Geomechanical response of a compositional reservoir under constant bottom-hole pressure condition for producing well: a case study of Brazilian reservoir fluids

When a compositional simulation of a petroleum reservoir is coupled with a geomechanical assessment, the simulation results are noticeably more realistic. The primary objective of this paper is to assess different production scenarios that consider the porous media's geomechanical response. To do this, the constant bottom-hole pressure is applied for the producing well, and to make the model more realistic, the reservoir was constructed using eight pseudo-component fluids from an actual reservoir located in the southern region of Brazil. The reservoir has been confined laterally but set to be free to move vertically using a ۳D finite elements simulator, with porosity considered a function of pressure, temperature, and total mean stress.Results demonstrated that when geomechanical variables are added, the profile of producing fluids, such as water, oil, and gas rates, and average reservoir pressure are significantly different. This causes considerable forecast inaccuracy, and water breakthrough prediction can vary significantly. Also, each scenario includes a reference for the change in porosity of a gridlock in which the well is completed. The CPU runtime for each scenario is also presented, with the runtime increasing by ۱۱ and ۱۲ times for water and gas injection scenarios when geomechanical factors are considered. In addition, it was discussed how researchers could apply these results to future research, including lumping and integration with surface facilities. The results of this study demonstrate that integrating geomechanical modeling impacts productivity, and future studies on actual reservoirs should consider the geomechanical response for accurate simulation of hydrocarbon reservoirs.

کلیدواژه ها:

Geomechanics ، Finite Elements ، Compositional Simulation