CN109682850A - A kind of online imbibition experiment nuclear magnetic resonance test device and experimental method - Google Patents
A kind of online imbibition experiment nuclear magnetic resonance test device and experimental method Download PDFInfo
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Abstract
The invention discloses a kind of online imbibition experiment nuclear magnetic resonance test device and experimental methods, system is maintained including constant pressure, porous media system and low-field nuclear magnetic resonance analyzer, it includes constant pressure constant speed pump that constant pressure, which maintains system, constant pressure constant speed pump front end is connect with water container one, rear end is arranged above water container two, two bottom of water container is connect with the entrance of porous media system, outlet is connect with precision balance, porous media system is placed in the magnetic field of low-field nuclear magnetic resonance analyzer generation, porous media system includes lucite tube, lucite tube front end is provided with core wafer, steel wire and weak magnetic metal seal, rear end is provided with steel wire and weak magnetic metal seal；The present invention also provides online imbibition experimental methods.The present invention meets online imbibition experiment test request, and apparatus structure is simple, and easy to operate, nuclear magnetic signal interference is low, and test result obtained by this method is accurate, and experimental error is small, can carry out multiplicating experiment.
Description
Technical field
The invention belongs to Reservoir Development technical fields, and in particular to a kind of online imbibition experiment nuclear magnetic resonance test
Device and experimental method.
Background technique
Proton is rich in oil gas water, therefore, in the oil industry, the atom of the most common characteristic of nuclear magnetic resonance is proton,
Proton itself holding ceaselessly rotates, and occurs under the action of specific externally-applied magnetic field, between these proton meetings and magnetic field strong
Interaction, externally show as nuclear magnetic signal.When porous media is only saturated a kind of fluid, nuclear magnetic resonance T 2 spectrum is able to reflect
Distribution of pores can be used to study the occurrence status of fluid in rock sample, to the movable fluid in rock sample using nuclear magnetic resonance T 2 spectrum
It is analyzed with moveable oil.Since nuclear magnetic resonance belongs to a kind of lossless research means, the fluid in hole can be accurately disclosed
Hosting relation, in recent years, importance rises year by year nuclear magnetic resonance in the oil industry.The nuclear magnetic resonance test of the experiment of imbibition at present
Mode is off-line test, i.e., after imbibition experiment, rock core is taken out from driving device, then carries out MRI scan.
Since nuclear magnetic resonance equipment is very sensitive to environmental variance, such test mode be easy to cause biggish experimental error, thus shadow
Ring the accuracy of nuclear magnetic resonance result.Domestic and foreign scholars have developed some on-line NMR measurement experiment devices at present, but
It is since imbibition experiment is to required precision height, existing device is not able to satisfy the on-line testing requirement of imbibition experiment mechanism study,
In the presence of structure is complicated, operating difficulties and the disadvantages of there are nuclear magnetic signal interference, it is therefore necessary to develop a kind of easy to operate, signal
Interfere low online imbibition experiment nuclear magnetic resonance test device system and experimental method.
Summary of the invention
In view of the above deficiencies, the present invention provides a kind of online imbibition experiment nuclear magnetic resonance test device and experimental method,
Meet online imbibition experiment test request, apparatus structure is simple, and easy to operate, nuclear magnetic signal interference is low, test obtained by this method
As a result accurate, experimental error is small, can carry out multiplicating experiment.
To achieve the above object, the technical solution adopted by the present invention to solve the technical problems is: providing a kind of online infiltration
Experiment nuclear magnetic resonance test device is inhaled, including constant pressure maintains system, porous media system and low-field nuclear magnetic resonance analyzer, it is more
Hole medium system is arranged in low-field nuclear magnetic resonance analyzer, and it includes constant pressure constant speed pump that constant pressure, which maintains system, before constant pressure constant speed pump
End is connect by pipeline and valve one with water container one, and rear end is arranged above water container two by pipeline and valve two, is filled with water
Recyclable device is provided with below device two, and bottom is connect by pipeline and valve three with the entrance of porous media system, porous Jie
The outlet of matter system is connect by pipeline with precision balance, and low-field nuclear magnetic resonance analyzer includes control cabinet and computer, porous
Medium system is placed in the magnetic field of low-field nuclear magnetic resonance analyzer generation, and porous media system includes lucite tube, organic
Glass tube front end is disposed with core wafer, steel wire and weak magnetic metal seal, and rear end is disposed with steel wire and weak
Magnetic metal seal, lucite tube and both ends weak magnetic metal seal form enclosure space, and are filled in lucite tube
Quartz sand.
