| 摘要 |
<p>Steam is injected into the tubing positioned in a casing in a well bore to conduct heat to a formation in the well bore. Foam is injected into the casing annulus surrounding the tubing to assist in retaining heat in the steam that is injected into the tubing, and thereafter slugs of steam and foam are alternately injected into the tubing and circulated down the well bore and then upwardly out of the well bore through the casing annulus to assist in the flow of viscous hydrocarbons from the well bore formation as well as cleaning the well bore and formation.</p> |
