一种超临界二氧化碳增稠剂的合成条件优化及室内驱油效果评价
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1.中国石油大学(北京)非常规油气科学技术研究院;2.东北石油大学化学化工研究院;3.成都理工大学能源学院;4.中国石油勘探开发研究院

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国家自然科学基金项目“驱油相自扩大波及体积提高采收率新方法”(项目编号:51834005)


Optimization of synthesis conditions and evaluation of indoor oil displacement effect of a supercritical carbon dioxide thickener
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    摘要:

    二氧化碳驱(CO2)是三次采油基础上进一步开发高含水老油田、提高采收率的有效手段。针对二氧化碳与原油黏度差较大引起的气窜问题,制备了一种可应用于驱油的超临界二氧化碳增稠剂P-1。通过正交实验分析,认为引发剂用量对反应分子量分布影响最大,合成最优单体摩尔比为4:1:1,此时分子量分布1.12,产率88%。对最优条件下合成的产物进行红外表征,特征吸收峰与产物符合。评价结果表明,P-1在超临界二氧化碳中饱和溶解度为2.30%,最小混相压力7.77Mpa;单体浓度0.2%的增稠剂在30Mpa、50℃下实现对超临界二氧化碳有效提黏42倍,黏度为1.1675mPa.s,升温至110℃,黏度保持率46.41%。模拟地层环境(15MPa),引入质量浓度0.2%的增稠剂P-1能有效改善超临界二氧化碳驱驱油效果,渗透率越低提采效果越显著。同一岩心,超临界二氧化碳驱比水驱后超临界二氧化碳驱的总采出程度高10%以上。图3表2参6

    Abstract:

    carbon dioxide flooding (CO2) is an effective means to further develop old oilfields with high water cuts and improve oil recovery based on tertiary oil recovery. Aiming at the gas channeling problem caused by the large viscosity difference between carbon dioxide and crude oil, a supercritical carbon dioxide thickener agent P-1 that can be applied to oil flooding was prepared. Through orthogonal experimental analysis, it is concluded that the amount of initiator has the greatest influence on the molecular weight distribution of the reaction, the optimal molar ratio of the synthetic monomer is 4:1:1, the molecular weight distribution is 1.12, and the yield is 88%. The synthesized product under optimal conditions was characterized by infrared characterization, and the characteristic absorption peaks matched the product. The evaluation results show that the saturation solubility of P-1 in supercritical carbon dioxide is 2.30%, and the minimum miscible pressure is 7.77Mpa.The thickener with a monomer concentration of 0.2% increased the viscosity of supercritical carbon dioxide by 42 times at 30Mpa, 50℃, the viscosity was 1.1675mPa.s, and the viscosity retention rate was 46.41%, while the temperature was raised to 110℃. Simulating the formation environment (15MPa), adding the thickening agent P-1 with a mass concentration of 0.2% can effectively improve the oil displacement effect of supercritical carbon dioxide flooding, and the lower the permeability, the more significant the extraction effect. In the same core, the total recovery degree of supercritical carbon dioxide flooding is more than 10% higher than that of supercritical carbon dioxide flooding after water flooding.

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  • 收稿日期: 2023-01-26
  • 最后修改日期: 2023-02-16
  • 录用日期: 2023-02-24
  • 在线发布日期: 2023-05-29
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