致密油藏水平井含水特征及影响因素

针对致密油藏水平井投产后含水较高的问题,以鄂尔多斯盆地D区块42口水平井为研究对象,采用单井采出程度-含水率曲线法开展致密油藏水平井含水特征及影响因素研究。结果表明,致密油藏水平井主要存在3种含水类型,分别是高含水型、中含水型和低含水型。从影响含水特征的地质因素、工程因素和生产因素入手,采用灰色关联度分析法,深入分析了油层厚度、储层非均质程度、压裂段数、压入砂量、压裂排量和泵挂深度等因素对水平井含水变化特征的影响程度并进行了关联排序,明确了致密油藏水平井含水特征主控因素。研究成果可有效指导类似区块水平井开发方案的制定和调整。

Characteristics and influencing factors of water cut of horizontal well in tight reservoir

Aiming at the problem of high water cut in horizontal wells in tight reservoir after production,taking 42 horizontal wells in D block of Ordos basin as an example,the single well production degree-water cut curve method was used to study characteristics and influencing factors of water cut of horizontal well in tight reservoir.The results show that there are three main types of water cut in horizontal wells in tight reservoir,namely high water cut,medium water cut and low water cut.From the geological factors,engineering factors and production factors,which affect water cut characteristics,using grey correlation analysis method,analyzes the degree of reservoir thickness,reservoir heterogeneity,fracturing section number,amount of the sand pressure into formations,fracturing discharge and pump setting depth and other factors on the influence degree of the water cut changes of horizontal wells.It has been clear about the characteristics of dense oil reservoir horizontal well water main controlling factors.The research results clarify the main controlling factors of water cut characteristics of horizontal wells in tight reservoir and effectively guide the formulation and adjustment of similar horizontal well development plan.