Active drill stabilizer assembly
US4241796A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 1979 |
| Grant date | Dec 30, 1980 |
| Priority date | — |
| Expiry date | Nov 15, 1999 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/022
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present disclosure concerns an active drill stabilizer assembly for arrangement in a drill string directly behind a conventional or modified drill bit that utilizes drilling fluid as a sensing and working deviation/correction energy source. In a sensing loop of the present invention, the drilling fluid passes through groups of pitch and yaw sensor outlet ports and orifices that direct the fluid against the bore-hold side wall. The flow through the orifices is proportional to the gaps between the outlet ports and the well bore side wall and grouping of the sensors provides for an "averaging effect" to the fluid flow that ignores local side wall surface irregularities and produces an instantaneous venturi throat pressure for each axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.