Reasons and Countermeasures for the Decrease of Accuracy of Crude Oil Mass Flow Meter in the Verification Period

Abstract: The reasons and countermeasures for the decline of the accuracy of crude oil mass flow meters during the verification period are provided by excellent flow meter and flow meter manufacturers and quotation manufacturers. 2015-10-12 11:36:26Click: 241 Reasons and countermeasures for the decline of the accuracy of crude oil flowmeters in the verification period When the flowmeter enters the factory, due to the field strip. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the reasons for the decline in the accuracy of crude oil mass flowmeters during the verification period and the countermeasures. 2015-10-12 11:36:26Click: 241 Reasons and Countermeasures for the Decrease of the Accuracy of Crude Oil Flow Meters in the Verification Period When the flowmeter enters the factory, because the site conditions are not available, it is directly installed on site and put into use without verification; some crude oil flowmeters have no nameplate after unpacking or the nameplate is lost during transportation, and some are replaced by the nameplate of the photoelectric pulse counter The nameplate of the crude oil flowmeter makes the technical parameters such as the pressure level of the crude oil flowmeter unclear; some crude oil flowmeters have the phenomenon that the installation position of the crude oil flowmeter is inclined and the flange gasket protrudes into the pipe due to the failure of the installation technology. Keywords: 1. Analysis of the reasons for the out-of-tolerance of crude oil flowmeters in the verification period ; When some crude oil flowmeters enter the factory, due to the lack of on-site conditions, they are directly installed on site and put into use without verification; some crude oil flowmeters have no nameplate after unpacking or the nameplate is lost during transportation, and some use photoelectric pulses. The nameplate of the counter replaces the nameplate of the crude oil flowmeter, which leads to unclear technical parameters such as the pressure level of the crude oil flowmeter; some crude oil flowmeters are not up to the requirements due to the installation technology, and the installation position of the crude oil flowmeter is inclined and the flange gasket protrudes. phenomenon in the tube. (2) The installation quality has no straight pipe section requirements for the positive displacement flowmeter. Some crude oil flowmeters do not have a straight pipe section of sufficient length before and after, and the inlet and outlet of the flowmeter are directly connected to the elbow; some remove the filter screen and air eliminator installed in front of the flowmeter and use it. (3) Reasonable selection Some crude oil flowmeters are unreasonable, mainly because the diameter of the flowmeter does not match the pipeline transport flow; some flowmeters do not meet the type, and the sand control type should be selected instead of the ordinary type; some The pressure level does not meet, which directly affects the use effect of the crude oil flowmeter. 2. Errors caused by the volume tube (1) The volume tube used to verify the crude oil flowmeter has not been regularly verified or the verification period has been extended, the volume tube has not been verified periodically or the verification period has been extended at will; Inspection, causing the standard value to be out of tolerance. (2) The volume tube has been repaired to change the value. It has not been verified by the national station, but has been put into use directly after self-inspection. During the on-site verification, the volume tube was not operated strictly according to the user manual of the volume tube, and some pipelines and valves of the volume tube leaked, which directly affected the measurement accuracy of the volume tube of the crude oil flowmeter, and also resulted in inaccurate verification results. 3. Errors caused by the verification method (1) When verifying the crude oil flowmeter, do not strictly follow the crude oil flowmeter verification procedures, and perform the verification when the flow rate in the crude oil flowmeter is unstable. (2) The calibration is not performed under the working conditions of the crude oil flowmeter, especially in order to save time, the calibration is often performed when the temperature of the oil passing through the crude oil flowmeter and the oil temperature of the volume pipe have not reached equilibrium. (3) There is leakage in the calibration pipeline and the outlet valve of the crude oil flowmeter. (4) The reasonable curve in the actual use of the crude oil flowmeter is not considered in the verification process. (5) The newly commissioned crude oil flowmeter should be verified without removing the gas in the metering chamber. (6) Verify that the gas in the standard section of the volume tube is not completely removed. 4. There are two common types of oil products in the oilfield development process with poor crude oil quality: one is to measure the purified oil treated by the centralized processing station; of impurities and sandy crude oil. There are two situations in which poor oil quality affects the measurement accuracy of crude oil flowmeters: one is that solid impurities are entrained in the oil, such as sand particles, welding slag, wax, exfoliation of the inner wall of the pipeline, etc.; the other is that the organic or inorganic substances contained in the oil exceed the standard. For example, iron salts are easy to stick to the oil filter screen or the metering cavity of the flowmeter.

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