Open hole tractor with tracks

Boring or penetrating the earth – With self-acting cyclic advance and retraction of tool or...

Reexamination Certificate

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Details

C175S090000, C175S106000

Reexamination Certificate

active

10891782

ABSTRACT:
A downhole tractor is provided that may be used in open or cased wells, and is also designed for use in open holes having a variety of soil/formation consistencies (e.g., soft, firm, rigid, etc.), varying diameters and non-uniform and irregular bore profiles. The tractor may include a track assembly including a plurality of idler wheels and a continuous track rotatably disposed around the idler wheels. A motor may be adapted to rotate the track around the idler wheels. Upper and lower arms may be pivotally connected to opposite ends of the track assembly and pivotally connected to a tractor housing. An actuator arm or link assembly may be provided to impart an outward force to the track assembly to move the track assembly outwardly into an open position and a retracting force to retract the track assembly into a closed position. A rotatable screw may be connected to a second motor, or a rod may be connected to a hydraulic system, to actuate the actuator arm or link assembly.

REFERENCES:
patent: 5184676 (1993-02-01), Graham
patent: 5794703 (1998-08-01), Newman
patent: 5954131 (1999-09-01), Sallwasser
patent: 6082461 (2000-07-01), Newman
patent: 6089323 (2000-07-01), Newman
patent: 6179055 (2001-01-01), Sallwasser
patent: 6273189 (2001-08-01), Gissler
patent: 6629568 (2003-10-01), Post
patent: 6920936 (2005-07-01), Sheiretov et al.
patent: 2002/0102136 (2002-08-01), Holland
patent: 2005/0145415 (2005-07-01), Doering et al.
patent: 2005/0263325 (2005-12-01), Doering et al.
patent: WO 2005/068773 (2005-07-01), None

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