Method and apparatus including capacitor circuit storage means for the delayed recording of borehole measurements

Claim 1

IN THE METHOD OF LOGGING A BOREHOLE WITH A SUBSURFACE TOOL WHICH TRAVERSES THE BOREHOLE AT VARYING SPEEDS, SAID TOOL HAVING A FIRST MEASURING MEANS, AND A SECOND MEASURING MEANS SPACED APART ALONG THE LONGITUDINAL AXIS OF THE BOREHOLE, THE STEPS OF MEASURING A FIRST CHARACTERISTIC OF A FORMATION ADJACENT THE BOREHOLE AT A SELECTED DEPTH LEVEL BY SAID FIRST MEASURING MEANS, DEVELOPING A FIRST SIGNAL PROPORTIONAL TO THE MAGNITUDE OF SAID FIRST CHARACTERISTIC, TRANSMITTING SAID FIRST SIGNAL TO A CONDENSER FOR STORAGE OVER A CIRCUIT HAVING A SMALL TIME CONSTANT, MAKING A MEASUREMENT OF A SECOND CHARACTERISTIC OF THE FORMATION ADJACENT THE BOREHOLE AT SAID SELECTED DEPTH LEVEL BY SAID SECOND MEASURING MEANS SUBSEQUENT TO THE MEASUREMENT OF SAID FIRST CHARACTERTIC, DEVELOPING A SECOND SIGNAL REPRESENTATIVE OF SAID SECOND CHARACTERISTIC, DISCHARGING SAID CONDENSER TO A RECORD MEDIUM OVER A CIRCUIT HAVING A LARGE TIME CONSTANT AFTER A TIME INTERVAL OF A DURATION RELATED TO THE SPEED SAID SUB-SURFACE TOOL IS TRANSVERSING SAID BOREHOLE DURING SAID TIME INTERVAL, AND SIMULTANEOUSLY RECORDING SAID FIRST AND SECOND SIGNALS IN SIDE BY SIDE RELATIONSHIP ON A RECORD MEDIUM AT THE SAME DEPTH REFERENCE ON THE RECORD MEDIUM, SAID DEPTH REFERENCE CORRESPONDING TO THE SELECTED DEPTH LEVEL IN THE BOREHOLE AT WHICH SAID FIRST AND SAID SECOND CHARACTERISTIC MEASUREMENTS ARE OBTAINED, WITH ALL OF SAID STEPS BEING SYNCHRONIZED WITH THE VARYING SPEED OF SAID SUB-SURFACE TOOL AS IT TRAVERSES THE BOREHOLE DURING SAID STEPS.