Combination core bit

Patent · Tue Mar 23 04:00:00 EST 1965

OSTI ID:6695439

Morlan, E A

This is a combination of a diamond-core bit and a rolling cone-core bit. It can cut a smooth core with minimum breakage and of larger radius than prior rolling- cone bits. It is also less expensive than prior diamond bits and is not subject to breakage with heavy weights or in drilling broken formations. The bit has a diamond crown of relatively small annular thickness and a set of rolling-cone cutters placed outside the crown and partially supported by the crown. The diamond crown cuts a small annulus immediately adjacent the core while the rolling- cone cutters cut the larger fraction of bottom and maintain gage at the sidewall. (5 claims)

• Assignee: Hughes Tool Co.
• Patent Number(s): US 3174564
• OSTI ID: 6695439
• Country of Publication: United States
• Language: English

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