RU2612003C1 - Plant for calibration and verification of oil and oil products moisture meters - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: plant includes a closed calibration fluid circulation loop containing a mixing section, a calibration fluid flow meter, a liquid flow rate control system using a pump with frequency regulation, a thermal control system, docking units for installation of verification and control moisture meters. The closed calibration fluid circulation loop is designed closed at a controlled internal pressure. At the mixing section, the calibration fluid circulation loop is connected with two systems dispensing calibration liquid components - with tanks. The calibration fluid circulation loop is connected to the systen of dosed calibration fluid discharge; the thermal control system includes an external chiller with a heat exchanger, providing calibration fluid cooling and heating to a predetermined temperature. The plant is equipped with an automated control system with an operator automated workstation with power control and process automation equipment.

EFFECT: invention allows to increase labour productivity during the studies, obtain the required measurement results in significantly shorter periods of time, to improve the reliability of the regulated measurement conditions, to reduce the human factor influence.

3 cl, 2 dwg

Description

FIELD OF THE INVENTION

The invention relates to oil and gas testing equipment and can be used for calibration and calibration of flow moisture meters of oil and oil products in an automated mode, as well as for testing instruments for measuring the moisture content of oil and oil products using reference calibration liquids (mixtures) with specified values of volumetric (mass) content water and mineral salts in oil and petroleum products. The invention can also be used to verify the moisture content of other hydrocarbon liquids.

State of the art

For devices of this purpose, the current level of technology involves the presence of the following elements:

- the presence of a closed circulation loop, which provides the ability to test the means of measuring the moisture content of mixtures with hydrocarbon liquids of a given concentration during a continuous process of the required duration;

- the use of modern high-precision measuring instruments, while ensuring the necessary repeatability of the results;

- the ability to control the flow of calibration mixture and test conditions;

- a high degree of automation of the processes of preparing mixtures and testing, ensuring a decrease in the influence of the human factor and increase productivity.

The known installation for checking moisture meters of oil and oil products (see [1] patent RU 36893, G01N 33/22. G01N 33/26, publ. 03/27/2004) contains a closed circulation circuit, a storage tank (mixer tank) connected in series to the pipeline, which circulates a test fluid with predetermined parameters, with a device for eliminating flow turbulence, a temperature control system with a temperature sensor, a device for adjusting the flow rate associated with a pump for mixing oil and added water, docking units for mounting Ia primary device under test meter. This installation provides the ability to conduct continuous tests of the required duration; the ability to control the flow of the calibration mixture (manually, using frequency regulation of rotation of the pump rotor), the ability to control the temperature of the calibration mixture.

The disadvantages of this analogue are the lack of solutions providing the possibility of using means of automation of processes, as a result of which there is a high dependence of the results of tests and studies on the influence of the human factor; lack of strictly automatic technical means of high-precision dosing of components in the preparation of calibration mixtures; lack of means to control flow parameters; imperfection of the temperature control system.

The closest analogue in terms of essential features is the installation for checking moisture meters of oil and oil products (see [2] patent RU 92962, G01N 33/22, C01N 33/26, publ. 10.04.2010), containing a circulation circuit connected in series to the storage tank in which the test fluid circulates with predetermined parameters, with a device for eliminating turbulence in the fluid flow, a device for adjusting the emulsion flow rate associated with the pump motor, a temperature control system with a temperature sensor bangs and docking assemblies for mounting the primary transducer of the hygrometer, a static mixer installed at the inlet of the calibrated hygrometer, a flow meter used to control the flow rate of the calibration fluid, the optimum value of which is carried out by a device for adjusting the flow rate of the emulsion, made in the form of a frequency controller for the pump motor power and the temperature control system contains a thermostat with a cooling system made on Peltier thermocouples, and an electronic thermostat gulyator associated with a temperature sensor.

The disadvantages of the prototype are:

- the presence of a single storage tank in which the components are dosed manually, and for studies on a mixture of a different concentration, it is necessary to stop the circulation process and re-mix the components;

- the use of a temperature control system on Peltier elements with one heat exchanger having a limitation on cooling power;

- lack of an automated control system that allows dosing of water (oil) in automatic mode, as well as setting the required parameters of the installation using the keyboard of a personal computer, controlling the measurement process, recording data, processing and transmitting information.

SUMMARY OF THE INVENTION

The problem that is solved by the claimed invention is the creation of high-speed (highly efficient) equipment for checking and calibrating measuring instruments for quality indicators of oil and oil products (in this case, their moisture content) that meets modern metrological requirements in force in the oil and gas industry and provides the possibility of its adaptation in the composition modern information transfer and control systems.

When implementing and implementing the present invention, obtaining measurement results is achieved:

- meeting modern metrological requirements;

- minimally influenced by the human factor;

- in forms acceptable for processing and transmission using modern information systems.

