Well drilling apparatus

Details Well drilling apparatus Well drilling apparatus

1982-02-18

1984-03-20

Kazenske, E. R.

Tool driving or impacting

Drive by means reacting to rotating eccentric mass

175 52, E21C 1100

Patent

active

044375247

ABSTRACT:
A well drilling system designed to eliminate the usual rotary table, kelly and kelly bushing, and including a drilling unit having a tubular part connectible to the upper end of the drill string and a motor for driving that tubular part rotatively, with the drilling unit being mounted by a guide structure for vertical movement, and in addition being mounted for movement transversely of the axis of the well from the normal drilling position to at least one laterally offset position. Preferably, the drilling unit is movable to two different laterally offset positions, in one of which the drilling unit is above a mousehole location to pick up or release a pipe section, and in the other of which the drilling unit is at an inactive location at which it may remain during a trip of the drill string into or out of the well.

REFERENCES:
patent: 3835940 (1974-09-01), Winter
patent: 4262754 (1981-04-01), Nelson
Descriptive Data Bowen ES-7 Electric Drilling Swivel, Bowen Tools Inc., Houston, Tex., Jul. 1974.

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