ABSTRACT

This paper describes the application of Integrated Production System Modelling (IPSM) at Kashagan field. The IPSM is used for short-term, mid-term production plan and business plan forecasting, opportunity identification/validation and production optimization.

The IPSM modeling strategy is to build fit-for-purpose model which produces accurate results with minimal running time. IPSM enables integration of surface network (GAP) and reservoir simulator through Resolve by Petroleum Experts. This in turn helps to replicate actual field performance by incorporating field management logic (script) and modeling relevant system constraints. While there are many constraints governing the maximum production in Kashagan field, they can be summarized into two main constraints: injection capacity and sulphur processing capacity. Modeling of the latter is essential to consider the impact of composition change over time.

As a result of continuous improvement of existing model and close collaboration with multiple teams, IPSM model has proven its prediction capability with forecast accuracy of 99%. Current IPSM model is able to produce results for various streams: oil & gas production, gas injection, Sulphur throughput, etc.

Additionally, IPSM demonstrated its importance in identification and evaluation of various production opportunities / threats as well as its need in influencing management decisions. After calibration of pipeline network to match actual data, a substantial potential opportunity of optimizing existing wells capacity was revealed. This is vital not only for short-term production optimization needs but also for long-term predictions.

This paper presents several case studies and examples of application and value of Integrated Production System Model in the field. Learnings during implementation of a given feature are also described. Provided examples can be useful for other engineers practicing Integrated Production Model suite.

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