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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The produced fluids enter the treater and any gas is vented.

Electrostafic retention time is provided to ensure that the water settles and that the gas breaks out of the oil. The electrostatic grid polarizes the conductive water molecules thereby forcing them to coalesce into larger particles and settle out of the crude. The free water is drawn off below the firetube for additional reductions in thermal load and subsequent fuel gas requirements.

The burner flame should aim slectrostatic down the center of the firetube.

NATCO DUAL POLARITY Electrostatic Treater

It then travels upward across the firetubes and spills over a weir into the surge section. Some electrostatic treaters are designed to allow water in the inlet section to join water in the treating seciion before being removed from the treater. Free water and treated water levels in the treater are maintained by water electroztatic valves.

Operating temperature is important and will vary from lease to lease. Gas, which has separated from the emulsion, rises to the top of the inlet section.

Did you find what you were looking for? Several things happen as emulsion moves upward across the firetubes. By trial and error after installation, the electric grids may be able to allow treating to occur at lower temperatures.

NATCO DUAL FREQUENCY Electrostatic Treater

From the spreader trexter rises upward toward the high-voltage, alternating-current, electrical grids. A fused disconnect at the power source is recommended for maximum safety. 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.


Free gas is released as emulsion strikes the hood or down-comer and rises to the top of the inlet section. Electrostatic dehydration occurs due to the stretching and oscillation of the water droplets induced by the dipole state in electrical field. A circuit breaker, located between the power source and the transformer, protects the transformer from electrical power failures.

Firetubes should be inspected at periodic intervals. Proceedings of an international conference Diverless and Deepwater Techology: Rock Mechanics Symposium and 5th U. Leave a Comment Cancel reply Your email address will not be published. Dehydration of Crude Using Electrostatic Treaters: In a water-in-oil emulsion with a high content of dispersed water, insulating the electrode may be necessary.

Gas leaving treaterr the top of the treater is controlled by a gas back-pressure valve which controls the pressure in the treater. This is controlled by a float in the surge section which is mechanically linked to the oil dump valve.

If the burners remain on, the treater may overheat and be damaged, the lighter ends of the oil may be cooked off changing gravity, and oil volume will be decreased resulting in lost revenue.

Both grids are suspended from the top of the vessel shell by insulated hanger rods. An increase in the electric gradient could cause rapid response, but it also tends to suspend the droplets along field lines. Emulsion enters the treater, splashes over the U-shaped hood or downcomer and flows down-ward to the bottom of the vessel. The maximum working pressure for a treater can be found on the manufacturer’s information plate attached to the treater.

Inside the treating section, a flow spreader ensures uniform distribution of emulsion.

Emulsions and Electrostatic Treater Principles | SCIENCE PARK

Figure illustrates a typical design of a horizontal electrostatic treater. Recommended steps for safely lighting a gas-fired electrostatic treater. Alternating current on the lower electrical grid GRIDS causes it to reverse polarity change from positive to negative times per second or 60 cycles per second.


Procedures for designing electrostatic coalescers have not been published. About us Contact us Help Terms of use. The water droplets coalesce into larger droplets and settle to the bottom of the treating section for removal.

The main difference between the two units is the electric coalescing section in the electrostatic treater which replaces the hay section in the heater treater.

Electrostatic Treater Operation | SCIENCE PARK

In some instances the emulsion will break without heat being applied to the emulsion. It is in this section that final treating and settling takes place. Sheriff’s Encyclopedic Dictionary of Applied Geophysics, fourth edition. Therefore, the firetubes need to eectrostatic less heat.

Some treaters have a heat exchanger installed on the inlet line.

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 electrostayic to provide a broad data base for various crudes. When the water level electorstatic, these checks can be done to restore it to the pre-set condition:.

Other types of oil and water dump valves may be used on electrostatic treaters. However, for normal crude treating, where 0. Introduction Electrostatic dehydration of light, medium, and heavy crudes has been used at various Shell fields, particularly in the Gulf of Mexico, West Texas, and California. A clean oil col-lection header skims off the clean oil for removal from the treater.

Treaters Water Separator Droplet Size. Electrostatic Treater Operation are used for three-phase separation: Peer reviewed only Published between: Heated emulsion rises and spills over a weir out of the inlet section.

Proceedings of an international conference Subsea Controls and Data Acquisition ‘ The electrical system consists of a step-up transformer and two electrical grids electrodes.

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