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目前油田推广应用的井站计量装置均以密度测含水率为基础 ,而在实际应用中却存在较大误差。其主要误差来源是振管式密度计在测量流动状态下的混合液密度时 ,很难达到实验室标定的精度。尤其是流动状态下 ,原油中逸出的天然气会导致以振管式密度计为基础的整套计量装置的可靠性大大降低。本文介绍的两种方案均基于静态条件下对原油含水率进行分析 ,因而不受流速等影响。方案 1中设定电极高度后 ,只需精确地测量出分离器内真实液位高度 ,就可保证整个计量系统的计量精度 ;方案 2是在测量微差压的同时测出分离器内液位高度。目前微差压计的精度很高 ,可以满足计量精度的要求
At present, well site metering devices for oilfield popularization and application are all based on the density measured moisture content, but there is a big error in practical application. The main source of error is that it is difficult to achieve the accuracy of laboratory calibration when the density of vibrating tube densimeter is used to measure the mixed liquid density in the flowing state. In particular, the natural gas escaping from the crude oil under flowing conditions can result in a significant reduction in the reliability of the complete metering system based on vibro-densitometers. The two schemes presented in this paper are based on the analysis of the moisture content of crude oil under static conditions and are therefore not affected by the flow rate and so on. Program 1 set the electrode height, only the precise measurement of the true height of the separator level, you can ensure that the entire measurement system measurement accuracy; Option 2 is measured at the same time differential pressure within the separator height. At present, the accuracy of differential pressure gauge is very high, which can meet the requirements of measurement accuracy