RU2152006C1 - Nuclear-magnetic flow meter for multiphase medium - Google Patents

Nuclear-magnetic flow meter for multiphase medium Download PDF

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Publication number
RU2152006C1
RU2152006C1 RU98105479A RU98105479A RU2152006C1 RU 2152006 C1 RU2152006 C1 RU 2152006C1 RU 98105479 A RU98105479 A RU 98105479A RU 98105479 A RU98105479 A RU 98105479A RU 2152006 C1 RU2152006 C1 RU 2152006C1
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Russia
Prior art keywords
coil
modulation
measuring
pipeline
recording
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RU98105479A
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Russian (ru)
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RU98105479A (en
Inventor
А.И. Жерновой
Е.М. Белов
Ю.Н. Важев
Н.В. Евстафьев
М.И. Ерусалимский
Г.В. Ефимов
В.Н. Карандин
А.П. Поздняков
Original Assignee
ТОО "Фирма "Юстас"
Жерновой Александр Иванович
Белов Евгений Михайлович
Важев Юрий Николаевич
Евстафьев Николай Викторович
Ерусалимский Михаил Исаевич
Ефимов Геннадий Васильевич
Карандин Владимир Николаевич
Поздняков Александр Петрович
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Priority to RU98105479A priority Critical patent/RU2152006C1/en
Publication of RU98105479A publication Critical patent/RU98105479A/en
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Abstract

FIELD: liquid flow rate measurement in pipeline. SUBSTANCE: flowmeter has measuring pipeline, polarizer magnets positioned on it, the first modulation coil connected to modulation generator, and the first recording coil connected to recording circuit. Flowmeter also includes mark coil installed on measuring pipeline behind polarizer and connected to independent generator and to recording circuit. Flowmeter peculiarity is in that it is provided with the second modulation coil and the second recording coil, with standard specimen arranged in it, which do not embrace measuring pipeline as well as with switch. The second recording coil is connected to recording circuit, and the first and second modulation coils are connected to modulation generator through switch. Flowmeter enables accurate measurement under conditions of considerable difference in air temperature and humidity. EFFECT: enhanced accuracy of measurement. 1 dwg

Description

 The invention relates to measuring technique and can be used in nuclear magnetic flow meters for a multiphase medium, designed primarily to measure the amount of liquid in a multiphase medium flowing through a pipeline and used in conditions of significant changes in temperature and humidity, in particular for measuring the amount of oil supplied from wells mixed with gas, clay, sand, etc.
 Known flow meters based on the polarization of a fluid moving through a pipeline with a strong magnetic field, performing periodic markings by changing the nuclear magnetization, recording a nuclear magnetic resonance signal and determining the flow rate from the time stamp passes — temporary flow meters / 1 /, from the frequency of the sequence of signal markings — amplitude frequency flow meters / 2 / and phase mark sequence signals - phase-frequency flow meters / 3 /.
 The basic design of a registration-based nuclear magnetic resonance (NMR) / flowmeter includes the measuring pipeline and the magnets of the polarizer and analyzer located on it, as well as modulation and registration coils of the NMR signal / 4 /.
 Known flow meters are reliable and provide high accuracy in measuring the amount of flowing homogeneous medium when the internal volume of the measuring pipeline is completely filled.
 A disadvantage of the known nuclear magnetic flow meters is their unsuitability for measuring the amount of fluid flowing when the internal volume of the pipeline is partially filled, i.e. at a reduced flow rate, and with a multiphase flowing medium, i.e., when the measured fluid flows in a mixture with a gas or solid phase.
 A known method of measuring fluid flow with small amounts of flow through the measuring pipeline, when the fluid flow rate is less than the ratio of the volume of the pipeline covered by the coil to the longitudinal relaxation time and when the internal volume of the measuring pipeline is partially filled, in particular in the presence of liquid and air / gas / phases / 5 / .
The method includes polarizing a moving fluid with a strong magnetic field, periodically measuring by measuring nuclear magnetization, registering a nuclear magnetic resonance signal by measuring the signal amplitude and the period of the mark, the magnitude of which determines the flow rate. The amount of fluid flow is determined by the formula
Figure 00000002

