期刊
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
卷 32, 期 -, 页码 59-65出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jngse.2016.03.073
关键词
Carbon dioxide; Formation paraffin deposits removal; Adsorption-induced swelling; Experiment
资金
- National Natural Science Funds of China [51504281]
- Major State Basic Research Development Program of China [2014CB239202]
- Fundamental Research Funds for the Central Universities [27R1402019A, 15CX07004A]
- Doctoral Fund of Ministry of Education [20120133110011, 20130133110006]
Formation paraffin deposits cause serious productivity damage during, the process of oil production. As an effective, economical and environmentally friendly organic solvent, CO2 has many advantages in removing formation paraffin deposits. In this paper, the mechanism of action for CO2-mediated removal of formation paraffin deposits is analysed. An indoor simulation of CO2-mediated removal of formation paraffin deposits is conducted. The feasibility of removing formation paraffin deposits by CO2 is investigated and the effect of injection parameters on plug removal efficiency is discussed. The experimental results show that CO2 adsorption-induced swelling and paraffin thermal expansion are the main factors that facilitate CO2-mediated removal of formation paraffin deposits. Plug removal using CO2 requires a long injection time. As the injection temperature increases, plug removal efficiency increases. As the injection pressure increases, plug removal efficiency first increases and then decreases, which allows for determination of the optimal injection pressure. (C) 2016 Elsevier B.V. All rights reserved.
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