The article is devoted to the issues of cleaning oil pipelines and tanks from wax wall deposits and bottom sediment to solve the problems of operation, as well as to transfer them to pumping oil products. To solve these problems, it is proposed to use the chemical washing method, which makes it possible to implement a closed unmanned technology without opening of inner surface. The new technology proposed is based on practical experience in flushing process pipelines at an oil pumping station and sections of the linear part of main oil pipelines using hydrocarbon solvents. The analysis showed the shortcomings of the technology used, associated with high costs, due to excessively consumed volumes of wax solvents, which significantly affects the profitability of washing. At the same time, the results of analytical quality control of cleaning and samples of spent cleaning solutions, using the example of the considered practical experience, showed the possibility of using water as a ballast for filling and pressing pipelines and tanks to be cleaned to significantly reduce the cost of washing by reducing the consumption of expensive hydrocarbon solvents. The paper presents the results of studies of the effectiveness of model cleaning solutions based on water-hydrocarbon emulsions tested on wax samples from pipe wall segments and tanks bottom sediments. The advantages of water-hydrocarbon emulsions for solving the problem of transferring oil pipelines and pumping stations to light oil products are briefly substantiated. The practical experience of applying chemical washing technology using hydrocarbon solvents is analyzed. During laboratory tests, the high residual washing ability of water-hydrocarbon emulsions was confirmed in comparison with the initial solvents. To remove inorganic or undissolved sediment particles, the minimum flow rates necessary for their removal from the pipeline are determined. To improve the efficiency of washing tanks, ultrasonic treatment is proposed - both for the preparation of water-hydrocarbon washing emulsions, including invert type, and to enhance the dispersing effect due to cavitation.
References
1. Lisin Yu.V., Mastobaev B.N., Shammazov A.M., Movsum-zade E.M., Khimicheskie reagenty v truboprovodnom transporte nefti i nefteproduktov (The chemicals in the pipeline transport of oil and oil products), St. Petersburg: Nedra Publ., 2012, 360 p.
2. Chentsov A.N., Timofeev F.V., Mukhametshin R.R., Zamalaev S.N., Experience of experimental and practical arrangements regarding preparation of the linear part of oil pipeline for transportation of diesel fuel of ecological class 5 according to the technical regulation of transportation facility 013/2011 (In Russ.), Nauka i tehnologii truboprovodnogo transporta nefti i nefteproduktov, 2014, no. 3, pp. 32–38.
3. Revel'-Muroz P.A., Polyakov A.A., Fridlyand Ya.M., Switch to the transportation of diesel oil of the oil pipeline and equipment, applied on the facilities of JSC "Transneft" (In Russ.), Nauka i tehnologii truboprovodnogo transporta nefti i nefteproduktov, 2015, no. 2, pp. 16–20.
4. Dizenko E.I., Issledovanie protsessa perevoda nefteprovodov na perekachku svetlykh nefteproduktov (Study of the process of transferring oil pipelines to pumping light oil products): thesis of candidate of technical science, Ufa, 1971.
5. Dizenko E.I., Novoselov V.F., Tugunov P.I., Estimation of the optimal need for solvent for flushing process pipelines (In Russ.), Transport i khranenie nefti i nefteproduktov, 1973, no. 9, p. 7.
6. Dizenko E.I., Novoselov V.F., Tugunov P.I., Determination of the critical fluid flow rate for the removal of mechanical deposits from the pipeline (In Russ.), Transport i khranenie nefteproduktov i uglevodorodnogo syr'ya, 1970, no. 12, pp. 8–10.
7. RD 34.21.525. Metodicheskie ukazaniya po ochistke mazutnykh rezervuarov ot donnykh otlozheniy (MU 34-70-165-87) (Guidelines for cleaning oil tanks from bottom sediments).
8. RD 153-39TN-012-96. Instruktsii po pozharovzryvobezopasnoy tekhnologii ochistki neftyanykh rezervuarov (Instructions for fire and explosion-proof technology for cleaning oil tanks).
