RU2804451C1 - Dosing device for corrosion and hydrate inhibitor - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: devices for introducing an inhibitor into a pipeline for cleaning wells in order to prevent or reduce corrosion and hydrate formation in them. The corrosion inhibitor and hydrate formation dosing device comprises a pipeline system with shut-off, shut-off-and-regulating and control and measuring equipment hermetically connected to each other, a power supply and control unit with a program for an electronic computer EC 4, wireless communication equipment, a filter 17. The indicated pipeline system includes: the main pipeline for supplying the inhibitor from the pump of the gas treatment unit 7, the inlet pipeline 2, the main pipeline 10, the bypass pipeline 11, the output pipeline 3 and the main pipeline for supplying the inhibitor to the well 8. At the same time, the main pipeline for supplying the inhibitor from the pump of the gas treatment plant 7 is hermetically connected on the one part to the pump of the gas treatment plant, and on the other part is hermetically connected to the inlet pipeline 2, equipped with a ball valve 13. On the other part, the inlet pipeline 2 is hermetically connected to the main pipeline 10 by means of a filter 17 located on the main pipeline, also equipped with an electromagnetic remote-controlled valve 12, a throttle 18, a check valve 16 and control and measuring equipment - pressure sensors 19, 20 and hermetically connected on the other part, with the outlet pipeline 3, equipped with a ball valve 15. The outlet pipeline 3, on the other part, is hermetically connected to the main pipeline for supplying the inhibitor to the well 8. The bypass pipeline 11 is equipped with a ball valve 14 and is hermetically connected on one part to the main pipeline 10 in front of the electromagnetic remote-controlled valve 12, and on the other part it is hermetically connected to the main pipeline 10 after the throttle 18, installed separately from the electromagnetic remote-controlled valve 12 with the possibility of replacement. Also, the device is additionally equipped with external control and measuring instruments 5, which are temperature sensors of the corrosion inhibitor and hydrate formation 21 and the temperature in the well 22, located in the area of the wireless connection of the power supply and control unit with the computer program 4, which performs real-time control of the electromagnetic remote-controlled valve 12, adjusting the dosing and consumption of corrosion inhibitor and hydrate formation according to pressure and temperature indicators of corrosion and hydrate formation inhibitor and temperature in the well received from the indicated pressure and temperature sensors 19, 20, 21, 22, and self-diagnosis with the ability to control contamination filter 17, the operability of the electromagnetic remote-controlled valve 12, and the reconfiguration of the power supply and control unit 4.

EFFECT: increased reliability of the corrosion inhibitor and hydrate formation dosing device and wells, adjustable dosing and consumption of the corrosion and hydrate formation inhibitor, simple design.

4 cl, 11 dwg, 1 ex

Description

The invention relates to the oil and gas industry, namely to devices for introducing an inhibitor into a pipeline for cleaning wells in order to prevent or reduce corrosion and hydrate formation in them.

During the operation of wells in oil and gas condensate fields, a process of hydrate formation takes place due to watering of the bottomhole zone, removal of liquid with a simultaneous decrease in temperature. To combat hydrate formation, methods and devices for continuous dosed supply of a complex corrosion and hydrate formation inhibitor into wells are used.

From the prior art, an inhibitor dosing unit is known, containing a main line and a bypass line, the main line includes a pipeline and a first ball valve, a filter, a second ball valve, a two-way solenoid valve, a third ball valve, a check valve, a pressure gauge, and a fourth installed sequentially along its course. ball valve, the bypass line includes a pipeline and a fifth ball valve, a throttle package, a sixth ball valve installed in series along its course, and the bypass line begins with the first branch from the main line between the filter and the second ball valve, ends with the second branch between the third ball valve and the check valve , and in the area of the first and second branches, pressure sensors are installed with the ability to determine the pressure in the main pipeline. (RF patent No. 2740239, F17D 3/12, published 01/12/2021).

From the prior art there is known an automatic inhibitor supply system, taken as the closest analogue (prototype), containing a pipeline system with shut-off, shut-off and control, safety and control equipment, hermetically connected to each other, a control unit with a computer program and power supply, wireless communication equipment (RF patent No. 2637245, E21B 37/06, F17D 3/12, published 12/01/2017).

