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Title: Canadian School Of Hydrocarbon Measurement (CSHM), March 2015, Calgary, Alberta Impact Of Sampling And Subsampling Methods On Liquid Hydrocarbon Analysis And Quality
Author: Branko Banjac Derek Fraser
Source: 2015 Canadian School of Hydrocarbon Measurement
Year Published: 2015
Abstract: Product quality is an important component of petroleum valuation and custody transfer. Measurement and quality professionals are required to coordinate product quality testing in addition to volumetric measurements to determine the value of these products. Western Canada has a wide variety of liquid hydrocarbons that are produced which range from light sweet crudes and condensates to heavy crude oil and bitumens. In addition, the variety of end intermediate products can range from fuels (gasoline, diesel) to other complex mixtures such as dilbits and synthetic crudes. These types of crude oil, fuel and other liquid hydrocarbons are highly variable and differ in physical and chemical properties. They often require specific and specialized sampling techniques for collection of representative testing specimens. The sampling, subsampling or test prioritization that take place are fundamental in the sample analyzing process and have a major impact on quality and accuracy of obtained results. The sampling technique and sample preparation methodologies can equally play an important role in the proper measurement of properties such as density, viscosity and vapor pressure (RVP and TVP), which are the examples of parameters that impact product quality and, ultimately, product valuation. There are also a wide range of chemical parameters used in characterization of crude oils and petroleum products that depend on sampling and subsampling techniques. This paper will provide an overview of sampling methods used in the petroleum industry, covering various types of hydrocarbon liquids and their suitability for various product quality measurements. The discussion will also include information to assist sampling method selection and container selection.

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