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The "Performance Enhancing Coalescence Technology", the PECT range is a technology concept unique to Cyclotech. The first commercialised technology in this range is the PECT-"F", denoting a fibre-based Coalescer concept.
The PECT-F® System has been developed to improve significantly the performance of produced water Deoiling Hydrocyclone systems. The technology is aimed at existing systems which do not meet current legal or stretch targets for discharge, or require excessive chemical dosing to do so. It is also applicable to new-build systems where the application of Hydrocyclones is potentially marginal due to difficult fluid characteristics.
summary of benefits:
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Improves oil removal of existing Deoiling Hydrocyclones by up to 80% |
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Increases turndown of Deoiling Hydrocyclones by maintaining high efficiency at low flowrates. |
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Low pressure drop < 0.5 bar, (7 psi) |
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Eliminates or reduces reliance on water clarifier chemicals. |
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Extends applicability of Deoiling Hydrocyclone systems to heavy oil, condensate and other marginal applications . |
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Easily retrofitted into existing Deoiling Hydrocyclone systems without vessel or pipework modifications. |
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Low cost solution compared to other additional equipment. |
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Requires neither control nor external power. |
Deoiling Hydrocyclones have steep droplet cut size curves. A typical performance curve for a high efficiency Hydrocyclone shows that a small increase in the inlet droplet size significantly increases the separation performance - in our example below, an increase in the drop size from 5 to 10 microns increases the separation efficiency of the droplet from 15% to over 90%.
Deoiling Hydrocyclone Separation Efficiency |
 Click image to enlarge |
The inlet chamber of a conventional Deoiling Hydrocyclone vessel is commonly the largest chamber in the vessel with typical residence times of up to 20 seconds. PECT-F® technology involves the installation of low density coalescing internals into the inlet chamber of the vessel so as to use this residence time constructively to promote the modest levels of droplet growth required to improve the Hydrocyclone performance.
Key features of low media density and optimised flow distributionachieve the key objectives of modest coalescence with a low susceptibility to solids blockage.
The PECT-F® System is supplied as a cartridge-style insert that can be fitted in to all types of produced water Hydrocyclone vessel configurations. It is particularly suitable for retro-fit applications as no pipework or vessel modifications are required, and importantly no hot work is required. As a passive device it requires no valving or control systems, no external power. As PECT-F® is often installed inside existing equipment there are no additional space requirements, and very little increase in system weight, complexityand maintenance requirements.
Since its introduction in 1999, many field evaluations of the PECT-F® have been carried out. Typical reductions in oil content in the clean water leaving the Hydrocyclones has ranged from 30% to as much as 80%. Successful tests have been carried out on gas-condensate, medium and heavy oil applications.
Increases in dispersed oil droplet size have been spectacular and one obvious benefit to simplifying the separation application through droplet growth is that of much improved turndown characteristics for the Hydrocyclone. This is illustrated by the nsensitivity of water quality to variation in flowrate.
deoiling hydrocyclone turndown
in difficult application |
 Click image to enlarge |
Lower flowrate through the Hydrocyclones can cause a very significant tail off in separation, particularly in difficult applications. With PECT-F® installed, low flowrates actually result in increased contact time in the Coalescer, promoting further droplet growth and offsetting the impact of low flowrate on Hydrocyclone performance.
contact us if :
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You have a poorly performing Deoiling Hydrocyclone (or other technology) system. |
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You are proposing a difficult application for Deoiling Hydrocyclone treatment. |
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You are trying to achieve stretched targets for produced water discharge. |
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You are trying to reduce deoiling chemical usage. |
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You are trying for a fast track, low cost solution. |
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