存在局部连通断层的复合油藏不稳定试井分析及典型曲线拟合方法

TRANSIENT PRESSURE TESTING ANALYSIS AND TYPE-CURVE MATCHING IN A COMPOSITE RESERVOIR WITH A PARTIALLY COMMUNICATING FAULT

很多油藏由断层分割所形成,断层可能封闭也可能泄漏(局部连通)。此外,断层两边的油藏式许具有不同的性质。本文考虑存在一条线性局部连通断层的复合油藏渗流问题,研究其不稳定试井的压力及压力导数特征。通过引入偏移函数,并建立一组理论图版,给出断层的距离和连通程度、渗透率变化的线性不连续边界的距离以及变化程度的典型曲线拟合方法。

Mang reservoirs are faulted.A fault may be sealing or on partially communicated.In addition two parts separated by a fault may have disti- nctly different properties.A composite reservoir with a linear partially eommunicating fault is dealt with in this paper.The pressure and pressure derivative behaviors on transient pressure testing is concerned.By introu- duing a deviation function,a set of new type-curves are presented,which can be used to estimate distance between the well and the fault and communica- ting degree of a partially communicating fault,as well as the distance of a well to the linear discontinuty boundary and permeability ratio of the two parts of the reservoir in the case of a composite reservoir.