where A is the amplitude of the signal measured during registration;
A 0 - the maximum amplitude of the signal;
Y 0 - the volume of the pipeline in the measurement zone;
T is the period of the mark,
or according to the calibration dependence of the signal amplitude on the period of the mark.
 The known method is implemented using a flow meter selected as the closest analogue and including a measuring pipeline, polarizer and analyzer magnets located on it, a modulation coil connected to a modulation generator, and a registration coil connected to the registration circuit.
The known flow meter has a sufficiently high accuracy of measuring the fluid flowing in a multiphase medium under insignificant and stable measurement conditions, for example, when measuring the amount of transfused blood in laboratory conditions, when A 0 is the amplitude when the pipeline volume is completely filled with polarized liquid and A is the recorded amplitude, are measured in different times, but under the same conditions and the ratio A 0 / A quite accurately adjusts the amount of polarized liquid when the pipe volume is partially filled reboot.
 The known flowmeter is unsuitable for measuring large quantities of fluid flowing in a multiphase medium under conditions of significant changes in temperature and humidity, which significantly affect the magnetic field and the magnitude of nuclear magnetic resonance, for example, to measure the amount of oil supplied from a well mixed with gas, gas condensate, water, clay, sand, etc.
Measured at different times, A 0 is the amplitude when the pipeline volume is completely filled with polarized liquid and A is the amplitude when the volume is partially filled with polarized liquid, and the A / A 0 ratio corrects the amount of liquid when partially filled or in a multiphase medium with a significant error.
 The known flow meter does not have the means to correct and coordinate the amplitude value set for the complete filling of the measured volume of the pipeline with the amplitude value recorded at the time of measurement for incomplete filling.
 The objective of the invention is to improve the accuracy of measurement by a nuclear magnetic flow meter of the amount of fluid flowing through the pipeline when the volume of the pipeline is incompletely filled with liquid or when the fluid flows in a multiphase medium, when significant changes in temperature and humidity of the ambient air take place.
 The problem is solved due to the fact that when using the features characterizing a known nuclear magnetic flowmeter containing a measuring pipe, polarizer magnets located on it, a first modulation coil associated with a modulation generator, and a first registration coil connected to the registration circuit, and the coil mark, located on the measuring pipe behind the polarizer, connected to an independent generator and connected to the registration circuit, in accordance with the invention he additional It is additionally equipped with a second modulation coil and a second recording coil with a reference sample located in it, as well as a switch, which do not cover the measuring pipeline, and the second recording coil is connected to the recording circuit, and the first and second modulation coils are connected to the modulation generator via a switch.
 The use of an additional independent coil of a mark, as well as modulation coils and a recording coil that does not cover the measuring pipeline, allows you to bring the reference amplitude recorded when the pipeline volume is completely filled with liquid to the recording conditions of the amplitude modulated at the time of measurement, to exclude the measurement error associated with various conditions modulation of the modulated and reference amplitudes recorded at different times and to increase the accuracy of measuring the amount of liquid flowing through a pipeline in a multiphase medium or when the volume of the measuring pipeline is not completely filled with liquid, determining the amount of liquid in accordance with the ratio of the measured and reference amplitudes.
 In more detail, the claimed technical solution is discussed on the drawing of a block diagram of a nuclear magnetic flow meter and a description of the operation of this flow meter.
 In accordance with the design shown in the block diagram, the nuclear magnetic flow meter includes a measuring pipe 1, polarizer magnets 2 located on it, modulation coils 3, 4 connected through a switch to modulation generator 5, and registration coils 6, 7 connected to the registration circuit eight.
 The modulation coil 3 and the registration coil 6 are located on the measuring pipe, and the modulation coil 4 and the registration coil 7 do not cover the measuring pipe.
 On the measuring pipe behind the polarizer there is also a marker coil connected to an independent generator 10 and connected to a recording circuit 8, which includes a time detector 11, a data processing device 12 and an indication device 13. A reference sample 14 is located in the recording coil 7.
The measurement of the amount flowing in a multiphase medium through the measuring pipe of a liquid flow meter is performed as follows:
1. Registration coils 6, 7 are connected to the registration circuit 8;
2. Using the switch, the modulation coil 3 is connected to the modulation generator 5;
3. The fluid flowing through the magnetic system of the polarizer 2 is polarized and passes through a portion of the pipeline covered by the detection coil 6, which sends a periodic NMR signal to the detection circuit 8, whose amplitude A is proportional to the amount of liquid in the volume of the pipeline covered by the coil;
4. Using the switch, a modulation coil 4 is connected to the modulation generator 5. In this case, the reference sample located in the coil 7, if there is a modulation voltage on the modulation coil 4, gives a signal fed to the registration circuit, the amplitude of which A e is equal to the amplitude A when the volume of the measured section is completely filled pipeline fluid without a gaseous or solid phase;
5. The ratio A / A e determine the fill factor of the volume of the measuring pipeline with liquid α .;
6. When the modulation coil 3 is turned on, the coil of mark 9 is located, which is located at a distance l upstream from the registration coil 6 and serves to demagnetize the liquid. The time detector 11 registers the time t passing the mark until the decrease of the NMR signal;
7. Using the data processing device 12 according to the formula
Figure 00000003

