WO2022015193A1 - Procédé pour déterminer des valeurs physiques dans un puits - Google Patents

Procédé pour déterminer des valeurs physiques dans un puits Download PDF

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Publication number
WO2022015193A1
WO2022015193A1 PCT/RU2020/000594 RU2020000594W WO2022015193A1 WO 2022015193 A1 WO2022015193 A1 WO 2022015193A1 RU 2020000594 W RU2020000594 W RU 2020000594W WO 2022015193 A1 WO2022015193 A1 WO 2022015193A1
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Prior art keywords
sensors
frequency
piezoresonant
low
well
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English (en)
Russian (ru)
Inventor
Ильшат Дамирович ВАХИТОВ
Андрей Александрович Арбузов
Яан Адольфович Партс
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Tota Systems Tota Systems LLC LLC
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Tota Systems Tota Systems LLC LLC
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/06—Measuring temperature or pressure
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
    • G01K11/22—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using measurement of acoustic effects
    • G01K11/26—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using measurement of acoustic effects of resonant frequencies

Definitions

  • the invention relates to measuring technology, namely, to instruments used in industrial wells for determining physical quantities at one or multiple points. More specifically, the present invention relates to instruments used in a well for determining pressure, temperature, fluid composition, flow indication, determining the distribution of physical quantities along the length of the well, and measuring other quantities that can be reduced to a change in pressure, temperature, or impedance.
  • a method for measuring the spatial distribution of temperature by placing a plurality of temperature-sensitive sensors connected in parallel by a two-wire line at controlled points, applying an alternating voltage signal to one of the inputs of the line, and registering the input alternating current i Bx (t).
  • quartz piezoresonance sensors with different resonant frequencies w r i , w R 2, ... w R ⁇ , ... w R N are used; with a spectrum covering the frequency range of quartz piezoresonance sensors.
  • a method for measuring the spatial distribution of temperature (its second version) by placing a plurality of temperature-sensitive sensors at controlled points, moreover, as an alternating voltage signal supplied to one of the inputs of a two-wire line, a signal with frequency modulation in the resonant frequency range of quartz piezoresonant sensors is used.
  • a device that implements a method for measuring the spatial distribution of temperature containing a plurality of temperature-sensitive sensors connected in parallel by a two-wire line connected to a recorder, which is connected to an alternating voltage source.
  • Quartz piezoresonant sensors with different resonant frequencies w r i, w R 2, ...w R i, ...w R N the recorder contains a series-connected matching circuit, an AC amplitude recorder, a spectrum analyzer, a processing and display unit, a signal generator with a spectrum overlapping frequencies is used as an AC voltage source quartz piezoresonance sensors.
  • the prior art also knows a method for measuring the spatial distribution of temperature and a device for its implementation (RU 2206878, G01 K 7/00, published 20.06.2003).
  • a method for measuring the spatial distribution of temperature by placing N temperature-sensitive sensors connected in parallel by a two-wire line at controlled points. As temperature-sensitive sensors, quartz piezoresonant sensors with different resonant frequencies are used. After registering the input alternating current i BX (t), its amplitude-frequency spectrum S(GO) is calculated. Next, the first measurement of the resonant frequencies of the quartz piezoresonance sensors is carried out according to the position of the maxima of the amplitude-frequency spectrum B(w).
  • the device for measuring the spatial distribution of temperature contains N temperature-sensitive sensors connected in parallel by a two-wire line, a recorder and an alternating voltage source. Quartz piezoresonant sensors with different resonant frequencies were used as temperature-sensitive sensors. A multifrequency signal generator was used as an alternating voltage source. The technical result, to which this invention is directed, is expressed in increasing the accuracy, noise immunity and expanding the temperature range for measuring the spatial distribution of temperature.
  • a downhole quartz sensor with minimal use of electronics is also known from the prior art (RF patent N°2648390, E21 B 47/06, G01 L 9/00, G01 L 19/00, G01H 13/00, published on 03/26/2018).
  • the known solution is directed to the control of pressure, temperature and/or vibration under adverse environmental conditions that do not require the use of active electronic devices or a generator circuit in such conditions.
