressurize coalbed methane wells, causing methane molecules to desorb from the matrix surface within the coal seam and be produced from the well through diffusion and seepage. However, during production, coalbed methane wells inevitably shut down due to factors such as power outages, equipment failures, and pump maintenance. Shutdowns cause a rapid rise in the wellbore pressure, which is detrimental to methane desorption and may even lead to the well ceasing methane production altogether. Therefore, determining the drainage parameters after the shutdown problem is resolved to quickly reduce the wellbore pressure and restore normal gas production becomes a crucial issue that needs to be addressed. Summary of the Invention

[0003] This application provides a method, apparatus, computer equipment, and storage medium for determining drainage parameters, which helps operators determine the drainage parameters to be used to restore a coalbed methane well to normal operation after shutdown, providing data support for subsequent work. The technical solution is as follows:

[0004] On the one hand, a method for determining drainage parameters is provided, the method comprising:

[0005] The method obtains a first pressure parameter, a first drainage parameter, and a second pressure parameter of a coalbed methane well. The first pressure parameter is the pressure parameter of the coalbed methane well during a first gas production period. The first drainage parameter is the drainage parameter of the coalbed methane well during the first gas production period. The second pressure parameter is the pressure parameter of the coalbed methane well at the start of a recovery period. The first gas production period refers to the period during which the coalbed methane well discharges gas under normal operating conditions. The start of the recovery period is the moment when the coalbed methane well begins to drain water after shutdown. The end of the recovery period is the start of the second gas production period. The second gas production period is the gas production period following the recovery period.

[0006] The recovery time, the tubing diameter and casing diameter of the coalbed methane well are obtained, wherein the recovery time is the time required from the start time of the recovery period to the start time of the second gas production period;

[0007] The second drainage parameters of the coalbed methane well during the recovery period are obtained based on the first pressure parameter, the first drainage parameter, the second pressure parameter, the recovery time, the tubing diameter, and the casing diameter.

[0008] In one possible implementation, obtaining the first pressure parameter, the first drainage parameter, and the second pressure parameter of the coalbed methane well includes:

[0009] Obtain the drainage curve of the coalbed methane well, which is used to represent the correspondence between drainage time and flowing pressure and casing pressure;

[0010] Based on the drainage curve, the first pressure parameter and the second pressure parameter are obtained. The first pressure parameter includes the first flowing pressure and the first casing pressure. The second pressure parameter includes the second flowing pressure and the second casing pressure of the coalbed methane well at the beginning of the recovery period.

[0011] The first stroke and the first average daily drainage volume of the coalbed methane well are obtained as the first drainage parameters. The first stroke is used to represent the rotational speed of the drainage equipment during the first gas production period, and the first average daily drainage volume is used to represent the average daily drainage volume of the coalbed methane well during the first gas production period.

[0012] In another possible implementation, obtaining the second drainage parameters of the coalbed methane well during the recovery time period based on the first pressure parameter, the first drainage parameter, the second pressure parameter, the recovery time, the tubing diameter, and the casing diameter includes:

[0013] The second stroke and the second average daily drainage of the coalbed methane well are obtained based on the first flowing pressure, the first casing pressure, the first stroke, the first average daily drainage, the second flowing pressure, the second casing pressure, the recovery time, the tubing diameter, and the casing diameter, and are used as the second drainage parameters of the coalbed methane well.

[0014] In another possible implementation, obtaining the second stroke and the second average daily drainage of the coalbed methane well based on the first flowing pressure, the first casing pressure, the first stroke count, the first average daily drainage volume, the second flowing pressure, the second casing pressure, the recovery time, the tubing diameter, and the casing diameter, as the second drainage parameters of the coalbed methane well, includes:

[0015] The second flush and the second average daily drainage volume are obtained using the following formulas:

[0016]

[0017]

[0018] Wherein, V2 is the second average daily drainage volume; V1 is the first average daily drainage volume; P L1 P is the first flow pressure; L2 The second flow pressure; P T1 For the first set of pressure; PT2 D1 is the second casing pressure; D2 is the casing diameter; D2 is the tubing diameter; t is the recovery time; ρ is the liquid density; g is the gravitational acceleration; N2 is the second stroke; N1 is the first stroke.

[0019] In another possible implementation, the second drainage parameters include the second flushing frequency and the second average daily drainage volume; after obtaining the second drainage parameters of the coalbed methane well during the recovery period based on the first pressure parameter, the first drainage parameters, the second pressure parameter, the recovery time, the tubing diameter, and the casing diameter, the method further includes:

[0020] The coalbed methane well is drained using the second stroke to obtain the third average daily drainage volume of the coalbed methane well. The third average daily drainage volume is the average daily drainage volume of the coalbed methane well when it is drained using the second stroke during the recovery period.

[0021] The difference between the third average daily drainage volume and the second average daily drainage volume is obtained, and the difference is used to characterize the recovery effect of the coalbed methane well.

[0022] On the other hand, a device for determining drainage parameters is provided, the device comprising:

[0023] The first acquisition module is used to acquire the first pressure parameter, the first drainage parameter, and the second pressure parameter of the coalbed methane well. The first pressure parameter is the pressure parameter of the coalbed methane well during the first gas production time period. The first drainage parameter is the drainage parameter of the coalbed methane well during the first gas production time period. The second pressure parameter is the pressure parameter of the coalbed methane well at the start of the recovery time period. The first gas production time period refers to the time period during which the coalbed methane well discharges gas under normal working conditions. The start time of the recovery time period is the time when the coalbed methane well begins to drain water after shutdown. The end time of the recovery time period is the start time of the second gas production time period. The second gas production time period is the gas production time period after the recovery time period.

[0024] The second acquisition module is used to acquire the recovery time, the tubing diameter and casing diameter of the coalbed methane well, wherein the recovery time is the time required from the start time of the recovery period to the start time of the second gas production period.

[0025] The parameter determination module is used to obtain the second drainage parameters of the coalbed methane well during the recovery time period based on the first pressure parameter, the first drainage parameter, the second pressure parameter, the recovery time, the tubing diameter, and the casing diameter.

[0026] In one possible implementation, the first acquisition module includes:

[0027] The curve acquisition unit is used to acquire the drainage curve of the coalbed methane well, and the drainage curve is used to represent the correspondence between drainage time and flowing pressure and casing pressure.

[0028] The pressure parameter acquisition unit is used to acquire the first pressure parameter and the second pressure parameter according to the drainage curve. The first pressure parameter includes the first flowing pressure and the first casing pressure, and the second pressure parameter includes the second flowing pressure and the second casing pressure of the coalbed methane well at the beginning of the recovery period.

