上海交通大学学报(英文版) ›› 2017, Vol. 22 ›› Issue (6): 726-732.doi: 10.1007/s12204-017-1893-6

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Experimental Simulation on Dynamic Variation of the Permeability of High-Rank Coal Reservoirs

HE Ye1,2* (何也), FU Xuehai1 (傅雪海), LIU Aihua3 (刘爱华)   

  1. (1. School of Resources & Earth Science, China University of Mining & Technology, Xuzhou 221008, Jiangsu, China; 2. Xuzhou Mining Business Group Co., Ltd., Xuzhou 221006, Jiangsu, China; 3. Shallow Geothermal Energy Department, Beijing Geothermal Research Institute, Beijing 102218, China)
  • 出版日期:2017-12-01 发布日期:2017-12-03
  • 通讯作者: HE Ye (何也) E-mail:dapenghy@163.com

Experimental Simulation on Dynamic Variation of the Permeability of High-Rank Coal Reservoirs

HE Ye1,2* (何也), FU Xuehai1 (傅雪海), LIU Aihua3 (刘爱华)   

  1. (1. School of Resources & Earth Science, China University of Mining & Technology, Xuzhou 221008, Jiangsu, China; 2. Xuzhou Mining Business Group Co., Ltd., Xuzhou 221006, Jiangsu, China; 3. Shallow Geothermal Energy Department, Beijing Geothermal Research Institute, Beijing 102218, China)
  • Online:2017-12-01 Published:2017-12-03
  • Contact: HE Ye (何也) E-mail:dapenghy@163.com

摘要: In terms of the coal reservoir permeability of effective stress, coal matrix shrinkage and gas slippage, we conduct the tests of gas permeability under constant confining pressure and effective stress, as well as illustrate the cumulating method of permeability increment caused by the effects of gas slippage and coal matrix shrinkage. The results show that under the constant confining pressure, gas slippage affecting coal permeability changes to effective stress affecting it mainly. The change point increases with the increase of the confining pressure. The gas slippage effect leads to high permeability under low confining pressure, but coal matrix expansion results in the low value as confining and gas pressures increase. Combined with the drainage process of coalbed methane (CBM) well, the permeability is divided into four change stages based on the above analysis about the three effects, which can improve the change regulation understanding. Four stages are the downward phase under effective stress, the conversion phase of effective stress-coal matrix contraction effect (mainly based on effective stress), the rising stage of the effective stress-coal matrix contraction effect (mainly based on coal matrix contraction effect) and the rising phase of coal matrix contraction-slippage effect (mainly based on slippage effect). Permeability of coal reservoir during the process of drainage and production goes through four stages.

关键词: coalbed methane (CBM), permeability, high-rank coal reservoir, dynamic variation, effective stress, coal matrix shrinkage, gas slippage

Abstract: In terms of the coal reservoir permeability of effective stress, coal matrix shrinkage and gas slippage, we conduct the tests of gas permeability under constant confining pressure and effective stress, as well as illustrate the cumulating method of permeability increment caused by the effects of gas slippage and coal matrix shrinkage. The results show that under the constant confining pressure, gas slippage affecting coal permeability changes to effective stress affecting it mainly. The change point increases with the increase of the confining pressure. The gas slippage effect leads to high permeability under low confining pressure, but coal matrix expansion results in the low value as confining and gas pressures increase. Combined with the drainage process of coalbed methane (CBM) well, the permeability is divided into four change stages based on the above analysis about the three effects, which can improve the change regulation understanding. Four stages are the downward phase under effective stress, the conversion phase of effective stress-coal matrix contraction effect (mainly based on effective stress), the rising stage of the effective stress-coal matrix contraction effect (mainly based on coal matrix contraction effect) and the rising phase of coal matrix contraction-slippage effect (mainly based on slippage effect). Permeability of coal reservoir during the process of drainage and production goes through four stages.

Key words: coalbed methane (CBM), permeability, high-rank coal reservoir, dynamic variation, effective stress, coal matrix shrinkage, gas slippage

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