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Title: Field Measurement At Extremely High Pressures
Author: E. A. Thoes
Source: 1956 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1956
Abstract: The orifice meter measurement of the well effluent at pressures above 1,100 psi with acceptable accuracy offers real challenge to the measurement engineer. Very small errors in the measurement are magnified many times by the high pressure. Therefore, to eliminate measurement errors which accumulate, it becomes imperative that the meter station conform to the definite specifications set by the American Gas Association. Small additive errors can be expected if the meter station does not duplicate the basic elements under which the orifice coefficients were originally obtained. Also, consistent errors in the determination of the compressibility, specific gravity, or other factors used to reduce the gas to a standard volume can be additive. Even when the mechanical problems of obtaining the orifice measurement are solved, the measurement error can amount to millions of cubic feet of gas a year.

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