Factors to consider when choosing and choosing a crude oil flow meter Factors to consider when using a crude oil flow meter

Abstract: Factors to be considered when choosing and choosing a crude oil flowmeter Flowmeters are the most commonly used instruments in oil exploration enterprises. The selection of flowmeters used in many production sites in oil fields is not reasonable, and some have installation errors, resulting in excessive measurement errors, and some cannot meet the needs of production or crude oil transfer measurement. generally. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the factors to be considered in the selection and selection of crude oil flowmeters. Flowmeters are the most commonly used instruments in oil exploration enterprises. The selection of flowmeters used in many production sites in oil fields is not reasonable, and some have installation errors, resulting in excessive measurement errors, and some cannot meet the needs of production or crude oil transfer measurement. Generally, high-pressure electromagnetic flowmeters are used in oil fields. Many forms of flowmeters can measure crude oil, but when choosing a model based on experience and simply considering the purchase cost, you may lose the opportunity to choose the most suitable meter. For example, the flow range of the instrument does not match the actual flow, and the instrument with high precision is selected for places with low measurement requirements. It can be seen that the correct selection and use of flow meters is not an easy task. To select a crude oil flowmeter correctly and effectively, the following five factors must be considered, namely performance requirements, crude oil physical properties, installation requirements, environmental conditions and costs. Due to the large amount of content, Huijiajie is divided into two chapters for sharing. Today, I will share the first two points. Friends who are interested in this article, please continue to pay attention tomorrow. Flowmeter performance requirements When selecting a flowmeter, the performance requirements to consider include: instantaneous flow, cumulative flow, accuracy, repeatability, linearity, flow range and range, pressure loss, output signal characteristics and response time. Different measurement purposes have different options in terms of flowmeter performance. For example, crude oil trade settlement and measurement have high requirements on accuracy; continuous measurement process control usually requires good reliability and repeatability, and sometimes requires a wide range, and the measurement accuracy requirements should be placed in a secondary position; The flow meter is required to have too high accuracy, but it has good adaptability to the physical properties and working conditions of crude oil. The positive displacement flowmeter usually outputs at the mechanical or pulse frequency, and directly obtains the accumulated flow, which has high accuracy and is suitable for measuring the total amount. Electromagnetic flowmeters, ultrasonic flowmeters, etc., in principle, derive the flow rate by measuring the flow rate of the medium, with fast response, suitable for process control (such as leakage alarm), and the total flow can also be obtained after accumulation. When selecting the flowmeter, the measurement accuracy required by the production process, the fluctuation range of the production site flow, the accuracy within which measurement range is guaranteed, the calibration cycle of the flowmeter required by production or management, and whether on-site on-site liquid verification is required , pressure rating of the flowmeter, explosion-proof rating, etc. If it is necessary to measure the total flow, but also to be applied in the flow control system, such as the flowmeter is not only used as the crude oil transfer metering port, but also considers the signal acquisition of the crude oil pipeline leakage alarm device, the determination of the accuracy of the flowmeter should be controlled in the entire system. Because the whole system not only has the error of flow detection, but also includes the error of signal transmission, control adjustment and other links and various influencing factors. degree is unreasonable and uneconomical. The accuracy level determined by the flow meter specification is within a certain flow range. If it is used within the specified range, the general accuracy is guaranteed. If it exceeds the specified flow range, the actual accuracy is lower than the nominal value, and the measured flow rate is lower than that of the flow meter. It is possible that the flowmeter does not start at the minimum measured value. Usually, the use range of the flowmeter should be used within 30% to 80% of the nominal range. For trade settlement, high accuracy is required, generally not lower than 0.2. The relationship between the persistence of accuracy and the verification period should also be considered, whether it can be guaranteed to be qualified throughout the verification period. The pressure level of the flowmeter should be one order of magnitude higher than the pressure level required by the process flow. For example, if the process flow is 4MPa, the selected flowmeter should generally be 6.4MPa. All crude oil flow meters should have explosion-proof function, and the explosion-proof level should meet the design specifications and safety requirements of oil and gas stations and warehouses. Repeatability is an important indicator in process control applications, which is determined by the principle of the flowmeter itself and the manufacturing quality, but in practical applications, the repeatability of the flowmeter is affected by many factors such as crude oil viscosity, density, surrounding electromagnetic field interference and other factors. Therefore, a place with good repeatability is required,A flowmeter that is sensitive to environmental, media and operating conditions should not be selected. The diameter of the flowmeter should be selected according to the flow range used by the pipeline to be tested and the upper and lower flow limits of the selected flowmeter, rather than simply the diameter of the pipeline. Usually the maximum flow rate of the design pipeline fluid is determined according to the economic flow rate.

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