RU194085U1 - Device for measuring the amount of oil, water and gas in the production of low-yield wells - Google Patents

Abstract

The utility model relates to the field of measurement technology, is designed to measure the parameters of liquid media directly in the pipeline and can be used in the oil and gas industry. The device improves the accuracy of measuring the density of liquids in produced products from oil-producing low-production wells by using the method of comparing static parameters of a “reference” fluid with changing parameters of the working environment. The device contains a measuring tank with nozzles for supplying and discharging SLE products dampers, a temperature sensor in the measuring tank, two liquid level sensors, a pressure sensor in the upper measured calibrated part of the tank cavity and a sensor for measuring pressure at its lower level, a control unit for switching the rotary valve, the inputs of which are connected to the associated gas discharge pipes and liquid drain, respectively, as well as a controller, while in the measured calibrated part of the tank an additional pressure tester is installed, connected by a pulse tube to the "negative" sensor chamber the pressure at the lower level, the “positive” chamber of which is connected by the impulse tube to the indicated additional pressure selector, while the “reference” liquid is poured into the impulse tubes coming from the tank with the “reference” liquid, in addition, two liquid level sensors with said control unit, and at the outlet of the nozzle for draining the liquid, a pump is connected to the control unit. 1 ill.

Description

The proposed utility model relates to the field of measurement technology, is designed to measure the parameters of liquid media directly in the pipeline and can find application in the oil and gas industry.

A known installation for measuring the amount of oil in low-yield wells, containing two vertical measuring cylinders with floats freely moving in them, a mechanism for switching the direction of flow from one measuring cylinder to another and a counter for the number of strokes of the floats, characterized in that, in order to increase the reliability of measuring small quantities of oil with simultaneous partial separation of associated gas, the vertical measuring cylinders are sealed and interconnected in the upper part of the pipeline m, the switching mechanism of the flow direction is made in the form of a rotary valve located between the inlet and outlet pipelines and connected to the piston drive of its switching, while the upper cavity of the cylinder of the piston drive is connected to the input pipe of the first measuring cylinder, the lower cavity of the cylinder of the piston drive is connected to the input pipe of the second measuring cylinder, and in the extreme positions of the rotary damper in the region of its ends, magnetic clamps are placed (Author. Witness No. 1492883, prior. 03/09/1987, publ. November 27, 1999).

A disadvantage of the known device is its complexity due to the presence of two measuring cylinders, performing the role of partial separation of associated gas, each of which introduces an error in the measurement results due to the lack of calibrated measuring volumes.

A device for measuring the flow rate of oil wells, containing a vertical cylindrical separator with a hydrocyclone and a damper, pressure sensors, temperature, lower and upper levels, gas, inlet and outlet liquid lines and a microprocessor, characterized in that the device is equipped with a switch for connecting to the collector in turn exhaust gas and liquid lines, a check valve is installed after the switch, and a pump is installed on the liquid line (Pat. RF No. 9478, prior. March 17, 1997, publ. March 16, 1999) .

A device is known for measuring the flow rate of oil wells, comprising a vertical measuring tank with a side pipe for supplying well products to it, with an upper pipe for discharging associated gas and a lower pipe for draining the liquid, a temperature sensor in the measuring tank-separator, two level signaling sensors liquids for limiting from below and above, respectively, the measured calibrated part in units of the volume of the tank by its height, one is the same, but intermediate, the sensor signal placed between them an isator, two pressure sensors for measuring pressure in the upper cavity of the measuring tank and for measuring pressure at the lower level of its measured calibrated part, as well as a controller with a multichannel, by the number of sensors, input for introducing electric information signals of these sensors into it and a control output, pipeline product supply, associated gas discharge pipeline and liquid phase discharge pipeline, respectively controlled by a three-way valve controlled by the controller, the inputs of which are connected to the pipelines associated gas and fluid draining, respectively, and its outlet through a non-return valve is connected to the flow line from the well, characterized in that in the pipelines for associated gas discharge and draining of the liquid phase, respectively, transducers of gas and liquid phase flow meters, the information outputs of which are connected to multi-channel input of the controller. In addition, a moisture meter is additionally installed in the liquid drain line, the information output of which is also connected to the multichannel input of the controller (Pat. RF No. 2382195, prior. June 17, 2008, published on February 20, 2010).

Known devices are designed to measure the flow rate of production of high-performance wells producing soda oil, and are not intended to measure the component content of produced fluid from low-production wells, in addition, the disadvantage of the known devices is the lack of automatic correction of the density of the “reference” liquid in temperature and pressure in relation to operating conditions medium being measured, which affects the accuracy of measuring fluid density.

