High temperature environmentally benign drilling fluid, and viscosifying additives for use therewith
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United States of America Patent
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Nov 17, 1998
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N/A
app pub date -
May 6, 1997
filing date -
May 6, 1997
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Expired
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Abstract
An oil base environmentally benign drilling fluid composition having a stable high viscosity and high gel strength at use temperatures of up to at least 450.degree. F. The drilling fluid includes a low toxicity biodegradable oil vehicle, and as a viscosifying agent an organoclay which is the reaction product of a mineral clay mixture and an alkyl quaternary ammonium salt. The mineral clay mixture comprises at least 50% by weight of a mineral clay selected from the group consisting of sepiolite, palygorskite and mixtures of sepiolite and palygorskite; and substantially the balance of the mixture is a smectite. Conventional additives such as emulsifiers and fillers may also be present in the drilling fluid.
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