Determination of borehole injection profiles

Claim 1

A METHOD FOR DETERMINING THE INJECTION PORFILE OF A WELL BORE THROUGH WHICH INJECTION FLUIDS ARE PASSED INTO PERMEABLE UNDERGROUND. STRATA PENETRATED THEREBY WHICH COMPRISES DETERMINING THE GEOTHERMAL TEMPERATURE GRADIENT THROUGH THE PERMEABLE INTERVAL, DETERMINING THE INJECTION TEMPERATURE GRADIENT WITHIN THE WELL BORE WHILE CONTINUING THE FLUID INJECTION, SHUTTING IN THE WELL FOR A PERIOD OF AT LEAST 10 HOURS TO TERMINATE ALL FLUID FLOW THEREIN, NEXT DETERMINING AT LEAST ONE SHUT-IN TEPERATURE GRADIENT WITHIN SAID BORE IN THE ABSENCE OF FLUID FLOW; SAID INJECTION AND SHUT-IN GRADIENTS BEING SEPARATELY DETERMINED BY THE STEPS OF LOWERING A TEMPERATURE SENSITIVE DEVICE THROUGH THE WELL BORE TO A POINT ADJACENT THE PERMEABLE INTERVAL, SUSPENDING IT AT SAID POINT FOR AT LEAST 10 MINUTES TO ATTAIN THERMAL EQUILIBRIUM, THEN POSITIONING THE DEVICE SUCCESSIVELY AT A PLURALITY OF POINTS SEPARATED BY INCREMENTAL DEPTH DIFFERENCES OPPOSITE THE PREMEABLE INTERVAL PENETRATED BY SAID WELL BORE, RECORDING THE TEMPERATURE INDICATED AT EACH SUCCESSIVE DEPTH POINT AFTER HOLDING SAID DEVICE STATIONARY FOR AT LEAST 3 MINUTES AT EACH OF SAID POINTS, SAND CONTINUING THE INJECTION FLUID FLOW INTO SAID WELL BORE; SAID INJECTION TEMPERATURE GRADIENTS HAVING ANOMALOUS REGIONS OF CONSTANT TEMPERATURE AND SAID SHUT-IN GRADIENTS HAVING ANOMALOUS TEMPERATURE REGIONS THEREON CORRESPONDING TO THE DEPTH OF EACH PERMEABLE STRATUM, THE PRECISE DEPTHS OF THE UPPER AND LOWER LIMITS OF EACH PERMEABLE STRATUM RECEIVING FLUID BEING ESTABLISHED BY THE UPPER AND LOWER LIMITS OF SAID NAOMALOUS CONSTANT TEMPERATURE REGIONS IN SAID INJECTION GRADIENT, THE INCREMENTAL INJECTION RATES Q FOR EACH INCREMENTAL DEPTH DIFFERENCE IN EACH INDIVIDUAL PERMEABLE STRATUM BEING CALCULATED FROM: