Abstract
The study of flooding gas condensate reservoirs at different stages of depletion (25, 50, 75% of the dew point pressure and at the maximum condensation pressure) with different potential hydrocarbon content of 100, 300 and 500 g/m3 and different voidage replacement by using injection (50, 100 and 150%). The results showed a positive effect of water injection on the increase of the condensate recovery factor, but a decrease in gas production compared to the basic options of development at depletion drive. Thus, for formation systems with medium and high potential yield of liquid hydrocarbons C5+, the largest incremental production is obtained in the case when water injection begins with minimum depletion of formation energy. While for a formation system with a low potential yield (100 g/m3) the maximum technological effect is obtained under the condition of maximum depletion. In the case of medium and high C5+ yield in the formation gas, with a slight decrease in the formation pressure by 25 or 50% of the dew point pressure, the maximum increase in the condensate recovery factor is achieved at high injection rates with 100 or 150% voidage replacement. The obtained results can be used for rapid screening of potential methods of impact on the gas condensate reservoir, and the final decision concerning the technological parameters of production and injection wells operation will be made due to the results of optimization of multivariate hydrodynamic calculations using geological and technological models.
Highlights
IntroductionThe design of hydrocarbon reservoirs development is based on a deep understanding of the processes occurring in the formation, namely multi-phase filtration and phase transformations of multicomponent hydrocarbon systems
The design of hydrocarbon reservoirs development is based on a deep understanding of the processes occurring in the formation, namely multi-phase filtration and phase transformations of multicomponent hydrocarbon systems.With regard to gas condensate fields, it is necessary to pay attention to certain features associated with the heavy hydrocarbons condensation when the formation pressure is reduced below the dew point pressure
We study the efficiency of flooding a typical gas condensate deposit at different stages of depletion and with different compositions of formation fluids, expressed in different potential yields of liquid hydrocarbons, to determine the optimal compensation of withdrawal by injection depending on the potential yield
Summary
The design of hydrocarbon reservoirs development is based on a deep understanding of the processes occurring in the formation, namely multi-phase filtration and phase transformations of multicomponent hydrocarbon systems. To increase the gas condensate recovery factor and improve the technical and economic indicators of hydrocarbon production, gas condensate fields, as well as oil fields, should be developed with the maintenance of formation pressure. Possible directions of condensate recovery dropped out from the gas in the formation are its transfer into the gas phase with subsequent extraction together with the gas, displacement from the porous medium by different working agents and their combination [2, 3, 12, 13,14,15]. The results of laboratory experiments on condensate displacement by water from models of porous media conducted in IFNTUNG were used in the design of further development of the Gadyach gas condensate field (horizon B-16) using intracontour (focal) flooding [7, 16] and in the design of secondary condensate recovery from partial depleted gas condensate deposit of the horizon B-19b of the Anastasiyivske field [11, 17]. We study the efficiency of flooding a typical gas condensate deposit at different stages of depletion and with different compositions of formation fluids, expressed in different potential yields of liquid hydrocarbons, to determine the optimal compensation of withdrawal by injection depending on the potential yield
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