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
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.
YANG Man-Ping, WANG Gang, XU Sheng-Yang, GAO Chao . Steady Flow Productivity Equation for Stress Sensitivity Coal bed Methane Gas Well#br# [J]. Natural Gas Geoscience, 2011 , 22(2) : 347 -351 . DOI: 10.11764/j.issn.1672-1926.2011.02.347
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