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Title: Compressibility Of Natural Gas
Author: Paul E. Kizer
Source: 2002 International School of Hydrocarbon Measurement
Year Published: 2002
Abstract: The accurate and equitable measurement of natural gas is paramount to the industry we all serve. This Measurement is the cash register for all Natural Gas buying and selling transactions 23. To serve our industry well, we should endeavor to learn all we can about the principles involved in the accurate measurement of the gas. All gas measurement is based on the application of the Ideal gas laws, derived from: PV nRT Gas compressibility is an important deviation from Ideal gas laws and is important to accurate gas measurement. However, it is often overlooked for the following reasons: It is difficult to understand. It is difficult to calculate. Requires some understanding of chemistry. Hydrocarbons have much more compressibility than so called lnerts. While negligible at base (that is atmospheric) conditions, can be an up to 20% correction on volume Calculations at line pressures. The compressibility factor varies widely due to the composition. The Dictionary for the Petroleum Industry 5 defines Compressibility Factor as: The ratio of the actual volume of gas at a given temperature and pressure to the volume of gas when calculated by the ideal gas law. In other words, PV does not always equal NRT! In fact, W.F. Sheehans Chemistry text 4 defines the Compressibility Factor, Z as:

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