Inversion of Fracture Parameters and Formation Pressure for Fractured Horizontal Wells in Shale Oil Reservoir Based on Soaking Pressure

doi:10.7657/XJPG20220517

Abstract

Abstract:

A fractured horizontal well in shale oil reservoir should be soaked before it is put into production. In order to quickly evaluate the effect of volume fracturing, a post-frac evaluation method based on the data of soaking pressure of shale oil reservoirs was proposed. Through numerical simulation of well soaking, the pressure diffusion and fluid migration in the stimulation area controlled by the fractured horizontal well were characterized, and a post-closure linear flow calculation model and a fracture storage control calculation model were established. Then a calculation method for inverting fracture parameters and formation pressure was formed. The results show that after pump is stopped, the stimulation area goes through 9 flow stages such as flows controlled by fractures in end section of wellbore, by fractures in the whole wellbore and by reservoir matrix, and the pressure drop derivatives appear as multiple straight-line segments with different slopes in log-log coordinates. This method has been applied to four typical shale oil horizontal wells in Jimsar sag, which proves that the data of soaking pressure can be used for the inversion of fracture parameters and formation pressure, and also verifies the applicability of the proposed method. The study results provide a reference for evaluating fracturing effect and optimizing well spacing.

Key words: Jimsar sag, shale oil, horizontal well, volume fracturing, well soaking, pressure drop, formation pressure, numerical simulation

CLC Number:

TE357

WANG Fei, WU Baocheng, LIAO Kai, SHI Shanzhi, ZHANG Shicheng, LI Jianmin, SUO Jielin. Inversion of Fracture Parameters and Formation Pressure for Fractured Horizontal Wells in Shale Oil Reservoir Based on Soaking Pressure[J]. Xinjiang Petroleum Geology, 2022, 43(5): 624-629.

Figures/Tables 5

References 23

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