Speed correction using cable tension
US6618675B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 20, 2002 |
| Grant date | Sep 9, 2003 |
| Priority date | — |
| Expiry date | Feb 20, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V11/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A well logging system is disclosed having an improved speed correction apparatus and method. One embodiment comprises a logging sonde, a wireline cable, a distance sensor, a tension sensor, and a surface computer. The logging sonde moves through a wellbore while making logging measurements of the formation around the wellbore. The sonde includes an accelerometer to measure acceleration of the logging sonde. As the wireline cable is reeled in on the surface, the distance sensor detects the length of wireline cable that is retrieved. The tension sensor measures the tension in the wireline cable. The surface computer receives measurements from the accelerometer, the distance sensor, and the tension sensor, and determines intervals in which the logging tool is stuck. At least in part, this is done by finding “slow” intervals in which the wireline cable is stretching at about the same rate that the wireline cable is being reeled in.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.