Efficient methods for calculations of compressibility, density and viscosity of natural gases

Utilization of support vector machine to calculate gas compressibility factor

“…. .,A 11 constants A acceptance probability b bias C regularization parameter E(·) cost of solution e i approximation error K Kernel function P pc pseudo critical pressure P pr pseudo reduced pressure q variable T ac k acceptance temperature T k generation temperature T pc pseudo critical temperature T pr pseudo reduced temperature V actual actual volume V real real volume w weight vector w ij weight coefficient Z-factor compressibility factor i Lagrangian multiplier coupling term variable set of solutions ϑ i threshold coefficient i potential of the ith neuron pr reduced density 2 Kernel parameter ϕ(·) nonlinear mapping function set of all possible solutions number of neuron is sometimes called the compressibility factor or the gas deviation factor (Z-factor), defined as follows [3]:…”

“…Several correlations have been introduced to calculate the pseudo critical temperature and pressure through using various mixing rules [2,[8][9][10][11][12]. Some of the developed correlations express the pseudo critical parameters in terms of gas specific gravity [13][14][15][16][17].…”

“…Thus, a fast and accurate calculation of Z-factor is highly desirable for process engineering calculations and for lower complexity of simulations in the thermodynamics context. This importance is highlighted when dealing with various aspects such as material balances, gas reserve evaluation, gas reservoir simulation, gas well testing and gas processing technologies in upstream and downstream sectors [1,2].…”

Developing novel correlations for calculating natural gas thermodynamic properties

“…Elsharkawy et al (2001) presented a new model for calculating gas compressibility factor based on compositional analysis of 1200 compositions of gas condensates. Also Elsharkawy (2004) presented efficient methods for calculating compressibility factor, density and viscosity of natural gases. This model is derived from 2400 measurements of compressibility and density of various gases.…”

A Novel Correlational Approach to Estimating Natural Gas Viscosity

“…To obtain the viscosity of the nonhydrocarbon and heptane-plus fractions, Elshakaway in 2004[8] modifi ed the Lee-Gonzalez-Eakin correlation as follows:…”