Measuring level of crude oil case study


MonoScan provides an economical ultrasonic solution for measuring level of crude oil in one of Kaliningrad's well known oil fields.

The Eastern Gorino oil field located in Gorino, Kaliningrad near the border of Lithuania, contains 11 oil wells and is capable of producing 200 tons of crude oil per day. The Kaliningrad Geological Oil & Gas company, which owns the field, sought a solution for measuring the level of the oil to improve the oil-water separation process in its vessels.

The Problems

Crude oil is naturally forced to the surface because it is under pressure in the reservoir. However, as the field gets older there is less pressure so water or gas has to be pumped down the injection wells to increase the pressure and force the crude oil up. What comes out of the well is a mixture of crude oil, gas and water and so needs to be separated before being transported to the refinery.

To store the oil that is being pumped up from the wells, The Gorino oil field uses cylindrical shaped tanks with a diameter of approx. 4m (13.2ft) and are positioned horizontally.

The oil field sought an ultrasonic solution to measure the level of the crude oil, and thus to enable an enhanced monitoring of the oil-water mixture in the tanks.

There are few problems that may be encountered using ultrasonic solution for this kind of application:

  • The presence of gas (even if limited) can cause a change in the sound velocity, which may result inaccurate readings.
  • The gassy environment in the tanks is highly explosive and therefore requires the equipment installed to be approved for installation in hazardous areas.
  • The tanks cylindrical shape may cause the ultrasonic beam to lose its target during the reading process, resulting in an echo loss.

 The solution

The Gorino decided to install four MonoScan L units on four of the cylindrical tanks. These MonoScan units are ATEX approved (EEx ia IIC T4) for installations in hazardous areas and therefore provide safety for the equipment installed in their proximity. Moreover, MonoScan is equipped with unique software that compensates for the changes in the sound velocity caused by the gas presence in the tanks. In addition, MonoScan has a built-in software algorithm that enables it to successfully cope with the cylindrical shape of the tanks and to provide accurate measurement results. Due to its mono-block design, MonoScan enables an effortless installation and fast set-up time. Moreover, measurement results can be viewed both locally on its LCD display and remotely through 4-20mA current.




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