Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1985-03-28
1986-07-22
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
5253276, 525378, 525379, 526372, 252 85A, 525369, C08F 832
Patent
active
046020675
ABSTRACT:
An aqueous drilling fluid suitable for high-temperature use comprising a water base, clay suspended in said base and from about 0.01-25 pounds per barrel total composition of a hydrolyzed terpolymer of maleic anhydride, styrene and a third monomer selected from acrylamide, methacrylamide, acrylic acid or methacrylic acid, the molar ratio of maleic anhydride to styrene to said third monomer being from about 30:10:60 to 50:40:10, and the alkali metal, ammonium and lower aliphatic amine salts thereof, the weight-average molecular weight of said hydrolyzed terpolymer being from about 500-10,000. An improved drilling process wherein such fluids remain flowable at elevated temperatures is also disclosed.
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Stong Randel E.
Walinsky Stanley W.
Knuth Charles J.
Lipman Bernard
Monroe James H.
Pfizer Inc.
Richardson Peter C.
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