RU155020U1 - INSTALLATION FOR MEASURING THE DEBIT OF OIL WELL PRODUCTS - Google Patents

Abstract

1. Installation for measuring the production rate of oil wells, containing an inlet line, a horizontally oriented separation tank with an inlet device of a hydrocyclone type and a level gauge connected at the inlet to the wells, and at the outlet with gas and liquid measuring lines with flow meters placed in them, temperature measuring instruments and pressure and control devices, and the outlet to the collector, characterized in that the separation tank is made with a vertically oriented calibrated measuring tank equipped with a differential pressure sensor between the upper and lower part of the calibrated measuring vessel, a differential pressure sensor between the calibrated measuring vessel and the upper part of the separation vessel, as well as a differential pressure sensor between the separation vessel and the outlet to the manifold, while the control devices are made in the form of shut-off and control valves with the possibility of proportional-integral-differential regulation, and the regulating device on the gas line is functionally associated with dates the pressure difference between the separation tank and the outlet to the collector, and the regulating device on the liquid line is functionally connected to the level gauge of the separation tank. 2. Installation according to claim 1, characterized in that a sampling device is installed on the input line. Installation according to claim 1, characterized in that it is equipped with a volumetric liquid meter. Installation according to claim 1, characterized in that a three-way valve is installed on the inlet line connecting the inlet line with the outlet to the collector.

Description

The utility model relates to the oil and gas industry and can be used for operational accounting of oil well production rates in pressurized-gathering systems, including oil well production at fields at the stage of final production.

A known installation for measuring the production rate of oil wells, which contains an inlet pipe, a horizontally oriented separation tank with a vertically oriented calibrated measuring tank, equipped with a level gauge and differential pressure sensor, a flow switch connecting the gas and liquid lines and the collector, and a microcontroller [RU Patent No. 69147 to the utility model "Installation for measuring the production rate of oil wells", IPC E21V47 / 10. Published December 10, 2007 bull. No. 34]. A regulating device for maintaining a constant pressure differential between the separation vessel and the gas line and a differential pressure sensor are installed on the gas line, and a regulating device for maintaining a constant liquid level in the measuring vessel is installed on the liquid line.

The disadvantages of the known installation are the cyclical operation, which limits the application for wells with uneven daily flow rate; difficulties in conducting periodic verification of the installation (tests of the entire installation in place are necessary).

The closest technical solution is the installation for measuring the production rate of oil wells, containing a separator in the form of a cylindrical vessel with a cyclone, settling and outlet sections separated by partitions, two level gauges located in the settling section, a cyclone installed at the inlet of the cyclone section, gas measuring lines and liquids with pressure and temperature sensors and piping placed in them, equipment unit [RU Patent No. 2307930 for the invention “Installation for measuring oil flow rate with Vazhiny oil, gas and water ", IPC E21V47 / 10, G01F15 / 08. Published 10/10/2007 bull. No. 28]. The separator is made horizontally oriented. The partition between the cyclone and settling sections is made in the form of a set of tubes. The partition between the settling and outlet sections is made in the form of an overflow wall. In this case, the liquid measuring line is made in the form of a water measuring line and an oil measuring line, uniting at the outlet of the oil and gas mixture outlet pipe, on which the pump unit and injector are installed in series with the gas measuring line connection unit. A compressor with a frequency drive is installed in the gas measuring line. In the water measuring line, a densitometer, a device for measuring the oil content in water, an automatic and manual samplers, piping for connecting a free gas determination unit, a turbine flow meter, pressure and temperature sensors, and a control valve are installed in series. A density meter, a device for measuring the water content in oil, a manual and automatic samplers, piping for connecting a free gas detection unit, a turbine flow meter, pressure and temperature sensors and a control valve are installed in series in the oil measuring lines. A pressure sensor, a device for measuring liquid droplets, a manual sampler, a mass flow meter and a control valve are installed in series in the gas measuring line.

This installation does not allow the measurement of small flow rates of gas and liquid, which reduces the overall accuracy of the measurement of flow rates of wells. In addition, this installation is structurally complex.

The task to which the claimed technical solution is directed is the development of a measuring installation, which ensures, inter alia, at a low flow rate of liquid and gas, as well as with strong foaming, due to the possibility of working both in a static state with liquid settling, and in the mode direct measurement of the mass and volumetric flow rate of oil well products.

When implementing the claimed technical solution, the problem is solved by achieving a technical result, which consists in reducing the measurement error, expanding the measurement range, determining the parameters of the flow rate of the well’s production in a single measurement.

