Method and apparatus for reducing the vibration and whirling of drill bits and the bottom hole assembly in drilling used to drill oil and gas wells
US5560439A · kind A · utility
Inventors
Key dates
| Filing date | Apr 17, 1995 |
| Grant date | Oct 1, 1996 |
| Priority date | — |
| Expiry date | Apr 17, 2015 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/1014
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A pair of stabilizers are placed in a string of drill pipe having a drill bit or a coring bit at its lower end, the placement of the stabilizers being such that the distance (d1) between the midpoint (mean transverse section) of the gauge surface of the bit and the midpoint (mean transverse section) of such first stabilizer bears a relationship to the distance (d2) between the midpoints of the two stabilizers. The ratio of d1 to d2 (d1/d2) should be between 1/1.5 to 1/5, and preferably between 1/2 and 1/3, with d1 being maintained less than five feet, preferably less than three feet. In one embodiment, the drill bit and the two stabilizers are formed in a monoblock.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.