[0029] The drainage parameter acquisition unit is used to acquire the first stroke and the first average daily drainage volume of the coalbed methane well as the first drainage parameters. The first stroke is used to represent the rotation speed of the drainage equipment during the first gas production period, and the first average daily drainage volume is used to represent the average daily drainage volume of the coalbed methane well during the first gas production period.

[0030] In another possible implementation, the parameter determination module includes:

[0031] The drainage parameter acquisition unit is used to acquire the second stroke and the second average daily drainage of the coalbed methane well based on the first flowing pressure, the first casing pressure, the first stroke, the first average daily drainage, the second flowing pressure, the second casing pressure, the recovery time, the tubing diameter, and the casing diameter, as the second drainage parameters of the coalbed methane well.

[0032] In another possible implementation, the parameter determination module includes:

[0033] The drainage parameter acquisition unit is further configured to obtain the second flush and the second average daily drainage volume using the following formula:

[0034]

[0035]

[0036] Wherein, V2 is the second average daily drainage volume; V1 is the first average daily drainage volume; P L1 P is the first flow pressure; L2 The second flow pressure; P T1 For the first set of pressure; P T2 D1 is the second casing pressure; D2 is the casing diameter; D2 is the tubing diameter; t is the recovery time; ρ is the liquid density; g is the gravitational acceleration; N2 is the second stroke; N1 is the first stroke.

[0037] In another possible implementation, the second drainage parameters include a second flush and a second average daily drainage volume; the device further includes:

[0038] The drainage module is used to drain the coalbed methane well using the second stroke and obtain the third average daily drainage volume of the coalbed methane well. The third average daily drainage volume is the average daily drainage volume of the coalbed methane well when it is drained according to the second stroke during the recovery period.

[0039] The difference acquisition module is used to acquire the difference between the third daily average drainage volume and the second daily average drainage volume, and the difference is used to characterize the recovery effect of the coalbed methane well.

[0040] On the other hand, a computer device is provided, the computer device including a processor and a memory, the memory storing at least one piece of program code, the at least one piece of program code being loaded and executed by the processor to perform the operations performed in the sampling parameter determination method as described above.

[0041] On the other hand, a computer-readable storage medium is provided, wherein at least one piece of program code is stored therein, the at least one piece of program code being loaded and executed by a processor to perform the operations performed in the sampling parameter determination method as described above.

[0042] In another aspect, a computer program product or computer program is provided, the computer program product or computer program including computer program code stored in a computer-readable storage medium. A processor of a computer device reads the computer program code from the computer-readable storage medium, and the processor executes the computer program code, causing the computer device to perform the operations performed in the sampling parameter determination method described above.

[0043] The beneficial effects of the technical solutions provided in this application include at least the following:

[0044] The method, apparatus, computer equipment, and storage medium provided in this application embodiment can quantify the pressure and drainage parameters of coalbed methane wells under different gas production conditions within different time periods, as well as a series of parameter indicators such as recovery time, tubing diameter, and casing diameter. Based on these parameter indicators, the drainage parameters within the recovery time period are determined, providing accurate data support for formulating control plans in subsequent work. Subsequently, drainage of the coalbed methane well according to the drainage parameters within the recovery time period can control the steady drainage and stable liquid reduction within the planned recovery time, guiding the coalbed methane well to quickly and orderly restore normal gas production, shortening the recovery time, improving the efficiency of restoring normal gas production after well shutdown, and avoiding problems such as pump jamming caused by excessively large drainage parameters, as well as slow recovery of gas production caused by excessively small drainage parameters. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a flowchart of a method for determining sampling parameters provided in an embodiment of this application;

[0047] Figure 2 This is a flowchart of another method for determining sampling parameters provided in an embodiment of this application;

[0048] Figure 3 This is a schematic diagram illustrating the correspondence between drainage time and pressure parameters provided in an embodiment of this application;

[0049] Figure 4 This is a schematic diagram of the structure and parameters of a coalbed methane well provided in an embodiment of this application;

[0050] Figure 5 This is a schematic diagram of the structure of a sampling parameter determination device provided in an embodiment of this application;

[0051] Figure 6 This is a schematic diagram of the structure of a terminal provided in an embodiment of this application;

[0052] Figure 7 This is a schematic diagram of the structure of a server provided in an embodiment of this application. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0054] The terms “first,” “second,” “third,” etc., used in this application may be used to describe various concepts, but unless otherwise stated, these concepts are not limited by these terms. These terms are used only to distinguish one concept from another. For example, without departing from the scope of this application, the first model may be referred to as the second model, and similarly, the second model may be referred to as the first model.

[0055] As used in this application, the terms "multiple" and "each" are used, with "multiple" including two or more, and "each" referring to each of the corresponding multiples. For example, multiple radii include seven radii, and "each" refers to each of those seven radii.

[0056] Figure 1This is a flowchart of a method for determining sampling parameters provided in an embodiment of this application, such as... Figure 1 As shown, the method includes:

[0057] 101. Obtain the first pressure parameters, first drainage parameters, and second pressure parameters of the coalbed methane well.

[0058] The first pressure parameter is the pressure parameter of the coalbed methane well during the first gas production period, the first drainage parameter is the drainage parameter of the coalbed methane well during the first gas production period, and the second pressure parameter is the pressure parameter of the coalbed methane well at the beginning of the recovery period. The first gas production period refers to the period during which the coalbed methane well discharges gas under normal operating conditions. The beginning of the recovery period is the moment when the coalbed methane well begins to drain gas after shutdown. The end of the recovery period is the beginning of the second gas production period, which is the gas production period after the recovery period.

[0059] 102. Obtain the recovery time, the tubing diameter and casing diameter of the coalbed methane well.

[0060] The recovery time is the time required from the start of the recovery period to the start of the second exhaust period.

[0061] 103. Based on the first pressure parameter, the first drainage parameter, the second pressure parameter, the recovery time, the tubing diameter, and the casing diameter, obtain the second drainage parameter of the coalbed methane well during the recovery period.

[0062] The method provided in this application can quantify the pressure and drainage parameters of a coalbed methane well within different gas production periods, as well as a series of parameters including recovery time, tubing diameter, and casing diameter. Based on these parameters, the drainage parameters within the recovery period are determined, providing accurate data support for developing control plans in subsequent work. Subsequently, drainage of the coalbed methane well according to the drainage parameters within the recovery period can control the steady drainage and fluid reduction within the planned recovery time, guiding the well to quickly and orderly resume normal gas production, shortening recovery time, and improving the efficiency of resuming normal gas production after well shutdown. This avoids problems such as pump jamming caused by excessively high drainage parameters, and slow recovery of gas production caused by excessively low drainage parameters.

