Title:
ROLLER DEVICE
Document Type and Number:
WIPO Patent Application WO/2014/076481
Kind Code:
A3
Abstract:
A roller device for incorporation into a wireline tool string for use in an oil or gas well has a body with rollers comprising captive bearings arranged on the outer surface of the body to rotate around more than one axis relative to the body, and wherein the rollers are arranged in at least one or more helix around the body. Each helix completes at least one full circumferential turn around the body. The rollers circumferentially overlap one another on the body, so that when the body engages the inner wall of the wellbore, the entire circumference of the body is supported by at least one roller.
Inventors:
WOOD CARL (GB)
O'BRIEN HARRY RICHARD STANLEY (GB)
O'BRIEN HARRY RICHARD STANLEY (GB)
Application Number:
PCT/GB2013/053007
Publication Date:
November 27, 2014
Filing Date:
November 14, 2013
Export Citation:
Assignee:
NAT OILWELL VARCO UK LTD (GB)
International Classes:
E21B17/10
Foreign References:
| US5715898A | 1998-02-10 | |||
| US5522467A | 1996-06-04 | |||
| US20030159834A1 | 2003-08-28 |
Attorney, Agent or Firm:
MURGITROYD & COMPANY (165-169 Scotland Street, Glasgow Glasgow G5 8PL, GB)
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