The technical result is an increase in labor productivity during research, obtaining the required measurement results in significantly shorter time intervals, increasing the reliability of the regulated measurement conditions, reducing the influence of the human factor.

The technical result is achieved due to the fact that the installation for calibrating and checking moisture meters of oil and oil products includes a closed circulation loop of the test fluid containing a mixing section, a flow meter of a test fluid, a system for controlling the flow rate of a fluid using a pump with frequency regulation, a temperature control system, docking units for installation of calibration and control moisture meters, while the closed circulation circuit of the calibration fluid is closed when controlled internal pressure, in this case, two dosed supply systems of calibration fluid components are connected to the circulation circuit of the calibration fluid, at the mixing section, with containers, while the dosed calibration fluid is connected to the circulation circuit of the calibration fluid, an external chiller with a heat exchanger is included in the temperature control system, providing both cooling and heating of the test fluid to a predetermined temperature, while the installation is equipped with an automated control system Nia with workstation operator with power equipment management and process automation.

In order to ensure a metered adjustment of the ratio of the components of the test fluid and control of this process, both systems of the metered supply of the components of the test fluid include precision fluid mass meters, also, the systems of the metered supply of components and the metered discharge of the test fluid include quick-acting controlled valves, in addition, the system of the metered discharge of the test fluid equipped with electronic platform scales to control the mass of the drained liquid. In order to provide the ability to control the pressure of the test fluid in a closed circulation circuit, a pressure injection unit is connected to it.

Brief Description of the Drawings

FIG. 1 is a schematic diagram of an apparatus for calibrating and checking moisture meters of oil and oil products.

FIG. 2 - general view of the installation.

In the figures, the numbers indicate the following positions:

1 - circulation circuit; 2 - mixing section; 3 - connection node verifiable moisture meter; 4 - flexible compensation insert; 5 - connection point of the control moisture meter; 6 - flow meter of a test fluid; 7 - pressure injection unit; 8 - pump; 9 - a container for water; 10 - capacity for oil; 11 - dosing pump for water, 12 - dosing pump for oil; 13 - mass meter, 14 - mass meter; 15 - remote-controlled (solenoidal) valve; 16 - remotely controlled (solenoidal) valve; 17 - measured capacity; 18 - electronic scales; 19 - remotely controlled (solenoidal) valve; 20 - temperature control system; 21 - external chiller; 22 - heat exchanger; 23 - heat exchanger; 24 - workstation; 25 - measuring and computing complex; 26 - power control cabinet; 27 - control controller; 28 - block frequency regulation; 29 - air bleed valve (air vent).

Disclosure of invention

In FIG. 1 is an installation diagram illustrating the essence of the invention. The main part of the installation is a closed circulation circuit (1) containing a mixing section (2), a connection unit for the moisture meter to be tested (3) with a flexible compensation insert (4) at the outlet, a connection point for the control moisture meter (5), a calibration liquid flow meter (6), pressure injection unit (7), pump (8), means of measuring fluid flow parameters (sensors, temperature and pressure), shut-off valves, which provide, in particular, drainage of liquid into the drain when emptying the circulation circuit (1). The relative placement of these elements in the circulation circuit is dictated by structural and operational considerations - ease of installation, operational availability, maintainability, etc. In order to ensure continuous circulation of the test fluid through a closed circulation circuit with a controlled pressure in it - the circuit is closed.

To the mixing section (2) of the circulation circuit (1) are connected two separate systems for the dosed supply of components of the test fluid (identical in design). Each system contains the containers of components (9) and (10) (water and oil, respectively), metering gear pumps (11) and (12), precision mass meters (13) and (14), remote-controlled valves (15) and (16).

The system for dispensing a test fluid consists of a measuring tank (17), electronic platform scales (18) and a remote-controlled valve (19).

The systems for the dosed supply of components and the system for dosed discharge of the test fluid in combination with an automated control system provide the possibility of controlled formation with high accuracy of the specified ratio of components in the test mixture - in accordance with the ratio scale assigned for this study.

The temperature control system (20) includes an external chiller (21) (such as a universal water-cooling installation with a heating function), heat exchangers (22) and (23), connecting pipelines with remote-controlled valves.

An automated control system includes an automated workstation (AWS) (24), a measuring and computing complex (25), and a power control cabinet (26) containing a control controller (27) and a frequency control unit (BCH) (28).

The automated control system is equipped with software according to its functions: calculating the required masses of components; automatic or manual data entry on the operating modes of the installation; dosed filling of the circulation circuit and adjusting the ratio of the components during the test by dosing the test fluid and introducing into the circulation circuit a calculated dose of one of the components of the test fluid; continuous monitoring of test fluid circulation processes; fixing and recording the readings of measuring instruments with wide limits of changes in periods and the total duration of the recording of readings; primary processing of test results and the formation of calibration and calibration protocols for moisture meters; information transfer to integrated control systems.

