RU146825U1 - DEVICE FOR TESTING SEPARATION EQUIPMENT - Google Patents

Abstract

A device for testing separation equipment, including a separation unit connected by a drain pipe to a storage tank, a gas injection unit, a heat exchanger, a control unit designed to form control actions for the heat exchanger connected to the gas pressure sensor and installed on the gas injection line a flow meter designed to control the flow of gas entering the separation unit through the gas injection line on which the dispenser is installed dosing device, a mechanical and sand dosing device, as well as an inlet pressure gauge with a pressure supply pipe and a pressure relief pipe equipped with shutoff valves, the outlet of the separation unit is connected to the gas injection unit equipped with a bypass line through a filter, forming a suction line on which output pressure gauge.

Description

The utility model relates to testing equipment, in particular, to devices for testing separation equipment used for gas production and treatment in the oil and gas industry.

The prior art method for testing a submersible centrifugal gas separator and a stand for its implementation (RF patent No. 2331861 C2, G01M 19/00, 08/20/2008). At a well-known stand, gas separators (HS) are tested in submersible electric pump units for oil extraction from wells. The stand contains a storage tank, a gas-liquid separator, a mixing device, a unit for modeling downhole conditions, a gas separator, a submersible pump. Separation of gas-liquid mixtures by the tested gas separator is carried out at a constant flow rate of liquid entering the modeling unit of the downhole conditions, preventing the appearance of a downward flow of fluid in the annulus, and maintaining a constant gas content in the gas-liquid mixture entering the gas separator and modeling block by creating an upward flow in the annulus. The invention is aimed at simplifying tests, reducing their time and obtaining more reliable results. However, the well-known stand has a large amount of equipment and complexity of execution.

The closest technical solution to the proposed device is a stand for testing separators (GOST 17601-90 "Separators, centrifugal ship. Acceptance and test methods", Moscow, USSR State Committee for Management of Product Quality and Standards, 1990, Fig. 1, p. 3- 7), which includes the following main elements: separator, pumping section of the separator pump, pressure gauge, thermometer, sampling device, tank for separated water and sludge, tank for purified product, pump, tank for raw product, device GUSTs input demulsifier, a circulation pump, means for introducing the pollutant, a device for introducing water, a standard filter separator suction pump section separator device for capacity control, the buffer tank water heater, a flow meter, the shut-off valve. A well-known stand contains a large number of equipment, is complicated in the execution, regulation and maintenance of work in a given range of operating parameters. In this case, the circulation system is open and the pressure in the stand is determined by the pressure at the outlet of the circulation pump unit, i.e. does not allow working in a wide range of operating pressures. Also, the system does not provide for gas-liquid tests, as tests in it can be carried out exclusively on liquids.

The problem to which the proposed utility model is directed is to create a mobile device for testing separation equipment, which is a closed gas circulation system that reduces the requirements for a gas injection unit, for example, compressor or circulating equipment.

The technical result of the utility model is the expansion of the device’s functionality, which consists in the possibility of testing separation equipment not only with liquids, but also with gas-liquid mixtures in a wide range of thermobaric parameters. The proposed device also has a simplified design, which allows testing of separation equipment, the operation of which is accompanied by reduced energy consumption while maintaining operating conditions.

The essence of the utility model is as follows. A device for testing separation equipment includes a separation unit connected by a drain pipe to a storage tank, a gas injection unit, a heat exchanger, a control unit designed to form control actions for the heat exchanger connected to the flowmeter based on the readings received from the temperature sensor on the gas injection line designed to control the flow of gas entering the separation unit through the gas injection line. On the gas injection line, a liquid dispenser, a dispenser of mechanical impurities and sand, as well as an inlet pressure gauge with a pressure supply pipe and a pressure relief pipe equipped with shutoff valves are installed. The output of the separation unit is connected to the gas injection unit, equipped with a bypass line, through a filter, thus forming a suction line on which the outlet pressure gauge is installed

The drawing shows a diagram of the proposed device for testing separation equipment, which consists of:

- separation unit (1);

- gas injection unit (2);

- heat exchanger (3);

- a control unit (4), which, according to the indication received from the temperature sensor, provides a control action for starting the heat exchanger;

- flow meter (5);

- temperature sensor (6);

- liquid dispenser (7);

- batcher of mechanical impurities or sand (8);

- a drain pipe (9) located in the lower part of the separation unit with shutoff valves;

- a storage tank designed to drain the liquid from the separation unit (10);

- input (11) and output (12) manometers;

- pressure supply pipe (13) with shutoff valves;

- pressure relief pipe (14) with shutoff valves;

- filter (15);

- a bypass line (16) with shutoff valves.

