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Evaluation of De-oiler Performance Using Numerical CFD Technique

Hariyanti, Yovita
Master thesis
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URI
https://hdl.handle.net/11250/2724901
Date
2020
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  • Master i teknologi [169]
Abstract
When producing oil from the reservoir, it comes together with water, gas, sand, and other

impurities. Excluding gas, all of them are unexpected waste. The water or simply called

produced water is the biggest problem due to its quantity and oil content. A produced

water treatment should be performed before it is discharged to the sea or re-injected into

the wells. External partner of this thesis, Subsea 7 is now developing a subsea separation

technology called SPU (Subsea Processing Unit). SPU consists of some separation units,

one of them is a de-oiler/hydrocyclone. This thesis will only focus on the de-oiler unit to

reduce oil concentration in the produced water to be under 20-30 ppmv.

A literature review is conducted to choose de-oiler geometry based on separation

efficiency. SALOME is used to draw and make a de-oiler mesh. The CFD simulation is

conducted using OpenFOAM with the Euler-Euler model. twoPhaseEulerFoam solver is

modified from its original example called bubbleColumn. The literature review has been

done to examine various geometry and types of de-oiler for oil and water. Based on

efficiency, the geometry for simulation is selected. From the results, the oil volume

fraction in the water is found to be high which leads to low efficiency. The pressure drop

is obtained to be very low compared to most of the literature, which is 0.02272 bar for

54.696 L/min and 0.0424 bar for 82.045 L/min. With the assumption of efficiency 76%,

the number of de-oilers needed to separate 60000-80000 barrels of produced water per

day varies between 25-162.
Publisher
University of South-Eastern Norway
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