SU1652525A1 - Controller for submersible motor temperature and pump intake pressure - Google Patents

Abstract

The invention relates to the oil industry. The purpose of the invention is to enhance functionality and increase reliability. The device contains a temperature measuring transducer (P) 15, a power supply unit 8, a pulse generator 14, elements (E) I 20 I 21, ZIL I 22, a submersible electric motor 1 connected by cable 2 to a power transformer (T) 3 feeding T 30, E 38 - 41, pulse generator 35, trigger 37, indication block 52, To achieve the goal, the device has a block 23 of generating time

Description

The invention relates to the oil industry, in particular, to devices for monitoring technological parameters in a well and protecting a submersible electric motor from abnormal conditions.

The aim of the invention is to enhance the functionality and increase the reliability of the control.

Figure 1 shows the structural diagram of the proposed device; Fig. 2 is a block diagram of the regulation.

The device contains a submersible electric motor (PED) 1. power cable 2, power transformer 3, first coupling capacitor 4, second coupling capacitor 5, first coupling transformer 6, choke 7, power supply unit 8 containing rectifier 9, capacitors 10 and 11 and stabilizer 12, power amplifier 13, first pulse generator 14, temperature and pressure transducers 15 and 16, first and second voltage-to-frequency converters 18 and 19, first second elements AND 20 and 21, element OR 22, formation unit 23 are temporary x intervals, containing a pulse counter 24, a decoder 25, and OR elements 26 and 27. a third coupling capacitor 28, a fourth coupling capacitor 29, a supply transformer 30, a second separation transformer 31. a band-pass filter 32. a threshold element 33. The device has a pulse converter 34 in square impulses, second

pulse generator 35, frequency divider 36, trigger 37 elements 38 and 41. shapers 42 and 43 pulses, counters 44 and 45 pulses, registers 46 and 47, digital-to-analog converters (D / A converters) 48 and 49, large-scale amplifiers 50 and 51, block 52 display, adjustment unit 53.

The control unit 53 contains setting potentiometers 54-57, comparators 58-61, triggers 62, 63, element 64 OR, power amplifier 65, actuator 66, threshold element 67, resistor 68, capacitor 69. Tires 70,71 denote control inputs .

Power transformer 3 through power cable 2 is connected to the windings of the submersible electric motor 1, the zero point of which is connected to capacitor 4, the second terminal of which is connected to capacitor 5 and to choke 7. The second terminal of capacitor 5 is connected to the secondary winding of transformer 6, the second terminal of which is connected to bus Earth, and the primary winding of the transformer 6 is connected to the output of the amplifier 13 power. The outputs of the measuring transducers 15 and 16 are connected to the inputs of the voltage-frequency converters 18 and 19, the outputs of which are connected to the inputs of the elements And

20 and 21, the second inputs of which are connected to the outputs of the time slot formation unit 23. The outputs of the elements 20 and 21 are connected to the inputs of the element OR 22, the output of which is connected to the input of the amplifier 13. The second output of the throttle 7 is connected to the input of the rectifier 9. The output of which is connected to the capacitor 10 and the voltage regulator 12, the output of which is connected to the capacitor 11 The output of the pulse generator 14 is connected to the input of the time interval formation unit 23, which is the input of the counter 24. The outputs of the counter 24 are connected to the inputs of the decoder 25. The first two outputs of the decoder 25 are connected to the inputs of the OR 26 element. Fourth, fifth, above The stand and the seventh outputs of the decoder 25 are connected to the inputs of the element OR 27. The output of the elements OR 25 and 27 are the outputs of the time interval shaping unit 23.

