Dual zone pumping apparatus

Claim 1

DUAL ZONE PUMPING APPARATUS FOR INSTALLATION WITHING CASINGS OF OIL WELLS, COMPRISING: A LANDING HEAD HAVING A SMALLER EXTERNAL DIAMETER THAN THE INTERNAL DIAMETER OF SAID WELL CASING, SAID LANDING HEAD COMPRISING A CROSSOVER BODY HAVING A PAIR OF LONGITUDINALLY EXTENDING PARALLEL PASSAGES THERETHROUG, ONE OF SAID PASSAGES BEING OF LARGER DIAMETER THAN THE OTHER; A PRIMARY STRING SECURED TO THE CROSSOVER BODY IN ALIGNMENT WITH THE LARGER PASSAGE THROUGH SAID BODY; A TUBULAR MEMBER SECURED TO THE LOWER END OF THE BODY IN ALIGNMENT WITH SAID LARGER PASSAGE AND HAVING AN ANNULAR INTERNAL FLANGE ADJACENT THE UPPER END AND AN INTERNAL ANNULAR FLANGE IN DOWNWARDLY SPACED RELATION THEREWITH, SAID TUBULAR MEMBER EXTENDING DOWNWARDLY TO THE LOWER ZONE; A PACKER IN SAID CASING SEPARATING THE UPPER AND LOWER ZONES AND HAVING AN OPENING THROUGH WHICH SAID TUBULAR MEMBER EXTENDS; AN UPPER PUMP CYLINDER HAVING A DEPENDING TUBULAR EXTENSION WITH A WALL AT THE LOWER END THEREOF, SAID WALL HAVING AN AXIAL BORE THERETHROUGH; A PLURALITY OF ANNULARLY SPACED RELEASABLE LATCHING FINGERS SECURED TO THE LOWER END OF SAID EXTENSION, THE FREE ENDS OF SAID FINGERS RELEASABLY ENGAGING THE LOWER INTERNAL EDGE OF THE UPPER FLANGE OF SAID TUBULAR MEMBER; A LOWER PUMP PISTON HAVING A DEPENDING TUBULAR PISTON ROD; AN ANNULAR EXTERNAL FLANGE AT THE LOWER END OF SAID ROD; HAVING A PLURALITY OF ANNULARLY SPACED DEPENDING ING LATCHING FINGERS RELEASABLY ENGAGING THE LOWER INTERNAL ANNULAR FLANGE IN SAID TUBULAR MEMBER, SAID PISTON ROD AND PPISTON HAVING A LONGITUDINALLY EXTENDING PASSAGE THERETHROUGH; A STANDING VALVE AT THE UPPER END OF SSAID BORE OF THE PISTON, SAID VALVE PERMITTING UPWARD FLOW OF FLUID BUT PREVENTING REVERSE FLOW THROUGH THE PASSAGE IN THE PISTON; AN UPPER PUMP PISTON IN SAID UPPER PUMP CYLINDER, SAID UPPER PUMP PISTON HAVING A LONGITUDINAL PASSAGE THERETHROUGH; A CHECK VALVE CONTROLLING SADID PASSAGE PERMITTING UPWARD FLOW OF FLUID THROUGH SAID PASSAGE AND PREVENTING REVERSE FLOW THERETHROUGH; A PUMP ROD CONNECTED TO THE UPPER END OF SAID UPPER PUMP PISTON AND ADAPTED TO BE OPERABLY CONNECTED TO PUMPING MECHANSIM AT THE SURFACE; A PUMP ROD CONNECTED TO THE LOER END OF SAID PISTON AND EXTENDING DOWNWARDLY THROUGH SAID EXTENSION AND BORE THROUGH THE LOWER WALL THEREOF; A LOWER PUMP CYLINDER OPERABLY RECEIVING THE LOWER PUMP PISTON,THE UPPER END OF SAID CYLINDER HEING CONNECTED TO THE LOWER END OF THE SECOND MENTIONED PUMP ROD, SAID