CN109682850B - Nuclear magnetic resonance testing device for online imbibition experiment and experiment method - Google Patents
Nuclear magnetic resonance testing device for online imbibition experiment and experiment method Download PDFInfo
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- CN109682850B CN109682850B CN201811581754.5A CN201811581754A CN109682850B CN 109682850 B CN109682850 B CN 109682850B CN 201811581754 A CN201811581754 A CN 201811581754A CN 109682850 B CN109682850 B CN 109682850B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N24/00—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
- G01N24/08—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects by using nuclear magnetic resonance
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Abstract
The invention discloses a nuclear magnetic resonance testing device and a nuclear magnetic resonance testing method for an online imbibition experiment, and the nuclear magnetic resonance testing device comprises a constant-pressure maintaining system, a porous medium system and a low-field nuclear magnetic resonance analyzer, wherein the constant-pressure maintaining system comprises a constant-pressure constant-speed pump, the front end of the constant-pressure constant-speed pump is connected with a water container I, the rear end of the constant-pressure constant-speed pump is arranged above a water container II, the bottom of the water container II is connected with an inlet of the porous medium system, an outlet of the water container II is connected with a precision balance, the porous medium system is placed in a magnetic field generated by the low-field nuclear magnetic resonance analyzer, the porous medium system comprises an organic glass tube, the front end of the organic glass tube is provided; the invention also provides an on-line imbibition experimental method. The invention meets the test requirements of the online imbibition experiment, has simple device structure, simple and convenient operation and low nuclear magnetic signal interference, and can obtain accurate test results and small experimental errors and carry out repeated experiments for many times.
Description
Technical Field
The invention belongs to the technical field of oil and gas reservoir development, and particularly relates to an experimental nuclear magnetic resonance testing device and an experimental method for online imbibition.
Background
The oil gas water is rich in hydrogen nuclei, so in the petroleum industry, the most common characteristic atom of nuclear magnetic resonance is the hydrogen nuclei, the hydrogen nuclei keep rotating continuously, and under the action of a specific external magnetic field, the hydrogen nuclei and the magnetic field generate strong interaction and are externally represented as nuclear magnetic signals. When the porous medium is only saturated with one fluid, the nuclear magnetic resonance T2 spectrum can reflect the pore distribution, and the nuclear magnetic resonance T2 spectrum can be used for researching the occurrence state of the fluid in the rock sample and analyzing the movable fluid and the movable oil in the rock sample. Because nuclear magnetic resonance belongs to a nondestructive research means and can accurately reveal the occurrence relation of fluid in pores, the importance of nuclear magnetic resonance in the petroleum industry is promoted year by year in recent years. At present, the nuclear magnetic resonance test mode of the imbibition experiment is an off-line test, namely after the imbibition experiment is finished, the rock core is taken out of the displacement device, and then nuclear magnetic resonance scanning is carried out. Because nuclear magnetic resonance equipment is very sensitive to environmental variables, the test mode easily causes larger experimental error, thereby influencing the accuracy of nuclear magnetic resonance results. At present, scholars at home and abroad have developed some online nuclear magnetic resonance measurement experimental devices, but due to the high precision requirement of the imbibition experiment, the existing devices cannot meet the online test requirement of the mechanism research of the imbibition experiment, and have the defects of complex structure, difficult operation, nuclear magnetic signal interference and the like, so that the nuclear magnetic resonance test device system for the online imbibition experiment and the experimental method which are simple and convenient to operate and have low signal interference need to be developed.
Disclosure of Invention
Aiming at the defects, the invention provides the nuclear magnetic resonance testing device and the nuclear magnetic resonance testing method for the online imbibition experiment, which meet the testing requirements of the online imbibition experiment, have the advantages of simple structure, simple and convenient operation and low nuclear magnetic signal interference, and the method has accurate testing result and small experimental error and can be used for repeated experiments.
In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problems is as follows: the nuclear magnetic resonance testing device for the online imbibition experiment comprises a constant-pressure maintaining system, a porous medium system and a low-field nuclear magnetic resonance analyzer, wherein the porous medium system is arranged in the low-field nuclear magnetic resonance analyzer, the constant-pressure maintaining system comprises a constant-pressure constant-speed pump, the front end of the constant-pressure constant-speed pump is connected with a first water container through a pipeline and a valve, the rear end of the constant-pressure constant-speed pump is arranged above a second water container through a pipeline and a valve, a recovery device is arranged below the second water container, the bottom of the recovery device is connected with an inlet of the porous medium system through a pipeline and a valve, an outlet of the porous medium system is connected with a precision balance through a pipeline, the low-field nuclear magnetic resonance analyzer comprises a control box and a computer, the porous medium system is placed in a magnetic field generated by the low-field nuclear magnetic resonance analyzer, the porous medium system comprises, The back end of the steel wire mesh and the weak magnetic metal sealing element are sequentially arranged, the organic glass tube and the weak magnetic metal sealing elements at two ends form a closed space, and quartz sand is filled in the organic glass tube.
