水驱后聚驱双层复合油藏试井解释

WELL TEST INTERPRETATION OF THE POLYMER-FLOODED DOUBLE-LAYER COMPOSITE OIL RESERVOIR AFTER WATER DISPLACED

聚合物试井模型研究由于没有同时考虑多层油藏和非牛顿-牛顿复合2个条件的影响,使得海上聚驱油藏实际数据拟合效果不理想。运用数学物理方法、渗流力学理论,基于严格的数学推导,建立了水驱后聚驱双层复合油藏试井解释模型,绘制了井底压力响应特征曲线,并用实例证明了模型的正确性与实用性。结果表明:聚合物初始浓度主要影响内外区共同作用阶段的压力导数上翘幅度,地层流动系数比主要影响双层内区径向流阶段的压力导数曲线上翘幅度,内区半径主要影响压力导数曲线上翘时间。研究成果为同类油藏的试井解释提供了理论指导和技术支持。

Due to the lack of the consideration of two-condition influences of multi-layer oil reservoir and non-New-ton/Newton complex at the same time for the study of the well test model of the polymer, the matched effects of the actual data from the offshore polymer-flooded oil reservoirs were not ideal. With the help of the mathematical-physical methods and hydrodynamic theory, on the basis of the strict mathematic deduction, the well-test interpreting model for the polymer-flooded double-layer composite oil reservoir after water displaced was established, and moreo- ver the characteristic curves of the bottom pressure response were mapped, finally the correctness and applicability of the model were verified by the ease. The results show that the initial concentration of the polymer mainly affects the upwarping amplitude of the pressure derivative in the interaction stage of the internal and external zones, the ra- tio of the formation flow coefficient principally influences the upwarping amplitude of the pressure derivative curve in the radial flow stage of the inner zone in the double layer, the radius of inner zone mainly affects the upwarping time of the pressure derivative. The study achievements have provided the theoretical guidance and technical support for the well test interpretation of the similar oil reservoirs.