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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An increase in the electric gradient could cause rapid response, but it also tends to suspend the droplets along field lines. It is in this section that final treating and settling takes place. The operating temperature of the electrostatic treater is normally lower than that of the heater treater. Peer reviewed only Published between: All components of the electrical system are designed for high voltage electrostwtic.
Electrostatic Treater Operation are used for three-phase separation: Free water and treated water levels in the treater are maintained by water dump valves. An electrical grid installed in the coalescing section with volt alternating electric current produces an electrical field in the coalescing section as electric current electrotsatic through the grid.
Here the free gas is spun upwards out the center of the vortex and the liquid emulsion flows downward and exits below the fire-tube in the free-water knock-out section of the treater. Gas leaving at the top of the treater is controlled by a gas back-pressure valve which controls the pressure in the treater. 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.
Usually less chemical is required to treat a warm emulsion. 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. Some electrostatic terater are designed to allow elfctrostatic in the inlet section to join water in the treating seciion before being removed from the treater.
Teeater electrostatic treaters have a reac-tance type transformer which has a reactor to protect the transformer from power surges and high voltage dispersion.
NATCO DUAL FREQUENCY Electrostatic Treater | Schlumberger
The electrostatic grid polarizes the conductive water molecules thereby forcing them to coalesce into larger particles and settle out of the crude. It then travels upward across the firetubes and spills over a weir into trfater surge section. The heated oil-water emulsion then flows through the coalescing section of the Treater and into the water settling zone for the final stage of oil-water separation. 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.
Inside the treating section, a flow spreader ensures uniform distribution of emulsion. Abstract Electrostatic treaters have been used at various Shell fields to dehydrate light, medium, and heavy crudes. Emulsion enters freater inlet section at the top of the unit and falls to the bottom of the vessel. Electrostatic treaters operate under working eoectrostatic of 5 to 50 psi.
This makes them particularly attractive for desalting applications. Free water falls to the water section of the vessel and the emulsion rises to the coalescing section. Ina pilot-scale Chem-Electric Treater Elsctrostatic 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. The flow path in an electrostatic treater is the same as a horizontal treater.
This is controlled by a float in the surge section which is mechanically linked to the oil dump valve. Generally, the voltage limits lie between 12 and 23 kV with variance being inversely proportional to crude gravity and conductivity of the treated emulsion.
If it hits the firetube directly, a hot spot will form and premature firetube failure will occur. This action ensures maximum use of the firetubes for heating emulsion. 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. Operating temperature is important and will vary from lease to lease.
Proceedings of an International Conference Submersible Technology: By posting, you agree to be identified by your IP address. The lowest possible temperature to adequately treat the emulsion should be used. This action lifts the diaphragm and allows water to eoectrostatic through the dump valve. The burner should come on and burn steadily for a long period of time rather than blasting on and off.
Figure illustrates a typical design of a horizontal electrostatic treater. Since coalescence of droplets in an electric field is so dependent. The liquid passes over the fire treeater and is heated if heat is applied. Electrostatic treaters are similar to horizontal heater treaters in design and operation.
A clean oil col-lection header skims off the clean oil for removal from the treater. In warmer climates, heating may be necessary only in colder months.
Some treaters have a heat exchanger installed on the inlet line. Therefore, the treating process has already begun by the time the emulsion reaches the treater. When the water level changes, these checks can be done to restore it to the pre-set condition:.
An oil-water emulsion enters the treater flowing through an integral inlet heat exchan- ger where it is preheated thereby reducing the thermal load on the firetube and reducing fuel gas consumption. 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.
Temperature controls or thermostats are an important part of any emulsion treater. Did you find what you were looking for? Treaters Water Separator Droplet Size.
Leave a Comment Treaer reply Your email address will not be published. Rock Mechanics Symposium and 5th U. Therefore, the firetubes need to provide less heat.