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SINGLE HORIZONTAL WELLBORE PROCESS FOR THE IN-SITU EXTRACTION OF VISCOUS OIL BY STEAM STIMULATION
SINGLE HORIZONTAL WELLBORE PROCESS FOR THE IN-SITU EXTRACTION OF VISCOUS OIL BY STEAM STIMULATION
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机译：蒸汽刺激原位萃取粘稠油的单水平井工艺
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摘要
Disclosed is a method for recovering highly viscous oil from a formation penetrated by a single horizontal wellbore using steam stimulation. A wellbore is drilled into the formation comprising a substantially vertical section and a substantially horizontal section. The vertical section of the wellbore is completed with a casing and a production tubing that extends from the surface to the beginning of the horizontal wellbore. The horizontal section of the wellbore is completed with a slotted lined and the entire wellbore is completed with an injection tubing that extends from the surface to the far end of the horizontal wellbore. After the wellbore is completed, steam is circulated in and out the horizontal wellbore at a pressure below the formation's fracture pressure to heat the formation surrounding the horizontal wellbore by transient conduction and steam-lift fluids from the horizontal wellbore. Circulation of the steam is continued until the temperature of the horizontal wellbore reaches the saturation temperature of steam at horizontal wellbore pressure. Thereafter, a slug of steam is injected into the horizontal wellbore below fracture pressure followed by a short soak period. The well is then flowed back until the amount of produced fluids substantially decline. Steam circulation is resumed and steam-lifted fluids including oil are recovered until the oil recovery is unfavorable. The sequence of steam slug injection, soak period, flow back and steam circulation is repeated for a plurality of cycles until the rate of oil is then favorable.
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