Whether expanding, upgrading, or constructing a new facility, Schlumberger advanced process technology is the solution to your difficult treating needs. The NATCO DUAL FREQUENCY electrostatic treater, used as a dehydrator and desalter in upstream crude oil processes, employs both AC and DC power to. Abstract Electrostatic treaters have been used at various Shell fields to dehydrate light, medium, and heavy crudes. The performance and operating envelope of.

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Some treaters have a heat exchanger installed on the inlet line. Did you find what you were looking for? However, for normal crude treating, where 0. The electrical system consists of a step-up transformer and two electrical grids electrodes. Free water falls to the water section of the vessel and the emulsion rises to the coalescing section.

Electrostatic treaters treaterr similar to horizontal heater treaters in design and operation.

The upper grid is grounded to the vessel electrostatix and is adjustable so that the electrostatic field can be regulated to meet varying coalescing requirements. This makes them particularly attractive for desalting applications.

The free water is drawn off below the firetube for additional reductions in thermal load and subsequent fuel gas requirements. The oil-water emulsion then flows into the heating section of the treater.

Leave a Comment Cancel reply Your email address will not be published. Since electrostatic treaters operate under pressure, they should be equipped with pressure relief devices that have enough capacity to protect the treater if pressure increases. As the emulsion continues to rise, it flows through a spreader electrostqtic disperses emulsion along the length of the firetubes. Several things happen as emulsion moves upward across the firetubes.

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The burner should come on and burn steadily for a long period of time rather than blasting on and off.

This is controlled by a float in the surge section which is mechanically linked to the oil dump valve. From the spreader emulsion rises upward toward the high-voltage, alternating-current, electrical grids. Electrostatic treaters are used for three-phase separation: Electrostatic Treater Operation are used for three-phase separation: The burner flame should aim straight down the center of the firetube.

A gas equalizer pipe allows the gas from both sides of the baffle to be equalized, gathered, and removed from the vessel through the gas outlet. Oil, which has separated from the water, rises to the top of the treating section.

Emulsions and Electrostatic Treater Principles | SCIENCE PARK

Introduction Electrostatic dehydration of light, medium, and heavy crudes has been used at various Shell fields, particularly in the Gulf of Mexico, Electrostahic Texas, and California.

Ina pilot-scale Chem-Electric Treater PSCET was built 1 to address the operating problems encountered in dehydrating heavy crudes, 2 to investigate electrostatic dehydration of light and medium crude, and electrsotatic to provide a broad data base for various crudes.

The type of valves and controls used varies depending on the treater construction. Both water dump valves operate by means of Interface level controllers which use gas or compressed air to open and close the dump valves. Procedures for designing electrostatic coalescers have not been published.

When emulsion rises above a pre-set level in the surge section, the float rises with the emulsion and causes the dump valve to open, which allows oil to leave the vessel.


No clean oil leaves the treating section unless an equal amount of fluid enters the surge section. The lower grid is not grounded and receives the electrical output from the electrostatoc.

Electrostatic treater

The lower grid is charged with 15, 20, volts of electricity while the upper grid is grounded. Contact Us Subscribe to newsletter How to contribute? In a water-in-oil emulsion with a high content of dispersed water, insulating the electrode may be necessary. As heated emulsion rises through the electrostatic field, water droplets are given an electrical charge, which causes them to become elongated and polarized.

The attraction force for droplets of equal sizes yreater expressed mathematically by where K is the dielectric constant, Electrostatid is the electrical gradient, d is the drop radius, and D is the distance between droplet centers.

NATCO DUAL POLARITY Electrostatic Treater | Schlumberger

Gas leaving at the top of the treater is controlled by a gas back-pressure valve which controls the pressure in the treater. As with the oil dump valve, water dump valves open to remove water when the interfaces rise above pre-set levels and close when the interfaces return to pre-set levels.

This paper 1 presents the observations made based on the pilot tests and discusses their significance in establishing the operating envelope and practices for electrostatic treaters, 2 describes the design of a novel inlet spreader, 3 summarizes the performance of electrostatic treaters in two fields, and 4 provides several operating practices and correlations that can be used to predict performance.

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