低界面张力小分子驱油剂提高低渗透油藏采收率技术
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长江大学石油工程学院

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国家自然科学基金(51774049);国家重点实验室开放课题项(PPC2017005)


Low interfacial tension small molecule oil displacement agent to improve oil recovery in low permeability reservoir
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oilfield chemistry

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    摘要:

    针对低渗油藏注入性差、洗油效率低,水驱无法有效提高采收率等问题,本文提出了一种低界面张力小分子驱油剂(LST)提高低渗透油藏采收率新技术,评价了该驱油剂的界面活性、增黏性、乳化性、润湿性及其油藏环境适应性和驱油效果。结果表明,该驱油剂具有良好的界面活性和增黏性,在矿化水中质量分数为0.4%时,其油水界面张力就低达0.012mN/m-1,且黏度与油藏原油黏度相近(3.4mPa?s);该驱油剂还具有较好的油水乳化能力,可改善油藏水润湿性,且矿物静态吸附对其界面活性及增黏性影响小;可以实现低剂量或低成本有效提高水驱采收率。注入0.4%LST(0.4PV),可使均质岩心(50mD)水驱采收率提高11.21%,非均质岩芯(级差3-10)水驱综合采收率提高6.55-19.4%,且随岩心非均质性增强其改善驱油效果愈明显。表明LST可对大孔道进行有效封堵并调节驱替流体流度,从而有效启动低渗小孔道中残余油;展示其在低渗非均质油藏化学驱提高采收率方面广阔的应用前景。

    Abstract:

    Poor injection of low permeability reservoirs, low efficiency of wash oil, water flooding can effectively improve recovery factor and so on question, this paper proposes a low interfacial tension of small molecular oil displacement agent (LST) new technology improve the recovery factor of low permeability reservoir, the interfacial activities of evaluation of the oil displacement agent, viscosity, emulsification, wettability and its reservoir environment adaptability and oil displacement effect. The results show that the oil displacement agent has good interfacial activity and viscosity. When the mass fraction is 0.4%, the oil-water interfacial tension is as low as 0.012mN/m-1, and the viscosity is close to that of the reservoir oil (3.4mPa?s). The oil displacement agent also has good oil-water emulsification ability, little influence of static adsorption on interfacial activity and viscosity enhancement, and good hydrophilic wettability, which can effectively improve water recovery efficiency at low dose or cost. By injecting 0.4%LST(0.4PV), the water flooding recovery of homogeneous core (50mD) can be increased by 11.210%, and the comprehensive water

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  • 收稿日期: 2022-10-26
  • 最后修改日期: 2022-12-26
  • 录用日期: 2023-01-07
  • 在线发布日期: 2023-08-03
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