Fixed-contact stabilizer
US4662461A · kind A · utility
Inventor
Key dates
| Filing date | Jul 29, 1981 |
| Grant date | May 5, 1987 |
| Priority date | — |
| Expiry date | Jul 29, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/1078
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A drill string stabilizer in which the wall-contacting wear elements or blades are secured in their accommodating pockets by a lateral interference fit. One embodiment includes recess-and-protection connections between end-to-end aligned, individual wear elements, the surfaces of mating parts permitting rotation. Cap screws and locking blocks are also employed in some embodiments. Surfaces of the locking block and the pocket permit its insertion without longitudinal movement. An alternate embodiment not using a plurality of elements or a locking block employs a transverse thrust surface which is slightly angled to permit rotation fitting into the accommodating pocket. The blades are made to assure uniform side pressure within their respective accommodating pockets by slight inward dimension tapering or by longitudinal underneath blade slotting to provide a leg structure that flexes, the tapering or slotting acting in opposition to natural loosening that would occur if a uniformly dimensioned and non-flexible blade were pressed into a uniformly dimensioned pocket.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.