REGULATION OF FILTRATION CHARACTERISTICS OF HIGHLY WATERED TERRIGENOUS FORMATIONS USing COMPLEX CHEMICAL COMPOSITIONS BASED ON SURFACTANTS
A significant share of Russian oil fields has entered the final stage of development and is characterized by a drop
in production. It comes true due to the depletion of active oil reserves, and, as a consequence, an increase in the
proportion of residual oil trapped in areas which are not covered by flooding, and physically or chemically associated
with the formation of oil. An additional factor is the increase in the water content of complex-structured terrigenous
reservoirs and their high number of permeable intervals.
Development of the considered productive formations is carried out, as a rule, with maintenance of reservoir pressure
by means of "cold" flooding. Despite the development and relatively low cost, it has its limitations/restrictions. The
main reasons why we are not able to achieve complete displacement of oil by "cold" water are the difference between
the viscosity of oil and the displacing agent, their immiscibility and hydrophobization of reservoir rocks .
All methods of enhanced oil recovery (EOR) used for highly watered oil fields with hard-to-recover reserves are
aimed at additional recovery of residual oil and achieving the design oil recovery factor (ORF), by optimizing the
flooding system and upgrading the flooding agents.
The design ORF can be achieved by increasing the water flood displacement efficiency, by improving the washing
capacity of water (displacement agent), or by increasing the sweep efficiency of the reservoir flooding.
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