The beneficial effects of the present invention are: water container one contains simulated formation water, water container two contains constant pressure constant speed pump and pumps out
Simulated formation water, the recyclable device of lower section is used to recycle the simulated formation water of the spilling of water container two, passes through in lucite tube
The quartz sand for filling different meshes, simulates the porous media of different permeabilities, steel wire can prevent quartz sand sand leakage, protect simultaneously
The consolidation effect of matrix is demonstrate,proved, the weak magnetic metal seal at both ends can effectively avoid interfering Nuclear Magnetic Resonance Measurement, low field
Magnetic nuclear resonance analyzer is then used for the scanning of T2 spectrum and Magnetic resonance imaging, and precision balance measures oil production；When experiment, constant pressure constant speed
Simulated formation water is pumped into water container two by pump from constant speed in water container one, and simulation water flooding passes through pipeline after water container two is full of
Into porous media system, it is then attached to precision balance, porous media system is placed on the generation of low-field nuclear magnetic resonance analyzer
Magnetic field in, carry out the scanning of T2 spectrum and fixed point Magnetic resonance imaging stage by stage, and record experimental data, be used for interpretation of result.
Further, core wafer permeability is less than quartz sand permeability.
Using the beneficial effect of above-mentioned further scheme is: guarantee imbibition process is imbibition in the same direction, from porous media system
Entrance is permeated to export direction.
Further, core wafer is 500mD water-wet core wafer.
Beneficial effect using above-mentioned further scheme is: the core wafer of 500mD, and permeability is less than quartz sand, guarantees
Imbibition in the same direction.
Further, water container two and porous media system maintain an equal level, and water container two be full of after liquid level be higher than it is porous
Medium system.
Beneficial effect using above-mentioned further scheme is: water container two and porous media system maintain an equal level, and water container two
Liquid level after being full of is slightly above porous media system, for balancing the hollow billet resistance in pipeline, relies only on imbibition experiment
The wet mutually capillary force between porous media acts on, and excludes the influence of extraneous pressure difference factor, keeps experimental result more accurate,
It can be repeated several times and be tested.
Further, organic glass length of tube is 60mm, and internal diameter 10mm, core wafer is with a thickness of 2mm.
Using the beneficial effect of above-mentioned further scheme is: organic glass length of tube is effectively surveyed for 60mm, with nuclear magnetic resonance
It is consistent to measure siding-to-siding block length, guarantees the accuracy of result, for core wafer with a thickness of 2mm, guarantee imbibition process is imbibition in the same direction.
The experimental method of online imbibition is carried out using above-mentioned test device, successively the following steps are included:
S1, porous media system outlet is closed, quartz sand is filled into lucite tube, after compacting, place rock in entrance
Heart thin slice, both ends are sealed using weak magnetic metal seal；
S2,3PV simulated formation water is injected into porous media system with the speed of 0.5mL/min, then with 0.5mL/min
Speed injected into porous media system simulated formation oil, up to no simulated formation aquatic products goes out；
S3, each pipeline of connection, check instrument and low-field nuclear magnetic resonance analyzer, close all valves, precision balance zero
For use；
S4, valve one and valve two are opened, valve three is kept to close, opened constant pressure constant speed pump, be set as constant speed mode, with
2mL/min speed is persistently pumped into simulated formation water into water container two, and water container two is made to remain full state；
S5, valve three and low-field nuclear magnetic resonance analyzer are opened, starts imbibition experiment, records the oil-producing in precision balance
Amount carries out a T2 spectrum scanning every 10min, pinpoints every 30min and carry out Magnetic resonance imaging；
S6, constant pressure constant speed pump, low-field nuclear magnetic resonance analyzer and each valve are closed, experimental data is arranged, to experimental result
It is analyzed；
S7, change any one of simulated formation water viscosity, simulated formation oil viscosity or component, quartz sand mesh number parameter, repeat
S1~S6, and record experimental data.
Further, the magnetic field strength of low-field nuclear magnetic resonance analyzer is 0.5 ± 0.05T, basic frequency 21.3MHz.
In conclusion experimental method provided by the invention has the advantage that
1, this experimental method is easy to operate, and using online imbibition method, precision is high, and signal interference is low, can accurately measure
Oil production is tested in imbibition, obtains the scanning of T2 spectrum and Magnetic resonance imaging as a result, improving the accuracy of experimental result.