[0063] Figure 2 This is a flowchart of another method for determining sampling parameters provided in an embodiment of this application, applied to a computer device, which is a terminal or a server, such as... Figure 2 As shown, the method includes:

[0064] 201. Obtain the first pressure parameters, first drainage parameters, and second pressure parameters of the coalbed methane well.

[0065] Coalbed methane (CBM) wells are used to continuously depressurize and drain water, causing gas molecules adsorbed on the inner surface of the coal seam matrix pores to desorb. These molecules then seep through the matrix pores and diffuse into natural fractures, from which they seep back into the wellbore for discharge. The wellbore consists of tubing and casing. The tubing drains water from the well, while the gas produced is discharged through the annulus between the tubing and casing.

[0066] Among them, the gas produced by coalbed methane wells is coalbed methane, also known as coalbed methane, which is called coalbed gas in the coal industry. It is an unconventional natural gas formed during the coal formation process. Most of this natural gas exists in the coal seam matrix in an adsorbed state, a small amount exists in the pores and fissures of the coal seam in a free state, and a small amount is dissolved in the coal seam water.

[0067] Only when the bottom flow pressure of a coalbed methane well is continuously reduced to the desorption pressure of the gas can the gas be desorbed and produced. After the gas is desorbed and produced, the bottom flow pressure is further reduced to keep it below the desorption pressure until it is reduced to the same level as the wellhead pressure, so as to ensure continuous and stable desorption and production of gas, which is then discharged through the coalbed methane well.

[0068] However, during the production process of coalbed methane wells, shutdowns are inevitable due to factors such as power outages, equipment failures, and pump maintenance. Once a shutdown occurs, the bottomhole flowing pressure rises rapidly, which is detrimental to gas production and leads to a significant decrease in gas output. In cases of prolonged shutdown, the bottomhole flowing pressure can rise above the desorption pressure, preventing gas from desorbing from the matrix and causing the coalbed methane well to cease production. Once the shutdown problem is resolved, it is necessary to determine the drainage parameters for the recovery period and implement drainage according to these parameters to reduce the bottomhole flowing pressure and restore normal gas production.

[0069] If the drainage parameters are too high, the gas flow velocity will be excessive, easily leading to a large amount of pulverized coal being produced in a short period, causing pump jamming, or the increased pulverized coal concentration will clog local micro-fractures in the coal seam, resulting in decreased coal seam permeability, which is detrimental to gas production. If the drainage parameters are too low, the bottomhole pressure will decrease too slowly, failing to restore gas production in a timely manner and affecting the production operation plan of the coalbed methane well. Therefore, it is necessary to determine reasonable drainage parameters and restore normal gas production of the coalbed methane well based on these parameters.

[0070] Therefore, this application provides a method for determining drainage parameters. When a coalbed methane well experiences a shutdown during normal gas production, drainage parameters are determined, and drainage is performed according to these parameters to restore the coalbed methane well to its normal production state. In this application, the coalbed methane well is divided into multiple time periods, including at least a first gas production period, a shutdown period, a recovery period, and a second gas production period. These time periods are arranged sequentially from oldest to newest.

[0071] The first gas-producing period refers to the period during which gas is discharged from the coalbed methane well under normal operating conditions; the shutdown period is the period during which the coalbed methane well gradually develops to a state of no longer producing gas after a shutdown problem occurs; the start time of the recovery period is the moment when the coalbed methane well begins to drain gas after shutdown, and the end time of the recovery period is the start time of the second gas-producing period; the second gas-producing period is the gas-producing period after the recovery period, and the exhaust state reached in the second gas-producing period is basically the same as the exhaust state reached in the first gas-producing period.

[0072] First, the first pressure parameter, the first drainage parameter, and the second pressure parameter of the coalbed methane well are obtained. The first pressure parameter is the pressure parameter of the coalbed methane well during the first gas production period; the first drainage parameter is the drainage parameter of the coalbed methane well during the first gas production period; and the second pressure parameter is the pressure parameter of the coalbed methane well at the beginning of the recovery period.

[0073] Optionally, the pressure parameters include flowing pressure and casing pressure, where flowing pressure is the bottom hole pressure of the coalbed methane well and casing pressure is the casing pressure of the coalbed methane well. Obtaining the first pressure parameter, first drainage parameter, and second pressure parameter of the coalbed methane well includes: firstly, obtaining the drainage curve of the coalbed methane well; based on the drainage curve, obtaining the first pressure parameter and second pressure parameter; and then obtaining the first stroke and the first average daily drainage volume of the coalbed methane well as the first drainage parameter.

[0074] The drainage curve represents the relationship between drainage time and flowing pressure and casing pressure. The first pressure parameters include the first flowing pressure and the first casing pressure; the first flowing pressure is the bottom hole pressure of the coalbed methane well during the first gas production period, and the first casing pressure is the casing pressure of the coalbed methane well during the first gas production period. The second pressure parameters include the second flowing pressure and the second casing pressure at the beginning of the recovery period; the second flowing pressure is the bottom hole pressure of the coalbed methane well at the beginning of the recovery period, and the second casing pressure is the casing pressure of the coalbed methane well at the beginning of the recovery period. The first stroke represents the rotational speed of the drainage equipment during the first gas production period, and the first average daily drainage volume represents the average daily drainage volume of the coalbed methane well during the first gas production period.

[0075] For example, the drainage curve of a coalbed methane well is as follows: Figure 3As shown, curve 1 represents the bottom hole flowing pressure of the coalbed methane well, and curve 2 represents the casing pressure of the coalbed methane well. During the first gas production period, the first flowing pressure is P. L1 The first set is pressure P T1 The first gas production period is the normal gas production period of the coalbed methane well. During this period, the first flowing pressure P L1 With the first set of pressure P T1 It is relatively stable, and the first flow pressure P L1 With the first set of pressure P T1 The difference between them is also relatively stable. In the event of a well shutdown, the bottom hole flowing pressure of the coalbed methane well decreases from the first flowing pressure P. L1 Initially, it rises rapidly until it reaches the second flow pressure P. L2 So far, the first set of pressure P T1 Rapidly descend until reaching the second set of pressure P T2 Until then. At the first flow pressure P L1 Rebound to the second flow pressure P L2 And the first set of pressure P T1 Decrease to the second set of pressure P T2 During this process, the gas production of the coalbed methane well gradually decreases, and may even cease. Second flow pressure P L2 The highest point of the bottom-hole flowing pressure, the second pressure P T2 This is the lowest point of casing pressure. After the well shutdown issue is resolved, coalbed methane wells continue to be drained, entering a recovery period. During this recovery period, the bottom hole flowing pressure drops rapidly, and the casing pressure rises rapidly until both return to normal venting conditions. The second venting period is when the well returns to normal venting conditions.

