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Title: Sonar-Based Gas Void Fraction Measurement Improves Coriolis And Turbine Flowmeter Performance In Multiphase Flows (0-10% Gvf)
Author: Ed Otto
Source: 2007 South East Asia Flow Measurement Conference
Year Published: 2007
Abstract: Crude oil production flow regimes are inherently multi-phase, with a significant operating cost directed toward accurately measuring and allocating produced hydrocarbons. Unfortunately, the presence of gas phase in liquid flow impairs accurate measurement by single phase flowmeters. Turbine and Coriolis meters deployed on the outlets of test separators can, if operated under multiphase flow conditions, introduce significant measurement error. These errors influence back allocation and well production allocation factors. In addition, test separator measurement errors, distort the reservoir engineers understanding of production performance and impact associated production models. Therefore, a SONAR-based system to measure the gas void fraction (GVF) next to turbine and Coriolis meters is proposed as a method to correct for the influence of secondary phase gas on flowmeter performance. A series of tests were conducted at Southwest Research Institute (SwRI) to validate this concept. The tests were as designed to simulate separator liquid outflow conditions and to assess the ability of gas void fraction (GVF) measurement to correct for errors introduced by entrained gas in liquid, i.e. gas carry-under, on turbine and Coriolis flowmeter technologies. Test data confirms that turbine and Coriolis meters over-report volumetric flow rate in proportion to the amount of entrained gas. Using the GVF measurement of the SONARbased system provides a simple correction to the primary measurement of both flowmeter types to within 1% of the reference liquid flow rate for 0-10% GVF range.

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