Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Content or effect of a constituent of a liquid mixture
Patent
1996-05-06
1998-05-05
Williams, Hezron E.
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Content or effect of a constituent of a liquid mixture
7315218, G01N 3320
Patent
active
057476748
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a device for measuring thermodynamic properties of fluid samples at a very high pressure and at a high temperature, notably corrosive fluids.
2. Description of the Prior Art
The assignee's French patent FR-2,666,415 describes a device intended to carry out measurement operations on samples. It mainly comprises a climatic enclosure in which is placed a body including two cylindrical chambers of variable volume limited respectively by two mobile pistons. One of the chambers is provided with a transparent wall in order to facilitate the complete transfer of a phase of the sample towards the other chamber. A driving device is associated with the two pistons in order to move them in an independent or coordinated way. The device is operated by a micro-computer.
The assignee's French patent application FR-93/10,896 also describes a device for transferring samples under pressure, comprising a draw-off cell facilitating transfer operations of samples towards measuring devices exterior to a climatic enclosure.
SUMMARY OF THE INVENTION
The device according to the invention is suitable for many applications. It can notably be used with the scope of thermodynamic property studies for samples originally taken from wells drilled in underground reservoirs and subjected on the surface to pressure and temperature conditions that reproduce the conditions prevailing in the places where they were taken. These samples notably contain hydrocarbons, brines, carbon dioxide, hydrogen sulfide, etc. It can also be used for chemical engineering applications for the study of polymer solutions for example.
The object of the measurements is notably to assess the petroleum effluent content of the samples. The thermodynamic properties are calculated by using composition models in which data obtained through analysis of the samples are integrated. Certain parameters such as the pressure and the temperature for example are varied from values reproducing those existing at the production depth to those prevailing at the surface. Analysis methods of this type make it possible to measure important properties such as saturation pressures.
The samples are generally isolated in devices including a thermostatically controlled enclosure or drying oven, having one or several containment cells, suited to maintain each cell under pressure conditions analogous to those prevailing at the production depth. Certain measuring operations make it necessary to obtain a fraction of the samples contained in the containment cells while inside the enclosure. For easy handling and measurement precision, it is important to abide by certain conditions: conditions that prevail in the thermostatically controlled enclosure, the draw-off cell must therefore be simply coupled with the cell containing the substance to be taken so that it can be freed in the same way thereafter; measure easily its density and so that it can practically entirely be transferred into other measuring devices; and a measuring device such as a gasometer must be carried out automatically so that set values can be easily maintained.
The device according to the invention provides an operator the opportunity to perform very precise measurement operations on fluid samples extracted from underground, possibly corrosive fluids, kept at high pressures that can reach 130 to 150 MPa (mega pascals) and at high temperatures that can reach 250.degree. C. or even more.
The device comprises a thermostatically controlled climatic enclosure, a rigid containment body placed in the enclosure, provided with at least one elongated containment chamber of variable volume for fluid samples, limited by a mobile piston in a direction of elongation and a device of controlled communication with the outside of the chamber.
It comprises a transparent block made of sapphire for example, limiting the containment chamber on a side opposite the mobile piston, a seal for fastening the transparent block to the body, a display for viewing the i
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patent: 4425810 (1984-01-01), Simon et al.
patent: 4530234 (1985-07-01), Cullick et al.
patent: 4852395 (1989-08-01), Kolpak
patent: 4924695 (1990-05-01), Kolpak
patent: 5536474 (1996-07-01), Ungerer et al.
patent: 5540087 (1996-07-01), Bickert et al.
de Hemptinne Jean-Charles
Moracchini Gerard
Sanchez Jose
Ungerer Philippe
Institut Francais du Pe'trole
Politzer Jay L.
Williams Hezron E.
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