Optimal pumping equipment arrangement is one of the key tasks in the modern oil industry. The article considers the characteristics of a tapered pump. The conclusions are made that can be used in the selection of equipment. It is noted that the equipment is not always optimally matched to the well. Situations arise when any section of the pump starts operating outside the operating range, especially for non-standard equipment layouts such as a tapered pump. The performance of the tapered pump section in the negative pump head zone is studied insufficiently. This is the main reason for carrying out experiments and clarifying calculation algorithms. Experimental confirmation of the characteristics of a tapered pump as an algebraic sum of the characteristics of each section is provided. The authors describe a research of the characteristics of a tapered pump manufactured by Novomet-Perm, both in the positive and negative pump head zone at various frequencies. Also the operation of the upper section beyond the right boundary was analyzed. During the analysis it was found that in certain operating modes, processes occur that reduce the performance of equipment. In some situations, the deterioration of the installation increases. This type of operation is undesirable, because it leads to decrease in service life and should be avoided. The article provides recommendations on how these undesirable modes can be avoided for different frequencies and pumps.
References
1. Ageev Sh.R., Grigoryan E.E., Makienko G.P., Rossiyskie ustanovki lopastnykh nasosov dlya dobychi nefti i ikh primenenie (Russian vane pumping systems for oil recovery and their use), In: “Entsiklopedicheskiy spravochnik” (Encyclopedic reference book), Perm: Press-master Publ., 2007, 645 p.
2. Mironov Yu.S., Reducing the harmful effects of free gas on the operation of a submersible centrifugal pump (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 1969, no. 6, pp. 57–59.
3. Swetnam J.C., Sackash M.L., Performance review of tapered submergible pumps in the three bar field, Journal of Petroleum Technology, 1978, V. 30(12), pp. 1781–1787, DOI: https://doi.org/10.2118/6854-PA
4. Zhou D., Sachdeva R., Design tapered electric submersible pumps for gassy wells, SPE-113661-MS, 2008, DOI: https://doi.org/10.2118/113661-MS
5. Ali A., Yuan J., Deng F. et al., Research progress and prospects of multi-stage centrifugal pump capability for handling gas–liquid multiphase flow: comparison and empirical model validation, Energies, 2021, V. 14(4), Article no. 896, DOI: https://doi.org/10.3390/en14040896
6. Ageev Sh.R., Konicheskiy nasos kak sredstvo povysheniya effektivnosti raboty i nadezhnosti ETsN pri otkachke gazozhidkostnoy smesi (Conical pump as a means of increasing the operating efficiency and reliability of ESPs when pumping gas-liquid mixtures), Reports of the XI All-Russian Technical Conference of ALNAS JSC, Moscow: Publ. of ALNAS, 2002.
7. Labakh N., Results of research of two-package "conical" configuration of the electrocentrifugal pump when pumping gas-liquid mix (In Russ.), Neft', gaz i biznes, 2015, no. 2, pp. 60–62.
8. Gorid'ko K.A., Bilalov R.R., Verbitskiy V.S., Express evaluation of the efficiency of a tapered electric submersible pump use when pumping gas-liquid mixtures from a well. Part 1 (In Russ.), Neftepromyslovoe delo, 2021, no. 2, pp. 43 48.
9. Drozdov A.N., Investigations of the submersible pumps characteristics when gas-liquid mixtures delivering and application of the results for SWAG technologies development (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2011, no. 9, pp. 108-111.
10. Drozdov A.N., Drozdov N.A., Bunkin N.F., Kozlov V.A., Study of suppression of gas bubbles coalescence in the liquid for use in technologies of oil production and associated gas utilization, SPE-187741-MS, 2017, DOI: https://doi.org/10.2118/187741-MS
11. Drozdov A.N., Gorelkina E.I., Development of a pump-ejector system for SWAG injection into reservoir using associated petroleum gas from the annulus space of production wells (In Russ.), Zapiski Gornogo instituta = Journal of Mining Institute, 2022, V. 254, pp. 191–201, DOI: http://doi.org/10.31897/PMI.2022.34
12. Peng Y., Liao T., Kang Y. et al., Unlock the liquid loaded gas wells with ESP technology: The successful ESP dewatering application in China Sichuan gas field, IPTC-18801-MS, 2016, DOI: https://doi.org/10.2523/IPTC-18801-MS
13. Prishchepo D., Khruleva E., Ponomarev A. et al., Development of domestic technologies of offshore wells operation in the Arctic shelf of Russia (In Russ.), Territoriya Neftegaz, 2019, no. 3, pp. 56–59.
