CN112528455A - Method and system for calculating reservoir pressure and dynamic reserve of adsorption unsaturated coal-bed gas well - Google Patents
Method and system for calculating reservoir pressure and dynamic reserve of adsorption unsaturated coal-bed gas well Download PDFInfo
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Abstract
The invention provides a method and a system for calculating reservoir pressure and dynamic reserve of an adsorption unsaturated coal bed gas well, wherein the method comprises the following steps: acquiring basic data; determining critical desorption pressure to obtain the original gas content value of the coal bed; determining the gas leakage area of the coal bed gas well through actual well pattern development, fracturing cracks and production conditions, and obtaining the original geological reserve of the coal bed gas well; calculating to obtain the current reservoir pressure of the coal-bed gas well; and if the coal-bed gas well has actually-measured reservoir pressure data, fitting the current reservoir pressure of the coal-bed gas well by repeatedly adjusting the original geological reserve of the coal-bed gas well, obtaining the actual control dynamic reserve of the coal-bed gas well, and predicting the later reservoir pressure of the coal-bed gas well. The method has the advantages of simple steps, wide applicability and less required data, is suitable for saturated or unsaturated coal beds with different coal ranks and different types, is also suitable for different development modes and well types, can accurately predict the development dynamics of the coal-bed gas well, and provides reliable basis for subsequent development adjustment and implementation of yield-increasing measures.
Description
Technical Field
The invention relates to the technical field of evaluation of reservoir pressure and dynamic reserve in the production process of a coal-bed gas well, in particular to a method and a system for calculating the reservoir pressure and the dynamic reserve of an adsorption unsaturated coal-bed gas well.
Background
The research on reservoir pressure and dynamic reserves in the production process of the coal-bed gas well is of great significance, the change rule of the reservoir pressure and dynamic reserves is mastered, the pressure drop level, the interwell interference condition, the gas supply capacity, the residual geological reserves, the recovery ratio and the like of the coal-bed gas well can be analyzed, the dynamic analysis and the optimization adjustment of the coal-bed gas well (field) are guided, and the development benefit is improved.
The existing method for acquiring the reservoir pressure and the dynamic reserve of the coal-bed gas well mainly comprises a direct measurement method, a numerical simulation method, a yield instability analysis method and the like, but obvious inadaptability exists.
Because the permeability and the pressure of the domestic coal bed are low, the direct method has long testing time, high cost and poor accuracy, and meanwhile, in order to avoid damage, the domestic coal bed gas drainage and production process is required to be uninterrupted, so that the domestic coal bed gas development well almost rarely carries out reservoir pressure testing. The numerical simulation, the material balance method, the yield instability analysis method and the like need to establish a model, so that a large amount of time and workload are consumed, a large amount of reservoir information is needed, and parameters such as compression coefficients, water saturation and the like are difficult to obtain and the accuracy is low. Work is mainly carried out on saturated coal bed gas reservoirs abroad, and the existing domestic development block is mainly an unsaturated coal bed gas reservoir and cannot apply foreign technologies.
Therefore, a technical scheme for evaluating reservoir pressure and dynamic reserves of unsaturated coalbed methane reservoirs is needed.
Disclosure of Invention
In order to solve the problems, the invention provides a method and a system for calculating the reservoir pressure and the dynamic reserve of the adsorption unsaturated coal-bed gas well, which can realize the reservoir pressure and the dynamic reserve evaluation in the development process of the low-permeability and unsaturated coal-bed gas reservoir, and have simple calculation process and wider applicability.
In an embodiment of the invention, a method for calculating reservoir pressure and dynamic reserve of an adsorption unsaturated coal-bed gas well is provided, and the method comprises the following steps:
acquiring basic data of a coal bed gas well;
determining critical desorption pressure according to basic data of the coal-bed gas well, and obtaining an original gas content value of the coal bed according to the critical desorption pressure;
determining the gas leakage area of the coal-bed gas well through actual well pattern development, fracturing cracks and production conditions according to the original gas content value of the coal bed and basic data of the coal-bed gas well, and obtaining the original geological reserve of the coal-bed gas well;
obtaining the current reservoir pressure of the coal-bed gas well according to the basic data, the critical desorption pressure and the original geological reserve of the coal-bed gas well;
and if the coal-bed gas well has the actually measured reservoir pressure data, fitting the current reservoir pressure of the coal-bed gas well by repeatedly adjusting the original geological reserve of the coal-bed gas well according to the actually measured reservoir pressure data, obtaining the actually controlled dynamic reserve of the coal-bed gas well after fitting, and predicting the later reservoir pressure of the coal-bed gas well.
