CN105628118A - Thermodynamics-based flow meter and thermodynamics-based flow measuring method - Google Patents
Thermodynamics-based flow meter and thermodynamics-based flow measuring method Download PDFInfo
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- CN105628118A CN105628118A CN201610087498.9A CN201610087498A CN105628118A CN 105628118 A CN105628118 A CN 105628118A CN 201610087498 A CN201610087498 A CN 201610087498A CN 105628118 A CN105628118 A CN 105628118A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000000523 sample Substances 0.000 claims abstract description 131
- 239000012530 fluid Substances 0.000 claims abstract description 53
- 238000010438 heat treatment Methods 0.000 claims abstract description 29
- 238000005259 measurement Methods 0.000 claims abstract description 24
- 229910052751 metal Inorganic materials 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims abstract description 5
- 229910000897 Babbitt (metal) Inorganic materials 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 229910000521 B alloy Inorganic materials 0.000 claims description 4
- 229910001006 Constantan Inorganic materials 0.000 claims description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 230000005284 excitation Effects 0.000 claims description 4
- 230000002706 hydrostatic effect Effects 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 239000000741 silica gel Substances 0.000 claims description 4
- 229910002027 silica gel Inorganic materials 0.000 claims description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 4
- 229910052721 tungsten Inorganic materials 0.000 claims description 4
- 239000010937 tungsten Substances 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims 6
- 229910052697 platinum Inorganic materials 0.000 claims 3
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000009795 derivation Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000004308 accommodation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
- G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention aims to provide a producing well downhole flow measuring method based on the principle of thermodynamic thermal field conduction, wherein a function relationship between fluid flow and thermal loss is obtained via theoretical derivation and standard well graduation and a fluid flow is obtained by calculating heating probe power and temperature and fluid environmental temperature, and to provide a thermodynamics-based flow meter, comprising a shell, and a THR heating probe and a PT1000 temperature sensor probe that are disposed in the shell.A wire pass tube passing through the shell is arranged in the shell; the THR heating probe is disposed at one inner end o the shell, a metal heating wire is disposed in the THR heating probe and connected with an electronic instrument through a lead, an electronic instrument measurement and control circuit measures current and voltage of the THR heating probe, also measures fluid temperature, namely fluid environmental temperature, of the PT1000 temperature sensor probe, and calculates the fluid flow through the temperature and power parameters measured by the THR heating probe.
Description
Technical field
The invention belongs to oil reservoir logging technical field, be specifically related to a kind of producing well downhole flow measurement new method based on thermodynamics thermal field conduct radiation principle, provide the new flowmeter based on the method simultaneously.
Background technology
When China oil field enters later development, the production profile in production logging field and the flow of injection profile are highly important parameters, it concerns the evaluation of zone production and injects the determination of well blot coat suction volume, but existing flow measurement technology existing defects all in various degree, specific as follows:
1, current production profile flow rate test mainly uses turbine flowmeter, owing to underground vibrating, high temperature and hole condition are complex, its success log ratio is low, low precision and start discharge capacity big;
2, the flow measurement of injection profile is currently mainly used the effusion meters such as ultrasonic flowmeter, electromagnetic flowmeter, vortex-shedding meter, wherein: ultrasonic flowmeter circuit probe is complicated, can not work under hot environment, and may be only available for the flow rate test of water injection well; Although electromagnetic flowmeter certainty of measurement is high, but its environmental suitability is poor, the dielectric constant injecting fluid is required, and this instrument price is relatively costly; Vortex-shedding meter is only applicable to the flow measurement of big flow water, gas, though circuit is simple but certainty of measurement is low.
At present temporarily without a kind of flow rate test technology that can be applicable to various fluid media (medium)s, certainty of measurement height and have higher success log ratio, to meet many-sided demand in all kinds of oil field.
Summary of the invention
It is an object of the invention to provide a kind of producing well downhole flow measurement method based on thermodynamics thermal field conduction principle, through theoretical derivation the functional relationship drawing fluid flow and heat passage through key hole scale, by asking for heated probe power and temperature, fluid environment temperature, obtains fluid flow.
