Variable wear pad for crossflow drag bit
US4253533A · kind A · utility
118Cited by
6References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 5, 1979 |
| Grant date | Mar 3, 1981 |
| Priority date | — |
| Expiry date | Nov 5, 1999 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B12/04
- 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 one or more wear pads adjacent the multiplicity of diamond insert cutter blanks, the wear pads serving to channel the flow of drilling mud emanating from fluid passages formed in the face of the bit. The wear pads seal off a portion of the borehole bottom thereby directing hydraulic fluid across the face and over each of the strategically positioned diamond cutter blanks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.