08177305 is referenced by 56 patents and cites 1157 patents.

A system for treating a subsurface hydrocarbon containing formation includes one or more shafts. At least two substantially horizontal or inclined tunnels extend from one or more of the shafts. A plurality of heat sources are located in at least one heat source wellbore extending between at least two of the substantially horizontal tunnels. Electrical connections for the heat sources are located in at least one of the substantially horizontal tunnels.

Title
Heater connections in mines and tunnels for use in treating subsurface hydrocarbon containing formations
Application Number
12/422098
Publication Number
8177305 (B2)
Application Date
April 10, 2009
Publication Date
May 15, 2012
Inventor
Robert George Prince Wright
Houston
TX, US
Duncan Charles MacDonald
Houston
TX, US
Jochen Marwede
Rijswijk
NL
Horng Jye
Houston
TX, US
David Booth Burns
Houston
TX, US
Assignee
Shell Oil Company
TX, US
IPC
E21B 43/00
View Original Source