Integrated approach to the development of technology of iInjection well bottomhole treatment and the technology efficiency evaluation

UDK: 622.276.63

DOI: 10.24887/0028-2448-2020-7-40-42

Key words: bottomhole formation zone, acidizing, coiled tubing, injection well, surfactant, solid acid

Authors: L.F. Davletshina (Gubkin University, RF, Moscow), I.A. Guskova (Almetyevsk State Oil Institute, RF, Almetyevsk), L.I. Garipova (Almetyevsk State Oil Institute, RF, Almetyevsk), A.S. Ahmetshina (Tatneft, RF, Leninogorsk)

Acidizing is the most common method of oil production stimulation. Its effectiveness depends on many factors. The developed integrated approach includes analyses of the well work deterioration causes and testing of technological compositions under field conditions. Experiments and treatments are carried out under Tatneft PJSC fields conditions. Samples from injection wells were initially analyzed. The presence in bottomhole zone of colmatation substances consisting of iron compounds as iron scale and precipitation of ferric hydroxide, suspended solids as sand and clays particles, hydrocarbons is shown. As a result of the study three technological compositions corresponding to all requirements applicable to reagents of bottomhole zone treatment are selected. The third portion feature of acid treatment is application of sulfamic acid that corresponds with law temperatures of the Romashkinskoe field. The technology developed of cleanup of injection wells bottomhole zone is three-stage well treatment with removal of reaction products. All works are conducted using coil-tubing unit. After treatments the samples are collected. It is confirmed that the iron ions presence is one of the causes of injection wells bottomhole zone colmatation. The high effectiveness of the technology is shown. For the period of the study 200 wells are treated, the success ratio is 85%, the profitability index is 1.2. References 1. Ibragimov L.Kh., Mishchenko I.T., Cheloyants D.K., Intensifikatsiya dobychi nefti (Oil well stimulation), Moscow: Nauka Publ., 2000, 414 p. 2. Silin M.A. et al., Kislotnye obrabotki plastov i metodiki ispytaniya kislotnykh sostavov (Acid formation treatment and methods for acid compositions testing), Moscow: Publ. of Gubkin Russin State University of Oil and Gas, 2011, 120 p. 3. Gus'kova I.A., Analiz faktorov effektivnosti ochistki prizaboynoy zony nagnetatel'nykh skvazhin metodom dinamicheskogo izliva (Analysis of efficiency factors for cleaning the bottom-hole zone of injection wells using the dynamic spout method), Collected papers “Povyshenie nefteotdachi plastov na pozdney stadii razrabotki neftyanykh mestorozhdeniy i kompleksnoe osvoenie vysokovyazkikh neftey i prirodnykh bitumov” (Enhanced oil recovery at a late stage of oil field development and integrated development of high-viscosity oils and natural bitumen), Proceedings of International scientific and practical conference, Kazan': FEN Publ., 2007, pp. 195–197. 4. Glushchenko V.N., Silin M.A., Neftepromyslovaya khimiya (Oilfield chemistry), Part 4. Kislotnaya obrabotka skvazhin (Acid treatment of wells): edited by Mishchenko I.T., Moscow: Interkontakt Nauka Publ., 2010, 703 p. 5. Magadov R.S., Silin M.A., Paevoy E.G., Magadova L.A., Pakhomov M.D., Davletshina L.F., Mishkin A.G., The development of well acidizing using the additive Neftenol K (In Russ.). Neft', Gaz i Biznes, 2007, no. 1–2, pp. 93–97 6. Silin M.A., Magadova L.A., Davletshina L.F., Efanova O.Yu., Research of deep samples out of injection wells carried out with the aim of development of compositions and technologies for treating of a formation bottom area (In Russ.), Neftepromyslovoe delo, 2013, no. 7, pp. 36–40.