Shale hydration inhibition agent and method of use
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United States of America Patent
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Jun 19, 2001
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app pub date -
Feb 11, 2000
filing date -
Feb 11, 2000
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Abstract
A water-base drilling fluid for use in drilling wells through a formation containing a shale which swells in the presence of water. The drilling fluid preferably includes: an aqueous based continuous phase, a weight material, and a shale hydration inhibition agent having the formula: H.sub.2 N--CH(CH.sub.3)CH.sub.2 {--OCH.sub.2 CH(CH.sub.3)--}.sub.x --NH.sub.2 in which x is a value less than 15. The shale hydration inhibition agent should be present in sufficient concentration to reduce the swelling of the shale. Preferably x has an average number between about 1 and about 5 and more preferably x has an average number of about 2.6. Also inclusive of the present invention is a method of reducing the swelling of shale clay encountered during the drilling of a subterranean well, the method comprising circulating in the well a water-base drilling fluid formulated in accordance with the present invention.
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