The specified technical result is achieved by the fact that in the installation for measuring the production rate of oil wells containing an inlet line, a horizontally oriented separation tank with an inlet device of a hydrocyclone type and a level gauge at the inlet connected to the wells, and at the outlet with gas and liquid measuring lines placed in them with flow meters, temperature and pressure measuring instruments and control devices, and an outlet to the collector, according to a utility model, the separation tank is made with a vertical about oriented calibrated measuring capacity and is equipped with a differential pressure sensor between the upper and lower parts of the calibrated measuring capacity, differential pressure sensor between the calibrated measuring capacity and the upper part of the separation tank, as well as a differential pressure sensor between the separation capacity and the outlet to the collector, control devices are made in the form shut-off and control valves with the possibility of proportionally - integral - differential regulation (hereinafter referred to as PID control), When this control device for a gas line is operatively associated with a sensor determining the pressure difference between the separation vessel and the outlet into the reservoir, and regulating device for the liquid line is operatively associated with the level-separation tank.

In addition, a sampling device and a three-way valve connecting the inlet line with the outlet to the collector can be installed on the input line of the installation, and the installation itself is equipped with a volumetric liquid meter.

Performing a separation vessel with a vertically oriented calibrated measuring vessel and supplying it with differential pressure sensors between the upper and lower parts of the calibrated measuring vessel and a differential pressure sensor between the calibrated measuring vessel and the upper part of the separation vessel allows the production of wells to be measured at low productivity (low production wells) in hydrostatic mode.

Supply of the separation tank with a differential pressure sensor between the separation tank and the outlet to the collector and the execution of control devices on the gas and liquid lines in the form of shut-off and control valves with the possibility of PID control, as well as the functional connection of the shut-off and control device on the gas line with a pressure difference detection sensor between the separation tank and the outlet to the collector, and the shut-off and control device on the liquid line with the separation tank gauge reshnost measurements in real time, due to a bypass regulating fluid discharge rate from the separation tank.

The presence on the input line of the installation of a sampling device allows the selection of a representative sample for component studies.

Providing the installation with a volumetric liquid meter allows you to increase the accuracy of measuring the volumetric flow rate of the liquid, and when working together with a liquid flow meter, for example, a Coriolis flowmeter, increase the accuracy of density measurement.

Installing a three-way valve on the inlet line connecting the inlet line with the outlet to the collector makes it possible to work in a hydrostatic mode with liquid settling (with strong foaming).

The drawing shows a hydraulic circuit diagram of the claimed installation.

The installation for measuring the production rate of oil wells contains an input line 1, a horizontally oriented separation tank 2, made with a vertically oriented calibrated measuring tank 3, a gas line 4, a liquid line 5, an outlet to drain 6, an outlet to collector 7, a controller (not shown shown). The separation vessel 2 has an inlet device of a hydrocyclone type 8, a safety valve 9, a level gauge 10, an overpressure sensor 11, a drop collection section 12, a gas filter 13. The calibrated measuring vessel 3 is equipped with a differential pressure sensor 14, the separation membranes of which (not shown) are installed in the upper part and on the bottom of the measuring tank 3, and a differential pressure sensor 15, while one of the separation membranes (not shown) of the sensor 15 is mounted on the separation tank 2. The sensor pressure drop 16 by separation membranes (not shown in the drawing) is communicated with separation tank 2 and exit to the collector 7. A flow meter 17, an overpressure sensor 18, a temperature sensor 19, a shut-off and control valve with PID control 20 are located on the gas line 4 of the installation A water cut meter 21, a flow meter 22, a temperature sensor 23, a shut-off and control valve with the possibility of PID control 24 are located on the liquid line 5 of the installation 24. A volumetric meter can also be installed on the liquid measuring line liquid 25. At the input line 1, a sampling device 26 can be installed. Also, a three-way valve (not shown) can be installed on the input line 1, connecting the input line 1 with the outlet to the collector 7. An overpressure sensor is installed at the outlet to the collector 7 27. All pipelines of the installation are equipped with shut-off and control devices: valves 28-32, valves (not shown in the drawing), check valves 33.

The device operates as follows.

Well production along the inlet line 1 with the shutter 28 closed enters the inlet device of the hydrocyclone type 8 of the separation tank 2, where under the action of centrifugal force the main part of the gas is separated from the liquid. Gas with part of the entrained liquid is directed into the gas pipe of the hydrocyclone, then, passing along the separator, the gas stream enters the drop collection section 12, where liquid droplets are condensed from the gas. The last stage of gas purification is the filter 13, in which the final separation of gas from the dropping liquid occurs. Next, the gas is sent for measurement to the gas flow meter 17. After the measurement is completed, through the open shut-off-control valve 20, which maintains the necessary pressure drop to displace the oil gas flow, with the shut-off-control valve 24 closed, the gas is sent to the outlet to the collector 7.

