Non-polluting thinning adjuvant for sea-water and/or fresh water based drilling muds
US4782120A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 13, 1987 |
| Grant date | Nov 1, 1988 |
| Priority date | — |
| Expiry date | Apr 13, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/24
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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: EQU 0%<m<90% EQU 2%<n<100% EQU 0%<p<90% and where radicals R.sub.1, R.sub.2 and R.sub.4 are chosen from the group consisting of H and the alkyles, and radical R.sub.3 is chosen from the group consisting of alkylenes and alkylene-oxides and/or polyalkylene oxides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.