Abstract:In Tarim Oilfield the Ordovician carbonate reservoirs develop lots of cracks and caves. The formation pressure is very low(>6000m, less than65MPa), leading to the narrow mud weight window(MWW) problem. Serious lost circulation and reservoir damaged was encountered when we use the traditional overbalanced drilling method, also the oil and gas reservoirs cannot be discovered timely, therefore whole process underbalanced drilling technique must be employed. The underbalanced drilling technique has been app… Show more
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