Downhole real-time filtrate contamination monitoring
US10316656B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 27, 2015 |
| Grant date | Jun 11, 2019 |
| Priority date | — |
| Expiry date | Aug 11, 2036 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B49/0875
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method includes identifying linearly behaving data within obtained data associated with fluid obtained from a subterranean formation. Shrinkage factor is determined based on the linearly behaving data. A function relating GOR data of the obtained fluid with the determined shrinkage factor is determined. A first linear relationship between optical density (OD) data of the obtained fluid and the function is determined. A second linear relationship between density data of the obtained fluid and the function is determined. An oil-based mud (OBM) filtrate contamination property of OBM filtrate within the obtained fluid based on the first linear relationship is determined. A native formation property of native formation fluid within the obtained fluid based on the second linear relationship is determined. A volume fraction of OBM filtrate contamination within the obtained fluid based on the OBM filtrate contamination property and the native formation property is estimated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.