The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 01, 1988
Filed:
Apr. 13, 1987
Applicant:
Inventors:
Assignee:
Coatex, S.A., Caluire, FR;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08F / ; C08F / ;
U.S. Cl.
CPC ...
5253266 ; 525369 ; 525379 ; 525380 ; 525381 ; 5253302 ; 525382 ; 526277 ;
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: