Dynamic Distribution of Remaining Gas Content in Steep and Thick Coal Seams in Baiyanghe Mining Area of Fukang

doi:10.7657/XJPG20200512

Abstract

Abstract:

The coal seams in Baiyanghe mining area of Fukang in Junggar basin, Xinjiang, are thick and steep, and where the dynamic distribution of remaining coalbed methane (CBM) content is different from conventional horizontal coal seams. On the basis of numerical simulation, the models of fractured vertical wells, open-hole horizontal wells, and staged fractured horizontal wells were built in extremely steep and thick coal seams to find the dynamic distribution of remaining gas content in different well types. The results show that, at the beginning of production stage, the remaining gas content changes like a fan with the perforated hole as the fan axis; in the early-middle stage of production, affected by the gas-water differentiation, coalbed methane desorbed from deep coal seams migrates to shallow layers and causes the shallow reservoir pressure to increase, and it is adsorbed by the coal seams again and results in the increase of gas content in the shallow layers; in the middle of production stage, there is a balanced area between adsorption and desorption in shallow-middle coal seams; in the middle and late stages of production, after the gas desorbed from deep layers is produced, the coal seam pressure will reduce, and the methane in the middle and shallow layers begins to release; and finally in the late stage of production, there is a large amount of remaining gas in the deep seams.

Key words: Junggar basin, Baiyanghe mining area, steep dip, coal seam, coalbed methane, remaining gas content, dynamic distribution, numerical simulation

CLC Number:

TE122.2

WANG Hongli, ZHANG Suian, CHEN Dong, HUANG Hongxing, ZHAO Zengping. Dynamic Distribution of Remaining Gas Content in Steep and Thick Coal Seams in Baiyanghe Mining Area of Fukang[J]. Xinjiang Petroleum Geology, 2020, 41(5): 587-591.

Figures/Tables 6

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Table 1

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