Department of Mechanics, Azerbaijan State Oil and Industry University, Baku, Azerbaijan:

R. A. Gasanov, Professor, Doctor of Engineering Sciences
Dzh. R. Gasymova, Doctoral Candidate, gasymova1974@list.ru

The present-day problem of the oil and gas industry is the shortage of hydrocarbon production. Modern technologies enable production of hydrocarbons in amount not more than 25–50 % of overall reserves, which impedes efficient natural wealth management. Geological conditions worsen persistently since striking and early exploitation of reservoirs. The causes of permeability degradation in wellbottom zone during drilling and operation of wells are determined. It is found that during construction and operation of a well, the fluid-bearing characteristic of the wellbore area can be infringed. The review of the available practices shows that the method of cavitation enables efficient recovery of wells with mudding of the screen and wellbottom zones to 100 %. Cavitation generators stimulate porosity and permeability of oil- gas- and fluid-bearing strata. The pressure required for fracture opening is is 2–2.5 times lower with breakaway cavitation as against the hydraulic fracturing methods. The use of a cavitation generator during hydraulic fracturing enhances efficiency of the latter. The process fluid can be fresh or reservoir water, which cuts down expenses connected with chemical agents and other expendables. The treatment of wells up to the maximum pressure lasts for not longer than 6 h. The method is applicable in wells of any type (production, injection, disposal, etc.) to 4000 m long and more. The cost of well treatment by the breakaway cavitation method is a few times less than the cost of hydraulic fracturing.

1. Kerimov V. Yu., Gasanov A. B., Gurbanov V. Sh., Abbasova G. G. Petrophysical characteristic of deep oil and gas reservoirs in inland and offshore fields in Azerbaijan. Eurasian Mining. 2020. No. 1. pp. 3–8. DOI: 10.17580/em.2020.01.01
2. Caineng Zou. Unconventional Petroleum Geology. 2nd ed. Amsterdam : Elsevier, 2017. 500 p.
3. 2016 Minerals Yearbook : Azerbaijan. U.S. Geological Survey, 2020. Available at: https://www.usgs.gov/media/files/mineral-industry-azerbaijan-2016-pdf (accessed: 15.06.2021).
4. Rzaeva S. M. Filtration and capacitive properties of sediments of the productive stratum (Lower Pliocene) of the Guneshli and Kapaz fields. Nauchnye issledovaniya XXI veka. 2019. No. 2. pp. 654–658.
5. Alizadeh A. A., Guliyev I. S., Kadirov F. A., Eppelbaum L. V. Geosciences of Azerbaijan. Series: Regional Geology Reviews. Cham : Springer, 2017. Vol. II. Economic Geology and Applied Geophysics. 340 p.
6. Shehu S. A., Jethro M. A., Ogbodo D. A., Hashim M. H. M. Correlation of blasting coefficient with drilling rate of rocks. Materials Today: Proceedings. 2019. Vol. 17. pp. 543–552.
7. Beshenkov P. S., Polushin N. I., Gkhorbani S., Sorokin E. N. Stress distribution analysis of PDC drill bits by computer modeling. Eurasian Mining. 2017. No. 2. pp. 25–28. DOI: 10.17580/em.2017.02.06
8. Guseynova N. I. Hydrodynamic express monitoring of zonal impact on productive reservoirs of oil fields taking into account well interference. Neftegazovoe delo. 2017. Vol. 15, No. 3. pp. 41–46.
9. Omelyanyuk M. V., Pakhlyan I. A. Efficiency increase of producing wells development and operation due to application of impulse-shock, cavitational impact on the wellbore zone of a productive formation. Neftepromyslovoe delo. 2014. No. 11. pp. 19–23.
10. Hydraulic fracturing. Neftegaz.RU, 2013. Available at: https://neftegaz.ru/tech-library/tekhnologii/141812-gidravlicheskiy-razryv-plasta-grp/ (accessed: 15.06.2021).
11. Borehole slotting in wellbottom zone in pay zone. The goal and mechanism of the process. Available at: https://helpiks.org/5-70334.html (accessed: 15.06.2021).
12. Petukhov I. M. Drainage rate control in borehole slotting. GIAB. 2007. No. 8. pp. 153–157.
13. Grebennikov V. T., Ivanov A. N., Popov M. Yu. Method for production or injection well output increase by well zone stress reduction. Patent RF, No. 2274735. Applied: 11.10.2004. Published: 20.04.2006. Bulletin No. 11.
14. Chemical treatment—well. 2021. Available at: https://www.ngpedia.ru/id197788p2.html (accessed: 19.04.2021).
15. Gimatudinov Sh. K. (Ed.). Oil field development design and operation manual. Oil production. Moscow : Nedra, 1983. 455 p.
16. Priymachenko D. A. Improvement technology and equipment for gas treatment of wellbottom zone : Dissertation … of Candidate of Engineering Sciences. Moscow, 2009. 178 p.
17. Lyagova M. A. Perforating borer component arrangement for long-hole drilling with special smalldiameter propeller engine : Dissertation … of Candidate of Engineering Sciences. Ufa, 2012. 167 p.
18. Oil recovery enhancement. Gidroservis 2000 LLC, 2018. Available at: http://gidroservice-2000.ru/index.php/stmul (accessed: 19.04.2021).
19. Slyusarev N. I. Enhanced oil recovery technology and equipment : tutorial. Saint-Petersburg : Saint-Petersburg State Mining Institute, 2003. 78 p.
20. Serdyuk N. I. Improvement of cavitation de-mudding technology for screen zone of hydrogeological wells : Dissertation … of Doctor of Engineering Sciences. Moscow, 2005. 294 p.