聚合物凝胶调剖剂配方优选及性能评价

发布时间：2019-03-09 14:38

【摘要】：聚合物凝胶调剖技术是油田改善后期注水开发效果、保持稳产的有效手段。本文通过一系列单因素变量实验研究了多个因素对聚合物凝胶调剖剂的影响,从而确定了适合石南4井区头屯河组油藏的调剖剂配方并进行了性能评价。结果表明:在单因素变化情况下,聚合物凝胶调剖剂成胶强度随着聚合物、交联剂、稳定剂的浓度的增大而增大,随着水质矿化度的浓度增大而减小;成胶时间随着聚合物、交联剂、水质矿化度的浓度增大而减小,随着稳定剂浓度的增大而基本无变化。成胶强度随着老化时间、温度、剪切强度的增大而减小。随着调剖剂注入量的增大,阻力系数和残余阻力系数而逐渐增大,而且二者差距幅度加大;封堵率先缓慢上升,后快速上升,最后趋于平缓。针对石南4井区头屯河组油藏,建议采用的调剖剂配方为:聚合物(2500万相对分子量)浓度1500 mg/L、交联剂0.3%、稳定剂0.1%、水质矿化度26 g/L;注入方式为:前置段塞0.15 PV(孔隙体积)+主体段塞0.25 PV+保护段塞0.1 PV。
[Abstract]:Polymer gel profile control technology is an effective means to improve the water injection development effect and maintain stable production in the later stage of oil field. In this paper, the influence of several factors on polymer gel profile control agent has been studied by a series of single factor variable experiments, and the formulation of profile control agent suitable for Toutunhe formation reservoir in Shinan 4 well area has been determined and its performance has been evaluated. The results show that the gelatinization strength of polymer gel profile control agent increases with the concentration of polymer, cross-linking agent and stabilizer, and decreases with the increase of salinity of water quality under the condition of single factor change. The gelation time decreased with the increase of the concentration of polymer, crosslinking agent and water quality, but remained unchanged with the increase of stabilizer concentration. The gelatinization strength decreases with the increase of aging time, temperature and shear strength. With the increase of profile control agent injection, the resistance coefficient and residual resistance coefficient increased gradually, and the gap between them increased, and the plugging increased slowly at first, then rose rapidly, and finally tended to smooth. In view of the reservoir of Toutunhe formation in Shinan 4 well area, the suggested formulation of profile control agent is as follows: the concentration of polymer (25 million relative molecular weight) 1500 mg/L, crosslinker 0.3%, stabilizer 0.1%, water salinity 26 g / L; The injection mode is as follows: front slug 0.15 PV (pore volume) main slug 0.25 PV protection slug 0.1 PV.
【作者单位】：中国科学院渗流流体力学研究所;中国科学院大学;中国石油勘探开发研究院廊坊分院;清华大学环境学院;
【基金】：国家科技重大专项(2011ZX05013-006) 中国石油科技攻关项目(2014B-1203)
【分类号】：TE39

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