Analysis on Measurement Error of Crude Oil Handover

Abstract: The crude oil handover measurement error analysis information is provided by the excellent flowmeter and flowmeter production and quotation manufacturers. Abstract: In the process of dynamic measurement and static measurement of crude oil, the measurement errors of oil products mainly include four factors: volume measurement error of vertical metal tank, measurement instrument error, human operation error, and error caused by the testing process. This article analyzes various. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on the analysis of crude oil handover measurement error. In the process of dynamic measurement and static measurement of crude oil, the measurement errors of oil products mainly include four factors: volume measurement error of vertical metal tank, measurement instrument error, human operation error, and error caused by the testing process. On the basis of analyzing the causes of various errors, this paper summarizes and analyzes some understandings of crude oil measurement during the practice period, and puts forward some suggestions for reducing errors in combination with the actual situation of Ansai Oilfield. Keywords: crude oil measurement, error analysis, influencing factors At present, the crude oil measurement methods of major domestic oilfields basically use static measurement and dynamic measurement. The static transfer measurement system of Wangyao Gathering and Transportation Brigade in Ansai Oilfield adopts vertical metal tanks , The dynamic transfer metering system is a volumetric waist wheel flowmeter. Since the measurement error is unavoidable in the process of handover, it will bring certain economic impact to both parties. Therefore, how to reduce the measurement error and improve the measurement accuracy plays a crucial role in the handover. 1 The analysis of factors causing measurement errors is stipulated in SY5669 'Measuring Regulations for the Handover of Vertical Metal Tanks for Petroleum and Liquid Petroleum Products' and GB9110 'Calculation Method for Measuring Oil Quantity of Crude Oil Vertical Metal Tanks', the total uncertainty of the vertical metal tank measurement system It is 0.35%, and its composition can be verified by the volume of the oil tank. The uncertainty is 0.2%; when the dipstick measures the liquid level, an error of 1mm is allowed, and the uncertainty is 0.01%; when the temperature is measured, it is estimated to 0.25 ℃, which is uncertain When measuring the density, the estimated value is read to 0.0001g/cm3, and the uncertainty is 0.01%; when the moisture content is analyzed, it is read to 0.03%, and the uncertainty is 0.03%. total uncertaintyσ=(σ2 cans +σ2R+σ2 warm +σ2 water +σ2 densities) 1/2 (1) = [(0.002) 2 + (0.0001) 2 + (0.001) 2 + (0.0001) 2 + (0.0003) 2] 1/2 = 0.226% and further consider human factors, the totalσis 0.35%. From the composition of the total uncertainty of the above vertical metal tank measurement system and the analysis of the dynamic handover process, it can be seen that in the process of crude oil handover and measurement in Ansai Oilfield, there are four main reasons for oil measurement errors, namely vertical metal tanks. Tank volume measurement error, measurement instrument error, human operation error and errors caused by the analysis and testing process. 1.1 Volume measurement error of vertical metal tank 1.1.1 Volume calibration error According to JJG168-8 '7 Vertical Metal Tank Capacity' trial verification regulations, the total uncertainty of verification is not more than 0.2% for oil tanks with a capacity of 100 ~ 700m3 ; For oil tanks with a capacity of more than 700m3, the total uncertainty of verification is not greater than 0.1%, and the confidence level is 95%. The error from the actual volume is not more than±0.5%. This shows that there is already an error in the calibration of the tank volume. In addition, since the bottom of the oil tank has a slope of about 0.15% according to the design, due to the influence of construction quality, geology, actual oil storage and other factors, the bottom of the oil tank will produce recoverable elastic deformation after loading. This elasticity The deformation has a certain degree of influence on the measurement results. According to the relevant literature, this uncalculated base error is close to 0.3% of the available capacity. This seriously affects the accuracy of oil measurement. 1.1.2 Waxing on the inner wall of the tank During the use of the oil tank, due to the heating of the oil tank, the temperature is limited by certain conditions, resulting in uneven temperature of the crude oil and resulting in waxing of the crown wall. Because the wax layer has a certain thickness and cannot flow, the oil The diameter of the tank is reduced, and the effective area of ​​the tank is relatively small. 1.1.3 Deformation of the bottom of the oil tank In the design and installation of the tank bottom, there is a protrusion from the longitudinal axis of the tank as the center, inclined to the tank wall, and the slope is about 0.15%. The bottom of the tank is deformed due to the soil quality and construction quality under the tank. There are two types of tank bottom deformation: elastic deformation and permanent deformation, both of which affect the accuracy of measurement. 1) The influence of elastic deformation on measurement. For example, for a metal oil tank, the volume of the convex body at the bottom of the tank is determined to be 100m3 during inspection, and the height of the convex body decreases by 8mm after filling, and its volume is 50m3. The height of the oil foot is 13.5m, and the oil volume of the volume meter is 9450m3. Calculation of oil volume by inspection ruler V inspection = 9450-1050 = 8400 (m3) The actual oil volume increases by 50m3 due to the movement of the bottom of the tank, V = 8400 + 50 = 8450 (m3). Use this tank to collect oil, each time the tank is full, the supply side pays 50m3 more than the calculated oil amount. 2) * The influence of deformation on the measurement. After some cans are used for a period of time, the bottom of the can is deformed from convex to concave, and no longer changes and becomes permanent deformation. The permanent deformation occurs, if it occurs between the two verification cycles of the oil tank, it will have a certain impact on the oil measurement. Since the bottom of the tank is concave, the actual volume in the tank is equal to the value of the volume table plus the volume of the convex volume at the bottom of the tank and the volume of the depression, namely: V total = V table + V convex + V concave Assuming V table = 9450m3 V concave = 50m3 V convex = 50m3, then V total = 9450+50+50=9550 (m3) * The deformation is mainly due to the increase in the amount of bottom oil in the empty tank. The amount of bottom oil should be considered when the first oil is fed after the tank is cleaned.

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