水包油乳状液驱替普通稠油研究
发布时间：2019-03-02 18:27
【摘要】：我国稠油资源十分丰富,但总体采收率较低,因此如何进一步提高普通稠油油藏采收率是开发中亟待解决的技术难题。本文对水包油乳状液提高普通稠油油藏的采收率进行了可行性研究。论文首先对乳状液驱油体系进行了配方研究,研究结果表明,用质量分数大于0.1%的表面活性剂TA-13制备的乳状液,可以稳定15天以上,但是乳状液耐盐性较差;在表面活性剂TA-13溶液中加入纳米颗粒之后,制成的乳状液稳定性和耐盐性均得到显著提高,且当纳米颗粒质量分数超过0.3%时,乳状液的粘度显著上升。物理模拟实验表明,水包油乳状液能降低岩心渗透率。就封堵能力而言,表面活性剂与纳米颗粒协同稳定的乳状液有更好的封堵能力。就驱油效果而言,表面活性剂与纳米颗粒协同稳定的乳状液也具有更好的驱油效果,更广的渗透率使用范围。微观可视化实验表明,乳状液一方面可以渗入到稠油当中,抑制低粘度驱油体系的指进。另一方面降低了与前沿相接触的稠油的粘度,提高了稠油的流度。另外,乳状液中的表面活性剂,可将稠油乳化成水包油的乳化液滴,进一步提高了洗油效率。
[Abstract]:China is rich in heavy oil resources, but the overall recovery rate is relatively low. Therefore, how to further improve the recovery rate of ordinary heavy oil reservoirs is a technical problem to be solved urgently in the development of heavy oil reservoirs. In this paper, the feasibility of water-in-oil emulsion to improve the recovery of ordinary heavy oil reservoirs is studied. At first, the formulation of emulsion flooding system was studied. The results showed that the emulsion prepared by surfactant TA-13 with mass fraction greater than 0.1% could be stable for more than 15 days, but the salt tolerance of emulsion was poor. When nano-particles were added to surfactant TA-13 solution, the stability and salt tolerance of the emulsion were improved significantly, and the viscosity of emulsion increased significantly when the mass fraction of nano-particles was more than 0.3%. Physical simulation experiments show that water-in-oil emulsion can reduce core permeability. As far as plugging ability is concerned, surfactant and nano-particles have better plugging ability in synergistic and stable emulsion. As far as the oil displacement effect is concerned, the synergetic and stable emulsions of surfactant and nano-particles also have better oil displacement effect and wider application range of permeability. The microscopic visualization experiment shows that the emulsion can infiltrate into heavy oil on the one hand, and inhibit the fingering of low viscosity oil displacement system on the one hand. On the other hand, the viscosity of heavy oil in contact with front phase is reduced, and the fluidity of heavy oil is improved. In addition, surfactant in emulsion can further improve washing efficiency by emulsifying heavy oil into water-in-oil emulsion droplets.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.46
本文编号：2433340
[Abstract]:China is rich in heavy oil resources, but the overall recovery rate is relatively low. Therefore, how to further improve the recovery rate of ordinary heavy oil reservoirs is a technical problem to be solved urgently in the development of heavy oil reservoirs. In this paper, the feasibility of water-in-oil emulsion to improve the recovery of ordinary heavy oil reservoirs is studied. At first, the formulation of emulsion flooding system was studied. The results showed that the emulsion prepared by surfactant TA-13 with mass fraction greater than 0.1% could be stable for more than 15 days, but the salt tolerance of emulsion was poor. When nano-particles were added to surfactant TA-13 solution, the stability and salt tolerance of the emulsion were improved significantly, and the viscosity of emulsion increased significantly when the mass fraction of nano-particles was more than 0.3%. Physical simulation experiments show that water-in-oil emulsion can reduce core permeability. As far as plugging ability is concerned, surfactant and nano-particles have better plugging ability in synergistic and stable emulsion. As far as the oil displacement effect is concerned, the synergetic and stable emulsions of surfactant and nano-particles also have better oil displacement effect and wider application range of permeability. The microscopic visualization experiment shows that the emulsion can infiltrate into heavy oil on the one hand, and inhibit the fingering of low viscosity oil displacement system on the one hand. On the other hand, the viscosity of heavy oil in contact with front phase is reduced, and the fluidity of heavy oil is improved. In addition, surfactant in emulsion can further improve washing efficiency by emulsifying heavy oil into water-in-oil emulsion droplets.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.46
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