Computing circuits

Claim 1

AN OIL RESERVOIR AMALYZER COMPRISING A TERMINAL; A RESISTANCE-CAPACITANCE NETWORK CONSTITUTING AN ELECTRICAL WATER DRIVE ANALOG CONNECTED TO SAID TERMINAL AND PROVIDING CURRENT FLOW THEREAT; MEANS FOR INITIALLY CHARGING SAID NETWORK; AND AN ANALOG CONNECTED TO SAID TERMINAL TO CONTROL FLOW OF CURRENT AT SAID TERMINAL IN ACCORDANCE WITH THE MATERIAL BALANCE EQUATION OF AN OIL RESERVOIR, THE LAST MENTIONED ANALOG COMPRISING: A FIRST GENERATOR, CONTROLLED BY THE POTENTIAL AT SAID TERMINAL, OF A POTENTIAL CORREPONDING TO VOLUME OF OIL AND OF GAS RELEASED FROM SOLUTION; A SECOND GENERATOR, CONTROLLED BY THE POTENTIAL AT SAID TERMINAL, OF A POTENTIAL CORRESPONDING TO VOLUME OF GAS AT RESERVOIR CONDITIONS PER UNIT VOLUME OF GAS AT STANDARD CONDITIONS; A THIRD GENERATOR OF A POTENTIAL CORRESPONDING TO CUMULATIVE VOLUME OF OIL PRODUCED;; A FOURTH GENERATOR OF A POTENTIAL CORRESPONDING TO CUMULATIVE VOLUME OF WATER PRODUCED; A FIFTH GENERATOR, CONTROLLED BY THE POTENTIAL AT SAID TERMINAL, OF A POTENTIAL CORRESPONDING TO THE CUMULATIVE PRODUCED GAS TO OIL RATIO; AND CALCULATING ELEMENTS RELATING SAID POTENTIALS, SAID CALCULATING ELEMENTS COMPRISING: A FIRST MEANS PROVIDING A POTENTIAL CORRESPONDING TO THE ORIGINAL AMOUNT OF OIL IN THE RESERVOIR; A FIRST SUBSTRACTION CIRCUIT HAVING INPUTS FROM SAID FIRST MEANS AND FROM SAID THIRD GENERATOR AND PROVIDING A POTENTIAL CORRESPONDING TO THE DIFFERENCE OF THE FORMER OF ITS INPUTS MINUS THE LATTER; A FIRST MILTIPLICATION CIRCUIT HAVING INPUTS FROM SAID FIRST SUBTRACTION CIRCUIT AND FROM SAID FIRST GENERATOR AND PROVIDING A POTENTIAL CORRESPONDING TO THE PRODUCT OF ITS INPUTS; A SECOND MEANS PROVIDING A CONSTANT POTENTIAL; A SECOND MULTIPLICATION CIRCUIT HAVING INPUTS FROM SAID THIRD GENERATOR AND FROM SAID FIFTH GENERATOR AND PROVIDING A POTENTIAL CORRESPONDING TO THE PRODUCT OF ITS INPUTS; A SECOND SUBSTRACTION CIRCUIT HAVING INPUTS FROM SAID SECOND MEANS AND SAID SECOND MULTIPLICATION CIRCUIT AND PROVIDING A POTENTIAL CORRESPONDING TO THE DIFFERENCE OF THE FORMER OF ITS INPUTS MINUS THE LATTER; A THIRD MULTIPLICATION CIRCUIT HAVING INPUTS FROM SAID SECOND GENERATOR AND FROM SAID SECOND SUBSTRACTION CIRCUIT AND PROVIDING A POTENTIAL CORRESPONDING TO THE PRODUCT OF ITS INPUTS; A FIRST ADDITION CIRCUIT ADDING THE OUTPUTS FROM THE FIRSTST MULTIPLICATION CIRCUIT, FROM THE THIRD MULTIPLICATION CIRCUIT, AND FROM SAID FOURTH GENERATOR, AND PROVIDING A POTENTIAL CORRESPONDING TO THE SUM OF ITS INPUTS; A VARIABLE GAIN AMPLIFER RECEIVING THE OUTPUT FROM SAID FIRST ADDITION CIRCUIT; A SECOND ADDITION CIRCUIT ADDING THE OUTPUT POTENTIAL FROM SAID AMPLIFER AND THE POTENTIAL OF SAID TERMINAL; AND A CAPACITANCE CONNECTED BETWEEN SAID TERMINAL AND THE OUTPUT OF SAID SECOND ADDITION CIRCUIT.