海上稠油油田深部调驱选井决策方法研究

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

海上油田高强度的合注合采导致优势通道普遍发育,开展深部调驱是油田稳产的关键。提出了一种适用于海上稠油油田的深部调驱选井决策方法,从静态指标、生产动态指标和动态监测指标出发,全面筛选、构建了选井决策的评价指标体系;利用隶属函数实现指标定量计算,利用模糊层次分析法分步确定指标权重,从而计算综合评判因子进行选井。矿场应用表明,调驱井压降变缓,措施区块增油降水效果显著,含水下降1.2%,累计增油6.10×10~4 m^3,提高采收率0.21%,充分证明了该方法的可靠性。

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.