Fluid controlled adjustable down-hole tool
US6708785B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Nov 21, 2001 |
| Grant date | Mar 23, 2004 |
| Priority date | — |
| Expiry date | Nov 21, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B23/006
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An adjustable down-hole tool, for example a drill-string stabiliser (10), comprises a body (12) having a through bore (16). A mandrel (18) is rotationally fixed but axially movable in the body, the mandrel being movable by fluid pressure in the tool against the action of a first return spring (44) between a first, activated position and a second deactivated position. A sleeve (66) is between shoulders (68, 69) on the body and mandrel. Castellations (18a,b, 69a,b) are on the mandrel and facing edge or edges of the sleeve so that, when the castellations are in phase the mandrel is prevented from travelling from said first to second position and when they are out of phase they interdigitate and the mandrel is not prevented from travelling from said first to second position. A control piston (36) is slidable in the mandrel, being movable by fluid pressure in the tool against the action of a second return spring (50). The piston is axially slidable with respect to said sleeve and rotationally fixed with respect thereto. A circumferential barrel cam (56) is defined on the piston, a cam follower (58) being disposed in the mandrel but within the confines of the barrel cam so that axial mov…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.