RU1799278C - Gas-water-oil mix fractioning method - Google Patents

Abstract

Using; oil industry, oil field preparation. Purpose: increasing the efficiency of the separation process. SUMMARY OF THE INVENTION A demulsifier is introduced into the crude oil of a field, the resulting gas-oil-oil mixture is sprayed in a hydrocarbon gas medium, sparged with gas supplied from the bottom of the apparatus and sent to sedimentation. Gas for bubbling is supplied from the first or preliminary separation stage. After bubbling, the mixture with the gas stream enters the final separation into gas, oil and water. 1 s.p. crystals, 1 ill., 1 tab.

Description

FIELD OF THE INVENTION This invention relates to the oil industry, in particular to methods for oil field treatment.

The aim of the invention is to increase the efficiency of the separation process.

The method is as follows ..

The gas-oil-water mixture with the demulsifier 1 introduced into it is fed through line 2 to the upper part of the mass transfer tank 3 and is sprayed in the gas medium of the spray zone 5 through a spraying device 4. Then, after spraying, the liquid is collected in the lower part of the mass transfer tank Z. and the final separation into gas, oil and water in the zone. 6. Dehydrated oil flows into the buffer section of the apparatus 7, from where it is pumped into the main oil pipeline through line 8.

Water is pumped out from the bottom of the final separation zone along line .9, and gas is taken from the top of the apparatus via line 10.

Gas is introduced into the lower part of the mass transfer tank via line 11, for example, from the first or preliminary separation stage through a bubbling device 12. Gas bubbles pass through the liquid accumulating in the lower part of the tank, form a gas flow and, entering the spray zone through line 13 with adjustable valve 14, they enter the gas space of the zone of the final separation of the mixture into gas, oil and water.

The gas flow in line 11 is maintained constant within 1-3 nm of gas per meter of incoming fluid.

PRI me R 1 (prototype). A demulsifier at the rate of 20 g / t of oil is introduced into the crude oil of the Vyngapurovskoye field with a water content of 20% and water-oil is sprayed onto the mixture in a hydrocarbon gas environment (methane). The mixture is then collected and settled for 1 hour at a temperature of 23 ° C, after which its pressure is determined

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saturated vapors and residual water content. :

PRI me R: 2 (the proposed method). A demulsifier is introduced into the crude oil of the Vyngapurovskoye field with a water content of 20% at the rate of 20 g / t of oil and water-oil is sprayed onto the mixture in a hydrocarbon gas medium (methane). At the same time, the mixture to be collected is sparged with gas (methane) and then left to stand for 1 hour at 23 ° C, after which its saturated vapor pressure and residual water content are determined.

The results of the experiments on the prototype and the proposed method are shown in the table.

Analysis of the table shows that when using the proposed method, in comparison with the prototype, the pressure of saturated oil vapor is reduced, the aggregate stability of the emulsion is reduced, and

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residual water and oil content are reduced.

Thus, the proposed method allows to reduce the loss of oil from evaporation and to improve the quality of its preparation.

Claims (2)

1. A method for separating a gas-oil-oil mixture, comprising spraying the mixture in a gaseous medium, withdrawing a gas; flow and settling of the mixture treated with the demulsifier, characterized in that, in order to increase the efficiency of the separation process, gas is bubbled into the mixture layer before settling. 2. The method according to claim 1, with the exception that in order to reduce the cost of cleaning the gas from drip oil, the gas stream 20 is fed into the settling zone. /5 ..