CN1279370C - Method and apparatus for measuring characteristic for fluid in downhole well casing based on nuclear magnetic resonance - Google Patents
Method and apparatus for measuring characteristic for fluid in downhole well casing based on nuclear magnetic resonance Download PDFInfo
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- CN1279370C CN1279370C CN 03146509 CN03146509A CN1279370C CN 1279370 C CN1279370 C CN 1279370C CN 03146509 CN03146509 CN 03146509 CN 03146509 A CN03146509 A CN 03146509A CN 1279370 C CN1279370 C CN 1279370C
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Abstract
The present invention relates to a method for measuring fluid characteristics in underground sleeve pipes based on nuclear magnetic resonance. The peripheral magnetic field intensity of a detector is set as zero, and a stable static magnetic field B0 is established in an inner cavity of the detector; an alternating electromagnetic field B1 is added in a direction perpendicular to the static magnetic field B0, and the frequency of the alternating electromagnetic field B1 is the same with the precession frequency of hydrogen nucleus in the static magnetic field. The detector is positioned in an underground sleeve pipe to make fluid flow through a through hole in the center of the detector for measuring the longitudinal relaxation time of the fluid in the sleeve pipe, and the distribution of the longitudinal relaxation time can be obtained by inverting measured data to further determine the longitudinal relaxation time and relative contents of oil, gas and water; in this way, the maintenance and the viscosity of the oil, the gas and the water can be worked out. The present invention has the advantages of convenient and rapid measurement and has no limitation from the magnitude of well gradient, the flow speed of the fluid in a well and the distribution state of mixed fluid in the well, and practical measured values are closed to theoretical values. The present invention not only can carry out fixed-point measurement, but also carry out continuous measurement; the present invention can be used for observing fluid characteristics for metal sleeve pipes under a downhole condition and general pipe flow or chemical processing processes in real time.
Description
Technical field
The present invention relates to a kind of detector and detection system of measuring fluid behaviour, especially a kind of in down-hole casing or general Guan Liuzhong, measure the detector and the detection system of fluid holdup and viscosity, belong to oil well logging, chemical process and industrial control technology field.
Background technology
Holdup and viscosity are the important characterising parameters of pipe stream.Holdup is called area content in fluid mechanics, its physical significance is on the expression heterogeneous fluid mixed flow cross section, the relative scale that each phase fluid is shared separately.Holdup is called volume fraction on the spot again, can represent the relative volume size of in esse each phase fluid in a certain position of flow duct.For the sleeve pipe with definite size, if the pipe inner volume on the unit length is regarded as a unit, the holdup of a certain phase can be counted as this saturation degree in sleeve pipe in this unit volume so.Viscosity is defined as in the fluid ratio of the shear stress of unit area and velocity gradient on any point, it is fluid, comprise gas or internal fluid friction and the resistance that causes, therefore, the viscosity of fluid is inner certain part of fluid the measuring of frictional resistance when mobile with respect to another part.The size of fluid viscosity is an important parameters very for its mobile calculating in the stratum or in the pipeline, and the height of viscosity shows the difficulty or ease that fluid flows, and viscosity is big more, and resistance to flow is big more, difficult more flowing.
At present, in the oil gas field well logging, also under downhole condition, do not measure the method for fluid viscosity.The measuring method of in-hole fluid holdup mainly contains densimetry and capacitance method.The method of measuring fluid density comprises gradiomanometer tool well logging and the well logging of gamma densitometer; The electric capacity water cut meter can be divided into annular space formula capacitance method water cut meter and sampling formula capacitance method water cut meter by the metering system of its sensor.Below existing measuring technique is once simply introduced:
1, gradiomanometer tool
Gradiomanometer tool claims the density gradient meter again, utilizes two pressure-sensitive corrugated tubes at a distance of 2ft, measures the pressure difference value of corresponding spacing in the pit shaft.This pressure difference value is main relevant with the gravity gradient of fluid, and is subjected to fluid dynamic gradient that flows and the influence of grinding the resistance gradient.At present, utilize the gradiomanometer tool well logging to have two difficult problems: one, the gradiomanometer tool well logging need be carried out accurate instrument calibration and strict quality.Its two, under and the situation that flow velocity is very high big, particularly in horizontal well, can't accurately ask for the volume density of fluid by proofreading and correct influence that hole deviation and mill hinder in hole deviation.
