Downhole PV tests for bubble point pressure
US7346460B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 21, 2004 |
| Grant date | Mar 18, 2008 |
| Priority date | — |
| Expiry date | Nov 27, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2013/0266
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention provides an objective bubble point pressure determination method enables new applications of downhole PV (Pressure Volume) test results such as in situ measurement of the bubble point pressure for use as a quality control parameter for sampling. The present invention provides a method and apparatus to fit data points to a curve and to smooth these points over an interval of N points. The derivative of the curve is determined to obtain peak acceleration. The peak acceleration represents the bubble point pressure. This bubble point pressure is verified by comparison to changes in fluid compressibility and visual observation of a pressure volume plot history.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.