A new drilling technique using vortex action at rock-bit interface (part 1)
Due to a great deal of information available, this paper has been arranged in two parts. The paper presented here deals with Part I. In this part, theory and laboratory data of the DVG (Downhole Vortex Generator) Sub, which is run immediately on top of the standard bits, is introduced. In the models, the authors have emphasized changes in drilling strengths and crossflow as a result of vortex action. The theoretical as well as field data indicate an average increase of penetration rate to fall within 10 to 75 percent for 9-7/8'' holes. Furthermore, on the basis of laboratory data, it was concluded that (1) the vortex pressure drop increases as the DVG sub nozzle angle to the horizontal plane decreases, (2) there is a non-linear increase of the vortex pressure drop with flowrate, (3) the DVG sub maximizes the crossflow velocities below the jet bit by suppressing the impact vortex formed as a result of the jet impact near the cones.
- Research Organization:
- Univ. of Southwestern Louisiana
- OSTI ID:
- 6869975
- Report Number(s):
- CONF-840495-
- Journal Information:
- Soc. Pet. Eng. AIME, Pap.; (United States), Vol. SPE12791; Conference: Society of Petroleum Engineers California regional meeting, Long Beach, CA, USA, 11 Apr 1984
- Country of Publication:
- United States
- Language:
- English
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MATHEMATICAL MODELS
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ROCK-FLUID INTERACTIONS
ROTARY DRILLING
WELL DRILLING
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