聚合物驱油试井解释分析方法及应用

Well Test Analysis Method for Polymer Flooding and Its Applications

针对目前大庆油田聚合物驱油流体特性 ,研究建立了适合聚合物流体流变性的幂律型非牛顿流体试井解释模型 ,并应用有限元法对所建立的模型根据内外边界条件进行了数值求解。通过现场实例分析 ,证明该方法较好地解决了聚合物驱油流体的试井问题 ,曲线拟合效果较好 ,并可以通过试井曲线的形态变化 ,分析聚合物流体在地层中的推进情况。

Established is a well test interpretation model of non-Newtonian Power-law fluids which is adaptable to polymer fluids rheological property according to current polymer flooding fluid properties in Daqing Oilfield. An adaptive technique, generated from finite element non-structural triangular grids based on the improved Delaunay's triangulated Watson algorithm, is used for grids divisions of the studied reservoirs. On the basis of the divisions of non-structurized grids, theoretical charts are obtained from numerical calculations by using assumption conditions of physical model and boundary conditions of the reservoirs. Field examples proved this technique has better resolved the well test problems in polymer flooding fluids, and provided better fitting curves. The polymer fluids advancement in formation is analysed through morpho-variations of well test curves.