Practice On A Black Of Sandy Conglomerate Heavy Oil Reservoir In Karamay Oilfield

Heavy oil reservoir of lower K Formation in the S District of Karemary Oilfield dominated by sandy conglomerate and some conglomerate. Compared with ordinary sandstone heavy oil reservoir, its permeability is lower and there is little successful steam flooding experience of it. In order to discuss the feasibility of turning steam sock to steam flooding on it a group of well began to convert to steam flooding successively in 2003. Because of poor effect of steam flooding effect it needs to find the main factors affecting steam flooding effect and put forward reasonable production measures.In this paper geological characteristics and development effect of steam flooding are analyzed. Well group of test area were classified according to the development effect. This paper respectively studied the influence of geological characteristics and development system on the performance of steam flooding and determined influencing factor and effect rule. The results show that large well spacing and unbalanced gas injection profile were the main factors leading to poor effect of steam flooding. Potential of test area was analyzed by reservoir methods and numerical simulation. The results show that current recovery is low, residual oil saturation is high between injection well and production well and there are thick, widespread and low producing degree position in vertical. Infilling adjustment should be taken on original well pattern for improving development effect.