RU2272996C1 - Immersible telemetry device - Google Patents

Abstract

FIELD: engineering of remote measuring equipment, in particular, for controlling status of electric down-pumps.

SUBSTANCE: to achieve technical result pressure indicator and temperature indicator are made in form of three-poles to second output of semiconductor diode an input of current splitter is connected, first output of which is connected to input of power source, connected by first output to first input of commutator power.

EFFECT: improved measuring speed and expanded range of possible application.

4 cl, 2 dwg

Description

The invention relates to measuring equipment and can be used in diagnostic systems of submersible electric pumps used for oil production.

A device is known for immersion telemetry, which is part of the SKAD-2I thermomanometric system manufactured by the SCAD-Oil Scientific and Implementation Enterprise [Thermomanometric SKAD-2I system. Technical description and operating instructions DMF 1.000.004 TO, 1998, Equipment for oil and gas production. V.N. Ivanovsky, V.I. Darishchev et al. - M.: Russian State University of Oil and Gas named after Gubkina, 2002, S. 535-540]. The immersion telemetry device comprises a pressure sensor, a temperature sensor, a capacitor, an inductor, a power transformer, a rectifier, a voltage regulator, an output power amplifier, pressure and temperature converters, comprising a voltage-frequency converter, a scaling amplifier and an output frequency divider.

The lack of accuracy in the measurement of immersion telemetry devices is due to the use of active elements (transistors and microcircuits), the parameters of which largely depend on the ambient temperature. The circuit implementation of the device does not allow to compensate for the dependence of the measurement results on temperature. In addition, the power of the submersible telemetry device is provided by desoldering the motor winding and when the motor is off, the device is not operational.

The closest technical solution is a thermomanometric sensor [Patent 29999 RU, IPC G 01 D 3/00, priority dated 12/16/02] The thermomanometric sensor contains an LC filter consisting of a capacitor and a throttle, a pressure sensor including a pressure transmitter, a sensor temperature, a semiconductor diode, an electromagnetic relay and a threshold element, a varistor, the first output of which is connected to the first output of the inductor, and the second output to the common wire, and the windings of the inductor and electromagnetic relay are dates IR temperature.

The disadvantage of the thermomanometric sensor is the lack of measurement accuracy due to the influence of temperature instability of the following elements: diode, inductor, electromagnetic relay and communication line connected in series to the sensor input. In addition, the number of measured parameters (two) is limited.

The technical result obtained by carrying out the invention is expressed in improving the accuracy of measurement and expanding functionality.

The specified technical result is achieved in that in an immersion telemetry device containing an LC filter, a semiconductor diode, a pressure sensor, a temperature sensor, the LC filter choke being connected to the input of the device by the first output and a pressure sensor to the first output of the semiconductor diode, and the temperature sensor is made in the form of three-terminal, the input of the current divider is connected to the second output of the semiconductor diode, the first output of which is connected to the input of the power source, the first output connected to the first power input of the switch, the second output to the common wire and to the second power input of the switch, the third output to the first output of each sensor and to the first analog input of the switch, the fourth output to the second output of each sensor and to the second analog input of the switch, third conclusions the pressure sensor and the temperature sensor are connected to the third and fourth analog inputs of the switch, respectively, the output of the switch is connected to the first output of the resistor connected to the second output by a second output th divider.

In an immersion telemetry device, the LC filter can be multi-link.

A submersible telemetry device may comprise a varistor, the first terminal of which is connected to the second terminal of the choke of the first link of the LC filter, and the second terminal is connected to the common wire.

A submersible telemetry device may contain N sensors connected by the first leads to the third output of the power source and to the first analog input of the switch, the second leads to the second output of the power source and to the second analog input of the switch, the third conclusions of N sensors are connected to the corresponding N analog inputs of the switch, where N> 2.

A submersible telemetry device is an integral part of a telemetry system, which also contains a terrestrial telemetry unit (measuring and recording device). The immersion telemetry device is connected to the measuring and recording device through the veins of the immersion cable and is connected to the common point of the stator winding of the submersible motor connected to the star.

The immersion telemetry device is a two-terminal device and is connected by the first output (input-output) to the common point of the stator winding of the submersible electric motor, and the second output (common wire) to the grounded armor of the immersion cable.

The proposed device immersion telemetry provides a signal from any of the N sensors, for example, from a pressure sensor, the value of which is determined from the ratio:

where U ₁ = U _op1 is the voltage at the first output of the sensor, equal to the reference voltage U _op1 at the third output of the power source;

U ₂ = U _op2 - voltage at the second output of the sensor, equal to the reference voltage U _op2 at the fourth output of the power source;

U ₃ - voltage at the third output of the sensor;

P is the current pressure value;

P _max - the maximum pressure value measured by the pressure sensor.

