摘要
针对吐哈雁木西油田高矿化度的油藏条件,利用均质岩心评价聚合物微球封堵性能和缓膨效果,对4种微球的水化膨胀规律进行研究。实验结果表明,在注入水配制微球条件下,微球C膨胀倍数为2.61~2.66,微球A为1.32~1.70,微球B粒径逐渐减小;在软化水条件下,微球A2(1 800 mg/L)膨胀倍数为3.92~4.27,微球A1较微球A2缓膨性稍差,但水溶性较好,微球B粒径呈现先减小后趋于稳定的变化趋势,微球C水化膨胀作用效果较差;软化水配制微球会造成部分微球材料溶解于水中,致使微球数量减少,其中微球C最明显,会发生絮状沉淀,搅拌后絮状物消失;注入水配制微球C会发生漂浮现象;与微球C相比较,岩心孔隙内微球A2引起的注入压力、阻力系数和残余阻力系数较大,表明微球A2水化膨胀效果较好,液流转向能力较强。
Aiming at the reservoir conditions with high salinity in Yanmuxi Oilfield,Tuha,the plugging performance and retarding expansion effect of polymer microspheres were evaluated by homogeneous cores,and the hydration expansion rules of four microspheres were studied. The results showed that the swelling ratio of microspheres C was 2.61-2.66,and A was 1.32-1.70,while the diameter of microspheres B was gradually reduced. The swelling ratio of microspheres A2(1 800 mg/L) was 3.92-4.27 under softening water condition. The swelling ratio of microspheres A1 was slightly lower than that of microspheres A2,but the water solubility was better. The particle size of microspheres B showed a trend of decreasing ?rst and then tending to be stable. The effect of hydration and expansion of microspheres C was poor. Compared with injected water,softening water could cause some microspheres to dissolve in water and decrease the number of microspheres,especially the microspheres C. In addition,Floating phenomenon would occur in the preparation of the microspheres C by water injection,and flocculent precipitation would occur in the softened water microspheres C and disappear after stirring. Compared with the microspheres C,the injection pressure,resistance coef?cient and residual resistance coef?cient caused by the microspheres A2 in core pores were larger,indicating that the hydration expansion effect was better and the liquid ?ow turning ability was stronger.
引文
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