The Mongi field is the largest on Sakhalin island, which has been developed since the early 1970s to the present. Production of this field is currently uneven: for example, the oil recovery factor (ORF) in the southern part of the field is on average higher than 0.5, which is associated with a favorable hydrogeological condition. The reverse situation is presented in the northern part of the field, where the average ORF is less than 0.2, which is a consequence of the weak influence of aquifer, significant compaction of rocks and deterioration of the reservoir properties. Complicated development conditions, such as a high degree of development and water-cut, as well as an uneven reduction in reservoir pressure dictate the conditions for the formation of a strategy for additional development of reserves. Detailed study of disjunctive dislocations of the Mongi filed is the main tool for the successful implementation of Wellwork programs and effective development of residual recoverable reserves, since they directly affect the behavior of reservoir pressure. Field data, results of research on production drilling indicate secondary processes occurring in reservoirs during development. The decrease in reservoir properties based on the results of well testing, low starting flow rates, lack of inflow during development, and the results of reservoir simulation confirm the process of rock compaction due to a critical decrease in reservoir pressure. The obtained data were used in forming the strategy for optimization and development of the development system at Mongi field. The authors offer recommendations for improving the efficiency of reservoir pressure maintenance system, substantiate the relevance of hydraulic fracturing, and form the concept of identifying sweet spots in the formation of the production drilling program.
References
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