95℃高温油藏原位乳化驱油体系评价与应用
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河南省提高石油采收率重点实验室

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TE357.46

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中国石油化工股份有限公司科技专项《高温油藏微乳液驱油提高采收率技术》(项目编号:223142)


Evaluation and Application of In-situ Emulsification Flooding System in 95℃ High Temperature Reservoir
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Key Laboratory of Enhanced Oil Recovery of Henan province

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    摘要:

    针对河南油田高温油藏特点,95℃研制原位乳化驱油体系,并开展性能评价。实验表明,优选表面活性剂具备良好的增溶原油能力,可与原油在地层水盐度条件下原位形成微乳液体系,界面张力超低,抗吸附、耐温性能良好,洗油效率78%;结合微乳液流动性强特点,优选耐温聚合物发挥流度控制,在矿场氧含量0.2mg/L~0.4mg/L,硫含量15mg/L~20mg/L水质条件下,可以实现95℃老化60天粘度保留率100%以上。天然岩心驱油实验表明,原位乳化驱的产出液及岩心切片孔隙中相态特征明显,原油重质组分得到有效驱替,各类型剩余油均有良好动用,具备形成全过程乳化驱替的能力。进一步变浓度梯次注入与调剖段塞组合注入,非均质岩心实验提高采收率28.4%。目前技术已经进入矿场前置段塞注入阶段,数模预测提高采收率8.06个百分点。

    Abstract:

    According to the characteristics of high temperature reservoir in Henan oilfield, in-situ emulsification flooding system was developed at 95℃ and its performance was evaluated. The results showed that the selected surfactant had good solubilization ability of crude oil, which can form micro emulsion system with crude oil in situ, has ultra-low interfacial tension, good adsorption resistance and temperature resistance, and the oil washing efficiency was 78%. Considering the strong fluidity of the micro emulsion, the optimized temperature resistant polymer has high mobility control capability that under the water quality conditions of 0.2mg/L~0.4mg/L oxygen content and 15mg/L~20mg/L sulfur content, the viscosity retention rate that more than 100% can be achieved after aging at 95℃ for 60 days. The experiment of natural core flooding showed that the phase characteristics of the produced liquid and core slice pores in in-situ emulsification flooding were obvious, the heavy components of crude oil were effectively displaced, and all types of remaining oil were well used, which had the ability to form emulsification flooding in the whole process of displacement. Further variable concentration step injection combined with profile control slug injection can increase the recovery rate by 28.4% in heterogeneous core test. At present, the technology has entered the stage of pre-slug injection in the mine field, and the digital-analog predicted enhanced recovery rate of 8.06 percentage points.

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  • 收稿日期: 2024-01-04
  • 最后修改日期: 2024-03-20
  • 录用日期: 2024-04-18
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