Method of formation evaluation with cleanup confirmation
US9752432B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 10, 2013 |
| Grant date | Sep 5, 2017 |
| Priority date | — |
| Expiry date | Nov 4, 2035 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B49/0875
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Methods of evaluating a downhole fluid with a downhole tool. The downhole tool is positionable in a wellbore penetrating a subterranean formation, and has a probe positionable adjacent a wall of the wellbore and pumps, the probe having a sampling inlet and a contamination inlet to draw fluid from the formation into the downhole tool with the pumps. The methods involve pumping fluid into the downhole tool through the sampling inlet and the contamination inlet, varying the pumping of the fluid through the sampling inlet and the contamination inlet at a plurality of flow rates, measuring parameters of the fluid passing through the sampling inlet and the contamination inlet (the fluid parameters comprising optical density), and determining cleanup of contamination during sampling by examining changes in optical density of the fluid entering the sampling inlet at the flow rates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.