In another embodiment of the present invention, a system for calculating reservoir pressure and dynamic reserve of an adsorption unsaturated coal bed gas well is further provided, the system comprising:
the data acquisition module is used for acquiring basic data of the coal bed gas well;
the gas content calculation module is used for determining critical desorption pressure according to basic data of the coal-bed gas well and obtaining an original gas content value of the coal bed according to the critical desorption pressure;
the original geological reserve calculation module is used for determining the gas leakage area of the coal-bed gas well according to the original gas content value of the coal bed and basic data of the coal-bed gas well through actual well pattern development, fracturing cracks and production conditions to obtain the original geological reserve of the coal-bed gas well;
the reservoir pressure calculation module is used for obtaining the current reservoir pressure of the coal-bed gas well according to the basic data of the coal-bed gas well, the critical desorption pressure and the original geological reserve of the coal-bed gas well;
and the reservoir pressure prediction module is used for fitting the current reservoir pressure of the coal-bed gas well by repeatedly adjusting the original geological reserve of the coal-bed gas well according to the actually measured reservoir pressure data under the condition that the coal-bed gas well has actually measured reservoir pressure data, obtaining the actual control dynamic reserve of the coal-bed gas well after fitting, and predicting the reservoir pressure at the later stage of the coal-bed gas well.
In another embodiment of the present invention, a computer device is further provided, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor executes the computer program to implement the method for calculating the reservoir pressure and dynamic reserve of the adsorption unsaturated coalbed methane well.
In another embodiment of the invention, a computer readable storage medium is further provided, and the computer readable storage medium stores a computer program for executing the method for calculating the reservoir pressure and dynamic reserve of the adsorption unsaturated coalbed methane well.
Compared with other methods for acquiring the reservoir pressure and the dynamic reserve of the coal-bed gas well, the method and the system for calculating the reservoir pressure and the dynamic reserve of the adsorption unsaturated coal-bed gas well have the advantages of simplicity, applicability, less required data, low cost and the like. The method and the system are suitable for saturated or unsaturated coal beds with different coal ranks and different types, and are also suitable for different development modes and development well types; the method can quickly calculate and predict the reservoir pressure of a single well in the gas production life cycle of the coal bed gas, can also perform fitting calculation on the coal bed gas well subjected to overpressure testing through iterative calculation, improves the pressure prediction accuracy, simultaneously obtains parameters such as the actual control dynamic reserve volume and the gas leakage area (radius) of the coal bed gas, and can accurately predict the development dynamics of the coal bed gas well (field) by combining with methods such as numerical simulation, gas reservoir engineering analysis and the like, thereby providing a reliable basis for subsequent development adjustment and production increase measure implementation.
Drawings
Fig. 1 is a flow chart of a method for calculating reservoir pressure and dynamic reserve of an adsorption unsaturated coalbed methane well according to an embodiment of the invention.
Fig. 2 is a calculated plot of the critical desorption pressure of a coal-bed gas well in accordance with an embodiment of the present invention.
FIG. 3 is a fitting graph of measured reservoir pressure for a coalbed methane well in accordance with an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a system for calculating reservoir pressure and dynamic reserve of an adsorption unsaturated coalbed methane well according to an embodiment of the invention.
FIG. 5 is a diagram illustrating computer device relationships, in accordance with an embodiment of the present invention.
Detailed Description
The principles and spirit of the present invention will be described with reference to a number of exemplary embodiments. It is understood that these embodiments are given solely for the purpose of enabling those skilled in the art to better understand and to practice the invention, and are not intended to limit the scope of the invention in any way. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
As will be appreciated by one skilled in the art, embodiments of the present invention may be embodied as a system, apparatus, device, method, or computer program product. Accordingly, the present disclosure may be embodied in the form of: entirely hardware, entirely software (including firmware, resident software, micro-code, etc.), or a combination of hardware and software.
According to the embodiment of the invention, a method and a system for calculating the reservoir pressure and dynamic reserve of an adsorption unsaturated coal-bed gas well are provided.
The principles and spirit of the present invention are explained in detail below with reference to several representative embodiments of the invention.