For achieving the above object, the technical scheme that the present invention takes is as follows:
A kind of based on thermodynamic (al) effusion meter, described include based on thermodynamic (al) effusion meter:
Housing, housing be internally provided with the wire-passing tube running through housing, and be arranged on the THR heated probe in housing and PT1000 temperature sensor probe;
Described THR heated probe is arranged in housing one end, METAL HEATING PROCESS silk it is provided with in THR heated probe, electronics is accessed by wire, electronics telemetry circuit measures electric current and the voltage of THR heated probe, also measure the fluid temperature (F.T.) of PT1000 temperature sensor probe, the i.e. ambient temperature of fluid, and calculate fluid flow with the temperature of THR heated probe mensuration, power parameter.
Further, described THR heated probe is at least provided with one.
Further, described tinsel can use the one in tungsten filament, constantan wire or other B alloy wires to make THR heated probe.
Further, described housing Measurement channel is provided with water inlet and outlet.
Further, described electronics joint shell is connected with Measurement channel shell, and its junction is provided with sealing member.
Further, the junction that the upper end of described Measurement channel is instrument top connection, top connection and housing is provided with sealing member.
Further, described THR heated probe adopts general T HR heated probe, adapts to ambient temperature lower than 300 DEG C, will add hot wire filling with high-temperature heat-conductive silica gel and be coupled in pressure-bearing metal probe
Or adopt high-temperature T R heated probe, adapt to ambient temperature higher than 300 DEG C, with magnesium powder, tinsel filling is coupled in hydrostatic profile in pressure-bearing metal probe.
The invention provides a kind of based on thermodynamic (al) flow-measuring method, it is characterised in that include following steps:
(1) in downhole fluid, it is arranged to the PT1000 temperature sensor probe of detection fluid temperature (F.T.) T1 and THR heated probe, is used for detecting heated probe temperature T2;
(2) described PT1000 temperature sensor probe and THR heated probe are coupled access electronics, electronics is used for detecting PT1000 temperature sensor probe fluid temperature (F.T.) T1 and detection THR heated probe temperature T2, and control THR heated probe and control the lifting of temperature, and detect the power P of THR heated probe;
(3) constant power process is adopted: namely the excitation heating power of THR heated probe is carried out electric current, the collection of voltage swing and control by electronics, makes heating power P=I*V invariable, gathers and calculate the temperature T2 of THR heated probe; Then gather fluid environment temperature T1 again, obtain temperature difference T=T2-T1, finally calculate liquid mass flow Qm, Qm=f (�� T, P);
Or adopt constant difference method: namely electronics gathers the temperature T2 of THR heated probe, fluid environment temperature T1, calculating �� T=T2-T1, electronics, by regulating the size of the driving voltage V and exciting current I of THR heated probe, makes �� T be constant at certain temperature value, (such as �� T=55 DEG C), electronics collection heating probe voltage V, electric current I, and ask for power P=V*I, finally ask for the mass flow of fluid, Qm=f (P, �� T);
Or adopt free style method, namely electronics controls the heating of THR heating probe, gather its driving voltage V, electric current I, and calculate heating power P=V*I, then gather the temperature T2, fluid environment temperature T1 that calculate THR heated probe again, and calculate �� T=T2-T1, finally ask for the mass flow of fluid, Qm=f (�� T, P).
There is advantages that
1, instrument is simple and reliable, and high degree shortens tool length, the well logging construction of convenient scene.
2, the such environmental effects of other flow rate test method is eliminated, such as crude oil pollution, silt damping, hot environment etc.
3, wide accommodation, as gas, liquid can be applied.
4, certainty of measurement is high, it is wide to measure scope.
5, can to design external diameter according to user's request minimum up to 24mm for instrument external diameter.
Accompanying drawing explanation
Fig. 1 is this practicality invention structural representation based on thermodynamic (al) flowrate measuring tool;
Fig. 2 is this practicality invention another structural representation based on thermodynamic (al) flowrate measuring tool;
Fig. 3 is the schematic diagram of electronics circuit of the present invention.
Detailed description of the invention
Referring to Fig. 1 to Fig. 3, technical scheme is conducted further description.
Embodiment 1
Referring to figs. 1 through Fig. 3,
A kind of based on thermodynamic (al) effusion meter, described include based on thermodynamic (al) effusion meter:
Housing 1, housing 1 be internally provided with the wire-passing tube 8 running through housing, and be arranged on the THR heated probe 3 in housing and PT1000 temperature sensor probe 5;
Described THR heated probe 3 is arranged on one end in housing 1, it is provided with in THR heated probe 3 and adds hot wire 4, tinsel 4 accesses electronics by wire, electronics telemetry circuit measures heated probe electric current and voltage, PT1000 temperature sensor probe 5 is arranged in housing fluid Measurement channel, measure fluid environment temperature, and calculate fluid flow with the temperature of THR heating probe mensuration, power parameter.
