不同界面性质表面活性剂体系提高采收率作用效果和机理研究
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1.长庆油田分公司油气工艺研究院;2.中国石油勘探开发研究院

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中国石油股份公司重大专项项目“页岩油高效压裂改造技术研究与应用”(编号2019E-2606)


The Effect and Mechanism of Surfactants with Different Interfacial Properties to Improve Oil Recovery
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    摘要:

    以长6的低渗致密储层为研究对象,选用两种具有不同界面性质的自制表面活性剂体系S1(改润湿性能力强)和S2(超低界面张力),分别用核磁共振手段表征了其静态渗吸和动态渗吸效果,并采用2.5维微观模型研究了其驱油过程,分析了具有不同界面性质表面活性剂体系的提高采收率作用效果和作用机理。结果表明:S1和S2均具有较好的增采效果,渗吸为水进入小孔隙将油置换到大孔隙的过程,表面活性剂可大幅促进小孔隙采出;驱油时形成优势通道明显,可实现润湿反转,存在附加渗吸作用,大幅增大波及体积和洗油效率,并能够将原油分散为小尺度状态。其中,改润湿性能力更强的S1毛管动力更大,对小孔动用程度更高,但采出速度较慢,驱替时存在的附加渗吸作用更强;可实现超低界面张力的S2油相流动阻力更小,渗吸速度快,采收率可更快达到平衡。

    Abstract:

    Taking the low permeability tight reservoir of Chang 6 as the research object, two self-made surfactants S1 (with strong modification wettability) and S2 (ultra-low interfacial tension) with different interfacial properties were selected. Their static and dynamic permeability effects were characterized by NMR, and their oil displacement process was studied by 2.5-dimensional micro model, The EOR effect and mechanism of surfactants with different interfacial properties are analyzed. The results show that both S1 and S2 have good enhanced production effects. Imbibition is a process in which water enters small pores to replace oil to large pores. Surfactants can greatly promote the production of small pores; During oil flooding, the dominant channel is obviously formed, which can realize wettability reversal, and has additional imbibition effect, which greatly increases the sweep volume and oil washing efficiency, and can disperse the crude oil into small scale state. Among them, the S1 capillary with stronger wettability ability is more powerful and has a higher degree of mobilization of small holes, but the recovery rate is slower, but the additional imbibition during displacement is stronger, which can achieve ultra-low interfacial tension.The S2 with ultra-low interfacial tension can achieve smaller oil phase flow resistance, faster imbibition speed, and faster recovery to reach equilibrium.

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  • 收稿日期: 2021-11-20
  • 最后修改日期: 2022-02-09
  • 录用日期: 2022-02-13
  • 在线发布日期: 2022-06-24
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