Sweep Efficiency And Development Strategies Of Heavy Oil Reservoir With Strong Bottom Water

Heavy oil reservoir driven by strong bottom water shows early water breakthrough,short period of anhydrous production and fast water cut rise.In addition,the higher viscosity of oil,the greater difference of oil-water flow rate,and the phenomenon of viscous fingering aggravate the coning and ridging of bottom water.Flow pattern of horizontal well production is three-dimensional and three-dimensional,so the study of volume sweep law of horizontal well can reflect its seepage characteristics more objectively.Firstly,based on the actual production data of heavy oil reservoir in Y oilfield,this paper divides the dynamic model,extracts the main controlling factors,recognizes the development law of this kind of oilfield,and clarifies the sweep law under different displacement modes.Then,three-dimensional sweep physical simulation experiments of horizontal wells are designed and carried out,and the effects of viscosity and interlayer range on the shape and sweep coefficient of water ridge sweep are comprehensively analyzed.At the same time,numerical simulation of sweep law of heavy oil reservoirs with strong bottom water is carried out to characterize the sweep law of horizontal wells along wellbore direction,vertical wellbore direction and volume.Finally,the main controlling factors of remaining oil are analyzed,the remaining oil distribution pattern is summarized,and the scheme of well pattern infilling adjustment is given.Suggestions and measures for controlling horizontal wells,such as mechanical water blocking,foam water pressing cone and sectional completion,are put forward.The prediction results are good,and the sweep efficiency can be effectively improved.The sweep law of horizontal wells in heavy oil reservoirs with strong bottom water is an important direction to improve oil recovery.