Asphalt water-based drilling fluid additive
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United States of America Patent
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Jun 23, 2020
Grant Date -
Mar 8, 2018
app pub date -
Sep 1, 2017
filing date -
Sep 2, 2016
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Abstract
An emulsified drilling fluid additive includes an emulsion of asphalt, at least one emulsifier, cellulose ether, and water. The asphalt has a softening point of 160 to 212° F., a penetration depth of 0 to 45 mm, and a viscosity of 200 to 800 cP at 350° F. The drilling fluid additive has an average particle size of 0.1-10 microns. The drilling fluid has an API fluid loss at 7.5 minutes of 0 to 0.5 mL and an API fluid loss at 30 minutes of 0 to 3.5 mL. A method of making the drilling fluid additive includes mixing at least one emulsifier, cellulose ether, and water to form a solution, heating a water-dispersible asphalt to above 300° F. and adding the asphalt to the water-based solution in a colloid mill to form an emulsion.
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