The zero point of the secondary winding of the power transformer 3 is connected via capacitor 28 to the secondary winding of transformer 30 and further, through capacitor 29, separation transformer 31, band-pass filter 32 to the input of threshold element 33. The output of threshold element 33 is connected to the input of the third element 38 and the first the converter input 34 of bursts of pulses into square pulses, the second input of which is connected to the output of frequency divider 36, and the output is connected to the inputs of the formers 42 and 43 and the input of the fourth element AND 39 Output generator and 35 is connected to the input of a frequency divider 36, the second output of which is connected to the second input of the fourth element AND 39. The output of the first driver 42 is connected to the installation inputs of counters 44 and 45 and the input of the trigger 37, the output of which is connected to the second input of the third element And 38. element 38 is connected to the counting input of the lane (th counter 44, the outputs of which are connected to the inputs of registers 46 and 47. The output of the fourth element 39 is connected to the counting input of the second counter 45, the first output of which is connected to the second input of the trigger 37 and the first input m the fifth element And 40. The second output of the second counter 45 is connected to the input of the sixth element And 41, the output of which is connected to the input of the second register 47, the output of the second shaper 43 is connected to the second inputs of the sixth and fifth elements And 41 and 40. The output of the element And 40 is connected to the input of register 46, the outputs of which are connected to the inputs of the first digital-to-analog converter 48) The outputs of the second register 47 are connected to the inputs of the second digital-to-analog converter 49, the output of which is connected to the block through a scale amplifier 51 52 of the display and the input of the control unit 53, the output of the first digital-to-analog converter 48 is connected via a large-scale

an amplifier 50 with second inputs of information block 52 and adjustment block 53.

The device works as follows.

5 Measuring transducers 15 and

16 converts the values of temperature and pressure to proportional values of the DC voltage supplied to the inputs of the converters 18 and 19 hp-frequency. At the output of the transducers 18 and 19, pulses are generated, arriving at the inputs of the AND elements 20 and 21. The pulse frequency is determined by the following expression:

five

FX - FO + K to UBX.

where - Fo is the initial frequency;

UBX is the input voltage of converters 18 and 19;

0 K - proportionality coefficient. At the second inputs of the elements And 20 and 21, gate signals from the outputs of the time interval forming unit 23 are supplied. The time interval formation unit 23 operates as follows.

Clock pulses (TI) from the output of the generator 14 are fed to the input of a three-bit counter 24 pulses. At the exits

In counter 0, a binary code is generated that is fed to the inputs of the decoder 25, which has eight outputs. With each arrival on the counter input 24 eight pulses at the inputs of the decoder 25

5 a logical unit appears sequentially. The time of each output of the decoder 25 in the state of a logical unit is equal to the repetition period of TI. The OR element 27 combines the fourth, fifth, sixth and seventh outputs of the decoder 25. Thus, the output of the OR element 26 logical unit there are two TI periods, then there is a pause in one TI period, then the logical unit appears at the output element OR 27 and there are four TI periods, then a pause during the eighth TI period and then everything repeats. Logical unit from the outputs of the elements OR 26 and 27 allowing

0, the passage of pulses Fx through the elements AND 20 and 21. During the first two TI periods, the FX pulses from the output of the converter 18 arrive through the element AND 20, the element OR 22 to the input of the power amplifier 13.

5 Then there is a pause and the pulses F do not pass to the input of the amplifier 13. Then for four periods of the TI the pulses Fx from the output of the converter 19 through the element 21. The OR element 22 enters the input of the amplifier 13 Then a pause is formed and a new information transmission cycle begins .

This provides a temporary separation of information that is transmitted on the same frequency range for different sensors. This allows you to select the optimal frequency range from the point of view of the signal passing through the communication line and the subsequent filtering path at the receiving point.

The ratio between the duration of the signal and the pause may be different in principle, but the ratio between the duration of the strobes from the outputs of elements 26 and 27 equal to 1: 2 is optimal from the point of view of the simplicity of determining the channel number when processing information at the receiving point.

The information signal is amplified by the power amplifier 13 and through the separation transformer 6, the separation capacitors 5 and 4, through the zero point of the EMP 1 enters the communication line (power cable 2). The information is removed through the zero point of the secondary winding of the power transformer 3 and further through the third and fourth separation capacitors 28 and 29 and the separation transformer 31.

The zero point can also be organized artificially with the help of three capacitors connected to the phases of the power cable and interconnected. This will eliminate the undesirable effect of the large inductance of the power transformer 3 on signal flow.

The supply voltage is removed from the secondary winding of the transformer 30 and through the third coupling capacitor 28, the zero point of the power transformer 3, the power cable 2, the zero point of the SEM 1, the first coupling capacitor 4, the choke 7, is fed to the rectifier 9 of the power supply unit 8. The second bus is the ground. The rectified voltage is supplied to the stabilizer 12 and further to the power supply of the downhole blocks.

