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Experimental and numerical investigation of oil-water dispersions - Eksperimentell og numerisk analyse av olje-vann dispersjoner

Tresvik, Karoline Langøy
Master thesis
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URI
http://hdl.handle.net/11250/2412654
Date
2016
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  • Institutt for energi og prosessteknikk [3297]
Abstract
Crude oil in the reservoir is accompanied by formation water. Separating water from

oil offshore before transporting it is necessary. This requires compact and robust separators. In order to optimize the design of separators, a good understanding of separation

mechanisms and crude oil behavior is essential. Testing separation with batch tests

compared to continuous flow tests is less time assuming and less expensive. This work

has been dedicated to gain knowledge about batch settling, through experimental and

numerical investigation. Separation experiments with Exxsol D60, water and Span 80

have been carried out. Testing with model oil instead of crude oil is beneficial. The

ultimate goal is to simulate crude oil and water emulsions using a model fluid systems.

Numerical simulations of mixing performance were performed as an optimization study

before batch testing. They showed that both rotation and the presence of static baffles

improve the mixing significantly. The experimental batch tests was performed with different

concentrations of Span 80, different water cuts and different rotations. The result

showed that Span 80 can be used as a surfactant to stabilize model oil. Investigation

of what affects the stability the most was done. Rotation proved to have the greatest

effect. Span 80 concentrations of 0.05-0.2 vol.% showed small changes on the stability.

It is suspected that these concentrations are too high, and that Span 80 should be estimated

with respect to oil volume instead of total volume. Polderman s model was used

to connect batch data with flowing systems. Fluxes based on the batch result were plotted,

and showed promising result which indicates that model oil can be used to simulate

crude oil. Experiments with the same fluid system were performed in a flowing rig. The

purpose was to investigate if these tests provided the same stability result. This resulted

in a stable emulsion, which prevented further flow tests. This may be because of a too

high Span 80 concentration.
Publisher
NTNU

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