RU2408815C1 - Indicator for cleaning or diagnosing objects advancing through pipeline - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: indicator consists of receiving device mounted on external surface of pipe and of block of connection to line telemechanics. The receiving device consists of a receiving converter. A vibroacoustic converter and magnetic inductive aerial coupled to inputs of a two-channel amplifier are mounted on the base of the receiving converter adjacent to surface of the pipe. An output of the magnetic-inductive aerial is connected with inputs of digital filters and circuits of isolation of signals of magnetic fluctuation; while the output of the channel of vibroacoustic signals is connected with an input of the detector. The outputs of devices are connected with the first inputs of two-input logic circuits of AND function, while the second inputs of these logic circuits are connected to the output of the detector. The outputs of the logic circuits are coupled with the inputs of the logic circuit of OR function the output of which is connected to a micro-processing control block and through it to a converter of serial interface. By means of the channel this converter is connected with an analogue converter installed in the block of connection; this converter is tied with a device connecting the detector with a dispatcher. The control block is also coupled with the converters, output circuits of the amplifier, devices of signal processing block and converter of serial interface.

EFFECT: increased reliability with simultaneous improvement of noise immune control over objects advancing inside pipe.

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Description

The invention relates to pipeline transport and can be used in the oil and gas industry.

Known signaling devices for the passage of in-tube objects (patent RU No. 2030678, F17D 5/00, 1995; USSR Author's Certificate No. 1629684, F17D 5/00, 1991), in which acoustic radiation at ultrasonic frequencies above 100 kHz is used to record the passage of the in-pipe object. arising due to friction, impact on the pipe wall and throttling of the fluid through the gap between the object and the pipeline. These signaling devices consist of a receiving device containing piezoelectric transducers, an amplifier, a bandpass filter, a signal processing unit, and a unit for connecting to a linear telemechanics, providing dispatch communication between the operator and the control point. The disadvantage of these signaling devices is their applicability only for oil pipelines, while the search for a stuck in-pipe object causes considerable difficulties. In addition, there have been cases of false alarms of such signaling devices during rain, for this reason they have not found widespread use.

Also known are signaling devices for passing treatment or diagnostic objects through a pipeline equipped with signal sources in the form of a magnet holder with permanent magnets (USSR author's certificate No. 1285261, F17D 5/00, 1987) or in the form of a transmitter (transmitter) emitting low-frequency electromagnetic waves (Argus signaling device -SPPS ”, utility model patent No. 51235, G01S 5/16, 2006; signaling device“ Search-MP ”, technical description of the“ Pipeline Systems Service Center ”, Ufa, 2006).

Such signaling devices consist of a receiving device containing magnetic induction antennas, an amplifier, a band-pass filter, a signal processing unit, and a unit for connecting to a linear telemechanics, providing dispatch communication between the operator and the control point. A significant drawback of these devices is the low noise immunity due to the use of amplifiers with a high gain, which leads to false positives when magneto-induction antennas are exposed to extraneous pulsed electromagnetic signals, pipeline vibrations from passing vehicles, and the like. Another disadvantage of these devices is the often observed practice pass registration of the passage of the in-pipe object due to the reduced radiation power of the transmitter when its supply batteries are discharged, caused by long passage through an extended pipeline. In addition, such alarms are tuned to a single fixed frequency, while gas and oil companies use Diaskan and Pipetronix transmitters operating at a frequency of 22 Hz, Rozen transmitters operating at a frequency of 20 Hz, and transmitters of the Pipeline Systems Service Center ", Ufa, operating at a frequency of 13 Hz.

The listed disadvantages are inherent in the MDPS-3 signaling device, the technical description of IPTSE 2.003.007 TO, Tomsk, 2003, adopted as a prototype.

The purpose of the invention is to increase reliability while improving noise immunity control of the passage of in-pipe objects, both not equipped with transmitters, and with installed transmitters of any known types.

