聚合物微球调驱研究

亚微米聚合物弹性微球具有在油层孔隙中不断运移、封堵、改变注入水渗流方向的特点，从而能提高注入水波及体积。介绍了聚合物弹性微球调驱特点，实验研究了在不同矿化度和温度下微球的吸水膨胀规律以及微球在填砂管中的封堵效果。研究表明，微球具有一定膨胀性，温度越高，矿化度越低，微球膨胀倍数越大；注入微球能显著提高阻力系数，微球含量越高，注入量越大，注入压力越高，后续注水阶段，微球仍能保持较高的残余阻力系数。

A Study on Profile Modification by Polymer Microsphere Injection

The polymer elastic microsphere of sub-micron grade is characterized by improving the waterflood sweep efficiency through its migration in pores, blocking-up leakage layer and changing injected water direction in reservoirs. This paper presents such a polymer features in water injection profile modification and its taking water and expanding properties in different salinities and temperatures as well as the blocking-up effects in sand-packed pipe. The lab study shows that the higher the temperature, the lower the salinity, the larger the times of polymer microsphere expansion. Also, injecting the polymer microspheres can distinctly improve the coefficient of resistance, that is, the higher the concentration of polymer microsphere, the bigger the injection rate of it, the higher the injection pressure. For the succeeding water injection stage, the higher residual coefficient of resistance could be remained by means of this process.