Deconvolution formation pressure as the basis of the modern pressure survey program reducing production deferment

Introduction. Energy distribution at a hydrocarbon pay is a very important part of reservoir development analysis with a strong impact on production performance. Estimating formation pressure across the field is a highly important routine procedure which is unfortunately very costly due to production deferment during the well shutin for pressure survey.

Goal. To provide the methodology and case study of the estimation of formation pressure based on deconvolution of the long-term permanent downhole pressure monitoring and its correlation with the offset wells production history.

Materials and methods. The formation pressure estimation is based on a multi-well pressure-rate relationship for a given group of wells. The pressure-rate model is based on convolution of pressure transient self-response and pressure transient cross-well responses with rate histories. The pressure transient responses are deconvolved for the historical records of permanent downhole pressure gauges. Deconvolution formation pressure is a self-validated methodology, which means it can check is own accuracy during well production. The moment a bottom-hole pressure from convolution pressure-rate model prediction starts deviates from historical records substantially one should repeat the deconvolution process form this historical moment onwards and provide the new set of model parameters for the rest of the production history.

Results. The technology has been developed for reservoir pressure evaluation using multi-well deconvolution without actual well shut-ins.

Conclusion. Deconvolutional formation pressure, as the basis of modern reservoir surveillance programs, allows operators to reduce costs by providing an opportunity to predict the value of reservoir pressure in real time without production deferment.

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