The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 02, 2008
Filed:
Dec. 14, 2005
Harry Barrow, Girton, GB;
Ashley Johnson, Milton, GB;
Michael Barrett, Histon, GB;
Charles Jenkins, Mawson, AU;
John Corben, Colonia Granada, MX;
Gary Rytlewski, League City, TX (US);
Harry Barrow, Girton, GB;
Ashley Johnson, Milton, GB;
Michael Barrett, Histon, GB;
Charles Jenkins, Mawson, AU;
John Corben, Colonia Granada, MX;
Gary Rytlewski, League City, TX (US);
Schlumberger Technology Corporation, Ridgefield, CT (US);
Abstract
This invention relates in general to measuring depth of well-tools, such as logging tools or the like, in a borehole. Embodiments of the present invention may provide for disposing transponders along a wireline that may be used to suspend and move the well-tool in the borehole, where the transponders may be disposed along the wireline at predetermined locations. A reader may be located at a reference location and may read when a transponder passes through the reference location and this information may be used to determine the depth of the well-tool in the borehole. Additionally, this invention provides for combining depth measurements from the transponders with measurements from odometer wheels in frictional contact with the wireline and/or time of flight measurements of optical pulses passed along a fiber optic cable coupled with the wireline to accurately and robustly measure the depth of the wireline in the borehole.