Apparatus for the drilling of and the protection of drill cores in deep-welldrilling operations

Claim 1

A CORE DRILLING APPARATUS FOR THE DRILLING AND RECOVERY OF CORES FROM DEEP WELL DRILLINGS, A ROTATABLE DRILL TUBE, A PROTECTION TUBE NON-ROTATABLY DISPOSED WITHIN SAID DRILL TUBE AND SPACED THEREFROM AT LEAST IN PART TO PROVIDE A FIRST AXIALLY EXTENDING SPACE, AN AXIALLY DIVIDED CORE TUBE DISPOSED IN SAID PROTECTION TUBE AND SPACED THEREFROM AT LEAST IN PAT TO PROVIDE A SECOND AXIALLY EXTENDING SPACE, THE UPPER END OF SAID CORE TUBE TERMINATING FREELY IN SAID PROTECTION TUBE, MEANS FOR FILLING THE INTERI OF SAID CORE TUBE WITH AN AIR-FRE CORE PROTECTING LIQUID, MEANS FOR SEALING THE UPPER END OF SAID PORTECTION TUBE, A DRILL BIT COINNECTED TO SAID DRILL TUBE FOR ROTATION THEREWITH AND HAVING AN AXIALLY EXTENDING BORE FORMED THEREIN, CUTTING MEANS FORMED ON SAID DRILL BIT, A CORE-CATCHING HOUSING RELEASABLY CONNECTED TO THE LOWER END OF SAID PROTECTION TUBE IN FIXED ANGULAR RELATIONSHIP THEREWITH AND EXTENDING INTO SAID AXIALLY EXTENDING BORE IN SAID DRILL BIT IN SPACED RELATIONSHIP THEREWITH AT LEAST IN PART TO PROVIDE A THIRD AXIALLY EXTENDING SPACE IN FLUID FLOW COMMUNICATION WITH SAID FIRST AXIALLY EXTENDING SPACE, SEALING MEANS POSITIONED BETWEE SAID CORE-CATCHING HOUSING AND SAID DRILL BIT BELOW SAID THIRD AXIALLY EXTENDING SPACE TO PROVIDE A SUBSTANTIALLY FLUID-TIGHT SEAL THEREBETWEEN, WHILE ENABLING FREE ROTATION OF SAID DRILL BIT RELATIVE TO SAID CORE-CATCHING HOUSING, ANNULAR CHANNEL MEANS FORMED BETWEEN SAID CORE-CATCHING HOUSING AND SAID DRILL BIT BELOW SAID SEALING MEANS AND THERE BEING MEANS PREVENTING FLUID COMMUNICATION BETWEEN SAID TUBULAR CHANNEL MEANS AND SAID THIRD AXIALLY EXTENDING SPACE, RADIALLY EXTENDING THIRD FLOW BORES FORMINED IN SAID DRILL BIT AND EXTENDING THIRD FLOW BORES FORMED IN SAID DRILL MEANS IN FLUID FLOW COMMUNICATION WITH BOTH SAID ANNULAR CHANNEL MEANS AND THE EXTERIOR OF SAID CORE DRILLING APPARTUS, MEANS MAINTAINING SAID CORE TUBE IN FIXED ANGULAR RELATION TO SAID CORE-CATCHING HOUSING, A PLURALTIY OF AXIALLY EXTENDING FLUID FLOW BORES FORMED IN SAID CORE-CATCHING HOUSING AND EXTENDING THERETHROUGH IN FLUID FLOW COMMUNICATION WITH BOTH SAID ANNULAR CHANNEL AND SAID SECOND AXIALLY EXTENDING SPACE, A PLURALITY OF FLUID NOZZLES EXTENDING IN SAID RILL BIT FROM SAID THIRD AXIALLY EXTENDING SPACE TO THE EXTERIOR OF SAID CORE DRILLING APPARATUS BELOW SAID RADIALLY EXTENDING BORES,