大庆头台低渗透油藏液流转向剂筛选及其增油效果评价

发布时间：2018-04-20 05:01

本文选题：大庆头台油田 + 低渗透油藏　；参考：《大庆石油地质与开发》2017年03期

【摘要】：大庆头台油田源13西块PI组油层为低渗油藏,目前已经处于高含水开发期。为进一步通过深部液流转向措施扩大中低渗透层波及体积,以目标油藏储层和流体为模拟对象,以阻力系数、残余阻力系数和采收率为评价指标,开展了深部液流转向剂筛选及其增油效果评价实验研究。结果表明:与目标油藏储层相适应的聚合物相对分子质量不大于800×10~4,聚合物质量浓度不大于900 mg/L,交联剂中聚合物与Cr~(3+)聚合物凝胶的质量浓度比为(180~270)∶1;在相对分子质量和质量浓度相同条件下,与聚合物溶液相比,Cr~(3+)聚合物凝胶不仅阻力系数和残余阻力系数较大,而且残余阻力系数大于阻力系数,表现出优良的液流转向增油效果;随着聚合物凝胶段塞尺寸增加,调驱采收率增大但增幅逐渐减小,适宜段塞尺寸为0.1~0.15 PV。
[Abstract]:Pi formation of West Block Yuan-13 in Daqing Toutai Oilfield is a low permeability reservoir and is in high water cut stage. In order to further expand the sweep volume of low and medium permeability layers through the deep liquid flow diversion measures, the target reservoir reservoir and fluid are taken as the simulation object, and the resistance coefficient, residual resistance coefficient and oil recovery are taken as the evaluation indexes. The screening of deep liquid flow steering agent and the evaluation of its oil increasing effect were studied. The results show that the relative molecular weight of polymer is not more than 800 脳 10 ~ (4), the mass concentration of polymer is not more than 900 mg / L, the ratio of polymer to Cr~(3) polymer gel in crosslinking agent is 180 ~ 270: 1. With the same mass and mass concentration, Compared with the polymer solution, the polymer gel not only has larger resistance coefficient and residual resistance coefficient, but also has higher residual resistance coefficient than the resistance coefficient, which shows excellent oil increasing effect with the increase of polymer gel slug size. The oil recovery factor increases but the increase decreases gradually, and the appropriate slug size is 0.1g / 0.15 PV.
【作者单位】：大庆头台油田开发有限责任公司;东北石油大学提高油气采收率教育部重点实验室;
【基金】：国家自然科学基金“抗盐型聚合物油藏适应性及其改进方法基础研究”(51574086)
【分类号】：TE348

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