Apparatus for penetrating and hydraulically eracturing well formations

Claim 1

APPARATUS FOR DEVELOPING PASSAGES FOR LIQUID THROUGH AN UNDERGROUND FORMATION ADJACENT A WELL BORE COMPRISING, A TUBING EXTENDING IN THE WELL BORE AND CASING TO A PRODUCING FORMATION, MEANS IN THE WELL BORE SEALINGLY ENGAGING THE TUBING, MEANS SUPPORTING THE TUBING IN THE WELL BORE, A JET HEAD ON THE LOWER END OF THE TUBING AND HAVING RADIAL BORES THEREIN, PLATES REMOVABLY MOUNTED IN THE JET HEAD TO CLOSE THE RADIAL BORES THEREIN, SELECTED PLATES HAVING JET ORIFICES EXTENDING THERETHROUGH AT AN ANGLE TO A RADIANT AXIALLY OF THE RESPECTIVE PLATE WHEREBY JETS ISSUING FROM THE JET ORIFICES STRIKE THE SIDE OF THE WELL BORE AT AN ACUTE ANGLE, SAID PLATES BEING MOVABLE IN THE JET HEAD TO ADJUST THE JET ORIFICES WHEREBY THE JETS ISSUING THEREFROM ARE IN THE PLANE OF THE DESIRED CUT, AND MEANS HAVING COMMUNICATION WITH THE TUBING FOR DELIVERING FLUID UNDER PRESSURE TO THE TUBING AND EFFECTIVE DISCHARGE OF SAME THROUGH THE JET ORIFICES FOR CUTTING THE FORMATION.