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How does solvent extraction recover heavy oil underground?
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heavy oil and tar sand
Major oil fields of the Arabian-Iranian basin region.
To recover heavy oil from underground reservoirs using solvent extraction, a solvent or an emulsifying solution is injected directly into the reservoir.1
As this fluid moves through the permeable rock, it dissolves or emulsifies the heavy oil, effectively mobilizing it. Once the oil has been integrated into the fluid, the mixture is pumped to the surface through production wells. Upon reaching the surface, the oil is separated from the solvent, which is then recycled for further use in the extraction process.1