Bottom Water Energy Control to Enhance Oil Recovery in Bottom-Water Reservoir: Calculation Method for Artificial-Interlayer Shape of Bottom-Water Reservoir

How to control bottom water energy reasonably and effectively of bottom-water reservoir is puzzling Field Engineer until now. The key technique of development for bottom-water reservoirs is to depress or control water cone, prolong water free production period as much as possible. In order to settle the question, this paper, based on static mechanism and kinetic equation of underground fluid, the model for calculating the height of the artificial-interlayer with curvilinear side surface is established. The model quantitatively describes the relationship between the artificial-interlayer height and oil yield, reservoir thickness, radial distance from well axis, reservoir permeability and crude oil viscosity etc. The maximum artificial-interlayer height and radius, the artificial-interlayer heights at different radial distances can be obtained according to this model. Build calculate method of the artificial-interlayer height model, the analytic solution of the model can be gained if interlayer liquid is plane radial flow and the non-Darcy flow is not considered; Through a field case, the characteristics of artificial-interlayer form are analyzed, and rules of artificial-interlayer conformation are obtained when artificial-interlayer liquid with different volume, viscosity and velocity injected, which provides a reference for the development of bottom-water reservoir.