Apparatus for actuating a deep well pump

Claim 1

IN AN OIL WELL THE COMBINATION OF A PUMP INCLUDING A PUMP STANDING VALVE, A PUMP BARREL AND A PUMP PLUNGER; A PUMP TUBING STRING HAVING MEANS AT ITS LOWER END FOR EMBODYING THE AFORESAID PUMP WITH SAID STRING SO AS TO CONTROL ADMISSION OF PRODUCTION FLUID TO THE LOWER END OF SAID STRING; A HYDRAULIC JACK INCLUDING A TUBULAR CYLINDER HAVING APERTURED UPPER AND LOWER HEADS AND FITTING LOOSELY INTO SAID STRING, A PISTON SLIDABLY RECIPROCABLE IN SAID CYLINDER, A HOLLOW PISTON ROD CONNECTED TO SAID PISTON AND EXTENDING DOWNWARD AXIALLY THROUGH THE APERTURE IN SAID LOWER HEAD, A PLURALITY OF LEGS HAVING RETRACTED AND EXPANDED POSITIONS, AND AN ANNULAR PACKER UNIT RESPONSIVE TO THE WEIGHT OF SAID JACK WHEN THE LATTER IS SUPPORTED IN SAID TUBING STRING BY SAID LEGS TO FORM AN ANNULAR SEAL BETWEEN SAID JACK AND SAID STRING, SAID STRING HAVING AN ANNULAR INTERNAL RADIAL RECESS FOR RECEIVING SAID LEGS WHEN THE LATTER EXPAND; A RING SURROUNDING SAID HOLLOW ROD BEHIND LOWER ENDS OF SAID LEGS; SHEAR SCREW MEANS SECURING SAID LEGS TO SAID RING TO TEMPORARILY RETAIN SAID LEGS RETRACTED; SPRING MEANS FOR EXPANDING SAID LEGS WHEN THE LATTER ARE FREE FROM RESTRAINT; A SHEAR COLLAR EMBODIED WITH SAID HOLLOW ROD SO AS TO ENGAGE SAID RING WHEN SAID PISTON IS NEAR THE END OF ITS UPSTROKE IN SAID CYLINDER, SAID PUMP PLUNGER BEING CONNECTED WITH THE LOWER END OF SAID HOLLOW PISTON ROD; A PRODUCTION FLUID PIPE OF RELATIVELY SMALL DIAMETER EXTENDING DOWNWARDLY IN SAID PUMP TUBING STRING TO ATTACH TO SAID UPPER CYLINDER HEAD AND CONNECT WITH THE APERTURE THEREIN, SAID PIPE SUPPORTING SAID JACK DURING THE INSTALLATION AND WITHDRAWAL OF SAID JACK, THE FURTHER LOWERING OF SAID JACK AFTER SAID PLUNGER COMES TO REST AT THE LOWER END OF SAID PUMP TUBING STRING CAUSING SHEARING OF SAID SHEAR SCREW MEANS BY SAID COLLAR ENGAGING SAID RING, THEREBY RELEASING SAID LEGS FOR USE IN SUPPORTING SAID JACK BY SAID LEGS EXPANDING INTO SAID RECESS AS SAID