Diamond studded insert drag bit with strategically located hydraulic passages for mud motors
US4246977A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 9, 1979 |
| Grant date | Jan 27, 1981 |
| Priority date | — |
| Expiry date | Apr 9, 1999 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/60
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A diamond studded insert drag bit is disclosed having a multiplicity of individual diamond insert cutter blanks inserted in the face of the bit. The diamond insert blanks are so positioned to maximize penetration of the bit in a borehole. The bit further includes fluid passages strategically located in the bit face to provide uniform flow, cooling and continuous cleaning of each of the diamond cutter insert blanks. The fluid passages are so sized to cause minimum bit pressure drop. Bits with minimum pressure losses from fluid flow are best suited for positive displacement mud motors that cannot tolerate downstream pressures in excess of 50 to 500 pounds per square inch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.