where S is the cross-sectional area of the pipeline between the coil mark and the registration coil, determine the flow rate of the liquid phase, which is indicated on the indicator 13.
The modulation coils 4 and registration 7 provide correction of the reference signal with amplitude A e in accordance with the environmental conditions at the time of measurement, which eliminates the error caused by changes in temperature and humidity.
 This is important when using NMR in an open environment, for example, when measuring the flow rate of oil supplied from a well in the North.
 The claimed technical solution completely solves the problem facing the invention.
 The claimed technical solution with its distinguishing features currently in the Russian Federation and abroad is unknown and meets the requirements of the criterion of "Novelty."
 The claimed technical solution is original, does not follow obviously from the existing level of technology, gives a significant positive effect and meets the requirements of the criterion of "Inventive step".
 The inventive nuclear magnetic flow meter can be manufactured industrially using well-known technical means, technologies and materials, used in industrial production and meets the requirements of the criterion of "Industrial applicability".
Literature
1. Zhernovoi A.I., Stasevich V.M. Liquid flowmeter on the basis of NMR. - Proceedings of universities. Instrument Engineering, 1965, t. VII, N 2, pp. 6-30.
 2. Catherine V.V., Zhernova A.I., Stakhov O.V. Pulse-frequency NMR flowmeter. - Measuring equipment, 1965, N 3, p. 54.
 3. Hegele P. P., Rukhin A. B. Pulse-compensated nuclear magnetic flowmeter. - Calculation and design of flow meters. L., Engineering, 1978, p. 3-7.
 4. Auth. testimonial. USSR N 1434262, IPC: G 01 F 1/716, publ. 1988, B.I. N 40.
 5. RF patent N 2005995, IPC: G 01 F 1/716, publ. 1994, B.I. N 1.

Claims (1)

  1.  A nuclear magnetic flowmeter for a multiphase medium, in particular for measuring the amount of liquid in a multiphase medium flowing through a pipeline, comprising a measuring pipe, polarizer magnets located on it, a first modulation coil connected to a modulation generator, and a first registration coil connected to the registration circuit, as well as a coil of marks located on the measuring pipe behind the polarizer, connected to an independent generator and connected to the registration circuit, characterized in that then it is equipped with a second modulation coil and a second recording coil with a reference sample located in it, as well as a switch, not covering the measuring pipeline, and the second recording coil is connected to the recording circuit, and the first and second modulation coils are connected to the modulation generator via a switch.
RU98105479A 1998-03-12 1998-03-12 Nuclear-magnetic flow meter for multiphase medium RU2152006C1 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9194972B2 (en) 2009-03-02 2015-11-24 Statoil Petroleum As Method of adjusting properties of drilling fluids and apparatus for use in such methods
RU2580841C2 (en) * 2011-11-21 2016-04-10 Кроне Аг Magnetic structural assembly for nuclear-magnetic flow meter
RU2580838C2 (en) * 2011-11-20 2016-04-10 Кроне Аг Magnetiser for nuclear-magnetic flow meter
RU2606546C2 (en) * 2012-07-16 2017-01-10 Кроне Аг Nuclear-magnetic flow meter
RU2670568C2 (en) * 2014-02-20 2018-10-23 Кроне Аг Flowmeter with a measuring device implementing tomographic measurement principle

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ЕКАТЕРИНИН В.В. и др. Импульсно-частотный ЯМР-расходомер. - Измерительная техника, 1965, N 3, с.54. *
ЖЕРНОВОЙ А.И. Ядерно-магнитные расходомеры. - Л., 1985, с.94-96. *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9194972B2 (en) 2009-03-02 2015-11-24 Statoil Petroleum As Method of adjusting properties of drilling fluids and apparatus for use in such methods
RU2580838C2 (en) * 2011-11-20 2016-04-10 Кроне Аг Magnetiser for nuclear-magnetic flow meter
RU2580841C2 (en) * 2011-11-21 2016-04-10 Кроне Аг Magnetic structural assembly for nuclear-magnetic flow meter
RU2606546C2 (en) * 2012-07-16 2017-01-10 Кроне Аг Nuclear-magnetic flow meter
RU2670568C2 (en) * 2014-02-20 2018-10-23 Кроне Аг Flowmeter with a measuring device implementing tomographic measurement principle

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