Theoretical and experimental analysis of constant volume depletion test and flash calculation by using a modified algorithmReport as inadecuate




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Nafta : exploration, production, processing, petrochemistry, Vol.63 No.3-4 April 2012. -

Constant volume depletion CVD which simulates closely the actual behavior of a gas condensate reservoir is a very important laboratory test. The results obtained from the laboratory measurements can be directly used to quantify recoveries of condensate and surface gas as a function of pressure below the dew point. The most time consuming section in simulating the compositional reservoir is flash calculation and several approaches have been suggested to speed it up. The physical properties of a fluid depend on whether the fluid is present as a single phase or splits into several equilibrium phases. Therefore to determine the number of equilibrium phases and their compositions and quantities, a flash calculation is needed in each time step. So the required calculation time increases with an increase in number of components. This paper presents the simulation of CVD test for different equation of states EOS-s such as Peng-Robinson PR and Soave-Redlich-Kwong SRK by utilizing MATLAB program and compares the results with data obtaining from laboratory. Current study demonstrated that Saving time and money is one of the benefits of simulating the CVD test instead of laboratory procedure and the results from simulation have only small error from laboratory. This method can be equally applied to other gas condensate samples.

constant volume depletion test; gas condensate reservoir; flash calculation; equations of state model; new algorithm



Author: Hamed Arabi - ; Institute of petroleum engineering, Faculty of Engineering, University of Tehran, Tehran, Iran Soheyla Farahani -

Source: http://hrcak.srce.hr/



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