E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 49/00 (2006.01) E21B 47/00 (2006.01) G01N 33/24 (2006.01) G01N 33/28 (2006.01)
Patent
CA 2256248
A method is provided for establishing the quality of the hydrocarbon in a formation while drilling is revealed using a ratio of two sensors applied to gases liberated from the drilling mud. Two rare earth gas sensors, one gas sensor (TG) outputs a signal proportional to the relative concentration of light hydrocarbons. The second gas sensor DTG outputs a decreasing signal with increased concentrations of heavy hydrocarbons and an increasing signal with increasing concentrations of light hydrocarbons. The ration of two signals provides an indication of the quality of the hydrocarbon. By applying drilling information to the TG analysis, values for the fraction of hydrocarbon in the pores of a formation are determinable. The TG signals are normalized using a dilution factor for the volume of mud being analysed by the TG sensor compared to the overall circulation of mud, and a porosity factor determined for the drilled formation.
Na
Zamfes Kosta
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