[0076] 202. Obtain the recovery time, the tubing diameter and casing diameter of the coalbed methane well.

[0077] The drainage parameters during the recovery period are closely related to the recovery time. A longer recovery time results in smaller drainage parameters and a slower recovery rate, while a shorter recovery time leads to larger drainage parameters and a faster recovery rate. Furthermore, the tubing in a coalbed methane well is used to drain water from the well, and the produced gas is discharged through the annulus between the tubing and casing. Therefore, different tubing diameters or casing diameters in a coalbed methane well will also affect the drainage parameters during the recovery period to varying degrees.

[0078] Therefore, the recovery time, the tubing diameter, and the casing diameter of the coalbed methane well are obtained. The recovery time is the duration required from the start of the recovery period to the start of the second gas production period.

[0079] 203. Based on the first pressure parameter, the first drainage parameter, the second pressure parameter, the recovery time, the tubing diameter, and the casing diameter, obtain the second drainage parameter of the coalbed methane well during the recovery time period.

[0080] After obtaining the first pressure parameter, the first drainage parameter, the second pressure parameter, the recovery time, the tubing diameter, and the casing diameter, the second drainage parameter of the coalbed methane well during the recovery period is obtained based on the obtained first pressure parameter, first drainage parameter, second pressure parameter, recovery time, tubing diameter, and casing diameter.

[0081] The second drainage parameters include the second flush and the second average daily drainage volume.

[0082] Optionally, since the first pressure parameter includes the first flowing pressure and the first casing pressure, the first drainage parameter includes the first stroke and the first average daily drainage volume, and the second parameter includes the second stroke and the second average daily drainage volume, the process of obtaining the second drainage parameter of the coalbed methane well during the recovery period based on the first pressure parameter, the first drainage parameter, the second pressure parameter, the recovery time, the tubing diameter, and the casing diameter includes: obtaining the second stroke and the second average daily drainage volume of the coalbed methane well based on the first flowing pressure, the first casing pressure, the first stroke, the first average daily drainage volume, the second flowing pressure, the second casing pressure, the recovery time, the tubing diameter, and the casing diameter, and using the second stroke and the second average daily drainage volume as the second drainage parameter of the coalbed methane well.

[0083] The second stroke is used to indicate the rotational speed of the drainage equipment during the second gas output period, and the second average daily drainage volume is used to indicate the average daily drainage volume of the coalbed methane well during the second gas output period.

[0084] In another possible implementation, see Figure 4 The process of obtaining the second stroke and second average daily drainage of a coalbed methane well, based on the first flowing pressure, first casing pressure, first stroke, first average daily drainage, second flowing pressure, second casing pressure, recovery time, tubing diameter, and casing diameter, as the second drainage parameters of the coalbed methane well, includes:

[0085] The second flush and the second average daily discharge volume are obtained using the following formula:

[0086]

[0087]

[0088] Where V2 is the average daily drainage volume of the second day; V1 is the average daily drainage volume of the first day; P L1 The first flow pressure; P L2 For the second flow pressure; P T1 For the first set of pressure; P T2 D1 is the casing diameter; D2 is the tubing diameter; t is the recovery time; ρ is the liquid density; g is the gravitational acceleration; N2 is the second stroke; N1 is the first stroke.

[0089] It should be noted that the flowing pressure of a coalbed methane well is:

[0090] P L =P T +ρgh(3)

[0091] Among them, P L P is the bottom hole flowing pressure of a coalbed methane well. T This refers to the casing pressure of a coalbed methane well.

[0092] The average daily drainage volume during the recovery period was:

[0093]

[0094] Where Δh is the difference between the liquid level height h2 in the coalbed methane well at the start of the recovery period and the liquid level height h1 in the coalbed methane well during the first exhaust period, and S is the cross-sectional area of ​​the annulus between the tubing and the casing, as shown in the following formula:

[0095] Δh=h2-h1 (5)

[0096]

[0097] 204. The coalbed methane well is drained using the second stroke to obtain the third daily average drainage volume of the coalbed methane well.

[0098] After obtaining the second stroke, the drainage equipment uses the second stroke to drain the coalbed methane well, and obtains the third daily average drainage of the coalbed methane well. The third daily average drainage volume is the daily average drainage volume of the coalbed methane well when draining according to the second stroke during the recovery period.

[0099] 205. Obtain the difference between the average daily drainage volume of the third day and the average daily drainage volume of the second day.

[0100] In order to determine the accuracy of the second drainage parameters obtained by the method according to the embodiments of this application, after obtaining the third daily average drainage volume, the third daily average drainage volume can be compared with the second daily average drainage volume in the second drainage parameters to obtain the difference between the third daily average drainage volume and the second daily average drainage volume.

[0101] The difference is used to characterize the recovery effect of the coalbed methane well. A positive difference indicates that drainage can be carried out based on the drainage to restore the well to the normal gas production period as planned. The larger the difference, the shorter the time required to restore the well to the normal gas production period as planned, and the better the recovery effect. A negative difference indicates that drainage cannot be carried out based on the drainage to restore the well to the normal gas production period as planned. The smaller the difference, the longer the time required to restore the well to the normal gas production period as planned, and the worse the recovery effect.

[0102] Considering that drainage conditions may not accurately reflect the recovery of gas production, the effectiveness of the recovery operation can be further determined by observing the gas discharge level when the difference between the third and second drainage parameters is large.

[0103] The method provided in this application quantifies the pressure and drainage parameters of a coalbed methane well within different gas production periods, as well as a series of parameters including recovery time, tubing diameter, and casing diameter. Based on these parameters, the drainage parameters within the recovery period are determined, establishing a control plan for the recovery and drainage work of the coalbed methane well after shutdown, and providing accurate data support for subsequent work. Subsequently, drainage of the coalbed methane well according to the drainage parameters within the recovery period can control the steady drainage and stable liquid reduction within the planned recovery time, guiding the coalbed methane well to quickly and orderly resume normal gas production, shortening the recovery time, and improving the efficiency of resuming normal gas production after shutdown. This avoids problems such as pump jamming caused by excessively large drainage parameters, and slow recovery of gas production caused by excessively small drainage parameters.

