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The range of application of new diamond impregnated drill bit technology continues to expand into lithologies normally drilled with roller cone bits. Historically, application of impregnated drill bits has been restricted to deep intervals that contain mainly hard and abrasive sandstone. Conversely, PDC bits perform best in relatively softer, non-abrasive rock. This left a very common sequence of formations, hard abrasive sandstone interbedded with soft shale, to be drilled with either roller cone or PDC bits. None of the two choices has delivered satisfactory performance in terms of penetration rate and bit life. Working with several operators, the bit company has conducted extensive laboratory and field development tests that have resulted in a new generation of aggressive diamond impregnated bits that offer unique advantages for drilling mixed formations more economically. The authors will outline the new impregnated technology in the context of its application and give examples on how to best apply it to achieve maximum performance. The following case studies will demonstrate significant performance improvement and illustrate an expanded range of applications for impregnated diamond bits. Oman: 8-3/8" impregnated bit set new cumulative footage record of 1130 meters drilling in two fields in central Oman. Algeria, Rhourde Nouss field: Set longest bit run through Grés de Oued Saret to Quartzites de Hamra, drilling 97 meters further than best offset and replaced 2-4 bit runs. Algeria Hassi Messaoud field: Broke country single run footage record (361 meters); doubled footage over conventional impregnated technology while achieving the best penetration rate through the interval. Venezuela: Replaced three roller cones bits relative to hole section in offset wells. |
