Offshore Carbonate Gas Condensate Reservoir with Early Interference and Multi-Tank Material Balance Application to Analyze Hydraulic Communication with Contiguous Fields Producing Near Critical-Point Fluids

The offshore Naturally Fractured Reservoirs (NFR) from the southeastern coast of Mexico are distinguished by having properties that provide them with great flow capacities, such as a high fracture intensity and dissolution. The geological origin of these types of formations of Jurassic and Cretaceous age is mostly due to high-energy sedimentary environments in facies of oolitic banks and dolomitization processes. As a result of a complete dynamic characterization work that includes the validation of the PVT and adjustment of an equation of state for the type of fluid produced, analysis of classical reservoir engineering (historical pressure-production behavior and declination analysis), diagnosis of water breakthrough, determination of the compressibility of the formation, material balance, advancement of Gas-Water contacts, Pressure Transient Analysis (PTA) and Rate Transient Analysis (RTA), it was possible to identify some findings regarding the peculiar behavior of this type of offshore producing formations in carbonates of Mesozoic age, such as having reached a Recovery Factor greater than 70% due to the properties inherent to the nature of the rock-fluid system, such as the high reservoir pressure that promotes condensate revaporization, fracture porosity and intensity, the slightly water-preferential wettability that led to high condensate recovery, and permeability. Another important element was the early detection of interference (even before starting its exploitation) through hydraulic communication through a regional aquifer with other contiguous marine fields that share the characteristic of producing near critical-point fluids (gas condensates and volatile oils), this phenomenon was identified by the PTA carried out in the first wells, whose recent reinterpretation helped to identify that other contiguous fields shared the same aquifer and proceeded to recalculate the original volume of hydrocarbons through the multi-tank material balance. Another significant contribution was the adequate classification of the type of NFR to which it belongs, the establishment of the optimal number of wells, the remaining reserves to be recovered and the production forecast.