Fig. 1 is a flow chart of a method for calculating reservoir pressure and dynamic reserve of an adsorption unsaturated coalbed methane well according to an embodiment of the invention. As shown in fig. 1, the method includes:
step S1, acquiring basic data of the coal bed gas well; the basic data of the coal bed gas well can comprise: production history data, langmuir pressure and langmuir volume; wherein the production history data comprises: the bottom hole flowing pressure and the accumulated gas production rate of the coal-bed gas well.
In one embodiment, it is desirable to obtain reliable basic data for a gas producing well of coal bed methane, such as basic parameters of coal bed thickness, coal rock density, production history data (daily gas production, casing pressure, working fluid level, bottom hole pressure, cumulative gas production, etc.), langmuir pressure, langmuir volume, etc.
The coal bed gas producing well comprises all well types such as a vertical well, a cluster well, a horizontal well and the like.
The coal seam thickness and coal rock density data can be obtained from well drilling and logging data.
The daily gas production, the casing pressure and the accumulated gas production data are recorded in an original production report.
Langmuir pressure and Langmuir volume are obtained from isothermal adsorption experiments on coal rock cores, and if the well does not have the test data, the values of the data of adjacent wells in the block can be referred.
And step S2, determining critical desorption pressure according to the basic data of the coal bed gas well, and obtaining the original gas content value of the coal bed according to the critical desorption pressure.
Specifically, the critical desorption pressure may be determined from production history data, and the bottom hole flow pressure of the day before casing pressure occurs is used as the critical desorption pressure.
It should be noted that the bottom hole flowing pressure can be directly read by a pressure gauge which is lowered into the coal bed gas well, or obtained by converting annular working fluid level and casing pressure data in the coal bed gas well shaft.
Further, calculating the original gas content value of the coal bed by using the formula (1-1):
wherein, VM is the original gas content value of the coal bed3/t；VLIs the Langmuir volume, m3/t；PCCritical desorption pressure, MPa; pLLangmuir pressure, MPa.
And step S3, determining the gas leakage area of the coal-bed gas well through actual well pattern development, fracturing cracks and production conditions according to the original gas content value of the coal bed and the basic data of the coal-bed gas well, and obtaining the original geological reserve of the coal-bed gas well.
Specifically, after the gas leakage area of the coal-bed gas well is obtained, the original geological reserve of the coal-bed gas well can be calculated by adopting a volume method according to the gas leakage area of the coal-bed gas well.
Determining the gas leakage area of the coal bed gas well through actual well pattern development, fracturing fracture data, production conditions and the like, wherein the gas leakage area of the coal bed gas well is generally estimated according to actual well spacing when the coal bed gas well is in an early production stage and the dynamic data is less, and certain correction is carried out according to comparison between the fracturing fracture monitoring result and the gas production amount;
when the coal bed gas well is in the descending stage in the middle and later production stages and has more dynamic data, the air leakage area can be comprehensively determined by combining the results of modern yield descending analysis.
And step S4, obtaining the current reservoir pressure of the coal-bed gas well according to the basic data of the coal-bed gas well, the critical desorption pressure and the original geological reserve of the coal-bed gas well.
Specifically, the execution process of this step may be performed under the condition that no actually measured reservoir pressure data exists in the coal-bed gas producing well, and the current reservoir pressure of the coal-bed gas well is directly calculated by substituting the accumulated gas production rate, the critical desorption pressure, the original geological reserve of the coal-bed gas well and the langmuir pressure data obtained in steps S1, S2 and S3 into formula (1-2).
Wherein P is the current reservoir pressure of the coal-bed gas well, MPa; pLLangmuir pressure, MPa; pCIs critical desorption pressureForce, MPa; GIIP is the original geological reserve of the coal-bed gas well, 106m3；GPFor the accumulated gas production of coal bed gas wells, 106m3。
And step S5, if the coal-bed gas well has the actually measured reservoir pressure data, fitting the current reservoir pressure of the coal-bed gas well by repeatedly adjusting the original geological reserve of the coal-bed gas well according to the actually measured reservoir pressure data, obtaining the actually controlled dynamic reserve of the coal-bed gas well after fitting, and predicting the reservoir pressure at the later stage of the coal-bed gas well.