  • the proposed system and method provides for obtaining information from a resonant pressure sensor and a resonant or passive temperature sensors connected to the transmission line and located at least 100 feet (30.48 m) below the surface-mounted network analyzer.
  • the system and method uses echo frequencies from sensors to determine pressure, temperature, and/or vibration.
  • the reflected part of the energy may contain the reflected transmission energy.
  • the applied signal and the reflected portion travel along a transmission line whose impedance preferably matches that of the system.
  • a piezoresonator is used as the primary sensitive element, the resonant frequency of which is related to the measured value.
  • the input of the measuring signal is carried out in the mode of forced oscillations.
  • Full matching is impossible, therefore, additional measurement errors arise due to the residual mismatch, which in turn depends on many factors: cable temperature, temperature gradient along the cable length, cable aging, etc.
  • it is necessary to isolate the weak reflected signal of the resonators against the background of a strong excitation signal which also leads to additional measurement errors. All these shortcomings are fundamentally eliminated when using the mode of free oscillations.
  • Distinctive features of the claimed technical solution from the given analogues are: separation in time of the processes of excitation and removal of the measuring signal, simultaneous excitation of piezoresonators in the forced oscillation mode and removal of the measuring signal in the free oscillation mode, the use of low-frequency resonators
  • a resonant pressure and temperature sensor (patent US 7299678 B2, 2007) or a set of resonant sensors connected in parallel, differing in the frequency band used.
  • Each resonant sensor contains a (metal) vibrating element, the excitation and measurement signal of which is carried out using piezoelectric elements.
  • the measurement signal is picked up in the mode of free oscillations, but only one of the resonators is excited at the same time, the search for resonant frequencies is carried out with a fixed step, and one fixed frequency is checked at each step.
  • piezoresonators in which the vibrator and the excitation and pickup circuits signals are combined into one structural element.
  • Piezoresonance sensors have a higher quality factor compared to resonant ones, which makes it possible to connect a larger number of sensors with a single-wire cable with the same resolution in terms of the measured value.
  • the problem solved by the claimed invention is to remove the electronics necessary for receiving and processing the measuring signal from the zone of elevated temperatures and to expand the operating temperature range of the sensor, to increase the maximum distance between the sensor and said electronics, to increase the accuracy and noise immunity of measurements.
  • the technical result of the claimed invention is to expand the range of operating temperatures, to increase the maximum distance between the sensor and the remote electronics, as well as to improve the accuracy and noise immunity of measurements.
  • This technical result is achieved by placing one or more low-frequency piezoresonant sensors connected in parallel to each other and connected by a connecting cable with remote electronic equipment at controlled points of the well, generating a signal for excitation of oscillations of low-frequency piezoresonant sensors with a broadband electrical signal by means of remote electronic equipment, after generating of the excitation signal of low-frequency piezoresonant sensors stop generating the signal of excitation of vibrations of low-frequency piezoresonant sensors and switch the remote electronic equipment to the input, in the mode of free oscillations of low-frequency piezoresonant sensors, a measuring signal containing damped sinusoids is received and the spectrum of the measuring signal is determined, while the spectrum contains resonant peaks in the amount , corresponding to the number of placed low-frequency piezoresonant sensors, and according to the position of the maximum of each peak, the resonant frequency of the corresponding low-frequency piezoresonant sensor is determined, the physical quantities are determined at the controlled points of the well according to the known dependences of the
  • the remote electronic equipment is placed at the wellhead or placed in the well zone, free from exposure to elevated temperatures.
  • connection of low-frequency piezoresonant sensors with remote electronic equipment carried out by means of a single-core connecting cable or by means of a connecting cable made in the form of a shielded twisted pair.
  • diagnostics of breakage and short circuit of the connecting cable is additionally carried out.
  • the total frequency band occupied by the sensors is divided into several ranges, and the measuring signal is sequentially excited and picked up sequentially range by range, while in each range all resonators are excited simultaneously.
  • the performance of low-frequency piezoresonance sensors is additionally controlled by the level and attenuation of the useful signal.
  • pressure and temperature are measured as physical quantities.
  • the temperature field is measured along the working interval of the well using a plurality of temperature sensors located at a given step in this interval.
