American Institute of Mining, Metallurgical and Petroleum Engineers Inc.

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Analysing the production mechanism and the energy of a fractured bottom water-drive reservoir a new method of future forecast was developed.

The basic idea was to build a model which takes into consideration the properties of an important number of cores, and dividing them in classes of different permeability. According to reservoir rate, a part of the classes will behave as macrofractures and another as microfractures, and consequently a rate-recovery relationship could be evaluated A model-reservoir relationship was proposed, so that the rate decline of model considered as maximum allowable gravity rate could be correlated with the reservoir registrated rates obtained in gravity-drainage conditions.

Based on this relationship and on trial and error Calculation procedure, the future performance could procedure, the future performance could be conveniently evaluated.


A fracture is constituted by a considerable number of coarses and fine channels in a chaotic intercommunication.

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