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Evaluation of non-Darcy flow effect in gas well considering influence of flow boundary
KANG Xiao-dong, LI Xiang-fang, CHENG Shi-qing
(Faculty of Petroleum Engineering in China University of Petroleum,Beijing 102249, China)
Abstract:
According to the flow law of gas through reservoir with non-Darcy flow around wellbore and Darcy flow far from wellbore of gas well with high production, the deliverability equation was found in consideration of the influence of flow boundary and derived from the Forchheimer formula for non-Darcy flow. The calculation method of non-Darcy flow coefficient and the skin factor was given, and the evaluation method of non-Darcy flow effect based on the steady state well testing was improved. The effects of flow boundary on non-Darcy flow coefficient were analyzed. The result shows that the non-Darcy flow effect is overrated because higher non-Darcy flow coefficient without considering the influence of flow boundary is given when the radius of non-Darcy flow and the radius of wellbore are comparable. The flow boundary of non-Darcy flow has obvious influence on the evaluation of non-Darcy flow effect.
Key words:  gas well  flow boundary  non-Darcy flow effect  productivity  steady state well testing