Research On The Policy Boundary Of Water Control Technology For Horizontal Well Development In YSM Oilfield

Active edge water is a double-edged sword in oilfield development,especially for heavy oil reservoirs.On the one hand,the side-bottom water can provide sufficient water drive energy;on the other hand,the presence of the edge-bottom water is likely to form the bottom water coning in the longitudinal direction and the finger-in phenomenon on the plane,causing the production well to be flooded prematurely,lowering reservoir recovery,where the bottom water coning has a greater impact on development in heavy reservoir.The effects of edge water,bottom water,and secondary bottom water all exist in the YSM heavy oil field,so the presence of the bottom water must be considered during the development and adjustment of the oil field.Bottom water coning is one of the difficulties in the development of bottom water reservoirs.Although some achievements have been made in theoretical research and practical application at home and abroad,due to the complex seepage mechanism of bottom water reservoirs,The research on the application of reservoir water cone dynamics and reasonable mining strategies is both necessary and challenging.This article takes the YSM oilfield as an example,mainly carried out the following research work and achieved corresponding results:(1)Comprehensive knowledge of various dynamic and static geologic reservoirs in the oilfield,and further understanding of the geological characteristics and development features of the YSM oilfield reservoir,summarizing the problems faced in the current development process.(2)Established the actual geological model of YSM oilfield,completed the history of numerical simulation,and studied the distribution characteristics of the remaining oil in the oilfield.The study found that the remaining oil potential of YSM oilfield is concentrated in Y3 fault block and Y1 fault block,in which the remaining oil of Y3 fault block is mainly in Ngl and Ng2 upper oil groups;the remaining oil in Y1 fault block is mainly in Nmx and Ngl oil groups.The total recovery of the two oil groups is relatively low,and both the oil saturation and the abundance of recoverable reserves are relatively high.(3)For the existence of edge water in YSM oilfield,there is a problem of water cones.A bottom water cone mechanism model was established to study the different oil production rates,different crude oil viscosity,different well types,and different perforation levels for bottom water coning.influence level.The study found that:1)Development of bottom-water reservoirs with vertical wells,crude oil viscosity,perforation degree,and oil production rate are the main factors for the formation of bottom water coning.2)Development of bottom-water reservoirs with horizontal wells,the viscosity of crude oil is the main factor for the formation of bottom ridges,and the relative position of horizontal wells also has a certain influence.The closer the location is to the top of the reservoir,the larger the ridges will be,and the more beneficial to development is,The same rate of oil production in a vertical well is a major influence on the development and production time and the time of seeing water.3)The effect of the viscosity of crude oil on the bottom cone(ridge)flow is greater in the vertical well than in the horizontal well.As the viscosity of crude oil increases,the recovery of vertical wells decreases faster.(4)Based on the numerical simulation of the remaining oil distribution of the reservoir and the study of the bottom water coning mechanism,Completed potential tapping of thin oil reservoirs in marginal water reservoirs,tapping potential in thin oil reservoir bottom water reservoirs,and tapping potential in thick oil bottom water reservoirs.YSM oil field designed and implied 6 horizontal wells,with a capacity of 14800 tons,an initial water content of 38%,and a predicted production capacity arrival rate of 80%,which provides reliable technical support for stable production of old oil fields.