Method for processing oil emulsion of intermediate layers

FIELD: oil industry.

SUBSTANCE: method includes feeding oil emulsion to reservoir with flow 0,5-1 m3/hour through layer of drain water of same oil deposit with mineralization less than saturation limit at temperature 20-30°C and bed thickness of drain water 6-8 m. in reservoir oil is separated and directed to inlet of oil preparation plant.

EFFECT: higher efficiency, broader functional capabilities.

1 ex

 

The invention relates to the oil industry and can be used in the dehydration and desalting oil emulsion intermediate oil layer formed in the settling tanks and apparatus oil treatment plants.

A known method of removing chlorine-containing compounds from petroleum, including leaching oil emulsion of water and an aqueous solution of alkali on elektroobessolivaniya installation in few steps at elevated temperatures. And washing with an aqueous solution of alkali is carried out at a temperature of 30-80°With higher than prior to washing with water (patent RF №2065477, publ. 1996.08.20).

The known method requires the use of elevated temperatures. In the absence of demulsifiers method does not allow you to destroy persistent oil emulsion intermediate layers.

Closest to the invention to the technical essence is a method of preparing oil, including measurement of the volume of the emulsion from wells, gas separation, introduction of demulsifier in the pipeline, diverting the emulsion from the measuring unit to the separator, separating the free formation water from the sump and the oil through the deep dehydration and desalting by adding hot water to the emulsion and dispersing it with subsequent separation and separation of phases. The demulsifier is injected in two stages, half the n is rmative. The second half is injected into the preparation of the oil in the dispersion of the emulsion creating a circular circulation pump-sump, which also introduce hot water. The oil preparation is carried out not less than two tanks, providing a continuous flow of emulsion from wells. Phase separation in a settling tank before and after the dispersion is carried out in the mode of thermal forcing (RF patent №2153382, publ. 2000.07.27 - prototype).

The known method does not allow enough successfully isolate the oil from the oil emulsion intermediate layers. The yield of oil is not more than 50%.

The invention solves the problem of increasing the efficiency of separation of oil emulsion intermediate layers of oil and water, dehydration, desalting of crude oil and Department of mechanical impurities.

The task is solved in that in the method of processing oil emulsion intermediate layers, including the supply of oil emulsion in the tank, the oil is separated and the direction to the inlet of oil, according to the invention the supply of oil emulsion in the tank performed with a flow rate of 0.5-1 m3/h through the layer of the waste water of the same oil reservoir with a salinity of less than the saturation temperature of 20-30°and a layer thickness of wastewater 6-8 PM

The invention

The increase of water production wells, Shiro is the first application of the methods of enhanced oil recovery and enhanced oil recovery, the joint collection of emulsions Carboniferous and Devonian horizons, uncontrolled dosing of chemicals in the system of collection and preparation of production wells leads to the accumulation apparatuses oil treatment oil emulsion intermediate layers, i.e. layers between separated from conventional oil emulsion of oil and separated water. Such oil emulsions are highly stable water-oil emulsions with a high content of mechanical impurities. As a rule, the destruction of such oil emulsions cannot traditionally applied methods and demulsifiers. The accumulation of oil emulsion intermediate layers dumped into a separate tank, which is its treatment or disposal.

In the proposed invention solves the problem of separation of oil emulsion intermediate layers of oil and water, dehydration, desalting and separation of solids.

To solve the problem of oil emulsion intermediate layers is transported by pipeline to a storage tank oil emulsion intermediate layers located on the installation of oil. Accumulated emulsion through the pipeline is directed to the lower part of the tank filled with the waste water of the same oil reservoir with a salinity of less than the limit of saturation when the temperature 20-30° With a layer thickness of wastewater 6-8 meters the Flow of oil emulsion in the lower part of the tank is performed with a flow rate of 0.5-1 m3/h Oil emulsion passes through the layer of waste water and rises upwards. When this occurs, the oil is separated upward and its direction at the inlet of the oil. In the result it is possible to allocate up to 98% of the oil from the oil emulsion intermediate layers.

Specific example

By December 2003 in tanks and settling devices Kuteminskii of preparation of high-sulfur oil quantity oil emulsion intermediate layers amounted to more than 4.5 tons, which significantly worsened, the technological process at the facility, repeatedly a failure of the plan of handing over of the finished oil. Oil emulsion intermediate layers have not succumbed to the processing of conventional methods of oil.

Since January 2004 oil emulsion intermediate layers with a water content of 40% is served in the lower part of the reservoir, with a capacity of 2000 m3located on the installation of oil. The waste tank is filled with water the same oil reservoir with a salinity of 100 g/l, i.e. less than the saturation limit, with a temperature of 25°and the thickness of the layer of waste water 7 meters the Flow of oil emulsion in the lower part of the tank is performed with a flow rate of 0.7 m3/h Oil emulsion passes through the layer is full of water and rises upwards. When this oil is allocated to the top, there is a desalting, dehydration and precipitation of solids. Oil from the upper layer is directed to the inlet of the oil. The result is 98% of the oil released from the oil emulsion intermediate layers in the upper oil layer. After 3 months of implementation of this technology, the amount of oil emulsion intermediate layer was minimized. After the successful implementation of the proposed method of processing oil emulsion intermediate layers provided without technological breakdowns and stable delivery plan of the finished oil. There was no need of an overdose of demulsifier, the demulsifier consumption decreased by 20%. The annual economic effect from economies of chemicals amounted to about 4 million rubles

The application of the proposed method will allow you to split oil emulsion intermediate layers of oil and water, to carry out the dehydration and desalting of crude oil and separate the solids. The elimination of oil emulsion intermediate layers will allow the work units without technological breakdowns.

The method of processing oil emulsion intermediate layers, including the supply of oil emulsion in the tank, the oil is separated and the direction to the inlet of the oil, characterized in that the supply of oil emulsion in rez is rvoir performed with a flow rate of 0.5-1 m 3/h through the layer of the waste water of the same oil reservoir with a salinity of less than the saturation temperature of 20-30°and a layer thickness of wastewater 6-8 PM



 

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EFFECT: higher efficiency.

1 ex

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EFFECT: higher precision.

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EFFECT: higher efficiency.

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