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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This makes them particularly attractive for desalting applications.
If used, incoming emulsion is preheated by the heat of rteater oil. Proceedings of an international conference Oceanology: Electrostatic treaters have been used at various Shell fields to dehydrate light, medium, and heavy crudes. Advanced search Show search help. Electrostatic treaters are similar to horizontal heater treaters in design and operation. 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.
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.
Figure illustrates a typical design of a horizontal electrostatic treater.
The two grids are suspended one above the other in the treating section. The firetubes heat the emulsion which aids in separation of oil and water. The oil-water emulsion then flows into the heating section of the treater. Adequate retention time is provided to ensure trester the water settles and that the gas breaks out of the oil. The burner should come on and burn steadily for a long period of time rather than blasting on and off.
The operating temperature of the electrostatic treater is normally lower than that of the heater treater. Field experience tends to indicate that electrostatic treaters are efficient at reducing water content in the crude below the 0. 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. Trewter fluid temper-ature gets below this level, the grids will not have the proper treating effect on the emulsion.
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 3 to provide a broad data base for various crudes.
Electrostatic Treater Operation | SCIENCE PARK
Water levels are pre-set. 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.
Abstract Electrostatic treaters have been used at various Shell fields to dehydrate light, medium, and heavy crudes. By trial and error after installation, the elextrostatic grids may be able to allow treating to occur at lower temperatures.
This is because the high water content tends to produce over-stressing of the electrical coalescer due to a direct conductive path between the electrodes, which can cause the grid to leectrostatic out and become non-functional. The burner flame should aim straight down the center of the firetube. As heated emulsion rises through the electrostatic field, water droplets are given an electrical charge, which causes them to become elongated and polarized.
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This action lifts the diaphragm and allows water to flow through the dump valve. Publishers Content Coverage Privacy.
Step-up transformers increase the incoming voltage to a higher level, e. This causes the water droplets to move around rapidly and collide with each other with enough force to break the thin film surrounding each droplet.
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. All components of the electrical system are designed for high voltage service. Firetubes should be inspected at periodic intervals. The attraction force for droplets of equal sizes is expressed mathematically by.
Emulsions and Electrostatic Treater Principles | SCIENCE PARK
The produced fluids enter the treater and any gas is vented. Sheriff’s Encyclopedic Dictionary of Applied Geophysics, fourth edition. 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. It then travels upward across the firetubes and spills over a weir into the surge section.
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. The type of valves and controls used varies depending on the treater construction.
Mechanically operated oil dump valves and gas-operated water dump valves have been discussed in this manual.