Vibratory rotary drilling tool

Details Vibratory rotary drilling tool Vibratory rotary drilling tool

1983-01-26

1985-03-05

Leppink, James A.

Boring or penetrating the earth

Natural vibration characteristic of an element of boring...

175321, E21B 724

Patent

active

045025525

ABSTRACT:
A tool for improving drill bit penetration in the drilling of oil, gas and water wells and the like is provided. The tool includes a housing and a mandrel connected for co-rotation and limited axial movement under the influence of a spring fluid. The mandrel and drill bit in conjunction with the spring fluid form a spring-mass system having a damped fundamental frequency of oscillation approximately equal to a characteristic frequency of forces (F.sub.2) which act on the drill bit during drilling. Resonance causes the forces acting on the bit (F.sub.2) to be amplified and magnified, thereby increasing the drilling rate.

REFERENCES:
patent: 3163240 (1964-12-01), Bodine
patent: 3307641 (1967-03-01), Wiggins
patent: 4055338 (1977-10-01), Dyer
patent: 4257245 (1981-03-01), Toelke et al.
patent: 4303138 (1981-12-01), Bassinger
patent: 4331006 (1982-05-01), Bishop

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