Study of the Effect of Movable Water Saturation on Gas Production in Tight Sandstone Gas Reservoirs

Jie Zhang, Xizhe Li, Weijun Shen, Shusheng Gao, Huaxun Liu, Liyou Ye and Feifei Fang
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Jie Zhang: School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100190, China
Xizhe Li: Department of Porous Flow & Fluid Mechanics, PetroChina Research Institute of Petroleum Exploration & Development, Langfang 065007, China
Weijun Shen: School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100190, China
Shusheng Gao: Department of Porous Flow & Fluid Mechanics, PetroChina Research Institute of Petroleum Exploration & Development, Langfang 065007, China
Huaxun Liu: Department of Porous Flow & Fluid Mechanics, PetroChina Research Institute of Petroleum Exploration & Development, Langfang 065007, China
Liyou Ye: Department of Porous Flow & Fluid Mechanics, PetroChina Research Institute of Petroleum Exploration & Development, Langfang 065007, China
Feifei Fang: School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing 401331, China

Energies, 2020, vol. 13, issue 18, 1-14

Abstract: The movable water saturation of tight sandstone reservoirs is an important parameter in characterizing water production capacity, and there is a great need to understand the relationship between movable water saturation and water production characteristics. However, movable water behavior in this context remains unclear. In this study, four groups of tight sandstone cores from the Sulige gas field are measured to understand the movable water saturation characteristics. Then, the effects such as reservoir micropore throat, clay mineral and physical properties on movable water saturation are analyzed, and the movable water saturation and water production characteristics are discussed. The results show that higher movable water saturation will result in a greater amount of water in the gas drive. There is a critical pressure difference of the gas drive, and a large amount of movable water will flow out. Movable water saturation is independent of the porosity, permeability and initial water saturation, while it is closely related to the reservoir micropore throat and clay mineral content. Movable water is mainly distributed in the medium and large pores; the larger the proportion of such pores, the higher the degree of movable water saturation. A lower mineral content will lead to higher movable water saturation in tight sandstone gas reservoirs. These results provide clues for identifying gas–water bearing reservoirs and evaluating and predicting the water production characteristics in gas wells in tight sandstone gas reservoirs.

Keywords: tight sandstone gas reservoir; movable water saturation; gas drive water; NMR; water production (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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