Aqueous drilling fluids containing fluid loss additives

Details Aqueous drilling fluids containing fluid loss additives Aqueous drilling fluids containing fluid loss additives

1985-11-12

1987-03-03

Guynn, Herbert B.

Compositions

Leather or fur treating

252 8513, C09K 702

Patent

active

046473840

ABSTRACT:
Copolymers of (1) from about 80% to about 98% by weight of acrylic acid and (2) from about 2% to about 20% by weight of itaconic acid and having a weight average molecular weight of between about 50,000 to about 1,000,000, preferably between about 100,000 to about 500,000, and which are at least water dispersible, are used as fluid loss control additives for aqueous drilling fluids and are particularly advantageous when used with muds containing soluble calcium and muds containing chloride ions such as seawater muds. An example is a copolymer of 95% by weight acrylic acid and 5% by weight itaconic acid in its sodium salt form.

REFERENCES:
patent: 2552775 (1951-05-01), Fischer et al.
patent: 2718497 (1955-09-01), Oldham et al.
patent: 4299710 (1981-11-01), Dupre et al.
patent: 4561986 (1985-12-01), Villa et al.
CA 52:20981h (1958).
CA 87:25579e (1977).
CA 93:120386x (1980).

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