Process of improving heavy oil recovery using a combination of downhole heater system, and chemical formulation composed of solvents and surfactants

A method for recovering heavy oil from a reservoir, comprising:

• placing one or more downhole mechanical heaters in an injection wellbore;
• injecting a fluid composition comprising a dialkyl ether and water through the one or more downhole mechanical heaters;
• mechanically heating the fluid composition with the one or more downhole mechanical heaters to form a heated fluid composition,
• mixing the heated fluid composition with the heavy oil in the reservoir;
• decreasing a viscosity of the heavy oil;
• and
• collecting a mixture of the heated fluid composition and the heavy oil from a production wellbore.

A method for recovering heavy oil from a reservoir, comprising:

• placing a downhole heater in an injection wellbore;
• injecting a fluid composition comprising a dialkyl ether through one or more downhole mechanical heaters;
• mechanically heating the fluid composition with the one or more downhole mechanical heaters to form a heated fluid composition, wherein the injecting and the heating of the fluid composition is performed by a huff-n-puff method;
• mixing the heated fluid composition with the heavy oil in the reservoir;
• decreasing a viscosity of the heavy oil;
• and
• collecting a mixture of the heated fluid composition and the heavy oil from a production wellbore.