Journal
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
Volume 103, Issue -, Pages 36-40Publisher
ELSEVIER
DOI: 10.1016/j.petrol.2013.02.008
Keywords
Drilling fluid; Pore pressure transmission; Membrane efficiency; Shale stability
Categories
Funding
- NSF of China [41072094]
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A novel aluminum-based shale stabilizer used in drilling fluid composed of humic acid and aluminum (HA-Al) was synthesized. HA-Al is soluble under alkaline conditions, however, it can precipitate as microsphere pseudoboehmite and humic acid floc under neutral and acidic conditions or after the addition of Ca2+ and Mg2+ ions in solution. Due to these chemical features, HA-Al can dissolve in drilling fluid and precipitate in the shale pore throats when exposed to shale pore fluid to reduce pore pressure transmission, as is proven by SEM test. Comparing to other two samples of sodium silicate and poly alcohol, HA-Al is the best one to maintain wellbore stability due to its better properties of decreasing pore pressure transmission and increasing actual osmotic pressure of shale sample, as is indicated by pore pressure transmission and shale membrane efficiency tests. (C) 2013 Published by Elsevier B.V.
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