System for detecting gas in a wellbore during drilling

Details System for detecting gas in a wellbore during drilling System for detecting gas in a wellbore during drilling

E - Fixed Constructions

21

B

E21B 49/00 (2006.01) G01N 33/28 (2006.01) G01N 25/18 (2006.01)

Patent

CA 2490275

A system is provided for detecting the presence of formation gas in a stream of drilling fluid flowing through a wellbore during drilling of the wellbore. The system comprises at least one sensor chamber connectable to a drill string for drilling the wellbore, each sensor chamber containing a volume of a selected gas and having a membrane wall which allows passage of formation gas from the stream of drilling fluid into the sensor chamber. The sensor is arranged to detect a change of a selected characteristic of said volume of gas due to passage of formation gas from the stream of drilling fluid via the membrane wall into the sensor chamber.

L'invention concerne un système destiné à détecter la présence de gaz de formation dans un courant de fluide de forage s'écoulant à travers un puits de forage durant le forage d'un puits. Ce système comprend au moins une chambre de détection pouvant être connectée à une colonne de forage destinée à forer le puits de forage, chaque chambre de détection contenant un volume d'un gaz sélectionné et possédant une paroi de membrane permettant le passage du gaz de formation du courant de fluide de forage dans la chambre de détection. Le capteur est placé de manière à détecter un changement de caractéristique sélectionné du volume de gaz du fait du passage du gaz de formation par le courant de fluide de forage via la paroi de membrane dans la chambre de détection.

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