聚合物驱两相流试井参数敏感性

考虑油水两相、生产历史、油藏平面非均质性、井筒储存和表皮效应等因素,建立了生产历史阶段聚合物驱数学模型和不稳定试井阶段的流线模型,用流管法对解释模型进行了数值求解.研究表明:随着油水粘度比的增大,压力及压力导数曲线向上平移,随着生产时间的增加,储层的有效渗透率降低,当高渗透条带沿主流线方向分布时,注水井压降导数曲线反映不出油水前缘的影响,而随着聚合物注入浓度的增大,压力导数曲线下凹出现的越来越早.

Sensitivity of Testing Parameters of a Two Phase Well with Polymer Flooding

Considering factors as two-phase of oil and water, production history, areal heterogeneity of the reservoir, well-bore storativity and skin, we establish a mathematical well testing model with polymer flooding in producing period and a streamline model for unsteady well testing. Numerical solutions are gained by a stream-tube method. It shows that the pressure derivative curve moves upward with the increase of the ratio of oil/water viscosity. The effective permeability of formation decreases with an increase of production time. The effect of water-oil front cannot been reflected from the derivative curve in the water well drawdown log-log plot when a high permeable zone is distributed along the main streamline. The concave in derivative curve appears earlier with the increase of concentration of polymer injected.