A new gas logging system has been developed, field-tested and is now fully integrated in mud-logging units. In this system, the volume of mud put through degassing per time unit is a constant, whatever the actual drilling mud flowrate may be. Also, the greater amount of energy spent at the degasser increases extraction efficiency. Moreover, mud samples can be taken close to the bell nipple, without modifying the rig equipment, thus reducing surface gas losses. The gas show analysis is done through a double Flame Ionization Detector (FID) system, faster than most conventional systems. The sensitivity, even at low detection level, is remarkable. Field tests have been performed in the Paris Basin, where the GOR of the oil produced is very low. When conventional gas analysis devices do not detect anything, the new gas logging system enables a clear reservoir identification with good correlations with wireline logs. Another main feature of the system, also demonstrated by field tests performed in the North sea, is its ability to determine the compositional ratios of the light end components of reservoir fluids. This was verified by correlations with analyses of the associated gas produced with oil. The quality of the measurements performed by the new gas logging system will probably reinforce the reliability of mud-logging formation evaluation techniques.
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