Combined replacement drive process for oil recovery

Details Combined replacement drive process for oil recovery Combined replacement drive process for oil recovery

E - Fixed Constructions

21

B

166/35

E21B 43/00 (2006.01) E21B 43/24 (2006.01) E21B 43/26 (2006.01)

Patent

CA 1240263

ABSTRACT Performing steam drive operations in critical manipulative steps can improve the recovery of viscous hydrocarbons from tar sand deposits. Steam is injected into an injection well at a rate that is less than the rate needed to fracture the formation, and fluids are simultaneously produced from a communicating production well. When steam breakthrough occurs at the production well, the production well is shut-in, and the injection rate is increased to a rate at least sufficient to fracture the formation. After the reservoir is sufficiently heated, injection ceases and production resumes. Once the production rate declines to a rate that is no longer efficient, the process can be repeated.

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