2, gamma densitometer
The gamma fluid density meter claims the radioactive fluid densitometer again, utilizes fluid that the absorption characteristic of gamma rays is measured fluid density.When the narrow beam gamma rays passes material, with material generation photoelectric effect, Compton effect and pair effect.The gamma fluid density meter is to utilize to place the gamma source ray of oil duct and the fluid generation Compton effect of passing runner, utilizes counter measures to write down reacted gamma ray intensity simultaneously.Obtain the volume density of fluid then according to its attenuation characteristic.The gamma fluid density meter is measured between two parties by centralizer, during measurement, needs the restriction logging speed, to avoid the influence of timeconstant.Because the lightweight phase fluid trends towards in the pipeline central flows, log value may have certain difference with in esse average fluid density in the pipe; And all there is the shortcoming that itself is difficult to overcome in radioactivity well logging, and promptly measurement result is subjected to the influence of statistical error, and therefore, the measuring accuracy of gamma fluid density meter is lower, is about 0.01g/cm
3
3, annular space formula capacitance method water cut meter
Annular space formula capacitance method water cut meter is by the column capacitance probe, utilizes fluid as the dielectric medium measurement water holdup.The suitable sectional area of design can not change original flow state when fluid is passed through in the annular space between sensor insulation course and external electrode (tool housing).Instrument is with the part of interior cylinder as oscillating circuit, and the concussion frequency is the function of annular space fluid specific inductive capacity, measures the also frequency response of register instrument, obtains the water holdup in shaft bottom then indirectly.Theoretical analysis, experimental study and practical application show, annular space formula capacitance method water holdup is in respect of 2 deficiencies: the one, and it is non-linear to measure response; The 2nd, the resolution characteristic of instrument is relevant with the state that fluid-mixing distributes, that is influenced by flow pattern.The advantage that annular space formula capacitance method water cut meter is used is the distribution of " Water-In-Oil ", because the Water-In-Oil state may last till Y sometimes
WBe about about 60%, so be limited to Y on the water holdup that apparatus measures may be discerned
W=60%, but its measurement reliably is at Y
WUnder the situation of ∠ 30%.
4, sampling formula electric capacity water cut meter
Sampling formula electric capacity water cut meter, its structure still is a columnar capacitor, just a ball valve and ball-and-seat have been added respectively at inlet and liquid outlet, adopt the diode pumping circuit that sampling hut's total capacitance is converted to potential difference (PD) value record and output, the plate of setting up according to experiment that concerns is converted to the water holdup value with log reading then.Facts have proved, though the resolution characteristic of sampling formula electric capacity water cut meter convection cell water holdup increases, but produced some new problems again: the one, be difficult in probe realize that oil, water separate fully, measuring speed is slower, and actual measurement deviates from easily mutually with theoretical foundation and experiment scale; The 2nd, be difficult to the relative scale of the in esse water of accurate measuring well intraocular; The 3rd, sampling formula electric capacity water cut meter can only one-point measurement, can't continuous coverage.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, a kind of detector and detection system based on Nuclear Magnetic Resonance Measurement down-hole casing inner fluid characteristic is provided, and it is convenient to measure, less demanding to the degree of accuracy of surveying instrument scale, do not require strict quality, measure faster.
Another purpose of the present invention is at the deficiencies in the prior art, and a kind of detector and detection system based on Nuclear Magnetic Resonance Measurement down-hole casing inner fluid characteristic is provided, and is not subjected to the restriction of fluid-mixing distribution in hole deviation degree size, in-hole fluid flow velocity and the well.
A further object of the present invention is at the deficiencies in the prior art, a kind of detector and detection system based on Nuclear Magnetic Resonance Measurement down-hole casing inner fluid characteristic is provided, actual measured value and theoretical value are more approaching, and not only can one-point measurement, can also realize continuous coverage, realize in downhole condition or the ground chiral process real-time monitored of fluid behaviour.
