Method and system for extracting, analyzing and measuring constituents transported by a bore fluid

An extraction, analysis and measuring system intended for constituents carried along by a well fluid during drilling operations, characterized in that it comprises in combination:

• draw-off means (4) for taking a determined volume of said fluid,
• extraction means (3) for extracting in vapour form said constituents contained in said volume of fluid, comprising a space placed under underpressure,
• a vapour transport line (14) whose first end communicates with said space, the second end being connected to a vacuum pump (21),
• sampling means (27) placed in the vicinity of the second end, comprising a sampling loop (53) allowing to sample a determined amount of the vapours circulating in said line,
• distribution means (50) for injecting said amount into analysis and measuring means (31), and
• control means (33) for controlling the temperature of said sampling means so as to prevent condensation of said amount of vapours.