Abstract
As we all know, cyclic gas injection is one of the most effective development methods to improve condensate oil recovery. When dealing with the calculation of the reserves, the injection-production differences and water influx create great influence on the accuracy. Based on the existing research, we proposed a new material balance equation which considered the differences of composition between produced and injected fluids and the effect of water influx, and a solution was provided in this paper. The results of the method are closer to the actual situation because they are built on the law of conservation of mass, and the using of curve fitting method can not only avoid the use of water influx coefficient but also obtain the water influx rate and reserves at the same time. The YH-23 gas condensate reservoir is taking as a typical subject to do the research, which has been exploited by cycle gas injection for 14 years. Three different methods are used to calculate the reserves, and the results show that the method proposed in this paper has minimum error of 2.96%.
Highlights
Classical material balance method is one of the fundamental tools of reservoir engineering
The method is applicable to condensate gas reservoir developed by cyclic gas injection, which reflects the influence of water invasion and injection-production differences
The condensate gas reservoir of YH-23 located at the bottom of the paleogene and the top of the cretaceous, characterizing with high formation pressure, high dew pressure and high condensate oil content
Summary
Classical material balance method is one of the fundamental tools of reservoir engineering. (2015) A New Method for the Dynamic Reserves of Gas Condensate Reservoir Using Cyclic Gas Injection Based on the Effects of Reinjection Ratio and Water Influx. When using material balance equation to determine the original gas-in-place of gas condensate reservoirs, the expression of two fluids must be separated, and otherwise the result is unreliable [8]. How to calculate the rate of water invasion correctly while analyzing the performance and calculating the dynamic reserve with material balance equation is still a difficulty for a long time. We build a new method and solution, which can be used to determine reserves and water influx rate. The method is applicable to condensate gas reservoir developed by cyclic gas injection, which reflects the influence of water invasion and injection-production differences
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