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GB/T 24504-2025 English PDF

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US$359.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 24504-2025: Method of injection/falloff well test for coalbed methane well
Status: Valid

GB/T 24504: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 24504-2025	359	Add to Cart	4 days	Method of injection/falloff well test for coalbed methane well	Valid
GB/T 24504-2009	259	Add to Cart	3 days	The method of injection/falloff well test for coalbed methane well	Valid

Similar standards

GB/T 51033 GB/T 50082 GB/T 24504

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: 18,190
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Older Standard (superseded by this standard): GB/T 24504-2009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

---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT24504-2025
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

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. ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 24504-2025_English be delivered?

Answer: Upon your order, we will start to translate GB/T 24504-2025_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 24504-2025_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 24504-2025_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.

Question 5: Should I purchase the latest version GB/T 24504-2025?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 24504-2025 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.