Back to results
US 7,255,183 B2Granted
Gap sub assembly
AssigneePhoenix Technology Services Inc.
InventorDavid Cramer
Life of this patent
Estimating the term…
Abstract
The gap sub assembly comprises a pair of electrically conductive subs. Each sub has a threaded pin and box. A pin and box are threaded together to form a connection. An electrically insulating, woven fabric overlies and conforms with the threads of the connection pin. An electrically insulating, annular washer separates the seal faces of the connection. The assembly functions to provide an electrical discontinuity when incorporated into a conductive drill string.
Claims9
An electrically insulating gap sub assembly for use in a drill string, comprising:
- tubular first and second subs, each having a threaded pin and box, the subs being connected end to end by a pin and box connection;
- and
- a layer of electrically insulating, woven fabric wrapping and conforming with the threads of the connection pin, so that the fabric layer electrically isolates one sub from the other by blocking current flow therebetween.
Dependencies are inferred from the claim text.