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NB/T 11105-2023: Technical specification of coalbed methane numerical simulation
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Technical specification of coalbed methane numerical simulation
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NB/T 11105-2023
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Basic data | Standard ID | NB/T 11105-2023 (NB/T11105-2023) | | Description (Translated English) | Technical specification of coalbed methane numerical simulation | | Sector / Industry | Energy Industry Standard (Recommended) | | Classification of Chinese Standard | E11 | | Classification of International Standard | 75.020 | | Word Count Estimation | 14,168 | | Date of Issue | 2023-02-06 | | Date of Implementation | 2023-08-06 | | Issuing agency(ies) | National Energy Administration | NB/T 11105-2023: Technical specification of coalbed methane numerical simulation---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 75:020
CCSE11
People's Republic of China Energy Industry Standards
Coalbed Gas Numerical Simulation Technical Specifications
Released on 2023-02-06
2023-08-06 Implementation
Released by the National Energy Administration
table of contents
Preface I
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 General 1
5 Collection, collation and analysis of basic data 3
6 Model building 4
7 Initialization 6
8 Sensitivity Analysis 6
9 History Fitting 6
10 Dynamic Forecasting 7
11 Simulation research results 7
Appendix A (Informative) Coalbed Methane Numerical Simulation Model Types and Applicable Conditions 9
Appendix B (Informative) History Fitting Parameter Types and Adjustable Degree and Range 10
foreword
This document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules for Standardization Documents"
drafting:
Please note that some contents of this document may refer to patents: The issuing agency of this document assumes no responsibility for identifying patents:
This document was proposed by the China Coal Industry Association:
This document is under the jurisdiction of the National Coal Standardization Technical Committee (SAC/TC42):
This document was drafted by: CNOOC Research Institute Co:, Ltd:, China University of Petroleum (Beijing), China United Coalbed Methane Co:, Ltd:
The main drafters of this document: Du Xiyao, Liu Yinghong, Shi Juntai, Feng Ruyong, Wang Cunwu, Lu Yumin, Li Zhongcheng, Yang Kailei, Fang Maojun,
Liu Jia:
Coalbed Gas Numerical Simulation Technical Specifications
1 Scope
This document specifies the content, technical requirements and basic process of coalbed methane numerical simulation:
This document is applicable to the application research of coalbed methane numerical simulation, and other unconventional gas reservoirs can be used as a reference:
2 Normative references
The contents of the following documents constitute the essential provisions of this document through normative references in the text: Among them, dated references
For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to
this document:
GB/T 19559 Determination method of coalbed methane content
GB/T 19560 Coal High Pressure Isothermal Adsorption Test Method
GB/T 24504 Coalbed methane well injection/pressure drop test method
3 Terms and Definitions
The following terms and definitions apply to this document:
3:1
Based on the geological understanding and development rules of coalbed methane, special software (called numerical simulator) is used to simulate the desorption and expansion of coalbed methane in coal reservoirs:
According to the distribution, gas-water seepage and production, the obtained reservoir parameters and production data (or test production data) are fitted and matched, and then the gas-water production, gas-water production, and
Dynamic changes of pressure and coal reservoir parameters:
3:2
On the basis of acceptable historical fitting accuracy of coalbed methane well drainage data, under a certain development mode, the daily water production of coalbed methane wells can be predicted:
The process of developing dynamic indicators such as gas production, daily gas production, cumulative water production, cumulative gas production, coal reservoir pressure, remaining gas content, recovery degree, etc:
4 General
4:1 Basic process of CBM numerical simulation
The basic process of CBM numerical simulation is shown in Fig: 1, including the following process:
a) Collection, collation and analysis of basic data;
b) Model establishment: according to the main problems faced in different exploration and development stages, formulate reasonable research objectives, and establish single well and well group
or block model;
c) Initialization: check the balance of the established CBM model;
d) Sensitivity analysis: it is used to determine the sensitivity of different gas reservoir parameters to the objective function within a specific range of values, and it is used for subsequent historical simulation:
Provide a basis for the adjustment of joint parameters;
e) History matching: under the premise of production data, by fitting indicators such as gas production, water production, pressure, etc:, the model calculation and actual gas
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