Perforating in wells

Claim 1

APPARATUS FOR PRODUCING CLEAN PERFORATIONS IN A WELL COMPRISING: A HOUSING ADAPTED TO BE LOWERED IN A WELL PIPE AND HAVING A FIRST CHAMBER INITIALLY CONTAINING COMPLETION FLUID AND A SECOND CHAMBER CONTAINING ANOTHER FLUID; AN EXPANSIBLE PACKER ARRANGED ON SAID HOUSING ADAPTED TO CLOSE OFF THE ANNULUS BETWEEN SAID HOUSING AND SAID WELL PIPE WHEN EXPANDED; AN OPEN-ENDED PERFORATOR TOOL CONNECTED TO THE LOWER END OF SAID HOUSING AND HAVING A FLOW PATH THROUGH THE INTERIOR AND BETWEEN THE ENDS THEREOF; SAID HOUSING HAVING A FLOW PATH THROUGH THE INTERIOR THEREOF EXTENDING FROM ABOVE SAID PACKER TO SAID PERFORATOR FLOW PATH AND A FIRST OPENING ABOVE SAID PACKER FLUIDLY COMMUNICATING SAID HOUSING FLOW PATH AND THE INTERIOR OF SAID PIPE; SAID HOUSING HAVING A SECOND OPENING FLUIDLY COMMUNICATING SAID FIRST CHAMBER AND THE INTERIOR OF SAID WELL PIPE TO ALLOW DRILLING FLUID TO FLOW INTO SAID FIRST CHAMBER; A FLOATING PISTON ARRANGED IN SAID FIRST CHAMBER SEPARATING SAID COMPLETION FLUID AND DRILLING FLUID; A FIRST PUMP ARRANGED IN SAID FIRST CHAMBER FOR PUMPING COMPLETION FLUID; A FIRST CONDUIT CONNECTED TO SAID FIRST PUMP AND EXTENDING TO BELOW SAID PACKER ADAPTED TO CONDUCT COMPLETION FLUID PUMPED BY SAID FIRST PUMP TO THE EXTERIOR OF SAID HOUSING BELOW SAID PACKER TO DISPLACE DRILLING FLUID THROUGH SAID FLOW PATHS AND SAID HOUSING FIRST OPENING; A SECOND PUMP ARRANGED IN SAID SECOND CHAMBER FOR PUMPING SAID OTHER FLUID; A SECOND CONDUIT CONNECTED TO SAID SECOND PUMP AND EXTENDING TO THE INTERIOR OF SAID PACKER FOR CONDUCTING SAID OTHER FLUID PUMPED FROM SAID SECOND CHAMBER TO EXPAND SAID PACKER; AND AN ELECTRICAL CONDUCTOR CABLE CONNECTED TO SAID HOUSING FOR SUSPENDING SAID HOUSING IN SAID WELL PIPE AND FOR TRANSMITTING ELECTRICAL ENERGY TO ACTUATE SAID PERFORATOR AND OPERATE BOTH OF SAID PUMPS.