Making directional measurements using a rotating and non-rotating drilling apparatus
US7848887B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 2007 |
| Grant date | Dec 7, 2010 |
| Priority date | — |
| Expiry date | Mar 1, 2027 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/024
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A system and method to determine directional measurements for a drilling tool that at times rotates and at other times does not rotate. The method includes making a first set of measurements when the apparatus is rotating, making a second set of measurements when the apparatus is not rotating, and combining the first and second sets of measurements to obtain the directional measurements. The system includes a transmitter-receiver pair wherein the transmitter has a magnetic dipole moment parallel to a longitudinal axis of the apparatus and the receiver has a magnetic dipole moment that is tilted relative to the longitudinal axis of the apparatus, an electronics module to excite the transmitter and detect a receiver signal to make a first and second set of measurements when the apparatus is rotating and not rotating, and a processor to combine the first and second sets of measurements to obtain the directional measurements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.