胜利油田普通稠油乳化驱油体系研制及性能评价*
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1.中国石油大学华东石油工程学院

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中图分类号:

TE357.46

基金项目:

国家重点研发计划“稠油化学复合冷采基础研究与工业示范”(项目编号2018YFA0702400),山东省自然科学基金项目(项目编号ZR2019MEE085)


Development and Performance Evaluation of Emulsifying Flooding System for Normal Heavy Oil in Shengli Oilfield
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1. College of Petroleum Engineering,Petroleum University of China

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    摘要:

    针对胜利普通稠油油藏水驱采收率低且热采成本高的问题,乳化降黏驱是提高其采收率、降低生产成本的有效途径。本文利用微动力乳化实验装置,综合考虑两种表面活性剂TB与AC在不同配比下的乳化能力和降低界面张力,构建两种不同性能的乳化驱油体系:TB(0.3%)和TB+AC(0.3%,3:2)。通过多重光散射法分析两种体系和胜利稠油形成乳状液的微观稳定性得出,强乳化超低界面张力体系TB+AC与原油形成乳状液稳定性参数TSI最低,稳定性最好。在此基础上,通过填砂管驱油实验评价两种乳化体系的驱油性能得出,TB+AC体系提高采收率效果最好,达到11.20%,并利用玻璃刻蚀模型对其微观驱油机理进行研究得出,该体系能通过超低界面张力和强乳化性能“拉”残余油,使其发生形变,降低流动阻力和残余油含量;也可以进入油膜深处进一步发生乳化作用使油膜扩张破裂来提高采收率。

    Abstract:

    Aiming at the problems of low water flooding recovery and high thermal recovery cost in Shengli normal heavy oil reservoir, emulsion viscosity reduction flooding is an effective way to improve recovery and reduce production cost. In this paper, considering the emulsifying ability and reducing interfacial tension of two surfactants TB and AC in different ratios, two kinds of emulsion flooding systems with different properties were constructed by using micro dynamic emulsification experimental device: TB (0.3%) and TB + AC (0.3%, 3:2). The micro stability of the emulsion formed by the two systems and Shengli heavy oil was analyzed by multiple light scattering method. The results showed that the stability parameter TSI of the emulsion formed by the strong emulsification and ultra-low interfacial tension system TB + AC and crude oil was the lowest and the stability was the best. On this basis, the oil displacement performance of the two emulsification systems was evaluated by the sand filled tube displacement experiment. The results showed that the TB + AC system has the best EOR effect, reaching 11.20%. The microscopic oil displacement mechanism was studied by using the glass etching model. It was concluded that the system can "pull" the residual oil through ultra-low interfacial tension and strong emulsification, make it deformed, reduce the flow resistance and residual oil content It can also enter into the depth of the oil film to produce further emulsification and make the oil film expand and rupture to enhance oil recovery.

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  • 收稿日期:2020-12-31
  • 最后修改日期:2021-04-06
  • 录用日期:2021-04-19
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