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:
Jun. 08, 2004
Filed:
Sep. 19, 2002
Applicant:
Inventor:
Jon G. Gjedebo, Stavanger, NO;
Assignee:
National Oilwell Norway AS, Stavanger, NO;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B 2/114 ; E21B 7/12 ;
U.S. Cl.
CPC ...
E21B 2/114 ; E21B 7/12 ;
Abstract
A method of drilling sub-sea oil and gas production wells in which a liquid hydrocarbon substance, such as a natural gas liquid, is injected into the drilling mud supplied to the well in order to reduce the mud density. The method of the present invention enables reduction and control of the hydraulic pressure of the drilling mud while drilling production wells in deep water, thereby to require fewer casing runs which eventually yields better oil productivity.