RU35828U1 - DEVICE FOR MEASURING VOLUME FLOW OF FLUID IN A PIPELINE - Google Patents

Description

OBJECT-DEVICE; I111111Sh | 11111,111R

DEVICE FOR MEASURING VOLUME FLOW OF FLUID IN

2003130152

IPC E 21 at 47/10, G 01 F1 / 00

PIPELINE

v The utility model relates to the field of oil production and can be used to control the volumetric flow rate of fluid flowing through the pipeline of wells equipped with deep-well (GPGN) or electric centrifugal (ESP) pumps. A device for measuring the volumetric flow rate during portioned fluid movement in a pipeline during operation of a sucker rod pump, comprising a transducer of acoustic noise generated by a moving fluid flowing through a section of a fixed section of the pipeline, a processing unit including a signal portion of the liquid portions, a valve, pulse generator, counter, timer, and digital display (see RF patent No. 2140538, class E 21 B 47/10, publ. BI No. 30 for 1999). The disadvantage is that the device does not work when measuring the volumetric flow rate of a continuous flow of fluid created during the operation of the ESP. In this case, the batch mode of fluid flow in the pipeline is absent and the principle of batch processing of the volume flow information cannot be used. The closest in technical essence and the achieved result to the proposed one is a device for measuring the volumetric flow rate of liquid in the pipeline (see RF patent No. 2195633, class G 01 F1 / 66, publ. BI No. 36 for 2002), containing acoustic a sensor-converter, a processing unit including a threshold device, a signal generator for portions of a liquid, a switch, a pulse generator, a counter, a timer, an amplitude analysis module consisting of a block of frequency filters and a subtractor, and a digital display. The device allows you to measure the volumetric flow rate of the liquid in the pipeline both in batch and continuous modes of movement. The disadvantage is that, firstly, there is no possibility of connecting the device to the telemetry system to ensure centralized and operational collection of measurement results, and secondly, the results of measuring the volumetric flow rate I of liquid in the pipeline have a significant measurement error due to the fact that the unit the frequency filters of the amplitude analysis module is performed using filters tuned to inject signals at given frequencies, without taking into account the possible change in the frequency of manifestation of acoustic noise moves created by a fluid flowing through a fixed section of a pipeline as a result of changes in the physicochemical properties of the liquid or the design features of the pipeline and valves. The technical task of the invention is to create a device for the integrated measurement of fluid flow in the pipeline during the operation of wells with SHGN and ESP, which allows to reduce the measurement error, to reduce the number of repeated, duplicate measurements in a changing fluid composition or design features of the pipeline and valves connecting the device to the telemetry system to ensure centralized and operational collection of measurement results. The stated technical problem is solved by the described utility model of a device for measuring the volumetric flow rate of a liquid in a pipeline containing an acoustic transducer, a processing unit including a threshold device, a signal unit for liquid portions, a switch, a pulse generator, a counter, a timer, and an amplitude analysis module, and digital scoreboard. New is that the amplitude analysis module is based on a pre-amplifier, two tunable filters and an analysis and control unit, and the output of the transducer is connected to the input of the pre-amplifier, the output of which is connected to the inputs of the tunable filters, the outputs of which are connected to the corresponding inputs of the unit analysis and control, the control inputs of the resonant frequency of tunable filters are connected to the corresponding outputs of the analysis and control unit, and the output of the analysis and control unit connected to the switch processing unit further comprises a mode setting unit of measurement and alignment module with a telemetry system, wherein the pulse generator output is connected to the input of the measurement mode setting unit, respective outputs of which are connected to the inputs of the meter module and the coordination with the telemetry system. Of the available sources of patent and scientific and technical literature, we do not know the claimed combination of distinctive features. Therefore, I proposed utility model of the device meets the criteria of "Novelty and" Industrial applicability. Figure 1 presents a block diagram of a useful model of a device for measuring the volumetric flow rate of a liquid in a pipeline. Figure 2 shows the spectrum of the acoustic noise signal generated by the movement of fluid through a fixed-section pipeline, and the result of the analysis of the difference in amplitudes of the inserted signals according to the prototype (I - 0.9 kHz ... 1.1 kHz, 11-3.4 ... 4.0 kHz). Figure 3 shows the spectrum of the acoustic noise signal generated by the movement of fluid through a fixed-section pipeline, and the result of the analysis of the difference in amplitudes of the extracted signals according to the proposed utility model (I - 20 Hz ... 2.7 kHz, II - 2.2 ... 4.0 kHz). Figure 4 presents the dependence of the relative error of the measurement results on the speed of fluid flow through a fixed section pipeline according to the prototype and the proposed utility model. A device for measuring the volumetric flow rate of a liquid in a pipeline consists of (see Fig. 1) an acoustic transducer 1, a processing unit 2, and a digital display 3. The processing unit 2 includes a threshold device 4, a signal generator for portions of a liquid 5, a switch 6 , pulse generator 7, counter 8, timer 9 and amplitude analysis module 10. New elements are those forming the amplitude analysis module, namely: preamplifier 11, tunable filter 12, tunable filter 13 and analysis and control unit 14, and the processing unit Tkki 2 additionally contains a block for setting the measurement mode 15 and a module for matching with the telemetry system 16. The principle of operation of the device for measuring the volumetric flow rate is considered by the example of measuring the volumetric flow rate of oil wells. The device for measuring the flow rate interacts with the upper part of the oil well 17, to which the fixed section 18 flow discharge pipe is connected. An acoustic transducer 1 is attached to the external part of the fixed flow flow pipe 18 so that it makes acoustic contact with the fluid flowing through the flow pipe fixed section 18.

