Study on enhancing heavy oil recovery mechanism of antiscaling alkali

GAO Chao; SUN Binghua; SUN Jianbo; CAO Cheng; WANG Yongfei; YAN Xiong

doi:10.3969/j.issn.1673-8926.2014.03.021

Lithologic Reservoirs >

2014 , Vol. 26 >Issue 3: 125 - 130

DOI: https://doi.org/10.3969/j.issn.1673-8926.2014.03.021

Study on enhancing heavy oil recovery mechanism of antiscaling alkali

GAO Chao ,
SUN Binghua ,
SUN Jianbo ,
CAO Cheng ,
WANG Yongfei ,
YAN Xiong

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1. Zhanjiang Branch of CNOOC Ltd.， Zhanjiang 524057， Guangdong， China； 2. College of Petroleum Engineering， China University of Petroleum， Qingdao 266580， Shandong， China

Online published: 2014-06-06

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Abstract

The content of calcium and magnesium ions in the formation water in Xiaba block is relatively high, so scaling problem will occur when use conventional alkali agent such as sodium hydroxide and sodium carbonate. This paper investigated the alkaline which has antiscaling effect, and chose NaBO2 which has strong chelating capacity for calcium and magnesium ions to do indoor research and used sandpacks to evaluate its displacement efficiency. The results show that although the dynamic interfacial tension is high, the displacement efficiency during the sandpacks tests is good. During the displacement process, a large differential pressure response appeared when the alkali concentration is high, and the incremental oil recovery increased with the increase of alkali concentration. Microscopic mechanism shows that the alkaline solution penetrates into the crude oil to form water drops inside the oil phase, and those water drops turn into W/O emulsions subsequently, which could block the water channel and inhibit the viscous fingering, leading to the improvement of sweep efficiency.

Key words： ; low permeability； diagenesis； heterogeneity； Ordos Basin

Cite this article

GAO Chao , SUN Binghua , SUN Jianbo , CAO Cheng , WANG Yongfei , YAN Xiong . Study on enhancing heavy oil recovery mechanism of antiscaling alkali[J]. Lithologic Reservoirs, 2014 , 26(3) : 125 -130 . DOI: 10.3969/j.issn.1673-8926.2014.03.021

References

［1］ Wang J，Dong M. A laboratory study of polymer flooding for improving heavy oil recovery［C］. Petroleum Society’s 8th Canadian International Petroleum Conference，Calgary，Albert，2007：178.
［2］ Selby R，Alikhan A A，Farouq Ali S M. Potential of non-thermal methods for heavy oil recovery［J］. Journal of Canadian Petroleum Technology，1989，28（4）：45- 59.
［3］车洪昌，任耀宇，刘汉平，等．龙虎泡油田活性水驱油室内实验研究［J］．岩性油气藏，2011，23（2）：128-132.
［4］ Almalik M S，Attia A M，Jang L K. Effects of alkaline flooding on the recovery of Safaniya crude oil of Saudi Arabia［J］. Journal of Petroleum Science and Engineering，1997，17（3/4）：367-372.
［5］ Turksoy U，Bagci S. Improved oil recovery using alkaline solutions in limestone medium ［J］. Journal of Petroleum Science and Engineering，2000，26（1）：105-119.
［6］窦立荣，侯读杰，程顶胜，等．高酸值原油的成因与分布［J］．石油学报，2007，28（1）：8-13．
［7］ Pei H，Zhang G，Ge J，et al. Potential of alkaline flooding to enhance heavy oil recovery through water-in-oil emulsification［J］. Fuel，2013，104：284-293.
［8］ Arhuoma M，Yang D，Dong M，et al. Determination of increase in pressure drop and oil recovery associated with alkaline flooding for heavy oil reservoirs［C］. Canadian International Petroleum Conference，Calgary，Alberta，2009.
［9］ Jennings H Y，Johnson C E，McAuliffe C D. A caustic waterflooding process for heavy oils ［J］. Journal of Petroleum Technology，1974，26：1344-1352.
［10］ Berger P D，Lee C H. Improved ASP process using organic alkali ［R］. SPE 99581，2006.
［11］ Flaaten A K，Nguyen Q P，Zhang Jieyuan，et al. ASP Chemical flooding without the need for soft water［R］. SPE 116754，2008.
［12］ Zhang Jieyuan，Nguyen Q P，Flaaten A K，et al. Mechanisms of enhanced natural imbibition with novel chemicals［R］. SPE 113453，2009.
［13］李娜.普通稠油超低界面张力驱油体系研究［D］.青岛：中国石油大学（华东），2011.
［14］ Zhang H，Dong M，Zhao S. Which one is more important in chemical flooding for enhanced court heavy oil recovery，lowering interfacial tension or reducing water mobility? ［J］. Energy Fuels，2010，24 (3）：1829-1836.
［15］ Pei H，Zhang G，Ge J，et al. Analysis of microscopic displacement mechanisms of alkaline flooding for enhanced heavy-oil recovery［J］. Energy Fuels，2011，25（10）：4423-4429.

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