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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If used, incoming emulsion is preheated by the heat of outgoing oil. Contact Us Subscribe to newsletter How to contribute? The objectives of the pilot-scale investigations were to determine sizing criteria for electrostatic treaters, provide operating guidelines, and identify the tolerance of these treaters to solids and gas upsets.

This arrangement utilizes one dump valve and level controller to maintain water ievels flectrostatic the treater. Proceedings of an international conference Diverless and Deepwater Techology: The lower grid is charged with 15, 20, volts of electricity while the upper grid is grounded.

If they remain off, the emulsion may cool so that it does not completely break up. The upper grid is grounded to the vessel shell and is adjustable so that the electrostatic field can be regulated to meet varying coalescing requirements. Both grids are suspended from the top of the vessel shell by insulated hanger rods. Electrostatic treating begins below the tretaer grid and is completed between the upper and lower grids where water droplets coalesce and settle out.

This is controlled by a float in the surge section which is mechanically linked to the oil dump valve. Oil, water, and gas discharge lines must be equipped with controls.

Electrostatic treaters

It then travels upward across the firetubes and spills over a weir into the surge ttreater. Gas, which has separated from the emulsion, rises to the top of the inlet section. By trial and error after installation, the electric grids may be able to allow treating to occur at lower temperatures.


The electrostatid water is drawn off below the firetube for additional reductions in thermal load and subsequent fuel gas requirements. A fused disconnect at the power source is recommended for maximum safety. The produced fluids enter the treater and any gas is vented.

As heated emulsion rises through the electrostatic field, water droplets are given an electrical charge, which causes them to become elongated and polarized. As they collide the droplets grow in size forming larger droplets, until they become large enough to settle. Since most emulsions being treated contain a certain amount of sludge and solids, the firetubes should be checked for corrosion, rust and accumulation of scale.

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.

Electrostatic Treaters Process | Oil and Gas Separator

Inside the treating section, a flow spreader ensures uniform distribution of emulsion. The inherent design features of the treater facilitate easy and reliable sand removal in both the horizontal and vertical configurations. If the electrical forces are higher than gravitational forces, settling of the water drops will be hindered. Centrifugal force creates a vortex and accentuates the separation effect. Electrostayic you find what you were looking for?

As the emulsion continues to rise, it flows through a spreader which disperses emulsion along the length of the firetubes.

Oil, which has separated from the water, rises to the top of the treating section. When the water level changes, these checks can be done to restore treated to the pre-set condition:.

The attraction force for droplets of equal sizes is expressed mathematically by. As the emulsion passes through the electrical field the water droplets in the emulsion become electrically charged and they move about rapidly and collide with one another. Most electrostatic treaters have a reac-tance type transformer which has a reactor to protect the transformer from power surges and high voltage dispersion. The oil-water emulsion then flows into the heating section of the treater. The lower grid is not ttreater and receives the electrical output from the transformer.


The flow path in an electrostatic treater is the same as a horizontal treater.

NATCO DUAL FREQUENCY Electrostatic Treater

Development of Design and Operating Guidelines. Several things happen as emulsion moves upward across the firetubes. Therefore, the treating process has already begun by the time the emulsion reaches the treater.

Oil level in the treating section is maintained by the oil dump valve, which is eoectrostatic by a float in the surge section. However, the savings in chemical with higher temperatures may be offset by the loss of revenue caused by gravity and volume losses in the oil and increased fuel costs. 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.

For smooth operation, the following maintenance checks should be performed as indicated:. Free water falls to the water section of the vessel and the emulsion rises to the coalescing section. When heating is required, lower temperatures can be used in electrostatic treaters than in conventional heater treaters. Adequate retention time is provided to ensure that the water settles and that the gas breaks out of the oil.

Emulsion enters the treater, splashes over the U-shaped hood or downcomer and flows down-ward to the bottom electrostatlc the vessel. Electrostatic Treater Operation are used for three-phase separation: