欠饱和煤层气藏临界解吸压力计算方法

doi:10.13809/j.cnki.cn32-1825/te.2022.04.006

Abstract

Abstract:

In order to investigate the physical meaning of critical desorption pressure in undersaturated CBM（coalbed methane） reservoirs, the traditional critical desorption pressure calculation method and the liquid phase adsorption theory commonly used in field are introduced based on the status of the reserves of CBM, and the origin of the “undersaturated” phenomenon under the premise of gas phase wet is discussed. On the basis of the modified gas phase adsorption, the relationship between the critical desorption pressure and the capillary pressure in matrix pores is explained, and a new calculation method of critical desorption pressure is obtained. By comparing the advantages and disadvantages of the four methods in error analysis, theoretical completeness and operability, it is considered that the new calculation method proposed is relatively complete in theory, has strong operability and is easy to calculate, and obtains a reasonable result in an example. It can be concluded that CBM adsorption equilibrium and critical desorption phenomenon can be interpreted as the result of the interaction between reservoir pressure and capillary pressure under the premise of coalbed gas phase wetting. The improved gas phase adsorption theory and the new calculation method of critical desorption pressure are worth the further study.

Key words: CBM（coalbed methane）, critical desorption pressure, gas phase adsorption, capillary pressure, storage state

CLC Number:

TE349

ZHANG Si,PENG Xiaolong. Calculation method of critical desorption pressure in undersaturated CBM reservoirs[J].Petroleum Reservoir Evaluation and Development, 2022, 12(4): 589-595.

Figures/Tables 9

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References 22

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参数	传统气相吸附	液相吸附	井底流压反推	改进的气相吸附
误差	较多	一般	较多	一般
理论完备	一般	最好	一般	较好
可操作性	一般	一般	较差	最好

Calculation method of critical desorption pressure in undersaturated CBM reservoirs

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