Comparisons of results show that the currently published correlations give poor estimates of K-values for all components, while the proposed new model improved significantly the average absolute deviation error for all components. These K-values were then used to build the model using the Discipulus software, a commercial Genetic Programming system, and the results of K-values were compared with the values obtained from published correlations. Material balance techniques were used to extract the K-values of crude oil and gas components from the constant volume depletion and differential liberation tests for the oil and gas samples, respectively. Constant Volume Depletion (CVD) and Differential Liberation (DL) were conducted for these samples. In this paper, 732 high-pressure K-values obtained from PVT analysis of 17 crude oil and gas samples from a number of petroleum reservoirs in Arabian Gulf are used.
The new model is applied to multicomponent mixtures. This paper presents a new model for predicting K values with genetic programming (GP). Several techniques are available in the literature to estimate the K-values. In particular, they are critical for reliable and successful compositional reservoir simulation. They are important in predicting compositional changes under varying temperatures and pressures in the reservoirs, surface separators, and production and transportation facilities. Alternatively, the compressibility factor for specific gases can be read from generalized compressibility charts that plot as a function of pressure at constant temperature.Equilibrium ratios play a fundamental role in understanding the phase behavior of hydrocarbon mixtures. For a gas that is a mixture of two or more pure gases, the gas composition must be known before compressibility can be calculated. Compressibility factor values are usually obtained by calculation from equations of state (EOS), such as the virial equation which take compound-specific empirical constants as input. In general, deviation from ideal behaviour becomes more significant the closer a gas is to a phase change, the lower the temperature or the larger the pressure. It is a useful thermodynamic property for modifying the ideal gas law to account for the real gas behaviour. It is simply defined as the ratio of the molar volume of a gas to the molar volume of an ideal gas at the same temperature and pressure. Solution 1) Using the Depriester Chart determine that: K1 (propane) 7.0 K2 (n-butane) 2.4 K3 (n-pentane) 0.80 K4 (n-hexane) 0.30 2) Write the Rachford-Rice Equation and substitute in the composition and K-values: Depriester Determination of K-Values Use Newton’s method: Guess V/F0.1 To obtain a new guess we need the derivative of the. In thermodynamics, the compressibility factor ( Z), also known as the compression factor or the gas deviation factor, is a correction factor which describes the deviation of a real gas from ideal gas behaviour. Read this K-value off the chart (approximately 21.3). Note where the line crosses the methane axis.Connect the points with a straight line.On the right-hand vertical axis, locate and mark the point containing the temperature 60☏.On the left-hand vertical axis, locate and mark the point containing the pressure 100 psia.Exampleįor example, to find the K value of methane at 100 psia and 60 ☏. Many DePriester charts have been printed for simple hydrocarbons.
"K" values, representing the tendency of a given chemical species to partition itself preferentially between liquid and vapor phases, are plotted in between. These nomograms have two vertical coordinates, one for pressure, and another for temperature. DePriester in an article in Chemical Engineering Progress in 1953. ( December 2018)ĭePriester Charts provide an efficient method to find the vapor-liquid equilibrium ratios for different substances at different conditions of pressure and temperature. Please introduce links to this page from related articles try the Find link tool for suggestions. This article is an orphan, as no other articles link to it.