CYLINDER HAVING A WALL CLOSING THE UPPER END THEREOF AND HAVING AN OUTLET PORT THEREIN; A VALVE CONTROLLING SAID OUTLET PORT PERMITTING UPWARD FLOW OF FLUID THERETHROUGH BUT PREVENTING REVERSE FLOW; A CYLINDRICAL FLANGE CARRIED BY THE SECONE MENTIONED PUMP ROD IN DOWNWARDLY SPACED RELATION TO THE LATCH MEANS AT THE LOWER END OF THE EXTENSION OF THE UPPER PUMP CYLINDER AND ADAPTED TO DISENGAGE THE FINGERS THEREOF FROM THE FLANGE AT THE UPPER END OF THE TUBULAR MEMBER WHEN THE PUM ROD IS MOVED UPWRDLY TO A PREDETERMINE POINT TO EFFECT RELEASE OF SAID FINGERS; AN LANDING SPEAR DISPOSED IN THE SMALLER PASSAGE THROUGH THE LANDING HEAD, SAID SPEAR HAVING A FLANGE AT THE UPPER END SEATING ON THE UPPER END OF SAID LANDING HEAD AND A STRAINER AT THE LOWER END BELOW THE LANDING HEAD AND HAVING AN EXTERNAL ANNULAR GROOVE AT THE UPPER END OF SAID STRAINER; A LOCKING SLEEVE SECURED TO THE CROSSOVER BODY IN ALIGNMENT WITH THE SMALLER PASSAGE THERETHROUG; FLEXIBLE LATCHING FINGERS AT THE LOWER END OF SAID SLEEVE SAID LATCHING FINGERS BEING ANNULARLY SPACED APART AND RELEASABLY RECEIVED IN THE ANNULAR GROOVE AT THE UPPER END OF THE STRAINER TO THEREBY RELEASABLY LOCK THE LANDING SPEAR IN SAID SMALLER PASSAGE; SAID LANDING SPEAR HAVING A PASSAGE EXTENDING UPWARDLY THEREIN AND CLOSED AT THE UPPER END; CHECK VALVES CONTROLLING THE FLOW OF FLUID THROUGH THE UPWARDLY EXTENDING PASSAGE OF SAID LANDING SPEAR HAVING A PASSAGE UPWARD FLOW OF FLUID THEREIN BUT PREVENTING REVERSE FLOW, THERE BEING CROSSOVER PASSAGEWAY MEANS BETWEEN THE UPWARDLY EXTENDING PASSAGE IN SAID LANDING SPEAR AND THE INTERIOR OF SAID EXTENSION OF THE UPPER PUMP CYLINDER FOR THE FLOW OF FLUID THERETHROUGH, INTO THE PASSAGE THROUGH THE UPPER PUMP PISTON AND UPWARDLY INTO THE PRIMARY STRING, THERE ALSO BEING A PASSAGE EXTENDING DOWNWARDLY IN THE UPPER END OF SAID LANDING SPEAR AND CLOSED AT ITS LOWER END, SAID CROSSOVER BODY HAVING CROSSOVER PASSAGE MEANS FOR THE FLOW OF OIL FROM THE UPPER END OF THE TUBULAR MEMBER TO THE UPPER END PORTION OF THE LANDING SPEAR WHICH HAS MEANS PROVIDING A CONNECTION FOR THE FLOW OF OIL INTO THE UPPER PASSAGE IN SAID LANDING SPEAR; AND A SECONDARY PARALLEL STRING EXTENDING UPWARDLY FROM THE UPPER END OF THE LANDING SPEAR, SAID SECONDARY STRING HAVING A PASSAGE THERETHROUGH CONNECTED WITH THE PASSAGE IN THE UPPER END OF SAID LANDING SPEAR WHEREBY OIL PUMPED BY THE LOWER ZONE PUMP WILL BE TRANSMITTED TO THE SURFACE INDEPENDENTLY OF THE OIL PUMPED TO THE SURFACE BY THE UPPER ZONE PUMP.