The main disadvantages of the known inhibitor supply system and inhibitor dosing unit are:

- low reliability, which entails hydration of the well, its shutdown and, as a consequence, excessive consumption of the inhibitor in the process of destruction of hydrates;

- lack of ability to work offline;

- lack of self-diagnosis of the control system;

- low accuracy of inhibitor dosing, which leads to its overconsumption and off-design well operation;

- lack of automatic maintenance of a given inhibitor flow rate, regardless of the temperature in the inhibitor pipelines and the temperature in the well;

- relative high cost of manufacturing and installation, due to the use of complex and expensive equipment;

The technical result consists in increasing the reliability and trouble-free operation of the Device, providing controlled dosing and consumption of a corrosion and hydrate formation inhibitor, as well as simplicity of design, while ensuring increased reliability of the well stock.

The desired result is achieved by the fact that the Dosing Device for a corrosion and hydrate formation inhibitor contains a pipeline system with shut-off, shut-off and control and control equipment, hermetically connected to each other, a power supply and control unit with a program for an electronic computer, wireless communication equipment, a device additionally equipped with a filter, the said pipeline system includes: a main inhibitor supply pipeline from the gas treatment plant pump, an inlet pipeline, a main pipeline, a bypass pipeline, an outlet pipeline and a main inhibitor supply pipeline to the well, while the main inhibitor supply pipeline from the treatment plant pump gas on the one hand, it is hermetically connected to the pump of the gas treatment installation, and on the other hand, it is hermetically connected to the inlet pipeline, equipped with a ball valve; the inlet pipeline, on the other hand, is hermetically connected to the main pipeline by means of a filter located on the main pipeline, also equipped with an electromagnetic remote-controlled valve , throttle, check valve and control and measuring equipment - pressure sensors and hermetically connected on the other side to the outlet pipeline equipped with a ball valve, the outlet pipeline on the other side is hermetically connected to the main pipeline supplying the inhibitor to the well, the bypass pipeline is equipped with a ball valve and hermetically connected on the one hand with the main pipeline in front of the electromagnetic remote-controlled valve, and on the other hand, it is hermetically connected to the main pipeline after the throttle, installed separately from the electromagnetic remote-controlled valve and with the possibility of replacement, the device is also additionally equipped with external control and measuring instruments, which are sensors for the temperature of the corrosion and hydrate formation inhibitor and the temperature in the well, located in the range of wireless communication between the power supply and control unit and the computer program, which exercises real-time control of the electromagnetic remotely controlled valve, regulating the dosage and flow rate of the corrosion and hydrate formation inhibitor according to pressure indicators and indicators of the temperature of the corrosion inhibitor and hydrate formation and the temperature in the well, received from the specified pressure and temperature sensors, and self-diagnosis with the ability to monitor filter contamination, the performance of the electromagnetic remotely controlled valve and reconfigure the power and control unit, in addition, the power and control unit with a program for The computer contains non-volatile power and is installed at the minimum permissible distance, which is determined based on the layout of the equipment, from the mechanical unit, which includes the main pipeline with the equipment installed on it; the computer program for the power supply and control unit ensures autonomous operation and transmits data to the automated workstation Operator's workstation for wireless communication via SMS messages.

In fig. 1 shows a block diagram of the Dosing Device for a Corrosion and Hydrate Formation Inhibitor; FIG. 2 shows a graph of changes in the consumption of corrosion inhibitor and hydrate formation versus temperature; FIG. Figure 3 shows an example of a dosing device for a corrosion and hydrate formation inhibitor installed at the service site of gas well No. 3107 of UKPG-3 of the Orenburg oil and gas condensate field (OGCF) (mechanical block with inlet and outlet pipelines), FIG. Figure 4 shows an example of a Dosing Device for a corrosion and hydrate formation inhibitor installed at the service site of gas well No. 3107 of the Orenburg Oil and Gas Condensate Processing Unit No. 3107 (control unit with a computer program and power supply), FIG. 5 shows an example of displaying information on the operator's workstation; Fig. 6 shows a graph of pressure deviation; FIG. 7 shows the dialog box of the operator's workstation - Normal state, in Fig. 8 shows the operator's workstation dialog box - Trend Window; Fig. Figure 9 shows the operator's workstation dialog box - Timeout for receiving SMS messages (SMS), Fig. 10 shows the dialog box of the operator's workstation - Warning alarm; in FIG. Figure 11 shows the operator's workstation dialog box - Warning alarm.

