Research On Development Strategies For Deep Heavy Oil Reservoir With Edge-Bottom Water

Many heavy oil reservoirs in China are prone to edge bottom water intrusion in the process of oilfield development,resulting in increased water content and decreased oil production.Because of the high viscosity of heavy oil,the oil flow ratio is low,the water invasion is more obvious than that of thin oil reservoir.The steam stimulation thermal recovery technologies such as improved oil recovery,because the production speed,water invasion worsen,steam stimulation effect of steam stimulation Wells with different degree of water invasion have obvious difference.Therefore,it is necessary to optimize the injection and production parameters according to the relationship between oil and water and formulate corresponding mining strategies for heavy oil reservoirs with edge bottom water during steam stimulation.This paper first analyzes the influence of the geological characteristics,water invasion characteristics,production dynamics and water invasion on the development effect of the middle and deep boundary bottom water heavy oil reservoirs,such as Gudao Oil Field and Shan Jiasi Oil Field.Based on the calculation of seepage characteristics of heavy oil reservoir with edge bottom water,the water invasion characteristics and influencing factors of heavy oil with edge bottom water were studied.Then,through the edge of bottom water reservoir numerical simulation of heavy oil reservoir with steam stimulation,the distance from the edge water,dip Angle,spacing and other factors on the development of heavy oil reservoir with steam stimulation edge-bottom water effect and the influence law of water invasion,comparison and analysis of steam flooding after steam stimulation,nitrogen flooding and oil transfer different way of development effect,has been clear about the deep side of bottom water in thermal recovery of heavy oil reservoir of reasonable pattern.The results show that the penetration of bottom water in heavy oil reservoirs with middle and deep bottom water is increasing,horizontal Wells should be developed,and the first-line Wells near the edge bottom water should adopt measures such as increasing the amount of drainage and nitrogen injection.Optimize the distance between oil well and edge bottom water when oil well is deployed.The reasonable recovery speed should be controlled during oil well production.Based on the actual reservoir model of the numerical simulation results show that the horizontal well,a line adopts improved drainage amount and nitrogen injection and the control measures such as liquid withdrawal speed compared with conventional steam stimulation can improve the recovery efficiency of oil recovery of 5% ~ 9%...