Abstract: Process for removal of organic acids from bitumen comprising(a) Bitumen is diluted with low-density hydrocarbons.(b) A dilute solution of caustic soda in water is intimately mixed with the diluted bitumen.(c) A demulsifying chemical is added to weaken the interfacial layers between the bitumen phase and the aqueous phase.(d) Coalescence between the droplets of the dispersed aqueous phase is achieved in an electrostatic dehydration vessel. Separation between the bitumen and aqueous phase is effected in the vessel.(e) The acid-reduced bitumen is removed from the top of the coalescer and the aqueous organic salt solution from its bottom.

Abstract: A process for metal plating the perforation tunnels in the cement sheath between casing and wellbore in a subterranean well to protect the cement from CO.sub.2 attack.

Abstract: An asphaltic crude oil is produced via a well system comprising a horizontal drainhole section extending through the reservoir formation. Formation plugging due to in-situ precipitation of asphalt during production operations is avoided by adequately sizing the horizontal drainhole section in the resevoir, thereby establishing near-wellbore pressures in the reservoir above the asphalt saturation pressure, without sacrificing production rates.

Abstract: In a process for completing and operating a well, which process involves passing carbon dioxide through a case, cemented and perforated well, carbon dioxide-induced damage of the cement is avoided by coating the cement tunnel walls so that the carbon dioxide is passed through perforation tunnels which have been internally coated by epoxy resin.