SU916531A1 - Method for controlling desalting of petroleum emulsion - Google Patents

Description

The invention relates to the management of the process of desalting petroleum emulsions in the complex preparation of oil and can be used in the oil and petrochemical industry.

A known method of controlling the process of desalting oil emulsion, consisting in changing the flow rate of wash water depending on the salt content in the oil emulsion ¹ and wash water, changing the water content in crude oil and the residual water content at the output of the desalting process for a given salt content in the finished oil (one].

There is also known a method of regulating the process of desalting a petroleum emulsion by regulating the salt content in a petroleum emulsion at the outlet of the settler depending on the magnitude of the degree of contact between emulsified salt water and washing water.

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water at the inlet of the sump of the desalination process [2].

The closest to the present invention is a method for controlling the process of desalting an oil emulsion by controlling the degree of contact of emulsified produced water with flushing fresh water depending on the change in the rate of supply of the oil emulsion at the inlet of the sump and the salt content of the oil emulsion at the sump of the sump to the flush water flow at the sump inlet and controlling the level of separation of the oil emulsion and the water in the sump by influencing the flow rate of the settled water from the sump (3]

A common disadvantage of the known methods is that they do not take into account the dependence of the salt concentration in the oil emulsion at the outlet of the sump on the level of the phase separation of the oil emulsion and the water in the sump when changing the degree of contact emulsion 3 · 91653

girovanny salty water from washing

fresh water inlet sump.

The purpose of the method is to improve the quality of the oil emulsion at the outlet of the sump. _five

This goal is achieved by correcting the level of separation of the phases of oil emulsion and water in the sump depending on the change in the degree of contact of emulsified plastic water with washing fresh water at the inlet of the sump, the level of separation of the phases of the oil emulsion and water in the sump is proportionally reduced and vice versa.

The drawing shows a diagram of the method.

The pipeline 1 into the sump 2 is supplied with oil emulsion and after sludge it is discharged from the sump through the pipeline 3, and the remaining water. yes - via pipeline 4. To displace and flush the oil emulsion, pipeline 5 is supplied with washing water. The speed and flow of oil emulsion and fresh water are changed by sensors 6 and 7. The output of sensor 6 is connected to computing unit 8, which calculates the amount of contact of emulsified formation water with flushing water at the sump inlet according to the experimentally found formula

{L = 0.72065 + O, 218936 \ /, where V is the oil feed rate

emulsion.

The output signal of the computing unit as a "job" enters the regulator 9 of the degree of contact of emulsified produced water with flush water, with an impact on the actuator 10 installed on the flushing water pipeline. The regulator 9 also receives a signal from the sensor 7 of the feed rate of fresh water. The degree of contact of emulsified produced water with flushing water is corrected by a signal proportional to the amount of salt in the oil emulsion at the outlet of the settling tank, coming from the sensor 11, the input of which is connected to the sensing element 12.

The level of separation of the phases of the oil emulsion and water is measured by the sensor 13 and is regulated by the regulator 14 with an impact on the actuator 15,

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14

installed on the pipeline discharged water. The magnitude of the phase separation of the oil emulsion and water in the sump. corrected by the signal regulator 14, proportional to the degree of contact of the emulsified produced water with the flushing water coming from the output of the computing unit.

The degree of contact of emulsified produced water with flush water is regulated by a regulator 9 with an impact on the flow rate of flush water and a correction in terms of the salt content in the oil emulsion at the outlet of the sump. The level of separation of the phases of the oil emulsion and water in the sump is regulated by the regulator 14 with a correction according to the degree of degree kon-. clocking of emulsified and produced water with flushing water, which is continuously calculated by the computing unit 8. With an increase in the degree of contact, the controller 14 reduces the level of separation of the oil emulsion and water, and vice versa.

This leads to a change in the sludge time of the oil emulsion in the sump, which is closely related to the accuracy of controlling the salt content in the oil emulsion at the sump outlet.

According to preliminary calculations, the standard deviation of the salt content in the oil emulsion at the outlet of the settling tank according to the proposed method will decrease by 20% relative to the prototype.

Claims (1)

Claim The method of controlling the process of desalting oil emulsion by controlling the degree of contact of emulsified produced water with flushing water depending on the change in the rate of the oil emulsion at the inlet of the sedimentation tank and the salt content in the oil emulsion at the outlet of the settling tank phases of the oil emulsion and water in the sump by affecting the flow rate of distilled water from the sump, characterized in that, in order to improve the quality of the oil th emulsion at the outlet of the sump, the level of separation of the phases of the oil emulsion and the water in the sump is adjusted by changing the degree 5,916,531 contacting emulsified produced water with flush water.