To implement the proposed utility model, standard equipment was used. As a gas injection unit, for example, either a compressor or a circulation device can be used.

The work of the proposed device is as follows.

Before assembling the device, the nodes are tested for strength. In the proposed device for testing separation equipment, tests can be carried out both with a liquid, when using liquid separation blocks in it, and with mechanical impurities, when using a desender or sand trap as a part of the device, or with a liquid together with mechanical impurities. The closure of the shutoff valves is checked on the drain pipe (9), the pressure supply pipe (13) and the pressure relief pipe (14). Then, liquid is supplied to the dispenser (7) and mechanical impurities are supplied to the dispenser (8). If necessary, (for example, the tank remained filled after previous tests), the liquid is drained from the storage tank (10) and cleaned of mechanical impurities. Open the shutoff valves on the pressure supply pipe (13) and fill the stand with gas from the pressure source, creating first a pressure of several atmospheres, then check the tightness of the entire device. After that, the pressure is raised to the required value specified by the test conditions. In this case, the operability of the inlet (11) and outlet (12) manometers is checked, with the help of which the pressure at the inlet and outlet of the separation unit (1) is controlled. Upon reaching the pressure value specified by the experimental conditions, the losses are determined, the stop valves on the pressure supply pipe are closed (13). Turn on the gas injection unit (2) and set the required gas flow rate, which is controlled by the readings of the flow meter (5). SUBSTANCE: liquid and mechanical impurities are supplied to the device from dispensers (7) and (8) with specified costs. The work occurs in the mode selected by the experimental conditions. The operating time under the chosen conditions of the experiment depends on the design of the separation unit (1) - the availability of an automatic system for draining the liquid and removing mechanical impurities; from the flow of liquid and mechanical impurities entering the device from the dispensers (7) and (8) - depends on the speed of filling the separation unit with separation products. At the same time, pressure values are recorded on the input (11) and output (12) manometers, the pressure difference on the separation unit is determined by the difference in values of which.

The degree of separation is determined by the ratio between the quantities of separated and injected liquid (with the addition of mechanical impurities.

The performance of the separation unit is determined based on the conditions of a sharp decrease in the degree of separation, both at small and at high gas flow rates.

Depending on the design and execution of the separation unit (1), an automatic or manual system for draining the liquid and removing mechanical impurities through the drain pipe (9) with shut-off valves into the storage tank (10) can be used.

During the operation of the device, it is possible to change the values of the liquid flow rate and / or mechanical impurities using the dispensers (7) and (8), and it is also possible to stop the gas injection unit (2).

At the end of the operation of the device, after stopping the gas injection unit (2), the shutoff valves on the pressure relief pipe (14) are opened and the pressure is reduced to atmospheric. If necessary, the separation unit (1) can be dismantled and mounted again.

In the case of prolonged operation, the heat exchanger (3) is used to maintain a constant temperature regime. For an automatic system for maintaining the temperature regime of operation, the device uses a control unit (4) with a temperature sensor (6) installed on the discharge line of the device.

During the tests, depending on the selected mode of the experiment, (gas flow, amount of liquid and / or solids present in the gas stream, and pressure), the main characteristics of the separation unit are evaluated:

- performance of the separation unit;

- degree of separation;

- liquid content at the outlet of the separation unit;

- pressure loss (pressure loss on the separation unit).

In the case of tests of separation blocks working only with liquid, a dispenser of mechanical impurities (sand) may not be included in the composition of the proposed device.

In the case of tests of separation blocks working only with mechanical impurities (sand) - desenders or sand traps, there is no need to include a liquid dispenser in the device.

