Gas-detection technology defines oil-gas-water contacts

Mudlogging technology-1Differential total gas (DTG), a mudlogging technology that uses dual gas detectors to compare response profiles, can quantitatively measure heavy hydrocarbons (C3-C5) in the gas stream, allowing wellsite personnel to distinguish between gas, oil, and water contacts.Reservoir evaluation using this patented technology involves the normalization of raw DTG and other real-time drilling data (penetration rates, fluid properties), leading to the computation of a hydrocarbon saturation index and hydrocarbon ratio.Whereas data normalization accounts for the amount of rock drilled, variations in the volume of mud dilution, and the gas-carrying properties of the drilling mud,...

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