Compositions – Leather or fur treating
Patent
1983-05-27
1986-04-01
Morris, Theodore
Compositions
Leather or fur treating
175 72, 166294, C09K 700, E21B 718
Patent
active
045796688
ABSTRACT:
Well servicing agents and processes for use with fluids circulated into wells penetrating subterranean formations in the earth's crust. Circulation losses of well servicing fluids including drilling muds, workover and completion fluids, and the like, are alleviated by incorporating a particulate material into the servicing liquid. The particulate material is formed of a thermoplastic polymer in a flexible, elongated laminar form in which its length is substantially greater than its width and its width substantially greater than its thickness. A second particulate material in a rigid granular form may be employed an admixture with the laminar particulate material. A particular lost circulation agent is a blend of a particulate thermoplastic polymer in a flexible, elongated form and a particulate thermoset polymer in a rigid granular form with the ratio of the laminar material to the granular material being at least 1:6.
REFERENCES:
patent: 2793995 (1957-05-01), Twining
patent: 2894906 (1959-07-01), Sheeler
patent: 2912380 (1959-11-01), Deane
patent: 3375888 (1968-04-01), Lummus
patent: 3433740 (1969-03-01), Armentrout
patent: 3629102 (1971-12-01), Lummus
patent: 3979305 (1976-09-01), Fisher et al.
"Some Affects of Size Distribut on Particle Bridging in Lost Circulation Filtration Test" Gatlin et al.--Journal of Petroleum Tech. pp. 576-578.
Messenge J. U. "Lost Circulation" Pennwall Pub. Co. Tulsa, Okla. 1981 pp. 23-38 & 97-99.
Morris Theodore
The Western Company of North America
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