The well workover at the most fields of the Krasnodar region is complicated by the large water cut, the presence of absorbing layers, and the destruction of bottom-hole zones of wells. After completing geological and engineering operations wells often cannot be brought to the project flow rate. The process of washing clay-sand and proppant plugs is complicated by significant absorption, leading to layers colmatation by process fluids and mechanical particles of the plug. In some cases, the effect of the work may be zero or even negative, in this case, the well after repair is transferred to the idling or abandoned well stock.
To solve these problems during well workover the authors proposed the technology for borehole cleaning under depression by removal of clay-sand or proppant plugs and colmatants followed by vibration-wave impact on the bottomhole formation zone for the production stimulation. Vibration-wave impact can be combined with chemical reagents exosure (acids and solvents of asphalt-resin-paraffin deposits). This technology was implemented using the developed source of hydrodynamic oscillations (downhole vibrator) and submersible jet pump. Models of calculation of jet devices in relation to well conditions are analyzed. Pilot implementation of the developed methods and technologies in oil wells in Krasnodar region, as well in water supply well in the Southern Federal District shows their high efficiency coupled with relatively low costs.
References
1. Sukovitsyn V.A., Sovershenstvovanie tekhnologiy vosstanovleniya germetichnosti krepi i promyvki skvazhin v usloviyakh znachitel'nogo padeniya plastovykh davleniy (Improving the technology of restoring the tightness of lining and flushing wells in conditions of a significant reservoir pressure decline): thesis of candidate of technical science, Stavropol', 2013.
2. Drozdov A.N., Terikov B.A., Application of submerged jet pumps systems with dual-string lift for the sticky holes operation (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2009, no. 6, pp. 68–72.
3. Drozdov A.N., Drozdov N.A., Prospects of development of jet pump’s well operation technology in Russia (In Russ.), SPE 176676-MS, 2015.
4. Strunkin S.I., Alekseev A.V., Mukhutdinov I.A. et al., Uvelichenie effektivnosti ochistki PZP s primeneniem UPS (In Russ.), Inzhenernaya Praktika, 2015, no. 10, URL: https://glavteh.ru/ochistka-zaboya-mekhprimesi-ups/
5. Drozdov A.N., MalyavkoE.A., AlekseevY.L., Shashel O.V., Stand research and analysis of liquid-gas jet-pump’s operation characteristics for oil and gas production (In Russ.), SPE 146638-MS, 2011.
6. Drozdov A.N., Vykhodtsev D.O., Gorid'ko K.A., Verbitskiy V.S., Express method of jet pump characteristics calculation for well operation (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2018, no. 2, pp. 76–79.
7. Drozdov A.N., Stand investigations of ESP's and gas separator's characteristics on gas-liquid mixtures with different values of free-gas volume, intake pressure, foaminess and viscosity of liquid (In Russ.), SPE 134198-MS, 2010.
8. Sokolov E.Ya., Zinger N.M., Struynye apparaty (Jet devices), Moscow: Energoatomizdat Publ., 1989, 352 p.
9. Omel'yanyuk M.V., Pakhlyan I.A., Gidrodinamicheskie i kavitatsionnye struynye tekhnologii v neftegazovom dele (Hydrodynamic and cavitation jet technology in oil and gas business), Krasnodar: Publ. of CSTU, 2017, 215 p.
10. Certificate of state registration database no. 2018620362, Baza dannykh “Struynye apparaty v neftegazovykh tekhnologiyakh” (Database “Jet Apparatus in Oil and Gas Technologies”), Authors: Pakhlyan I.A., Omel'yanyuk M.V., Ivlev M.V. et al.
11. Dyblenko V.P., Kamalov R.N., Shariffulin R.Ya., Tufanov I.A., Povyshenie produktivnosti i reanimatsiya skvazhin s primeneniem vibrovolnovogo vozdeystviya (Increasing productivity and reanimation of wells using vibrowave impact), Moscow: Nedra-Biznestsentr Publ., 2000, 381 p.
12. Patent no. 2542015 C1 RF, Rotary hydraulic vibrator, Inventors: Omel'yanyuk M.V., Pakhlyan I.A., 2015.
13. Patent no. 2542016 RF, Method of well bore zone treatment for productive formation, Inventors: Omel'yanyuk M.V., Pakhlyan I.A., 2015.
