Drilling turbine

Claim 1

IN A DRILLING TURBINE UTILIZABLE SELECTIVELY AS A HYDRAULIC JET PERFORATOR AND INCLUDING A TUBULAR TURBINE BODY, A SHAFT, BEARING MEANS SUPPORTING SAID SHAFT WITHIN SAID BODY FOR A ROTATABLE AND LIMITED AXIAL MOVEMENT RELATIVE THERETO, BLADE SETS WITHIN SAID BODY FOR DRIVING THE SHAFT AND OPERABLY RESPONSIVE TO FLOW OF A CIRCULATING FLUID THROUGH SAID SETS, A TOOL FITTED AT THE LOWER END OF SAID SHAFT, THE INLET OF THE FLUID BEING ADJACENT THE UPPER END OF THE TURBINE WHILE ITS OUTLET IS ADJACENT ITS LOWER END, A FIRST FLUID CIRCUIT DEFINED BY SAID BODY AND SHAFT PROVIDING COMMUNICATION BETWEEN SAID UPPER END AND SAID LOWER END THROUGH THE BLADE SETS OF THE TURBINE, AND A SECOND FLUID CIRCUIT INCLUDING A BORE DEFINED WITHIN SAID SHAFT PROVIDING DIRECT COMMUNICATION BETWEEN SAID UPPER AND LOWER ENDS OF THE TURBINE; THE COMBINATION OF FIRST AND THIRD VALVE MEMBERS FIXED ON THE TURBINE BODY, AND SECOND AND FOURTH VALVE MEMBERS FIXED UPON SAID SHAFT, SAID FIRST VALVE MEMBER BEING ENGAGEABLE WITH SAID SECOND VALVE MEMBER AS THE SHAFT MOVES AXIALLY UPWARDLY WITH RESPECT TO SAID BODY WHILE SAID THIRD AND FOURTH VALVE MEMBERS SEPARATE SO AS TO OPEN SAID FIRST FLUID CIRCUIT AND TO CLOSE SAID SECOND FLUID CIRCUIT, WHILE SAID THIRD VALVE MEMBER IS ENGAGEABLE WITH SAID FOURTH VALVE MEMBER WHEN THE SHAFT MOVES AXIALLY DOWNWARDLY WITH RESPECT TO THE BODY AND SAID FIRST AND SECOND VALVE MEMBERS SEPARATE SO AS TO CLOSE THE FIRST FLUID CIRCUIT AND TO OPEN THE SECOND FLUID CIRCUIT.