C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
31/24
C09K 8/24 (2006.01) C08F 2/06 (2006.01)
Patent
CA 1259182
Abstract of the Disclosure Polymers derived from copolymerization of a hydrophilic vinyl monomer, such as acrylic acid or methacrylic acid, with at least one hydrophobic vinyl monomer, such as an acrylic acid ester, a methacrylic acid ester, a vinyl ester of a saturated monocarboxylic acid having from 1 to 3 carbon atoms, and the like, prepared under polymerization conditions for a period of time sufficient to produce a copolymer having a weight average molecular weight within a predetermined range, perform effectively as water loss additives for drilling fluids under high temperature conditions, e.g., in the range from about 175°F to about 700°F. Such water loss control additives are especially effective when employed in drilling fluids having high solids content. Also disclosed are drilling fluids employing such water loss control additives as well as a method of drilling a borehole in the earth using drilling fluids employing such water loss control additives.
436080
Osler Hoskin & Harcourt Llp
Phillips Petroleum Company
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