RU176182U1 - Full-flow liquid density meter - Google Patents

Abstract

A utility model relates to the field of measuring parameters of liquid media, for example, an oily liquid directly in the stream or gas-liquid mixture. The device contains a loop-shaped pipe of equal cross section (measuring column), consisting of ascending, horizontal and descending branches, lower pressure taps installed at the same level as the hinge-shaped tube, an additional pressure tester, a pressure difference sensor, an absolute pressure sensor, a temperature sensor of the measured liquid, impulse tubes with a separation fluid and a recording unit, while the additional pressure tester is installed at a height h from the level of the lower pressure taps, in At the bottom of the measuring column, a reservoir with a separation liquid is installed, which maintains the level of separation liquid in the impulse tubes, in contrast to the known one, the specified additional pressure tester has inputs inside the ascending and descending loops and is connected by the impulse tube to the “positive chamber” of the pressure difference sensor, “minus” the chamber of which is connected by impulse tubes to the lower pressure sensors on the ascending and descending loops, in addition, a tube of length h is placed inside the ascending loop, communicates with the external atmosphere. A pressure difference sensor, an absolute pressure sensor, a temperature sensor of the measured liquid are connected to the recording unit. EFFECT: increased accuracy of measurement of parameters and simplified design. 1 s.p. f-ly, 1 ill.

Description

The proposed utility model relates to the field of measuring parameters of liquid media, for example, an oil-containing liquid directly in a stream or a gas-liquid mixture, and can find application in oil and gas production, oil refining, petrochemical and other industries.

Known densitometer for liquid media containing a loop-shaped pipe, consisting of ascending, horizontal and descending branches, three pressure transducers mounted respectively on the ascending, horizontal and descending branches of the pipe, two differential pressure gauges and a recording device (Auth. Certificate. USSR No. 13225328, publ. Bul. No. 27, 07/23/1987).

The disadvantage of the densitometer is the lack of automatic correction of the density of the “reference” liquid by temperature and pressure as applied to the operating conditions of the medium being measured, which affects the accuracy of measuring the density of the liquid.

Known densitometer of liquid or gaseous media, which is based on the method of comparing the density of the "reference" fluid with the density of the working medium, which increases the accuracy of the order (Pat. RF No. 67263, G01N 9/26, prior. 05.24.2007, publ. 10.10.2007).

The known densitometer contains a loop-shaped pipe consisting of ascending, horizontal and descending branches, three pressure collectors installed respectively on the ascending, horizontal and descending branches of the loop-shaped pipe, two pressure difference sensors, absolute pressure sensor, temperature sensor, impulse tubes with a “reference »A liquid that perceives the pressure of the working medium directly by the contact method, and a recording unit. The densitometer is equipped with an additional temperature sensor for the “reference” liquid, which is poured into the impulse tubes and an additional pressure selector located on the housing for the thermometer. As the "reference" fluid used fluid in contact with the working medium, but not miscible with it. In addition, the pressure sampling devices installed on the ascending, descending branches of the loop-shaped pipe and the pressure sampling device located on the housing for the thermometer are at the same level in the lower part of the loop, and the density of the liquid or gaseous media is determined by the attached formulas.

In addition, an absolute pressure sensor, two pressure difference sensors, sensors for the temperature of the working medium and the temperature of the "reference" liquid are connected with the recording unit.

A disadvantage of the known densitometer-flowmeter is as follows.

The design of the device contains two pressure difference sensors, on the basis of the readings of which the measurement of the parameters of the medium being measured is provided. Moreover, to calculate the speed, mass and viscosity, different formulas are used depending on the nature of the flow: laminar or turbulent. In turbulent flow, the flow rate can only be measured in the indicator mode, which affects the accuracy. Laminar flow is characteristic of viscous media, which limits the scope of the device for measuring the parameters of media with a different flow.