This goal is achieved using the features common to the prototype: a signaling device for passing through the pipeline treatment or diagnostic objects, consisting of a receiving device installed on the outer surface of the pipe, containing a receiving converter, an amplifier, a filter, a signal processing unit, a control unit, and a connection unit to linear telemechanics containing a communication device with a dispatcher; and distinguishing features: on the basis of the receiving transducer adjacent to the pipe surface, a vibroacoustic transducer and a magneto-induction antenna are mounted, the amplifier is respectively made according to a two-channel circuit, the processing unit contains digital filters tuned to the frequencies of the transmitters used, the scheme for extracting magnetic fluctuation signals and the matching detector of vibro-acoustic signals given criteria of rise, fall and duration, and in addition to the alarm They include a microprocessor control unit, logic chips with AND, OR, serial interface converters and a communication device with a dispatcher, the channel of the magnetic induction antenna being connected to the inputs of digital filters and to the input of the magnetic fluctuation signal extraction circuit, the channel output of the vibroacoustic transducer connected to the input of the conformity determinant its signals to predetermined criteria, the outputs of digital filters and schemes for extracting signals of magnetic fluctuations are connected to the first inputs for U-input logic circuits AND, the second inputs of which are connected to the output of the vibroacoustic signal determiner, and the outputs of all logic circuits AND are connected to the inputs of the OR logic circuit, the output of which is connected to the input of the control unit and connected to the linear telemechanics connection block via serial interface converters, the output of the block control is connected to receiving converters and devices of the signal processing unit.

The drawing shows a block diagram of a signaling device.

The signaling device consists of a receiving device 1 mounted on the outer surface of the pipe 2, and a unit for connecting to linear telemechanics 3. The receiving device contains a receiving transducer 4, and a vibroacoustic transducer 5 and a magneto-induction antenna 6 connected to the inputs are mounted on its base adjacent to the pipe surface. two-channel amplifier 7. The channel output of the magnetic induction antenna is connected to the inputs of digital filters 8 and the circuit 9 of the allocation of magnetic fluctuation signals, and the channel output is vibroacoustic signal is connected to the input of the determinant 10. The outputs of the devices 8 and 9 are connected to the first inputs of the two-input logic circuits 11 with the function AND, and the second inputs of these logic circuits are connected to the output of the determinant 10. The outputs of the logic circuits 11 are connected to the inputs of the logic circuit 12 with the function OR the output of which is connected to the microprocessor control unit 13 and through it to the serial interface converter 14. This converter is connected via a communication channel 15 to a similar converter 16 installed in the connection block cheniya 3 and connected to the communication device 17 with the alarm controller. The control unit 13 is also connected to the converters 5 and 6, the output circuits of the amplifier 7, devices 8, 9, 10 of the signal processing unit and the serial interface converter 13.

The signaling device operates as follows. When an in-tube object passes near the primary transducer 4 in the magneto-induction antenna 6, EMF is induced due to instantaneous fluctuations in the magnetic field of the pipeline, if the transmitter is not installed on the object, or, when the object is equipped with a transmitter, signals from an alternating magnetic field with a frequency determined by the type of transistor used are induced. At the same time, the vibroacoustic transducer 5 converts vibration, sound and ultrasonic vibrations of the pipe into electric signals caused by the movement of the in-tube object. Amplified by amplifier 7, the output signals of devices 5 and 6 of the primary converter 4 increase as the in-tube object approaches the installation site of the receiving device, reaches a maximum, and then decreases when this object is removed to the noise level of the amplifier channels. Using the control unit 13, these signals are processed by devices 8, 9, 10, and at the output of these devices signals of a logical unit (or logical zero) appear:

- in one of the digital filters 8 in the presence of 13.20 or 22 Hz in the signals, respectively, with a signal duration of not more than 0.4 seconds;

- in the device 9 in the presence of signals of magnetic fluctuations;

- in the device 10 in the presence of vibroacoustic signals that meet the specified criteria of rise, fall and duration.

The signals at the outputs of the logic circuits 11 with the AND function and, accordingly, at the output of the logic circuit 12 with the OR function appear only when the signals generated by the converters 5 and 6 are identified and identified as signals passing the in-tube object. Entering the control unit 13, these signals are encoded and, through the serial interface converters 14 and 16, are transmitted via the digital communication channel 15 to the connection unit 3, where they are converted using the communication device 17 to adapt to the telemechanics system used (RS-485 interface, dry contacts and etc.).

