(57) A system and method for analysing gas from a borehole, the system comprising:- a
degasser (20,120) configured to degas drilling mud to remove at least a portion of
gas therefrom; an analyser (50,150), in gas communication with the degasser(20,120),
the analyser (50,150) configured to analyse gas samples and provide information relating
to the gas samples; the analyser (50,150) normally being a mass spectrometer(50,150);
wherein the system is configured such that drilling mud is degassed in the degasser
(20,120) for at least twenty seconds before at least a portion of gas removed therefrom
is transferred to the analyser(50,150). The resulting batch analysis provides a number
of important benefits. A degasser (20,120), cleaning mechanism, feedback system and
mud heater (16,116) are also disclosed.
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