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:
Jul. 06, 2004
Filed:
Sep. 17, 2002
Applicant:
Inventors:
Egil Sunde, Sandnes, NO;
Terje Torsvik, Bones, NO;
Assignee:
Statoil ASA, Stavanger, NO;
Primary Examiner:
Int. Cl.
CPC ...
E21B 4/322 ;
U.S. Cl.
CPC ...
E21B 4/322 ;
Abstract
A method of microbial enhanced oil recovery for recovering oil from an oil-bearing rock formation ( ). The method comprises: injecting water containing a source of vitamins, phosphates and an electron acceptor such as nitrate into the formation at first location ( ) and allowing anaerobic bacteria, which are either already present in the formation ( ) or which are introduced simultaneously to multiply using the oil as their main carbon source. This establishes a biomass layer ( ) which acts to dissociate the oil from the rock formation ( ). The dissociated oil is removed via an outlet ( ).