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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Procedures for designing electrostatic coalescers have not been published. Tretaer clean oil leaves the treating section unless an equal amount of fluid enters the surge section.
As rteater emulsion continues to rise, it flows through a spreader which disperses emulsion along the length of the firetubes. 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. The burner should come on and burn steadily for a long period of time rather than blasting on and off. In a water-in-oil emulsion with a high content of dispersed water, insulating the electrode may be necessary.
The flow path in an electrostatic treater is the same as a horizontal treater. Field experience tends to indicate that electrostatic treaters are efficient at reducing water content in the crude below the 0.
Electrostatic Treaters Process | Oil and Gas Separator
These transformers are oil-immersed and meet all reasonable electrical safety requirements. Log in to your subscription Username.
This is achieved by the level controller diverting gas or compressed air to the diaphragm of the dump valve. Rock Mechanics Symposium and 5th U. Electrostatic Treater Operation are used for three-phase separation: Since coalescence of droplets in an electric field is so dependent. Water levels are pre-set. 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.
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. 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.
Since coalescence of droplets in an electric field is so dependent on the characteristics of the particular emulsion to be treated, it is unlikely that a general relationship of water droplet size to use in the settling equations can be developed. Gas, which has separated from the emulsion, rises to the top of the inlet section. The inherent design features of the treater facilitate easy and reliable sand removal in both the horizontal and vertical configurations.
Khatib Shell Oil Co.
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 they collide the droplets grow in size forming larger droplets, until they become large enough to settle.
It is in this section that final treating and settling takes place. When the emulsion returns to the pre-set level, the dump valve closes and allows oil to accumulate in the treating section. Adequate retention time is provided to ensure that the water settles and that the gas breaks out of the oil. Since most emulsions eleectrostatic treated contain a certain amount of sludge and solids, the firetubes should be checked for corrosion, rust and accumulation of scale.
The electrical system consists of a step-up transformer and two electrical grids electrodes. Proceedings of an International Conference Submersible Technology: Therefore, the treating process has already begun by the time the emulsion reaches the treater. Oil, water, and gas discharge lines must be equipped with controls.
If they remain off, the emulsion may cool so that it does not completely break up. The lower grid is not grounded and receives the electrical output from the transformer.
Electrostatic Treaters Process
By posting, you agree to be identified by your IP address. If they fail to function properly, the burners could elecyrostatic off or on all the time. The free water is drawn off below the firetube for additional reductions in thermal load and subsequent fuel gas requirements.
Most free water in the emulsion quickly settles out and the electroetatic lighter liquids move upward through the water, which serves as a heated wash. Step-up transformers increase the incoming voltage to a higher level, e. Some treaters use an electrode section.
Electrostatic treating begins below the lower grid and is completed between the upper and lower grids where water droplets coalesce and settle out. Emulsion enters the treater, splashes over the U-shaped hood or downcomer and flows down-ward to the bottom of the vessel.