CN102518434A - Micro-detection probe for nuclear magnetic resonance analysis of fluid - Google Patents
Micro-detection probe for nuclear magnetic resonance analysis of fluid Download PDFInfo
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- CN102518434A CN102518434A CN2011104097498A CN201110409749A CN102518434A CN 102518434 A CN102518434 A CN 102518434A CN 2011104097498 A CN2011104097498 A CN 2011104097498A CN 201110409749 A CN201110409749 A CN 201110409749A CN 102518434 A CN102518434 A CN 102518434A
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Abstract
The invention provides a micro-detection probe for nuclear magnetic resonance analysis of fluid. The probe comprises a ring permanent magnet, and a high-permeability shell fitted over the outer wall of the ring permanent magnet. A strip micro-coil structure is arranged at the middle part of the ring permanent magnet, and is sleeved with a gradient coil. The strip micro-coil structure comprises an upper shielding copper layer, an upper substrate, a strip line copper layer, a lower substrate and a lower shielding copper layer. The upper substrate and the lower substrate are provided thereon with a fluid channel, respectively. The strip line copper layer is sandwiched between the upper substrate and the lower substrate, for forming a radio-frequency magnetic field in the fluid channels under the action of applying current. The upper shielding copper layer is arranged on the surface of the upper substrate opposite to the strip line copper layer. The lower shielding copper layer is arranged on the surface of the lower substrate opposite to the strip line copper layer. The strip coil micro-detection probe of the invention has small volume, and the generated magnetic field has uniform intensity.
Description
Technical field
The present invention relates to formation fluid parameter detecting technology, relate in particular to a kind of nuclear magnetic resonance fluid and analyze little detection probe.
Background technology
In the oil field operation development process, need to use the modular formation tester liquid to be got on the stratum, for Petroleum Production provides important reference data so that formation fluid pollution condition and fluid behaviour are carried out the Real-Time Evaluation analysis.Wherein, Down-hole optical fluid analysis module and downhole NMR fluid analysis module are two kinds of common bottom fluid parameter detection equipments; The optical fluid analysis module is based on gas and the fluid properties in reflection of light and the transmission principle identification fluid line, and the content of definite fluid; Nuclear magnetic resonance fluid analysis module is to utilize nuclear magnetic resonance principle to measure fluid parameter T
1, with evaluation formation fluid pollution condition, and measurement parameter T
2Obtain parameters such as fluid viscosity, gas-oil ratio with D.
Nuclear magnetic resonance fluid analysis module is to come for test provides required magnetic field through detection probe, to utilize nmr phenomena test fluid flow parameter T
1, T
2And D.Along with hardware technology and MEMS (Micro-Electro-Mechanical Systems; MEMS) development of technology; Propose a kind of nuclear magnetic resonance fluid and analyzed little detection probe; It can utilize little coil probe incorporated small low-cost spectrometer, particularly can combine with microflow control techniques such as the Capillary Electrophoresis of maturation or fluid separation applications and form micro-total analysis system on the sheet, and the convection cell parameter is measured.Adopt little detection probe of little coil form, have low in energy consumption, volume is little and characteristics such as detection sensitivity height, can be applied to oil field, be particularly suitable for the measurement requirement of boring low-power consumption.
The nuclear magnetic resonance fluid is analyzed little detection probe and is based on the nuclear magnetic resonance spectroscopy principle; Utilize the existence or the molecular structure of nmr phenomena and chemical shift effect thereof research compound; Because the varying environment variations in temperature along with depth of stratum under the oil well is very big, the requirement that the downhole NMR magnetostatic field uniformity does not reach NMR spectrum, therefore; Can be test fluid through little detection probe required magnetic field is provided, with convection cell parameter T
1, T
2Measure with D.At present; Adopt the nuclear magnetic resonance fluid to analyze in little detection probe; Usually adopt little coil of snail and toroidal winding, it utilizes little coil of snail and toroidal winding structure, and fluid channel and magnetic field are provided; Measure required magnetic field for the fluid through fluid channel provides, but the RF magnetic field uniformity of its formation is relatively poor.
Summary of the invention
The present invention provides a kind of nuclear magnetic resonance fluid to analyze little detection probe, can effectively overcome the problem that prior art exists.