The fluid from the oil well 17 into the flow line of fixed section 18 is supplied by a deep-well sucker rod pump (SHG) (not shown in FIG.) In the form of portions separated in time.

When operating an oil well 17 with an electric centrifugal pump (ESP) (not shown in FIG.), A continuous supply of fluid to the flow line of a fixed section 18 is performed.

The passage of fluid through a flow line of fixed cross section 18, on which an acoustic transducer 1 is fixed, causes the appearance of specific noises. With the appearance of these noises, the acoustic sensor transducer 1 senses them and converts them into electrical signals of alternating current of various amplitudes with a spectrum of frequency components lying within

20 Hz-12 kHz.

The functioning of the device units is considered for two operating modes: 1. When measuring the volumetric flow rate of a well with SHG, a portion of fluid passes through a fixed section 18 pipeline at intervals proportional to the swing frequency of the rocking machine, which creates reciprocating movements (up and down) of the pump plunger. The volume of each portion and, consequently, the time it takes to pass through the fixed section pipe 18, where the acoustic transducer 1 is installed, are different and depend on the filling of the plunger with fluid and reservoir conditions in the well. The noise from each portion of the liquid converted by the acoustic transducer 1 into electrical signals Uum is fed to input 19 of the threshold device 4, in which they are extracted above the level of background noise interference if arising in the pipeline as a result of the wellhead equipment. From the output 20 of the threshold device 4, the signals of the portions of the liquid are fed to the input 21 of the driver of the signals of the portions of the liquid 5, which converts them into analog DC signals and generates portions of potentials and from the same amplitude and different durations TT. From the output 22 of the signal generator of the portions of the fluid 5, these signals are fed to the input 23 of the switch 6, which in this mode of operation of the well sends them from the output 24 to the input 25 of the pulse generator 7, made according to the generator circuit, the pulse frequency of which changes proportionally to the control signal supplied to its input stress. Each potential 7 received at the input 25 of the pulse generator 7 and, from a portion, initiates generation of a packet of standard pulses of a fixed frequency F in it, corresponding to the volumetric flow rate IQ of the liquid through the pipeline section per unit time. The number of pulses in the packet depends on the duration of the control potential and output 26 of the pulse generator 7, these pulses are fed to the input 27 of the block setting the measurement mode 15, which sets the measurement mode and subsequent display of information. Three measurement modes are possible: 1) autonomous - with the display of the measurement results on a digital display 3, 2) stationary - with the connection through the matching module with the telemetry system 16 to the telemetry system and the transmission of the measurement results to the controller, 3) stationary portable - with the connection through the module coordination with the telemetry system 16 to the telemetry system and transferring the measurement results to the dispatcher’s console and simultaneously displaying the measurement results on a digital display 3. Depending on the selected measurement mode The pulses are fed from the output 28 of the unit for setting the measurement mode 15 to the input 29 of the counter 8, which accumulates them, or from the output 30 of the unit for specifying the mode of measurement 15 to input 31 of the matching module with the telemetry system 16 with subsequent transmission of information via the telemetry system to the controller . The time cycle of the measurement of TC (hour, day) is set by a timer 9, from the output of which 32 a resolution-enabling signal is supplied to the control input 33 of the counter 8. At the end of the time cycle Tc, during which N packets of pulses arrive at the counter, the number Q is recorded in counter 8: / h T ,, ((/) N (na4eK) ac (h, day} (And corresponding to the volume flow for a given time This measurement result from the output 34 of the counter 8 is fed to the input 35 of the digital display 3, on which it is indicated 2. 