«Oilfield engineering»

Use of modified displacement and flooding characteristics to evaluate introduced and accumulated water volumes in a deposit and initial oil reserves

UDC: 622.276.2.004.13
DOI: 10.33285/0207-2351-2022-4(640)-5-17

Authors:

¹ Gazprom VNIIGAZ, Razvilka poselok, Moscow region, Russia

Keywords: standard and modified water displacement characteristics, accumulated volumes of water intruded into the reservoir and remaining in it, modified water-flooding characteristic, current oil saturation and oil reserves covered by displacement

Annotation:

Based on the modified displacement characteristics (MDC) and flooding (MCF) based on the Buckley – Leverett model and the material balance equation, the article proposes methods for calculating the accumulated volumes of intruded Q_{in_wt} and water W remaining in the deposit, as well as oil reserves Q_{n initial}, a certain proportion of which is classified as mobile Q_{n movable} in the implemented system of deposit development. Methods for estimating the value of Q_{n movable} are based on the MDC R_l(Q_l), and Q_{l initial} – on the MHF R_f(Q_{in wt}). Theoretical calculations are confirmed by actual data obtained during the operation of a number of production wells and one of the deposits in the whole of field N. The relationship and some features of the behavior of the modified displacement and flooding characteristics are established, which make it possible to improve the accuracy of the predictive indicators of the deposits development in the late and final stages of their operation.

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