In a specific embodiment, based on the step S4, if the coal-bed gas well has the measured reservoir pressure data, the coal-bed gas well reservoir pressure calculated in the step S4 may be fitted with the measured pressure value, and the original geological reserve of the coal-bed gas well is repeatedly adjusted to obtain a good fitting result. After fitting, the actual control dynamic reserves of the coal-bed gas well can be obtained, and then the formula (1-2) is replaced, so that the reservoir pressure in the later period can be calculated and predicted.
The fitting calculation has multiple advantages, firstly, whether the calculated reservoir pressure is accurate can be verified, secondly, the actual control dynamic reserve and the actual gas leakage area (radius) of the coal-bed gas well can be obtained, and real dynamic parameters of the coal-bed gas well can be obtained through comparison and analysis with the calculation results of a numerical simulation method, gas reservoir engineering analysis and the like, so that a direct basis is provided for dynamic analysis and adjustment.
It should be noted that although the operations of the method of the present invention have been described in the above embodiments and the accompanying drawings in a particular order, this does not require or imply that these operations must be performed in this particular order, or that all of the operations shown must be performed, to achieve the desired results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions.
For a clearer explanation of the method for calculating the reservoir pressure and dynamic reserve of the adsorption-unsaturated coalbed methane well, a specific example is provided below, but it should be noted that the example is only for better illustration of the present invention and is not to be construed as an undue limitation on the present invention.
For a certain area as an example, first, in conjunction with step S1, reliable basic data of the coalbed methane gas producing well in the area is obtained.
And (4) combining the step S2, making a drainage and production curve according to the historical production data of the coal bed gas producing well obtained in the step S1, and as shown in FIG. 2, substituting the critical desorption pressure into formula (1-1) by taking the bottom hole flow pressure of the day before casing pressure appears in the drainage and production curve as the critical desorption pressure, and calculating to obtain the original gas content value of the coal bed.
And step S3 is combined, the gas leakage area of the coal bed gas well is comprehensively determined according to the actual development well pattern, the fracturing fracture data, the production condition and the like, and the original geological reserve of the coal bed gas well is calculated.
And (5) calculating the current reservoir pressure of the coal-bed gas well by adopting a material balance method according to the Langmuir isothermal adsorption equation deformation formula, namely the formula (1-2) in combination with the step S4.
Finally, according to the step S5, if the coal-bed gas well has the actually measured reservoir pressure in the early production stage, the original geological reserve of the coal-bed gas well is adjusted repeatedly, the reservoir pressure is calculated iteratively according to the step S4, the actually measured reservoir pressure is fitted as shown in FIG. 3, the actually controlled dynamic reserve of the coal-bed gas well is obtained after fitting, and then the reservoir pressure in the later production stage is predicted according to the step S4.
Based on the same inventive concept, the invention also provides a system for calculating the reservoir pressure and the dynamic reserve of the adsorption unsaturated coal-bed gas well, as shown in fig. 4, the system comprises:
the data acquisition module 410 is used for acquiring basic data of the coal bed gas well;
the gas content calculation module 420 is configured to determine a critical desorption pressure according to the basic data of the coal-bed gas well, and obtain an original gas content value of the coal bed according to the critical desorption pressure;
the original geological reserve calculation module 430 is used for determining the gas leakage area of the coal-bed gas well according to the original gas content value of the coal bed and the basic data of the coal-bed gas well through actual well pattern development, fracturing cracks and production conditions, and obtaining the original geological reserve of the coal-bed gas well;
the reservoir pressure calculation module 440 is used for obtaining the current reservoir pressure of the coal-bed gas well according to the basic data of the coal-bed gas well, the critical desorption pressure and the original geological reserve of the coal-bed gas well;
and the reservoir pressure prediction module 450 is configured to, under the condition that the coal-bed gas well has actually measured reservoir pressure data, fit the current reservoir pressure of the coal-bed gas well by repeatedly adjusting the original geological reserve of the coal-bed gas well according to the actually measured reservoir pressure data, obtain the actual control dynamic reserve of the coal-bed gas well after fitting, and predict the reservoir pressure at the later stage of the coal-bed gas well.
It should be noted that although several modules of the adsorbed unsaturated coalbed methane well reservoir pressure and dynamic reserve calculation system are mentioned in the above detailed description, such partitioning is merely exemplary and not mandatory. Indeed, the features and functionality of two or more of the modules described above may be embodied in one module according to embodiments of the invention. Conversely, the features and functions of one module described above may be further divided into embodiments by a plurality of modules.
