Bit cavitation increases drilling rate
Faster drilling rates may be possible with new rock-bit nozzles using cavitation. Tests show that cavitation jet nozzles have the capacity to improve drilling rates without applying more horsepower. Pressure drops required with the cavitating nozzles are in the range of 1,000 to 2,500 psi--a range available with many large conventional rotary drilling rigs. The effect on the drilling rate is pronounced even at low pressures. Cavitating nozzles can kerf both sandstone and hard rocks at 20 to 70% less energy input than steady-flow nozzle designs. Cavitating nozzles are not fully tested. The goal of this project is to create and test a very inexpensive drill bit addition which could have a very marked impact on drilling efficiency. A new soft-formation tungsten-carbide insert bit was presented to the conference. It features extended nozzles for better hydraulics and cutting action. Laboratory tests and the first 30 field runs show the new 2-cone bits have application in soft formations where long bit life and good hydraulics are desired.
- OSTI ID:
- 6561131
- Journal Information:
- Oil Gas J.; (United States), Journal Name: Oil Gas J.; (United States) Vol. 75:40; ISSN OIGJA
- Country of Publication:
- United States
- Language:
- English
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