Method in rotary drilling and rotary drilling apparatus

Details Method in rotary drilling and rotary drilling apparatus Method in rotary drilling and rotary drilling apparatus

1988-12-21

1990-11-20

Watts, Douglas D.

Tool driving or impacting

Processes

173 4, 175 27, 175162, 175203, E21B 700, E21B 1908

Patent

active

049711580

ABSTRACT:
In a rotary drilling apparatus, a rotary head is advanced against an object to be drilled and a neck element included in the rotary head and connected with drilling member is rotated around its longitudinal axis relative to a rotary head body. The neck element is subjected, in a normal drilling situation to the action of two oppositely-directed forces produced by means of a pressure medium, the first force acting in the drilling direction and the second force acting in the direction opposite to the drilling direction, the first force being greater and the difference between the forces producing a feeding force. The neck element is movable in the direction of the feeding force. In a drilling situation, when the force acting in the direction opposite to the feeding force is greater than the feeding force, the neck element moves in the direction opposite to the drilling direction relative to the rotary head body. During this movement, the first force is maintained at least equal to that which is required in a normal situation and the action of the second force is eliminated. As the force exerted on the neck element opposite to the feeding force is diminished, the action of the first and second forces, and thus the feeding force is restored with the neck element moving in the drilling direction.

REFERENCES:
patent: 3233689 (1966-02-01), Whittle
patent: 3525404 (1970-08-01), Newman et al.
patent: 3550697 (1970-12-01), Hobhouse
patent: 3734202 (1973-05-01), Gyongyosi
patent: 3917006 (1975-11-01), Kellner
patent: 4721172 (1988-01-01), Brett et al.

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