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| 利用超临界CO2解除地层石蜡堵塞实验研究 |
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孙雪1, 倪红坚1, 王学迎1, 王瑞和1, 于占淼2, 周通3
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(1.中国石油大学非常规油气与新能源研究院,山东青岛 266580;2.中石化中原石油工程有限公司钻井二公司,河南濮阳 457001;3.南京汽轮电机(集团)有限责任公司,江苏南京 210000)
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| 摘要: |
| 采用室内模拟实验装置研究超临界CO2解除地层石蜡堵塞的可行性,并分析超临界CO2解堵石蜡的作用机制及驱替参数对解堵效果的影响规律。结果表明:超临界态CO2对石蜡具有溶胀和冲刷双重作用,其解堵效果远好于气态和液态CO2;随着驱替时间延长,解堵效果逐渐变好,超过一定时间后,岩心渗透率不再增加;解堵效果随着温度和驱替速度的增大而变好;随着压力的升高,解堵效果先增强后减弱,存在一个最佳解堵压力。 |
| 关键词: 超临界CO2 地层石蜡堵塞 解堵 溶胀 影响因素 |
| DOI：10.3969/j.issn.1673-5005.2016.03.014 |
| 分类号::TE 357 |
| 基金项目:国家“973”重点基础研究发展计划(2014CB239202);中央高校基本科研业务费专项(27R1402019A);教育部博士点基金项目(20120133110011,6) |
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| Experimental study on removing formation paraffin deposits using super-critical carbon dioxide |
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SUN Xue1, NI Hongjian1, WANG Xueying1, WANG Ruihe1, YU Zhanmiao2, ZHOU Tong3
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(1.Research Institute of Unconventional Oil & Gas and New Energy, China University of Petroleum, Qingdao 266580, China;2.The No.2 Drilling Company of Zhongyuan Oilfield Service Corporation, SINOPEC, Puyang 457001, China;3.Nanjing Turbine Motor (Group) Company Limited, Nanjing 210000, China)
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| Abstract: |
| The feasibility of removing formation paraffin deposits by super-critical carbon dioxide was studied through indoor simulation test apparatus. The mechanism of super-critical carbon dioxide removing paraffin deposits and the influence of flooding parameters were analyzed. Experimental results show that the plug removing performance of super-critical carbon dioxide is much better than gaseous and liquid carbon dioxide due to the combined effects of swelling and flooding of super-critical carbon dioxide on the paraffin. The plug removal effect becomes better with the displacement time increase. And the permeability of cores would not increase after several hours. The plug removing effect becomes better as the temperature and flow rate increases. As the flooding pressure rises, the plug removing effect increases firstly then decreases and there is an optimum pressure for removing paraffin plugging by super-critical carbon dioxide. |
| Key words: super-critical carbon dioxide formation paraffin deposit plug removing swelling influence factors |
