聚合物驱油井产能规律研究

Research on productivity law of polymer flooding oil wells

研究聚驱井产能规律,可以为选择采油装置和制定油井工作制度提供参考。实验研究了聚合物溶液的流变性,建立了考虑含水率、流变性、聚合物溶液浓度、黏弹性等因素下的地层流体有效黏度综合模型;其次,在此基础上,以压力与产量的变化作为定解条件,推导了聚合物驱区块见聚油井产能预测模型,并对产能进行了敏感性研究。结果表明,随产出液或注入液稠度系数增加及流性指数降低时,产液量会降低;渗透率降低幅度增加或考虑弹性黏度时,相同井底流压下产液量也会减少;注入聚合物浓度降低或油井含水率增加时,油井产液量增加。此外,不同条件下流入动态曲线相似,可仿照Vogel的方法通过数值模拟研究得到聚合物驱IPR曲线方程。

Research on the productivity law of polymer lfooding wells can provide references for selection of oil production system and formulation of oilwell working system. In the test, the rheology of polymer solution was studied, and an integral model for effective viscosity of formation lfuid was built which took into account such factors as watercut, rheology, solubility of polymer solution, viscoelasticity. Then based on the above, a model for forecasting polymer lfooding oilwell productivity was built for polymer lfooding blocks using changes in pressure and production as deifnite conditions, and sensitivity research was performed for oil productivity. The research result shows that lfuid production will decrease with the increase of consistence coefifcient of produced lfuid and lfow index or with the increase of consistence coefifcient of injected lfuid and decrease of lfow index. And that, lfuid production will decrease at the same bottom lfow-pressure when the permeability decreased degree increases or when viscoelasticity is considered. Oilwell lfuid production will increase with the decrease of polymer concentration or the increase of watercut. In addition, the inlfow performance relationship (IPR) curves are similar under different conditions, so the polymer lfooding IPR curve equation may be obtained through numerical simulation research using Vogel method.