High-Pressure Jet-Drilling Experiments in Some Hard Rocks

[+] Author and Article Information
A. C. Pols

Koninklijke/Shell, Exploratie en Produktie Laboratorium, Rijswijk, The Netherlands

J. Pressure Vessel Technol 99(2), 353-361 (May 01, 1977) (9 pages) doi:10.1115/1.3454541 History: Received June 28, 1976; Online October 25, 2010


The potential penetration rates of high-pressure jet bits drilling in hard rocks have been investigated experimentally. It has been found that the rates of penetration are much lower in hard, impermeable rock than in permeable rock [1]. Test results indicate that a laminated rock (Martelange schist) cannot be cut by jets at a high rate, which calls for hybrid bits. Isotropic rock can be jet-drilled at higher than conventional drilling rates, which may become profitable at daily rig costs in excess of approximately $20,000.

Copyright © 1977 by ASME
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