RU171318U1 - DEVICE FOR DRAINING COMMODITY WATER FROM THE RESERVOIR - Google Patents

Abstract

A device for draining bottom water from an oil tank refers to equipment for tanks used in the extraction, transportation, refining and storage of oil and oil products. The proposed device includes a drainage pipe mounted in the side wall of the tank, an oil-water interface position sensor, an analyzer, flow regulator, control unit and fluid flow mixer. For cases when drainage is carried out by pumping instead of a static fluid flow mixer, before The input of the analyzer is a pumping unit.

Description

The utility model relates to equipment for equipping reservoirs used in the extraction, transportation, refining and storage of oil and oil products.

Commercial water is drained through a drainage pipe located in the lower part of the side wall of the vertical tank.

The decision on drainage from tanks is made:

- by a signal from the bottom water sensor in the tank - no more than 20% of tanks are equipped with such sensors;

- operators of the tank farm on the basis of their experience based on the requirements of the technological process regulations or periodically bypassing the tanks. At the same time, the valve opens on the drainage pipeline and, having discovered commercial water, drainage is carried out.

Drainage is usually carried out by gravity due to the pressure of a liquid column in the tank. In this case, the fluid moves through the drainage pipe in a laminar flow.

At the final stage of drainage, liquid enters the pipeline in the form of an emulsion from the oil-water boundary layer, which, when moving through the pipeline, is stratified into oil and water. When draining with visual control of the drained liquid, the stratification into oil and water does not make it possible to accurately determine the moment of completeness of the discharge of produced water.

Recently, reservoirs of commodity and raw material parks have been equipped with automatic drainage systems for produced water, which use quality control instruments for produced water, which measure the percentage of water in oil or petroleum products.

Moreover, the accuracy of determining the ratio depends on the quality of mixing the oil-water mixture.

Known oil concentration indicator in water SN-1T (manufactured by Spetspribor LLC, Kazan), designed to automatically control the concentration of oil in water flowing through a drainage pipeline, and control the actuator of the production process. In this device, the degree of concentration is estimated by the effect of oil fluorescence under ultraviolet radiation.

The known automatic discharge system for commercial water PAUTBAC II (manufactured by "SERES environnement", France), in which quality control of produced water is carried out by its dielectric conductivity.

Each of these devices does not have the ability to accurately determine the moment of completion of the drainage of produced water due to the fact that they are calibrated on a homogeneous liquid, and by the end of the drainage, liquid separated into oil and water flows through the drainage pipeline.

In addition, often the technological process requires stopping the drainage at a certain water-oil ratio, and delamination does not allow the devices to do this exactly.

The closest analogue of the claimed utility model is a device for removing produced water from the reservoir, containing an oil-water interfacial position sensor, a drainage pipeline, an analyzer for determining the quality of produced water, a pumping unit for pumping, a flow regulator for produced water and an automatic control unit (patent for useful Model RU 151321 U1, priority dated June 16, 2014, IPC - B65D 88/12).

The disadvantage of this device is the inability to accurately determine the moment of completion of the drainage of produced water due to the stratification of the transition layer emulsion into oil and water when it moves through the drainage pipeline.

The problem to which the claimed utility model is directed is to increase the accuracy of determining the moment of completion of drainage.

The technical result in the proposed utility model of a device for draining produced water from an oil tank containing a drain pipe fixed to the side wall of the tank, an oil-water interfacial position sensor, an analyzer, a flow regulator and a control unit is achieved by the fact that the drain pipe is equipped with a liquid flow mixer installed before entering the analyzer. For cases when drainage is carried out by pumping, instead of a fluid flow mixer, a pumping unit is installed in front of the analyzer inlet.

In FIG. 1 shows a diagram of a device for draining bottom water from an oil tank, comprising a tank 1 with oil or oil 2 and bottom water 3, a drain pipe 4, an oil-water interfacial position sensor 5, a fluid flow mixer 6, a fluid quality analyzer 7, an electric drive controller flow rate 8 and control unit 9.

A device for draining produced water from an oil tank works as follows.

At the command of the operator, from the monitoring system of the tank farm or automatically, the control unit 9 interrogates the position sensor of the oil-water interphase level 5 about the presence of produced water 3 in the tank 1.

If the sensor 5 indicates the presence of bottom water 3, at the command of the operator or control unit 9, an electric drive flow controller 8 is turned on, opening the drain through the drain pipe 4 of bottom water 3.

Commercial water 3, falling into the mixer of stream 6, is converted into a homogeneous liquid mixture, which enters the analyzer 7, where its quality is analyzed and the oil-water ratio is determined. Upon reaching the specified quality parameters of produced water, the analyzer generates a signal to the control unit 9, by which the electric drive flow controller 8 is turned off and drainage is stopped.

If the drainage is carried out by pumping, instead of the mixer fluid flow 6 in front of the input of the analyzer 7 is installed pumping unit.

Claims (2)

1. A device for draining produced water from an oil tank, comprising a drain pipe fixed to the side wall of the tank, an oil-water interfacial position sensor, an analyzer, an electric drive flow controller and a control unit, characterized in that the drain pipe is provided with a fluid flow mixer installed in front of the analyzer. 2. The device according to claim 1, characterized in that a pumping unit is installed in front of the analyzer as a fluid flow mixer.

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