阜康白杨河矿区大倾角厚煤层剩余含气量动态分布特征

doi:10.7657/XJPG20200512

摘要/Abstract

摘要：

新疆准噶尔盆地阜康白杨河矿区煤层厚度大、倾角大,其剩余含气量动态分布规律与常规水平煤层不同。利用数值模拟,构建了大倾角厚煤层压裂直井、裸眼水平井和分段压裂水平井模型,探寻不同井型排采过程中剩余含气量动态变化规律。研究结果表明：排采前期,煤层剩余含气量整体呈以射孔为轴的扇形变化特征;排采中前期,受到气、水重力分异影响,煤层气从深部解吸出来并向浅部运移,造成浅部储集层压力升高,煤层气二次吸附于煤层,浅部含气量升高;排采中期,煤层浅、中部形成吸附—解吸平衡区域;排采中后期,深部解吸气被采出后,储集层压力降低,中、浅部煤层开始新一轮解吸;排采后期,在深部煤层存在明显的高剩余含气量区。

关键词: 准噶尔盆地, 白杨河矿区, 大倾角, 煤层, 煤层气, 剩余含气量, 动态分布, 数值模拟

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

中图分类号:

TE122.2

王洪利, 张遂安, 陈东, 黄红星, 赵增平. 阜康白杨河矿区大倾角厚煤层剩余含气量动态分布特征[J]. 新疆石油地质, 2020, 41(5): 587-591.

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.

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