Cargando…

Uncertainty Analysis of Fluorescence-Based Oil-In-Water Monitors for Oil and Gas Produced Water

Offshore oil and gas facilities are currently measuring the oil-in-water (OiW) concentration in the produced water manually before discharging it into the ocean, which in most cases fulfills the government regulations. However, as stricter regulations and environmental concerns are increasing over t...

Descripción completa

Detalles Bibliográficos
Autores principales: Severin Hansen, Dennis, Jespersen, Stefan, Bram, Mads Valentin, Yang, Zhenyu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7472087/
https://www.ncbi.nlm.nih.gov/pubmed/32784448
http://dx.doi.org/10.3390/s20164435
_version_ 1783578908427288576
author Severin Hansen, Dennis
Jespersen, Stefan
Bram, Mads Valentin
Yang, Zhenyu
author_facet Severin Hansen, Dennis
Jespersen, Stefan
Bram, Mads Valentin
Yang, Zhenyu
author_sort Severin Hansen, Dennis
collection PubMed
description Offshore oil and gas facilities are currently measuring the oil-in-water (OiW) concentration in the produced water manually before discharging it into the ocean, which in most cases fulfills the government regulations. However, as stricter regulations and environmental concerns are increasing over time, the importance of measuring OiW in real-time intensifies. The significant amount of uncertainties associated with manual samplings, that is currently not taken into consideration, could potentially affect the acceptance of OiW monitors and lower the reputation of all online OiW measurement techniques. This work presents the performance of four fluorescence-based monitors on an in-house testing facility. Previous studies of a fluorescence-based monitor have raised concerns about the measurement of OiW concentration being flow-dependent. The proposed results show that the measurements from the fluorescence-based monitors are not or insignificantly flow-dependent. However, other parameters, such as gas bubbles and droplet sizes, do affect the measurement. Testing the monitors’ calibration method revealed that the weighted least square is preferred to achieve high reproducibility. Due to the high sensitivity to different compositions of atomic structures, other than aromatic hydrocarbons, the fluorescence-based monitor might not be feasible for measuring OiW concentrations in dynamic separation facilities with consistent changes. Nevertheless, they are still of interest for measuring the separation efficiency of a deoiling hydrocyclone to enhance its deoiling performance, as the separation efficiency is not dependent on OiW trueness but rather the OiW concentration before and after the hydrocyclone.
format Online
Article
Text
id pubmed-7472087
institution National Center for Biotechnology Information
language English
publishDate 2020
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-74720872020-09-04 Uncertainty Analysis of Fluorescence-Based Oil-In-Water Monitors for Oil and Gas Produced Water Severin Hansen, Dennis Jespersen, Stefan Bram, Mads Valentin Yang, Zhenyu Sensors (Basel) Article Offshore oil and gas facilities are currently measuring the oil-in-water (OiW) concentration in the produced water manually before discharging it into the ocean, which in most cases fulfills the government regulations. However, as stricter regulations and environmental concerns are increasing over time, the importance of measuring OiW in real-time intensifies. The significant amount of uncertainties associated with manual samplings, that is currently not taken into consideration, could potentially affect the acceptance of OiW monitors and lower the reputation of all online OiW measurement techniques. This work presents the performance of four fluorescence-based monitors on an in-house testing facility. Previous studies of a fluorescence-based monitor have raised concerns about the measurement of OiW concentration being flow-dependent. The proposed results show that the measurements from the fluorescence-based monitors are not or insignificantly flow-dependent. However, other parameters, such as gas bubbles and droplet sizes, do affect the measurement. Testing the monitors’ calibration method revealed that the weighted least square is preferred to achieve high reproducibility. Due to the high sensitivity to different compositions of atomic structures, other than aromatic hydrocarbons, the fluorescence-based monitor might not be feasible for measuring OiW concentrations in dynamic separation facilities with consistent changes. Nevertheless, they are still of interest for measuring the separation efficiency of a deoiling hydrocyclone to enhance its deoiling performance, as the separation efficiency is not dependent on OiW trueness but rather the OiW concentration before and after the hydrocyclone. MDPI 2020-08-08 /pmc/articles/PMC7472087/ /pubmed/32784448 http://dx.doi.org/10.3390/s20164435 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Severin Hansen, Dennis
Jespersen, Stefan
Bram, Mads Valentin
Yang, Zhenyu
Uncertainty Analysis of Fluorescence-Based Oil-In-Water Monitors for Oil and Gas Produced Water
title Uncertainty Analysis of Fluorescence-Based Oil-In-Water Monitors for Oil and Gas Produced Water
title_full Uncertainty Analysis of Fluorescence-Based Oil-In-Water Monitors for Oil and Gas Produced Water
title_fullStr Uncertainty Analysis of Fluorescence-Based Oil-In-Water Monitors for Oil and Gas Produced Water
title_full_unstemmed Uncertainty Analysis of Fluorescence-Based Oil-In-Water Monitors for Oil and Gas Produced Water
title_short Uncertainty Analysis of Fluorescence-Based Oil-In-Water Monitors for Oil and Gas Produced Water
title_sort uncertainty analysis of fluorescence-based oil-in-water monitors for oil and gas produced water
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7472087/
https://www.ncbi.nlm.nih.gov/pubmed/32784448
http://dx.doi.org/10.3390/s20164435
work_keys_str_mv AT severinhansendennis uncertaintyanalysisoffluorescencebasedoilinwatermonitorsforoilandgasproducedwater
AT jespersenstefan uncertaintyanalysisoffluorescencebasedoilinwatermonitorsforoilandgasproducedwater
AT brammadsvalentin uncertaintyanalysisoffluorescencebasedoilinwatermonitorsforoilandgasproducedwater
AT yangzhenyu uncertaintyanalysisoffluorescencebasedoilinwatermonitorsforoilandgasproducedwater