Drive mandrel for a drilling stem

Details Drive mandrel for a drilling stem Drive mandrel for a drilling stem

1979-08-24

1981-06-16

Baldwin, Robert D.

Tool driving or impacting

Means to drive tool about an axis

Relatively fixed drive for an advancing tool

24263DA, 279 4, B23B 3130, E21B 1100, E21C 900

Patent

active

042732000

ABSTRACT:
The invention relates to a drive mandrel for a drilling stem. The mandrel comprises a tubular element traversed by the drilling stem and having openings for the passage of jaws urged against the stem under the action of wedges. The wedges are spring biased against the jaws, and repelled from said jaws by hydraulic thrust. The wedges are mounted on an axially adjustable flange.

REFERENCES:
patent: 3212591 (1965-10-01), Tucker
patent: 3301334 (1967-01-01), Odgers et al.
patent: 3692320 (1972-09-01), Lindelof et al.
patent: 3992019 (1976-11-01), Crawshay
patent: 4196914 (1980-04-01), Kutman et al.

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