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GB/T 24504-2025: Method of injection/falloff well test for coalbed methane well
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GB/T 24504: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 24504-2025 | English | 359 |
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Method of injection/falloff well test for coalbed methane well
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GB/T 24504-2025
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| GB/T 24504-2009 | English | 259 |
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The method of injection/falloff well test for coalbed methane well
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PDF similar to GB/T 24504-2025
Basic data
| Standard ID | GB/T 24504-2025 (GB/T24504-2025) |
| Description (Translated English) | Method of injection/falloff well test for coalbed methane well |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | D20 |
| Classification of International Standard | 73.040 |
| Word Count Estimation | 18,133 |
| Date of Issue | 2025-08-01 |
| Date of Implementation | 2026-02-01 |
| Older Standard (superseded by this standard) | GB/T 24504-2009 |
| Issuing agency(ies) | State Administration for Market Regulation, Standardization Administration of China |
GB/T 24504-2025: Method of injection/falloff well test for coalbed methane well
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ICS 73.040
CCSD20
National Standard of the People's Republic of China
Replaces GB/T 24504-2009
Coalbed Methane Well Injection/Drawdown Test Method
Released on August 1, 2025
Implementation on February 1, 2026
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Method Summary 1
5 Instruments and Equipment 2
5.1 Pressure gauge 2
5.2 Shut-in tools 2
5.3 Packer 2
5.4 Tool string combination 2
5.5 Wellhead Equipment 2
5.6 Blowout preventer 2
5.7 Pumping system 2
6 Well Test Design 3
6.1 Basic design data 3
6.2 Well Test Type 3
6.3 Parameter calculation 4
7 Construction Procedure 5
7.1 Test Preparation 5
7.2 Construction Step 5
8 Data Recording and Collection 6
8.1 On-site operation records 6
8.2 Pressure gauge data acquisition 7
9 Well test data interpretation 7
9.1 Basic drawing 7
9.2 Selection of Basic Parameters for Well Test Interpretation 7
9.3 Injection/pressure drop test data analysis 8
9.4 Analysis of in-situ stress test data 8
10 Well Test Report 8
Appendix A (Normative) Downhole Test String Data Record Sheet 9
Appendix B (Normative) Injection/Pressure Drop Test Raw Data Record Table 10
Appendix C (Normative) In-situ stress test raw data record table 11
Preface
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.
This document replaces GB/T 24504-2009 "Coalbed Methane Well Injection/Drawdown Test Method". Compared with GB/T 24504-2009,
In addition to structural adjustments and editorial changes, the main technical changes are as follows.
a) Added terms and definitions (see Chapter 3);
b) added a summary of methods (see Chapter 4);
c) The requirements for instruments and equipment have been changed (see 5.3, 5.4, and 3.3, 3.4 of the.2009 edition);
d) The requirements for preparation of basic design data have been changed (see 6.1.1, 5.1 of the.2009 edition);
e) Added well test types (see 6.2);
f) The preparation requirements for test wells have been modified (see 7.1.1, 5.2.1 of the.2009 edition);
g) Added the placement position of the sieve tube in the test (see 7.1.3);
h) Added the requirement for replacement of drilling fluid (see 7.2.4).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the 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. China Coal Technology and Engineering Xi'an Research Institute (Group) Co., Ltd., Xi'an Coal Science and Technology Testing Technology Co., Ltd., CNOOC Energy
Development Co., Ltd.
The main drafters of this document are. Yang Xinhui, Wang Yi, Chen Zhisheng, Li Binggang, Li Xin, Yuan Zhijie, Lin Peiyao, and Ma Litao.
This document was first published in.2009 and this is the first revision.
Coalbed Methane Well Injection/Drawdown Test Method
1 Scope
This document specifies the method summary, instrumentation, well test design, construction procedures, data recording and sampling of coalbed methane well injection/pressure drawdown test.
Well test data collection, interpretation and well test report and other technical contents.
This document applies to well testing conducted during the drilling process or after completion of coalbed methane wells.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 17745 Maintenance and use of casing and tubing in the petroleum and natural gas industry
GB/T 31537 Coalbed Methane (Coal Mine Gas) Terminology
DZ/T 0250 Coalbed Methane Drilling Operation Specification
3 Terms and Definitions
The terms and definitions defined in GB/T 31537 and the following apply to this document.
3.1
Shut down
Close the test valve or device to make the formation pressure system an independent system.
3.2
Shut-in time
The duration of time required to close the test valve or device to allow formation pressure to recover.
3.3
shut-in device
A valve or device used to shut down a well underground or at the wellhead.
3.4
Openwell
Open the test valve or device to connect the formation pressure system with the test pressure system.
4 Method Summary
Working principle of injection/pressure drop test. follow the basic principle of unstable well test, use oil pipe or drill pipe to send the test equipment into the well to make the test more stable.
Water is injected into the well at a fixed displacement and an injection pressure lower than the coal seam fracture pressure, creating a pressure distribution around the wellbore that is higher than the original reservoir pressure.
The well is then shut in, the pressure drops, and the bottom hole pressure gradually approaches equilibrium with the original reservoir pressure. The data of the bottom hole pressure changing with time are recorded throughout the process.
Through comprehensive analysis, the coal reservoir permeability (K), reservoir pressure (Pi), skin coefficient (S), detection radius (Ri), reservoir temperature (R) and other parameters are obtained.
(T) etc.