2. When performing flow measurements at an oil well 17 with an ESP, when the fluid flow in the flow line of a fixed section 18 is continuous, acoustic sensor signal Atelier 1 is also unbroken and has a different amplitude depending on the flow velocity.The flow signal with a wide spectrum of frequency components is fed to the input 36 of the preamplifier 11 of the amplitude analysis module 10., 3.5 fiuMH / G11 1 / sec) 7 sec} Tc (h , days) H from the output 37 of the preliminary amplifier 11, the flow signal is fed to the input 38 of the tunable filter 12 and the input 39 of the tunable filter 13. From the output 40 of the tunable filter 12 and the output 41 of the tunable filter 13, the signals extracted by these filters in the given frequency bands then the analog DC signals are fed to the corresponding inputs 42 and 43 of the analysis and control unit 14. The operation of the amplitude analysis module 10 according to the proposed utility model is as follows. As a result of the studies, it was found that the acoustic noise generated by the movement of fluid through a fixed-section pipeline 18 appears in the frequency range 2.2 ... 4.0 kHz and is characterized by a maximum amplitude in the indicated frequency range (see Fig. 3), moreover the frequency of manifestation of the maximum acoustic noise depends on the physicochemical properties of the liquid or the design features of the pipeline and valves. At the same time, acoustic noises additionally contain components that characterize the level of the natural background noise of the pipeline, characterized by a minimum signal amplitude in the frequency range of 20 GP (the minimum frequency of conversion of acoustic noise into electrical signals) ... 2.2 kHz (set in the frequency range 2.2 kHz ... 4.0 kHz the frequency of manifestation of the maximum acoustic noise created by the movement of fluid through a fixed-section pipeline 18). And acoustic noise, manifested in the frequency region of less than 0.8 kHz and sometimes having a higher amplitude, is caused by the operation of mechanical devices. The selection of the signal, characterized by the manifestation of acoustic noise generated by the movement of fluid through a fixed-section pipe 18 and the maximum amplitude, is performed by a tunable filter 12 in the frequency range 2.2 ... 4.0 kHz (see figure 2) and is carried out in two stages . First, the search for a frequency characterized by the manifestation of a signal with a maximum amplitude in the indicated frequency range. Second, the selection of the signal at the set frequency. The search for the frequency characterized by the manifestation of the signal with the maximum amplitude is carried out by the analysis and control unit 14 by sequentially comparing the amplitudes of the signals emitted by the tunable filter 12. In this case, the frequencies are scanned by changing the resonant frequency of the tunable filter 12 by supplying a resonance frequency control signal H tunable filter 12 from the output 44 of the analysis and control unit 14 to the input 45 of the tunable filter 12. After the frequency characterized by using a signal with a maximum amplitude, the analysis and control unit 14 sets the frequency range of 20 Hz (the minimum frequency of conversion of acoustic noise into electrical signals) ... 2.2 kGp (set in the frequency range of 2.2 kHz ... 4.0 kHz manifestations of the maximum acoustic noise generated by the movement of fluid through a fixed section pipe 18), in which it searches for and extracts a signal characterized by the manifestation of intrinsic background acoustic noise of a fixed section pipe 18 and a minimum amplitude , the incineration of which is carried out by the tunable filter 13 and is carried out in two stages. First, the search for a frequency characterized by the appearance of a signal with a minimum amplitude. Second, the selection of the signal at the set frequency. The search for the frequency characterized by the manifestation of the signal with the minimum amplitude is carried out by the analysis and control unit 14 by sequentially comparing the amplitudes of the signals emitted by the tunable filter 13. In this case, the frequencies are scanned by changing the resonant frequency of the tunable filter 13 by applying a control signal to the resonant frequency of the tunable filter 13 from output 46 the analysis and control unit 14 to the input 47 of the tunable filter 13. After the frequency, characterized by the manifestation m of intrinsic background acoustic noise of a pipeline with a fixed cross section 18 and minimum amplitude, in the analysis and control unit 14, the absolute values of the differences (differences) in the amplitudes of the signals generated by the tunable filter 12 and the tunable filter 13 are generated. From the output 48 of the analysis and control unit 14 these amplitude differences pass to the input 49 of the switch 6, set to the mode of operation with the ESP, and from its output 24 are fed to the input 25 of the pulse generator 7. The frequency of the generated pulses corresponding to the volume the flow rate of the fluid flowing through the pipeline of fixed cross section 18 per unit time varies depending on the difference (difference) in the amplitudes of the signals inserted by the tunable filter 12 and the tunable filter 13, in proportion to the volumetric flow rate. Output 26 of the pulse generator 7 is a continuous sequence of standard pulses.