  • the inflow and injectivity profiles are calculated from the measured temperature field in different well operation modes
  • reference low-frequency piezoresonant sensors are additionally installed as an identifier of the downhole sensor system.
  • the device for determining physical quantities in the well contains a plurality of parallel-connected low-frequency piezoresonant sensors placed in the well and remote electronic equipment for receiving and processing the measuring signal connected to the said sensors via a connecting cable
  • the remote electronic equipment consists of a microcontroller , connected to a digital-to-analog converter, which is connected to a buffer amplifier, which in turn is connected to an analog switch connected to the input amplifier of the measuring signal, which is connected to an analog-to-digital converter connected to the mentioned microcontroller, and the analog switch is connected to downhole piezoresonant sensors by means of a connecting cable, and low-frequency piezoresonant sensors are made with an operating frequency band lying within the operating frequency band of the said connecting cable.
  • the connecting cable is made of a single core or is made in the form of a shielded twisted pair.
  • the implementation of the claimed technical solution is made with the possibility of operation at temperatures up to +500...+1000°C.
  • low-frequency piezoresonant sensors are used, the operating frequency band of which lies within the operating frequency band of the connecting cable, the length of which can be several kilometers, the measuring signal is picked up in the free oscillation mode, which excludes the excitation signal spectrum from the measuring signal spectrum, which in in turn eliminates the influence of the connecting cable on the measurement results (with the exception of signal attenuation) and improves the measurement accuracy.
  • Fig.1 structural and functional diagram of the measuring system
  • Fig.2 an example of a measuring system on parallel-connected piezoresonance sensors (PRD): a) conversion characteristic; b) amplitude-frequency characteristic (spectrum); c) connection diagram.
  • PRD piezoresonance sensors
  • 1 remote equipment 2 connecting cable; 3 - downhole piezoresonant sensors; 4 - microcontroller; 5 - ADC; 6 DACs; 7 buffer amplifier; 8 - analog switch; 9 - input amplifier.
  • the device for determining physical quantities in the well consists of remote equipment (1) for receiving and processing the measuring signal of piezoresonant sensors (3), downhole piezoresonant sensors (3) connected in parallel and a connecting cable (2) connecting the remote equipment (1) and said piezoresonant sensors (3) located in the well.
  • Remote equipment (1) consists of a microcontroller (4) of remote equipment.
  • the outputs of the microcontroller (4) are connected to the input of the digital-to-analog (6) converter.
  • the outputs of the digital-to-analog (6) converter are connected to the input of the buffer amplifier (7), the outputs of which are connected to the analog switch (8).
  • the outputs of the analog switch (8) are connected to downhole piezoresonant sensors (3) by means of a connecting cable (2). Piezo resonant sensors (3) are connected in parallel.
  • the analog switch (8) is also connected to the input amplifier (9) of the measuring signal, the outputs of which are connected to the inputs of the analog-to-digital converter (5), the outputs of which are connected to the inputs of the microcontroller (4).
  • the device works as follows.
  • the microcontroller (4) generates an excitation signal, which is converted to an analog form using a digital-to-analog converter (6), amplified by a buffer amplifier (7) and fed through an analog switch (8) to the cable (2).
  • the cable (2) is disconnected from the buffer amplifier (7) and connected to the input amplifier (9) of the measuring signal.
  • the measuring signal is the sum of damped sinusoids with the natural frequencies of the piezoresonant sensors (3).
  • the amplified measuring signal is digitized using an analog-to-digital converter (5) and fed to the microcontroller (4).
  • the microcontroller (4) records the implementation of the measuring signal, calculates the spectrum of this signal, determines the natural frequencies of the piezoresonant sensors (3) from the maxima of the spectrum, then estimates of the measured physical quantities are determined from the measured values of the frequency and the known characteristics of the conversion of the sensors.
  • the measurement accuracy is increased due to the use of piezoresonance sensors, the elimination of the contribution of the excitation signal to the measuring signal, the simplification of the signal input circuit (the exclusion of matching circuits), the use of a low-noise amplifier at the input, the simplification of the measurement signal model and the use of associated accurate frequency estimation methods, all this is ultimately ensured by using the free oscillation mode.
