Drilling and completion muds useful at elevated temperatures

Details Drilling and completion muds useful at elevated temperatures Drilling and completion muds useful at elevated temperatures

1983-03-10

1985-08-20

Guynn, Herbert B.

Compositions

Leather or fur treating

252 85A, 5253294, 525374, 525377, C09K 702

Patent

active

045362963

ABSTRACT:
The invention is clay based water drilling or completion muds with low viscosity and exceptional stability at elevated temperatures of up to 200.degree. C. The muds are characterized by containing from 1 to 10 grams per liter of a low molecular weight polymer or copolymer having functional groups wherein from 2 to 95% of the functional groups consist independently of hydroxamic or thiohydroxamic groups. The mud composition comprises (a) fresh water, water containing electrolytes such as sodium chloride, potassium chloride, calcium chloride, magnesium chloride, or seawater; (b) clay, chosen to suit the saline concentration of the water and to provide the necessary properties; and (c) one or more viscosity increasing materials.

REFERENCES:
patent: 2718497 (1955-09-01), Oldham et al.
patent: 2959574 (1960-11-01), Woodberry
patent: 2979454 (1961-04-01), Fields et al.
patent: 3730900 (1973-05-01), Perricone et al.
patent: 3764530 (1973-10-01), Burland et al.

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