The present invention provides a kind of nuclear magnetic resonance fluid to analyze little detection probe, comprising: annular permanent magnet, and be set in the high magnetic conductive shell on the said annular permanent magnet outer wall;
The middle part of said annular permanent magnet is provided with banded little loop construction, and is arranged with gradient coil on the little loop construction of said band shape;
The little loop construction of said band shape comprises shielding copper layer, upper substrate, strip line copper layer, infrabasal plate and shields the copper layer down;
Be respectively arranged with the fluid passage on said upper substrate and the infrabasal plate;
Said strip line copper layer is folded between said upper substrate and the infrabasal plate, is used in said fluid passage, forming RF magnetic field applying under the function of current;
The said shielding copper layer of going up is arranged on the said upper substrate, with said strip line copper layer back to the surface;
Said down shielding copper layer is arranged on the said infrabasal plate, with said strip line copper layer back to the surface.
Above-mentioned nuclear magnetic resonance fluid is analyzed in little detection probe, and said strip line copper layer comprises effective strip line copper layer and edge copper layer;
The middle part width of said effective strip line copper layer forms the groove that is caved inward by both sides less than the width of end at the middle part of said effective strip line copper layer;
Said edge copper layer is arranged in the said groove, and has the gap between said edge copper layer and the said effective strip line copper layer.
Above-mentioned nuclear magnetic resonance fluid is analyzed in little detection probe, and the shape of said groove and edge copper layer is trapezoidal.
Above-mentioned nuclear magnetic resonance fluid is analyzed in little detection probe, and said shielding copper layer, strip line copper layer and the following screen layer gone up forms through the MEMS fabrication techniques.
Above-mentioned nuclear magnetic resonance fluid is analyzed in little detection probe, and said fluid passage is oval fluid passage.
Above-mentioned nuclear magnetic resonance fluid is analyzed in little detection probe, and said upper substrate and infrabasal plate are the borate glass substrate.
Above-mentioned nuclear magnetic resonance fluid is analyzed in little detection probe, and the two ends of said fluid passage are connected with capillary tube respectively, is used for external fluid is imported said fluid passage.
Above-mentioned nuclear magnetic resonance fluid is analyzed in little detection probe, and said capillary tube is made the capillary tube that obtains for adopting polyether-ether-ketone resin.
The little detection probe of nuclear magnetic resonance fluid analyzer provided by the invention; Shielding copper layer, strip line copper layer and following shielding copper layer form the little loop construction of strip line in the utilization; Can required magnetic field be provided for two fluid passages that are formed on upper substrate and the infrabasal plate; Make and detect under the same volume sample situation that the probe of existing relatively toroidal winding structure has littler volume; Simultaneously, more even through the magnetic field of adopting the little loop construction of strip line to form, to the magnetostatic field B of annular permanent magnet generation
0Disturb for a short time, it is more accurate to make fluid parameter detect.Little detection probe volume provided by the invention is little, low in energy consumption, can be combined in the formation testing instrument convection cell parameter and measure, and can effectively reduce the size of whole stratum tester.
Description of drawings
Structural representation when the nuclear magnetic resonance fluid that Fig. 1 provides for the embodiment of the invention is analyzed little detection probe and combined with formation tester;
The nuclear magnetic resonance fluid that Fig. 2 provides for the embodiment of the invention is analyzed the structural representation of little detection probe;
Fig. 3 A is the perspective structure sketch map of banded little coil in the embodiment of the invention;
Fig. 3 B is the package assembly sketch map of banded little coil in the embodiment of the invention;
Fig. 4 is the structural representation of strip line copper layer in the embodiment of the invention;
The magnetic field sketch map that Fig. 5 produces when being applied with electric current for the cross-sectional structure of Fig. 3 A and strip line copper layer;
Fig. 6 is the RF magnetic field changes in amplitude curve synoptic diagram of embodiment of the invention longshore current body channel direction;
Fig. 7 is the structural representation of gradient coil in the embodiment of the invention;
Fig. 8 is that the nuclear magnetic resonance fluid that utilizes the embodiment of the invention to provide is analyzed little detection probe and carried out the pulse train sketch map of fluid parameter when measuring.
