聚驱后高弹性聚合物驱油方法探索

A PROBE INTO HIGH ELASTICITY HPAM FLOODING IN POST-POLYMER FLOODING

聚合物驱后仍有大量油存在于地层中,如何提高聚驱后残余油采收率显得尤为重要。从高弹性聚合物的合成与筛选、支链聚合物与普通聚合物粘弹性对比以及宏观驱替实验,对聚合物驱后高弹性聚合物驱油方法进行了探索,结果表明:(1)溶液的聚合物浓度不变,对应相同剪切速率f,支链聚合物分子量越大,体系的粘弹性越大。(2)在较低的剪切速率下,支链型聚合物具有较大的弹性模量G′。在剪切频率大于9s-1时支链聚合物(x2x)的弹性模量上升的速度大于分子量很高的普通聚合物。(3)支链聚合物在分子量较低的情况下,也能提高原油采收率,若分子量能够提高,其体系的粘弹性会更大,因而可较大幅度提高原油采收率。

There is still much remaining oil in post-polymer flooding, it is a issue how to improve recovery in post-polymer flooding. The authors of this paper research the methods of high elasticity HPAM flooding, including synthesis and choice of high elasticity polymer, difference of HPAM with braches, as well as non-branches and physics simulation experimentation. The research results show (1)The viscosity-elasticity increases as HPAM with branches molecular weight of same concentration and shear-velocity (f). (2)When shear velocity is low, HPAM with branches has bigger elasticity modulus (G′).when shear velocity is over 9s-1 the HPAM with braches x2x is bigger than HPAM with non-branches.(3) When HPAM with branches molecular weight is low, it can also improve oil recovery. If its molecular weight grows bigger, the viscosity-elasticity of its system becomes also bigger and it can entrance higher oil recovery.