Straight hole drilling method and assembly
US4874045A · kind A · utility
Inventor
Key dates
| Filing date | Dec 27, 1988 |
| Grant date | Oct 17, 1989 |
| Priority date | — |
| Expiry date | Dec 27, 2008 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/22
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A drilling assembly comprises a matched bit and stabilizer in which the maximum outer diameter of the bit and stabilizer have been measured and machined to be within predetermined tolerances. The maximum stabilizer diameter is in the range of 0.003-0.025 inches in diameter less than the measured bit O.D. Preferably, the maximum stabilizer diameter is in the range of 0.005-0.010 inches in diameter less than the measured bit O.D. A series of stabilizer assemblies are provided, including a single stabilizer assembly, a double stabilizer assembly, a hole straightening assembly, a large bit O.D. drilling assembly and a small bit O.D. drilling assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.