E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/35
E21B 43/24 (2006.01) E21B 36/00 (2006.01) E21B 43/30 (2006.01)
Patent
CA 1070611
ABSTRACT OF THE DISCLOSURE 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.
290950
Bombardieri Caurino C.
Butler Roger M.
Slevinsky Bruce A.
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