Study on Numerical Simulation of Reservoir Fine Water Injection Development Considering Reservoir Heterogeneity

Bingyong Zhang

doi:10.54097/zhafm436

Authors

Bingyong Zhang

DOI:

https://doi.org/10.54097/zhafm436

Keywords:

Reservoir Heterogeneity, Numerical Simulation, Reservoir Fine Water Injection, Recovery Ratio

Abstract

Reservoir heterogeneity includes macroscopic interlayer, intralayer and plane heterogeneity, as well as microscopic differences in pore structure and wettability, which significantly affect water flooding efficiency and remaining oil distribution. By collecting geological, dynamic and rock fluid data, a fine geological model is constructed, and the reservoir characteristics are accurately described by using mixed grid strategy and discrete fracture network model. In the numerical simulation, the black oil model considering the influence of dissolved gas is selected and the non-Darcy flow is modified. In the design of development scheme, the water injection mode, water injection horizon selection, dynamic control of water injection speed and injection-production ratio optimization strategy are optimized. The results show that the oil recovery is increased by 6.2% by stratified controlled water injection compared with uniform water injection, and the oil recovery is further increased by 2.5% by dynamic optimization scheme. Reservoir heterogeneity has a significant impact on the development effect. For every 0.1 increase in permeability variation coefficient, the sweep efficiency of water flooding decreases by about 8%. Through dynamic injection-production regulation and intelligent separate injection technology, the optimization scheme has significantly improved the oil recovery and economic benefits.

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