Title:
ELECTRICALLY POWERED TRACTOR
Document Type and Number:
WIPO Patent Application WO/2008/157428
Kind Code:
A3
Abstract:
An electrically powered and controlled tractor system includes one or more electric gripper assemblies (20) and one or more electric power train assemblies (30). Power and control signals for the gripper assemblies (20) and power train assemblies (30) can be delivered from a ground surface via a wireline (40). The gripper assembly (20) employs a motor-activated lead screw (216) and nut (214) combination to expand passage-gripping elements (206), preferably by pushing the gripping elements (206) radially outward from locations between opposing ends (207) of the gripping elements (206). A failsafe mechanism can retract the gripping elements (206) during a power interruption. The power train assembly (30) employs a motor-activated lead screw (312) and nut (314) combination to expand and contract two ore more telescoping members (302, 304, 306). The tractor system can include multiple tractor units (10) that each includes one gripper assembly (20) and one power train assembly (30). A tractor (700) can include one power train assembly (720) and two gripper assemblies (730).
Inventors:
MOORE NORMAN BRUCE (US)
Application Number:
PCT/US2008/067016
Publication Date:
November 04, 2010
Filing Date:
June 13, 2008
Export Citation:
Assignee:
WESTERN WELL TOOL INC (US)
International Classes:
E21B4/18; E21B4/04
Foreign References:
| US5794703A | 1998-08-18 | |||
| US6920936B2 | 2005-07-26 | |||
| US6629568B2 | 2003-10-07 | |||
| US5954131A | 1999-09-21 | |||
| US20070095532A1 | 2007-05-03 |
Attorney, Agent or Firm:
SIMPSON, Andrew, H. (Martens Olson & Bear, LLP,2040 Main Street,14th Floo, Irvine CA, US)
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