Industrial Technologies Technology of vibratory-rotary drilling with the use of drilling assemblies with a high-frequency cavitation hydrovibrator
Technology of vibratory-rotary drilling with the use of drilling assemblies with a high-frequency cavitation hydrovibrator
Description
Essence of the technology:
The imposition of high-frequency, high-amplitude vibrations on the rock-cutting tool and the generation of a pulsating drilling mud flow.
Purpose:
Enhanced efficiency of the ro-tary drilling of holes 36 mm to 250 mm in diameter trough various rocks.
Innovative Aspect and Main Advantages
The freedom from moving parts and springs and the enhanced reliability of the drilling assembly make it possible to drill deep holes by vibratory-rotary drilling without need for depth control. The hydrovibrator is capable of imparting to the rock-cutting tool longitudinal vibration accelerations of peak-to-peak amplitude 50g to 15,000g in the frequency range 100 to 10,000 Hz. The cavitation hydrovibrator (Fig. 1) is easy to mount in the drilling string ahead of the rock-cutting tool or core barrel.
Approbation:
Testing on an experimental drilling ground has shown that the cavitation hy-drovibrator offers a 60 to 70 percent in-crease in drilling rate, a more than two-fold increase in rock-cutting tool durabil-ity, and a higher recovery of core in drill-ing trough fissured rocks.
Areas of Application
Drilling companies in different countries.
Fig. 1 High-frequency cavitation hydrovibrator
Fig. 2 Time history of the pressure pulsations (P2) at the hydrovibrator outlet and the vibration
acceleration the hydrovibrator sets up on its body (a2) and on the rock-cutting tool (a3)
Fig. 3 Schematic of the working process in the cavitation hydrovibrator
Fig. 4 Hydrovibrator with a roller bit
Fig. 5
Contact Details
Ivan Man’ko, Ph.D., Senior Researcher,
phone: + 380 562 471 235,
fax: + 380 562 473 413,
e-mail:
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