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

2008-01-15

2008-01-15

Williams, Hezron (Department: 2856)

Measuring and testing

Borehole or drilling

Fluid flow measuring or fluid analysis

C073S152010

Reexamination Certificate

active

07318343

ABSTRACT:
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 has 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 the volume of gas due to passage of formation gas from the stream of drilling fluid via the membrane wall into the sensor chamber.

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