Stabilizer-reamer for drilling an oil well
US5788000A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 1996 |
| Grant date | Aug 4, 1998 |
| Priority date | — |
| Expiry date | Oct 30, 2016 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/003
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The subject of the present invention is a stabilizer-reamer for drilling an oil well. The invention provides an improvement to drillpipe string stabilizers used when drilling an oil well. The purpose of the stabilizer, which forms the subject of the invention, is to allow the drillpipe string to be raised through fractured formations, in addition to its normal function of stabilizing the drillpipes. To this end, it is fitted with retractable abrasive blades which make it possible to re-drill the fractured formations when the drillpipes are being raised and to avoid jamming in the well. The main claims relate to the novel function of the stabilizer, to the geometry of its elements and to the mechanism of opening the blades.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.