The liquid with the trapped part of the gas is discharged from the hydrocyclone through the liquid pipe into the stilling compartment of the separation tank. Accumulating in the stilling compartment, the liquid begins to overflow through the separator board, falling onto the separation tray. Spreading over the tray with a layer of no more than 5 mm, the liquid is freed from the gas.

In the hydrostatic measurement mode, the liquid is directed to a calibrated measuring vessel 3, where the mass and volumetric flow rates of the liquid are calculated by the rate of liquid accumulation and the readings of the differential pressure sensors 14 and 15.

When measuring in real time, the liquid is sent to a calibrated measuring tank 3, where upon reaching a predetermined level fixed by the level gauge 10, when the gate valve 31 is closed, it begins to merge through the liquid flow meter 22. After the measurement is completed, the liquid is sent to the outlet to the outlet to the collector 7. When using a volumetric liquid meter 25, the oil-water mixture is sent from a calibrated measuring tank to the measurements through the meter 25.

The fluid drainage rate is set by two systems: the first is to maintain the level of the shut-off and control valve 24 and the level gauge 10, the second is to maintain the pressure drop measured by the sensor 16 and the shut-off and control valve 20. Moreover, during the discharge, the controller software determines this percentage of control valves open , which creates a uniform discharge of liquid through the flow meter 22 and gas through the flow meter 17.

The liquid is drained uniformly at one speed due to the dual-circuit proportionally - integral - differential regulation of the level of the liquid column.

The first circuit controls the level of the liquid column according to the readings of the level gauge 10 or according to the readings of the differential pressure sensors 14 and 15 mounted on a separation tank made with a calibrated measuring tank.

When the liquid level drops below a predetermined limit value at the signal of the controller, the shut-off valve 24 closes by a predetermined percentage. If the level continues to fall, then a smooth closure occurs further until the level stabilizes or begins to grow.

When you start leveling - shut-off valve 24 does not move. If the liquid level exceeds the upper predetermined limit, then the shutoff-control valve 24 begins to open slightly until the level is not stabilized, or does not begin to decline.

Thus, fluctuations in the liquid level occur with decreasing amplitude until the level is stabilized.

The second circuit controls the differential pressure according to the readings of the differential pressure sensor 16, located between the separation tank 2 and the outlet to the collector 7.

The shut-off and control valve 20 maintains the pressure drop necessary to displace the liquid from the separation-measuring tank in case of overfilling, even when the control valve 22 is completely open on the fluid line 5, for example, when the well is high in liquid and low in gas.

During the measurement process with parametric gauges of excessive pressure 18, temperature 19 and 23, water cut 21 take readings.

When using a sampling device 26, open the valve 29 with the valve closed 28 and take a representative sample.

The advantages of the proposed technical solution:

- a wide range of flow rates (1: 100 or more);

- the absence of restrictions on the lower range of well productivity in the liquid;

- the ability to determine all parameters of the flow rate of well production in a single measurement;

- the ability to work in a statistical mode with sedimentation of liquid (with strong foaming);

- direct measurement of mass and volumetric flow rate of the measured medium;

- ease of installation and maintenance (periodic verification) of measuring instruments (flow meters).

The use of modularity of the measuring lines for gas and liquid allows you to quickly upgrade the installation for measuring the flow rate of oil wells for different types of flow meters.

The application of the proposed technical solution will allow you to create an installation with an extended range of measuring oil flow rates and significantly improve the accuracy of measurements, as well as reduce the time for measuring flow rates of wells with low flow rates.

Claims (4)

1. Installation for measuring the production rate of oil wells, containing an inlet line, a horizontally oriented separation tank with an inlet device of a hydrocyclone type and a level gauge connected at the inlet to the wells, and at the outlet with gas and liquid measuring lines with flow meters placed in them, temperature measuring instruments and pressure and control devices, and the outlet to the collector, characterized in that the separation tank is made with a vertically oriented calibrated measuring tank equipped with a differential pressure sensor between the upper and lower part of the calibrated measuring vessel, a differential pressure sensor between the calibrated measuring vessel and the upper part of the separation vessel, as well as a differential pressure sensor between the separation vessel and the outlet to the manifold, while the control devices are made in the form of shut-off and control valves with the possibility of proportional-integral-differential regulation, and the regulating device on the gas line is functionally associated with dates the pressure difference between the separation tank and the outlet to the collector, and the control device on the liquid line is functionally connected to the level gauge of the separation tank. 2. Installation according to claim 1, characterized in that a sampling device is installed on the input line. 3. Installation according to claim 1, characterized in that it is equipped with a volumetric liquid meter. 4. Installation according to claim 1, characterized in that a three-way valve is installed on the input line connecting the input line to the outlet to the collector.

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