The invention has the beneficial effects that: the first water container contains simulated formation water, the second water container contains simulated formation water pumped by a constant-pressure constant-speed pump, the lower recovery device is used for recovering the simulated formation water overflowing from the second water container, quartz sand with different meshes is filled in an organic glass tube to simulate porous media with different permeabilities, a steel wire mesh can prevent the quartz sand from leaking sand, the compaction effect of a matrix is ensured, weak magnetic metal sealing pieces at two ends can effectively avoid interference on nuclear magnetic resonance measurement, and a low-field nuclear magnetic resonance analyzer is used for T2 spectrum scanning and nuclear magnetic resonance imaging to precisely measure the oil yield; during the experiment, the constant-pressure constant-speed pump pumps the simulated formation water from the first water container into the second water container at a constant speed, the simulated formation water enters the porous medium system through a pipeline after the second water container is filled, then the porous medium system is connected to a precision balance, the porous medium system is placed in a magnetic field generated by a low-field nuclear magnetic resonance analyzer, T2 spectrum scanning and fixed-point nuclear magnetic resonance imaging are carried out in stages, and experimental data are recorded for result analysis.
Further, the permeability of the core slice is less than that of the quartz sand.
The beneficial effect of adopting the further scheme is that: the infiltration process is ensured to be the same-direction infiltration, and the infiltration is from the inlet to the outlet of the porous medium system.
Further, the core slice is a500 mD water-wet core slice.
The beneficial effect of adopting the further scheme is that: the permeability of the 500mD core slice is less than that of quartz sand, so that the same-direction seepage and absorption are ensured.
Further, the water container II is level with the porous medium system, and the liquid level of the water container II after being filled with water is higher than that of the porous medium system.
The beneficial effect of adopting the further scheme is that: the second water container is level with the porous medium system, and the liquid level of the second water container after being filled with water is slightly higher than that of the porous medium system, so that capillary resistance in a pipeline is balanced, the seepage experiment only depends on capillary force between a wetting phase and the porous medium, the influence of external pressure difference factors is eliminated, the experiment result is more accurate, and the experiment can be repeated for many times.
Further, the length of the organic glass tube is 60mm, the inner diameter is 10mm, and the thickness of the core slice is 2 mm.
The beneficial effect of adopting the further scheme is that: the length of the organic glass tube is 60mm, the length of the organic glass tube is consistent with the length of an effective nuclear magnetic resonance measurement interval, the accuracy of a result is guaranteed, the thickness of a rock core slice is 2mm, and the imbibition process is guaranteed to be equidirectional imbibition.
The experimental method for carrying out online imbibition by adopting the testing device sequentially comprises the following steps:
s1, closing an outlet of the porous medium system, filling quartz sand into the organic glass tube, placing a core slice at an inlet after compacting, and sealing two ends by adopting weak magnetic metal sealing elements;
s2, injecting 3PV simulated formation water into the porous medium system at the speed of 0.5m L/min, and then injecting simulated formation oil into the porous medium system at the speed of 0.5m L/min until no simulated formation water is produced;
s3, connecting each pipeline, checking the instrument and the low-field nuclear magnetic resonance analyzer, closing all valves, and returning the precision balance to zero for later use;
s4, opening the first valve and the second valve, keeping the third valve closed, starting the constant-pressure constant-speed pump, setting the constant-speed pump to be in a constant-speed mode, and continuously pumping simulated formation water into the second water container at the speed of 2m L/min to enable the second water container to be always in a full-filling state;
s5, opening a valve III and a low-field nuclear magnetic resonance analyzer, starting a imbibition experiment, recording the oil production amount in the precision balance, carrying out T2 spectrum scanning once every 10min, and carrying out nuclear magnetic resonance imaging at fixed points every 30 min;
s6, closing the constant-pressure constant-speed pump, the low-field nuclear magnetic resonance analyzer and the valves, collating experimental data and analyzing experimental results;
s7, changing any one parameter of the viscosity of the simulated formation water, the viscosity or the components of the simulated formation oil and the mesh number of the quartz sand, repeating S1-S6, and recording experimental data.
