Abstract
The article provides an overview of enhanced oil recovery methods based on the injection of foam systems. In late-stage fields developing, it is necessary to block highly permeable watered formation zones. For this purpose, the use of foaming systems is promising. As a result of blocking high-permeability zones with foam systems, lowpermeability oil-saturated zones are involved in the development. The article considers the foaming mechanism, selection of foam stabilizers, foam migration in the formation. The influence of temperature, mineralization of formation water, the presence of oil on the stability of foam systems are investigated in this review. Experimental studies and field implementation indicate that technologies are very effective. Foam flooding increases the coverage efficiency in heterogeneous reservoirs, thereby increasing the oil recovery ratio. Investigations into this matter are therefore urgent and still ongoing today. Keywords: foaming systems; stability; polymer; nanoparticles; microphotographs; salinity; displacement ratio; formation coverage; self-generating thermal foams; fractured reservoirs.
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