Measuring micro stalls and stick slips in mud motors using fiber optic sensors
US10364668B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 2014 |
| Grant date | Jul 30, 2019 |
| Priority date | — |
| Expiry date | Jul 11, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/35364
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A fiber optic sensor is disposed in the elastomer of the stator of the mud motor in order to sense elastomer strain while drilling. The frequencies of micro stalls and stick slips are measured from the fiber optic sensor data by classification using thresholds or by converting time-domain measurements from the fiber optic sensor data to frequencies. For example, the frequencies are produced by accumulating a histogram over an interval of time or by computing a Discrete Fourier Transform over an interval of time. A plurality of fiber optic sensors also can sense angular position of the rotor of the mud motor for correlation of the micro stalls and stick slips with the angular position. The measurements of the micro stalls and stick slips are used to select remedial action such as changes in drilling parameters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.