In heavy oil reservoirs, viscosity of fluids is very high and the mobility of the fluids in the reservoir is very low. Different production scenarios are used, depending on oil and reservoir properties, such as cold heavy oil production with sand (CHOPS) or steam-assisted gravity drainage (SAGD). In the former method, a progressive cavity pump is used to extract oil, water, gas, and sand simultaneously from the reservoir; in the latter, the viscosity of the fluid is lowered by injecting steam into the reservoir.

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