In the process of applying pulsed non-stationary flooding of hydrocarbon deposits on the mouth or on the bottom (suspended on the tubing below the packer) of the injection well, hydraulic pulse devices are installed. When they work (creating impulses in the injected liquid), hydraulic strikes occur at the tubing string at a frequency equal to the frequency of the pulses generated, at the output of the devices. As a result, the tubing string and the packer are moved back and forth. Hence, there is a need to ensure the long-term reliability of the sealing elements of the packer and, consequently, the long-term sealing of the annular space for effective liquid injection. Therefore, when constructing seals of movable joints, it is necessary to represent a set of problems of tightness, friction and wear. Several significant factors that affect the durability of the packer seal during long-term pulsed pumping of liquid have been analyzed. When determining the lifetime of the packer, it is necessary to take into account the change in contact pressure with a change in operating temperature and acceleration of the aging process under dynamic conditions due to the vibration of the seating positions (reciprocating packer motion with compaction during continuous impulse pumping of fluids into the well). The combined action of packer movement and pressure pulsation in the compaction intensify the mechanochemical aging processes. To increase the durability of packer seals during long-term pulsed pumping of liquid into the well, in addition to replacing rubber materials with rubber-fabric, it is necessary to use damping equipment complete with impulse devices. Their application will significantly reduce the oscillation amplitude of the packer (the length of the stroke of the sealing element S) and the maximum working time of the seal.
References
1. Khabibullin M.Y., Suleimanov R.I., Selection of optimal design of a universal device for nonstationary pulse pumping of liquid in a reservoir pressure maintenance system, Chemical and Petroleum Engineering, 2018, V. 54, no. 3–4, pp. 225–232, https://doi.org/10.1007/s10556-018-0467-2
2. Khabibullin M.Ya., Arslanov I.G., Abdyukova R.Ya., Optimization of oil replacement process in case of stationary impulse injection of water (In Russ.), Neftepromyslovoe delo, 2014, no. 3, pp. 24–28.
3. Kazymov Sh.P., Abdullaeva E.S., Radzhabov N.M., Structure of swelling packers and their applicability in the fields of Azerbaijan (In Russ.), Nauchnye trudy NIPI Neftegaz, SOCAR, 2015, V. 3, no. 3, pp. 43–51, DOI: 10.5510/OGP20150300251
4. Khabibullin M.Ya., Suleymanov R.I., Sidorkin D.I., Laboratory-and-theoretical studies of operationof two-equalizer design of the device for pulsed injection of liquid into the well (In Russ.), Izvestiya vuzov. Neftʹ i gaz, 2016, no. 5, pp. 109–113.
5. Khabibullin M.Y., Suleimanov R.I., Sidorkin D.I., Arslanov I.G., Parameters of damping of vibrations of tubing string in the operation of bottomhole pulse devices, Chemical and Petroleum Engineering, 2017, V. 53, no. 5–6, pp. 378–384, https://doi.org/10.1007/s10556-017-0350-6
6. Khabibullin M.Ya., Sidorkin D.I., Determination of tubing string vibration parameters under pulsed injection of fluids into the well (In Russ.), Nauchnye trudy NIPI Neftegaz GNKAR, 2016, V. 3, no. 3, pp. 27–32, http://dx.doi.org/10.5510/OGP20160300285
7. Khabibullin M.Ya., Suleymanov R.I., Sidorkin D.I., Arslanov I.G., Parameters vibration damping columns tubing at workdownhole pulse device (In Russ.), Khimicheskoe i neftegazovoe mashinostroenie, 2017, no. 6, pp. 19–23.
8. Kraselʹskiy I.V., Dobygin M.N., Kombalov V.S., Osnovy raschetov na trenie i iznos (Fundamentals of calculations for friction and wear), Moscow: Mashinostroenie Publ., 1977, 526 p.
9. Arslanov I.G., Khabibullin M.Ya., Raschety v teoreticheskoy i prikladnoy mekhanike (Calculations in theoretical and applied mechanics), Ufa: Publ. of USPTU, 2016, 94 p.
10. Khabibullin M.Ya., Suleymanov R.I., Filimonov O.V., Increasing of efficiency of single-time hydroimpulse processings of bottomhole zone of injection wells (In Russ.), Izvestiya vuzov. Neftʹ i gaz, 2017, no. 6, pp. 113–117.
11. Orlov Z.D., Orlov G.S., Chayskaya L.P., Rezinotkanevye uplotneniya (Rubber-cloth seals), Moscow: Publ. of TSNIITEhneftekhim, 1979, 80 p.
12. Kondakov L.A., Rabochie zhidkosti i uplotneniya gidravlicheskikh sistem (Working fluids and seals of hydraulic systems), Moscow: Mashinostroenie Publ., 1982, 216 p.
