Alzaabi Mohamed Adel, Gausdal Jacobsen Jørgen, Masalmeh Shehadeh, Al Sumaiti Ali, Pettersen Øystein, Skauge Arne
Department of Chemistry, University of Bergen, 5007 Bergen, Norway.
Norwegian Research Center, 5008 Bergen, Norway.
Polymers (Basel). 2020 Apr 3;12(4):801. doi: 10.3390/polym12040801.
Polymer flooding is an enhanced oil recovery (EOR) process, which has received increasing interest in the industry. In this process, water-soluble polymers are used to increase injected water viscosity in order to improve mobility ratio and hence improve reservoir sweep. Polymer solutions are non-Newtonian fluids, i.e., their viscosities are shear dependent. Polymers may exhibit an increase in viscosity at high shear rates in porous media, which can cause injectivity loss. In contrast, at low shear rates they may observe viscosity loss and hence enhance the injectivity. Therefore, due to the complex non-Newtonian rheology of polymers, it is necessary to optimize the design of polymer injectivity tests in order to improve our understanding of the rheology behavior and enhance the design of polymer flood projects. This study has been addressing what information that can be gained from polymer injectivity tests, and how to design the test for maximizing information. The main source of information in the field is from the injection bottom-hole pressure (BHP). Simulation studies have analyzed the response of different non-Newtonian rheology on BHP with variations of rate and time. The results have shown that BHP from injectivity tests can be used to detect in-situ polymer rheology.
聚合物驱是一种强化采油（EOR）工艺，在该行业中受到越来越多的关注。在这个过程中，水溶性聚合物被用来增加注入水的粘度，以改善流度比，从而提高油藏波及效率。聚合物溶液是非牛顿流体，即它们的粘度取决于剪切力。聚合物在多孔介质中高剪切速率下可能会出现粘度增加，这会导致注入能力下降。相反，在低剪切速率下，它们可能会出现粘度损失，从而提高注入能力。因此，由于聚合物复杂的非牛顿流变学特性，有必要优化聚合物注入性测试的设计，以增进我们对流变行为的理解，并改进聚合物驱油项目的设计。本研究一直在探讨能从聚合物注入性测试中获得哪些信息，以及如何设计测试以获取最大信息量。该领域的主要信息来源是注入井底压力（BHP）。模拟研究分析了不同非牛顿流变学在速率和时间变化时对井底压力的响应。结果表明，注入性测试得到的井底压力可用于检测原位聚合物流变学特性。
