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A new effective modification of the AC-CSE-1313-A reagent used in water control technologies, repair and insulation works – the AC-CSE-1313-B reagent (polymer-gel SPA-Well technology) has been developed. The reagent AC-CSE-1313-B is a ready-made chemical composition. The gel-forming system in SPA-Well technology is obtained by dissolving the commercial form of the reagent in technical water. An aqueous solution of the AC-CSE-1313-B reagent under reservoir conditions forms a visco-plastic gel screen in the zones of water advance. Laboratory studies have found that the reagent AC-CSE-1313-B is thermostable at temperatures up to 130 ºC, not subject to mechanical destruction during the preparation of the working solution and its injection into the reservoir, and has several advantages, such as increased rheological characteristics, reduced corrosion activity, and ease of application (reduces complexity and improving safety at work). The rheological and technical characteristics of gels based on the AC-CSE-1313-B reagent are not inferior to similar characteristics of gels based on commercially used polymers. Pilot tests of the SPA-Well water control technology for injection wells using the AC-CSE-1313-B reagent were conducted in 2019 at the Vyngapurovskoye (2 wells) and Tailakovskoye (2 wells) fields. At the Vyngapurovskoye field additional oil production (AOP) for 8 months after treatment was 823 and 887 tons per well, which exceeds the AOP obtained at the field for the same period by the water control technologies using other gel-forming compositions, as well as solutions based on PAA. At the Tailakovskoye field the AOP for 8 months was 724 and 1690 tons per well, the effect continues. The calculated forecast AOP by the end of 2020 will be more than 2000 tons per well, which significantly exceeds the efficiency of the water control technology with the use of similar gel-forming compounds. Taking into account the positive results of laboratory and field tests, the gel-forming reagent AC-CSE-1313-B is recommended for industrial use in water control technologies – as a more effective analog of the currently used gel-forming and polymer compositions. References 1. Patent no. 2592932 RU, Composition for increasing oil production, Inventors: Fakhretdinov R.N., Yakimenko G.Kh., Selimov D.F. 2. Vinokhodov M.A., Yarkeev A.R., Kuznetsov M.A. et al., Technological efficiency of applying the new gelling AC-CSE-1313 technology in oil and gas industry (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2016, no. 10, pp. 90–94. 3. Kuznetsov M.A., Ishkinov S.M., Kuznetsova T.I. et al., The constantly developed research and production programs of industrial adaptation of injectivity profile leveling technologies for low permeability reservoirs of Slavneft-Megionneftegas OJSC (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2015, no. 10, pp. 106–110. 4. Tastemirov S.A., Fakhretdinov R.N., Yakimenko G.Kh. et al., The experience of AC-CSE-1313 technology at the Priobskoye field (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2019, no. 4, pp. 70–73. |
