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PEMEX—the national oil company of Mexico—had been using a combination of single reservoir simulation models and material-balance equations for production forecasting for its Veracruz asset. However, these solutions could not account for all subsurface and surface element interaction, especially with several reservoirs of differing geological and dynamic characteristics simultaneously producing through the same surface facilities. Therefore, the uncertainty on early water breakthrough, liquid loading, and timing to initiate the compression phase was still high.
PEMEX met with Schlumberger to discuss these issues and design a new exploitation strategy for four dry-gas reservoirs. The new strategy would need to provide an optimum exploitation plan for the next decade, determining the best production rate per reservoir and well. This was necessary to ensure that a planned compression stage benefited the four reservoirs, as well as take into account all interaction among surface and subsurface production system elements. PEMEX also wanted to define individual well productivity and understand which wells presented a high-water production-rate risk.
The team built reservoir models using the ECLIPSE industry reference reservoir simulator and history matched them to recent production information. The various well and network models were then created using PIPESIM production system analysis software. Merak Peep economic evaluation software was used for fiscal modeling and forecasting.
Schlumberger and PEMEX designed and evaluated multiple exploitation plans using the Avocet production operations software platform to integrate reservoir, well, and network simulation models. The team was able to solve models simultaneously at every time step, allowing for boundary conditions downstream and upstream through the entire simulation. This allowed PEMEX to apply global production constraints to the integrated system.
The new integrated system allowed the team to generate several possible exploitation plans for the next 10 years. All scenarios were evaluated taking into account various technical and economic parameters to help select an optimum strategy. Cumulative production versus net present value was established to determine which scenarios would be most competitive. In all scenarios, the compression equipment rental option was found to be best—with production gains of over 30% forecast.
The Avocet platform allowed PEMEX to unite data with models in a single environment, identify problems more quickly, minimize downtime, and optimize production.
“By integrating critical information with data in one platform we have optimized our production.”—Jose Ramon Ramirez Cuacenetl Leader, Reservoir Engineering Gas Group PEMEX AIV
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“The Avocet platform allowed us to integrate models from ECLIPSE, PIPESIM, and Merak Peep software to deliver an up-to-date picture of our operations.”
Francisco Martinez Mendoza, Exploitation Design Coordinator