In Russia Federation, including Urals-Volga region, significant volumes of original oil in place are located in water-oil zones. Geological structure analysis of major platform-type oil fields has shown that the area of initial water-oil zones covers from 31 to 80.3 % of the total oil-bearing area. Based on the analysis and comprehensive experience it is determined that water-oil zones reserves recovery is 1.5-2 times slower comparing to purely oil areas. Water-oil zone tend to have faster water breakthrough into the producing wells. Oil-water ratio is 2-3 times higher than in the pure oil areas.
The article describes the results of modelling the operation modes well in water-oil contact zones of high-viscous oil fields. Particularly, considered the field with the specific operation, i.e. limited capability of oil-loading unit resulting in constraints to daily water production related to the necessity of transporting and disposing the associated water. The integrated model calculations has shown that shutting down watered wells in the water-oil contact zone (having water-cut below maximal) is not effective for reducing water production. These wells produce significant volume of oil and, therefore, recommended for conversion to another operation mode, which applies a bottomhole pump with the possibility to adjust fluid production rate in wide ranges. The reduction of existing water-cut is observed on these wells. It is established, that reducing the water production from the water-oil contact zone stimulates water inflow into the purely oil area and increases the reservoir pressure, which is favourable for local wells operation, especially when there is no reservoir pressure maintenance system. The reduction of operation costs for the transport and disposal of the associated water compensates economic losses related to the adjustment of well operation and corresponding decrease of oil recovery. Therefore, the options with constraining and adjusting the producing wells operation are economically comparable to the option, which reflects the field’s potential.
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