Influence of temperature and pressure on dynamic metering oil quantity calculation

Abstract: The information on the influence of temperature and pressure on the calculation of dynamic metering oil quantity is provided by excellent flowmeter and flowmeter manufacturers. Abstract: In the dynamic measurement of crude oil, temperature and pressure are two important parameters, which not only directly affect the calculation of the standard volume of crude oil, but also play a non-negligible role in the verification of flowmeters. Whether it is crude oil standard volume or flow meter verification work is final. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the influence of temperature and pressure on the calculation of dynamic metering oil volume. In the dynamic measurement of crude oil, temperature and pressure are two important parameters, which not only directly affect the calculation of the standard volume of crude oil, but also play a non-negligible role in the verification of flowmeters. Whether it is the standard volume of crude oil or the verification of flowmeters, it will ultimately affect the settlement of pure oil volume, which in turn affects the economic interests of both parties involved in the delivery of crude oil. Keywords: dynamic metering, flow meter coefficient, pure oil volume, crude oil working pressure, and oil volume transfer has the characteristics of continuity and large transfer volume. Crude oil is generally in a fluid or semi-fluid state and has micro-compressibility. Like other fluids, temperature changes will inevitably lead to volume changes, and the slightly compressible crude oil determines that the effect of pressure on volume is not significant. Temperature is also the main factor affecting the change of the flowmeter coefficient in the flowmeter verification work. Although the pressure has an influence, it is smaller than the temperature. No matter how big or small, they are directly related to the economic interests of both parties. These issues should be paid enough attention to by our staff engaged in the transfer of measurement. 1. The influence of temperature and pressure on the calculation of oil quantity (1) The influence of temperature on the calculation of oil quantity 'Calculation of Oil Quantity' and GB/T1885-1998 'Petroleum Meter'. It is stipulated in GB9019.5-88 'Calculation of Oil Quantity in Dynamic Measurement of Crude Oil': When calculating the oil quantity, the volume of crude oil at the measurement temperature is converted into a standard volume. The standard volume of crude oil (V20) can be obtained by multiplying the volume at the crude oil measurement temperature (Vt) and the temperature volume correction coefficient (Cti). That is: V20=Vt•Cti=Cti=V20/Vt=ρt/ρ20=[ρ20–υ(t-20)]/ρ20=1-[υ(t-20)]/ρ20 It can be seen from the above formula that there is a linear decreasing relationship between the crude oil temperature volume correction coefficient Cti and the crude oil temperature t, and the Cti value will decrease with the increase of the crude oil temperature. Daqing crude oil belongs to high viscosity and easily condensable crude oil. It is generally transported by hot oil pipelines. The temperature of external transportation is generally between 30 °C and 50 °C. When calculating oil volume, Cti should be used.≤1; when t≤At 20℃, there is Cti≥1. The freezing point of Russian crude oil is low, and the transmission temperature is sometimes lower than 20 °C. Cti should be used for oil calculation.>1. (2) The influence of pressure on the calculation of oil volume The volume of crude oil and liquid petroleum products varies with the pressure, and generally decreases in volume as the pressure increases. Under a certain pressure, the volume change of the oil with higher density is relatively small, and the volume change of oil with lower density is larger. The relationship between crude oil pressure and volume can be expressed as: Vpt=Ve×[1-F×(Pt-Pe)] in the formula: When calculating the oil volume, the crude oil volume needs to be corrected to the standard condition pressure to obtain the crude oil standard volume V20. The relationship between the pressure correction coefficient (Cpi) and the compression coefficient (F): Cpi=1/[1-(Pt-Pe)×F] where: Cpi——Crude oil volume pressure correction coefficient; F——Compression factor of petroleum and liquid petroleum products; kPa-1Pt——Pressure under crude oil metering, °C; Pe——The saturated vapor pressure of crude oil, at the metering temperature, when the saturated vapor pressure is not greater than 101.325kPa, set Pe=0; it can be seen from the above formula that the Cpi value increases with the increase of pressure. 2. The influence of temperature and pressure on the verification of flowmeter At present, the dynamic measurement method with flowmeter as the main instrument has taken the lead among the domestic crude oil metering and transfer methods. According to the dynamic measurement implementation standard GB9109.1-88 'General Principles of Dynamic Measurement of Crude Oil' and GB9109.5-88 'Calculation of Oil Quantity in Dynamic Measurement of Crude Oil', in the aspect of original volume measurement, there are mainly flowmeter coefficient transfer oil and flowmeter basic There are two measurement methods for error delivery oil. In theory, the flowmeter coefficient delivery method is more accurate, reasonable and fair. According to the actual operation of the flowmeter, the flowmeter should be checked regularly, the basic error should be properly handled, and the flowmeter coefficient should be adjusted in time. However, due to the limitation of the production process, the oil temperature and pressure during the verification of the flowmeter are different from the oil temperature and pressure during the production operation. Among them, temperature is the main factor affecting the change of the flowmeter coefficient. Although the pressure has an influence, it has little effect on the flowmeter coefficient. Therefore, the temperature and pressure of the verification and production operation should be kept as consistent as possible. Eliminate the resulting errors. The current standard for flow meter verification is JJG667-1997 'Verification Regulations for Liquid Volumetric Flowmeters'. An external metering station uses a standard volume tube to check the flowmeter online. The specific parameters of the standard volume tube are as follows: inner diameter D=358.0mm; wall thickness e=10mm; volumetric tube body expansion coefficientβs=3.33×10-11-6℃-1; elastic modulus of volume tube material ES=2.04×10-11Pa; numberβ=780×10-6℃-1;

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