The parameters of the power supply and information transmission circuits are selected from the following considerations. The frequency Px should be much greater than the industrial frequency of 50 Hz, for example, 500 times. The capacitance of the capacitor 28 must be much greater than the capacitance of the capacitor 29, since the supply voltage of 50 Hz must be significantly attenuated on the capacitor 29 and sufficiently freely pass through the capacitor 28. The primary resistance of the transformer-31 must be small for the frequency Fx. Similarly should

the ratio between the capacitors 4 and 5 should be. The choke 7 serves so that the information signal is not short-circuited through the power supply unit 8.

Isolation transformers 31 and 6 are galvanically isolated between power circuits and information processing circuits, and also weaken the effect of a 50 Hz supply voltage on

0 informational chains.

From the isolation transformer 31, the information signal through the band-pass filter 32 is supplied to the threshold element 33. At the output of the threshold element 33, bundles of rectangular pulses are generated with a tracking frequency Fx. Timing diagrams of the signals at the output of element 33 should repeat the picture of the signals at the output of the element OR 22.

0 The pulses Fx are fed to the converter input 34 bursts of pulses into square pulses. The second input of the converter 34 receives clock pulses from the output of the frequency divider 36,

5 input pulses of which are generator 35 pulses. At the output of converter 34, rectangular pulses are formed, which are envelopes for input bursts

0 with saving pauses between packs. At the beginning of each pulse envelope, shaper 42 generates a short pulse, which sets in initial states counters 44 and 45 and a trigger

5 37. The initial state of the counter 45 is zero. During the current batch of pulses to the input of the element And 39 receives the resolution and clock pulses from the second output of the divider 36 frequency is fed to

0 is the counting input of the counter 45. The initial state of the trigger 37 is single and the pulses Fx through the element 38 arrive at the counting input of the counter 44. The initial state of the counter 44 in general must be different from zero to subtract the initial value F0. For this, a pulse from the output of the imaging unit 42 is fed to the pre-recording input of the number (the setup input) and a parallel code (not shown) is recorded in the counter 44. The value of this code is chosen from the following considerations. In order for the Fx value to be much more than 50 Hz, you need to increase the Fo value, which you then need to subtract,

5 to get a large dynamic range of the output signal (for accuracy reasons).

Suppose that the time for converting a frequency to a code is T. then T Fx -T (F0 + Shwh} 1 n is the code value. To subtract F0, you need TF0 SN, where N is the number of counter states 44. Since this requirement is not always can be done, then an additional number No is recorded in the counter 44 and the expression will be TF0 + NO N, from which the value No. is calculated.

A sign greater than or equal to means that during the measurement time there should always be an overflow of the counter 44, even if the frequency Fx will be slightly lower than the frequency F0 (due to instability or sensor failure). If the F0 value is very large, then the counter 44 may overflow several times during the measurement time.

After a conversion time T at the first output of the counter 45, the potential reaches a single potential and the trigger 37 goes into the zero (prohibiting) state. Counter 44 now has generated a code proportional to the parameter being measured.

After the output pulse of converter 34 has terminated, an inhibitory potential appears at the input of element AND 39, and shaper 43 generates a short output pulse at the inputs of elements 40 and 41. In counter 45, a code is written that is proportional to the pulse duration from the output of converter 34 pulses from the output of the element 33). If the measured channel was the first (short), then the unit potential will remain at the first output of counter 45 and the pulse from the output of shaper 43 will go through input I of record 40 to register entry 46. As a result, counter code 44 will be overwritten into register 46. At output of the DAC 48 is Vits DC voltage proportional to the code or value of the measured parameter of the first channel.

If the measured channel was second (wide), then the single potential will move to the second output of counter 45 and the pulse from the output of the imaging unit 43 through element 41 will enter the input of the register entry 47. The counter code 44 will be written to register 47. At the output of the DAC 49 voltage proportional to the code or value of the second parameter.

The scale amplifiers 50 and 51 ensure that their output voltages match the values of the measured parameters of temperature and pressure. Next, the voltages are fed to the display unit 52 and the control unit 53. Display 52 is a voltmeter with a scale in named pressure units.

and temperatures and can be both digital; and arrow.

The control unit 53 operates as follows.