9. TTK “Tekhnologiya zachistki (ochistki vnutrennikh poverkhnostey) rezervuarov ot ostatkov nefteproduktov” (TTC “Technology for cleaning (cleaning internal surfaces) of tanks from oil residues”)
10. Tekhnologiya ochistki tekhnologicheskikh apparatov i rezervuarov ot shlama i asfal'tosmoloparafinistykh otlozheniy na ustanovke podgotovki nefti pri neftenalivnom terminale i uchet produktov shlamoudaleniya (Technology for cleaning technological apparatuses and tanks from sludge and asphalt-resin-paraffin deposits at an oil treatment unit at an oil loading terminal and accounting for sludge removal products), Orenburg: Publ. of OrenburgNIPIneft', 2005.
11. Bezymyannikov T.I., Makarenko O.A., Analysis of the regulatory and technical-technological solutions for oil tanks cleaning from bottom sediments (In Russ.), Transport i khranenie nefteproduktov i uglevodorodnogo syr'ya, 2022, no. 1-2, pp. 5–11, DOI: 10.24412/0131-4270-2022-1-2-5-11
12. Sunagatullin R.Z., Karimov R.M., Tashbulatov R.R., Mastobaev B.N., Study of the causes for wax deposition under the operating conditions of main oil pipelines (In Russ.), Nauka i tehnologii truboprovodnogo transporta nefti i nefteproduktov = Science & Technologies: Oil and Oil Products Pipeline Transportation, 2020, V. 10, no. 6, pp. 610–619, DOI: 10.28999/2541-9595-2020-10-6-610-619
13. Denisov E.F., Karimov R.M., Makarenko O.A., K voprosu o primenenii khimicheskikh reagentov dlya ochistki ot asfal'tosmoloparafinovykh otlozheniy (On the issue of the use of chemical reagents for cleaning from asphalt, resin and paraffin deposits), Proceedings of International scientific and technical conference dedicated to the memory of Academician A.Kh. Mirzajanzade, Ufa: Publ. of USPTU, 2016, 314 p.
14. Bezymyannikov T.I., Karimov R.M., Tashbulatov R.R., Recovery throughput of technological pipelines and useful volume of tanks for a long time operated pump stations, IOP Conference Series: Earth and Environmental Science, 2020, V. 459, Ch. 2, DOI:10.1088/1755-1315/459/3/032024
15. Bezymyannikov T.I., Karimov R.M., Optimizatsiya protsessov ochistki nefteprovodov ot otlozheniy nefti uglevodorodnymi razbavitelyami (Optimization of processes for cleaning oil pipelines from oil deposits by hydrocarbon diluents), Proceedings of 71st Scientific and Technical Conference of Students, Postgraduates and Young Scientists of USPTU, Ufa: Publ. of USPTU, 2020, pp. 439–440.
16. Bezymyannikov T.I., Makarenko O.A., Karimov R.M., Ob effektivnosti uglevodorodnykh rastvoriteley dlya udaleniya ASPO v nefteprovodakh i rezervuarakh (On the effectiveness of hydrocarbon solvents for the removal of paraffin deposits in oil pipelines and tanks), Neftegazovyy terminal. V. 22, Proceedings of international scientific and technical conference “Aktual'nye problemy transporta i khraneniya uglevodorodnykh resursov pri osvoenii Arktiki i Mirovogo okeana” (Actual problems of transport and storage of hydrocarbon resources in the development of the Arctic and the World Ocean), 2-3 December 2021, Tyumen: Publ. of TIU, 2021, pp. 39–34.
17. Bezymyannikov T.I., Pavlov M.V., Valeev A.R., Mastobaev B.N., Modeling of application of ultrasound for cleaning from asphalt-smolistic and paraffin deposits on the objects of transport and storage of oil (In Russ.), Transport i khranenie nefteproduktov i uglevodorodnogo syr'ya, 2018, no. 3, pp. 22–26, DOI: 10.24411/0131-4270-2018-10301
18. Fazlyev M.N., Dem'yanov A.Yu., Timirgaliev M.Yu. et al., Development of innovative energy-saving technology for cleaning tanks by dispersing deposits (In Russ.), Nauka i tehnologii truboprovodnogo transporta nefti i nefteproduktov = Science & Technologies: Oil and Oil Products Pipeline Transportation, 2021, V. 11, no. 5, pp. 484–491, DOI: 10.28999/2541-9595-2021-11-5-484-491