Improved ROP in Ultrahard Rock

Drilling the hard and very abrasive Bunter formation in northwest Germany has been a challenge for 40 years. Low rates of penetration (ROPs) and high tool wear are common. The full-length paper details the analysis of historical data and the combination of bits, motors, and other bottomhole-assembly (BHA) components to improve ROP. The combination of new impregnated bits, new downhole motors, and improved hydraulics was the basis for the improvement.

View a Synopsis of SPE 99045

This article, written by Assistant Technology Editor Karen Bybee, contains highlights of paper SPE 99045, "ROP Enhancement in Ultrahard Rock," by M. Roehrlich and K.-U. Belohlavek, ExxonMobil Development Co., prepared for the 2006 IADC/SPE Drilling Conference, Miami, Florida, 21-23 February. The paper has not been peer reviewed.

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