The objective of the invention is to be achieved through the following technical solutions:
A kind of method based on Nuclear Magnetic Resonance Measurement down-hole casing inner fluid characteristic, this method comprises:
Step 1: make fluid enter polarizing magnetic field and polarize;
Step 2: the fluid after the polarization is applied alternating electromagnetic field, form resonant field, make it produce nuclear magnetic resonance;
Step 3: gather described NMR signal, that is: longitudinal relaxation time (T1), and according to the incidence relation of longitudinal relaxation time and fluid behaviour it is handled, obtain fluid property data.
Alternating electromagnetic field in the step 2 is perpendicular to one another with the direction of resonant field.
Incidence relation in the step 3 comprises:
By η 1=5 * 10
-8T/D asks for the viscosities il 1 of fluid, and wherein, D is a coefficient of diffusion, and its numerical value is constant, and T is the measurement temperature of fluid;
Perhaps by η 2=9.6 * 10
-3T/T1 asks for viscosity of crude η 2, and T is the measurement temperature of fluid;
Perhaps by ρ=T1 * T
1.5/ 1.57 * 10
5, asking for natural gas density ρ, T is the measurement temperature of fluid;
Perhaps by T1/D=2 * 10
5/ f (GOR) asks for gas/oil ratio value; Wherein, the concrete funtcional relationship of f (GOR) is determined by the experiment chart board.
Perhaps by HI=ρ * 9R/ (12+R), ask for hydrogen index HI, ρ is a natural gas density, is determined by aforementioned calculation.R is a H:C ratio, i.e. the hydrogen-carbon ratio value.
A kind of detector that adopts said method measuring unit tube fluid characteristic, this detector is formed by magnet, coil with the housing of its integral coating, the detector center offers the through hole that flows through for fluid, the hole wall of through hole is a non-magnet material, magnet is located in the space that housing and through-hole wall enclose, and sets up at the detector central through hole and stablizes static magnetic field (B
0), this magnetic field (B
0) will form polarized area by the fluid polarization of through hole; Coil is embedded between magnet and central through hole, and it is provided with the first half that the position is positioned at detector, and coil comprises transmitting coil and receiving coil, and transmitting coil links to each other with receiver with the transmitter of outside respectively with receiving coil, and transmitting coil is being stablized static magnetic field (B
0) direction on apply an alternating electromagnetic field (B
1), its frequency is identical with nuclear precession frequency in the static magnetic field, makes the fluid that flows through from central through hole produce nuclear magnetic resonance, forms resonance region.Alternating electromagnetic field (B
1) and stabilizing magnetic field (B
0) direction be perpendicular to one another.
Detector inside, the magnetic field in polairzed area and the resonance zone evenly distributes, and the inner space that the housing and the central through hole wall of detector enclosed is five equilibrium vertically, and the N utmost point of magnet and the S utmost point are filled in respectively in the two five equilibrium spaces of detector inside.
Transmitting coil and receiving coil twine in the same way, and the length of transmitting coil is longer than receiving coil, and make each echo in the CPMG spin echo string that receiving coil gathers come from the fluid of equal volume.
For guarantee detector can be in down-hole casing upper and lower moving freely, the magnetic field intensity of detector housing outside is zero.
A kind of detection system that adopts above-mentioned detector measurement cover tube fluid characteristic, it comprises transmitter, detector, receiver and data acquisition storer, transmitter transmits a signal to detector, make fluid produce nuclear magnetic resonance by detector, the signal that the detection amount obtains behind the detector fluid generation nuclear magnetic resonance sends to receiver, receiver links to each other with the data acquisition storer, receiver becomes data to send to the data acquisition memory stores conversion of signals that measures, and gathers NMR signal and processing.
Measurement data is measured the longitudinal relaxation time of fluid in the sleeve pipe for adopting the saturation recovery method.
