中低渗油藏pH敏感聚合物深部调驱技术

发布时间：2018-01-21 20:26

本文关键词： 提高采收率深部调驱物理模拟聚合物 pH敏感性　出处：《特种油气藏》2016年01期 　论文类型：期刊论文

【摘要】：针对中低渗储层常规聚合物注入困难的问题,采用物理模拟的方法研究了p H敏感聚合物的注入性能、封堵性能和调驱效果。结果表明:聚合物在酸性条件下黏度很低,随p H值上升黏度显著提高;阻力系数和残余阻力系数与注入溶液p H值、岩心渗透率和注入速度有关,p H值减小,阻力系数大幅降低而残余阻力系数变化较小,渗透率减小、注入速度降低,阻力系数和残余阻力系数均增大;残余阻力系数受关井时间影响,随时间延长残余阻力系数上升,当时间超过48 h后则基本不变;双岩心渗透率级差为2.6~9.5时,注入调驱液后吸水剖面得到有效调整,低渗岩心剩余油动用率显著提高,总体采收率增值超过20个百分点。该研究对中低渗砂岩油藏深部调驱技术的实践具有一定指导意义。
[Abstract]:Aiming at the difficulty of conventional polymer injection in middle and low permeability reservoirs, the injection performance of p-H sensitive polymer was studied by physical simulation. The results show that the viscosity of the polymer is very low in acidic condition, and the viscosity increases significantly with the increase of pH value. The resistance coefficient and residual resistance coefficient are related to pH value of injected solution, core permeability and injection rate. When the injection rate decreases, both the resistance coefficient and the residual resistance coefficient increase. The residual resistance coefficient is affected by the shut-in time and increases with time, but it is almost unchanged when the time exceeds 48 h. When the permeability difference of double core is 2.6m 9.5, the water absorption profile is adjusted effectively and the remaining oil production rate of low permeability core is improved significantly. The total oil recovery increment is more than 20 percentage points. This study has a certain guiding significance for the practice of deep flooding technology in low and medium permeability sandstone reservoirs.
【作者单位】：中国石油大学;
【基金】：国家自然科学基金“纳米粒子与表面活性剂的协同效应对提高原油采收率的影响”(51474234) 山东省自然科学基金“具有边界层和体相水流流动状态调控作用的低渗透油藏降压增注技术研究”(ZR2012EEM007);山东省自然科学基金重点项目“气溶性起泡剂的构建及其对气驱调控作用研究”(ZR2014EZ002) 中国博士后科学基金“纳米颗粒稳定的乳化溶剂提高水驱稠油油藏采收率研究”(2014M551988)
【分类号】：TE357.46
【正文快照】： 0引言油田开发过程中,长期的注入水冲刷加剧了储层非均质性,使中后期开发阶段出现严重的水窜现象,大幅降低了开发效果[1]。注入聚合物或交联聚合物可有效调整吸水剖面,改善波及系数,提高原油采收率[2-3]。当储层渗透率较低时,常规聚合物的注入需要较高的泵注压力,注入难度大,

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