The corrosion and hydrate formation inhibitor dosing device includes the following structural elements:

1 - mechanical block;

2 - inlet pipeline;

3 - outlet pipeline;

4 - control unit with a program for a computer and power supply;

5 - external instrumentation;

6 - operator's workstation;

7 - main inhibitor supply pipeline from the gas treatment unit;

8 - main pipeline for supplying inhibitor to the well;

9 - well service area;

10 - main pipeline;

11 - bypass pipeline;

12- solenoid remote-controlled valve (PCV 01);

13- ball valve KSh1;

14 - ball valve KSh2;

15 - ball valve KSh3;

16 - check valve;

17 - filter;

18 - throttle D;

19 - PT1 - pressure sensor in the inhibitor line;

20 - PT2 - pressure sensor in the well;

21 - TEi - inhibitor temperature sensor;

22 - Tec - temperature sensor in the well.

The corrosion and hydrate formation inhibitor dosing device (hereinafter referred to as the “Device”), for example, installed in September 2022 at the service site of well No. 3107 UKPG-3, contains a pipeline system, with the mechanical unit 1 located on a stand in close proximity to wells and connected by inlet 2 and outlet 3 pipelines to the main pipelines: supplying inhibitor 7 from the pump of the gas treatment unit (hereinafter referred to as the “GTP”) and supplying inhibitor 8 to the well with throttle 18 installed on them, shut-off, shut-off and regulating, safety, filter , control and measuring equipment, a combined non-volatile control unit with a program for a computer and power supply 4, an operator's workstation 6, external control and measuring instruments 5, a control unit 4 located in close proximity and a filter 17 for mechanical cleaning of the inhibitor.

External control and measuring devices 5 are temperature sensors 21 (TEi), 22 (TEc), and are located in the wireless communication range of the control unit with the computer program and power supply 4, while the temperature sensor 21 of the inhibitor is air temperature, and the temperature sensor 22 in the well - soil temperature.

The pipeline system includes a main inhibitor supply pipeline 7 from the gas treatment plant pump, an inlet pipeline 2, a main pipeline 10, a bypass pipeline 11, an outlet pipeline 3 and a main inhibitor supply pipeline 8 to the well, hermetically connected to each other via adapters. The main pipeline for supplying inhibitor 7 from the gas treatment facility provides the supply of a corrosion and hydrate formation inhibitor (hereinafter referred to as the “inhibitor”) from the gas treatment facility through the main pipelines via a pump (not shown in the figure) at a constant flow rate to a group of several wells. The inlet pipeline 2 is equipped with a shut-off ball valve 13, which is located in close proximity to the main inhibitor supply pipeline 7 from the gas treatment unit pump and ensures shut-off of the Device in case of replacement of the throttle 18, faulty electromagnetic remote-controlled valve 12 (hereinafter referred to as the “valve”), cleaning the filter 17 in the mechanical block 1. The main pipeline 10 is equipped with a filter 17, which is located in the mechanical block 1 and provides the degree of purification of the inhibitor - up to 20 microns, with a valve 12, which is located in the mechanical block 1 and provides a given inhibitor flow rate taking into account the current pressure drop on it, according to a given control algorithm of the program for the computer of the control and power unit 4, the throttle 18, which is located in the mechanical block 1 and ensures the passage of a given volume of inhibitor and the check valve 16, which is located in the mechanical block 1 and prevents the reverse flow of the inhibitor, sequentially located, and is also equipped with control and measuring instruments: pressure sensor 19 in the inhibitor pipeline and pressure sensor 20 in the well (RT 1 and PT 2), which are located in the mechanical block 1 and provide pressure control before and after valve 12 (PCV 01), while the valve 12 regulates the dosage and consumption of the inhibitor, not only according to pressure indicators, but also according to the temperature indicators of the inhibitor and the temperature in the well, received from pressure and temperature sensors.

The bypass pipeline 11 is equipped with a shut-off ball valve 14, which is located in the mechanical block 1 and ensures the passage of the inhibitor after the filter 17 in the event of failure of the valve 12 (PCV 01) with the ball valves 13 and 15 closed.

