Transient Pressure Performance Analysis of Hydraulically Fractured Horizontal Well in Tight Oil Reservoir

Lichun Sun, Maojun Fang (), Weipeng Fan, Hao Li and Longlong Li ()
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Lichun Sun: CNOOC Research Institute Ltd., Beijing 100028, China
Maojun Fang: CNOOC Research Institute Ltd., Beijing 100028, China
Weipeng Fan: CNOOC Research Institute Ltd., Beijing 100028, China
Hao Li: CNOOC Research Institute Ltd., Beijing 100028, China
Longlong Li: Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China

Energies, 2024, vol. 17, issue 11, 1-15

Abstract: Utilizing the discrete fracture model (DFM), a transient flow model is established for fractured horizontal wells in tight oil reservoirs, accounting for threshold pressure gradient (TPG), stress sensitivity effect, hydraulic fracture parameters, and fracture distribution pattern. This model is solved using the finite-volume method (FVM), and an important sensitivity analysis is conducted. The findings reveal that the models incorporated by the threshold pressure gradient result in an upward trend in the pressure-derivative curve. As the threshold pressure gradient increases, this upward trend becomes more pronounced, rendering the distinction between flow regimes more challenging. The stress sensitivity effect predominantly impacts the pressure-derivative curve during the later flow period. Additionally, as the fracture half-length increases, the pressure performance of both fracture radial flow and formation radial flow becomes more difficult. Fracture conductivity has a significant influence during the early flow period, facilitating the identification of flow regimes with the trend of increasing fracture conductivity.

Keywords: tight oil reservoir; transient flow; threshold pressure gradient; stress sensitivity effect; discrete fracture model (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: 2024
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