Method of completing oil wells

Claim 1

THE METHOD OF COMPLETING AN OIL WELL WHEREIN A SELECTED PRODUCTION FORMATION HAS BEEN PENETRATED BY A CASED WELL BORE AND IN WHICH THE MUD FLUID IS RETAINED, COMPRISING THE FOLLOWING STEPS CARRIED OUT ONE AFTER ANOTHER IN CLOSE TIMED SEQUENCE SO AS TO CONSTITUTE ONE SINGLE OVERALL OPERATION, LOWERING A PERFORATING GUN INTO THE MUD FLUID IN THE WELL ATTACHED TO THE LOWER END OF A STRING OF TUBING TO A POSITION IN REGISTRY WITH THE SELECTED PRODUCTION FORMATION, THE STRING OF TUBING HAVING A FLUID PASSAGE COMMUNICATING BETWEEN THE INTERIOR OF THE STRING AND THE CASED BORE AT A POINT ABOVE AND ADJACENT THE GUN, INTRODUCING OIL DOWNWARDLY THROUGH THE TUBING, OUTWARDLY THROUGH THE PASSAGE INTO CONTACT WITH THE MUD FLUID AND UPWARDLY THROUGH THE SPACE BETWEEN THE TUBING AND CASING TO REPLACE THE MUD FLUID WITH OIL, CLOSING THE SPACE BETWEEN THE TUBING AND THE CASING AT THE SURFACE AFTER THE WELL BORE HAS BEEN CLEANSED OF MUD FLUID, THEREAFTER FIRING THE PEROFRATING GUN TO PERFORATE THE CASING AND THE SURROUNDING PRODUCTION FORMATION, WHILE THE TUBING IS OPEN AT THE TOP OF THE WELL, AND THEN REGULATING THE FLOW OF FORMATION FLUID FROM THE PRODUCTION FORMATION THROUGH THE PASSAGE IN THE TUBING AND UPWARDLY THROUGH THE TUBING TO THE SURFACE BY PARTIALLY CLOSING THE TUBING AT THE SURFACE.

Claim 2

THE METHOD OF COMPLETING AN OIL WELL WHEREIN A SELECTED PRODUCTION FORMATION HAS BEEN PENETRATED BY A CASED WELL BORE AND IN WHICH THE MUD FLUID IS RETAINED, COMPRISING THE FOLLOWING STEPS CARRIED OUT ONE AFTER ANOTHER IN CLOSE TIMED SEQUENCE SO AS TO CONSTITUTE ONE SINGLE OVERALL OPERATION, LOWERING A PERFORATING GUN INTO THE MUD FLUID IN THE WELL ATTACHED TO THE LOWER END OF A STRING OF TUBING TO A POSITION IN REGISTRY WITH THE SELECTED PRODUCTION FORMATION, THE STRING OF TUBING HAVING A FLUID PASSAGE COMMUNICATING BETWEEN THE INTERIOR OF THE STRING AND THE CASED BORE AT A POINT ABOVE AND ADJACENT THE GUN, INTRODUCING OIL DOWNWARDLY THROUGH THE TUBING, OUTWARDLY THROUGH THE PASSAGE INTO CONTACT WITH THE MUD FLUID AND UPWARDLY THROUGH THE SPACE BETWEEN THE TUBING AND CASING TO REPLACE THE MUD FLUID WITH OIL, CLOSING THE SPACE BETWEEN THE TUBING AND THE CASING AT THE SURFACE AFTER THE WELL BORE HAS BEEN CLEANSED OF MUD FLUID, THEREAFTER FIRING THE PEROFRATING GUN TO PERFORATE THE CASING AND THE SURROUNDING PRODUCTION FORMATION, WHILE THE TUBING IS OPEN AT THE TOP OF THE WELL, AND THEN REGULATING THE FLOW OF FORMATION FLUID FROM THE PRODUCTION FORMATION THROUGH THE PASSAGE IN THE TUBING AND UPWARDLY THROUGH THE TUBING TO THE SURFACE BY PARTIALLY CLOSING THE TUBING AT THE SURFACE.