Petroleum Science >2012, Issue 4: 551-557 DOI: https://doi.org/10.1007/s12182-012-0242-5
Study of asphaltene dispersion and removalfor high-asphaltene oil wells Open Access
文章信息
China University of Petroleum, Beijing 102249, China 2 Key Laboratory of Shale Gas Exploration, Ministry of Land and Resources, Chongqing Institute of Geology and Mineral Resources, Chongqing 400042, China;1 China University of Petroleum, Beijing 102249, China;1 China University of Petroleum, Beijing 102249, China 3 Northwest Oilfield Branch Engineering and Technology Institute of Sinopec, Urumchi 830011, China;CNPC Research Institute of Safety & Environment Technology, Beijing 102206, China;1 China University of Petroleum, Beijing 102249, China;1 China University of Petroleum, Beijing 102249, China
文章摘要
oilfield development process. In this paper, methods such as elemental analysis, and solvent extraction
are adopted for the study of wellbore blockages. The content of organic matter in blockages is higher
than 96% and asphaltene is the main component of the organic matter with n-heptane asphaltene content
of 38%. Based on the above analyses, an agent for asphaltene dispersion and removal (named as SDJ)
was developed. The performance of the SDJ agent was evaluated, and it was found that the dissolution
rate of asphaltene can reach 2.9 mg·mL-1·min-1 at 60 oC. SDJ agent (1wt%) was added to crude oil with a
colloid instability index greater than 0.9 can effectively inhibit asphaltene deposition in the wellbore. By
the viscosity method, the dissolution amount of SDJ agent was calculated, and it was found that when the
viscosity of the system is around 2,000 mPa·s (the common viscosity of crude oil), the amount of SDJ
agent added to the blockage was at least 96 g per 100 g blockages. Therefore, SDJ agent has promising
application for dispersion and removal of asphaltene deposition in high-asphaltene wells.
关键词
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Asphaltenes, asphalthene dispersion and removal, blockages, oil well, evaluation