FOAM ACID FRACTURE AS AN ALTERNATIVE TO STANDARD FRACKING AND LIQUID-LESS METHODS OF ROCKS LIQUIDATION

Abstract

The article discusses the issue of the resource potential of tight terrigenous gas-saturated reservoirs, which lie at significant depths within the central part of the Dnipro-Donetsk oil and gas-bearing region, and ways to solve problems related to the methods of development of these deposits, since they are non-convective and cannot be extracted by the classical method. Within the scope of this issue, the article considers the method of hydraulic fracturing as one of the most effective ways of causing the inflow of hydrocarbons from the productive horizon and intensifying the development of hard-to-extract deposits. An overview of fracturing substances used for the process of densification of rocks, in particular, liquids based on water, hydrocarbon, acid bases, liquid-free methods and foam systems, was performed. The compositions of the reagents, the features of their use, and their main disadvantages are listed. Examples of world experience in the use of well-known fracturing fluids and fluid-free methods of reservoir densification are given.In this work, attention is focused on increasing the permeability of rocks through the use of foam acid systems, since, as experience shows, they are highly effective in conditions of tightand heterogeneous reservoirs due to their selectivity, they can be adapted to rocks of various lithological and mineralogical composition and a wide range thermo-baric conditions, they have satisfactory transport properties and the ability to cause self-cleaning of the well.The main reasons for popularizing the use of methods of loosening rocks with a minimum liquid content in the composition of explosive substances for unconventional gas deposits of Ukraine are highlighted. It is recommended to carry out work on the creation of more effective, ecological and economically profitable new or improvement of existing disintegrants, especially foam systems.