In FIG. Figure 2 shows the general view of the installation, here it is shown: a pump (8), tanks for initial products - for water (9), for oil (10), a measuring tank for draining the sample (17) mounted on the scales (18), a chiller (21 ), air bleed valve (air vent) (29).

Installation for calibration and calibration of moisture meters of oil and oil products operates as follows.

Based on the type and purpose of the test, set the scale of the ratio of the components, which is subsequently implemented in stages in the process of testing. As a verification fluid during calibration and calibration of moisture meters, oil (or oil product) and water are usually used as components of a moisture-containing mixture. In this case, the salinity of the liquid is also a normalized indicator. In research trials, a different hydrocarbon liquid may be used instead of oil.

The initial data on the ratio of components through the AWP (24) is entered into the CPI (25). Using the CPI, according to a given algorithm, the masses of components that need to be added (reduced) in the circuit are calculated in order to obtain the specified moisture content of the test fluid (in accordance with a given ratio scale).

Refuel the components of the test fluid in the tank (9) and (10).

Component supply systems using pumps (11) and (12), precision mass meters (13) and (14), remotely controlled valves (15) and (16) inject specified (primary) doses of components into the circulation circuit (1) through its mixing section (as a rule, during the initial filling, only one of the components is pumped into the circulation circuit - either water or oil product (or hydrocarbon liquid) .In this case, the air is forced out through air vents (air bleed valves) (29) located at the upper points of the installation pipeline system .

IVK through a digital communication channel gives a signal to the control controller to the beginning of the dosing cycle. The control controller, in turn, through the control circuit provides signals to open the corresponding solenoid valves, a signal to start the pump and a signal to open the solenoid valve (19). The mass of the introduced component is controlled by the readings of mass flow converters (14, 15). Upon reaching the specified mass, the control controller gives a signal to close the high-speed solenoid valves (15, 16, 19). According to the testimony of scales (18), mass flow converters and a temperature sensor in the IVK, the volume and moisture content of the test fluid in the circuit are calculated. After the operator confirms the start of the test procedure on the AWP (24), the control controller (27) sends a signal to the BCH (28) to start the pump (8). The volume flow in the calibration circuit can be set by the operator both from the AWP display (24) and from the BCHR panel (28) in the control cabinet. During the test, the readings of the measuring instruments: pressure sensor, temperature sensor, turbine flow transducer, control moisture meter - are recorded in the IVK, and on the instructions of the operator can be included in the test report. If during the test the temperature of the test fluid in the circuit has changed beyond the permissible value, the control controller sends a signal to open (close) the solenoid valves of the temperature control system, as a result of which the coolant is switched on or off through heat exchangers 22 and 23.

Each test stage, characterized by the ratio of components and the temperature of the test fluid, consists in pumping a two-component mixture along the circulation circuit with the control and adjustment of the test moisture meter readings according to a given ratio of components corresponding to the moisture content of the mixture, which was realized when dosing the components of the test fluid. The control hydrometer (5) serves to assess the quality of the mixture circulating along the circuit and the operability of the installation as a whole. Changing and maintaining temperature conditions is provided by the temperature control system (20). Changing the ratio of components is carried out according to a predetermined program by pouring a given dose of the mixture into the container (17) (by opening the valve (19) according to the readings of the weights (18) with a parallel input into the circulation circuit (1) of the calculated dose from one of the two dosed component delivery systems.

In addition, thanks to this invention, in the process and according to the results of tests, remote monitoring and process control, processing and recording of results, information transfer to integrated control systems are carried out.

Claims (3)

1. Installation for calibrating and calibrating hydrometers of oil and oil products, including a closed circulation loop of the test fluid, comprising a mixing section, a flow meter of a test fluid, a system for controlling the flow rate of a fluid using a frequency-controlled pump, a temperature control system, docking assemblies for mounting a test and control moisture meter characterized in that the closed circulation circuit of the test fluid is closed at a controlled internal pressure, while the calibration fluid circuit, at its mixing section two systems of metered supply of calibration fluid components are connected - with tanks, while the calibration fluid calibration system is connected to the calibration fluid circuit, an external chiller with a heat exchanger is included in the temperature control system, providing both cooling and heating the test fluid to a predetermined temperature, while the installation is equipped with an automated control system with an automated working estom operator with power equipment management and process automation. 2. The apparatus according to claim 1, characterized in that in order to ensure a metered adjustment of the ratio of the components of the test fluid and control this process, both systems of dosed supply of the components of the test fluid include precision fluid mass meters, and high-speed components are included in the systems of dosed supply of components and dosed discharge of the test fluid controlled valves, in addition, the metering system for dispensing calibration fluid is equipped with electronic platform scales to control the mass of the drained fluid STI. 3. Installation according to claim 1, characterized in that in order to provide the possibility of regulating the pressure of the test liquid in a closed circulation circuit, a pressure injection unit is connected to it.

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