The technical problem solved by the utility model is to increase the accuracy of measuring the density of liquids in produced products from oil-producing low-production wells by using the method of comparing static parameters of a “reference” fluid with changing parameters of the working medium, which ultimately improves the accuracy of measuring the amount of oil, water content and gas in the production of marginal wells.

In the inventive device for measuring the amount of oil, water and gas in products of marginally well, containing a vertical measuring tank with a side pipe for supplying well products to it, with an upper pipe for the discharge of associated gas and a lower pipe for draining the liquid, the temperature sensor in the measured reservoir, two liquid level sensors to limit the bottom and top, respectively, of the measured calibrated part in units of the volume of the tank by its height, a pressure sensor for measuring pressure in the upper measured calibrated part of the reservoir cavity and a sensor for measuring pressure at the lower level of its measured calibrated part, a control unit for switching the rotary valve, the inlets of which are connected to the associated gas discharge and fluid drain pipes, respectively, as well as a multi-channel controller, by quantity sensors, an input for introducing into it the electrical information signals of these sensors, in contrast to the known, in the measured calibrated part of the tank at a height h from the location level an additional pressure sampler is installed at the bottom pressure collector, connected by a pulse tube to a “positive” sensor chamber for measuring pressure at a lower level, the “minus” chamber of which is connected by a pulse tube to the specified lower pressure sampler, while a “reference” liquid is poured into the pulse tubes from a container with a “reference” liquid, in addition, two liquid level sensors for signaling the lower and upper measured calibrated parts are connected to the said control unit, and on During the overflow pipe mounted pump connected to the control unit.

The attached figure shows the inventive device.

The inventive device comprises a vertical measuring tank 1 with a diameter D with a side pipe 2 for supplying well products to it, an upper pipe 3 for discharging associated gas and a lower pipe 4 for draining the liquid, an electric temperature sensor 5 in the measuring tank 1, the upper sensor-detector 6 and a lower sensor-signaling device 7 of the liquid level to limit the top and bottom, respectively, of the measured calibrated part in units of volume V _{0 of the} tank by its height N, an electric pressure sensor 8 for measuring pressure in the upper part of the volume V _{0 of the} measured calibrated part of the tank 1 and a sensor 9 for measuring the pressure difference at the lower level of its measured calibrated part. A rotary valve 10 connected to the control unit 11 is installed on the lower pipe 4 for draining the liquid. The operation of the device is controlled by a controller 12 with a multichannel, according to the number of sensors, input for introducing electric information signals of sensors 5, 8, 9. into it. an additional pressure sampler 13 is installed at the tank at a height h from the location of the lower pressure sampler 14 with a valve 15 connected by an impulse tube 16 to a "negative" sensor chamber for measuring pressure n and the lower level 9, the “positive” chamber of which is connected by the impulse tube 17 to the valve 18 of the additional pressure tapper 13, while the “reference” liquid coming from the tank 19 with the “reference” liquid with the valve 20 is filled into the impulse tubes 16 and 17 in addition, two liquid level sensors 6 and 7 for restricting the volume V _{0 of the} measured calibrated part from below and above are connected to the control unit 11, and a pump 21, controlled by the control unit 11, is installed at the outlet of the liquid drain pipe. 22 - valve on the line between the "plus" and "minus" cameras of the lower pressure sensor 9, pos. 23 - valve at the inlet of the pressure sensor 8. Q - direction of motion of the production of the well.

The device operates as follows.

Before starting the measurement, the rotary valve 10 is closed and the measured product Q from the well enters through the lateral branch pipe 2 into the measuring tank 1 and fills it, while the filling of the measured calibrated volume V ₀ is controlled by first triggering the lower sensor-signaling device 7 of the liquid level, while the control unit 11 starts the timer and starts the countdown of the measurement time t, and when the liquid reaches the upper sensor-detector 6, the control unit 11 fixes the value of the filling time of the volume V ₀ .

According to the program laid in the controller 12 is calculated productivity-Q _Well wells:

according to the formula:

Where:

V ₀ - the volume of the measuring part of the column, m ³ ,

t is the filling time of the volume V ₀ , min.

