Oil recovery well paraffin elimination means

Claim 1

An injection well comprising: a bore hole having a perimeter and extending from ground surface level into or through an oil-bearing earth formation, a casing being an electrically-conductive hollow casing extending along the perimeter of the bore hole from ground surface level to a level at or below the oil-bearing earth formation and having multiple perforations throughout a portion thereof adjacent the oil-bearing earth formation, seallng means being two spaced-apart high-pressure-resistant plugs sealing the casing, the first such plug being at an elevation above and the second plug being at an elevation below at least a portion of the oil-bearing earth formation, electrode means comprising means to conduct current into the bore hole from ground surface level through the first plug to a lower extremity in the space between the two plugs, said electrode means being externally electrically insulated from the ground surface level to and including the level of the first plug, but to a level which is significantly higher than the lower extremity, connecting means electrically connecting said electrode to said casing, said connecting means being disposed at an elevation between said two spaced-apart plugs, liquid conduit means comprising means to conduct a liquid pressure means comprising means to supply a liquid at a pressure of at least 400 psi to the space between the two plugs, and an electric-power supply comprising means to produce an electric current flow through said casing, said connecting means and said electrode.