04116275 is referenced by 63 patents and cites 9 patents.

Disclosed is a method for recovering hydrocarbons from a hydrocarbon-bearing formation. A wellbore is drilled to penetrate the formation and to extend, preferably substantially horizontally, into the formation for a suitable distance. The well is completed with a slotted or perforated casing means and with dual concentric tubing strings. The tubing strings comprise an inner tubing and a surrounding larger diameter outer tubing. The inner tubing cooperates with the outer tubing to form a first annular space and the outer tubing cooperates with the casing means to form a second annular space. After the wellbore is suitably completed, a heated fluid is circulated within the casing means such that the heated fluid passes through a portion of the first annular space to heat the well and to provide a fluid flow path through both the first and second annular spaces. After the well is suitably heated, a heated fluid is injected into the formation through at least a portion of the second annular space. Subsequently, formation hydrocarbons are produced from formation by means of the well.

Title
Recovery of hydrocarbons by in situ thermal extraction
Application Number
5/777292
Publication Number
4116275
Application Date
March 14, 1977
Publication Date
September 26, 1978
Inventor
Bruce Alexander Slevinsky
Calgary
CA
Caurino Cesar Bombardieri
Calgary
CA
Roger Moore Butler
Calgary
CA
Agent
Michael D Nametz
Gary D Lawson
Assignee
Exxon Production Research Company
TX, US
IPC
E21B 43/24
View Original Source