Output pipeline 3 is equipped with a shut-off ball valve 15, which is located in close proximity to the main inhibitor supply pipeline 8 and ensures shut-off of the Device in the event of replacing the throttle 18, faulty valve 12, or cleaning the filter 17 in the mechanical block 1.

The main inhibitor supply pipeline 8 ensures the supply of inhibitor from the outlet pipeline 3 to the well to prevent corrosion and hydrate formation. Each shut-off ball valve 13, 14, 15 is a prefabricated structure consisting of a body with a locking device installed in it in the form of a ball plug with sealing elements, a spindle with a seal, and a handle. The throttle 18 is a tube with union nuts at the ends with a seal, for example, of the Swagelok type, and a nozzle installed in its cavity, which has a calibration hole of a given diameter. The throttle 18, installed separately from the valve 12, provides unloading of the valve 12 by pressure difference, and, as a result, there are no increased requirements for its design, which makes it possible to use the valve 12 from different manufacturers.

Throttle 18 is installed separately from valve 12 and with the possibility of replacing throttle 18 without stopping the operation of the Device.

Valve 12 is a known solenoid remotely controlled valve.

The filter 17 for mechanical cleaning of the inhibitor is, for example, a filter that includes a cylindrical housing with a filter element, a distributor, a mounting pin, a pressure washer and a nut installed in its cavity; a cover is installed in the upper part of the housing with a mounting mounting bracket, in the lower part The housing has a drain screw installed to remove the working medium from the housing.

Instrumentation devices 19 (RT 1) and 20 (RT 2) are pressure sensors, for example, of the Metran-150 type.

The control unit with the computer program and power supply 4 is explosion-proof, with non-volatile power, with wireless communication and is installed at the minimum permissible distance from the mechanical unit 1, which is determined based on the layout of the equipment, and contains power equipment in the form of an energy source and battery , control and communication equipment in the form of a controller (modem), which allows you to regulate the dosage and consumption of the inhibitor according to temperature indicators: inhibitor temperature,

temperature in the well, including automatic maintenance of a given inhibitor flow rate, taking into account the temperature in the inhibitor pipelines and the temperature in the well, using a computer program, including, among other things, an inhibitor flow algorithm, a diagnostic algorithm Devices for self-diagnosis in real time, including including monitoring the contamination of the filter 17, monitoring the performance of the valve 12 and reconfiguring the control and power unit 4, and wireless communication equipment for communication with the operator's workstation 6, which allows the transfer of data received from instrumentation devices 19, 20, 21 and 22, processed data and processing result data via a computer program to a centralized control center via SMS, while reconfiguring the control unit with the computer program and power supply 4 to a different inhibitor supply range is carried out by replacing the throttle 18.

Methanol (95-99.6%) is used as an inhibitor.

The Device uses accessible and simple materials and equipment that have high reliability and maintainability - duration between failures, such as pipelines, throttles, ball valves, valves made of non-magnetic material, energy equipment in the form of a source (solar battery) and energy storage, control equipment and communications in the form of a controller (modem).

The corrosion and hydrate formation inhibitor dosing device operates in autonomous and automatic mode as follows.

Mechanical unit 1 with separately installed external control and measuring equipment 5 is mounted directly on the well servicing site 9 and connected to the existing main inhibitor supply pipeline 7 from the gas treatment plant pumping unit by inlet pipeline 2 through the shut-off ball valve 13 and output pipeline 3 through the shut-off ball valve 15.

During normal operation of the Device, the movement of the inhibitor is carried out along the main pipeline 10 through the filter 17 for mechanical cleaning of the inhibitor, pressure sensor 19 with the ball valve 13 and 15 open, to valve 12, then through throttle 18, check valve 16 and pressure sensor 20 to the outlet pipeline 3, while the ball valve 14 on the bypass pipeline 11 is closed. When electrical voltage is applied, the controller installed in the control unit with the computer program and power supply 4, using the computer program, analyzes the input parameters and carries out self-diagnosis of the Device according to the indicators of pressure sensors 19 (RT 1), 20 (RT 2) and temperature sensors 21 ( TEi), 22 (TEc), in automatic mode in real time, calculating the time of opening and holding the valve actuator 12 in the open position to supply a given portion of the inhibitor through the throttle 18, and also adjusts the given inhibitor flow rate by controlling the position of the valve actuator 12, regulating the dosage and consumption of the inhibitor, while displaying information on the operator's workstation 6, transmitted wirelessly, for example,

Information: Normal condition,

Information: Trend window,

Information: SMS reception timeout,

Information: Warning alarm.

