缔合聚合物驱在鲁克沁中区油藏的可行性研究

Feasibility Study of Associated Polymer Flooding in Lukeqin Reservoir District

刘清栋 王晓燕 曹少余 王崇先 姚普勇

LIU Qingdong WANG Xiaoyan CAO Shaoyu WANG Chongxian YAO Puyong

针对鲁克沁中区油藏非均质性严重、水油流度比大和地层水矿化度高的特点，研究了疏水缔合聚合物AP-P8 在该油藏条件下的黏度、溶解性、抗剪切性和热稳定性，考察了AP-P8 的驱油性能，并在现场进行了应用。研究结果表明，配液水为注入水（矿化度约80 g/L）、温度为78℃时，AP-P8 的增黏性能明显好于常规聚合物，AP-P8 溶液黏度随温度升高而降低，用注入水配制的2 g/L AP-P8 溶液在100℃时的黏度为64.5 mPa·s；室温下AP-P8 在注入水中的溶解性较好，溶解时间为2.8 h；AP-P8 抗剪切性较好，2.5 g/L AP-P8 溶液剪切后的黏度保留率为54.2%。随AP-P8 浓度的增加，岩心阻力系数和残余阻力系数增加，有利于提高原油的采收率；AP-P8 可在水驱基础上提高稠油采收率10.2%；现场试注试验结果表明，AP-P8 的注入性良好，常温配液黏度为100 mPa·s，注聚稳定压力27.5 MPa。AP-P8 满足鲁克沁中区油藏条件对聚合物驱性能的要求，应用时可以直接用注入水配液。图7 表5 参15

Aiming at the characteristic of Lukeqin heavy oil reservoir，including serious geological heterogeneity，unfavorable water-oil mobility ratio，and high formation water salinity，the viscosity，solubility，shear resistance and thermal stability of the hydrophobic association polymer，AP-P8，was researched. The oil displacement performance of AP-P8 was studied，and field application was carried out. The results showed that the viscosity of AP-P8 was significantly better than that of conventional polymers when the preparing water was injection water with 80 g/L mineralization and the temperature was 78℃. The viscosity of AP-P8 solution decreased with the increase of temperature. The viscosity of 2 g/L AP-P8 solution was 64.5 mPa·s when the temperature was 100℃ and the preparing water was injection water. The solubility of AP-P8 was good at room temperature，and the dissolution time was 2.8 h. The retention rate of shear viscosity was 54.2% when the mass concentration of AP-P8 was 2.5 g/L， indicating good shear resistance. With increasing concentration of AP-P8，the core resistance coefficient and residual resistance coefficient increased，which was conducive to improve oil recovery. AP-P8 polymer could increase oil recovery by 10.2% on the basis of water flooding. Field test results showed that the injection of AP-P8 was good with 100 mPa·s solution viscosity at room temperature and 27.5 MPa polymer injection pressure. AP-P8 met the flooding performance requirements of Lukeqin central reservoir conditions，which could be directly prepared by injection water.

10.19346./j.cnki.1000-4092.2017.01.023