Enhanced Oil Recovery on the Basis of Invert-Emulsion Solution with Simultaneous Use of Acid Composition

摘要

Scope: Oil fields in the late stage of development are basically characterized by high rate water flooding of the formed products. The reason is the breakthrough of water from the reservoir pressure maintenance system by highly permeable interlayers of the layer. Our experiments showed that the usage of certain amount of invert emulsion solution (IES) decreases the water cut significantly and increases the oil recovery almost twice. Processes: Considerable advantage of IES in comparison with solutions which are carrying out the same functions is its ability to disolve at interaction with a hydrocarbonic phase, therefore, application of IES as the blocking solution will allow to decrease a colmatation of oil zones and selectively will isolate only waterbearing interlayer. Special type of acid dissolves the carbonate component of the reservoir, increases the permeability of oil saturated interlayers and expand the drainage process significantly that results twice higher volume of oil extraction from the same bed. Results - Special IES solves the problem that exists in case of water flooding using polymers; - Special acid composition contains a number of surfactants, water repellents and corrosion inhibitors. - the effectiveness of technology of intensification of oil is confirmed within the field trial on Pashninsky oilfield in 2014