If an emergency situation occurs, for example, detection of a malfunction of valve 12 (failure of the electric drive - valve 12 is closed), the controller gives a signal to turn off valve 12 and the movement of the inhibitor is carried out through the bypass pipeline 11 through the open valve 14. The operator's workstation 6 displays current information in in real time, for example, about the current malfunction and information about the need to repair valve 12.

Repair or replacement of valve 12, repair of the main pipeline 10, cleaning of the filter 17, as well as transfer of the Device to another inhibitor supply range (by replacing the throttle 18) is carried out with the ball valves 13 and 15 closed.

During the operation of the Device, the controller, in accordance with the specified algorithm of the computer program, periodically conducts self-diagnosis of the Device, including monitoring the contamination of filter 17 for mechanical cleaning of the inhibitor, monitoring the performance of valve 12, monitoring the opening time of valve 12, with the display of current information on the workstation. operator 6.

The device is designed for operation at ambient temperatures down to minus 45°C without the use of heating, since the equipment used corresponds to the climatic version UHL1, and operating pressure up to 10.0 MPa.

The tests carried out on the Device confirmed the correctness of the design and technological solutions aimed at increasing the reliability of well operation, simplicity of design, ensuring high reliability and reliability of the Device, and ensuring the most accurate inhibitor consumption.

Accurate flow and dosing of the inhibitor is ensured due to the automatic control mode - adjusting the flow and dosing according to the developed algorithm of the computer program in real time, which includes, among other things, regulation of the inhibitor flow according to the temperature indicators of the inhibitor and the temperature in the well, received from temperature sensors ,

regulation - automatic adjustment not only for methanol pressure, but also for ground temperature, setting the time the valve is open and the number of valve openings - the inhibitor supply range when using one standard size of throttle is up to 4 l/h, the actual error is up to 3%.

Example of concrete implementation

The device was installed on 09.2022 at the gas well maintenance site No. 3107 of UKPG-3 of the Orenburg oil and gas condensate field.

Mechanical unit 1 is installed on a rack in close proximity to the well, with separately installed external control and measuring equipment 5, at the well service area 9 and connected to the main inhibitor supply pipeline 7 from the gas treatment plant pumping unit by inlet pipeline 2 through shut-off valve 13 and outlet pipeline 3 through shut-off valve 15 to the main pipeline for supplying inhibitor 8 to the well.

During normal operation of the Device, the inhibitor moves from the main inhibitor supply pipeline 7 from the gas treatment plant pump, through the inlet pipeline 2, open valve 13 along the main pipeline 10 through filter 17, pressure sensor 19, to valve 12, then through throttle 18, check valve 16 and a pressure sensor 20 through the outlet pipeline 3, an open valve 15 into the main pipeline for supplying the inhibitor 8 to the well, while the bypass pipeline 11 with the valve 14 installed on it is closed.

When electrical voltage is applied, the controller installed in the control unit with the computer program and power supply 4 performs self-diagnosis of the Device and analysis of input parameters based on indicators from sensors 19 (RT 1), 20 (RT 2), 21 (TEi), 22 ( TEC), - data is transmitted to the operator's workstation 6, located in the centralized control center of UKPG-3 via SMS transmitted wirelessly.

Next, controller 4, based on the received data from 19 (RT 1), 20 (RT 2), 21 (TEi), 22 (TEc), automatically calculates, using a computer program, the opening and holding time of valve 12 for dosing a given portion of the inhibitor through the throttle 18 and transmits data on consumption to the workstation of operator 6, located in the centralized control center of UKPG-3 via SMS transmitted wirelessly.

With a current change in any of the indicators 19 (RT 1), 20 (RT 2), 21 (TEi), 22 (TEc), the controller, through a computer program, automatically adjusts the opening time of valve 12 either up or down to reduce or increasing the amount of inhibitor supplied by adjusting the dosage and flow rate.

If the opening time of valve 12 increases beyond the cycle duration values specified by the computer program algorithm, a message is sent to the operator's workstation 6 - “the valve opening time is greater than the cycle time.”

