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:
Apr. 02, 2002
Filed:
Apr. 06, 2001
Applicant:
Inventors:
Egil Sunde, Sandnes, NO;
Håvard Olsen, Hundvåg, NO;
Assignee:
Statoil Asa, Stavanger, NO;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C02F 1/00 ;
U.S. Cl.
CPC ...
C02F 1/00 ;
Abstract
A method for removing hydrogen sulfide in drilling mud comprises adding to the drilling mud which is circulated in a borehole a relatively sparingly soluble divalent iron salt having a solubility from 0.1 to 1000 ppm at room temperature in the drilling mud, whereby the hydrogen sulfide reacts with the divalent iron salt to form iron sulfide.