多尺度冻胶分散体的制备机理

发布时间：2018-07-14 11:17

【摘要】：常规提高采收率方法因聚合物耐剪切耐地层理化性质差、聚合物微球合成工艺复杂成本高、预交联颗粒注入性差等问题,限制了油藏适用范围。针对这一技术难题,基于地面制备的本体冻胶体系,建立了规模化高效制备多尺度冻胶分散体的工艺新方法,并探索了其制备机理。研究结果表明:制备的多尺度冻胶分散体为形状规则、粒径可控(650~5 000nm)的水相分散颗粒体系,具备低黏度,表面带负电(-20~-35 mV)的特点。本体冻胶强度、剪切速率、剪切时间和制备方式均会影响多尺度冻胶分散体的制备,其中剪切速率是制备多尺度冻胶分散体的主控因素。多尺度冻胶分散体制备包括本体冻胶的形成和多尺度冻胶分散体的剪切成形两部分,本体冻胶的形成过程包括诱导期、快速交联期、慢速增长期、稳定期4个化学交联阶段;多尺度冻胶分散体的剪切成形过程包括破碎磨圆区、颗粒进一步磨碎区、颗粒均一区3个物理剪切阶段,整个剪切过程持续3~15 min即可完成,进而实现多尺度冻胶分散体的高效制备。
[Abstract]:The conventional methods for improving oil recovery are due to the poor physical and chemical properties of polymer shear resistance and formation resistance, the high complex cost of polymer microspheres synthesis process and the poor injectability of premixed particles, etc., which limit the application scope of reservoir. In view of this technical problem, based on the bulk gel system prepared on the ground, a new process for the preparation of multi-scale gel dispersions on a large scale and high efficiency was established, and the preparation mechanism was explored. The results show that the multi-scale gel dispersions are regular in shape and have controllable particle size (650 ~ 5 000nm) in aqueous phase with low viscosity and negative charge (-20 ~ 35 MV) on the surface. The gel strength, shear rate, shear time and preparation method all affect the preparation of multi-scale gel dispersion, and the shear rate is the main factor controlling the preparation of multi-scale gel dispersion. The preparation of multi-scale gel dispersion consists of the formation of bulk gel and the shear forming of multi-scale gel dispersion. The forming process of bulk gel consists of four chemical crosslinking stages: induction period, rapid cross-linking period, slow increasing period and stable phase. The shear forming process of the multi-scale gel dispersion consists of three physical shearing stages, including the broken round area, the further grinding zone, and the three physical shearing stages in each region. The whole shearing process can be completed in a continuous period of 3 ~ 15 min. Furthermore, the preparation of multi-scale gel dispersion is realized.
【作者单位】：中国石油大学石油工程学院;中国地质大学能源学院;
【基金】：国家重点基础研究发展计划(973)项目(2015CB250904) 中国博士后科学基金项目“冻胶分散体非均相复合调控体系相互作用机制研究”(2016M602228)资助
【分类号】：TE39

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