有机互溶剂对碳化智能水-原油界面张力的影响研究
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1.中国石油长庆油田分公司第九采油厂;2.北京凯博瑞石油科技有限公司

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中国石油长庆油田公司科技发展部项目“长庆气田稳产及提高采收率技术研究”(2016E-0509)


Effect of organic mutual solvent on interfacial tension of carbonized smart water-crude oil
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Beijing Kaiborui Petroleum Technology Co,Ltd,Xi’an

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    摘要:

    碳化智能水驱是一种新型化学联合采油方法,如何提高CO2在盐水中的溶解度,是有效降低油水界面张力的关键。将高矿化度地层水稀释后作为智能水,在不同压力下向含有不同浓度互溶剂的智能水中添加CO2,通过开展界面张力测定实验,研究互溶剂对智能水和碳化智能水与原油界面张力的影响,明确盐度、互溶剂浓度及压力对油水界面张力的影响。实验结果表明,混合液和碳化智能水的密度随互溶剂浓度的增加而降低。但随着压力的增加,混合液密度略微增大,而碳化智能水密度降低。恒定压力下混合液与原油之间界面张力随混合液中互溶剂浓度的增加而降低,随盐度的降低而降低,但受压力影响较小,DME作用下混合液的界面张力的降低幅度大于甲醇。当智能水中添加CO2后能够进一步降低油水界面张力,碳化智能水与原油的界面张力随互溶剂浓度的增加而降低,随盐度和压力的降低而降低。其中,10%地层水添加15%DME后继续添加9MPaCO2的碳化智能水与原油的界面张力最小,界面张力降低幅度达到88.2%。研究成果为高含水老油田持续开发和提高水驱采收率提供了新方法。

    Abstract:

    Carbonized intelligent water flooding is a new chemical combined oil recovery method. How to improve the solubility of CO2 in salt water is the key to effectively reduce the interfacial tension between oil and water. The formation water with high salinity was diluted as smart water, and CO2 was added to the smart water with different concentrations of mutual solvent under different pressures. The interfacial tension measurement experiment was carried out to study the influence of mutual solvent on the interfacial tension between smart water and carbonized smart water and crude oil, and the influence of salinity, mutual solvent concentration and pressure on the interfacial tension of oil and water was clarified. The experimental results show that the density of the mixed liquid and carbonized smart water decreases with the increase of the organic mutual solvent concentration, and with the increase of the system pressure, the density of the mixed liquid slightly increases, while the density of the carbonized smart water decreases. Under constant pressure, the interfacial tension between the mixed liquid and crude oil decreases with the increase of the mutual solvent concentration in the mixed liquid, and decreases with the decrease of the salinity, but it is less affected by the system pressure, and the decrease of the interfacial tension of the mixed liquid under DME is greater than that of methanol. When CO2 is added to smart water, the interfacial tension of oil and water can be further reduced. The interfacial tension between carbonized smart water and crude oil decreases with the increase of mutual solvent concentration, and decreases with the decrease of salinity and system pressure. Among them, the interfacial tension between the carbonized smart water and crude oil is the smallest when 10% formation water is added with 15% DME and then 9MPa CO2 is added, and the interfacial tension is reduced by 88.2%. The research results provide a new method for the continuous development of old oil fields with high water cut and the improvement of water flooding recovery.

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  • 收稿日期: 2024-12-02
  • 最后修改日期: 2024-12-29
  • 录用日期: 2025-01-24
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