Comparison Methods Of Compression Factor Of Natural Gas And Its Application

In recent years, natural gas increased gradually in the strategic position of energy in China. So the compression factor of natural gas in various pressure and temperature is the basic data required in gas reservoir engineering and gas production technology. Compression factor is also the material balance calculation, an important basis to calculate the reserves of gas reservoir. How to accurate determination of the natural gas compression factor calculation process in the storage, transportation, processing of natural gas is very significant in the development strategy of natural gas.According to the literature and the past practice of scientific research, natural gas compression factor can be calculated by the following ways: 1, The use of measuring instrument; 2, Using the equation of state to calculate the compression factor; 3, Using the empirical formula for calculating the compression factor; 4, Using Standing-Katz chart to determine compression factor.Among them using the empirical formula is the most common way of compressibility factor calculation.By optimization of this in several ways to choose the most common way, and to find the most accurate calculation method from them. After contrast we can learn that: 1, When calculating compression factor with computer, we should use the Dranchuk-Purvis-Robinson, Hall-Yarborough method; 2, When use the artificial calculation, Gopal method is the most suitable; 3, The AGA8-92 DC equation with smaller relative errors in calculation of pipeline natural gas compression factor. Then through the Microsoft Visual Basic 6 to develop natural gas compression factor calculation software. The average relative error of the software can meet the requirements of project and provide more convenient conditions for further computation.Then there’s 2 kinds of known gas components and compression factor of two gas samples using the AGA8-92 DC equation to calculate the two kinds of sample gas compression factor, to judge whether AGA8-92 DC equations are suitable for the compression factor of these two kinds of gas sample calculation or not. After calculation, using AGA8-92 DC equation for calculating natural gas pipeline late development of low and medium pressure carbon lean gas reservoirs can still meet the requirements of accuracy. Calculation of H2 S containing acidic component gas compression factor shows that the AGA8-92 DC equation is not suitable for calculating H2 S acidic component gas compression factor.Finally by using the calculation method of natural gas compressibility factor combined with Beggs-Brill method, the pipeline gas liquid two phase of gas in themixed fluid density and relative density and The volume of a gas flow pipeline conditions can be quickly and efficiently calculated, then the Reynolds number and pressure drop can be calculated.