Based on the same inventive concept, the present invention further provides a computer apparatus 500, as shown in fig. 5, including a memory 510, a processor 520, and a computer program 530 stored in the memory 510 and executable on the processor 520, where the processor 520 executes the computer program 530 to implement a method for calculating a reservoir pressure and a dynamic reserve of an adsorption unsaturated coal-bed gas well.
Based on the same inventive concept, the invention also provides a computer readable storage medium, which stores a computer program for executing the method for calculating the reservoir pressure and the dynamic reserve of the adsorption unsaturated coal-bed gas well.
Compared with other methods for acquiring the reservoir pressure and the dynamic reserve of the coal-bed gas well, the method and the system for calculating the reservoir pressure and the dynamic reserve of the adsorption unsaturated coal-bed gas well have the advantages of simplicity, applicability, less required data, low cost and the like. The method and the system are suitable for saturated or unsaturated coal beds with different coal ranks and different types, and are also suitable for different development modes and development well types; the method can quickly calculate and predict the reservoir pressure of a single well in the gas production life cycle of the coal bed gas, can also perform fitting calculation on the coal bed gas well subjected to overpressure testing through iterative calculation, improves the pressure prediction accuracy, simultaneously obtains parameters such as the actual control dynamic reserve volume and the gas leakage area (radius) of the coal bed gas, and can accurately predict the development dynamics of the coal bed gas well (field) by combining with methods such as numerical simulation, gas reservoir engineering analysis and the like, thereby providing a reliable basis for subsequent development adjustment and production increase measure implementation.
While the spirit and principles of the invention have been described with reference to several particular embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, nor is the division of aspects, which is for convenience only as the features in such aspects may not be combined to benefit. The invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (10)
1. A method for calculating reservoir pressure and dynamic reserve of an adsorption unsaturated coal-bed gas well is characterized by comprising the following steps:
acquiring basic data of a coal bed gas well;
determining critical desorption pressure according to basic data of the coal-bed gas well, and obtaining an original gas content value of the coal bed according to the critical desorption pressure;
determining the gas leakage area of the coal-bed gas well through actual well pattern development, fracturing cracks and production conditions according to the original gas content value of the coal bed and basic data of the coal-bed gas well, and obtaining the original geological reserve of the coal-bed gas well;
obtaining the current reservoir pressure of the coal-bed gas well according to the basic data, the critical desorption pressure and the original geological reserve of the coal-bed gas well;
and if the coal-bed gas well has the actually measured reservoir pressure data, fitting the current reservoir pressure of the coal-bed gas well by repeatedly adjusting the original geological reserve of the coal-bed gas well according to the actually measured reservoir pressure data, obtaining the actually controlled dynamic reserve of the coal-bed gas well after fitting, and predicting the later reservoir pressure of the coal-bed gas well.
2. The method for calculating the reservoir pressure and the dynamic reserve of the adsorption unsaturated coal-bed gas well according to claim 1, wherein the step of obtaining basic data of the coal-bed gas well comprises the following steps: production history data, langmuir pressure and langmuir volume;
wherein the production history data comprises: the bottom hole flowing pressure and the accumulated gas production rate of the coal-bed gas well.
3. The method for calculating reservoir pressure and dynamic reserve of an adsorption unsaturated coal-bed gas well according to claim 2, wherein a critical desorption pressure is determined according to basic data of the coal-bed gas well, and an original gas content value of the coal bed is obtained according to the critical desorption pressure, and the method comprises the following steps:
and determining the critical desorption pressure according to the production historical data, and taking the bottom hole flow pressure of the day before the casing pressure appears as the critical desorption pressure.
4. The method for calculating the reservoir pressure and the dynamic reserve of the adsorption unsaturated coal-bed gas well according to claim 3, characterized by determining a critical desorption pressure according to basic data of the coal-bed gas well, and obtaining an original gas content value of the coal bed according to the critical desorption pressure, wherein the original gas content value of the coal bed is calculated by using the following formula:
wherein V is the original gas content value of the coal bed, m3/t；VLIs the Langmuir volume, m3/t；PCCritical desorption pressure, MPa; pLLangmuir pressure, MPa.
