RU129553U1 - STAND FOR RESEARCH OF CONDITIONS OF LIFT LIFT WITH USE OF GAS - Google Patents

Abstract

A stand for studying the conditions of liquid lifting using gas, including at least one pipe lift string, a fluid supply and control unit, a compressor, input devices to the column and the discharge from the column, a separator, the inlet of which is connected by a connecting pipe to the drain from columns, the separator fluid outlet is connected via a fluid supply line to an inlet intended for supplying liquid to the input device to the gas-liquid mixture column through the supply and control unit liquid supply, the gas outlet of the separator is connected to a means for supplying and regulating a gas flow rate, including at least one pipe for excess gas pressure and one pipe for gas discharge, and is connected via a gas supply pipe to the compressor inlet, the output of which is connected to the input of the input device in the column of gas-liquid mixture intended for gas supply, characterized in that the stand further comprises a control unit for interrogating the first and second pressure sensors installed at the inlet and outlet e, respectively, of the lift column, the means for supplying and regulating the gas flow additionally contains two control valves, one of which is designed to open and pump gas into the stand, the other control valve is designed to open and discharge gas from the stand, both control valves are connected to gas supply pipelines in stand and gas discharge from the stand, the control inputs of the control valves are connected to the first and second outputs of the control unit.

Description

The utility model relates to techniques for studying gas production processes in the oil and gas industry related to the study of gas-liquid flow processes in vertical and deviated gas wells.

A bench is known from the prior art for studying the conditions of liquid lifting using gas from gas, condensate and oil field wells (RU 48580, U1, E21B 47/00, published on October 27, 2005). The well-known stand is designed to study the conditions for lifting gas and liquid along the pipe risers. The stand includes one or more columns of pipes of various diameters, a node for supplying and regulating the flow of liquid, a means for supplying and regulating the flow of gas, which includes a compressor, a device for introducing and discharging a gas-liquid mixture into the column, and a separator having outlets for liquid and gas, means for draining liquid and gas from the installation. The pipeline is equipped with a gas overpressure pipe and a gas discharge pipe. In the known solution, during the experiment, gas is pumped into the bench until a predetermined pressure is established in the elevator column, after which the gas is circulated in a closed cycle using a compressor. During the experiment, the gas in the stand is heated due to friction in the compressor elements, which leads to an increase in pressure in the entire stand. The known stand does not allow you to control the gas pressure in a given range and maintain it at the entrance to the elevator column or at the exit of the elevator column.

The prior art bench for researching the conditions of liquid lifting using gas (RU 121001, U1, E21В 47/00, publ. 10.10.2012), which is the closest to the proposed technical solution. A well-known stand includes an elevator pipe string, a fluid supply and control device, a gas supply and flow control unit that includes a compressor, an input and output device from the column, a separator, pressure measuring devices in the pipe elevator at the entrance to the elevator column pipes or at the exit of the tubing string. The known stand does not provide the ability to control and maintain the gas pressure in a predetermined range at the entrance to the elevator column or at the exit of the elevator column.

The task to which the proposed utility model is aimed is to create a bench for studying the conditions of liquid lifting using gas, which eliminates the aforementioned drawback, and improves the reliability of the obtained measurement results.

The technical result achieved by the proposed stand is to provide control and increase the reliability of the results in a given measurement range at the entrance to the elevator column or at the exit from it.

The technical result of the proposed utility model is achieved due to the fact that in the stand for the study of the conditions of liquid lifting using gas, which includes at least one lift pipe string, a unit for supplying and regulating the flow of liquid, a compressor, input devices into the column and discharge from the column , a separator, the inlet of which is connected by a connecting pipe with a device for draining from the column, the outlet for the liquid of the separator is connected by means of a liquid supply pipe to an inlet intended for supplying liquid a device for introducing a gas-liquid mixture into the column through a fluid supply and control unit, the separator gas outlet is connected to a gas supply and control means, including at least one gas overpressure pipe and one gas discharge pipe, and is connected via a gas supply pipe with the compressor input, the output of which is connected to the input of the input device into the gas-liquid mixture column, intended for gas supply, a control unit is additionally introduced, which provides the interrogation of the first and second of pressure sensors installed at the inlet and outlet of the elevator column respectively, the gas supply and control means additionally contains two control valves, one of which is designed to open and pump gas into the stand, the other control valve is designed to open and discharge gas from the stand, both control valves are connected to pipelines for gas supply to the stand and gas discharge from the stand, control inputs of control valves are connected to the first and second outputs of the control unit.

The proposed utility model is illustrated in the drawing, which shows a specific example of the implementation of the stand for the study of the conditions for lifting liquid using gas.