2, this experimental method has repeatability, carried out under identical experiment condition repeat experiment, confirmatory experiment as a result,
Or control variate method is used, change wherein a certain condition, studies its influence and changing rule to imbibition experiment.
3, it is tested using this practical approach, acquired results is researched and analysed, can summarized and obtain different condition
Under imbibition rule, provide technical support for Reservoir Development.
Detailed description of the invention
Fig. 1 is the schematic diagram of apparatus of the present invention；
Fig. 2 is the schematic diagram of porous media system；
Wherein, 1, water container one；2, pipeline；3, valve one；4, constant pressure constant speed pump；5, valve two；6, water container two；7, it returns
Receiving apparatus；8, valve three；9, low-field nuclear magnetic resonance analyzer；10, porous media system；11, control cabinet；12, computer；13,
Precision balance；14, lucite tube；15, weak magnetic metal seal；16, core wafer；17, steel wire；18, entrance；19, go out
Mouthful.
Specific embodiment
Specific embodiments of the present invention will be described in detail with reference to the accompanying drawing.
In one embodiment of the present of invention, as shown in Figs. 1-2, provides a kind of online imbibition experiment and tested with nuclear magnetic resonance
Device, including constant pressure maintain system, porous media system 10 and low-field nuclear magnetic resonance analyzer 9, low-field nuclear magnetic resonance analyzer 9
Model MesoMR23-060H-I, porous media system 10 are arranged in low-field nuclear magnetic resonance analyzer 9, and constant pressure maintains system
Including constant pressure constant speed pump 4, constant pressure constant speed pump 4 is ISCO constant speed and constant pressure pump, and 4 front end of constant pressure constant speed pump passes through pipeline 2 and valve 1
It is connect with water container 1, rear end is arranged above water container 26 by pipeline 2 and valve 25, and 26 lower section of water container is provided with
Recyclable device 7, and bottom is connect by pipeline 2 and valve 38 with the entrance 18 of porous media system 10, porous media system 10
Outlet 19 connect with precision balance 13 by pipeline 2, precision balance 13 model JA5003N, precision 0.001g, low field nuclear-magnetism
Resonance analytical instrument 9 includes control cabinet 11 and computer 12, and porous media system 10 is placed on the generation of low-field nuclear magnetic resonance analyzer 9
Magnetic field in, porous media system 10 include lucite tube 14,14 front end of lucite tube be disposed with core wafer 16,
Steel wire 17 and weak magnetic metal seal 15, rear end are disposed with steel wire 17 and weak magnetic metal seal 15, organic glass
Pipe 14 and both ends weak magnetic metal seal 15 form enclosure space, and quartz sand is filled in lucite tube 14；Water container 1
Simulated formation water is contained, water container 26 contains the simulated formation water that constant pressure constant speed pump 4 pumps out, and the recyclable device 7 of lower section is used for back
The simulated formation water that water container 26 overflows is received, passes through the quartz sand of filling different meshes in lucite tube 14, simulates different infiltrations
The porous media of saturating rate, steel wire 17 can prevent quartz sand sand leakage, while guarantee the consolidation effect of matrix, the weak magnetic gold at both ends
Belonging to sealing element 15 can effectively avoid interfering Nuclear Magnetic Resonance Measurement, and low-field nuclear magnetic resonance analyzer 9 is then swept for T2 spectrum
It retouches and Magnetic resonance imaging, precision balance 13 measures oil production；When experiment, constant pressure constant speed pump 4 is by simulated formation water from water container
Constant speed is pumped into water container 26 in one 1, and simulation water flooding enters porous media system by pipeline 2 after water container 26 is full of
10, it is then attached to precision balance 13, porous media system 10 is placed in the magnetic field of the generation of low-field nuclear magnetic resonance analyzer 9,
The scanning of T2 spectrum and fixed point Magnetic resonance imaging are carried out stage by stage, and records experimental period, are used for interpretation of result.
