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How does steam soak recovery increase production from a heavy oil well?
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heavy oil and tar sand
Major oil fields of the Arabian-Iranian basin region.
Steam soak, also known as steam cycling, increases production from a heavy oil well by using heat to reduce the viscosity of the oil, which is otherwise too thick to flow easily.12
The process works through the following steps:
- Injection: Steam generated at the surface is injected into a production well for several weeks.12
- Soaking: The well is closed for a period, allowing the steam to condense within the reservoir. This condensation releases the heat of vaporization, which warms the surrounding oil.12
- Production: Once the oil is heated and its mobility is improved, the well is reopened for production. The heated oil flows into the wellbore and is lifted to the surface.2
This technique is most effective in thick, permeable reservoirs where vertical gravity drainage can occur. While the cycle can be repeated multiple times in the same well, recovery typically declines with each subsequent treatment.12