With successive operation of the switch, each of the N sensors having voltage at the terminals is connected to the output (input) of the immersion telemetry device: at the first output of the sensor U ₁ , at the second output of the sensor U ₂ and at the third output of the sensor U ₃ , while at the input of the device Submersible telemetry voltage is formed:

where U ₁ , U ₂ , U ₃ - voltage at the first, second and third terminals of the sensor, respectively;

ΔU is the voltage drop that does not change during the measurement, depending on the temperature (variable error), on circuit elements connected in series with the sensor: switch, resistor, current divider, diode, LC filter chokes, cores of a submersible cable.

Voltages (2) are measured by a measuring and recording device and converted into the following ratio:

As can be seen from relation (3), the result of measuring the signal from any of the N sensors is independent of temperature.

Thus, providing the possibility of connecting with the switch to the output of the voltage from the outputs of the sensors, as well as the reference voltage of the voltage source, eliminates the dependence of the measurement results on both temperature and reference voltages, and thereby improve the accuracy of measurement.

The expansion of the functionality of the device is achieved by providing the ability to measure any number of (N) parameters by connecting any (N) number of sensors. The number of connected sensors is limited only by the time of polling the sensors and the permissible current at the input of the device.

Figure 1 shows a diagram of an electrical device for immersion telemetry.

Figure 2 shows the timing diagram of the voltages at the output (input) of the submersible telemetry device.

The immersion telemetry device contains (see Fig. 1) a two-link L-shaped LC filter 1, the first link of which consists of a throttle 2 and a capacitor 3, and the second - of a throttle 4 and a capacitor 5. The throttle 2 is connected to the input (output) by the first output ) of the device, by the second terminal, to the first terminal of the inductor 4 and to the first terminal of the varistor 6 connected by the second terminal to the common wire. The second inductor 4 is connected to the first output of the semiconductor diode 7, the second output of which is connected to the input of the current divider 8. The first output of the current divider 8 is connected to the input of the power supply 9, the first output of which is connected to the first power input of the switch 10 "Power input 1" , the second output - with a common wire and with a second power input of the switch 10 "Power input 2". The third output of the power source 9 is connected to the first terminals of the pressure sensor 11, the temperature sensor 12 and to the analog input "N + 1" of the switch 10, the fourth output is connected to the second terminals of the sensors 11, 12 and to the analog input "N + 2" of the switch 10. The pressure sensor 11 and the temperature sensor 12 are made in the form of three-terminal devices. The third terminals of the pressure sensor 11 and the temperature sensor 12 are connected to the analog inputs "1" and "2" of the switch 10, respectively, the output of which is connected to the first output of the resistor 13, connected by the second output to the second output of the current divider 8.

The device may contain more than two sensors, for example N, connected by the first leads to the third output of the power source and to the analog input "N + 1" of the switch 10, by the second leads to the fourth output of the power source and to the analog input "N + 2" of the switch 10, the third conclusions of N sensors are connected to the corresponding analog inputs of the switch 10, where N> 2. The Nth sensor 14 by the third output is connected to the analog input "N" of the switch 10. The input "N + 3" of the switch 10 is connected to a common wire.

The switch 10 is an analog multiplexer and contains a generator 15, a counter 16, an analog multi-channel switch 17, an amplifier 18. The switch 10 can be performed either on discrete elements or on the basis of any known integrated circuits. The power of all elements of the switch 10 is carried out from the "Input pit 1" and "Input pit 2" connected to the outputs 1 and 2 of the power source 9, respectively.

The pressure sensor 11 contains a resistive transducer 19. The temperature sensor 12 is a resistive divider formed by a thermosensitive resistor 20 and a resistor 21. The N-th sensor (temperature sensor 14) is also a resistive divider containing a thermosensitive resistor 22 and a resistor 23. Midpoint resistive transducer 19 of the pressure sensor 11 and the midpoints of the dividers of the temperature sensor 12 and temperature sensor 14 are the third conclusions of the sensors. The number of sensors can be any from 1 to N.

The two-link LC filter 1 and varistor 6 are designed to protect the device from overvoltages arising from a single-phase short circuit of the stator winding to the motor housing, as well as when testing a submersible motor and a submersible cable with a megger. The semiconductor diode 7 is designed to supply only a positive polarity current to the device. A current divider 8 divides the input current into a current flowing through a power source 9 and a current flowing through a resistor 13. The voltage at the output (input) of the immersion telemetry device depends on the voltage applied to the first output of the resistor 13 associated with the output of the switch 10. The power source 9 is designed to generate the supply voltages U _pit1 and U _{pit2 of the} switch 10 and the reference voltages U _op1 and U _op2 to power the sensors 11, 12 and 14. The switch 10 is designed for sequential (in time) connection of the third output of each and h sensors 11, 12, 14, conclusions 3 and 4 of the power source 9 to the input of the device, as well as to generate a clock (U _p ) by connecting the input of the device through the analog input N + 3 of the switch 10 to the common wire. As a pressure sensor, any commercially available pressure sensor having a pressure transmitter in the form of a variable resistor can be used. Thermometers can be used as temperature sensors.

