Influence of Bound and Mobile Water on Gas Well Production in a Low-Permeability Sandstone Gas Reservoir


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Abstract

The influence of mobile and bound water on seepage capability of a low-permeability sandstone gas reservoir was studied and formulas were derived to calculate gas well production rate using cores from Xujiahe low-permeability sandstone gas reservoir in China. It is shown that mobile water in the well exerts a stronger negative effect on gas production than bound water. If the pressure gradient is too steep, a small part of the bound water may turn into mobile water, whereupon the gas seepage efficiency falls. So, use of controlled pressure is recommended for gas production, which in the end enhances the gas recovery efficiency of the reservoir.

About the authors

Li Qi

Institute of Porous Flow & Fluid Mechanics, Chinese Academy of Sciences (CAS); Langfang Branch, Research Institute of Petroleum Exploration & Development, PetroChina

Author for correspondence.
Email: liqi0620@163.com
China, Langfang, Hebei; Langfang, Hebei

Ye Liyou

Institute of Porous Flow & Fluid Mechanics, Chinese Academy of Sciences (CAS); Langfang Branch, Research Institute of Petroleum Exploration & Development, PetroChina

Email: liqi0620@163.com
China, Langfang, Hebei; Langfang, Hebei

Gai Zhaohe

Daqing Drilling Engineering Technology & Research Institute, PetroChina

Email: liqi0620@163.com
China, Daqing, Heilongjiang

Li Yong

Research Institute of Petroleum Exploration & Development in Huabei, PetroChina

Email: liqi0620@163.com
China, Langfang, Hebei

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