In this embodiment, PT1000 temperature sensor probe 5 is arranged on housing 1 inside and THR heating probe 3 offside one end.
Further, described THR heated probe 3 is at least provided with one.
Further, described housing Measurement channel is provided with water inlet 2 and outlet 6.
Further, described electronics joint shell is connected with Measurement channel shell, and its junction is provided with sealing member 7.
Further, the upper end of described Measurement channel is instrument top connection 9, and the junction of top connection 9 and housing is provided with sealing member 10.
Further, described THR heated probe adopts general T HR heated probe, adapts to ambient temperature lower than 300 DEG C, will add hot wire filling with high-temperature heat-conductive silica gel and be coupled in pressure-bearing metal probe;
Or adopt high-temperature T R heated probe, adapt to ambient temperature higher than 300 DEG C, with magnesium powder, tinsel filling is coupled in hydrostatic profile in pressure-bearing metal probe.
A kind of based on thermodynamic (al) flow-measuring method, it is characterised in that to include following steps:
(1) in downhole fluid, it is arranged to the PT1000 temperature sensor probe 5 of detection fluid temperature (F.T.) T1 and THR heated probe 3, is used for detecting heated probe temperature T2;
(2) described PT1000 temperature sensor probe 5 and THR heated probe 3 are coupled access electronics 12, electronics 12 is used for detecting PT1000 temperature sensor probe 5 fluid temperature (F.T.) T1 and detection THR heated probe 3 temperature T2, and control THR heated probe 3 and control the lifting of temperature, and detect the power P of THR heated probe;
(3) constant power process is adopted: namely the excitation heating power of THR heating probe 3 is carried out electric current, the collection of voltage swing and control by electronics 12, makes heating power P=I*V invariable, gathers and calculate the temperature T2 of THR heated probe 3; Then gather fluid environment temperature T1 again, obtain temperature difference T=T2-T1, finally calculate liquid mass flow Qm, be i.e. Qm=f (�� T, P);
Or adopt constant difference method: namely electronics 12 gathers the temperature T2 of THR heated probe 3, the fluid temperature (F.T.) T1 of PT1000 temperature sensor probe 5, calculate �� T=T2-T1, electronics 12 is by regulating the size of the driving voltage V and exciting current I of THR heated probe 3, �� T is made to be constant at certain temperature value, (such as �� T=55 DEG C), electronics 12 gathers heated probe voltage V, electric current I, and ask for P=V*I, finally ask for the mass flow Qm of fluid, i.e. Qm=f (P, �� T);
Or adopt free style method, namely electronics 12 controls the heating of THR heated probe 3, gather its driving voltage V, electric current I, and calculate heating power P=V*I, then gather the temperature T2, fluid temperature (F.T.) T1 that calculate THR heated probe 3 again, and calculate �� T=T2-T1, finally ask for the mass flow Qm of fluid, i.e. Qm=f (�� T, P).
Embodiment 2
With reference to Fig. 2 and Fig. 3
A kind of based on thermodynamic (al) effusion meter, described include based on thermodynamic (al) effusion meter:
Housing 1, is arranged on the THR heated probe 3 in housing 1 and PT1000 temperature sensor probe 5;
Described THR heated probe 3 is arranged on one end in housing 1, the one in tungsten filament, constantan wire or other B alloy wires it is provided with in THR heated probe 3, tungsten filament, constantan wire or other B alloy wires access electronics joint by wire, and measure electric current and voltage by coupling circuit with electronics joint, PT1000 temperature sensor probe 5 is arranged in housing fluid Measurement channel, to measure the ambient temperature of fluid, and calculate fluid flow with the temperature of THR heated probe mensuration, power parameter.
In this embodiment, PT1000 temperature sensor probe 5 is arranged on housing 1 inside and THR heated probe 3 homonymy.
Further, described THR heated probe 3 is at least provided with one.
Further, described housing Measurement channel is provided with water inlet 2 and outlet 6.
Further, described electronics joint shell is connected with Measurement channel shell, and its junction is provided with sealing member 7.
Further, the upper end of described Measurement channel is instrument top connection 9, and the junction of top connection 9 and housing is provided with sealing member 10.
