Stabilization of the energy state of the formation by balancing the extraction of oil and gas of gas cap in the conditions of a carbonate cavernous-fractured reservoir of Yurubchenskaya deposit

UDK: 622.276.23/.24.038
DOI: 10.24887/0028-2448-2022-5-80-83
Key words: Riphean deposits, carbonate cavernous-fractured reservoir, gas cap, reservoir pressure, oil production, associated petroleum gas
Authors: P.E. Koshmanov (Vostsibneftegas JSC, RF, Krasnoyarsk), F.A. Isbir (Rosneft Oil Company, RF, Moscow)

The paper presents a research of the process of the carbonate reservoir developing with a fractured-cavernous capacity on the example of the Yurubcheno-Tokhomskoye oilfield of the Krasnoyarsk region. The carbonate reservoir of the Riphean deposits, composed mainly of dolomite, forms a low-permeability matrix with a system of micro- and macro fractures and caverns, with the capacity of less than 2%. A system of subvertical fractures connects extensive gas cap, oil-saturated layer and aquifer, which leads to exploitation complications such as a gas and water breakthroughs. Additionally it is causes the low efficiency of a formation pressure maintenance system by water injection. Two points of water injection into Riphean deposits are organized at the field for produced water utilization, but this does not have a significant effect on reservoir pressure. An excess drop in reservoir pressure accompanies the start of commercial development and the intensification of oil production. The analysis of production data showed that the decline rate reservoir pressure is directly related to the increase in gas cap gas production. The paper considers an approach to stabilizing the energy state of the reservoir by balancing the extraction of oil and gas. A research program was implemented, during which an evaluation of changes in reservoir pressure, gas-oil ratio and the decline oil production rate when limiting associated petroleum gas was made. It is shown how the control of the gas extraction rate by well shutdown with a high gas-oil ratio makes it possible to compensate for the loss of oil production and obtain positive effect on the cumulative oil production.


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