Сharacteristic properties of the terrigenous reservoir development with underlying water by horizontal wells

Abstract

The paper considers the issues of the development of Bobrikovsko-Radaevsky and Tula formations among the Arlansky and Yugomashevsky oilfields, which are classic examples of the development of terrigenous reservoir. The analysis of the operational parameters was carried out for horizontal wells that were drilled into the terrigenous part of the Lower Carboniferous formations. There is a problem of premature flooding of the wells, which has low specific production rate of recoverable reserves. The displacement characteristics are similar to the typical displacement characteristics for a reservoir with an active aquifer based on analogy analysis. According to the results of the calculations performed, it was revealed that the time to achieve critical water cut is affected by the volume of oil equal to the volume of the half-cylinder figure with a radius equal to the distance between the wellbore tracing and the position of the oil-water contact, as well as the fluid rate. Achieving ater cut for wells with active bottom waters is a natural process of formation development within the downhole zone volume. The influence of downhole pressure on displacement characteristics for wells from different groups was studied. Wells were grouped according to the liquid rate, and it was shown that the displacement characteristics are improving for a group of wells with increasing liquid rate. Keywords: terrigenous reservoir; oil; oilfield; horizontal well; water cut; fluid flow rate; forced extraction; bottom water; displacement characteristics.