A device for measuring the parameters of low-viscous and viscous fluids in a pipeline, comprising a loop-shaped pipe of equal cross-section, consisting of ascending, horizontal and descending branches, lower pressure taps installed at the same level, respectively, on the ascending and descending branches of the loop-shaped pipe, an additional pressure tester installed on the descending branch, the first and second pressure difference sensors, absolute pressure sensor, temperature of the "reference" liquid, impulse tubes with "et a pubic ”(separation) fluid, which receives the pressure of the fluid directly by the contact method, and a recording unit, while the first pressure difference sensor is connected by impulse tubes with a“ reference ”fluid to the additional pressure tester on the descending branch and to the pressure tester on the ascending branch, and the second the pressure difference sensor is connected to pressure taps on the descending branch, while an additional pressure tester on the descending branch is installed in its upper part at a height h from the level of of the lower pressure sampling devices, impulse tubes with a “reference” fluid are placed outside the loop-shaped tube, in addition, the recording unit is equipped with a program for measuring and calculating density, flow rate, mass and volume flow rates, viscosity, flow rate and component volume for miscible two-component low-viscosity and viscous fluids. In the upper part of the measuring branches, a container with a “reference” liquid is installed that maintains the level of a “reference” liquid in impulse tubes, on which a temperature sensor for a “reference” liquid is installed (Pat. RF No. 164946, prior. 06/09/2016).

A disadvantage of the known device lies in the complexity of the design, in which to expand the functionality of the device due to the ability to accurately measure the parameters of fluids with different viscosities and compositions with a low flow rate, an additional pressure difference sensor is installed, while there is no accounting for friction loss compensation ascending and descending loops, which leads to measurement errors.

The objective of the claimed utility model is to simplify the design and improve the accuracy of the measurement results.

The problem is solved in that in a full-flow densitometer of liquid media containing a loop-shaped pipe of equal cross-section (measuring column), consisting of ascending, horizontal and descending branches, the lower pressure taps installed at the same level, respectively, on the ascending and descending branches of the loop-shaped pipe, additional pressure sampler, differential pressure sensor, absolute pressure sensor, measured liquid temperature sensor, impulse tubes with pressure separating liquid e of the measured liquid directly by the contact method, and a recording unit, while the additional pressure tester is installed at a height h from the location of the lower pressure taps, a tank with a separation liquid is installed in the upper part of the measuring column, which maintains the level of the separation liquid in the impulse tubes,

unlike the known one, the indicated additional pressure tester has inputs inside the ascending and descending loops and is connected by the impulse tube to the “positive chamber” of the pressure difference sensor, the “negative” chamber of which is connected by impulse tubes to the lower pressure sensors on the ascending and descending loops, in addition , inside the ascending loop there is a tube of length h in communication with the external atmosphere.

The measuring column is connected by means of taps with tees connected to each other by a tap and to the ends of the pipeline with the measured fluid.

A pressure difference sensor, an absolute pressure sensor, a temperature sensor of the measured liquid are connected to a recording unit, which, according to the program laid down in it, calculates the consumption density of the oil-containing liquid and the flow rate of water in the gas-liquid mixture.

The figure shows the inventive device.

A full-flow densitometer of liquid media (measured liquid Q) for measuring its parameters contains a measuring column in the form of a loop-shaped pipe consisting of ascending 1, horizontal 2 and descending 3 branches, impulse tubes 4 filled with a separation liquid that is directly in contact with the measured liquid but not miscible with it, for example, organosilicon, having known coefficients of volume expansion and compression, two pressure taps located at the same level 5 and 6 in the lower part of the loop, an additional pressure sampler 7 (pressure sampler) located at the top of the loop-shaped pipe at a distance h from the location of the lower pressure samples 5 and 6. In this case, the pressure sampler 5 is installed on the ascending branch 1, the pressure sampler 6 is installed on the descending branch 3, and the pressure sampler 7 has entering 8 into the upward loop and entering 9 into the downward loop 3.

The pressure difference sensor 10 is connected to the ascending branch 1 and the descending branch 3 as follows: the “minus” chamber of the pressure difference sensor 10 is connected to the pressure sampler 5 on the ascending branch 1 by means of a pulse tube 11 with a separation liquid and a valve 12, and connected via a pulse tube 13 with a separation fluid and a valve 14 with a pressure sampler 6 on the descending branch 3. A “positive” chamber of the indicated sensor is connected to a pressure sampler 7 by a pulse tube 15 with a separation fluid and a valve 16, located at the top of the loop-like pipe at a distance h from the location of the lower pressure taps 5 and 6. In the place of contact of the separation fluid and the measured fluid in the pressure testers, mini-chambers for transmitting pressure are made.

The device is equipped with an absolute pressure sensor 17 mounted on the descending loop 3, and in the upper part of the measuring branches there is a container 18 with a separation fluid that maintains the level of separation fluid in the impulse tubes with valves 20 and 21.

