GB/T 19559-2021Method of determining coalbed methane content (English PDF)

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 of Standardization Documents" Drafting.

This document replaces GB/T 19559-2008 "Method for the Determination of Coal Bed Methane Content". Compared with GB/T 19559-2008, except for editorial changes In addition, the main technical changes are as follows.

a) The normative references have been changed (see Chapter 2, Chapter 2 of the.2008 edition);

b) Added understanding of the schematic diagram of the suction tank (see 4.1);

c) The requirements for closing the desorption tank in the natural desorption determination step are changed (see 6.1.1, 5.1.1 in the.2008 edition);

d) The hose connection method in the gas sample collection step is changed (see 6.3.1, 5.3.1 of the.2008 edition);

e) The minimum number of points required for the estimation of lost gas volume has been added (see 7.2.2);

f) The requirement for deducting air in the calculation of gas composition has been added (see 7.4);

g) The requirements for calculation of adsorption time have been changed (see 7.6, 6.6 of the.2008 edition);

h) Part of the content in the quality review has been added (see 9.3.2).

1 Scope

This document specifies the method for determining the CBM content of coal core samples.

This document is applicable to the determination of coalbed methane content in bituminous coal and anthracite coal core samples obtained in the exploration and development of coal and coalbed methane, lignite coal cores The determination of the sample's coalbed methane content is carried out by reference.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 13610 Composition Analysis of Natural Gas Gas Chromatography

3 Terms and definitions

There are no terms and definitions that need to be defined in this document.

4 Equipment

4.1 Desorption tank. As shown in Figure 1, the desorption tank is cylindrical, with a height of more than 30 cm, a volume of more than 1000 cm3, and a pressure of 0.3 MPa. Tightness. Indexing serial number description. 1---tank body; 2---can lid; 3---Air valve; 4---Pressure gauge.

Figure 1 Schematic diagram of desorption tank