Patent ID: 8776837

Claim:
A down-hole oil pipe comprising a rigid pipe and a lining exposed to oil, the lining comprising a primer layer adhered to the interior surface of the pipe, and an overcoat disposed on top of the primer layer, wherein the overcoat comprises multiple layers including a lower layer and an upper layer, where the upper layer has an exterior anti-stick surface exposed to the oil and comprises a copolymer of tetrafluoroethylene with at least one perfluoro(alkyl vinyl ether), the alkyl containing from 1 to 8 carbon atoms, the lining thereby reducing the deposition of at least one of asphaltenes, paraffin wax, and inorganic scale as compared to the interior surface of the oil pipe without the lining being present, so as to avoid pluggage of the rigid pipe, wherein the overcoat is applied as a liquid based composition.