DISPERSANT AND A DRILLING FLUID CONTAINING THE SAME
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United States of America Patent
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Issued Date -
Mar 28, 2013
app pub date -
Sep 26, 2012
filing date -
Sep 28, 2011
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Abandoned
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Abstract
The present invention provides a dispersant and a drilling fluid containing the dispersant. The dispersant comprises the product obtained from the reaction of water, lignin, phenol, sulfonating agent, telogen and catalyst at 140-220° C., preferably at 160-180° C.; the catalyst is one or more selected from the group consisting of sulfamic acid, p-toluenesulfonic acid and benzenesulfonic acid. The dispersant provided by the present invention not only can significantly lower the viscosity of the drilling fluid but also plays a role in reducing filtration loss.
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