Britannica
Sources used in this answer
Why is a heavy oil well closed for several days after steam is injected during a steam soak?
Created from Britannica articles
using AI.
AI can make mistakes, so verify using Britannica articles.
heavy oil and tar sand
Major oil fields of the Arabian-Iranian basin region.
In the process of steam soak—also known as steam cycling—a well is closed for several days after steam injection to allow the steam to condense within the reservoir.12
This period of closure is essential because the condensation process releases the latent heat of vaporization into the surrounding formation. Heavy crude oils are naturally highly viscous, which impedes their flow. By allowing the steam to condense and transfer this heat to the reservoir, the viscosity of the oil is significantly reduced, thereby improving its mobility and enabling it to flow into the wellbore once production resumes.13