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Clariant Oil Services Demulsifier Improves Separation Performance Reduces Cost

  • Achieved favorable BS&W and overboard oil-in-water levels
  • 25% Reduction of demulsifier chemical spend
  • Improved overall environmental performance
  • Outperformed existing product, continuously treating fluids at a steady rate of 95 ppm


A major offshore platform in the South China Sea was experiencing frequent, unstable interface and off-spec cargo oil problems. Clariant Oil Services was requested to identify a suitable chemical treatment program to resolve this problem.

The platform produces 23,000 bbls of crude per day and 260,000 bbls of water per day from 20 wells. The platform performs from a two-train process system, comprising of just one separator for each process. After separation on the platform, the fluids are transferred for further separation to an FPSO, containing two separators and one EDD. See Table 1 on page 2 for system conditions.

Table 1: System Conditions

Fluid temperature on platform 95°C 
Fluid temperature on FPSO 85°C 
Average crude API  26 

Clariant Oil Services Solutions and Value Delivered

After rigorous bottle testing and multiple successful field trials, Clariant Oil Services recommended its PHASETREAT® 6635 demulsifier as a suitable replacement for this oilfield. Results indicated that PHASETREAT 6635 exhibited outstanding performance, achieving favorable BS&W and final overboard oil-in-water levels.

PHASETREAT 6635 was injected into the manifold of the platform at a rate of 95 ppm, based on crude oil production, which was 25% less than the incumbent demulsifier. However, the incumbent was frequently increased during periods of high oil-in-water levels.

The application of PHASETREAT 6635 greatly improved operating performance. Clariant Oil Services’ PHASETREAT 6635 demulsifier provided a more than 25% reduction in chemical spend and improved the overall environmental performance. Furthermore, PHASETREAT 6635 continues to treat the fluids at a steady rate of 95 ppm, even during upset conditions.

This information corresponds to the present state of our knowledge and is intended as a general description of our products and their possible applications. Clariant makes no warranties, express or implied, as to the information’s accuracy, adequacy, sufficiency or freedom from defect and assumes no liability in connection with any use of this information. Any user of this product is responsible for determining the suitability of Clariant's products for its particular application.*Nothing included in this information waives any of Clariant’s General Terms and Conditions of Sale, which control unless it agrees otherwise in writing. Any existing intellectual/industrial property rights must be observed. Due to possible changes in our products and applicable national and international regulations and laws, the status of our products could change. Material Safety Data Sheets providing safety precautions, that should be observed when handling or storing Clariant products, are available upon request and are provided in compliance with applicable law. You should obtain and review the applicable Material Safety Data Sheet information before handling any of these products. For additional information, please contact Clariant. *For sales to customers located within the United States and Canada the following applies in addition: NO EXPRESS OR IMPLIED WARRANTY IS MADE OF THE MERCHANTABILITY, SUITABILITY, FITNESS FOR A PARTICULAR PURPOSE OR OTHERWISE OF ANY PRODUCT OR SERVICE.

Copyright © Clariant International Ltd, 2013.


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