  • low-frequency piezoresonators of the tuning fork type with bending oscillations were used as piezoresonant sensors.
  • the low-frequency resonators used are matched to the bandwidth of the connecting cable.
  • Noise immunity can be additionally improved by using a shielded twisted pair instead of a single-core cable (core plus armor).
  • Low-frequency resonators have, as a rule, frequencies from 30 to 70 kHz. This allows you to significantly increase the maximum possible cable length. So, when using high-frequency piezoresonators, the possible cable length is from 30 to 600 m. When using low-frequency resonators, it is possible to use a cable with a length of about 3 km, and there is a potential possibility of increasing the cable length to 6-10 km.
  • An increase in the cable length is possible due to the use of piezoresonators with lower operating frequencies and / or a connecting cable with a wider frequency band, which in turn is achieved by reducing the linear resistance of the cable, for example, by increasing its diameter, by using conductors with lower resistivity, reduction of insulator losses, as well as the transition from a single-core cable to a two-core twisted-pair cable, which further reduces the level of interference.
  • high-temperature piezoresonance sensors are used. Due to the use of high-temperature piezoresonant sensors and the removal of electronics from the zone of elevated temperatures, the operating temperature range of the claimed device is expanded.
  • EFFECT possibility of operation of the claimed device in a wide range of operating temperatures (from -270 to +500...+1000°C) and other difficult conditions is achieved.
  • piezo materials such as langasite, that extend the potential temperature range to about +1000°C.
  • the list of complex conditions is not limited to this.
  • .piezoresonant sensors also work stably at elevated levels of radiation, at low (cryogenic) temperatures (down to -269°C).
  • low-frequency resonators have a much cleaner monofrequency spectrum over a wide frequency band, in contrast to high-frequency resonators, whose spectrum is replete with many difficult-to-control spurious resonances in the operating frequency region, making it difficult to select several resonators that can be connected to one and the same cable.
  • low-frequency resonators can be used to build systems in which 100 or more resonators are connected to the same single-core cable.
  • piezoresonance sensors Another useful feature of piezoresonance sensors is that information about the measured value is contained in the value of the resonant frequency of the sensor, and the relative change in this frequency in the range of measured values is usually small (1 ... 10% of the nominal frequency). This allows multiple sensors with different frequencies to be connected in parallel using the same cable.
  • Remote electronic equipment can be located at the wellhead (ground version) or in the zone of the well, free from the effects of elevated temperatures (borehole version).
  • Fig. 2 The principle of operation of the measuring system based on parallel-connected low-frequency piezoresonant sensors is illustrated in Fig. 2.
  • the frequency of each resonator in the chain is related to its measured value.
  • Dependence is determined at the calibration stage.
  • the measurement cycle includes the excitation of oscillations in the resonators using a broadband electrical signal, the estimation of resonant frequencies (for example, by the position of the maxima of the amplitude spectrum of the total output signal) and the restoration of the values of the measured quantities.
  • the length of the connecting cable can be several (3 or more) kilometers;
  • - many sensors can be connected in parallel (100 or more);
  • the simplest diagnosis for a cable break or short circuit can be carried out by measuring the resistance between the conductors at the end of the cable. To diagnose a break, a resistor with a resistance greater than the total cable resistance is installed at the end of the cable. In the event of a break, the resistance at the end of the cable increases, in the event of a short circuit, it decreases.
  • resistors with a resistance of about 100 Ohm. This, on the one hand, does not lead to a significant decrease in the useful signal from the sensors connected to the upper segment of the cable, on the other hand, it makes it possible to obtain a measuring signal from the sensors connected to the upper segment of the cable in the event of a short circuit in the lower segment.
  • the output value is not available for direct measurement (with an ohmmeter, voltmeter, etc.), but is a parameter of the measuring signal.
  • the signal is an electrical oscillation with a frequency close to the natural frequency of the piezoresonance sensor. If many sensors are connected to one cable, then the output signal will be the sum of oscillations with different frequencies. In addition to the useful signal, one should keep in mind the presence of interference and noise, which in turn are divided into external and internal. Among the (inevitably occurring) internal interference is the excitation signal of the piezoresonators. To suppress it, the cable is calibrated, including the determination of its amplitude-frequency characteristic, the mathematical or physical model of the cable and/or the excitation signal is determined for its subtraction from the measuring signal, etc.
