Method of placing magnetic markers on collarless cased wellbores

Patent · Tue Feb 25 00:00:00 EST 1986

OSTI ID:5865986

Wilson, J G; Crawford, G J

This patent describes a method of marking a wellbore casing in a manner such that the mark can be subsequently detected by a casing collar locator comprising placing a horseshoe-shaped electromagnet adjacent to the casing and energizing the electromagnet producing a magnetic marker at a location between the poles of the electromagnet.

• Assignee: Standard Oil Co., (now)Amoco Corp., Chicago, IL
• Patent Number(s): US 4572293
• OSTI ID: 5865986
• Resource Relation: Patent File Date: Filed date 31 Aug 1984
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
OIL WELLS
WELL CASINGS
IDENTIFICATION SYSTEMS
ELECTROMAGNETS
MAGNET POLE PIECES
ELECTRICAL EQUIPMENT
EQUIPMENT
MAGNETS
WELLS
020300* - Petroleum- Drilling & Production