Selective plugging of oil wells

Claim 1

IN THE PRODUCTION OF AN OIL WELL HAVING A PACKEDOFF BOTTOM HOLE AND A PRODUCTION TUBING BETWEEN THE SURFACE AND THE BOTTOM HOLE OF THE WELL, THE METHOD OF SEALING OFF A PORTION OF THE PRODUCING FORMATION AT THE BOTTOM HOLE INCLUDING FLOWING DOWN THE TUBING FROM THE SURFACE AND SUBSTANTIALLY FILLING THE PACKED-OFF BOTTOM HOLE WITH PURE PETROLEUM ASPHALT EMULSIFIED WTH APPROXIMATELY THIRTY PRESENT WATER AND WITHOUT TEMPERATURE ELEVATION, FORCING THE SAME FROM THE BOTTOM HOLE INTO THE POROUS FORMATION WALL BY TRANSMISSION OF PRESSURE AGAINST THE HOLE CONTAINED BODY OF WATER EMULSIFIED ASPHALT AND THROUGH A TUBING CONFINED FLUID COLUMN, WHICH COLUMN PRESSURE APPLILCATION INJECTS THROUGH AND FILLS THE FORMATION PORES AT SAID BOTTOM HOLE WITH SOLID ASPHALT WHICH IS IMPERVIOUS TO WATER AND BLOCKS PRODUCTION AT A FORMATION WATER ZONE BUT IS SOLUBLE IN OIL AND DISSOLVES TO REOPEN OIL PRODUCTION FROM A FORMATION OIL ZONE.