Non-polluting thinning adjuvant for sea-water and/or fresh water

Details Non-polluting thinning adjuvant for sea-water and/or fresh water Non-polluting thinning adjuvant for sea-water and/or fresh water

1987-04-13

1988-11-01

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...

525369, 525379, 525380, 525381, 5253302, 525382, 526277, C08F13002, C08F23002

Patent

active

047821205

ABSTRACT:
Non-polluting thinning adjuvant for sea-water and/or fresh-water based drilling muds.
Non-polluting thinning adjuvant for sea-water and/or fresh-water based drilling muds, with the aim to maintain their rheological characteristics in the extreme conditions of temperature and pressure which prevail in wells drilled at great depths. This thinning adjuvant is characterized by the fact that it is a hydrosoluble copolymer resulting from the copolymerization of ethylenic acids, acrylamides and ethylenic esters of phosphoric acid.
Its general formula is: ##STR1## in which the indices m,n,p -expressed in % in mole- are chosen from the following intervals:

REFERENCES:
patent: 4177179 (1979-12-01), Kurihara et al.
patent: 4487859 (1984-12-01), Martino
patent: 4518745 (1985-05-01), Engelhardt
Chem. Abstracts vol. 86, entry 109852, Pons et al., Apr. 7, 1977.
Chem. Abstracts vol. 86, entry 190853, Pons et al., Apr. 7, 1977.

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