New system provides continuous quantitative analysis of gas concentration in the mud during drilling New system provides continuous quantitative analysis of gas concentration in the mud during drilling Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2015-10-291991enContinuous monitoring of hydrocarbon gases in drilling fluids at the surface is essential for identification of prospective reservoir zones as well as for safety. This paper describes a new gas-analysis system that determines the total amount of gas in this mud below the bell nipple. The system is continuous, consistent, and fully quantitative (unlike a gas trap) but not labor-intensive (like a steam still). It also recovers and analyzes gas liberated into the air at the bell nipple, which test results have shown to be almost 50% of the total gas in the mud below the bell nipple.Δημοσίευση σε επιστημονικό περιοδικό http://creativecommons.org/licenses/by/4.0/SPE Drilling Engineering36 219-224 Roberts G. Kelesidis Vasilis Κελεσιδης Βασιλειος Williams J.