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
1996-09-06
1998-05-26
Brock, Michael
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Content or effect of a constituent of a liquid mixture
73 6146, 73 6147, G01N 714
Patent
active
057568847
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
1. Background of the Invention
The present invention relates to a device for determining, on a production site, characteristics of fluid samples extracted from the subsoil, notably from petroliferous areas, and more particularly to a compact site device that can be easily transported to production sites.
2. Description of the Prior Art
It is customary to study the thermodynamic properties of samples extracted from wellbores with a view to developing underground deposits of effluents such as petroleum effluents. A good knowledge of these thermodynamic properties allows assessment of the subsurface reserves, to optimize the production installation or to specify the methods of operation. The thermodynamic properties are calculated by using composition models into which data obtained by analyzing the samples are integrated.
A so-called "PVT" type analysis method for example allows measurement of the behavior of samples including certain parameters of which, such as pressure and temperature, are varied for example from values replicating those existing at their depth in a well to those prevailing at the surface. Methods of analysis of this type make it possible to measure important properties such as the "bubble point" indicating the appearance of a gas phase in the sample tested, the compressibility coefficient, the viscosity, the density, the GOR, etc, as it is known.
The Assignee's French patent 2,666,415 describes a device for performing thermodynamic measurements on small-volume samples in a laboratory or on a site. This device comprises a thermostat-controlled enclosure, a supporting structure with two plates on either side of a transparent sapphire block for example and two small-section cylindrical chambers defined by two sliding pistons moved in both chambers by mechanical drive means including threaded rods driven into rotation by shafts coupled with motive means. Seals are arranged in grooves provided in the wall of the two chambers, around both pistons. The first chamber is partly visible through the transparent block, and it ends in a bevel at the top of which opens a line communicating with the second chamber by means of a valve. A capillary tube connects the two chambers to each other and allows viscosity measurements to be performed on the samples. On account of its compactness, this prior device can be easily transported to the sampling sites.
SUMMARY OF THE INVENTION
The invention allows measurement directly on a production site of characteristics of fluid samples extracted from the subsoil, notably from petroliferous areas. It comprises, in a thermostat-controlled enclosure, a body including a first chamber and a second chamber placed above the first one, the first chamber at least comprising a pointed end, and the volumes of these two chambers being variable by shifting mobile elements in two cylinders, means for moving the two mobile elements, means for transferring fluids into or out of the chambers, and controlled communication means between the two chambers.
The device according to the invention allows performing on site extensive thermodynamic measurements by relieving operators of many operating sequences. It also allows samples to be validated in order to check that they are really representative of the samplings that have been achieved, prior to sending them to a central laboratory for more complete analyses.
These previous measurements and analyses performed on site with samples of very small volume allow avoiding the long and costly conventional solutions consisting of sending systematically samples to a distant laboratory, which must sometimes be repeated when it turns out that the samples are not valid and representative. Using the device according to the invention therefore allows saving of time and making significant savings.
The device according to the invention allows for example, in the case of oil type petroleum samples, measurement of their GOR (gas-oil-ratio), the "bubble point" and the density of the oil, and in the case of gas type samples, me
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Behar Emmanuel
Moracchini Gerard
Sanchez Jose
Brock Michael
Institut Francais du Pe'trole
Societe ROP
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