  • the piezoresonator is included in the feedback loop of the amplifier.
  • the self-oscillation mode creates the most powerful (noise-resistant) and convenient for further processing measuring signal, but is the least suitable for the system under consideration, since it is associated with two significant limitations: a) requires a relatively close placement of electronics (in most cases, the distance between the amplifier and the resonator cannot exceed 1 m), b) there are difficulties with the simultaneous excitation of oscillations at several frequencies.
  • the source of the excitation signal is an external sweeping frequency generator, and the piezoresonator plays the role of a band-pass filter that changes the amplitude and phase of the signal at frequencies near its own resonant frequency. It allows you to noticeably (hundreds of times) increase the length of the connecting cable. This requires careful matching of the impedances of the cable and the piezoresonator, or the use of other methods to reduce the influence of the cable on the output measurement signal.
  • the piezoresonator performs free damped oscillations, that is, the resonator plays the role of an active source of the measuring signal. These oscillations are pre-excited, for which the mode of self-oscillations or forced oscillations can be used.
  • the processes of excitation of oscillations in piezoresonance sensors are separated in time and the output measuring signal is taken, excitation in the forced oscillation mode, and removal in the free oscillation mode.
  • the claimed method is characterized by the separation in time of the processes of excitation and removal of the measuring signal, the simultaneous excitation of piezoresonators in the mode of forced oscillations and the removal of the measuring signal in the mode of free oscillations.
  • the claimed method allows the measurement of physical fields (temperature, pressure, and others) along the length of the well or the controlled interval of the well.
  • a plurality of piezoresonant sensors are placed that measure the required physical quantity.
  • the controlled interval of the well and the depth step are selected based on the conditions of the measurement task and the required depth resolution. In the simplest case, a constant depth step is chosen.
  • a variable depth step can also be implemented, which makes it possible to increase the depth resolution in the intervals of greatest interest in terms of the measurement task.
  • Example 1 A downhole pressure and temperature sensor containing piezoresonant pressure sensors (one resonator with a frequency range of 50.0...52.4 kHz in a pressure range of 0...60 MPa), temperature (two resonators, one of which performs the function of a hot reserve, with nominal frequencies of 32.5 kHz and 33.5 kHz and a frequency range of 210 Hz in the temperature range of 0 ... 100 C), as well as one reference resonator (used to identify the downhole sensor, with a frequency of 35.7 kHz).
  • the sensor is installed at a depth of 2 km. To excite oscillations, the remote electronic equipment generates a signal with a frequency varying in the frequency range from 32 to 53 kHz.
  • the remote electronic recording equipment switches to the input and digitization of the measuring signal.
  • the measurement signal includes four damped sinusoids and measurement noise.
  • the spectrum of realization of the measuring signal is determined.
  • the spectrum contains four resonant peaks according to the number of resonators.
  • the position of the maximum of each peak determines the resonant frequency of the corresponding resonator.
  • the values of the measured quantities are determined from the known transformation characteristic.
  • Example 2 Assembly of two downhole pressure and temperature sensors.
  • Each sensor contains 4 resonators, similar to example 1.
  • the first sensor contains a pressure resonator with a frequency range of 46.7...49.4 kHz in the pressure range of 0...60 MPa, temperature resonators with nominal frequencies of 32.0 kHz and 33.0 kHz, a reference resonator with a frequency 34.4 kHz.
  • the second sensor contains a pressure resonator with a frequency range of 50.0...52.4 kHz in the pressure range of 0...60 MPa, temperature resonators with nominal frequencies of 32.5 kHz and 33.5 kHz, and a reference resonator with a frequency of 35.7 kHz.
  • the sensors are installed at a depth of 2 km.
  • Example 3 Assembly of downhole sensors, including two pressure resonators and 100 temperature resonators, located with a step of 1 m along the length of the controlled section of the wellbore (100 m).
