Study On Distribution Law And Control Method Of Displacement Pressure Gradient In Medium-high Permeability Water Flooding Reservoir

As China's continental oil fields have entered a particularly high water cut period,the water injection development oilfield is facing an unprecedented severe situation.Theoretical research and mine practice show that water shutoff and profile control can effectively solve the heterogeneous contradictions in the longitudinal,plane and layer,expand the flooding and improve the development of water flooding.Accurate profile control is the most feasible development mode for oilfields to improve oil recovery under the current situation.(Accurate profile control is the use of a suitable plugging agent to reconstruct an effective displacement pressure gradient at a suitable location).Therefore,it is of great significance to carry out indepth research and application of water blocking and profile control technology in extra high water cut period.The core content is to understand and reconstruct the pressure gradient of target area displacement.To this end,this paper applies the method of combining modulus and mode to simulate the displacement distribution of oil-water well displacement,and clarifies the distribution characteristics of displacement pressure gradient under different conditions.The material model test content is divided into four parts:(1)the interlayer displacement pressure distribution test under unidirectional flow conditions;(2)the intralayer displacement displacement distribution test under the unidirectional flow condition;(3)the plane radial flow condition under the layer Displacement pressure distribution test;(4)Plane displacement pressure distribution test under plane radial flow conditions.The distribution characteristics of the displacement pressure gradient under different conditions are clarified.Then combined with the results of the physical model,the heterogeneous "three-band" numerical simulation model(including the heterogeneous combination of plane plane 6 and vertical 2)was established by COMSOL Multiphysics,and the displacement gradient and seepage resistance were established.Divide the standard and further establish a water drive belt division method combining field data such as instantaneous water content and ton oil consumption.Finally,the article discusses the blocking strategy under different combinations of different water drive belts(blocking dosage,location,type).)Conduct research and discussion.The research on the distribution law and regulation method of displacement pressure gradient provides reference for reservoir development status evaluation,well pattern distribution optimization,water shutoff and profile control decision,and lays a good foundation for research and application of water shutoff profile control technology in special high water cut period.The foundation has important practical significance for improving oil recovery.