5. The method for calculating the reservoir pressure and the dynamic reserve of the adsorption unsaturated coal-bed gas well according to the claim 4, wherein the method for obtaining the original geological reserve of the coal-bed gas well by determining the gas leakage area of the coal-bed gas well through actual well pattern development, fracturing fracture and production conditions according to the original gas content value of the coal bed and the basic data of the coal-bed gas well comprises the following steps:
and calculating to obtain the original geological reserve of the coal-bed gas well by adopting a volume method according to the air leakage area of the coal-bed gas well.
6. The method for calculating the reservoir pressure and the dynamic reserve of the adsorption unsaturated coal-bed gas well according to the claim 5, wherein the step of obtaining the current reservoir pressure of the coal-bed gas well according to the basic data, the critical desorption pressure and the original geological reserve of the coal-bed gas well comprises the following steps:
calculating the current reservoir pressure of the coal-bed gas well according to the Langmuir isothermal adsorption equation deformation formula by adopting a material balance method, wherein the formula is as follows:
wherein P is the current reservoir pressure of the coal-bed gas well, MPa; pLLangmuir pressure, MPa; pCCritical desorption pressure, MPa; GIIP is the original geological reserve of the coal-bed gas well, 106m3；GPFor the accumulated gas production of coal bed gas wells, 106m3。
7. The method for calculating the reservoir pressure and dynamic reserve of the adsorption unsaturated coal-bed gas well according to claim 6, wherein if the coal-bed gas well has measured reservoir pressure data, fitting the current reservoir pressure of the coal-bed gas well by repeatedly adjusting the original geological reserve of the coal-bed gas well according to the measured reservoir pressure data, obtaining the actual control dynamic reserve of the coal-bed gas well after fitting, and predicting the reservoir pressure at the later stage of the coal-bed gas well comprises:
for the coal bed gas well with actually measured reservoir pressure data, iteratively calculating the current reservoir pressure of the coal bed gas well and fitting an actual measured value by repeatedly adjusting the original geological reserve of the coal bed gas well, and obtaining the actual control dynamic reserve and the air leakage area of the coal bed gas well after fitting;
and predicting the later reservoir pressure of the coal-bed gas well according to the actual control dynamic reserve and the gas leakage area of the coal-bed gas well.
8. An adsorption unsaturated coal bed gas well reservoir pressure and dynamic reserve calculation system is characterized by comprising:
the data acquisition module is used for acquiring basic data of the coal bed gas well;
the gas content calculation module is used for determining critical desorption pressure according to basic data of the coal-bed gas well and obtaining an original gas content value of the coal bed according to the critical desorption pressure;
the original geological reserve calculation module is used for determining the gas leakage area of the coal-bed gas well according to the original gas content value of the coal bed and basic data of the coal-bed gas well through actual well pattern development, fracturing cracks and production conditions to obtain the original geological reserve of the coal-bed gas well;
the reservoir pressure calculation module is used for obtaining the current reservoir pressure of the coal-bed gas well according to the basic data of the coal-bed gas well, the critical desorption pressure and the original geological reserve of the coal-bed gas well;
and the reservoir pressure prediction module is used for fitting the current reservoir pressure of the coal-bed gas well by repeatedly adjusting the original geological reserve of the coal-bed gas well according to the actually measured reservoir pressure data under the condition that the coal-bed gas well has actually measured reservoir pressure data, obtaining the actual control dynamic reserve of the coal-bed gas well after fitting, and predicting the reservoir pressure at the later stage of the coal-bed gas well.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any one of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the method of any one of claims 1 to 7.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113153274A (en) * | 2021-04-30 | 2021-07-23 | 中国矿业大学 | Deep coal seam in-situ gas content measuring method |
