收稿日期: 2009-11-27
修回日期: 2010-03-10
网络出版日期: 2011-04-10
基金资助
国家重点基础研究发展规划(“973”)项目“高丰度煤层气富集机制及提高开采效率基础研究”(编号：2009CB219604)资助.
Steady Flow Productivity Equation for Stress Sensitivity Coal bed Methane Gas Well#br#
Received date: 2009-11-27
Revised date: 2010-03-10
Online published: 2011-04-10
杨满平, 王刚, 许胜洋, 高超 . 考虑应力敏感性的煤层气稳定流动气井产能方程[J]. 天然气地球科学, 2011 , 22(2) : 347 -351 . DOI: 10.11764/j.issn.1672-1926.2011.02.347
A large number of experiments show that stress sensitivity exists in the coal reservoirs and has a significant effect on the gas production of coal-bed methane wells. Based on former experimental results, we set up the mathematical relationship between coal-bed permeability and effective pressure or formation pressure, both of them well fit the exponential correlation. We also build the gas well productivity equation for coal reservoir stress sensitivity under Darcy and non-Darcy steady flow conditions. The result shows that the productivity of coal-bed methane wells are greatly affected by the stress sensitivity. With drawdown pressure increases, gas production increases little, and gradually goes towards stability. So a reasonable drawdown pressure for gas production will be required.
Key words： Coal-bed methane; Stress sensitivity; Productivity; Steady flow; Darcy flow; Non-Darcy flow.
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