following with different frequencies, is fed to input 27 of the unit for setting measurement mode 15.

Depending on the selected measurement mode, pulses are supplied from the output 28 of the setting block for the measurement mode 15 to the input 29 of the counter 8, which accumulates them, or from the output 30 of the block for setting the measurement mode 15 to the input 31 of the matching module with the telemetry system 16 with subsequent transmission of information telemetry system to the dispatcher console.

The number of pulses accumulated in the counter 8 for a given time cycle, organized by the input 33 of the counter 8 by the timer 9, from the output 34 of the counter 8 is fed to the input 35 of the digital display 3, where it is indicated as the volume flow rate.

Changing the elements that form the amplitude analysis module in accordance with the proposed utility model makes it possible to increase the accuracy of signal extraction by about 2 times, which is characterized by the manifestation of intrinsic background acoustic noise of a fixed section pipeline (see point 2 point A and figure 3 point C), and signal, characterized by the manifestation of acoustic noise generated by the movement of fluid through a fixed-section pipeline (see figure 2 point B and figure 3 point D), and, therefore, reduce the error of the measurement results The flow velocity of the fluid through a fixed-section pipeline, and the associated volumetric flow rate of the fluid, is from 1.5 to 2.5 times (see FIG. 4).

Using the proposed utility model of a device for measuring the volumetric flow rate of a liquid in a pipeline allows a comprehensive measurement of the volumetric flow rate of wells with SHGN and ESP. At the same time, in the mode of operation with the ESP, the error in the measurement results decreases from 1.5 to 2.5 times, which reduces the number of repeated, duplicate measurements in the conditions of periodically changing liquid composition or design features of the pipeline and shutoff valves, and providing the possibility of connecting the device to the telemetry system allows to provide a centralized, operational collection of measurement results and reduce the cost of field measurements.

, J /.

Claims (1)

A device for measuring the volumetric flow rate of fluid in a pipeline, comprising an acoustic transducer, a digital display and a processing unit including a threshold device, a signal unit for portions of a liquid, a switch, an amplitude analysis module, a pulse generator, a counter and a timer, characterized in that the module amplitude analysis is based on a pre-amplifier, two tunable filters and an analysis and control unit, and the output of the sensor-converter is connected to the input of the pre-amplifier I, whose output is connected to the inputs of tunable filters, the outputs of which are connected to the corresponding inputs of the analysis and control unit, the resonance frequency control inputs of the tunable filters are connected to the corresponding outputs of the analysis and control unit, and the output of the analysis and control unit is connected to the switch, the processing unit additionally contains the unit for setting the measurement mode and the module matching with the telemetry system, and the output of the pulse generator is connected to the input of the unit for setting the measurement mode, respectively uyuschie outputs are connected to inputs of the counter and matching with the telemetry module system.