The measuring and recording device generates a current of positive (for measuring the parameters of the sensors of the submersible telemetry device) or negative polarity (for measuring the insulation resistance of the stator winding of the submersible motor).

During time t _{and 1} -t _{and 2} (figure 2), a stabilized current I _о is generated by the measuring and recording device, flowing through the cores of the immersion cable and through the immersion telemetry device to the common wire, while a positive polarity voltage is generated at the input of the measuring and recording device, the amplitude of which depends on the voltage at the third output of the sensor currently connected to the output of the switch.

A stabilized current of positive polarity flows through the circuit: immersion cable - inductors 2 and 4 of the LC filter 1 - semiconductor diode 7 - input and second output of the current divider 8 - resistor 13 - output of the switch 10 - common wire.

During the time t ₀ -t _{1, the} voltage from the third output of the pressure sensor 11 is supplied to the first analog input of the analog multichannel switch 17 and through it to the input of the amplifier 18, the output of which is the output of the switch 10 connected to the first output of the resistor 13. At the input of the measurement device and registration creates a voltage drop U ₁ proportional to the measured pressure, for example, inside the cavity of a submersible electric motor.

During the time t ₁ -t _{2, the} analog multichannel switch 17 switches the voltage from the third output of the temperature sensor 12 to the input of the amplifier 18, by the output of the resistor 13 connected to the first output. At the input of the measuring and recording device, a voltage drop U ₂ proportional to the temperature measured by the sensor 12 is created .

Similarly, over time t _n-1 -t _{n, the} analog multi-channel switch 17 switches the voltage from the third output of the Nth temperature sensor 14 to the input of the amplifier 18, by the output of the resistor 13 connected to the first output. A voltage drop U _n is created at the input of the measurement and recording device proportional to the temperature measured by the sensor 14.

During the time t _n -t _{n + 1, the} analog multichannel switch 17 switches the voltage from the third output of the power source 9 to the input of the amplifier 18, by the output of the resistor 13 connected to the first output. A voltage drop is created at the input of the measuring and recording device, proportional to the reference voltage U _op1 power supply 9.

During the time t _{n + 1} -t _{n + 2, the} analog multi-channel switch 17 switches the voltage from the fourth output of the power source 9 to the input of the amplifier 18, by the output of the resistor 13 connected to the first output. A voltage drop proportional to the reference voltage is created at the input of the measuring and recording device U _op2 power supply 9.

During the time t _{n + 2} -t _{n + 3, the} analog multichannel switch 17 commutes a common wire to the input of the amplifier 18, by the output of the resistor 13 connected to the first output. A voltage drop is created at the input of the measuring and recording device, which is the strobe voltage U _p .

Thus, at the output (input) of the immersion telemetry device, voltages are formed sequentially in time, proportional to the current values of the parameters measured by the sensors (pressure, temperature), and reference voltages U _op1 and U _op2 .

When the device immersion telemetry is achieved, the ability to function both when the submersible motor is turned on and off.

The claimed technical solution of the device submersible telemetry can be made in mass production using standard equipment and technologies.

The immersion telemetry device allows to increase the measurement accuracy by eliminating the temperature dependence of the parameters of the device elements and expand the functionality by increasing the number and range of connected sensors.

Claims (4)

1. A submersible telemetry device containing an LC filter, a semiconductor diode, a pressure sensor, a temperature sensor, the LC filter choke being connected to the input of the device with a first output and a second output to a semiconductor diode first, characterized in that the pressure sensor and the temperature sensor are made in the form of triples, the input of the current divider is connected to the second output of the semiconductor diode, the first output of which is connected to the input of the power source, the first output connected to the first power input of the switch RA, the second output to the common wire and to the second input of the switch’s power supply, the third output to the first output of each sensor and to the first analog input of the switch, the fourth output to the second output of each sensor and to the second analog input of the switch, the third conclusions of the pressure sensor and the temperature sensor is connected to the third and fourth analog inputs of the switch, respectively, the output of the switch is connected to the first output of the resistor connected by the second output to the second output of the current divider. 2. The submersible telemetry device according to claim 1, characterized in that the LC filter is multi-link. 3. The submersible telemetry device according to claim 2, characterized in that it contains a varistor, the first output of which is connected to the second output of the throttle of the first link of the LC filter, and the second output to the common wire. 4. The submersible telemetry device according to claim 1, characterized in that it contains N sensors connected by the first leads to the third output of the power source and to the first analog input of the switch, the second leads to the second output of the power source and to the second analog input of the switch, third the conclusions of N sensors are connected to the corresponding N analog inputs of the switch, with N> 2.

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