Method for determining a steam dryness factor

Details Method for determining a steam dryness factor Method for determining a steam dryness factor

G - Physics

01

N

G01N 25/60 (2006.01) E21B 43/24 (2006.01)

Patent

CA 2644596

The aim of the invention is to provide a simple field-applicable method which is devoid of additional equipment and is used for determining a steam dryness factor directly when the process of thermal treatment of high-viscosity oil formations is carried out. The aim is attained by the inventive method consisting in adding a gas incondensable when pumped in a well to a saturated water steam pumped therein. The presence of the incondensable gas in a mixture modifies the steam partial pressure, in such a way that the steam dew-point temperature is also modified. The results of temperature or pressure measurement in the well bore are used for calculating the steam dryness factor.

L'invention a pour but d'obtenir un procédé simple, applicable sur le terrain et ne nécessitant pas de matériel supplémentaire, qui permet de déterminer le degré de sécheresse d'une vapeur directement dans un processus de traitement thermique de formations contenant du pétrole à viscosité élevée. A cette fin, le procédé selon l'invention consiste à ajouter, à de la vapeur saturée en eau injectée dans un puits de forage, un gaz qui n'est pas condensable lorsqu'il est injecté dans un puits. La présence du gaz non condensable dans le mélange modifie la pression partielle de la vapeur, ainsi que la température de condensation de la vapeur. Les résultats de la mesure de la température et de la pression dans le puits de forage servent à calculer le degré de sécheresse de la vapeur.

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