Well selection decision method of indepth profile control and displacement in offshore heavy oilfield

In offshore heavy oilfield,the commingled injection and production pattern with high strength will lead to the general development of preferential migration passage,and deep profile control is the key to realize the stable production of oil field.A well selection decision method of in-depth profile control and displacement which was suitable for offshore heavy oilfield was proposed.Starting from the static index,production performance index and dynamic monitoring index,through comprehensive screening,the evaluation index system of the selection well decision was established.Through membership function,the quantitative calculation of these indexes was realized.By using the fuzzy analytic hierarchy process,the index weight was determined step by step,and then the decision model of selecting well which could calculate the comprehensive evaluation factors was established.The field application results indicated the effect of increasing oil and decreasing water was good,the water decreased by 1.2%,the increased oil was of 6.10×10~4 m~3 and the oil recovery increased by 0.21%,which fully proved the reliability of the method.