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Title: Dual Venturi Flowmeter For Downhole Multiphase Flow Measurement
Author: J Tim Ong
Source: 2007 South East Asia Flow Measurement Conference
Year Published: 2007
Abstract: Flow measurement has become an integral part of well monitoring in the oil and gas industry. The advent of more complex completions which includes multi-zone and mutli-laterals means that downhole monitoring is needed to be able to accurately determine the production from the separate zones. There are many downhole flow meter (DHFM) technologies available that will accurately determine flow rates for a production of either liquid or gas. However, when these standard flow metering technologies are used in a mixture of liquid and gas, measurement error increases due to the effects of poor density quantification, slip between fluid phases and also compression of gas phase. This is typical for a venturi based DHFM. The general idea of a DHFM is the suppression of gas production by operating above the bubble point (BPt) pressure. This is not often possible in mature fields and also in high GOR crude production. Therefore as field matures the probability of multiphase flow occurring downhole increases. The increase in mature fields in the global production dictates a technology that would be able to tackle this problem. The development of the dual venturi flow meter is aimed at stretching the envelope of downhole measurement to encompass multiphase flow 1. The design was put together in 2001 with one installation performed in the Captain field in the North Sea. The specification is based on flow measurement of all three phases of oil, water and gas produced in the well.

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