多层合试的表皮系数校正

海上油气田开发成本高,大多数开发井试井时均采用多层合试方法。对于多层合试的试井分析,解释方法和流程均与普通单层测试时完全一样,解释的表皮系数并不能真正反映该套储集层的平均表皮系数。为获取储集层真实的流动系数和产能,从理论角度出发,在无因次渗流模型中,通过引入层间干扰等效表皮系数,提出一种新的表皮系数校正方法,并用实例进行验证。目前该方法已经在渤海油田广泛应用,具备一定的适应性及推广性。

Well Test Skin Correction of Multilayer Joint Test

Because development cost is enormous in offshore oil and gas fields, multi-layer joint well test is popular-ly utilized with most of production wells.As for multi-layer joint well test analysis, interpretation method and proce-dure are the same as the general interpretation of single layer test, the skin factor interpreted is not the true skin factor.This problem was discussed in this paper by introducing an equivalent skin factor correction, which is proved as a kind of new correction method by introducing the inter layer interference equivalent skin factor in dimensionless seepage model to achieve real flow coefficient and capacity of reservoir and cited with examples.This new method has been utilized in Bohai oilfield widely and can be extended to certain extent.