16 permeability of core wafer is less than quartz sand permeability, and guarantee imbibition process is imbibition in the same direction, from porous media system
10 entrances 18 of uniting are permeated to 19 directions of outlet；Core wafer 16 is 500mD water-wet core wafer, and the core wafer 16 of 500mD seeps
Saturating rate is less than quartz sand, guarantees imbibition in the same direction；After water container 26 and porous media system 10 maintain an equal level, and water container 26 is full of
Liquid level is slightly above porous media system 10, for balancing the hollow billet resistance in pipeline 2, imbibition experiment is made to rely only on wet phase
Capillary force effect between porous media, excludes the influence of extraneous pressure difference factor, keeps experimental result more accurate, can also be multiple
Repeat to test；14 length of lucite tube is 60mm, and internal diameter 10mm, core wafer 16 is with a thickness of 2mm, lucite tube 14
Length is 60mm, consistent with the effective surveying range length of nuclear magnetic resonance, guarantees the accuracy of result, core wafer 16 with a thickness of
2mm, guarantee imbibition process are imbibition in the same direction.
In use, configured simulated formation water is fitted into water container 1, constant pressure constant speed pump 4 by simulated formation water from
Constant speed is pumped into water container 26 in water container 1, and simulation water flooding enters porous media by pipeline 2 after water container 26 is full of
System 10, is then attached to precision balance 13, and porous media system 10 is placed on the magnetic field of the generation of low-field nuclear magnetic resonance analyzer 9
In, the scanning of T2 spectrum and fixed point Magnetic resonance imaging are carried out stage by stage, and record experimental data.
The experimental method of online imbibition is carried out using above-mentioned test device, successively the following steps are included:
S1, the outlet of porous media system 10 18 is closed, quartz sand is filled into lucite tube 14, after compacting, in entrance
19 place core wafer 16, and both ends are sealed using weak magnetic metal seal 15；
S2,3PV simulated formation water is injected into porous media system 10 with the speed of 0.5mL/min, then with 0.5mL/
The speed of min injects simulated formation oil into porous media system 10, up to no simulated formation aquatic products goes out；
S3, each pipeline 2 of connection, check instrument and low-field nuclear magnetic resonance analyzer 9, close all valves, precision balance 13
Zero is stand-by；
S4, valve 1 and valve 25 are opened, valve 38 is kept to close, opened constant pressure constant speed pump 4, be set as constant speed mould
Formula is persistently pumped into simulated formation water into water container 26 with 2mL/min speed, water container 26 is made to remain full state；
S5, valve 38 and low-field nuclear magnetic resonance analyzer 9 are opened, starts imbibition experiment, records the production in precision balance 13
Oil mass carries out a T2 spectrum scanning every 10min, pinpoints every 30min and carry out Magnetic resonance imaging；
S6, constant pressure constant speed pump 4, low-field nuclear magnetic resonance analyzer 9 and each valve are closed, arranges experimental data, experiment is tied
Fruit is analyzed；
S7, change any one of simulated formation water viscosity, simulated formation oil viscosity or component, quartz sand mesh number parameter, repeat
S1~S6, and record experimental data.
Wherein, the magnetic field strength of low-field nuclear magnetic resonance analyzer 9 is 0.5 ± 0.05T, basic frequency 21.3MHz.
Online imbibition experiment nuclear magnetic resonance test device and experimental method provided by the invention, meet online imbibition experiment
Test request is suitable for mechanism study, and apparatus structure is simple, easy to operate, and nuclear magnetic signal interference is low, test knot obtained by this method
Fruit is accurate, and experimental error is small, can carry out multiplicating experiment.
Although being described in detail in conjunction with attached drawing to a specific embodiment of the invention, should not be construed as special to this
The restriction of the protection scope of benefit.In range described by claims, those skilled in the art are without creative work
The various modifications and deformation that can make still belong to the protection scope of this patent.
Claims (7)
1. a kind of online imbibition experiment nuclear magnetic resonance test device, which is characterized in that maintain system, porous media including constant pressure
System (10) and low-field nuclear magnetic resonance analyzer (9), porous media system (10) setting is in the low-field nuclear magnetic resonance point
In analyzer (9), it includes constant pressure constant speed pump (4) that the constant pressure, which maintains system, and constant pressure constant speed pump (4) front end passes through pipeline (2)
It is connect with valve one (3) with water container one (1), rear end is arranged by the pipeline (2) and valve two (5) in water container two (6)
Top is provided with recyclable device (7) below the water container two (6), and bottom by the pipeline (2) and valve three (8) and
The entrance (18) of the porous media system (10) connects, and the outlet (19) of the porous media system (10) passes through the pipeline
(2) it is connect with precision balance (13), the low-field nuclear magnetic resonance analyzer (9) includes control cabinet (11) and computer (12), institute
It states porous media system (10) to be placed in the magnetic field that the low-field nuclear magnetic resonance analyzer (9) generates, the porous media system
System (10) includes lucite tube (14), and lucite tube (14) front end is disposed with core wafer (16), steel wire
(17) and weak magnetic metal seal (15), rear end are disposed with the steel wire (17) and the weak magnetic metal seal
(15), the lucite tube (14) forms enclosure space, and organic glass with weak magnetic metal seal (15) described in both ends
Quartz sand is filled in glass pipe (14).