If an emergency situation occurs, for example, the controller determines the maximum pressure deviation ΔPT1 (0.2 kg/cm2) before (PT1.1) and after (PT1.2) opening valve 12, a message is sent to the operator's workstation 6 - “filter replacement required” .

If an emergency situation occurs, for example, the controller detects a lack of power at valve 12 (PCV 01), a message is sent to the operator's workstation 6 - “valve replacement required”, in this case the operator at the well closes valves 13 and 15.

Transferring the Device to another range by replacing the throttle is carried out according to the same scheme as when replacing a valve.

The declared technical solution increases the reliability and trouble-free operation of the Device, providing controlled dosing and consumption of the inhibitor, with a simple design, while ensuring increased reliability of the well stock, ensuring the most accurate consumption of the inhibitor due to the compactness of the Device, built on the principle of local automation, and a program developed by specialists for a computer, where in automatic mode, in real time, an electromagnetic remote-controlled valve is controlled, regulating the dosage and flow rate of the inhibitor, providing a given flow rate of the inhibitor based on the readings of pressure sensors PT1, PT2 and temperature sensors TEi, Tec (not only methanol pressure , but also based on the temperature of methanol and soil, the open time of the valve and the number of openings are set - the range of inhibitor supply when using one standard size of the throttle is from 0.1 to 4.0 l/h, the actual error is up to 3%), the absence of a mechanical unit complex technical devices, for example, a throttle package, the use of a throttle installed separately from the valve in the device makes it possible to quickly replace the throttle with another, including with other parameters, without dismantling the valve and disassembling it; use any solenoid two-way valve. Implementation of autonomous power supply, automatic process control with display of information on the operator's workstation.

The device is designed for operation at ambient temperatures down to minus 45°C without the use of heating, since the equipment used corresponds to the climatic version UHL1, and operating pressure up to 10.0 MPa.

Claims (4)

1. A device for dosing a corrosion and hydrate formation inhibitor, containing a pipeline system with shut-off, shut-off-regulating and control equipment, hermetically connected to each other, a power and control unit with a program for an electronic computer, wireless communication equipment, characterized in that the device is additionally equipped with a filter, the said pipeline system includes: the main inhibitor supply pipeline from the gas treatment plant pump, the inlet pipeline, the main pipeline, the bypass pipeline, the outlet pipeline and the main inhibitor supply pipeline to the well, while the main inhibitor supply pipeline from the installation pump gas preparation on one side is hermetically connected to the pump of the gas treatment installation, and on the other hand is hermetically connected to the inlet pipeline equipped with a ball valve; the inlet pipeline on the other hand is hermetically connected to the main pipeline by means of a filter located on the main pipeline, also equipped with an electromagnetic remote control controlled by a valve, throttle, check valve and control and measuring equipment - pressure sensors and hermetically connected on the other side to the outlet pipeline equipped with a ball valve, the outlet pipeline on the other side is hermetically connected to the main pipeline for supplying the inhibitor to the well, the bypass pipeline is equipped with a ball valve and is hermetically connected on one side to the main pipeline in front of the electromagnetic remote-controlled valve, and on the other hand is hermetically connected to the main pipeline after the throttle, installed separately from the electromagnetic remote-controlled valve with the possibility of replacement; the device is also additionally equipped with external instrumentation representing are sensors for the temperature of the corrosion inhibitor and hydrate formation and the temperature in the well, located in the range of wireless communication between the power supply and control unit and the computer program, which exercises real-time control of the electromagnetic remotely controlled valve, regulating the dosage and flow rate of the corrosion inhibitor and hydrate formation according to indicators pressure and temperature indicators of the corrosion inhibitor and hydrate formation and temperature in the well, received from the specified pressure and temperature sensors, and self-diagnosis with the ability to monitor filter contamination, the performance of the electromagnetic remotely controlled valve, and reconfigure the power and control unit. 2. The device according to claim 1, characterized in that the power and control unit with the computer program contains non-volatile power. 3. The device according to claim 1, characterized in that the computer program for the power supply and control unit ensures autonomous operation. 4. The device according to claim 1, characterized in that the computer program for the power supply and control unit transmits data to the operator’s automated workstation via wireless communication via SMS messages.