Measurement data rests on the one-point measurement of a certain fixed position of pipe well inside by detector, and it is resultant perhaps detector to be carried out carrying out continuous coverage with the state that certain speed moves in pipe well.
In sum, the present invention has following characteristics:
1, measure conveniently, less demanding to the degree of accuracy of surveying instrument scale, do not require strict quality, measure faster.
2, be not subjected to the restriction of fluid-mixing distribution in hole deviation degree size, in-hole fluid flow velocity and the well.
3, actual measured value and theoretical value are more approaching, and not only can one-point measurement, can also realize continuous coverage, realize in downhole condition or the ground chiral process real-time monitored of fluid behaviour.
Description of drawings
Fig. 1 is the basic comprising synoptic diagram of existing Nuclear Magnetic Resonance Measurement device;
Fig. 2 is the longitudinal profile structural representation of detector of the present invention;
Fig. 3 is the cross-sectional structure synoptic diagram of detector resonance region of the present invention;
Fig. 4 is the cross-sectional structure synoptic diagram of detector polarized area of the present invention;
Fig. 5 is a NMR measuring system structural representation of the present invention;
Fig. 6 is the water cut of NMR measurement of the present invention and the graph of a relation of the actual water cut of crude oil;
The measurement result comparison diagram of T1 when Fig. 7 is one-point measurement of the present invention and traverse measurement.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is described in detail.
As shown in Figure 1, basic comprising synoptic diagram for existing Nuclear Magnetic Resonance Measurement device, as can be seen from Figure 1, conventional nuclear magnetic resonance (NMR) device is made of its annexation such as Fig. 1 magnet 1, coil 2, pulse train transmitter 3, NMR signal receiver 4, data acquisition and memory storage 5.Nuclear magnetic resonance was many in the application of medical domain in the past, and it is less in the application in oil well logging, chemical process and industrial control technology field, the principle of work and relevant detailed description used in this field, all disclose to some extent in " Magnetic resonance imaging well logging and rock NMR and application thereof " book of publishing in 1998 in Science Press, this book author is Xiao Lizhi.
The ultimate principle of nuclear magnetic resonance is: magnet produces static magnetic field B
0, the atomic nucleus in the magnetic field is magnetized, nuclear-magnetism is apart from precession in static magnetic field, and frequency is ω=γ B
0Transmitting coil emission one and B
0Vertical alternating electromagnetic field B
1, work as B
1Frequency when equating with the precession frequency of nuclear-magnetism distance, just produce nuclear magnetic resonance, can observe NMR signal.Specifically, utilizing the nuclear magnetic resonance fluid properties to measure, mainly is to set up incidence relation between MNR (nuclear magnetic resonance) characteristic and fluid behaviour.Former study shows between NMR characteristic and the fluid characterization parameter, good correlativity is arranged, and its concrete transformational relation is as shown in the table.
Table 1:
| The MNR characteristic | Fluid behaviour | Transformational relation |
| Diffusion coefficient D (constant) | Viscosities il | η＝5×10 -8T/D (T is a temperature) |
| Longitudinal relaxation time T1 | Viscosity of crude η | η＝9.6×10 -3T/T1 (T is a temperature) |
| Longitudinal relaxation time T1 | Natural gas density ρ | ρ＝T1×T 1.5/1.57×10 5 |
| D&T1 | Gas/oil ratio value | T1/D＝2×10 5/f(GOR) |
| Hydrogen index HI | Density p, the H:C ratio R | HI＝ρ×9R/(12+R) |
According to listed NMR characteristic of last table and the transformational relation between the fluid characterization parameter, the proving installation by nuclear magnetic resonance utilizes above-mentioned conversion formula with longitudinal relaxation time T1 survey record, can derive corresponding fluid behaviour parameter.
The nuclear magnetic resonance device of observation fluid behaviour in the sleeve pipe of the present invention, its core component is a detector, as shown in Figure 2, is the longitudinal profile structural representation of detector of the present invention.As can be seen from Figure 2, detector is formed by magnet 20, coil 30 with the housing 10 of its integral coating, the detector center offers the through hole 40 that flows through for fluid, the hole wall of through hole 40 is a non-magnet material, magnet 20 is located in the space that housing 10 and through hole 40 walls are enclosed, and sets up at detector central through hole 40 and stablizes static magnetic field B
0, this magnetic field B
0To form polarized area 200 by the fluid polarization of through hole 40; Coil 30 is embedded between magnet 20 and central through hole 40, it is provided with the first half that the position is positioned at detector, described coil 30 comprises transmitting coil 302 and receiving coil 301, transmitting coil 302 links to each other with receiver with the transmitter of outside respectively with receiving coil 301, and transmitting coil 302 is being stablized static magnetic field B
0Direction on apply an alternating electromagnetic field B
1, its frequency is identical with nuclear precession frequency in the static magnetic field, makes the fluid that flows through from central through hole 40 produce nuclear magnetic resonance, forms resonance region 100; Alternating electromagnetic field B
1With stabilizing magnetic field B
0Direction be perpendicular to one another.
Detector inside, the magnetic fields in polairzed area 200 and the resonance zone 100 evenly distribute, and the inner space that the housing 10 and central through hole 40 walls of detector are enclosed is five equilibrium vertically, and the N utmost point of magnet and the S utmost point are filled in respectively in the two five equilibrium spaces of detector inside.
Transmitting coil 302 and receiving coil 301 twine in the same way, and the length of transmitting coil 302 is than long one times of receiving coil 301, and each echo comes from the fluid of equal volume in the CPMG that receiving coil 301 is gathered (name abbreviation) the spin echo string.
The magnetic field intensity of detector housing 10 outsides is zero, make detector can be in down-hole casing upper and lower moving freely.
As shown in Figure 3, Figure 4, be respectively the cross-sectional structure synoptic diagram of detector resonance region of the present invention, polarized area.From figure, can understand the structural relation between resonance zone 100 and polairzed area 200 internal magnets 20, coil 30, housing 10 and the through hole 40.
As shown in Figure 5, be NMR measuring system structural representation of the present invention, it comprises transmitter 3, detector 6, receiver 4 and data acquisition storer 5, transmitter 3 transmits a signal to detector 6, make fluid produce nuclear magnetic resonance by detector 6, the signal that the detection amount obtains behind the detector 6 fluids generation nuclear magnetic resonance sends to receiver 4, receiver 4 links to each other with data acquisition storer 5, receiver 4 becomes data to send to 5 storages of data acquisition storer the conversion of signals that measures, and gathers NMR signal and processing.
Measurement data is measured the longitudinal relaxation time of fluid in the sleeve pipe for adopting the saturation recovery method.
Measurement data be by detector rest on pipe well inside a certain fixed position one-point measurement or that detector is carried out carrying out continuous coverage with the state that certain speed moves in pipe well is resulting.
Concrete measuring process is such: detector 6 is placed down-hole casing, and the peripheral magnetic field intensity of detector 6 is zero, thereby can place metal sleeve to measure at an easy rate.Set up a stable static magnetic field B at detector 6 inner chambers
0, when fluid passed therein, the proton in the fluid was subjected to B
0Effect and be magnetized, and with frequency (ω
0=γ B
0) precession.Add an alternating electromagnetic field B again in direction perpendicular to static magnetic field
1, and allow its frequency (ω=ω
0), the nuclear spin system will produce nuclear magnetic resonance.With pulse train definitely, can realize that the relaxation behavior of convection cell is measured.
Adopt the nuclear magnetic resonance device of observation fluid behaviour in the sleeve pipe provided by the present invention, measure the longitudinal relaxation time T1 of fluid in the sleeve pipe, utilize the transformational relation between NMR characteristic and the fluid characterization parameter then, ask for the holdup and the viscosity of fluid.In the measuring process, adopt the saturation recovery method, the longitudinal relaxation process of convection cell is observed.This method is the mature technology in the existing nuclear magnetic resonance field.Write down the longitudinal relaxation recovery curve, and recovery curve is carried out the multi index option match, obtain T
1Distribute, definite by to oil, gas, each phase position of water asks for each phase T
1Corresponding area coverage, thus ask for the phase holdup of oil, gas, water.By oil, the longitudinal relaxation time of water and the quantitative relationship of viscosity, determine the viscosity of oil and water.By the longitudinal relaxation time of rock gas, calculate its density and hydrogen index.So far, the parameter of description fluid behaviour just can both obtain.
Measurement data be by detector rest on pipe well inside a certain fixed position one-point measurement or that detector is carried out carrying out continuous coverage with the state that certain speed moves in pipe well is resulting.
Moisture method for determination of amount is such in the fluid: when fluid is flowed through detector, measure the longitudinal relaxation signal by the saturation recovery method, handle through multi index option again, obtain longitudinal relaxation time T1 and distribute, obtain T1 and area under spectrum size thereof oily and water during T1 distributes again.If the area under spectrum of water is Sw, the area under spectrum of oil is So, and so, water cut is: Hw=Sw/ (Sw+So).
Relation of measuring method, NMR T1 distribution water cut and the actual water cut of NMR longitudinal relaxation process under the flow state etc. has been carried out experimental observation.The result shows, the measurement of NMR longitudinal relaxation time is fully feasible under the flow state, the water cut and the actual water cut that are obtained by NMR T1 have good correlativity, as Fig. 6, shown in Figure 7, the measurement result comparison diagram of T1 when being respectively the graph of a relation of water cut that NMR of the present invention measures and the actual water cut of crude oil and one-point measurement of the present invention and traverse measurement.
Fig. 6 has provided the water cut of NMR T1 measurement and the relation of the actual water cut of T2, and both meet when water cut is low very much, have proved absolutely the accuracy of this measurement device.
Fig. 7 has contrasted the NMR longitudinal relaxation of stationary state and flow state and has measured, and is under the condition of 1 liter of per second at flow velocity, and both saturation recovery curve TW distribute and overlap fully, shown in Fig. 7 a; Stationary state and flow state T1 distribute and also overlap fully, shown in Fig. 7 b.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (4)
1, a kind of detector of measuring well running casing inner fluid characteristic, it is characterized in that: this detector is formed by magnet, coil with the housing of its integral coating, the detector center offers the through hole that flows through for fluid, the hole wall of through hole is a non-magnet material, magnet is located in the space that housing and through-hole wall enclose, and sets up at the detector central through hole and stablizes static magnetic field B
0, this magnetic field B
0To form polarized area by the fluid polarization of through hole; Coil is embedded between magnet and central through hole, and it is provided with the first half that the position is positioned at detector, and coil comprises transmitting coil and receiving coil, and transmitting coil links to each other with receiver with the transmitter of outside respectively with receiving coil, and transmitting coil is being stablized static magnetic field B
0Direction on apply an alternating electromagnetic field B
1, its frequency is identical with nuclear precession frequency in the static magnetic field, makes the fluid that flows through from central through hole produce nuclear magnetic resonance, forms resonance region;
Described detector inside, the magnetic field in polairzed area and the resonance zone evenly distributes, and the inner space that the housing and the central through hole wall of detector enclosed is five equilibrium vertically, and the N utmost point of magnet and the S utmost point are filled in respectively in the two five equilibrium spaces of detector inside;
Described transmitting coil and receiving coil twine in the same way, and the length of transmitting coil is longer than receiving coil, and make each echo in the CPMG spin echo string that receiving coil gathers come from the fluid of equal volume;
The magnetic field intensity of described detector housing outside is zero, make detector can be in down-hole casing upper and lower moving freely.
2, the detector of measuring well running casing inner fluid characteristic according to claim 1 is characterized in that: described alternating electromagnetic field B
1With stable static magnetic field B
0Direction be perpendicular to one another.
3, a kind of detection system that adopts the detector of claim 1 or 2 described measuring well running casing inner fluid characteristics, it is characterized in that: it comprises transmitter, detector, receiver and data acquisition storer, transmitter transmits a signal to detector, make fluid produce nuclear magnetic resonance by detector, the signal that the detection amount obtains behind the detector fluid generation nuclear magnetic resonance sends to receiver, receiver links to each other with the data acquisition storer, receiver becomes data to send to the data acquisition memory stores conversion of signals that measures, and gathers NMR signal and processing.