The specific embodiment
Structural representation when the nuclear magnetic resonance fluid that Fig. 1 provides for the embodiment of the invention is analyzed little detection probe and combined with formation tester; The nuclear magnetic resonance fluid that Fig. 2 provides for the embodiment of the invention is analyzed the structural representation of little detection probe; Fig. 3 A is the perspective structure sketch map of banded little coil in the embodiment of the invention; Fig. 3 B is the package assembly sketch map of banded little coil in the embodiment of the invention.As shown in Figure 1; The formation testing instrument is arranged on the sketch map under the oil well; This formation testing instrument comprises hydraulic module 1, probe module 2, little detection probe 3, measures and finish sampling module 4 and pump module 5; Wherein, hydraulic module 1 can be introduced instrument internal through probe module 2 with formation fluid; Little detection probe 3 also is that the nuclear magnetic resonance fluid that the embodiment of the invention provides is analyzed little detection probe, can carry out NMR relaxation time and propagation measurement to formation fluid; Measure end sampling module 4 and can fluid sampling perhaps be drained into well 6 through pumping module 5 with fluid.
As shown in Figure 2; Structure for amplifying sketch map for little detection probe 3 among Fig. 1; This little detection probe 3 specifically can comprise: annular permanent magnet 31, high magnetic conductive shell 32, banded little loop construction 33 and gradient coil 34, and wherein, high magnetic conductive shell 32 is set on the outer wall of annular permanent magnet 1; Banded little loop construction 33 is arranged on the middle part of annular permanent magnet 31, and gradient coil 34 is set on banded little loop construction 33.In the present embodiment, annular permanent magnet 31 can form even magnetostatic field B in the central area
0, high magnetic conductive shell 32 maskable magnetic fields also provide the magnetic circuit of a closure simultaneously, thereby can improve the uniformity and the stability in the magnetic field that is formed on the central area to external radiation.
Shown in Fig. 3 A and Fig. 3 B; Banded little loop construction 33 comprise upper substrate 331, infrabasal plate 332, strip line copper layer 333, on shield copper layer 334 and shielding copper layer 335 down; Wherein, Upper substrate 331 is oppositely arranged with infrabasal plate 332, is respectively arranged with fluid passage C on upper substrate 331 and the infrabasal plate 332, and this fluid passage C runs through the fluid passage of substrate; Strip line copper layer 333 is folded between upper substrate 331 and the infrabasal plate 332, and this strip line copper layer 333 is used for can in the fluid passage, forming RF magnetic field applying under the function of current; Last shielding copper layer 334 be arranged on the upper substrate 331 with strip line copper layer 333 back to the surface; The i.e. upper surface of upper substrate 331 shown in Fig. 3 B; Shield down copper layer 335 be provided with on the infrabasal plate 332 with strip line copper layer 333 back to the surface, i.e. the soffit of infrabasal plate 332 shown in Fig. 3 B.
In the present embodiment; Last shielding copper layer 334, strip line copper layer 333 and down shielding copper layer 335 form banded little coil; For the fluid parameter measurement provides required RF magnetic field; It specifically can be formed on the glass substrate by the MEMS fabrication techniques, particularly, can adopt MEMS technologies such as photoresist mask, copper plating to be produced on the glass substrate; Strip line copper layer 333 can apply electric current, producing required magnetic field, but received signal again simultaneously, thus can measure fluid parameter by strip line copper layer 333.Can find out, in the present embodiment current channel by strip line copper layer 333, on shield copper layer 334 and down shielding copper layer 335 constitute, wherein; Electric current can flow through from strip line copper layer 333; Last shielding copper layer 334 is a screen layer with shielding copper layer 335 down, also is the loop, in the time of can making electric current through strip line copper layer 333; The RF magnetic field that forms in the fluid passage on upper substrate 331 and infrabasal plate 332 is more even, and the zone of uniform magnetic field is bigger.
When it will be understood by those skilled in the art that actual measurement, on to shield copper layer 334 all are ground connection copper layers with shielding copper layer 335 down; And with the earth terminal of strip line copper layer 333 altogether; Thereby these three copper layers capable of using produce banded little loop construction, think that fluid measurement provides required RF magnetic field.
In the present embodiment; The fluid passage that is formed on upper substrate 331 and the infrabasal plate 332 is oval fluid passage; The oval fluid passage that is provided with can make when strip line copper layer 333 applies electric current, in this fluid passage, forms magnetic field more uniformly; The suffered magnetic field of the fluid of this fluid passage of flowing through is also more even, can effectively improve the accuracy that fluid parameter is measured.
