Method for measuring with great precision the volume variation occurring when fluid phases mix in order to determine physico-chemical characteristics
US5747673A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Sep 27, 1996 |
| Grant date | May 5, 1998 |
| Priority date | — |
| Expiry date | Sep 27, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F22/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A containment cell with two chambers (7) in a thermostat-controlled enclosure (3) is used to measure separately, at determined pressure levels, the volumes occupied separately by fluid phases, prior to measuring at the same pressures the volume occupied by the mixture thereof, so as to deduce therefrom the excess volume (v.sup.E) and the density of the mixture. By minimizing an error function (F) that takes account of volume quantities, such as the excess volume (v.sup.E) or the density of the mixture, and of phase equilibrium data of the mixture such as the saturation pressures (Psat), these data being determined from said cell, it is possible to determine with precision the coefficients of the equation of state relating the thermodynamic parameters of the mixture (P, V, T) and thereby to fine down for example reservoir models. The method can be applied for study of petroleum fluids for example.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.