![]() The fracture system remains a “high-pressure area” for a long time during shut-in. Contrarily, the pressure of the lipophilic reservoir diffuses slowly and only propagates in the secondary fracture or the matrix near the fractures. After 65 days of well shut-in, the whole reservoir tends to be at the same pressure and reaches the equilibrium of imbibition replacement. ![]() According to the numerical simulation results, the pressure diffuses rapidly among the matrix during the shut-in time in the hydrophilic reservoir. Eventually, the evaluation of optimal shut-in time is taken by imbibition replacement balance. Furthermore, the sensitivity analysis is carried out from two aspects of geological and fracture factors. Primarily, the distribution of pressure and saturation during fracturing time and shut-in time is accurately described by the numerical simulation method. Aiming at the Jimsar area, there are several steps in this study in order to explore the new law of fracturing fluid imbibition and oil recovery in shale reservoirs. Therefore, it is of great significance to study the law of imbibition and replacement during the shut-in time. Whether the fracturing fluid has the potential of shale matrix imbibition oil recovery after a large amount of slickwater injected into the reservoir is a research hotspot at present. The volume fracturing technology along with horizontal well is the main technology to obtain commercial oil flow in shale reservoirs because of the low porosity and low permeability. ![]() 3Institute of Petroleum, China University of Petroleum-Beijing, Karamay, China.2Education Ministry Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing, China. ![]()
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