In the calibrated volume V ₀ the temperature T is measured by an electric temperature sensor 5 according to the formula:

Where:

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

T _in - the upper limit of temperature measurement, degrees C,

T _n - the lower limit of temperature measurement, degrees C,

J _ISM - current measured, mA,

J _min - minimum current, mA,

J _max - maximum current, mA,

T _in , T _n , J _min , J _max - the values are taken from the passport data to the temperature sensor, J _meas - the measured current supplied to the temperature sensor 5 and recorded by the control unit 11.

Measurement of pressure in volume V ₀ :

Where:

P _a - absolute pressure, MPa,

- максимальное значение тока, мА,

- maximum current value, mA,

- минимальное значение тока, мА,

- minimum current value, mA,

- ток измеряемый, мА,

- current measured, mA,

P _in - the upper limit of pressure measurement, MPa,

,

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

- измеряемый ток, подаваемый на датчик давления 8 и фиксируемый блоком управления 11.

,

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

- the measured current supplied to the pressure sensor 8 and recorded by the control unit 11.

Measurement of fluid density - p _rail in the volume V _0:

Where:

- плотность эталонной жидкости, приведенной к рабочим условиям по температуре и давлению, расчитанная по формуле:

- the density of the reference fluid reduced to the operating conditions for temperature and pressure, calculated by the formula:

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 9, MPa,

- плотность эталонной жидкости в рабочих условиях, кг/м³,

- the density of the reference fluid under operating conditions, kg / m ³ ,

ρ _20р is the density of the reference liquid under standard conditions, kg / m ³ , measured by an ariometer under standard conditions: temperature -20 deg. C, pressure - 1.03 MPa,

- коэффициент объемного расширения эталонной жидкости, 1/град С, выбирается из справочника по жидкостям,

- the coefficient of volume expansion of the reference liquid, 1 / city C, is selected from the directory of liquids,

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

T is the temperature of the measured fluid, degrees C, determined by the formula 2.

P _a - the absolute pressure of the measured fluid, MPa, determined by the pressure sensor 8.

Determination of the content of the proportion of water - W _i in the volume V ₀ :

Where:

p _{in the} density of produced water, kg / m ³ ,

p _n - the density of degassed oil, kg / m ³ ,

p values _in p and _n are taken from geological data service,

p _w - measured liquid density, kg / m ^3, determined according to the formula 4.

Determination of the mass of liquid - M _zhi in volume V _0:

_ρi - the measured density of the liquid, kg / m ³ determined by formula 4 at time t _i .

Determination of the amount of water and oil in volume

Determination of the total amount of oil mass - M _n. for a given time τ:

тонна/час (тонна/сутки),

ton / hour (ton / day),

Determination of the total amount of water mass M _in a given time τ:

тонна/час (тонна/сутки),

ton / hour (ton / day),

Determination of the current water content - W in well production:

Determining the amount of gas Q _g in well production:

Where:

ϕ ₀ - volumetric gas content in 1 m ³ oil, the value is taken from the data of the geological service.

Determination of gas factor G _f wells:

After the measurement process is completed, the rotary valve 10, upon a command from the control unit 11, switches to the “liquid discharge” position, and the liquid begins to be pumped out of the measured part of the calibrated reservoir using the pump 21 into the flow line of the well.

The gas and liquid flow measurement processes are embedded in the algorithms of the mathematical calculation program installed in the controller 12, which are necessary to obtain the final results.

Claims (1)

A device for measuring the amount of oil, water and gas content in products of low-flowing wells, containing a vertical metering tank with a side pipe for supplying well products to it, with an upper pipe for the discharge of associated gas and a lower pipe for draining the liquid, a temperature sensor in the measuring tank, two liquid level sensors to limit the lower and upper measured calibrated parts in units of the tank volume by its height, a pressure sensor for measuring pressure in the upper of the calibrated part of the reservoir cavity and a sensor for measuring pressure at the lower level of its measured calibrated part, a control unit for switching the rotary valve, the inputs of which are connected to the associated gas discharge and fluid drain pipes, respectively, as well as a controller with a multichannel, by the number of sensors, input for introducing into it the electrical information signals of these sensors, characterized in that in the measured calibrated part of the tank at a height h from the location of the lower pressure selector an additional pressure sampler is connected, connected by a pulse tube to a “positive” camera of the sensor for measuring pressure at a lower level, the “minus” chamber of which is connected by a pulse tube to the specified lower pressure sampler, while a “reference” liquid is introduced into the pulse tubes from "Reference" liquid, in addition, two sensors, signaling liquid level to limit the bottom and top of the measured calibrated part connected to the control unit, and at the outlet of the nozzle for draining liquid whith a pump connected to the control unit.

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