Use of oil in water monitor for understanding water treatment


Mirmorax Oil in Water Monitors Reduce the Overall Oil Content in Discharge Water by More Than 30% on North Sea Field. Oil in Water Monitors Lower Oil Levels on Discharge Water to Increase Revenues.

Produced water has become the subject of an increasing operator focus in a number oil & gas applications today, as the output and results effect the environment, injection wells and the well’s production capabilities.

There is also an increased focus on water production today in oil sands and shale gas fields (in addition to more conventional fields) as water is becoming a scarce resource and recycling the water requires cost efficient and effective treatment systems.

Cost efficient treatment systems are key to allowing produced water to be discharged and regulatory requirements are set as to what content of oil particles are allowed. However, having control of your oil particle measurements is not only a matter of compliance, but is also strongly linked to water treatment capacity and loss of produced oil.


Mirmorax is optimizing the oil and water separation process by applying its Mirmorax Oil in Water monitors. By installing monitors upstream and downstream of the separator train, Mirmorax can develop operational procedures capable of increasing the water treatment capacity significantly without adding more treatment systems.

In a North Sea oilfield, for example, Mirmorax installed three Oil in Water monitors. Due to the optimizing of the separation process, the monitors managed to reduce the overall oil content in discharge water by more than 30%. As part of this project, expensive, service-intensive separation systems were removed and operational procedures with existing robust separation equipment were developed.


Another additional but less well understood motivation for optimizing production by applying the Mirmorax Oil in Water monitors is increased revenues. For example, the annual increased oil revenue for lowering oil ppm levels from 30 ppm to 20 ppm on discharge water for a large oil field producing 100,000 barrels of produced water a day will be 38,000 USD.  This alone will pay for the investment in the Oil in Water monitors over just a few years of operation. The Mirmorax Oil in Water monitors measure between 0-2500 ppm and have extremely high accuracy, even at lower ranges.


As many new wells are being tied into existing fields, the need for increased capacity in water treatment is a natural consequence. Using optimized separation techniques and operational procedures may very well be the most cost effective solution for handling the additional produced water, due to the increase in producing wells. Again, the Mirmorax Oil in Water is the answer.

The Mirmorax oil in water monitor also distinguishes between sand particles and oil particles. This ensures that there is no danger of counting sand as oil and allows the operator to identify the right particles to be removed, with others materials , such as sand and gas, then discharged without penalties.


Oil separation and water treatment is not suited to a laboratory with highly accurate instrumentation.  It’s about measuring real produced water under non-ideal conditions. This also includes allowing for changes in salinity and methanol present in the water without affecting measurements. Mirmorax Oil in Water monitors measure salinity, temperature and density accurately and hence compensate fully for any effects these substances may have on measurements. This is a new feature and ensures a stable ppm reading, regardless of field variations.

Salinity measurement is also a valuable source of data when determining the origin of water coming from multiple wells, and tie-ins. Information about salinity and density mix provides the operator with a good core measurement or verification of how much of the separation capacity is being used for each of the fields and, in addition, serves as a back-up verification of water break through.


Furthermore, in real process conditions, Oil in Water monitors also must withstand a certain level of contamination. Mirmorax’s new auto calibration feature allows for several millimeters of scale and oil to grow on the ultrasound transducer without affecting the accuracy. In addition, most Mirmorax Oil in Water applications do not need an active cleaning mechanism that can generate sound contamination and is also vulnerable to long-term damage.


Mirmorax’s new developments within our Oil in Water monitor technology are the result of customer input and are highly relevant for today’s operators. Our understanding of the water treatment process is not only based on years of field experience, but also is the result of working closely with customers to solve challenges and provide better solutions.  T
The results are solutions, such as the Mirmorax Oil in Water monitors, that are meeting today’s oil and water separation challenges head-on.

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Use of Oil in Water monitor for understanding water treatment