Optimum placement of in-fill wells in mature fields requires reliable information about reservoir properties, fluid property distribution and the pressure support of aquifer. In this paper the use of production data is examined as a means of identifying sweet spots for infill directional or extended reach wells. In particular, our focus is the use of production data for fractured reservoirs producing from the Monterey Formation. The emphasis has been mapping of reservoir compartments. Using more than 35 years of historical data on the performance of a number of fields, we have completed a study on the sensitivity of well performance to the size and permeability of compartments, support of aquifer and the matrix or microfractures. This approach can help in identifying cluster of wells with similar compartmental features leading to identification of sub-seismic faults and high productivity compartments and can help in designing the incidence angle of the trajectories of new extended reach and directional wells to intersect compartments with high density fracture swarms.

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