A temperature sensor 22 of the measured liquid is installed on the descending branch 3.

The input 8 into the upward loop 1 and the input 9 into the downward loop 3 is connected to the pressure selector 7 by means of tubes with valves 23 and 24, respectively.

Inside the ascending loop 1, a tube 25 of length h is placed, in communication with the external atmosphere, which is designed to compensate for friction losses in the ascending and descending loops at level h.

The measuring column is connected by means of taps 26 and 27 to tees 28 and 29, interconnected by a valve 30 and to the ends of the pipeline with fluid Q. The valve 31 is used to vent air during hydraulic testing of the measuring column.

The pressure difference sensor 10, the absolute pressure sensor 17, the temperature sensor 22 are connected to the recording unit 32 (BOI - information processing unit), which, according to the program laid down in it, calculates the consumption density of the oil-containing liquid, and the consumption content of water in the gas-liquid mixture.

Full-flow densitometer for measuring the parameters of liquid media works as follows.

In the operating position, the valves: 12, 13, 23 and 24 are open, and the valves: 20,21 and 31 are closed. Cranes: 26 and 27 are open, and crane 30 is closed.

The measured liquid "Q" enters the input of the ascending branch 1, where the pressure sampler 5 transfers pressure to the pressure difference sensor 10 to its "minus chamber", then the measured liquid rises along the ascending branch 1 to level h, where pressure is taken from input 8 through input 8 the upper part of the ascending branch 1 and through the valve 23 is transferred to the pressure sampler 7. Next, the measured liquid is lowered along the descending branch 3, from the inside of which at level h through the input 9 with valve 24 the pressure is taken to the pressure sampler 7, which AET pressure compensated height h in the "plus" differential pressure sensing chamber 10. At the descending branch 3 is measured by the absolute pressure P _a and transmitted to the BOI 32. Next, the measured liquid is lowered, wherein the pressure valve 6 through the sampler 16 also transmits the pressure in the plus " the chamber of the sensor of the pressure difference 10, the testimony of the pressure difference ΔP, which is supplied to BOI 32.

At the outlet in the descending branch 3, the temperature of the liquid is measured by a temperature sensor 22, the readings of which are sent to BOI 32.

The device is equipped with a capacity 18 with a separation liquid, which maintains the liquid level in the impulse tubes 4 in the event of evaporation or leakage, which increases the measurement accuracy due to the stability of this level, which affects the measurement results.

Improving the accuracy of measurements is also achieved by taking into account friction compensation when measuring the pressure taken through the inlet 8 inside the ascending loop 1 and through the inlet 9 inside the descending loop 3 connected to the pressure selector 7 by means of tubes with valves 23 and 24, respectively.

In addition, a tube 25 of length h is placed inside the ascending loop 1, communicating with the external atmosphere, which is designed to compensate for friction losses in the ascending and descending loops at level h.

The flow rate density of the measured fluid is calculated by the formula:

Where:

p _w - expenditure measured liquid density, kg / m ^3,

g - acceleration of gravity, m / s ² ,

h is the height of the liquid column, m,

ΔP is the pressure difference measured by the sensor 10, MPa,

± Δρ _zhs - correction for readings of the density of the measured liquid in statics, kg / m ³ , is set during the calibration of the density meter,

± _{Δр Ж∂} - correction for the density of the measured fluid in the dynamics, kg / m ³ , is set during the calibration of the density meter,

ρ _tp is the density of the separation fluid under operating conditions, kg / m ³ ,

ρ _20p is the density of the separation liquid under standard conditions, kg / m ³ , measured by an ariometer under standard conditions: temperature -20 deg. C, pressure - 1.03 MPa,

β _t is the coefficient of volume expansion of the separation fluid, 1 / city C, is selected from the directory of liquids,

To _p - the volumetric compression coefficient of the separation fluid, MPa ^-1 , is selected from the directory of liquids,

t is the temperature of the measured fluid, degrees C,

P _a is the absolute pressure of the measured fluid, MPa.

The temperature of the measured liquid is determined by the formula:

Where:

t is the temperature of the measured fluid, degrees C,

- верхний предел измерения t, град С,

- the upper limit of measurement t, city C,

t _n - the lower limit of measurement t, city C,

J _max - maximum current, mA,

J _ISM - current measured, mA,

J _min - minimum current, mA,

, t_н, J_min, J_max - значения берутся из паспортных данных на датчик температуры.

