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Title: Compressibility Of Natural Gas
Author: Jeffrey L. Savidge, Ph.D.
Source: 2014 International School of Hydrocarbon Measurement
Year Published: 2014
Abstract: the accurate measurement of natural gas an d natural gas related fluids is diffi cult. It requires care, experience, and insight to achieve consistently accurate measurements that can meet stringent fiscal requirements. It is particularly difficult to measure complex fluid mixtures that are exposed to: (1) a range of operating conditions, (2) dynamic flow and fluid property behavior, and (3) changing equipment conditions. The compressibility factor is a ubiquitous concept in fl uid measurement. It is used throughout many measurement practices and standards. At its most practical level, the compressibility factor is another fluid measurement correction factor. Unfortunately the mathematical methods, tools, descriptions and d ata associated with the compressibility factor obscure much of its simplicity. The purpose of thi s paper is to provide background on the development of the compressibility factor and related meth ods. It discusses its use in natural gas measurement and provides examples of the behavior of the compressibility factor. Lastly it illustrates the level of uncertainty that current compressibility factor data, methods and related property standards provide

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