气顶边水油藏水平井开发效果影响因素分析

An analysis of the factors to influence development of oil reservoirs with gas cap and edge water by horizontal wells

结合锦州X油田Es3-I断块气顶边水油藏地质特征及开发特点,建立了典型气顶边水油藏地质模型,通过试验设计方法对6个影响油气采收率的因素进行了优化组合,利用数值模拟软件对各个组合方案进行了模拟运算,进而分析了水平井开发效果的影响因素及其敏感程度,结果表明:油环水平井井数对该类油藏原油采收率的影响程度最大,而气顶动用情况则对该类油藏天然气采收率的影响程度最大;油环原油最终采收率对其他影响因素的敏感程度依次为水平段垂向位置、原油采油速度、储层各向异性、气顶动用情况、隔层分布以及隔层分布与气顶动用的交互作用。

In combination with the geology and de velopment features of Es3-I faulted-block oil reser voir with gas cap and edge water in X oilfield, a geo logical model was built for the typical reservoirs with gas cap and edge water. An experimental design method was used to optimize the combination of six factors to influence hydrocarbon recovery, and the optimized combinations were modelled respectively by using a set of numerical simulation software. Fi nally, the factors to influence development of these reservoirs by horizontal wells and their sensitivity were analyzed. The results have shown that the im pact of horizontal well number in the oil ring on oil recovery is the greatest in these reservoirs; and that the exploitation degree of gas cap has the greatest impact on gas recovery in these reservoirs. The oth er factors to affect the oil ring recovery are the verti cal position of horizontal segments, the oil produc tion rate, the reservoir anisotropy, the exploitation degree of gas cap, the barriers and the interaction between the barriers and the exploitation degree of gas cap, with their sensitivity descending.