Tests of the proposed utility model were carried out as follows.

Before the study, the filter mass was measured, which amounted to 0.500 kg. Then the stand was filled with air from a high pressure source to 2 atmospheres. At the same time, the manometers were checked for operability. According to the readings of the input pressure gauge, the tightness of the system was recorded (a pressure value of 2 atmospheres is maintained for 10-15 minutes). Further, the pressure value rose to the necessary value, i.e. determined by the conditions of the experiment, for example, up to 15 atmospheres, which was also recorded according to the readings of the input pressure gauge. After that, the system enters standby mode and monitors the process for, for example, 15 minutes, after the specified time it has been recorded that the pressure value is kept at 15 atmospheres. Then, a gas injection unit was turned on and a gas flow rate of 150 m ³ / h was set, the value of which was controlled by a gas flow meter. The control unit (4) was provided with a mode of maintaining the gas temperature, 20 ° C ± 0.5 ° C. With a frequency of 1 minute, the temperature sensor (6) was interrogated by block (4). If the gas temperature exceeds a predetermined value (20 ° C), block (4) formed a control action for the heat exchanger, starting the gas cooling process to a temperature value of 20 ° C.

In the event that the gas temperature remained below a predetermined value (20 ° C), block (4) formed a control action for the heat exchanger, providing gas heating to a temperature value of 20 ° C. Upon reaching a temperature of 20 ° C, a liquid with a flow rate of 0.9 kg / h and mechanical impurities from a mechanical impurity dispenser with a flow rate of 0.009 kg / h were fed into the gas stream from the dispenser. The device worked in this mode for 1 hour. At the same time, with a frequency of 1 minute, the input pressure gauge (11) recorded the pressure value at the inlet of the separation unit, which amounted to 20 atm, and the output pressure gauge (12) at the output of the separation unit. The pressure should be 19.9 atm. and the pressure drop across the separation device is 0.1 atm. A filter (15) installed in front of the gas injection unit allows trapping the remaining particles of mechanical impurities and liquids. In this case, pressure is measured in front of and after the filter, and then the differential pressure. After the study, the filter is removed and its mass is measured, which during the experiment was 0.800 kg. Then the liquid from the filter is evaporated and its mass is again measured, which amounted to 0.501 kg. After calculating the change in the mass of the filter, as the difference between the mass after evaporation and the initial one before the experiment, 0.001 kg was obtained. Thus, the separation coefficient of mechanical impurities was: 0.008 / 0.009 = 0.889 (or as a percentage of 88.9%). The mass of evaporated liquid was 0.299 kg. The liquid separation coefficient was: (0.900-0.299) / 0.900 = 0.668 (or as a percentage of 66.8%).

To repeat the study, the conditions of the experiment may be changed. Studies were also conducted with a changed gas flow rate, for example, from 150 m ³ / h to 170 m ³ / h, which resulted in a separation coefficient of 0.652 for liquids and 0.850 for mechanical impurities, that is, it was found that the degree of separation is deteriorating .

With a decrease in gas flow from 170 m ³ / h to 130 m ³ / h, new liquid separation coefficients of 0.954 and mechanical impurities of 0.905 were obtained, that is, they established an improvement in the degree of separation.

Thus, conducting research using the proposed device allows you to choose the optimal performance modes of the separation unit, both depending on the gas flow rate, and depending on the flow rate of the liquid and mechanical impurities supplied to the gas stream. °

After the study, pressure is released from the system and liquid and mechanical impurities are removed from the storage tank.

Claims (1)

A device for testing separation equipment, including a separation unit connected by a drain pipe to a storage tank, a gas injection unit, a heat exchanger, a control unit designed to form control actions for the heat exchanger connected to the gas pressure sensor and installed on the gas injection line a flowmeter designed to control the flow of gas entering the separation unit through the gas injection line on which the dispenser is installed dosing device, a mechanical and sand dosing device, as well as an inlet pressure gauge with a pressure supply pipe and a pressure relief pipe equipped with shutoff valves, the outlet of the separation unit is connected to the gas injection unit equipped with a bypass line through a filter, forming a suction line on which output pressure gauge.

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