Gas e.g. hydrocarbon, concentration determination device for drilling unit, involves measuring information representing gas quantity in extracts of drill mud analysis sample, and calculating gas concentration based on quantity and one curve

摘要

The method involves establishing a set (310) of curves representing the extraction of a given gas contained in drill mud, based on the measurements made during the stages of a gas extraction from a calibration sample. The information that represents a given gas quantity (q d1) in gas extracts of a drill mud analysis sample, at a stage of gas extraction of the analysis sample, in preset conditions is measured. The concentration of the gas is calculated based on the given gas quantity (q d1) and the curve (309).