The voltage from the output of the scale amplifier 50 via the bus 70 is fed to the inputs of two comparators 58 and 59. To the other inputs of the comparators threshold voltages (setpoints) are received from potentiometers

0 54 and 55. One setting is called bottom, the other top. Similarly, the comparators 60 and 61 are connected to the output of amplifier 51 and potentiometers 56 and 57. With a decrease in pressure at the pump intake below

5 of the lower setpoint, the trigger 62 enters a single state, which through the element OR 64 and the amplifier 65 enters the actuator 66, for which an electromagnetic relay can be used. The relay operates and turns on the power supply of the submersible electric motor, but the power to the downhole blocks continues to flow.

Next, the pressure in the well begins

5 to grow due to the flow of oil and at some point in time will exceed the upper setpoint. Then the trigger 62 goes to the zero state and if the other input of the OR 64 element also has a zero state, then

0 the actuator 66 will include the PES 1 in the work. The temperature control algorithm will be reversed due to the fact that the signal from the flip-flop 63 is removed from its inverse output. Therefore, if the temperature of the 5-stage stator winding exceeds the upper setpoint, then the trigger 63 will go to the zero state, a logical unit will arrive at the input of the OR 54 element and the relay will switch off the SLE 1.

0Application of the proposed device

allows to increase the signal-to-noise ratio due to the presence of a single frequency range for the transmission of information, as well as to increase the reliability of operation.

five

Claims (1)

The invention The device for controlling the temperature of the submersible electric motor and the pressure at the pump intake, comprising a temperature measuring transducer, the first, second AND elements, the OR element, the power supply unit, the first pulse generator connected by cable to the power transformer, the submersible electric motor, the second pulse generator, trigger, third, fourth, fifth, sixth elements And, a display unit supplying a transformer, characterized in that. in order to extend the functionality and increase the reliability of the control, it equipped with a pressure measuring transducer, a first and second voltage-frequency converter, a time interval formation unit, a first, second, third, fourth coupling capacitors, a first, second coupling transformer, a choke, a power amplifier, a bandpass filter, a threshold element, a frequency divider, converter of bursts of pulses into rectangular pulses, first and second pulse formers, registers, pulse counters, digital-analog converters, ma scale amplifiers and a control unit, the power supply input connected via a choke to the first outputs of the first and second isolation capacitor, the second terminals of which are respectively connected to the zero point of the submersible electric motor and the secondary winding of the first isolation transformer, the primary winding of which is connected to the output of the power amplifier, outputs temperature and pressure transmitters are connected respectively via the first and second voltage-frequency converters to n to the first inputs of the first and second elements And, the second inputs of which are respectively connected to the first and second outputs of the time interval forming unit, whose input is connected to the output of the first pulse generator, the first input of the OR element is connected to the output of the first element And, the second input is connected to the output of the second element And, the output is connected to the input of the power amplifier, while the first output of the third coupling capacitor is connected to the zero point of the secondary winding of the power transformer, the second output is connected to W ary winding of the supply transformer and a first terminal of a fourth capacitor, the second terminal of which is connected to the primary winding the second isolation transformer, the secondary winding of which is connected via a bandpass filter to the input of a threshold element, the output of which is connected to the first input of the third element And and the first input of the pulse converter and rectangular pulses, the second input of which is connected to the first output of the frequency divider, and the output is connected entrances the first, second pulse shapers and the first input of the fourth element And the output of the second pulse generator is connected to the input of a frequency divider, the second output of which is connected to the second the input of the fourth element And the output of the first pulse generator connected to the installation inputs of the first, second pulse counters and the trigger input, the output of which is connected to the counting input of the first pulse counter, the outputs of which are connected to the input of the first and second registers, the output of the fourth element And is connected to the counting the input of the second pulse counter, the first output which is connected to the second input of the trigger and the first input of the fifth element I, the second output of the second pulse counter is connected to the first input of the sixth element I, the output of which is connected to the input of the second register, the output of the second pulse generator is connected to the second input of the sixth element I and the second input The fifth element And, the output of which is connected to the input of the record of the first register, the outputs of which are connected to the input of the first digital-to-analog converter, the outputs of the second register are connected to the inputs of the second digital-analogue Vågå converter, the output of which through a scaling amplifier connected to the first inputs of the indicating and control unit unit, an output of the first digital to analog converter is coupled through a scaling amplifier second inputs display unit and control unit. 70 65 66 FIG. g