Because of the large formation dip angle in Hailaer area of Daqing Oilfield, deflection control is very difficult; while the fluorescence grade of cuttings is low, cutting logging is also a problem. To obtain cuttings debris large enough for cutting logging, and at the same time improve ROP, so as to achieve the goal of deflection control and vertical drilling, a testing plan is made by using the Model B425 large cutter PDC bit, and combining with the use of small pendulum BHA. Tests show that the debris cu...
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