Quick electrostatic agglomerate separating device and process

Abstract

The invention provides a quick electrostatic agglomerate separating device and a quick electrostatic agglomerate separating process. The quick electrostatic agglomerate separating device is composed of a pry seat, an oil-water separation tank, an oil-water interface instrument, a water outlet, a gas-liquid separation tank, a liquid inlet, a gas outlet, a pressure gauge, a gas-liquid interface instrument, an adsorption plate, a water outlet, an oil / water transmission pipe, an oil outlet, a transformer, a transformer, a control cabinet, a high pressure introduction hole, a feed oil distributor, an electrostatic coalescence electrode and a discharged oil collecting pipe; a high water cut well liquid enters the gas-liquid separation tank via the liquid inlet; a combustible gas is discharged from the gas outlet and enters the oil-water separation tank; oil and water are separated from each other under the action of gravity, and further separated in an electric field generated by the electrostatic coalescence electrode; and crude oil is output from the oil outlet. Therefore, the problems of low crude oil dehydration rate, high oil content in drainage and high energy consumption are solved, the electric field space is extended and the dehydration time of crude oil in the electric field is prolonged; and as the result, the dehydration efficiency is effectively improved, the electricity consumption in operation is reduced and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of crude oil-water separation, in particular to an electrostatic coalescence rapid separation device and process. Background technique [0002] In recent years, as most oilfields in China have entered the late stage of production, on the one hand, the water content of the produced fluid has increased. For example, the maximum water content of the produced fluid in Gudao Oilfield has reached 98%, and the water content of the produced fluid in some offshore oilfields can reach 99%. On the one hand, the trend of crude oil becoming heavier and inferior in the late stage of exploitation is becoming more and more obvious. For example, the highest density of crude oil in Tahe Oilfield has exceeded 1g / cm3, and the density of Shengli ultra-heavy oil has also exceeded 1g / cm3: In addition, during the deep mining process The extensive use of oil recovery additives has led to serious oil-water emulsification of the produ...

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Problems solved by technology

[0002] In recent years, as most oilfields in China have entered the late stage of production, on the one hand, the water content of the produced fluid has increased. For example, the maximum water content of the produced fluid in Gudao Oilfield has reached 98%, and the water content of the produced fluid in some offshore oilfields can reach 99%. On the one hand, the trend of crude oil becoming heavier and inferior in the late stage of exploitation is becoming more and more obvious. For example, the highest density of crude oil in Tahe Oilfield has exceeded 1g / cm3, and the density of Shengli ultra-heavy oil has also exceeded 1g / cm3: In addition, during the deep mining process The extensive use of oil recovery additives has led to serious oil-water emulsification of the produced fluid in many oilfields, which has brought many problems to conventional oil-water separation: (1) The operation of electric dehydration equipment is unstable. Due to the high water content of the produced fluid, poor properties and serious emulsification, After conventional oil-water separation, the water content may be high, and entering the electric dehydration equipment will cause the current to rise or even trip, which will affect the safe and stable operation of the electric dehydration equipment. At the same time, high current will increase the power consumption of the electric dehydration equipment; (2) equipment level Large number, large area and high investment. Due to the low efficiency of conventional oil-water separation equipment, multi-stage separation is required to meet the water content requirements of crude oil, which will inevitably lead to more equipment, larger occupied area, and increased operation and maintenance costs; (3 ) Environmental protection pressure is high, crude oil is inferior and the application of oil production additives leads to serious emulsification of crude oil production fluid, and conventional oil-water separation effect is poor, which will lead to excessive oil content in drainage water, which will bring great pressure to sewage treatment and environmental protection

[0003] Electrostatic coalescence dehydration technology is the most effective separation technology for oil-water emulsion, and has been widely used in the field of oil-water separation. However, traditional electrostatic coalescence technology uses bare metal electrodes. Although it can achieve a good dehydration effect for crude oil with low water content, the It can no longer adapt to the changing needs of the current oilfield crude oil water content, crude oil properties and mining methods

[0004] The patent document with the application number 92208130.1 discloses a downhole oil-water separation and production device. The equipment consumes a lot of power during operation. After oil-water separation of high-water content well fluid, the water content is large and pollutes the environment.

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