Apparatus for providing a thrust force to an elongate body in a

Details Apparatus for providing a thrust force to an elongate body in a Apparatus for providing a thrust force to an elongate body in a

1996-02-23

1999-10-05

Dang, Hoang C.

Boring or penetrating the earth

Automatic control

Of advance or applied tool weight

175323, 1753253, E21B 4400, E21B 400, E21B 1908

Patent

active

059608951

ABSTRACT:
A downhole tool for providing a thrust force to an elongate body extending in a borehole formed in an earth formation is provided. The tool comprises at least one rotatable body provided with a plurality of rollers, each roller being expandable against the borehole wall at a selected contact force between the roller and the borehole wall. The rollers are oriented when expanded against the borehole wall so as to roll along a helical path on the borehole wall, and a motor is provided to rotate each rotatable body. The tool further comprises a device to measure the thrust force provided by the tool and a control system to control the thrust force provided by the tool by regulating the rotative torque of the rotatable body, in response to the measured thrust force.

REFERENCES:
patent: 4190123 (1980-02-01), Roddy
patent: 4365678 (1982-12-01), Fitch
patent: 5220963 (1993-06-01), Patton
patent: 5421420 (1995-06-01), Malone et al.

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