Seepage Model and Pressure Response Characteristics of Non-Orthogonal Multi-Fracture Vertical Wells with Superimposed Sand Body in Tight Gas Reservoirs

Ziwu Zhou, Ao Xia, Rui Guo, Lin Chen, Fengshuo Kong and Xiaoliang Zhao ()
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Ziwu Zhou: Sulige Gas Field Branch of China Petroleum Corporation West Drilling Engineering Company, Ordos 017000, China
Ao Xia: Sulige Gas Field Branch of China Petroleum Corporation West Drilling Engineering Company, Ordos 017000, China
Rui Guo: Sulige Gas Field Branch of China Petroleum Corporation West Drilling Engineering Company, Ordos 017000, China
Lin Chen: Sulige Gas Field Branch of China Petroleum Corporation West Drilling Engineering Company, Ordos 017000, China
Fengshuo Kong: Sulige Gas Field Branch of China Petroleum Corporation West Drilling Engineering Company, Ordos 017000, China
Xiaoliang Zhao: State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China

Energies, 2023, vol. 16, issue 21, 1-17

Abstract: Faced with difficulties stemming from the complex interactions between tight gas sand bodies and fractures, when describing and identifying reservoirs, a composite reservoir model was established. By setting the supply boundary to characterize the superposition characteristics of sand bodies, a mathematical model of unstable seepage in fractured vertical wells in tight sandstone gas reservoirs was developed, considering factors such as stress sensitivity, fracture density and fracture symmetry. The seepage law and pressure response characteristics of gas wells in tight sandstone discontinuous reservoirs with stress sensitivity, semi-permeable supply boundary and complex fracture topology were determined, and the reliability of the model was verified. The research results more accurately display the pressure characteristic of a vertical well in the superimposed sand body with complex fractures and provide a more comprehensive model for tight gas production dynamic analysis and well test data analysis, which can more accurately guide the dynamic inversion of reservoir and fracture parameters.

Keywords: tight gas; superimposed sand body; complex fracture; seepage model; pressure response (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: 2023
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