SU1386636A1 - System for automatic measuring of water content in oil emulsion flow - Google Patents

Abstract

The invention relates to the automation of technological processes in the extraction, transport and preparation of oil in the oil production and petrochemical industries and improves the accuracy and reliability of measuring the water content in the flow of oil emulsion. The system for automatically measuring the water content in the oil emulsion flow contains piezometric sensors 1, 2, located at the same level in tanks 3 and 4, differential pressure gauges 5 and 6, and pressure setting device 7 for measuring the difference in hydrostatic pressures generated respectively between the oil emulsion g and oil and between formation water and oil, a unit 8 for calculating the water content of the oil emulsion stream and an instrument 9 for continuously displaying the results of the calculation. 1 il. & (L with

Description

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The invention relates to the automation of technological processes for the extraction, transportation and preparation of oil and can be used in the oil-producing and petrochemical industries.

The aim of the invention is to improve the accuracy and reliability of the measurement of water content in the oil: oil stream.

The drawing shows a block diagram of the Automatic System from the Water Content in the Oil Emulsion stream.

The circuit contains piezometric sensors 1 and 2, located on the same level in capacitors 3 and 4, Piezometric sensor I is connected to the positive chamber of the differential pressure gauge 5, the piezometric sensor is the 2nd positive pressure sensor of the differential pressure sensor 5. $ negative cameras of the differential pressure gauge 5 receive a signal from setting device 7. | 1; advances, and the outputs of the differential pressure gauges 5 and 6 are connected to the unit 8 for calculating the water content in the oil emulsion flow. The output of the unit 8 is connected to the output of the device 9 to continuously display the results of the calculation. The passage of the tank 3 through the disperser 10 is connected to the oil emulsion supply line 1 1, which through the overflow is continuously discharged through the pipeline 12. The piezometric sensor 1 receives the compressed air through the line 13, which is discharged through the line 14. The capacity 4 through the pipeline 15 continuously The reservoir enters the water and is discharged through the pipeline 16. Via line 17, the piezometric sensor 2 is compressed into the air ,.

C1 system works as follows.

:

Oil to the emulsion from the stream. Through the dispersant 10 continuously enters the lower part of the tank 3 and through the free drain from the upper part of the hole is discharged through the pipeline 12. When the water content in the stream I1 changes, the density of the emulsion in the tank 3 changes. The pipeline 15 continuously receives reservoir water of the same density as the water contained in the oil emulsion. The withdrawal of the formation water is carried out through a free discharge through the pipeline 16.

Compressed air through lines 13 and 17 is supplied to slit piezoelectric sensors and 2 located in containers 3 and 4. When these sensors exit, the compressed air encounters resistances created by layers of oil emulsion (in vessel 3) and salt formation. water (in the tank 4) ,. In this case, the pressure in lines 13 and 17 is proportional to the change in the piezometric pressures created by the oil emulsion and salt water. Moreover, the greater the density of water and oil emulsion, the greater the pressure in lines 17 and 13, hence the positive pressure in positive chambers of differential pressure gauges 6 and 5, and vice versa.

The fluid levels in both tanks are the same and equal to H, the signal (PH) from the output of the setter 7, proportional to the hydrostatic pressure created by the dehydrated oil with the level of H. The negative chambers of the differential pressure gauges 5 and 6 are output. A signal & R, . proportional to the pressure difference created by the oil emulsion (P) and oil (PH.), i.e.

R, Rne-Rn N (ph, -rk) 8. where p (n, respectively, density

oil emulsion and oil; g is the local acceleration of free fall.

At the output of the differential pressure gauge 6, a signal is generated that is proportional to the pressure difference created by the formation water (P) and oil,.

& Р, -Рв-Р „Н () §, where rc is the density of the melting point of the astatic water.

The signals from the outputs of the differential manometers 5 and 6 are fed to the inputs of the unit 8 for calculating the water content in the flow of the oil emulsion, which is calculated by the following relation: LR,

(L

RV-R,

RR, where oi is the relative water content

in oil N6 emulsion. The result of the calculation is continuously reflected in the instruments 9,

Claims (1)

Formula iso. A system for automatically measuring the water content in the oil emulsion flow, comprising the oil emulsion supply line, the capacitance and the measuring circuit, so that, in order to improve the accuracy and reliability of the measurement, it additionally contains a second capacitance connected by the input to the supply line produced water, two piezometric sensors and a dispersant, and the measuring circuit includes two differential pressure gauges, a pressure setting device and a unit for calculating the water content of a petroleum emulsion with a secondary device, the first piezo an insulating sensor is installed in the first container and Cpd It is connected to the positive chamber of the first differential pressure gauge, the second piezometric sensor is installed in the second tank and connected to the positive camera of the second differential pressure gauge, the input of the first tank is connected to the supply line of the oil egletry through the dispersant, the negative pressure gauge chambers, and the outputs of both differential pressure gauges are connected to the inputs of the unit for calculating the water content of the oil emulsion stream.