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FORMATION EVALUATION IN MATURE FIELDS CAN BRING MANY CHALLENGES COMPARED TO EVALUATING NEW DISCOVERIES. THESE INCLUDE ANALYZING LOG DATA OF VARYING VINTAGES WHERE ENVIRONMENTAL EFFECTS, LOWER VERTICAL RESOLUTION AND SHALLOWER DEPTH OF INVESTIGATION HAVE A GREATER IMPACT ON THE DATA THAN WITH MODERN LOGS. IF NEW WELLS ARE DRILLED AND LOGGED WITH MODERN SENSORS THAT ARE LESS AFFECTED BY ENVIRONMENTAL EFFECTS, THIS CAN BE OFFSET BY THE UNCERTAINTY FROM THE CHANGES IN FLUID PROPERTIES OF FORMATION WATER AND HYDROCARBONS DUE TO PRESSURE DEPLETION, WATER FLOODING AND/OR GAS INJECTION. IF NO NEW WELLS ARE DRILLED, CASED HOLE LOGGING CAN BE USED ON EXISTING WELLS TO RE-EVALUATE THE REMAINING OIL IN PLACE, BUT THIS CAN BRING ADDITIONAL INTERPRETATION CHALLENGES DUE TO CEMENT QUALITY ISSUES, PERFORATIONS, DOWNHOLE COMPLETION HARDWARE AND VARYING WELL-BORE FLUIDS. EVEN WITH THESE CHALLENGES, THERE ARE MANY OPPORTUNITIES FOR ENHANCED OIL RECOVERY IN MATURE FIELDS THAT JUSTIFY EITHER CASED LOGGING ON OLDER WELLS OR DRILLING NEW WELLS TO EVALUATE THE REMAINING OIL IN PLACE. EVALUATING THE DATA FROM EITHER SCENARIO CAN BE FACILITATED WITH RECENT ADVANCEMENTS IN ARTIFICIAL INTELLIGENCE AND TOOL RESPONSE MODELING FOR THE EXPECTED DOWNHOLE WELL-BORE CONDITIONS AND FORMATION FLUIDS FOR BOTH OPEN-HOLE AND CASED HOLE LOGGING AND SHOULD PROVIDE MORE ACCURATE ANALYSIS FOR MATURE FIELD DEVELOPMENT PLANNING. |
