关键词: Halahatang oilfield, fractured-vuggy reservoir, dumpflood, coupling model, flow simulation, numerical simulation

Abstract: Water injection is needed in the middle and late development stages of the fractured-vuggy reservoirs in the Halahatang oilfield. The research on self-flow water injection in China is still in its preliminary stage, lacking a complete dumpflood flow model and a development effect optimization software. Starting from the key nodes such as partial perforated water layer, perforation hole, water valve and fracture-vug complex and so on, a flow model is established for fractured-vuggy water layer-fracture-vug complex unit. The software COMSOL is used to simulate the flow of these key nodes, the flow equations of each node are coupled to establish a system-wide flow coupling model, and the numerical simulation and verification are carried out by using Eclipse. The comparative verification results show that the dump-flood numerical simulation model proposed in this paper can be used to predict the self-flow water injection volume and formation pressure variation trend of fractured-vuggy reservoirs, which could provide references for dumpflood design optimization.

Key words: Halahatang oilfield, fractured-vuggy reservoir, dumpflood, coupling model, flow simulation, numerical simulation