Percussion drilling technology was considered many years ago as one of the best approaches for hard rock drilling. Unfortunately, the efficiency of most hydraulic hammer (HH) designs was very low (8 percent maximum), so they were successfully used in shallow boreholes only. Thirty years of research and field drilling experience with HH application in former Soviet Union (FSU) countries led to the development of a new generation of HH designs with a proven efficiency of 40 percent. That advance achieved good operational results in hard rock at depths up to 2000 m and more. The most recent research has shown that there are opportunities to increase HH efficiency up to 70 percent. This paper presents HH basic design principles and operational features. The advantages of HH technology for coiled-tubing drilling is shown on the basis of test results recently conducted in the USA. [S0195-0738(00)00101-1]

Knott, D., 1996, “Deep Thoughts on Drilling Technology,” Oil & Gas Journal, June 10, p. 29.
“High ROP Hammer Drill Sets Australian Records,” 1996, Hart’s Petroleum Engineer International, Sept., p. 13.
Gelfgat, M., Gamsakhurdia, G., Geise, J., and Spierings, H., 1994, “Complete System For Continuous Coring With Retrievable Tools In Deep Water,” IADC/SPE Paper 27521, Dallas, TX.
Finger, J. T., 1984, “Investigation of Percussion Drills for Geothermal Application,” J. Pet. Tech., Dec., pp. 2128–2136.
Graf, L. E., and Kogan, D. I., 1972, Hydro-Percussion Machines and Tools, Nedra, Moscow, Russia.
Kichigin, A. V., Nazarov, V. I., and Tagiev, E. I., 1965, The Percussion-Rotary Wells Drilling, Nedra, Moscow, Russia.
Kiselev, A. T., and Krusir, I. N., 1982, Rotary-Percussion Drilling of Geological Prospecting, Wells, Nedra, Moscow, Russia.
Melamed, Y. A., 1993, “The Hydraulic Impact Technology: Large Possibilities and Wide Application Spectrum,” Razvedka I Okhrana Nedr (Russian Journal “Bowels of the Earth Prospecting & Protection”).
Operations Manuals & Technical Descriptions, 1988, “Hydro-Percussion Drilling Techniques and Technology,” USSR Ministry of Geology, Moscow, Russia.
Yasov, V. G., 1977, The Theory and Calculations of the Hydraulic Machines Operational Processes, Nedra, Moscow, Russia.
Kiselev, A. T., and Melamed, Y. A., 1984, “Perspectives of the Rotary-Percussion Drilling Development with High-Frequency Hydro-hammers with Low Flow Rates,” Proceedings, High School: Geology and Prospecting, No. 11, pp. 85–94.
Melamed, Y. A., 1995, “The Theoretical Ground And Techniques For Hydro-Percussion Core Drilling Development,” doctor of science thesis, Geological Prospecting Academy, Moscow, Russia.
Smirnov, V. G., 1983, “The Research In The Design Elements Of Three-Cone Drill Bits 76 mm Diameter With Sleeve Bearing,” Techniques for the Advanced Drilling Methods, Moscow, VPO “Souzgeotechnika,” pp. 108–122.
Bodrov, S. M., Ivanovskaya, N. I., and Burinskyi, G. G., 1991, “Cone-Type Drill Bits III59K-TsA and III46K-TsA,” Razvedka I Okhrana Nedr (Russian Journal: “Bowels of the Earth Prospecting & Protection”), No. 5, pp. 24–26.
You do not currently have access to this content.