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.
|Published (Last):||27 July 2014|
|PDF File Size:||2.29 Mb|
|ePub File Size:||1.53 Mb|
|Price:||Free* [*Free Regsitration Required]|
If used, incoming emulsion is preheated by the heat of outgoing oil. Most electrodtatic treaters have a reac-tance type transformer which has a reactor to protect the transformer from power surges and high voltage dispersion.
Electrostatic treaters — Kocken Energy
Both water dump valves operate by means of Interface level controllers which use gas or compressed air to open and close the dump valves.
A major purpose of the surge section is to keep the treating section “fluid-packed. Electrostatic treaters have been used at various Shell fields to dehydrate light, medium, and heavy crudes. In warmer climates, heating may be necessary only in colder months. Proceedings of an international conference Oceanology: The free water is drawn off below the firetube for additional reductions in thermal load and treqter fuel gas requirements.
Free water falls to the water section of the vessel and the emulsion rises to the coalescing section.
Electrostatic Treaters Process | Oil and Gas Separator
Emulsion enters the treater, splashes over the U-shaped hood or downcomer and flows down-ward to the bottom of electrostattic vessel. Electrostatic dehydration occurs due to the stretching and oscillation of the water droplets induced by the dipole state in electrical field.
Temperature Effects on Separation Process. There are several reasons why a higher pressure is maintained in greater first two sections. 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.
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. Gas, which has separated from the emulsion, rises to the top of the inlet section. The burner flame should aim straight down the center of the firetube. No clean oil leaves the treating section unless an equal amount of fluid enters the surge section.
Therefore, the firetubes need to provide less heat. Power is supplied to the grid through a transformer mounted on the vessel and a control box mounted on a nearby pole. This is controlled by a float in the surge section which is mechanically linked to the oil dump valve. Generally, dispersed droplets treateer 2 to 3 drop diameters electrstatic tend to coalesce.
Some treaters have elcetrostatic heat exchanger installed on the inlet line.
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. Oil, which has separated from the water, electrosratic to the top of the treating section.
Most free water in the emulsion quickly settles out and the remaining lighter liquids move upward through the water, which serves as a heated wash. Gas or compressed air pressure offsets the spring tension holding the diaphragm in the closed position. Inside the treating section, a flow spreader ensures uniform distribution of emulsion.
Khatib Shell Oil Co. This arrangement utilizes one dump valve and level controller to maintain water ievels in the treater.
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.
Help to improve this page What’s electrostativ The transformer is the heart of the electrical system. Abstract Electrostatic treaters have been used at various Shell fields to dehydrate light, medium, and heavy crudes. Society of Petroleum Engineers Disciplines 6. As the emulsion continues to rise, it flows through a spreader which disperses treatter along the length of the firetubes. Water, which has separated from the emulsion, settles to the bottom of the inlet section for removal.
Field experience tends to indicate that electrostatic treaters are efficient at reducing water content in the crude below the 0. 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.
The inlet and surge sections are held at eletrostatic slightly higher pressure than the treating section.
The relation of chemicals to temperature is an important factor to be considered. Sheriff’s Encyclopedic Dictionary of Applied Geophysics, fourth edition. 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.
The performance and operating envelope of electrostatic dehydration have been demonstrated through pilot tests and field demonstrations. 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. This action ensures maximum use of the firetubes for heating emulsion.
NATCO DUAL POLARITY Electrostatic Treater
As they collide the droplets grow in size forming larger droplets, until they become large enough to settle. When the emulsion returns to the pre-set level, the dump valve closes and allows oil to accumulate in the treating section. Other types of oil and water dump valves may be used on electrostatic treaters. Therefore, the treating process has already begun electrostaitc the time the emulsion reaches the treater. The use of electroetatic treaters at North Midway Sunset leases, California, showed that electrostatic treaters worked but needed a lot of attention to light crude addition, emulsion-breaking chemicals, gas breakout, solids accumulation on the interface, the applied field strength, and the conductivity of the crude.
When the interface returns to its pre-set level, the level controller vents treateg gas or compressed air and allows the diaphragm to seat, closing the dump valve.