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Title: Test Of A 1 Inch Roxar Watercut Meter On Light Condensate With Very Low Water Content
Author: Georg Johnsen
Source: 2007 South East Asia Flow Measurement Conference
Year Published: 2007
Abstract: The Oil industry is rapidly moving towards more difficult crude products, as more and more of the easy produce able crude oil will be finished. This leads to new challenges for the whole industry, finding better equipment to coupe with these challenges. One such trend is in the oil business is moving towards lighter oils or condensates. These will have to be processed and transported under high pressure, to stay liquid. The residue water, more or less saline, in condensates can cause serious corrosion problems in the downstream process equipment and pipelines. The Roxar Watercut meter have undergone a test on light condensate, with standard density of about 625 kg/m3, to establish how good the meter is for measuring the very low water content in such products. The ordinary process conditions were 0-650 ppm volume water, while the maximum range was 0-1650 ppm. The test took place offshore on a real condensate line, and was conducted by a large oil company. A standard Watercut meter was optimized during the installation process for optimization to these process conditions. Also the different contributions to the total measurement uncertainty from the different sensors (microwave, temperature and density) were evaluated, to see if such an installation was possible in the first place. In-line calibration is crucial on such installations, because it basically will compensate for any biased uncertainty in the measurement system. Establishing the dry oil permittivity under such circumstances is crucial for correct determination of the water content in the meter. Also, sampling several times, then averaging the samples, gives a very good correspondence, better than 50ppm under fairly stable process conditions.

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