In the process of oil extraction, the crude oil usually extracted from the ground contains water or salt, and with the increase of the mining life and water injection development, the water production of the oil well will continue to increase until the extraction loses its economic value and the oil well is abandoned. If the crude oil is not dehydrated during the production process, on the one hand, the high water content will increase the equipment capacity of crude oil in the process of production, storage and transportation, and increase the cost in the development process; on the other hand, it cannot meet the user's water content requirements. . If the user's requirements are not met, the selling price of crude oil will be reduced or the market competitiveness of the crude oil product will be lost. The ultimate purpose of dehydration is to separate the sewage and impurities in the oil-water mixture to obtain qualified commercial crude oil and meet the water content standard for crude oil sales. Common crude oil dehydration methods mainly include: gravity sedimentation, heating sedimentation, chemical dehydration, electrical dehydration and electrochemical dehydration. These several dehydration methods are used in the development of offshore oil fields, and in most cases, two or more methods are used in combination. The specific process and method to be used can be determined through experiments and technical and economic comparisons according to the properties of the oil, water content and emulsification degree, and the specific conditions of the oilfield engineering program. Electrochemical dehydration has been widely used in offshore oilfields due to its strong demulsification ability, high dehydration efficiency and small footprint.
The pulse electric dehydration technology of Luoyang Zhengyuan Petrochemical Co., Ltd. has obtained a number of national patent technology certificates. Has the following characteristics:
(1) Power saving and low energy consumption
The output voltage of the pulse electric dehydration transformer is a pulse square wave, which is an intermittent power supply mode, which reduces the power-on time and reduces the dehydration power consumption.
(2) Efficient demulsification and fast oil-water separation
The high-voltage pulse can obtain the instantaneous high voltage between the plates without short-circuiting. The oil-water emulsified particles are polarized and coalesced under the instantaneous high pressure. The coalescing force is more than ten times higher than that of the conventional electric dehydration. The emulsification membrane is ruptured, the demulsification ability is strong, and it has the characteristics of efficient demulsification and fast separation of oil and water.
(3) Improve the stability of the electric desalination device
With pulse power supply, the power supply can be terminated briefly before water ripples are formed to avoid short circuits. After the short circuit disappears, adding another pulse can avoid the leakage of electric energy and improve the stability of the electric dehydration device.
(4) Reduce the dosage of demulsifier
The electric field strength between the plates is improved, the collision and aggregation of water droplets is accelerated, the oil-water separation efficiency is improved, and the amount of the demulsifier can be reduced.