In standby mode, when there are no signals at the outputs of amplification channels 7, the operability of the converter-amplification path (devices 5, 6, 7) and the signal processing unit (devices 8, 9, 10, 11, 12, 13) are continuously monitored. To this end, from the control unit 13 to the transducers 5 and 6, combinations of the test signal of vibroacoustic vibrations with signals of the frequency of the transmitters used 13 Hz, 20 Hz, 22 Hz and the frequency of fluctuations of the magnetic field are fed alternately, and the passage of each of these combinations is checked by the output voltage of the logic circuit 12. In the absence of this voltage, a fault message is sent to the dispatcher via devices 14,16 and 17.

When any signals appear at the outputs of amplifiers 7, the control mode is interrupted, and devices 8, 9, and 10 together with the control unit 13 analyze these signals.

Thus, in the inventive signaling device, a reaction is realized to almost all factors accompanying the passage of the in-pipe object: sound and ultrasonic vibrations of the pipe, magnetic fluctuations of the steel pipe when passing through an object not equipped with a transmitter, low-frequency electromagnetic waves from radiation of a transmitter of any known type installed on the object. Since the signal to the dispatcher about the passage of the object is transmitted only if at least two of the above factors are present at the same time, while maintaining the high sensitivity of the signaling device, its increased noise immunity is ensured. This excludes the issuance of false alarms to the dispatcher, since it is extremely unlikely that vibrations on the pipeline will be identical in parameters to the vibrations of the pipeline during the passage of an object (from passing vehicles, shocks, activation of valves, etc.), simultaneously with exposure to electromagnetic interference spectrum components identical to the signals of the transmitters.

The devices included in this detector are well known from the sources of technical and patent information. These devices can be implemented either in hardware (on discrete elements) or in software (using microprocessor technology).

Devices 8, 9, 10, 11, 12, 13 are described and used:

- Digital filters 8 in the form of microcircuits are produced by many companies (for example, "Maxima");

- a unit for extracting signals of magnetic fluctuations is used in the MDPS-3 signaling device (technical description of IPTSE 2.003.007 PS);

- the unit for matching the parameters of vibroacoustic signals 10 to the specified criteria is used when implementing patent RU No. 2258864, F17D 5700, 2008;

- logic circuits 11, 12 are described in the book Shilo V.L. Popular digital circuits. - M: Radio and communications. - 1987;

- the control unit 13 is implemented on a microprocessor, for example AT91SAM7S64.

More conveniently, the aforementioned devices 8-12, as well as devices 13, 14, 16 and 17, are implemented in software. Implementation methods are described in the book A. Solonin Algorithms and processors for digital signal processing. - St. Petersburg: BHV-Petersburg, 2002.

Claims (1)

A signaling device for passing through a pipeline of treatment or diagnostic objects, consisting of a receiving device installed on the external surface of the pipe, comprising a receiving converter, an amplifier, a filter, a signal processing unit, a control unit, and a linear telemechanics connection unit containing a communication device with a dispatcher in that, based on the receiving transducer adjacent to the pipe surface, a vibroacoustic transducer and a magneto-in are mounted The antenna, amplifier, respectively, is made according to a two-channel scheme, the processing unit contains digital filters tuned to the frequencies of the transmitters used, a scheme for extracting magnetic fluctuation signals, and a determinant of the correspondence of vibroacoustic signals to the specified criteria of rise, fall, and duration, and the microprocessor control unit is additionally introduced into the signaling device, logic circuits with AND, OR functions, serial interface converters and a communication device with a dispatcher, with than the channel output of the magneto-induction antenna is connected to the inputs of digital filters and to the input of the circuit for extracting signals of magnetic fluctuations, the output of the channel of the vibro-acoustic transducer is connected to the input of the determinant of compliance of its signals with specified criteria, the outputs of digital filters and the circuit for extracting signals of magnetic fluctuations are connected to the first inputs of two-input logic circuits And the second inputs of which are connected to the output of the determinant of vibroacoustic signals, and the outputs of all logic circuits AND are connected to the inputs a logical OR circuit, the output of which is connected to the input of the control unit and via the serial interface converters connected to the connection block to a linear telemechanics, the control unit output is connected to the receiving transducer and the signal processing unit devices.

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