Downhole tool
US6289596A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 2, 1998 |
| Grant date | Sep 18, 2001 |
| Priority date | — |
| Expiry date | Dec 2, 2018 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/0236
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A mounting arrangement for a pendulum in a downhole drift indicator comprises a plunger and a pendulum defining respective normally spaced apart first and second surfaces, and a pivot connection between the plunger and pendulum including a connecting pivot member. On the pivot connection being subject to a predetermined load the first and second surfaces engage to limit the load experienced by the pivot member. Also disclosed is a drift Indicator biassing arrangement, the arrangement including a housing partially defining a volume for containing a fluid reservoir, a signalling plunger and floating piston defining respective wall portions of the volume and being moveable relative to the housing. A spring acts on the piston to compress the fluid in the volume and move the signalling plunger relative to the housing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.