In the present embodiment, upper substrate 331 is the borate glass substrate with infrabasal plate 332, like this, on shield copper layer 334, strip line copper layer 333 and down shielding copper layer 335 separated by the borate glass substrate.
Fig. 4 is the structural representation of strip line copper layer in the embodiment of the invention.In the present embodiment, as shown in Figure 4, strip line copper layer 333 comprises effective strip line copper layer 3331 and two edge copper layers 3332; Wherein, Effectively the middle part width of strip line copper layer 3331 is less than its end width, thereby forms the groove A that is caved inward by both sides at the effective middle part of strip line copper layer 333, and edge copper layer 3332 is arranged in this groove A; And have gap B between edge copper layer 3332 and the effective strip line copper layer 3331, make edge copper layer 3332 not link to each other with effective strip line copper layer 3331.Through the groove structure that both sides cave inward is arranged at the middle part of effective strip line copper layer 3331; Make that the middle part of effective strip line copper layer 3331 is narrower; Like this; When electric current passed through, the current density at the narrower place of middle part width increased, the magnetic field intensity B that it produces in fluid passage in upper substrate 331 and infrabasal plate 332
1Will strengthen, thereby improve the magnetic field intensity that is applied to the fluid passage inner fluid.
In the present embodiment, above-mentioned groove A and the trapezium structure of edge copper layer 3332 for cooperatively interacting like this, can make can produce stronger magnetic field intensity at the middle part of effective strip line copper layer 3331.
In the present embodiment; Fluid for ease of getting in the formation testing instrument gets into the fluid passage; Can be connected with capillary tube respectively at the two ends of fluid passage, be used for external fluid is imported the fluid passage, particularly; This capillary tube specifically can be the employing polyether-ether-ketone, and (Poly-Ether-Ether-Ketone, PEEK) resin is made the capillary tube that obtains.
The magnetic field sketch map that Fig. 5 produces when applying electric current for the cross-sectional structure of Fig. 3 A and strip line copper layer.As shown in Figure 5, on to shield copper layer 334 are two screen layers with shielding copper layer 335 down, can magnetic field be shielded; The current density at strip line copper layer 333 middle part is bigger, and the magnetic field that strip line copper layer 333 produces can be bound in the central region of whole little detection probe, wherein, and the magnetostatic field B that the annular permanent magnet 31 among Fig. 2 produces
0Direction is as shown in Figure 5, and strip line copper layer 333 applies the magnetic field B that forms behind the electric current
1Direction is as shown in Figure 5, can find out two B that oval fluid channel C forms in upper substrate 331 and the infrabasal plate 332
1In the opposite direction.Like this, through little loop construction of strip line copper layer formation, and annular permanent magnet, can be the fluid parameter measurement required B is provided
0And B
1Magnetic field has reached the test needs.
Fig. 6 is the RF magnetic field changes in amplitude curve synoptic diagram of embodiment of the invention longshore current body channel direction.As shown in Figure 6, when strip line copper layer 333 applies electric current, the RF magnetic field changes in amplitude sketch map that produces along the direction of fluid of upper substrate or infrabasal plate; Wherein, Fig. 6 abscissa is the length of strip line copper layer, and ordinate is the magnetic field intensity of the RF magnetic field of strip line copper layer generation; Can find out; Position-4mm to 4mm at strip line copper layer locates, and the magnetic field intensity of generation is about 2.04 Gausses (Gauss), therefore; The effective length of strip line copper layer is 8mm, and the oval fluid passage length that is formed on upper substrate and the infrabasal plate should be at least 8mm.
Fig. 7 is the structural representation of gradient coil in the embodiment of the invention.As shown in Figure 7, gradient coil 34 can form magnetic field gradient, to accomplish the measurement of diffusion; Particularly; This gradient coil 34 can comprise two parts coil up and down, can be when measuring diffuse fluid coefficient D for gradient coil 34 apply certain electric current, and the sense of current is shown in arrow among Fig. 7; Thereby can form gradient magnetic, D measures with the convection cell parameter.There is linear gradient in the magnetic field that gradient coil 34 forms in the z direction, and parallel and magnetostatic field B
0Direction promptly is superimposed upon magnetostatic field B
0On, both form a new gradient magnetic.