[0104] In addition, the recovery effect can be determined based on the drainage situation of the coalbed methane well, the accuracy of the drainage and production parameters can be verified, and adjustments can be made in a timely manner based on the recovery effect and gas production situation to determine further adjustment plans.

[0105] It should be noted that the gas production of different coalbed methane wells varies. The method provided in this application embodiment can obtain the corresponding drainage and production parameters of any coalbed methane well during the recovery period after well shutdown, which can achieve a one-well-one-policy approach and is more targeted.

[0106] The method provided in the above-described embodiments is applied to coalbed methane well 1 in well area A. Coalbed methane well 1 was put into production in June 2017. It is a combined mine for No. 3 coal (No. 3 coal mine) and No. 15 coal (No. 15 coal mine). No. 3 coal is buried at a depth of 611m and has a thickness of 3.0m, while No. 15 coal is buried at a depth of 710m and has a thickness of 2.0m. The casing diameter of coalbed methane well 1 is D1 = 139.7mm, and the tubing diameter is D2 = 73mm. The first stroke during the first exhaust period is N1 = 5 strokes / min, and the daily gas production is Q = 4300m³. 3 (cubic meters), the average daily drainage volume V1 = 5 m³ 3 The first flow pressure P during the first exhaust time period L1 =0.4MPa (megapascals), corresponding to the first set of pressure P T1 =0.15MPa. This coalbed methane well No. 1 was shut down from April to July 2020 due to equipment failure, and preparations were underway to resume production with the second flowing pressure P... L2 =2MPa, corresponding to the second set of pressure P T2=0.1MPa, recovery time t=3d (day).

[0107] According to formula (1) in the above embodiment, the average daily drainage volume V2 during the recovery period is obtained as 5.6 m³. 3 According to formula (2) in the above embodiment, the second stroke N2 during the recovery period is obtained as 5.6 strokes / min.

[0108] The second flushing frequency of coalbed methane well 1 during the recovery period was adjusted to 5.6 flushes / min, and the actual measured average daily drainage volume was 5.8 m³. 3 The difference between this and the average daily drainage volume on the second day was 0.2m. 3 Gas production recovered to 4380 m³ on the fourth day of the recovery period. 3 The actual recovery time was less than 3 days, and the initial assessment was that the recovery effect was good and the gas production was stable.

[0109] The method provided in the above-described embodiments was applied to coalbed methane well 2 in well area B. Coalbed methane well 2 was put into production in March 2014, producing only No. 3 coal seam. The No. 3 coal seam is buried at a depth of 485m, with a thickness of 2.5m. The casing diameter D1 = 139.7mm, and the tubing diameter D2 = 73mm. The first stroke during the first exhaust period N1 = 4 strokes / min, and the daily gas production Q = 1500m³. 3 The average daily drainage volume V1 = 2m 3 The first flow pressure P during the first exhaust time period L1 =0.2MPa, corresponding to the first set of pressure P T1 =0.1MPa. From April 6th to 10th, 2020, this coalbed methane well 2 underwent pump inspection due to pulverized coal clogging. After the inspection, preparations were made to restore the second flow pressure P used during drainage. L2 =1.8MPa, corresponding to the second set of pressure P T2 =0.1MPa, recovery time t=1d.

[0110] According to formula (1) in the above embodiment, the average daily drainage volume V2 during the recovery period is obtained as 2.9m. 3 According to formula (2) in the above embodiment, the second stroke N2 during the recovery period is obtained as 5.8 strokes / min.

[0111] The second flushing rate of coalbed methane well 2 during the recovery period was adjusted to 5.8 flushes / min, and the actual measured average daily drainage volume was 2.7 m³. 3 The difference between this and the average daily drainage volume on the second day was -0.2m. 3 On the second day of the recovery period, gas production recovered to 1450 m³. 3 The actual recovery time was more than 1 day, and the initial assessment was that the recovery effect was slightly poor.

[0112] Figure 5 This is a schematic diagram of a device for determining sampling parameters provided in an embodiment of this application, as shown below. Figure 5 As shown, the device includes:

[0113] The first acquisition module 501 is used to acquire the first pressure parameter, the first drainage parameter, and the second pressure parameter of the coalbed methane well. The first pressure parameter is the pressure parameter of the coalbed methane well during the first gas production period. The first drainage parameter is the drainage parameter of the coalbed methane well during the first gas production period. The second pressure parameter is the pressure parameter of the coalbed methane well at the beginning of the recovery period. The first gas production period refers to the period during which the coalbed methane well discharges gas under normal working conditions. The beginning of the recovery period is the moment when the coalbed methane well begins to drain water after the well is shut down. The end of the recovery period is the beginning of the second gas production period. The second gas production period is the gas production period after the recovery period.

[0114] The second acquisition module 502 is used to acquire the recovery time, the tubing diameter and casing diameter of the coalbed methane well, and the recovery time is the time required from the start time of the recovery period to the start time of the second gas production period.

[0115] The parameter determination module 503 is used to obtain the second drainage parameters of the coalbed methane well during the recovery period based on the first pressure parameter, the first drainage parameter, the second pressure parameter, the recovery time, the tubing diameter, and the casing diameter.

[0116] The device provided in this application embodiment can quantify the pressure and drainage parameters of a coalbed methane well within different gas production periods, as well as a series of parameters including recovery time, tubing diameter, and casing diameter. Based on these parameters, the drainage parameters within the recovery period are determined, providing accurate data support for developing control plans in subsequent work. Subsequently, drainage of the coalbed methane well according to the drainage parameters within the recovery period can control the well to steadily drain water within the planned recovery time, stabilize the liquid reduction rate, guide the well to quickly and orderly restore normal gas production, shorten recovery time, and improve the efficiency of restoring normal gas production after well shutdown. It can avoid problems such as pump jamming caused by excessively large drainage parameters, and slow recovery of gas production caused by excessively small drainage parameters.

[0117] In one possible implementation, the first acquisition module 501 includes:

[0118] The curve acquisition unit 5011 is used to acquire the drainage curve of the coalbed methane well. The drainage curve is used to show the correspondence between drainage time and flowing pressure and casing pressure.

