Method and apparatus for detecting gas conveyed by drilling...

G - Physics – 01 – N

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G01N 21/35 (2006.01)

Patent

CA 2600290

A method of detecting gas conveyed in a drilling fluid (M) returning from a well (26), which method comprises the steps of: (a) extracting gas from said drilling fluid (M); (b) transmitting infra-red radiation through said gas; and (c) detecting with a detector (50) infra-red red radiation that has passed through said gas and providing an output signal representative thereof; characterised by the step of: (d) examining the intensity of a portion of the infra-red spectrum within a range of approximately 3.1~m and 3.6~m to estimate whether or not said gas comprises any light or heavy hydrocarbons.

La présente invention se rapporte à un procédé de détection de gaz acheminés dans un fluide de forage (M) ressortant d'un puits (26). Le procédé selon l'invention comprend les étapes consistant: (a) à extraire le gaz dudit fluide de forage (M) ; (b) à transmettre un rayonnement infrarouge à travers ledit gaz ; et (c) à détecter, à l'aide d'un détecteur (50), le rayonnement infrarouge qui est passé au travers dudit gaz, et à produire un signal de sortie représentatif dudit rayonnement. Le procédé selon l'invention est caractérisé en ce qu'il comprend également l'étape consistant (d) à examiner l'intensité d'une partie du spectre infrarouge dans une plage s'étendant de 3,1 ?m à 3,6 ?m environ, afin d'estimer si ledit gaz contient des hydrocarbures légers ou lourds.

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