In the present embodiment, the nuclear magnetic resonance fluid is analyzed little detection probe can apply certain magnetic field to the fluid that gets in the fluid passage, thereby convection cell carries out NMR relaxation time and propagation measurement, thereby obtains fluid parameter T
1, T
2And D.Wherein, spin spinrelaxation T
2Be the most frequently used in a nuclear magnetic resonance log measurement parameter, through to T
2Analysis, can effectively obtain geological informations such as fluid type, fluid content, particularly, spin spinrelaxation T
2Usually accomplish with CPMG pulse train a as shown in Figure 8 during measurement, it is the basis with the self-rotary echo-pulse series, confirms transverse relaxation through the attenuation process of observed spin echo string; Longitudinal relaxation time T
1Be that an amount and geological informations such as fluid type, fluid content that characterize the magnetization vector recovery extent have contact closely, its fundamental method of measurement is to accomplish through saturation recovery pulse train b as shown in Figure 8; Diffusion coefficient D is an amount that characterizes fluid viscosity, and its fundamental method of measurement is to accomplish through pulse train c as shown in Figure 8.Fluid parameter T in the present embodiment
1, T
2Similar with concrete measuring process and the prior art of D, no longer specify at this.
Embodiment of the invention nuclear magnetic resonance fluid analysis probe can be used for during the nuclear magnetic resonance fluid is analyzed under the oil well; The characteristic nmr and the constituent that are used for fluid detect; This nuclear magnetic resonance fluid analysis can be made up use with cable or with boring formation tester; Under the reservoir conditions environment, obtain the information of formation fluid characteristics, be used for open hole well or perforation rear sleeve well.
What should explain at last is: above embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although with reference to previous embodiment the present invention has been carried out detailed explanation, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the scope of the essence disengaging various embodiments of the present invention technical scheme of relevant art scheme.
Claims (8)
1. a nuclear magnetic resonance fluid is analyzed little detection probe, it is characterized in that, comprising: annular permanent magnet, and be set in the high magnetic conductive shell on the said annular permanent magnet outer wall;
The middle part of said annular permanent magnet is provided with banded little loop construction, and is arranged with gradient coil on the little loop construction of said band shape;
The little loop construction of said band shape comprises shielding copper layer, upper substrate, strip line copper layer, infrabasal plate and shields the copper layer down;
Be respectively arranged with the fluid passage on said upper substrate and the infrabasal plate;
Said strip line copper layer is folded between said upper substrate and the infrabasal plate, is used in said fluid passage, forming RF magnetic field applying under the function of current;
The said shielding copper layer of going up is arranged on the said upper substrate, with said strip line copper layer back to the surface;
Said down shielding copper layer is arranged on the said infrabasal plate, with said strip line copper layer back to the surface.
2. nuclear magnetic resonance fluid according to claim 1 is analyzed little detection probe, it is characterized in that, said strip line copper layer comprises effective strip line copper layer and edge copper layer;
The middle part width of said effective strip line copper layer forms the groove that is caved inward by both sides less than the width of end at the middle part of said effective strip line copper layer;
Said edge copper layer is arranged in the said groove, and has the gap between said edge copper layer and the said effective strip line copper layer.
3. nuclear magnetic resonance fluid according to claim 2 is analyzed little detection probe, it is characterized in that, the shape of said groove and edge copper layer is trapezoidal.
4. analyze little detection probe according to claim 1,2 or 3 described nuclear magnetic resonance fluids, it is characterized in that, said shielding copper layer, strip line copper layer and the following screen layer gone up forms through the MEMS fabrication techniques.
5. analyze little detection probe according to claim 1,2 or 3 described nuclear magnetic resonance fluids, it is characterized in that, said fluid passage is oval fluid passage.
6. nuclear magnetic resonance fluid according to claim 1 is analyzed little detection probe, it is characterized in that, said upper substrate and infrabasal plate are the borate glass substrate.
7. the little detection probe of nuclear magnetic resonance fluid analyzer according to claim 1 is characterized in that the two ends of said fluid passage are connected with capillary tube respectively, is used for external fluid is imported said fluid passage.
8. the little detection probe of nuclear magnetic resonance fluid analyzer according to claim 7 is characterized in that, said capillary tube is made the capillary tube that obtains for adopting polyether-ether-ketone resin.
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| CN108957373A (en) * | 2017-05-24 | 2018-12-07 | 布鲁克碧奥斯平股份公司 | Nmr probe and Nuclear Magnetic Resonance Measurement equipment |
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