| CN113464129A (en) * | 2021-08-03 | 2021-10-01 | 中国石油大学(北京) | Method and device for calculating average formation pressure of coal bed gas reservoir |
| CN113605879A (en) * | 2021-08-02 | 2021-11-05 | 中国石油大学(北京) | Method and device for calculating original formation pressure of coal reservoir |
| CN114293974A (en) * | 2022-01-07 | 2022-04-08 | 中海石油(中国)有限公司 | Method and system for determining original gas content of coal bed gas development well |
| CN117266804A (en) * | 2023-11-13 | 2023-12-22 | 东营中威石油技术服务有限公司 | Jet pump drainage control method and system |
| CN118333413A (en) * | 2024-01-31 | 2024-07-12 | 中国石油天然气股份有限公司 | Coalbed methane well productivity evaluation method and device, storage medium and electronic equipment |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050194133A1 (en) * | 2003-02-28 | 2005-09-08 | Yates Petroleum Corporation | Methods of evaluating undersaturated coalbed methane reservoirs |
| CN104632187A (en) * | 2013-11-14 | 2015-05-20 | 中国石油化工股份有限公司 | Method for determining dynamic reserve volume of water production coal seam gas well |
| CN106481332A (en) * | 2015-08-31 | 2017-03-08 | 中国石油化工股份有限公司 | Method for determining area's dynamic holdup inside and outside shale gas multistage pressure break horizontal well |
| CN106484933A (en) * | 2015-08-31 | 2017-03-08 | 中国石油化工股份有限公司 | A kind of method and system for determining shale gas well well control dynamic holdup |
| CN107066674A (en) * | 2017-01-18 | 2017-08-18 | 西南石油大学 | The method for calculating shale gas reservoir volume fracturing horizontal well unstable state yield |
| CN107806916A (en) * | 2017-09-11 | 2018-03-16 | 中国石油天然气股份有限公司 | Method and device for determining reservoir reconstruction volume |
| CN109212161A (en) * | 2017-07-06 | 2019-01-15 | 中国石油化工股份有限公司 | A kind of method of determining shale gas reservoir adsorbed gas content |
-
2019
- 2019-09-03 CN CN201910826848.2A patent/CN112528455B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050194133A1 (en) * | 2003-02-28 | 2005-09-08 | Yates Petroleum Corporation | Methods of evaluating undersaturated coalbed methane reservoirs |
| CN104632187A (en) * | 2013-11-14 | 2015-05-20 | 中国石油化工股份有限公司 | Method for determining dynamic reserve volume of water production coal seam gas well |
| CN106481332A (en) * | 2015-08-31 | 2017-03-08 | 中国石油化工股份有限公司 | Method for determining area's dynamic holdup inside and outside shale gas multistage pressure break horizontal well |
| CN106484933A (en) * | 2015-08-31 | 2017-03-08 | 中国石油化工股份有限公司 | A kind of method and system for determining shale gas well well control dynamic holdup |
| CN107066674A (en) * | 2017-01-18 | 2017-08-18 | 西南石油大学 | The method for calculating shale gas reservoir volume fracturing horizontal well unstable state yield |
| CN109212161A (en) * | 2017-07-06 | 2019-01-15 | 中国石油化工股份有限公司 | A kind of method of determining shale gas reservoir adsorbed gas content |
| CN107806916A (en) * | 2017-09-11 | 2018-03-16 | 中国石油天然气股份有限公司 | Method and device for determining reservoir reconstruction volume |
Non-Patent Citations (3)
| Title |
|---|
| 张健等: "物质平衡法在煤层气藏生产动态预测中的应用", 《煤田地质与勘探》 * |
| 杨函等: "一种使用测井及排采数据核算含气量的方法及应用", 《华北国土资源》 * |
| 王博等: "煤层气井单井动态控制储量计算方法", 《石油化工应用》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113153274A (en) * | 2021-04-30 | 2021-07-23 | 中国矿业大学 | Deep coal seam in-situ gas content measuring method |
| CN113153274B (en) * | 2021-04-30 | 2022-09-09 | 中国矿业大学 | Deep coal seam in-situ gas content measuring method |
| CN113605879A (en) * | 2021-08-02 | 2021-11-05 | 中国石油大学(北京) | Method and device for calculating original formation pressure of coal reservoir |
| CN113464129A (en) * | 2021-08-03 | 2021-10-01 | 中国石油大学(北京) | Method and device for calculating average formation pressure of coal bed gas reservoir |
| CN114293974A (en) * | 2022-01-07 | 2022-04-08 | 中海石油(中国)有限公司 | Method and system for determining original gas content of coal bed gas development well |
| CN114293974B (en) * | 2022-01-07 | 2023-12-15 | 中海石油(中国)有限公司 | Method and system for determining original gas content of coal bed gas development well |
| CN117266804A (en) * | 2023-11-13 | 2023-12-22 | 东营中威石油技术服务有限公司 | Jet pump drainage control method and system |
| CN118333413A (en) * | 2024-01-31 | 2024-07-12 | 中国石油天然气股份有限公司 | Coalbed methane well productivity evaluation method and device, storage medium and electronic equipment |
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