Technical Paper: Effects of Economic Analysis on Re-Development of a Gas Field - Lessons Learned From a Reservoir Simulation Study

Society: SPE
Paper Number: 163132
Presentation Date: 2012
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The subject gas field is located in the Sulaiman Fold Belt in Pakistan. A realistic 3D static model was constructed for the challenging multiple reservoirs in the field, which included both clastics and carbonates. Four main reservoir horizons were modeled. The reservoir engineering analyses included PVT, well test, static pressure data, and core analysis. The static pressure analysis helped define hydraulic compartmentalization in the field.

WHFP measurements were not available in the desired accuracy and density. A surface network model was used with plant inlet pressure as the primary constraint in order to obtain the required information. Satellite based elevation information was used to establish an accurate model with respect to pressure drop due to liquid hold up in pipelines.

The history match in the field was performed on a zone-by-zone basis. In the absence of a 3D seismic cube, many of the faults in the field could not be interpreted, yet their presence was predicted by a closely matching sandbox model. This was an important clue which led to a useful approach regarding the location of simulation faults distributed in the entire field. An innovative approach was used in order to calibrate the size of sand lenses in one of the zones.

The final step was the forecasting and development of optimal scenario using economic analysis. Many scenarios were tested, and the optimal scenario was identified. Maximum use was made of existing wellbores through recompletion, and new drilling was minimized. Furthermore, the impact of increasing the currently low gas price was tested. It was concluded that doubling of the gas price of the field would increase the NPV 3 times delay abandonment by 6 years.

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