Cement slurries for deep holes, with a copolymer content for reducing the water loss

US4587283A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Martin Hille · Liederbach, DE
• Wolfgang Friede · Ludwigsburg, DE
• Heinz Wittkus · Frankfurt am Main, DE
• Friedrich Engelhardt · Frankfurt, DE
• Ulrich Riegel · Landstuhl, DE

Key dates

• Filing date: Apr 3, 1985
• Grant date: May 6, 1986
• Expiry date: Apr 3, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K8/46
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Cement slurries for deep holes, with a content of copolymers which are composed of 5-95% by weight of groups of the formula ##STR1## in which R.sub.1 is hydrogen or methyl, PA0 R.sub.2 is C.sub.2 -C.sub.10 -alkylene and PA0 Me is ammonium, lithium, sodium or potassium, of 5-60% by weight of groups of the formula ##STR2## in which R.sub.3 is hydrogen, --CH.sub.3 or C.sub.2 H.sub.5 and PA0 R.sub.4 is --CH.sub.3 or C.sub.2 H.sub.5, or PA0 R.sub.3 and R.sub.4 together are a propylene group which, with incorporation of the radical ##STR3## forms a pyrrolidone radical, and of 0-90% by weight of groups of the formula ##STR4## in which R.sub.6 is hydrogen or methyl and PA0 R.sub.7 is carboxamido, carboxyl, cyano or carbomethoxy. These copolymers reduce the water loss of cement slurries which are required for deep holes.