The bench for studying the conditions of liquid lifting using gas consists of an elevator column (1) installed in a vertical or inclined position. An input device into the column (2) and a device for removing gas-liquid mixture from the column (3), respectively, are installed in the upper and lower parts of the elevator column. The unit for supplying and regulating the flow of fluid (4) allows for the operation of the stand in a closed cycle. The stand also includes a compressor (5), a separator (6), gas supply pipelines (7) and liquid (8), respectively. The first and second pressure sensors (9, 10) are installed at the inlet to the elevator column and at the outlet of the elevator column, respectively. The control unit (11) interrogates the pressure sensors and, based on the results obtained, creates a control action on the first or second control valves (12, 13) of the stand, respectively, installed on the gas supply pipelines (14) to the stand and gas discharge from the stand (15), respectively. Shutoff valves (16) are installed on the pipeline for supplying liquid to the stand (17). In the lower part of the elevator column, a nozzle is provided for draining the liquid from the stand with shutoff valves (18). The measuring equipment (gas and liquid flow meters, differential pressure transducers, pressure sensors, temperature sensors) used in the stand can be installed to control the operating parameters of the stand at the entrance to the elevator column or at the exit of the elevator column, as well as in other parts of the stand.

As an example of the execution of the control unit, a pneumatic proportional-integral regulating device with a local master, FR0092, manufactured by LLC Tizpribor Plant, can serve.

Before starting work, the stand is connected to a high-pressure gas source by a gas supply pipeline to the stand (14). In the control unit (11) enter the pressure value necessary for the experiment, at the entrance to the elevator column (1) or at the exit from it. During operation of the stand, the control unit (11) interrogates one of the pressure sensors (9) or (10), the readings of which are compared in the event of a discrepancy between the set pressure value and measured by an amount exceeding the permissible interval, the control unit submits to the control valve (12) control effect on the opening. Gas begins to be pumped into the stand. At predetermined time intervals, the control unit (11) interrogates one of the pressure sensors (9) or (10). Upon reaching the set pressure value in the stand, the control unit (11) transfers to the control valve (12) a control action on closing. After that, the compressor (5) is turned on. In this case, gas from the separator (6) is sucked in by the compressor (5), and then it is supplied through a gas flow meter (not shown in the drawing) and a device for introducing a gas-liquid mixture (2) into the elevator column into the lower part of the elevator column (1). Gas entering the elevator column (1) rises through the elevator column to the upper part of the elevator column (1) and through the device (3) for discharging the gas-liquid mixture from the elevator column through a pipeline enters the separator (6) and then to the compressor (5) . The gas filling the stand begins to circulate through the stand in a closed loop. In automatic mode, the pressure values set by the experimental conditions during operation of the test bench are set and maintained, controlling them. If the measured value of the gas pressure deviates from the pressure set according to the experimental conditions, the control unit (11) creates a control action on the control valve (12), which opens and pumps gas into the stand, or on the control valve (13), which opens and discharge of gas from the stand. Thus, the pressure in the stand is maintained in the range specified by the experimental conditions. The control action on the control valve may be, for example, either electric or pneumatic.

The required amount of fluid is supplied to the fluid supply and control unit (4) through the fluid supply pipe to the stand (17), by opening the shutoff valves (16). After this, the shut-off valve (16) closes, and the liquid then enters the gas-liquid mixture input device (2) into the elevator column, in which the liquid is mixed with gas, and the gas-liquid mixture rises through the elevator column (1) to its upper part under the influence of gas pressure (1) . Having reached the upper part of the pipe tubing string (1), the gas-liquid mixture first enters the gas-liquid mixture removal device (3), and then enters the separator (6) through the connecting pipe.

In the separator, the liquid is separated from the gas and flows through the pipeline (8) to the supply and control unit for the flow of liquid (4), and the gas through the pipeline (7) enters the compressor (5). Thus, the liquid circulates in a closed cycle.

After the experiment, the liquid is drained through the drain pipe with a locking device (18) located in the lower part of the elevator column.

During a specific experiment, it is advisable to measure the pressure in predetermined sections of the column (1) with pressure gauges or differential pressure gauges. After making the required measurements, it is possible to change the technological parameters of the stand operation mode: set the pressure by the control unit, gas flow rates using the compressor (5), and the liquid using the fluid supply and control unit (4), or stop the stand by removing the liquid from columns into the recycling system.

Claims (1)

A stand for studying the conditions of liquid lifting using gas, including at least one pipe lift string, a fluid supply and control unit, a compressor, input devices to the column and the discharge from the column, a separator, the inlet of which is connected by a connecting pipe to the drain from columns, the separator fluid outlet is connected via a fluid supply line to an inlet intended for supplying liquid to the input device to the gas-liquid mixture column through the supply and control unit liquid supply, the gas outlet of the separator is connected to a means for supplying and regulating a gas flow rate, including at least one pipe for excess gas pressure and one pipe for gas discharge, and is connected via a gas supply pipe to the compressor inlet, the output of which is connected to the input of the input device in the column of gas-liquid mixture intended for gas supply, characterized in that the stand further comprises a control unit for interrogating the first and second pressure sensors installed at the inlet and outlet e, respectively, of the lift column, the means for supplying and regulating the gas flow additionally contains two control valves, one of which is designed to open and pump gas into the stand, the other control valve is designed to open and discharge gas from the stand, both control valves are connected to gas supply pipelines in stand and gas discharge from the stand, the control inputs of the control valves are connected to the first and second outputs of the control unit.

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