Straight hole driller

Patent · Tue Aug 25 00:00:00 EDT 1981

OSTI ID:6120962

Samford, T L

For use in a drilling string, the preferred and illustrated embodiment depicts a drill collar to be placed in the lower parts of the drill string for straightening the hole. The preferred embodiment utilizes a generally square drill collar with a thick or heavy wall. It is square in cross section along the greater portion of its length, the four corners being slightly rounded to a specified diameter on rotation, and the four lengthwise corners of the regular cross section are all reinforced with hardfacing material to a specified depth, typically tungsten carbide. The four edges abrade the bore hole as the drill string penetrates the earth. In addition, the lower end of the tubular body includes lengthwise flutes in the form known on a stabilizer to guide the hole straightening device into the hole to be reamed by operation of the device.

• Assignee: IFI; EDB-82-003809
• Patent Number(s): US 4285407
• OSTI ID: 6120962
• Resource Relation: Patent File Date: Filed date 17 Dec 1979
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
02 PETROLEUM
DRILLS
DESIGN
OIL WELLS
WELL DRILLING
BOREHOLES
CYLINDRICAL CONFIGURATION
FINS
TUNGSTEN CARBIDES
CARBIDES
CARBON COMPOUNDS
CAVITIES
CONFIGURATION
DRILLING
DRILLING EQUIPMENT
EQUIPMENT
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN COMPOUNDS
WELLS
420206* - Engineering- Mining & Drilling Equipment & Facilities- (1980-1989)
020300 - Petroleum- Drilling & Production