Nowadays, the task of finding methods for intensifying oil production in reservoirs with deteriorated reservoir properties is becoming increasingly urgent. This article discusses the process of modifying the phase permeability of the bottomhole zone of wells. That kind of well interventions is supposed to maintain production by reducing the production watercut during water breaks through macrofractures according to exploitation factors. Yurubchen-Tokhomskoye field is used as the example of applying such well intervention method. Modification of the phase permeability of the bottomhole zone is proposed to be carried out in two stages. At the first stage, the bottomhole treatment is carried out by injecting degassed oil from the well into the reservoir. The second stage includes gravity separation – period of inactivity, unnecessary to disband watering cone with gravity. The effect of the implementation of such measure is justified by the reduction of water saturation in the bottomhole zone of the wells being treated. A mechanism for understanding the gravity separation process in a fractured carbonate reservoir is proposed using a systematic approach analysis of well production, indicator diagrams for both liquid and oil as well as laboratory core studies. For computing purposes, the assumption is used that the fluid filtration process towards the well occurs according to Darcy’s linear law.
References
1. Gazizov A.Sh., Khananov R.G., Gazizov A.A. et al., Hydrophobization of rocks in the bottomhole formation zone as a method for increasing well flow rates and reducing water cut in the produced fluid (In Russ.), Neftegazovoe delo, 2005, no. 1, рр. 1-12.
2. Osipenko A.A., Boykov O.I., Nazarov D.V. et al., Practical aspects of the identification of the void space of cavern-and-fracture reservoirs in conditions of an extremely low porosity (In Russ.), Karotazhnik, 2019, no. 6(300), pp. 134-144.
3. Bykova A.A., Korolev M.S., Determination of the current oil saturation in oil deposits based on the results of hydrodynamic studies (In Russ.), Mezhdunarodnye nauchnye issledovaniya, 2021, no. 3-4 (48-49), pp. 5–8, DOI: https://doi.org/10.34925/JISR.2021.49.4.001
4. Korolev M.S., Nurmakin A.V., Munasypov A.A., Minnegaliev R.F., Determination of current oil saturation using well indicator line processing (In Russ.), Akademicheskiy zhurnal Zapadnoy Sibiri, 2016, V. 12, no. 3 (64).
5. Joshi S.D., Horizontal well technology, Tulsa, Oklahoma, USA: Pennwell Publishing Company, 1991, 535 р.
