04007788 is referenced by 6 patents and cites 8 patents.

A method of recovering bitumen from a subterranean tar sand formation characterized by a plurality of steps. First, a continuous wellbore having a second section thereof contained within the formation and first and third sections thereof extending the second section to the earth's surface is formed. Next, the first and third sections of the wellbore are cased. Thereafter, a heated fluid is circulated through the wellbore contacting the formation to reduce the viscosity of the bitumen contained therein rendering the bitumen mobile. Subsequently, bitumen mobilized by the heated fluid is recovered via the wellbore.

Title
Recovery of bitumen from tar sands
Application Number
5/584515
Publication Number
4007788
Application Date
June 6, 1975
Publication Date
February 15, 1977
Inventor
Eddie Paul Howell
Plano
TX, US
John Howard Striegler
Richardson
TX, US
Agent
Ronnie D Wilson
Assignee
Atlantic Richfield Company
CA, US
IPC
E21B 43/24
E21B 7/04
View Original Source