  • the first pressure resonator has a frequency range of 46.7...49.4 kHz in the pressure range of 0...60 MPa
  • the second pressure resonator has a frequency range of 50.0...52.4 kHz in the pressure range of 0...60 MPa
  • the nominal frequencies of the temperature resonators are distributed in frequency bands 30...46 kHz and 53...70 kHz with a constant ratio of the nominal frequencies of neighboring resonators.
  • the first pressure resonator is installed at a depth of 1.1 km
  • the second pressure resonator is installed at a depth of 1.0 km
  • temperature resonators are installed between them with a step of 1 m in order of increasing their nominal frequencies.
  • the measurement signal is received and processed in the same way as in example 1.
  • Example 4 Downhole sensor assembly including two pressure resonators and 100 temperature resonators located in a production well producing oil from a reservoir located at depths from 1050 m (reservoir top) to 1070 m, with a step of 1 m in the depth interval from 1.1 km (bottomhole) up to 1.0 km, as in example 3.
  • Obtaining and processing of the measuring signal is carried out in the same way as in example 1, while bottomhole pressure, pressure at the top of the formation and temperature profile are determined.
  • the well In the first mode with a flow rate of 50 m3/day. the well is constantly working.
  • the well In the second mode, the well is temporarily (for 3 days) transferred to an increased flow rate of 70 m3/day.
  • two sets of measurements of temperature and pressure profiles are determined at different flow rates in the steady state operation of the well.
  • the relative oil flow rates of cooperating reservoirs are estimated.
  • Piezo resonant sensors can be classified according to the frequency range they occupy.
  • low-frequency (LF) resonators are used, which allow (compared to high-frequency resonators) to use a longer connecting cable, characterized by a narrower operating frequency band (the operating frequency band of the cable decreases with increasing length).
  • An additional advantage of low frequency resonators is that they have a clean spectrum, which makes it easy to connect multiple piezo resonant sensors in parallel.

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Abstract

Le procédé de l'invention consiste à placer dans des points contrôlés d'un puits un ou plusieurs capteurs piézo-résonnants basse fréquence qui sont connectés en parallèle entre eux par un câble. On génère un signal d'excitation d'oscillations des capteurs avec un signal à bande large en utilisant un appareillage électronique déporté. Après la génération du signal des capteurs, on commute l'appareillage électronique déporté vers l'entrée. En mode d'oscillations libres des capteurs, on effectue la réception du signal de mesure comprenant des sinusoïdales qui s'atténuent. On détermine le spectre du signal de mesure. En fonction de la position du maximum de chaque pic, on détermine la fréquence de résonance du capteur correspondant. On détermine les valeurs physiques dans les points contrôlés du puits en fonction des dépendances connues de la fréquence de résonance des capteurs par rapport aux valeurs correspondantes des valeurs physiques à mesurer. L'appareillage électronique déporté comprend un micro-contrôleur connecté à un convertisseur numérique-analogique, lequel est connecté à un amplificateur tampon qui est à son tour connecté à un commutateur analogique connecté à un amplificateur d'entrée du signal de mesure lui-même connecté à un convertisseur analogique-numérique connecté audit micro-contrôleur. Les capteurs possèdent une bande de fréquence fonctionnelle se situant dans la bande de fréquence fonctionnelle d'un câble de connexion.
PCT/RU2020/000594 2020-07-14 2020-11-10 Procédé pour déterminer des valeurs physiques dans un puits Ceased WO2022015193A1 (fr)

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EA202000233A EA037631B1 (ru) 2020-07-14 2020-07-14 Способ определения физических величин в скважине на основе пьезорезонансных датчиков без электроники и устройство для его осуществления
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115684625A (zh) * 2022-09-26 2023-02-03 哈尔滨工业大学 一种二总线多路温度测量装置及方法
RU2857079C1 (ru) * 2025-09-09 2026-02-25 Государственное автономное образовательное учреждение высшего образования "Альметьевский государственный технологический университет "Высшая школа нефти" (ГАОУ ВО АГТУ ВШН) Способ защиты электроники скважинного прибора при работе в условиях повышенного давления и скважинный прибор для измерения давления и температуры

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