Method and apparatus to measure the rate of advance of a drilling tool on a floating drilling installation
US4138886A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 1977 |
| Grant date | Feb 13, 1979 |
| Priority date | — |
| Expiry date | Jul 26, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/50
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The disclosure relates to measurement of the rate of advance of a drill bit from a floating drilling installation. The process includes joining a point of the drilling system, fixed in translation with the movement of the drill string, at the lower extremity of which is a drill bit, to a fixed point solid with the ground, by a cable of constant length passing through a pulley system fixed to the floating drilling installation, to measure the angular displacements of different pulleys of the pulley system and to derive from them magnitudes representing the rate of advance of the drill bit. This procedure, applied to a floating drilling system, eliminates the effect of vertical movements, that is swells or waves, from the measurements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.