Evaluation of Lateral Displacement Ability to Waterflood in The Offshore Extensive Bottom Water Reservoir

Abstract As a typical offshore active bottom water driven reservoir, CFD oil fields have crude oil surface densities ranging from 0.940 to 0.982 t/m 3 , and exhibit significant high viscosity characteristics. Engineering practice has shown that this type of reservoir generally experiences a sharp increase in water content during the development process. After encountering water, the water content of the reservoir rapidly rises and enters the high water content development stage in a short period of time. It is worth noting that after entering the late stage of ultra-high water content development, existing development measures face significant technical bottlenecks due to limitations in the processing capacity of offshore platforms and underground operating conditions. In this context, it is urgent to conduct feasibility studies on artificial water injection development, in order to achieve the goal of stable production and increased efficiency of oil fields through innovative development mechanisms.. It has a specific lateral displacement effect on the remaining oil in the control area of the water injection well that is not swept in the original natural energy production stage, but there is no quantitative judgment method for the strength of the specific displacement effect. To quantitatively describe the strength of lateral displacement. This study uses the relevant theories of reservoir engineering and seepage mechanics, introduces the concept of waterline propulsion speed, quantitatively characterizes the displacement energy in different directions, and evaluates the injection effect at the stage of water injection development by comparing the displacement energy in different directions. Based on the theory of reservoir engineering and percolation mechanics, the concept of waterline advancing velocity is introduced to quantitatively characterize the displacement energy in different directions. By comparing the displacement energy in different directions, the injection effect in water injection development stage is evaluated. This study puts forward corresponding suggestions for adapting water injection development in offshore strong bottom water oilfields.