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:
Oct. 11, 1988
Filed:
Jun. 15, 1987
Applicant:
Inventor:
Alan S Baker, Berkshire, GB;
Assignee:
Imperial Chemical Industries PLC, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09K / ;
U.S. Cl.
CPC ...
252-8515 ; 252-8511 ;
Abstract
Drilling fluid compositions of the invert oil-based type incorporate (i) as the agent for emulsifying the brine phase in the oil phase, a block or graft copolymer of the general formula (A-COO).sub.m B, where A and B represent polymeric components derived from a specified type of oil-soluble complex monocarboxylic acid and from a water-soluble polyalkylene glycol or polyether polyol, respectively, and m is an integer at least 2, and (ii) as the agent for dispersing solid particulate matter in the oil phase a surfactant containing a C.sub.30-500 hydrocarbon chain as hydrophobic component, and a polar component adsorbable on to the particulate solid surface.