Further, described THR heated probe adopts general T HR heated probe, adapts to ambient temperature lower than 300 DEG C, will add hot wire filling with high-temperature heat-conductive silica gel and be coupled in pressure-bearing metal probe.
Adopt high-temperature T R heated probe, adapt to ambient temperature higher than 300 DEG C, with magnesium powder, tinsel filling is coupled in hydrostatic profile in pressure-bearing metal probe.
A kind of based on thermodynamic (al) flow-measuring method, it is characterised in that to include following steps:
(1) in downhole fluid, it is arranged to the PT1000 temperature sensor probe 5 of detection fluid temperature (F.T.) T1 and THR heated probe 3, is used for detecting heated probe temperature T2;
(2) described PT1000 temperature sensor probe 5 and THR heated probe 3 are coupled access electronics 12, electronics 12 is used for detecting PT1000 temperature sensor probe 5 fluid temperature (F.T.) T1 and detection THR heated probe 3 temperature T2, and control THR heated probe 3 and control the lifting of temperature, and detect the power P of THR heated probe;
(3) constant power process is adopted: namely the excitation heating power of THR heated probe 3 is carried out electric current, the collection of voltage swing and control by electronics 12, makes heating power P=I*V invariable, gathers and calculate the temperature T2 of THR heated probe 3; Then gather fluid environment temperature T1 again, obtain temperature difference T=T2-T1, finally calculate liquid mass flow Qm, be i.e. Qm=f (�� T, P);
Or adopt constant difference method: namely electronics 12 gathers the temperature T2 of THR heated probe 3, flow temperature T1, calculating �� T=T2-T1, electronics 12, by regulating the size of the driving voltage V and exciting current I of THR heated probe 3, makes �� T be constant at certain temperature value, (such as �� T=55 DEG C), electronics 12 gathers heated probe voltage V, electric current I, and asks for P=V*I, finally asks for the mass flow Qm of fluid, i.e. Qm=f (P, �� T);
Or adopt free style method, namely electronics 12 controls the heating of THR heated probe 3, gather its driving voltage V, electric current I, and calculate heating power P=V*I, then gather the temperature T2, fluid temperature (F.T.) T1 that calculate THR heated probe 3 again, and calculate �� T=T2-T1, finally ask for the mass flow Qm of fluid, i.e. Qm=f (�� T, P).
Claims (8)
1. based on a thermodynamic (al) effusion meter, it is characterized in that, described include based on thermodynamic (al) effusion meter:
Housing, housing be internally provided with the wire-passing tube running through housing, and be arranged on the THR heated probe in housing and PT1000 temperature sensor probe;
Described THR heated probe is arranged in housing one end, it is provided with metal platinum in THR heated probe, metal platinum accesses electronics joint by wire, and measure electric current and voltage by coupling circuit with electronics joint, PT1000 temperature sensor probe is arranged in housing fluid Measurement channel, to measure the ambient temperature of fluid, and calculate fluid flow with the temperature of THR heated probe mensuration, power parameter.
2. one according to claim 1 is based on thermodynamic (al) effusion meter, it is characterized in that, described THR heated probe is at least provided with one.
3. one according to claim 1 is based on thermodynamic (al) effusion meter, it is characterized in that, described metal platinum can use the one in tungsten filament, constantan wire or other B alloy wires as TPR heated probe.
4. one according to claim 1 is based on thermodynamic (al) effusion meter, it is characterized in that, described housing Measurement channel is provided with water inlet and outlet.
5. one according to claim 1 is based on thermodynamic (al) effusion meter, it is characterized in that, described electronics joint shell is connected with Measurement channel shell, and its junction is provided with sealing member.
6. one according to claim 1 is based on thermodynamic (al) effusion meter, it is characterized in that, the junction that the upper end of described Measurement channel is instrument top connection, top connection and housing is provided with sealing member.
7. one according to claim 1 is based on thermodynamic (al) effusion meter, it is characterized in that, described THR heated probe adopts general T HR heated probe, adapts to ambient temperature lower than 300 DEG C, will add hot wire filling with high-temperature heat-conductive silica gel and be coupled in pressure-bearing metal probe;
Or adopt high-temperature T R heated probe, adapt to ambient temperature higher than 300 DEG C, with magnesium powder, tinsel filling is coupled in hydrostatic profile in pressure-bearing metal probe.