4, detection system according to claim 3 is characterized in that: described measurement data is measured the longitudinal relaxation time of fluid in the sleeve pipe for adopting the saturation recovery method.
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| CN 03146509 CN1279370C (en) | 2003-07-03 | 2003-07-03 | Method and apparatus for measuring characteristic for fluid in downhole well casing based on nuclear magnetic resonance |
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|---|---|---|---|
| CN 03146509 CN1279370C (en) | 2003-07-03 | 2003-07-03 | Method and apparatus for measuring characteristic for fluid in downhole well casing based on nuclear magnetic resonance |
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| CN1279370C true CN1279370C (en) | 2006-10-11 |
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| US7663363B2 (en) * | 2004-02-09 | 2010-02-16 | Baker Hughes Incorporated | Method and apparatus for high signal-to-noise ratio NMR well logging |
| US7994777B2 (en) * | 2007-09-28 | 2011-08-09 | Rockwell Automation Technologies, Inc. | Apparatus and methods for an inductive proximity sensor |
| US7683613B2 (en) * | 2007-11-19 | 2010-03-23 | Schlumberger Technology Corporation | High pressure/high temperature magnetic resonance tool |
| CN102444400B (en) * | 2011-11-15 | 2015-03-11 | 中国石油大学(北京) | Nuclear magnetic resonance fluid analyzer probe and nuclear magnetic resonance fluid analyzer |
| CN102518434B (en) * | 2011-12-09 | 2014-10-22 | 中国石油大学(北京) | Micro-detection probe for nuclear magnetic resonance analysis of fluid |
| CN103470238B (en) * | 2013-09-10 | 2016-02-03 | 中国石油天然气集团公司 | Clamping device and rock core sleeve |
| CN103776490B (en) * | 2014-01-13 | 2016-03-02 | 大连理工大学 | The MR imaging method of a kind of porous medium fluid velocity inside and temperature synchro measure |
| DE102015005300A1 (en) * | 2014-11-27 | 2016-06-02 | Krohne Ag | Method of operating a nuclear magnetic flowmeter |
| CN105738396A (en) * | 2014-12-12 | 2016-07-06 | 中国科学院大连化学物理研究所 | Detection method for oil content and water content in walnuts |
| CN105352847B (en) * | 2015-09-28 | 2018-11-02 | 中国石油大学(北京) | Viscosity of crude method for fast measuring |
| DE102015226179A1 (en) * | 2015-12-21 | 2017-06-22 | Robert Bosch Gmbh | Use of a meter to examine fuel, oil and / or hydraulic fluid |
| CN105781525B (en) * | 2016-03-16 | 2018-12-04 | 西南石油大学 | A kind of monitoring method for simulating shale gas horizontal cementing annular space replacement efficiency |
| CN107831094B (en) * | 2017-10-30 | 2020-04-07 | 中国人民解放军国防科技大学 | Method for measuring gas diffusion constant based on change of relaxation rate of alkali metal atom |
| CN107942398B (en) * | 2017-11-07 | 2020-05-08 | 中国石油天然气股份有限公司 | Method and device for determining flow velocity of multiphase fluid |
| US11327000B2 (en) * | 2018-05-21 | 2022-05-10 | Saudi Arabian Oil Company | Detecting saturation levels of a core sample using magnetic fields |
| CN108918574B (en) * | 2018-09-14 | 2021-01-15 | 张善文 | Method for measuring hydrogen index of crude oil by nuclear magnetic resonance |
| CN111058828B (en) * | 2019-11-13 | 2023-02-03 | 华东师范大学 | Rapid measurement system and method of fluid T1 relaxation spectrum based on surface nuclear magnetic resonance technology |
| CN111175336B (en) * | 2020-01-17 | 2023-04-07 | 西安石油大学 | Method for measuring and calculating nuclear magnetic resonance two-phase flow sensor |
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