Formation testing apparatus

Claim 1

THE COMBINATION WITH A HOLLOW DRILL BIT IN CONTACT WITH FORMATION TO BE SAMPLED AND HAVING A HOLLOW BARREL PORTION SUPPORTING SAID BIT AT THE END OF THE DRILL STRING, OF A SAMPLING DEVICE RESPONSIVE TO MUD PUMPING PRESSURE ADAPTED FOR LOWERING INTO THE HOLLOW INTERIOR OF SAID BIT AND INCLUDING MEANS ON THE DEVICE ARRANGED TO ENGAGE AN INTERNAL SURFACE OF THE BIT FOR LIMITING DOWNWARD MOVEMENT OF THE DEVICE, AN UPPER CYLINDRICAL PORTION OF THE DEVICE CONTAINING A SAMPLE RESERVOIR, A BODY PORTION CONTAINING A COLLECTION CHAMBER, A PROBE PORTION MOVABLY SUPPORTED BY THE BODY PORTION, MEANS FOR MOVING THE PROBE PORTION IN RESPONSE TO THE MUD PUMPING PRESSURE TO AN EXTENDED POSITION TO PENETRATE THE UNCUT FORMATION BELOW THE BIT, THE PROBE PORTION HAVING AN INTERNAL PASSAGE WITH AN INGRESS OPENING INTO SAID PASSAGE AND A VALVE CONTROLLED OUTLET LEADING TO THE COLLECTION CHAMBER ALLOWING FORMATION FLUIDS TO PASS INTO THE COLLECTION CHAMBER WHEN THE PROBE PORTION IS IN THE EXTENDED POSITION, MEANS FOR DELIVERING THE EXTRACTED FLUIDS FROM THE COLLECTION CHAMBER TO THE RESERVOIR, MEANS FOR SEALING THE TESTING DEVICE FROM ADULTERATED FLUIDS DURING SAMPLING, AND MEANS FOR WITHDRAWING THE PROBE FROM THE PENETRATED FORMATION ON TERMINATION OF THE PUMPING PRESSURE.