8. one kind based on thermodynamic (al) flow-measuring method, it is characterised in that include following steps:
(1) in downhole fluid, it is arranged to the PT1000 temperature sensor probe of detection fluid temperature (F.T.) T1 and THR heated probe, is used for detecting heated probe temperature T2;
(2) described PT1000 temperature sensor probe and THR heated probe are coupled access electronics, electronics is used for detecting PT1000 temperature sensor probe fluid temperature (F.T.) T1 and detection THR heated probe temperature T2, and control THR heated probe and control the lifting of temperature, and detect the power P of THR heated probe;
(3) constant power process is adopted: namely the excitation heating power of THR heated probe is carried out electric current, the collection of voltage swing and control by electronics, makes heating power P=I*V invariable, gathers and calculate the temperature T2 of THR heated probe; Then gather fluid environment temperature T1 again, obtain temperature difference T=T2-T1, finally calculate liquid mass flow Qm, be i.e. Qm=f (�� T, P);
Or adopt constant difference method: namely electronics gathers the temperature T2 of THR heated probe, flow temperature T1, calculating �� T=T2-T1, electronics, by regulating the size of the driving voltage V and exciting current I of THR heated probe, makes �� T be constant at certain temperature value, (such as �� T=35 DEG C), electronics gathers heated probe voltage V, electric current I, and asks for P=V*I, finally asks for the mass flow Qm of fluid, i.e. Qm=f (P, �� T);
Or adopt free style method, namely electronics controls the heating of THR heated probe, gather its driving voltage V, electric current I, and calculate heating power P=V*I, then gather the temperature T2, fluid temperature (F.T.) T1 that calculate THR heated probe again, and calculate �� T=T2-T1, finally ask for the mass flow Qm of fluid, i.e. Qm=f (�� T, P).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610087498.9A CN105628118A (en) | 2016-02-16 | 2016-02-16 | Thermodynamics-based flow meter and thermodynamics-based flow measuring method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109000745A (en) * | 2017-06-06 | 2018-12-14 | 大唐环境产业集团股份有限公司 | It is a kind of for measuring the device and measurement method of wet desulfuration tower slurries spraying intensity |
| US20190041248A1 (en) * | 2017-08-02 | 2019-02-07 | Azbil Corporation | Thermal flowmeter |
| CN109506730A (en) * | 2017-09-15 | 2019-03-22 | 阿自倍尔株式会社 | Thermal flowmeter |
| CN109781199A (en) * | 2018-12-21 | 2019-05-21 | 中国石油天然气集团有限公司 | A kind of high-precision low discharge detection device based on firm power |
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| CN101221060A (en) * | 2007-12-28 | 2008-07-16 | 当代天启技术（北京）有限公司 | Thermal dissipation type mass flowmeter and method for measuring mass flux |
| CN205898220U (en) * | 2016-02-16 | 2017-01-18 | 陕西华晨石油科技有限公司 | Flowmeter based on thermodynamics |
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2016
- 2016-02-16 CN CN201610087498.9A patent/CN105628118A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101221060A (en) * | 2007-12-28 | 2008-07-16 | 当代天启技术（北京）有限公司 | Thermal dissipation type mass flowmeter and method for measuring mass flux |
| CN205898220U (en) * | 2016-02-16 | 2017-01-18 | 陕西华晨石油科技有限公司 | Flowmeter based on thermodynamics |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109000745A (en) * | 2017-06-06 | 2018-12-14 | 大唐环境产业集团股份有限公司 | It is a kind of for measuring the device and measurement method of wet desulfuration tower slurries spraying intensity |
| CN109000745B (en) * | 2017-06-06 | 2023-11-24 | 大唐环境产业集团股份有限公司 | Device and method for measuring slurry spraying strength of wet desulfurization tower |
| US20190041248A1 (en) * | 2017-08-02 | 2019-02-07 | Azbil Corporation | Thermal flowmeter |
| CN109506730A (en) * | 2017-09-15 | 2019-03-22 | 阿自倍尔株式会社 | Thermal flowmeter |
| US10788346B2 (en) | 2017-09-15 | 2020-09-29 | Azbil Corporation | Thermal type flowmeter using quadratic function of logarithm of flow rate |
| CN109506730B (en) * | 2017-09-15 | 2020-12-22 | 阿自倍尔株式会社 | Thermal flowmeter |
| CN109781199A (en) * | 2018-12-21 | 2019-05-21 | 中国石油天然气集团有限公司 | A kind of high-precision low discharge detection device based on firm power |
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