Features of application of proppant-acid fracturing technology o in the fields of the Republic of Bashkortostan

UDK: 622.276.66СГ
DOI: 10.24887/0028-2448-2018-12-120-122
Key words: The Republic of Bashkortostan, carbonate formations, stimulation technologies, proppant-acid fracturing
Authors: V.A. Grishchenko (RN-BashNIPIneft LLC, RF, Ufa), I.R. Bashirov (Bashneft-Dobycha» LLC, RF, Ufa), M.R. Mukhametshin (Bashneft-Dobycha» LLC, RF, Ufa), V.F. Bildanov (RN-CEPiTR LLC, RF, Tyumen)

The article is devoted to the issue of increasing the efficiency of carbonate reservoirs development by improving stimulation technologies. Acid hydraulic fracturing is used in carbonate formations to make high conductive channels and join natural fractures network. Complex geological structure leads to the low efficiency of the use of acid compounds, which leads to a reduction of coherence of the system of fractures network and deterioration of production of wells. One of the ways to improve the efficiency of reservoir stimulation in these conditions is the use of technology of proppant-acid fracturing, which combines the advantages of both acid and proppant hydraulic fracturing. It allows to increase the coverage of carbonate deposits with increased heterogeneity by acid exposure, as well as to maintain opening of fractures during exploitation. The paper presents the results of the use of this type of hydraulic fracturing in the fields of the Republic of Bashkortostan: describes the basics of technology, the experience of its implementation and the process of evolution, the analysis of efficiency. On the basis of the analysis the authors determined the most effective conditions for the use of technology of proppant-acid fracturing for the fields of the region. The key conditions are to ensure the flow of fluid from the reservoir to the fixed fracture, as well as the presence of increased heterogeneity in the volume of the field. The first condition is met for medium and high permeability reservoirs developed with reservoir pressure maintenance system. The second is caused by the low coverage of acid composition of objects with the presence of interbedded insoluble rocks, natural channels of high conductivity. The revealed field of application allows to determine the optimal method of impact on the rock for each object, taking into account its geological and physical characteristics and the current state of development.


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