Compositions – Leather or fur treating
Patent
1978-03-07
1980-03-11
Guynn, Herbert B.
Compositions
Leather or fur treating
166283, 252 85C, 252 855R, C09K 702, E21B 4325
Patent
active
041927532
ABSTRACT:
A non-damaging variable-density low fluid loss well completion and workover fluid composition which is a dispersion of finely divided slowly oil-soluble, water-insoluble solid particulate matter in a thickened aqueous salt solution. The fluid composition is a mixture of an aqueous solution of a water-soluble inorganic salt, a first high softening point resin fluid loss control additive, a microemulsion fluid loss control additive, and, optionally, a water-dispersible thickening agent and/or a pH control agent. The microemulsion contains water, an oil-soluble surface active agent, a water-dispersible surface active agent, and, as a fluid loss control additive, a mixture of a wax and a second low softening point resin. The microemulsion also optionally contains an additive to prevent phase separation and/or a bactericide. Also disclosed is a method for using this composition in various well drilling, completion and treating operations.
REFERENCES:
patent: 3302719 (1967-02-01), Fischer
patent: 3870668 (1975-03-01), Fischer et al.
patent: 3882029 (1975-05-01), Fischer et al.
patent: 3898167 (1975-08-01), Crowe
patent: 3954629 (1976-05-01), Scheffel et al.
patent: 3979304 (1976-09-01), Fischer et al.
Fischer Paul W.
Gallus Julius P.
Pye David S.
Floyd Gerald L.
Guynn Herbert B.
Sandford Dean
Union Oil Company of California
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