[0119] The pressure parameter acquisition unit 5012 is used to acquire the first pressure parameter and the second pressure parameter according to the drainage curve. The first pressure parameter includes the first flowing pressure and the first casing pressure, and the second pressure parameter includes the second flowing pressure and the second casing pressure at the beginning of the recovery period of the coalbed methane well.

[0120] The drainage parameter acquisition unit 5013 is used to acquire the first stroke and the first average daily drainage volume of the coalbed methane well as the first drainage parameters. The first stroke is used to represent the rotation speed of the drainage equipment during the first gas production period, and the first average daily drainage volume is used to represent the average daily drainage volume of the coalbed methane well during the first gas production period.

[0121] In another possible implementation, the parameter determination module 503 includes:

[0122] The drainage parameter acquisition unit 5031 is used to acquire the second stroke and the second average daily drainage of the coalbed methane well based on the first flowing pressure, the first casing pressure, the first stroke, the first average daily drainage, the second flowing pressure, the second casing pressure, the recovery time, the tubing diameter, and the casing diameter, and use these as the second drainage parameters of the coalbed methane well.

[0123] In another possible implementation, the parameter determination module 503 includes:

[0124] The drainage parameter acquisition unit 5031 is also used to obtain the second flush and the second average daily drainage volume using the following formula:

[0125]

[0126]

[0127] Where V2 is the average daily drainage volume of the second day; V1 is the average daily drainage volume of the first day; P L1 The first flow pressure; P L2 For the second flow pressure; P T1 For the first set of pressure; P T2 D1 is the casing diameter; D2 is the tubing diameter; t is the recovery time; ρ is the liquid density; g is the gravitational acceleration; N2 is the second stroke; N1 is the first stroke.

[0128] In another possible implementation, the second drainage parameters include the second stroke and the second average daily drainage volume; the apparatus also includes:

[0129] The drainage module 504 is used to drain the coalbed methane well using the second stroke and obtain the third average daily drainage volume of the coalbed methane well. The third average daily drainage volume is the average daily drainage volume of the coalbed methane well when it is drained according to the second stroke during the recovery period.

[0130] The difference acquisition module 505 is used to acquire the difference between the average daily drainage volume of the third day and the average daily drainage volume of the second day. The difference is used to characterize the recovery effect of the coalbed methane well.

[0131] Figure 6 This illustration shows a structural block diagram of a terminal 600 provided in an exemplary embodiment of this application. The terminal 600 can be a portable mobile terminal, such as a smartphone, tablet computer, MP3 player (Moving Picture Experts Group Audio Layer III), MP4 player (Moving Picture Experts Group Audio Layer IV), laptop computer, or desktop computer. The terminal 600 may also be referred to as a user device, portable terminal, laptop terminal, desktop terminal, or other names.

[0132] Terminal 600 includes a processor 601 and a memory 602.

[0133] Processor 601 may include one or more processing cores, such as a quad-core processor, an octa-core processor, etc. Processor 601 may be implemented using at least one hardware form selected from DSP (Digital Signal Processing), FPGA (Field-Programmable Gate Array), and PLA (Programmable Logic Array). Processor 601 may also include a main processor and a coprocessor. The main processor, also known as a CPU (Central Processing Unit), is used to process data in the wake-up state; the coprocessor is a low-power processor used to process data in the standby state. In some embodiments, processor 601 may integrate a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content to be displayed on the screen. In some embodiments, processor 601 may also include an AI (Artificial Intelligence) processor, which is used to handle computational operations related to machine learning.

[0134] The memory 602 may include one or more computer-readable storage media, which may be non-transitory. The memory 602 may also include high-speed random access memory and non-volatile memory, such as one or more disk storage devices or flash memory devices. In some embodiments, the non-transitory computer-readable storage media in the memory 602 are used to store at least one program code, which is executed by the processor 601 to implement the sampling parameter determination method provided in the method embodiments of this application.

[0135] In some embodiments, the terminal 600 may also optionally include a peripheral device interface 603 and at least one peripheral device. The processor 601, memory 602, and peripheral device interface 603 can be connected via a bus or signal line. Each peripheral device can be connected to the peripheral device interface 603 via a bus, signal line, or circuit board. Specifically, the peripheral device includes at least one of the following: a radio frequency circuit 604, a display screen 605, a camera assembly 606, an audio circuit 607, a positioning assembly 608, and a power supply 609.

[0136] Peripheral interface 603 can be used to connect at least one I / O (Input / Output) related peripheral device to processor 601 and memory 602. In some embodiments, processor 601, memory 602 and peripheral interface 603 are integrated on the same chip or circuit board; in some other embodiments, any one or two of processor 601, memory 602 and peripheral interface 603 can be implemented on separate chips or circuit boards, which is not limited in this embodiment.

[0137] The radio frequency (RF) circuit 604 is used to receive and transmit RF (Radio Frequency) signals, also known as electromagnetic signals. The RF circuit 604 communicates with communication networks and other communication devices via electromagnetic signals. The RF circuit 604 converts electrical signals into electromagnetic signals for transmission, or converts received electromagnetic signals back into electrical signals. Optionally, the RF circuit 604 includes: an antenna system, an RF transceiver, one or more amplifiers, a tuner, an oscillator, a digital signal processor, a codec chipset, a user identity module card, etc. The RF circuit 604 can communicate with other terminals through at least one wireless communication protocol. This wireless communication protocol includes, but is not limited to: the World Wide Web, metropolitan area networks, intranets, various generations of mobile communication networks (2G, 3G, 4G, and 5G), wireless local area networks, and / or WiFi (Wireless Fidelity) networks. In some embodiments, the RF circuit 604 may also include circuitry related to NFC (Near Field Communication), which is not limited in this application.

[0138] Display screen 605 is used to display a UI (User Interface). This UI may include graphics, text, icons, videos, and any combination thereof. When display screen 605 is a touch display screen, it also has the ability to collect touch signals on or above its surface. These touch signals can be input as control signals to processor 601 for processing. In this case, display screen 605 can also be used to provide virtual buttons and / or a virtual keyboard, also known as soft buttons and / or a soft keyboard. In some embodiments, there may be one display screen 605, disposed on the front panel of terminal 600; in other embodiments, there may be at least two display screens, disposed on different surfaces of terminal 600 or in a folded design; in other embodiments, display screen 605 may be a flexible display screen, disposed on a curved or folded surface of terminal 600. Furthermore, display screen 605 may be configured as a non-rectangular, irregular shape, i.e., a non-rectangular screen. Display screen 605 may be made of materials such as LCD (Liquid Crystal Display) or OLED (Organic Light-Emitting Diode).

