Aqueous clay base mud for deep drilling

Details Aqueous clay base mud for deep drilling Aqueous clay base mud for deep drilling

1975-09-09

1977-09-13

Guynn, Herbert B.

Compositions

Leather or fur treating

260 793M, C09K 702

Patent

active

040480771

ABSTRACT:
An aqueous clay base mud for deep drilling containing as a protective colloid a copolymer which is constituted by the formula I, II and III ##STR1## IN WHICH R.sub.1 and R.sub.2 each is hydrogen of --CH.sub.3 ; R.sub.3 is --CO--NH.sub.2, --CN or COOCH.sub.3 ; R.sub.4 is hydrogen, --CH.sub.3 or --C.sub.2 H.sub.5 ; R.sub.5 is --CH.sub.3 or --C.sub.2 H.sub.5 or R.sub.4 and R.sub.5 together represent a propylene group forming a pyrrolidone radical with the inclusion of the radical ##STR2## Me is ammonium, potassium, sodium or lithium and x is 5 to 50, y 25 to 92 and z 3 to 70,
Or by the saponification products thereof and which contains the components in the parts by weight of the starting monomers indicated by the indices x, y and z.

REFERENCES:
patent: 2718497 (1955-09-01), Oldham et al.
patent: 3025234 (1962-03-01), Canterino
patent: 3629101 (1971-12-01), Hille et al.

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