On studies of formation, diffusion mechanisms and prevention measures of CO during HEGF in low permeability oil reservoirs
High energy gas fracture (HEGF) has been one of central measures used to increase production and effusion in low permeability reservoirs. But there are some problems of this technology. One of them is that large number of toxic and harmful gases caused by it will trigger severe CO poisoning events. In this paper, the formation-gathering rule and countermeasures of CO for HFGF were studied across-the-board in low permeability reservoirs. The study showed that the primary reasons to produce CO are HEGF itself and that high temperature gases for HEGF reacted with associated gas and oil. At the same time, the formation mechanism of CO was illuminated. The study was of great theoretical value to prevent CO in effect for low permeability reservoirs, and was of great guiding significance for the rational development of similar oilfields.
Key WordsHigh energy gas fracture CO formation mechanisms prevention measures
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- Jing-bao Jiang, et al. On the Study and Development for the stimulation technology [J]. Drilling & Production Art, 2005, 28(5): 50–53.Google Scholar
- Ji-yun Jin. Practical Handbook for Toxic Theory [M]. Beijing: China Environmental Science Press, 1991.Google Scholar
- Roberts M P, Fow les M. Review of the Steam Reforming Process and Catalysts [J]. Touch Coal, 1994, 36(4): 270–277.Google Scholar
- Liu Yong-jian, et al. On the studies of the Chemical Reactions of heavy oils under steam stimulation condition [J]. Daqing Petroleum Institute, 2002, 26(3): 95–98.Google Scholar
- Din Xin-wei, et al. On the Study of Toxic Gas Diffusion [J]. Chemical Engineering, 2000, 28(1): 33–36.Google Scholar
- Ansari A M, Sylvester N D, et al. Supplement to Paper SPE 20630, A Comprehensive Mechanistic Model for Upward Two-Phase Flow in a Wellbore [J]. SPE 28671 Available at SPE Headquarters, Richardson.Google Scholar