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:
Mar. 11, 1980
Filed:
Feb. 21, 1978
Applicant:
Inventors:
Assignee:
Societe Nationale Elf Aquitaine (Production), Paris, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09K / ; E21B / ; E21B / ;
U.S. Cl.
CPC ...
175 66 ; 175206 ;
Abstract
Recovery of drilling fluid from the mud leaving the well. The mud is first subjected to conventional separation on screens, settling tanks and/or hydrocyclones, whereafter the resulting liquid is centrifuged. The centripetal effluent of the centrifuge is recycled, alone of in mixture with non-centrifuged liquid, to the drilling tool. The process is applicable to drilling on land and at sea, saves drilling additives, avoids the need for the maintenance of mud tips, transportation of spent mud and avoids pollution.