Formation fluid flow rate determination method and apparatus for electric wireline formation testing tools
US5587525A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 27, 1995 |
| Grant date | Dec 24, 1996 |
| Priority date | — |
| Expiry date | Apr 27, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/2823
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of determining the volume of a fluid sample withdrawn from an earth formation penetrated by a wellbore is disclosed. The method includes the step of positioning a formation testing tool adjacent to the earth formation. The tool includes a probe which can be selectively placed in hydraulic communication with the formation and excluded from hydraulic communication with the wellbore. The probe can be in hydraulic communication with a pressure transducer. The tool includes a sample chamber selectively placed in hydraulic communication with the probe. The chamber includes means for measuring the volume of the chamber and means for selectively controlling the volume of the chamber. The method further includes the steps of placing the probe in hydraulic communication with the formation, placing the sample chamber in hydraulic communication with the probe and selectively increasing the volume of the chamber while measuring the volume of the chamber and the pressure, determining the volume of the chamber when a fluid from the wellbore disposed within the probe at the start of withdrawal of the sample ceases to expand, by determining an expansion volume at which the pressure decreas…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.