Inertial borehole survey system
US4454756A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 18, 1982 |
| Grant date | Jun 19, 1984 |
| Priority date | — |
| Expiry date | Nov 18, 2002 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/022
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A system and method for surveying, with accuracies better than one foot per thousand feet of depth, very deep boreholes having the attendant small diameters, high temperatures and high pressures with very high accuracy. A downhole probe is used having a small diameter, less than about four inches. Three linear type accelerometers and at least two gyros to provide three sensitive axes are fixedly mounted at points spaced along the axis of an elongated, rigid, thermally conductive support member to form an instrument cluster. Signals from these instruments are then processed and transmitted serially over a conductor of a conventional wireline to the surface unit where a surface computer continuously computes and records the current position of the instrument.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.