95 ℃高温油藏原位乳化驱油体系评价与应用
作者:
作者单位:

作者简介:

通讯作者:

中图分类号:

基金项目:

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
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    针对高温油藏在高采出程度、特高含水阶段水驱、聚驱开发效果差等问题,采用阴、阳离子型表面活性剂复配,研制了配方为 1500 mg/L 聚合物P5+0.3%表面活性剂 S-2原位乳化驱油体系,开展了相态表征,评价了 95 ℃下该原位乳化驱油体系的油藏水质适应性、天然岩心物模驱油效果,采用微观光刻模型分析了驱替的剩余油启动情况,进一步模拟油藏非均质性,评价不同段塞组合方式下原位乳化驱油效果。研究结果表明,表面活性剂S-2具有良好的增溶原油能力,在低质量分数(0.1%~0.3%)条件下可与原油原位形成微乳液体系,乳化粒径主要分布在65~118 nm之间,形成了具有囊泡结构的聚集体;体系油水界面张力超低,抗吸附、耐温性能良好,洗油效率达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作用,在矿场氧含量为0.2~0.4 mg/L、硫含量为 15~20 mg/L 的水质条件下,该乳化驱油体系可以实现 95 ℃老化 60 d黏度保留率在 100%以上。天然岩心驱油实验结果表明,原位乳化驱替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。进一步模拟油藏非均质性,评价不同段塞组合方式下原位乳化驱油效果表明,通过原位乳化驱油体系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25.2百分点以上。综合经济效益及驱油效果,选择0.1 PV调剖段塞+0.45 PV原位乳化体系+0.05 PV调剖段塞组合的注入方式,目前已经进入矿场前置段塞注入,阶段注入0.09 PV,注入压力上升5.0 MPa,数模预测提高采收率8.06百分点。

    Abstract:

    Aiming at the problems of poor flooding effect of water flooding,polymer flooding in high recovery degree and ultra-high water cut stage of high-temperature reservoir,anionic surfactants and cationic surfactants were used in combination,and an in-situ emulsification flooding system composed of 1500 mg/L polymer P5 + 0.3% surfactant S-2 was developed at the temperature of 95 ℃ ,and the phase characterization,reservoir water adaptability,natural core physical simulation oil displacement was carried out,and residual oil start-up mode displaced by microscopic lithography model were evaluated. Further, the heterogeneous core test was carried out to evaluate the displacement effect of the system at different size slug combination. The results showed that the prepared surfactant S-2 had good solubilization ability which can form microemulsion system in low mass fraction 0.1%—0.3% with crude oil in situ,the emulsion particle size were mainly distributed in range of 65—118 nm,forming an aggregate with vesicles,and it had ultra-low interfacial tension,good adsorption resistance and temperature resistance,and the oil washing efficiency was 78%. Considering the strong fluidity of the microemulsion,the optimized temperature resistant polymer had high mobility control capability under the water quality conditions of 0.2—0.4 mg/L oxygen content and 15—20 mg/L sulfur content,the viscosity retention rate achieved more than 100% after aging for 60 days at the temperature of 95 ℃. 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 mobilized,which indicated that the system had the ability to form emulsification flooding in the whole process of displacement. The heterogeneous core test showed that the in-situ emulsion flooding system could increase the recovery rate by more than 25.2 percentage point through its variable concentration step injection combined with profile control slug injection. Considering the economic benefits and oil displacement effect,the combination injection mode of 0.1 PV profile control slug + 0.45 PV in-situ emulsification system + 0.05 PV profile control slug was selected. At present,the technology had entered the stage of pre-slug injection in the mine field,0.09 PV had been injected,the injection pressure increased by 5.0 MPa and the digital-analog predicted enhanced recovery rate was 8.06 percentage points.

    参考文献
    相似文献
    引证文献
引用本文

刘 宇,刘艳华.95 ℃高温油藏原位乳化驱油体系评价与应用[J].油田化学,2024,41(4):686-694.
LIU Yu, LIU Yanhua. Evaluation and Application of In-situ Emulsification Flooding System in 95 ℃High Temperature Reservoir[J]. OILFIELD CHEMISTRY,2024,41(4):686-694.

复制
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:
  • 最后修改日期:
  • 录用日期:
  • 在线发布日期: 2025-01-12
  • 出版日期:
点击这里给我发消息

点击这里给我发消息