The results of experimental field trials of the compositions for acid treatment and hydraulic fracturing in conditions Domaniс deposits of the Bavlinskoye field

UDK: 622.276.6

DOI: 10.24887/0028-2448-2020-7-104-108

Key words: Domanic sediments, design, fracturing, low-viscosity fluid, proppant, acid composition, candidate well, relative growth, optimization

Authors: R.S. Khisamov (Tatneft PJSC, RF, Almetyevsk), I.S. Zakirov (Almetyevsk State Oil Institute, RF, Almetyevsk), E.F. Zakharova (Almetyevsk State Oil Institute, RF, Almetyevsk), A.A. Lutfullin (Tatneft PJSC, RF, Almetyevsk), E.M. Abusalimov (Tatneft PJSC, RF, Almetyevsk), R.F. Khusainov (Tatneft PJSC, RF, Almetyevsk), D.V. Bezrukov (Almetyevsk State Oil Institute, RF, Almetyevsk)

Many oil companies have diversified portfolios of assets that consist of highly depleted conventional oil reserves coupled with unconventional oil in Domanic formation. Oil bearing pay zone at the Bavlinskoye field is represented by low-permeability Domanic formation, which is composed of carbonate rocks with interlayers of poorly permeable and enriched organic matter calcareous-siliceous or siliceous-calcareous rocks in the section. The main methods of oil production stimulation from such reservoirs are hydraulic fracturing and injection of compositions based on hydrochloric acid, both allowing to increase the permeability of the reservoir due to the formation of new highly permeable channels (hydraulic fracturing and dominant wormholes). Experimental studies have shown that the structure of these channels is predetermined by the conditions of the reservoir depletion, including the fluid flow properties, temperature, injection rate, as well as the composition and properties of workover fluids. Under the Federal Research Program “Research and Development in Priority Areas for the Development of the Russian Science and Technology for 2014-2020” and pursuant to agreement 14.607.21.0195 Almetyevsk State Oil Institute conducted work on the scope of “Development of scientific and technological solutions for the development of unconventional reservoirs and hard-to-recover oil reserves (bituminous oils) based on experimental studies”, aimed at increasing production by hydraulic fracturing and acid treatment in the wells drilled in Domanic formation. A comprehensive account of factors that significantly influence the effectiveness of workovers (geological and physical parameters of the reservoirs as well as technogenic impact associated with the peculiarities of the reservoir development scenario) enabled us to identify the optimal compositions taking into account the design of hydraulic fracturing and acid treatment during pilot workovers implemented in the wells at Bavlinskoye field. The use of numerical simulators to optimize the process of acid treatment and hydraulic fracturing resulted in economically viable solution due to the screening of different injection volumes, variation in the speed of injection and applied auxiliary ingredients for the developed composition. References 1. Zakirov I.S., Zakharova E.F., Musabirov M.Kh., Ganiev D.I., Approaches to assessing the effectiveness of chemicals on core material of Domanic deposits (In Russ.), Neftyanaya provintsiya, 2019, no. 3(19), pp. 141–155. 2. Khisamov R.S., Zakirov I.S., Zakharova E.F. et al., Experience of studying and development of Domanic deposits on the example of Bavlinskoye field of the Republic of Tatarstan (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2018, no. 11, pp. 78–83. 3. Zakirov I.S., Zakharova E.F., Orekhov E.V. et al., Features of studying the structure of the void space of Domanik formations on the basis of tomographic (In Russ.), Neftyanaya provintsiya, 2019, no. 2(18), pp. 25–42.