Physical simulation of hydrodynamic conditions in high rank coalbed methane reservoir formation

煤层气 石油工程 秩(图论) 储层模拟 甲烷 环境科学 地质学 工程类 化学 数学 煤矿开采 废物管理 组合数学 有机化学
作者
Bo Wang,Bo Jiang,Lei Liu,Guiqiang Zheng,Yong Qin,Hongyan Wang,Honglin Liu,Guizhong Li
出处
期刊:Mining Science and Technology (china) [Elsevier]
卷期号:19 (4): 435-440 被引量:10
标识
DOI:10.1016/s1674-5264(09)60081-8
摘要

In order to select highly productive and enriched areas of high rank coalbed methane reservoirs, based on hydrologic geology as one of the main factors controlling coalbed methane (CBM) reservoir formations, the effect of hydrodynamic forces controlling CBM reservoir formations was studied by a physical simulation experiment in which we used CBM reservoir simulation facilities. The hydrodynamic conditions of high coal rank reservoirs in the Qinshui basin were analyzed. Our experiment shows the following results: under strong hydrodynamic alternating action, δC1 of coalbed methane reservoir changed from the start at −2.95% ∼ −3.66%, and the lightening process occurred in phases; the CH4 volume reduced from 96.35% to 12.42%; the CO2 volume decreased from 0.75% in sample 1 to 0.68% in sample 2, then rose to 1.13% in sample 3; the N2 volume changed from 2.9% in sample 1 to 86.45% in sample 3. On one hand, these changes show the complexity of CBM reservoir formation; on the other hand, they indicate that strong hydrodynamic actions have an unfavorable impact on CBM reservoir formation. It was found that the gas volume and hydrodynamic intensity were negatively correlated and low hydrodynamic flow conditions might result in highly productive and enriched areas of high rank CBM.
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