, t _n , J _min , J _max - the values are taken from the passport data to the temperature sensor.

The absolute pressure of the measured liquid is determined by the formula:

Where:

P _a - the absolute pressure of the measured fluid, MPa,

- верхний предел измерения тока, мА,

- upper limit of current measurement, mA,

J _n - the lower limit of current measurement, mA,

J _ISM - current measured, mA,

- верхний предел измерения давления, МПа,

- upper limit of pressure measurement, MPa,

R _n - the lower limit of pressure measurement, MPa,

, J_н,

, Р_н - значения берутся из паспортных данных на датчик давления.

, J _n

, P _n - the values are taken from the passport data to the pressure sensor.

The flow rate of water in an oily liquid after gas separation is determined by the formula:

Where:

W _i - the flow rate of water in an oily liquid, a fraction,

- плотность воды, кг/м³, значение берется из данных геологической службы,

- the density of water, kg / m ³ , the value is taken from the data of the geological service,

ρ _n - oil density, kg / m ³ , the value is taken from the data of the geological service,

ρ _cm is the density of the mixture, kg / m ³ , is measured.

The current water cut of an oil well is determined by the formula:

Where:

W is the current water cut of the oil well,%,

W _i - the flow rate of water in an oily liquid, fraction.

The residual volumetric gas content in the gas-liquid mixture is determined by the formula:

Where:

ϕ is the residual volumetric gas content in the gas-liquid mixture, m ³ / m ³ ,

ρ _cm - density of the mixture, kg / m ³ , measured,

ρ _n - oil density, kg / m ³ , the value is taken from the data of the geological service,

- плотность воды, кг/м³, значение берется из данных геологической службы.

- the density of water, kg / m ³ , the value is taken from the data of the geological service.

Accounting for the compensation of friction losses on the ascending and descending loops due to the use of an integrated tube at a height h reduces the measurement error and provides an increase in the accuracy of measuring the parameters of the measured fluid.

The simplification of the design is due to the presence of one pressure difference sensor and the use of tees for connecting the measuring column to the pipeline, equipped with taps to shut off the flow.

This design provides ease of operation, since it is not necessary to stop the flow when removing the densitometer for verification, while by shutting off the taps 26 and 27 and opening the tap 30, the flow Q is guided through the pipeline, bypassing the measuring column.

Information sources:

1. Density meter for liquid media. Auth. testimonial. USSR No. 1325328, publ. Bull. No. 27,23.07.1987

2. Density meter of liquid or gaseous media. Pat. RF №67263, G01N 9/26, prior. May 24, 2007, publ. 10/10/2007, bull. No. 28.

3. Device for measuring the parameters of low-viscosity and viscous fluids in the pipeline. Pat. RF №164946, prior. 06/09/2016, publ. 09/27/2016, Bull. Number 27.

4. Altshul A.D., Zhivotovsky L.S., Ivanov L.P. Hydraulics and aerodynamics. M., Stroyizdat, 1985

Claims (2)

1. Full-flow densitometer of liquid media containing a measuring column in the form of a loop-shaped pipe of equal cross-section, consisting of ascending, horizontal and descending branches, lower pressure taps installed at the same level, respectively, on the ascending and descending branches of the loop-shaped pipe, additional pressure tester, sensor pressure differences, absolute pressure sensor, temperature sensor of the measured liquid, impulse tubes with a dividing liquid, perceiving pressure of the measured liquid directly contact method, and a recording unit, while the additional pressure tester is installed at a height h from the location of the lower pressure taps, a container with a separation fluid is installed in the upper part of the measuring column, which maintains the level of the separation fluid in the impulse tubes, characterized in that the additional pressure tester has inputs inside the ascending and descending loops and is connected by an impulse tube to the “plus camera” of the pressure difference sensor, the “minus” camera of which is connected and pulse tubes with lower pressure take-off sensors on the ascending and descending loops, in addition, inside the ascending loop there is a tube of length h in communication with the external atmospheric environment, in addition, a pressure difference sensor, an absolute pressure sensor, a temperature sensor of the measured liquid are connected to the recording unit equipped with a program for calculating the flow rate of the oil-containing liquid and the flow rate of water in the gas-liquid mixture. 2. A full-flow densitometer of liquid media according to claim 1, characterized in that the measuring column is connected by means of taps with tees connected to each other by a tap and to the ends of the pipeline with the measured liquid.

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