Method for operative estimation of current reservoir pressure distribution based on the wells normal production data

Abstract

In the article there has been proposed method of operative estimation of the current reservoir pressure distribution from normal well operation data. The method is based on the algorithm including current distribution calculation of function values for potential and filtration velocity in the oilfild selected area. The method allows to monitor the current distribution of the reservoir pressure in the productive formation of the area under consideration, as well as to assess the effectiveness of the impact on the reservoir in order to maintain the reservoir pressure. The implementation of the proposed method, demonstrated on the example of the "Neft Dashlary" (X horizon, block V) oilfield data, showed high accuracy of the obtained calculated values. The average value of the relative error of the calculated values of the reservoir pressure to the actual values of the downhole pressure measurements at the wells is not more than 1%, and the average calculated value of the reservoir pressure in the productive formation in the pilot area coincides with its actual present value. Keywords: reservoir; reservoir pressure; reservoir enhanced oil recovery; zonal impact; productive horizon; well productivity; diagnostics; filtration; monitoring; streamlines.