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:
Aug. 26, 1986
Filed:
Jan. 09, 1985
Joseph J Dickert, Jr, Yardley, PA (US);
Israel J Heilweil, Princeton, NJ (US);
Mobil Oil Corporation, New York, NY (US);
Abstract
A water-based clay drilling fluid or mud suitable for drilling at temperatures up to 200.degree. C. and pressures up to 100 psig at pH levels from 8 to 11.5, said mud or fluid containing additives which are two separate and distinct water-soluble vinyl sulfonate amide polymers. One polymer consists of a random distribution of units of the formulae ##STR1## The other polymer consists of a random distribution of units of the formula (a) and (b) as described above. In each polymer, R.sub.1 and R.sub.2 are the same or different and each is hydrogen, methyl, or ethyl, and X.sup.+ is a cation. Drilling while using this improved fluid or mud results in a reduced fluid loss rate.