[0139] The camera assembly 606 is used to acquire images or videos. Optionally, the camera assembly 606 includes a front-facing camera and a rear-facing camera. The front-facing camera is disposed on the front panel of the terminal, and the rear-facing camera is disposed on the back of the terminal. In some embodiments, there are at least two rear-facing cameras, which are any one of a main camera, a depth-sensing camera, a wide-angle camera, and a telephoto camera, to achieve background blurring by fusion of the main camera and the depth-sensing camera, panoramic shooting by fusion of the main camera and the wide-angle camera, VR (Virtual Reality) shooting, or other fusion shooting functions. In some embodiments, the camera assembly 606 may also include a flash. The flash may be a single-color temperature flash or a dual-color temperature flash. A dual-color temperature flash refers to a combination of a warm light flash and a cool light flash, which can be used for light compensation at different color temperatures.

[0140] The audio circuit 607 may include a microphone and a speaker. The microphone is used to collect sound waves from the user and the environment, converting the sound waves into electrical signals that are input to the processor 601 for processing, or input to the radio frequency circuit 604 for voice communication. For stereo sound acquisition or noise reduction purposes, multiple microphones may be used, each located at a different part of the terminal 600. The microphone may also be an array microphone or an omnidirectional microphone. The speaker is used to convert the electrical signals from the processor 601 or the radio frequency circuit 604 into sound waves. The speaker may be a conventional diaphragm speaker or a piezoelectric ceramic speaker. When the speaker is a piezoelectric ceramic speaker, it can convert electrical signals not only into audible sound waves but also into inaudible sound waves for purposes such as distance measurement. In some embodiments, the audio circuit 607 may also include a headphone jack.

[0141] The positioning component 608 is used to determine the current geographic location of the terminal 600 in order to enable navigation or LBS (Location Based Service). The positioning component 608 can be a positioning component based on the US GPS (Global Positioning System), China's BeiDou system, or Russia's Galileo system.

[0142] Power supply 609 is used to supply power to the various components in terminal 600. Power supply 609 can be AC ​​power, DC power, a disposable battery, or a rechargeable battery. When power supply 609 includes a rechargeable battery, the rechargeable battery can be a wired rechargeable battery or a wireless rechargeable battery. A wired rechargeable battery is a battery that is charged via a wired line, and a wireless rechargeable battery is a battery that is charged via a wireless coil. The rechargeable battery can also be used to support fast charging technology.

[0143] In some embodiments, the terminal 600 further includes one or more sensors 610. The one or more sensors 610 include, but are not limited to: an accelerometer 611, a gyroscope 612, a pressure sensor 88, a fingerprint sensor 614, an optical sensor 615, and a proximity sensor 616.

[0144] Accelerometer 611 can detect the magnitude of acceleration along the three coordinate axes of a coordinate system established by terminal 600. For example, accelerometer 611 can be used to detect the components of gravitational acceleration along the three coordinate axes. Processor 601 can control display screen 605 to display the user interface in either a landscape or portrait view based on the gravitational acceleration signal acquired by accelerometer 611. Accelerometer 611 can also be used for games or for acquiring user motion data.

[0145] The gyroscope sensor 612 can detect the orientation and rotation angle of the terminal 600. The gyroscope sensor 612, in conjunction with the accelerometer sensor 611, can collect 3D motion data from the user on the terminal 600. Based on the data collected by the gyroscope sensor 612, the processor 601 can perform the following functions: motion sensing (e.g., changing the UI based on the user's tilt), image stabilization during shooting, game control, and inertial navigation.

[0146] The pressure sensor 613 can be disposed on the side bezel of the terminal 600 and / or on the lower layer of the display screen 605. When the pressure sensor 613 is disposed on the side bezel of the terminal 600, it can detect the user's grip signal on the terminal 600, and the processor 601 can perform left / right hand recognition or quick operation based on the grip signal collected by the pressure sensor 613. When the pressure sensor 613 is disposed on the lower layer of the display screen 605, the processor 601 can control the operable controls on the UI interface based on the user's pressure operation on the display screen 605. The operable controls include at least one of button controls, scroll bar controls, icon controls, and menu controls.

[0147] The fingerprint sensor 614 is used to collect the user's fingerprint. The processor 601 identifies the user's identity based on the fingerprint collected by the fingerprint sensor 614, or the fingerprint sensor 614 identifies the user's identity based on the collected fingerprint. When the user's identity is identified as trusted, the processor 601 authorizes the user to perform relevant sensitive operations, including unlocking the screen, viewing encrypted information, downloading software, making payments, and changing settings. The fingerprint sensor 614 can be located on the front, back, or side of the terminal 600. When the terminal 600 has physical buttons or a manufacturer's logo, the fingerprint sensor 614 can be integrated with the physical buttons or manufacturer's logo.

[0148] An optical sensor 615 is used to collect ambient light intensity. In one embodiment, the processor 601 can control the display brightness of the display screen 605 based on the ambient light intensity collected by the optical sensor 615. Specifically, when the ambient light intensity is high, the display brightness of the display screen 605 is increased; when the ambient light intensity is low, the display brightness of the display screen 605 is decreased. In another embodiment, the processor 601 can also dynamically adjust the shooting parameters of the camera assembly 606 based on the ambient light intensity collected by the optical sensor 615.

[0149] A proximity sensor 616, also known as a distance sensor, is installed on the front panel of the terminal 600. The proximity sensor 616 is used to detect the distance between the user and the front of the terminal 600. In one embodiment, when the proximity sensor 616 detects that the distance between the user and the front of the terminal 600 is gradually decreasing, the processor 601 controls the display screen 605 to switch from a screen-on state to a screen-off state; when the proximity sensor 616 detects that the distance between the user and the front of the terminal 600 is gradually increasing, the processor 601 controls the display screen 605 to switch from a screen-off state to a screen-on state.

[0150] Those skilled in the art will understand that Figure 6 The structure shown does not constitute a limitation on terminal 600, and may include more or fewer components than shown, or combine certain components, or use different component arrangements.

[0151] Figure 7 This is a schematic diagram of a server structure provided in an embodiment of this application. The server 700 can vary significantly due to different configurations or performance. It may include one or more Central Processing Units (CPUs) 901 and one or more memories 702. The memories 702 store at least one line of program code, which is loaded and executed by the processor 701 to implement the methods provided in the above-described method embodiments. Of course, the server may also have wired or wireless network interfaces, a keyboard, and input / output interfaces for input and output. The server may also include other components for implementing device functions, which will not be elaborated upon here.

[0152] Server 700 can be used to perform the steps executed by the computer equipment in the above-mentioned method for determining sampling parameters.

[0153] This application also provides a computer device, which includes a processor and a memory. The memory stores at least one piece of program code, which is loaded and executed by the processor to implement the operations performed in the method for determining sampling parameters in the above embodiments.

[0154] This application also provides a computer-readable storage medium storing at least one piece of program code, which is loaded and executed by a processor to implement the operations performed in the sampling parameter determination method of the above embodiments.

[0155] This application also provides a computer program product or computer program, which includes computer program code stored in a computer-readable storage medium. A processor of a computer device reads the computer program code from the computer-readable storage medium and executes the computer program code, causing the computer device to perform the operations performed in the sampling parameter determination method of the above embodiments.

[0156] Those skilled in the art will understand that all or part of the steps of the above embodiments can be implemented by hardware or by a program instructing related hardware. The program can be stored in a computer-readable storage medium, such as a read-only memory, a disk, or an optical disk.

[0157] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present application should be included within the protection scope of the present application.

Claims

1. A method for determining drainage parameters, characterized in that, The method comprises: obtaining a production curve of a coalbed methane well, the production curve being used to represent a corresponding relationship between a production time and a flow pressure and a casing pressure; obtaining a first pressure parameter and a second pressure parameter according to the production curve, the first pressure parameter comprising a first flow pressure and a first casing pressure, and the second pressure parameter comprising a second flow pressure and a second casing pressure at a starting moment of a recovery time period of the coalbed methane well; the first pressure parameter being a pressure parameter of the coalbed methane well at a first gas discharge time period, and the second pressure parameter being a pressure parameter of the coalbed methane well at the starting moment of the recovery time period, wherein the first gas discharge time period refers to a time period of discharging gas in a normal working state of the coalbed methane well, the starting moment of the recovery time period refers to a moment of starting to discharge water after the coalbed methane well is stopped, and an ending moment of the recovery time period refers to a starting moment of a second gas discharge time period, and the second gas discharge time period is a gas discharge time period after the recovery time period; obtaining a first stroke frequency and a first daily average discharge amount of the coalbed methane well as first production parameters, the first stroke frequency being used to represent a rotating speed of a water discharge device in the first gas discharge time period, and the first daily average discharge amount being used to represent a daily average discharge amount of the coalbed methane well in the first gas discharge time period; obtaining a recovery time length, a tubing diameter and a casing diameter of the coalbed methane well, the recovery time length being a time length required from the starting moment of the recovery time period to the starting moment of the second gas discharge time period; obtaining a second stroke frequency and a second daily average discharge amount of the coalbed methane well as second production parameters of the coalbed methane well in the recovery time period according to the first flow pressure, the first casing pressure, the first stroke frequency, the first daily average discharge amount, the second flow pressure, the second casing pressure, the recovery time length, the tubing diameter and the casing diameter by using the following formula: wherein V2 is the second daily displacement; V1 is the first daily displacement; P L1 is the first flow pressure; P L2 is the second flow pressure; P T1 is the first casing pressure; P T2 is the second casing pressure; D1 is the casing diameter; D2 is the tubing diameter; t is the recovery time; The method further comprises: is the liquid density; g is the gravitational acceleration; N2 is the second stroke frequency; N1 is the first stroke frequency.

2. The method of claim 1, wherein, discharging gas from the coalbed methane well by using the second stroke frequency, and obtaining a third daily average discharge amount of the coalbed methane well, the third daily average discharge amount being a daily average discharge amount of the coalbed methane well when discharging gas according to the second stroke frequency in the recovery time period; obtaining a difference value between the third daily average discharge amount and the second daily average discharge amount, the difference value being used to represent a recovery effect of the coalbed methane well. The device comprises:

3. A device for determining drainage parameters, characterized in that ​ The first acquisition module is configured to acquire a production curve of the coalbed methane well, the production curve being used to represent a corresponding relationship between a production time and a flow pressure and a casing pressure; acquire a first pressure parameter and a second pressure parameter according to the production curve, the first pressure parameter including a first flow pressure and a first casing pressure, and the second pressure parameter including a second flow pressure and a second casing pressure at a starting moment of a recovery time period of the coalbed methane well; the first pressure parameter is a pressure parameter of the coalbed methane well at a first gas discharge time period, and the second pressure parameter is a pressure parameter of the coalbed methane well at the starting moment of the recovery time period, wherein the first gas discharge time period refers to a time period of discharging gas in a normal working state of the coalbed methane well, the starting moment of the recovery time period refers to a moment of starting to discharge water after the coalbed methane well is stopped, an ending moment of the recovery time period refers to a starting moment of a second gas discharge time period, and the second gas discharge time period is a gas discharge time period after the recovery time period; acquire a first stroke frequency and a first daily average water discharge amount of the coalbed methane well as first production parameters, the first stroke frequency being used to represent a rotating speed of a water discharge device in the first gas discharge time period, and the first daily average water discharge amount being used to represent a daily average water discharge amount of the coalbed methane well in the first gas discharge time period, and the first production parameters being production parameters of the coalbed methane well in the first gas discharge time period; The second acquisition module is configured to acquire a recovery time length, a tubing diameter and a casing diameter of the coalbed methane well, the recovery time length being a time length required from the starting moment of the recovery time period to the starting moment of the second gas discharge time period; The parameter determination module is configured to acquire a second stroke frequency and a second daily average water discharge amount of the coalbed methane well as second production parameters of the coalbed methane well in the recovery time period according to the first flow pressure, the first casing pressure, the first stroke frequency, the first daily average water discharge amount, the second flow pressure, the second casing pressure, the recovery time length, the tubing diameter and the casing diameter, by using the following formula: wherein V2 is the second daily displacement; V1 is the first daily displacement; P L1 is the first flow pressure; P L2 is the second flow pressure; P T1 is the first casing pressure; P T2 is the second casing pressure; D1 is the casing diameter; D2 is the tubing diameter; t is the recovery time; The computer device includes a processor and a memory, the memory storing at least one program code, the at least one program code being loaded and executed by the processor to implement operations performed in the production parameter determination method according to any one of claims 1-2. is the liquid density; g is the gravitational acceleration; N2 is the second stroke frequency; N1 is the first stroke frequency.

4. A computer device, comprising: The computer readable storage medium stores at least one program code, the at least one program code being loaded and executed by the processor to implement operations performed in the production parameter determination method according to any one of claims 1-2.

5. A computer readable storage medium, characterized in that, ​

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