Do you know how waiting an extra minute for gas and fouling can affect a Coriolis mass flow meter?

  I believe that everyone knows the concept of one minute. One minute can be considered to be very short or very long, but for most people, one minute is an important period of time. Why did the editor look up and say this? I won't introduce it here, I hope it can help you solve all the actual situations. Here we use the Coriolis mass flowmeter to illustrate, what will be the impact? How can we solve it?

  Oil-containing gas, sand and vibrating tube scaling have a great impact on the Coriolis mass flowmeter, which will change the damping ratio and drive gain of the vibrating tube, causing the water content to deviate from the true value, resulting in gas-increasing oil and sand-scaling oil-reducing Phenomenon.

  1. The influence of gas on Coriolis mass flowmeter and its elimination method

  If the gas content of the mixed liquid is greater than 15%, it can be controlled by installing a gas-liquid separator and a buffer tank. This phenomenon gradually decreases in the old oil area with the increase of comprehensive water cut and the decrease of gas-liquid ratio.

  2. Sensor scaling problems and solutions

  Scaling is a difficult point in crude oil production, storage and transportation. The mixing of oil in flow with two or more incompatible water quality and changes in thermodynamic and pressure conditions will lead to scaling. Compared with the transfer station with continuous conveying and stable water type, the loading and unloading station is likely to cause scaling of the Coriolis mass flowmeter sensor due to the complicated oil water type, the poor effect of adding chemicals to reduce viscosity and descaling and other factors.

  (1) Hard scales such as calcium carbonate and magnesium can be solved by soaking in hydrochloric acid. First, use steam or hot water to rinse the oil stains in the double vibrating tube, and then use a soft steel wire to check whether there is any hard object jamming on the inner wall, and peel off and collect a small amount of scale samples; configure the corresponding concentration of hydrochloric acid in the laboratory, and observe the reaction effect with the scale samples to determine the concentration of hydrochloric acid , and then block one end of the flange, pour the prepared solution from the other end and add a small amount of scale inhibitor hydrochloric acid. At this time, the reaction is violent and CO2 gas is ejected. Safety protection must be taken during the operation. The MVD junction box is wrapped in a plastic bag. Avoid water. During the period, the consumed hydrochloric acid should be replenished, and the remaining hydrochloric acid should be recovered after observing no reaction, and then rinsed with clean water. The simple way to verify the effect of pickling is to fill the Coriolis mass flowmeter sensor with clean water and connect it to a transmitter such as 3700. The instantaneous moisture content of about 100% is qualified, and an error of about 0.025% is allowed due to the influence of ambient temperature.

  (2) If the scale cannot be removed by soaking in hydrochloric acid solution, the content of barium sulfate and strontium sulfate in the scale is determined by X-ray diffractometer > 70%. This sulfate type scaling has a very low solubility product constant, which not only affects the normal use of the Coriolis mass flowmeter, but also affects storage and transportation facilities such as pipes and valves. It must be solved by a professional cleaning company, and only water can be used. Type compatibility and drug screening, rational drug addition and other measures to prevent.

  Okay, that’s about it for the details of the content. I don’t know if you have other different opinions on the content analysis of the editor above. The editor welcomes you to come and discuss with the editor at any time, learn more about flowmeters, and open more small series. ed unknown new territory. Pay attention to the editor, the content in the next issue will be more exciting.