2. online imbibition experiment nuclear magnetic resonance test device as described in claim 1, which is characterized in that the core wafer
(16) permeability is less than the quartz sand permeability.
3. online imbibition experiment nuclear magnetic resonance test device as claimed in claim 2, which is characterized in that the core wafer
It (16) is 500mD water-wet core wafer.
4. online imbibition experiment nuclear magnetic resonance test device as described in claim 1, which is characterized in that the water container two
(6) with the porous media system (10) maintain an equal level, and the water container two (6) be full of after liquid level be higher than porous Jie
Matter system (10).
5. online imbibition experiment nuclear magnetic resonance test device as described in claim 1, which is characterized in that the organic glass
Pipe (14) length is 60mm, and internal diameter 10mm, the core wafer (16) is with a thickness of 2mm.
6. carrying out the experimental method of online imbibition using test device of any of claims 1-5, which is characterized in that
Successively the following steps are included:
S1, porous media system (10) outlet is closed, to quartz sand is filled in lucite tube (14), after compacting, in entrance
(18) core wafer (16) are placed, both ends are sealed using weak magnetic metal seal (15)；
S2,3PV simulated formation water is injected into porous media system (10) with the speed of 0.5mL/min, then with 0.5mL/min
Speed to injection simulated formation oil in porous media system (10), up to no simulated formation aquatic products goes out；
S3, each pipeline (2) of connection, check instrument and low-field nuclear magnetic resonance analyzer (9), close all valves, precision balance
(13) zero is stand-by；
S4, valve one (3) and valve two (5) are opened, valve three (8) is kept to close, opened constant pressure constant speed pump (4), be set as permanent
Fast mode is persistently pumped into simulated formation water into water container two (6) with 2mL/min speed, remains water container two (6) and fills
Full state；
S5, valve three (8) and low-field nuclear magnetic resonance analyzer (9) are opened, starts imbibition experiment, records in precision balance (13)
Oil production carries out a T2 spectrum scanning every 10min, pinpoints every 30min and carry out Magnetic resonance imaging；
S6, constant pressure constant speed pump (4), low-field nuclear magnetic resonance analyzer (9) and each valve are closed, arranges experimental data, experiment is tied
Fruit is analyzed；
S7, change simulated formation water viscosity, simulated formation oil viscosity or any component, quartz sand mesh number parameter, repeat
S1~S6, and record experimental data.
7. experimental method as claimed in claim 6, which is characterized in that the magnetic field of the low-field nuclear magnetic resonance analyzer (9) is strong
Degree is 0.5 ± 0.05T, basic frequency 21.3MHz.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110284880A (en) * | 2019-06-18 | 2019-09-27 | 中国石油大学(华东) | A kind of Carbonate acidizing earthworm hole dynamic expansion real-time monitoring device and its working method |
| CN110553969A (en) * | 2019-08-22 | 2019-12-10 | 西安交通大学 | Experimental device for measuring porous medium low temperature wicking characteristic with adjustable superheat degree |
| CN111274528A (en) * | 2020-03-02 | 2020-06-12 | 中国石油大学(北京) | Reservoir fracture imbibition quality prediction method and system |
| CN111323834A (en) * | 2020-04-23 | 2020-06-23 | 中国地质大学（北京） | Imbibition device for carrying out spontaneous imbibition on-line monitoring by combining nuclear magnetic resonance technology |
| CN113218834A (en) * | 2021-03-31 | 2021-08-06 | 长江大学 | Experimental device and method for quantitatively describing seepage damage of dense gas fracturing fluid and reservoir |
| CN114062217A (en) * | 2020-08-07 | 2022-02-18 | 中国石油化工股份有限公司 | Saturated rock core under-pressure imbibition experimental device and method |
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| CN113218834A (en) * | 2021-03-31 | 2021-08-06 | 长江大学 | Experimental device and method for quantitatively describing seepage damage of dense gas fracturing fluid and reservoir |
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