High Permeability Thin Sandstone Reservoirs With Bottom Water Characteristics Of The Early Water Coning Theory Research And Application

Based on the previous works and research fruits to the high-permeability , thin-layered bottom-water sand reservoir which is first exploited and developed in Luliang Oil-field Junggar basin Karamay Xingjian. Deeply analyst geological and dynamic traits, used reservoir simulator to investigate early water-coning trait of this special type bottom-water reservoir and built up a practical , theoretical analysis and forecast model.Compared practical water-coning cut with simulated results, we know that there are three stages of water-coning cut: rapidly increase stage, relatively steady stage and again increase stage. In this paper determined the previous two stages as early water-coning cut stage. Since the dynamic water-coning is controlled by many factors such as nature enology, injection dynamical , developing mechanical and so on. So this stage is not a pure water-coning and not a study focus in this paper. And the last time of rapidly increase stage is very short and can be determined by water-coning cut dynamical of relatively steady stage. So study the early water-coning cut relatively steady stage is very important-Coefficient ratio of geometry flowing resistance which related to water-coning is using, based on thin-layered bottom-water reservoir's characters and complex factors controlling water-cong. This paper used numerical simulator to investigate the quantitative relationship of reservoir permeability, oil-water viscosity ratio , thickness ratio , vertical permeability , perforating interval and so on, to the coefficient ratio of geometry flowing resistance of homogenous reservoir model, aeolotropism, anisotropic reservoir model. And built up quantitative relationship model of production rate, pressure differential , water-coning cut to reservoir's character at the stage of early relative steady water-coning. The results calculated by the forecast model is similar to the practical dynamical, so this forecast model can be used to determine perforatingintervah reasonable pressure differential of early developing stage to any thin-layered bottom-water reservoir..