Further, the magnetic field intensity of the low-field nuclear magnetic resonance analyzer is 0.5 +/-0.05T, and the main frequency is 21.3 MHz.
In summary, the experimental method provided by the invention has the following advantages:
1. the experimental method is simple and convenient to operate, the online imbibition method is adopted, the precision is high, the signal interference is low, the oil production of the imbibition experiment can be accurately measured, T2 spectrum scanning and nuclear magnetic resonance imaging results are obtained, and the accuracy of the experimental result is improved.
2. The experimental method has repeatability, repeated experiments are carried out under the same experimental conditions, the experimental results are verified, or a control variable method is adopted, one of the conditions is changed, and the influence and the change rule of the control variable method on the imbibition experiment are researched.
3. The method is adopted for experiment, the obtained result is researched and analyzed, the imbibition rules under different conditions can be summarized, and technical support is provided for oil and gas reservoir development.
Drawings
FIG. 1 is a schematic view of the apparatus of the present invention;
FIG. 2 is a schematic view of a porous media system;
wherein, 1, a water container I; 2. a pipeline; 3. a first valve; 4. a constant pressure constant speed pump; 5. a second valve; 6. a water container II; 7. a recovery device; 8. a third valve; 9. a low-field nuclear magnetic resonance analyzer; 10. a porous media system; 11. a control box; 12. a computer; 13. a precision balance; 14. an organic glass tube; 15. a weak magnetic metal seal; 16. a core slice; 17. steel wire mesh; 18. an inlet; 19. and (7) an outlet.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
In one embodiment of the present invention, as shown in fig. 1-2, there is provided a nmr test apparatus for on-line imbibition experiments, comprising a constant pressure maintaining system, a porous medium system 10 and a low-field nmr analyzer 9, wherein the low-field nmr analyzer 9 is of a model of meso mr23-060H-I, the porous medium system 10 is disposed in the low-field nmr analyzer 9, the constant pressure maintaining system comprises a constant pressure constant speed pump 4, the constant pressure constant speed pump 4 is an ISCO constant speed constant pressure pump, the front end of the constant pressure constant speed pump 4 is connected to a first water container 1 through a pipeline 2 and a valve 3, the rear end is disposed above a second water container 6 through a pipeline 2 and a valve 5, a recovery device 7 is disposed below the second water container 6, the bottom is connected to an inlet 18 of the porous medium system 10 through a pipeline 2 and a valve three 8, an outlet 19 of the porous medium system 10 is connected to a precision balance 13 through a pipeline 2, the model of the precision balance 13 is JA5003N, the precision is 0.001g, the low-field nuclear magnetic resonance analyzer 9 comprises a control box 11 and a computer 12, the porous medium system 10 is placed in a magnetic field generated by the low-field nuclear magnetic resonance analyzer 9, the porous medium system 10 comprises an organic glass tube 14, a core thin sheet 16, a steel wire mesh 17 and a weak magnetic metal sealing piece 15 are sequentially arranged at the front end of the organic glass tube 14, the steel wire mesh 17 and the weak magnetic metal sealing piece 15 are sequentially arranged at the rear end of the organic glass tube 14, the organic glass tube 14 and the weak magnetic metal sealing pieces 15 at the two ends form a closed space, and quartz sand is filled in the organic glass tube 14; the water container I1 contains simulated formation water, the water container II 6 contains simulated formation water pumped by the constant-pressure constant-speed pump 4, the recovery device 7 below is used for recovering the simulated formation water overflowing from the water container II 6, the organic glass tube 14 is filled with quartz sand with different meshes to simulate porous media with different permeabilities, the steel wire mesh 17 can prevent the quartz sand from leaking sand and ensure the compaction effect of a substrate, the weak magnetic metal sealing parts 15 at two ends can effectively avoid interference on nuclear magnetic resonance measurement, the low-field nuclear magnetic resonance analyzer 9 is used for T2 spectrum scanning and nuclear magnetic resonance imaging, and the precision balance 13 is used for measuring the oil yield; during the experiment, the constant-pressure constant-speed pump 4 pumps simulated formation water from the water container I1 into the water container II 6 at a constant speed, the simulated formation water enters the porous medium system 10 through the pipeline 2 after the water container II 6 is filled, then the porous medium system 10 is connected to the precision balance 13, the porous medium system 10 is placed in a magnetic field generated by the low-field nuclear magnetic resonance analyzer 9, T2 spectrum scanning and fixed-point nuclear magnetic resonance imaging are carried out in stages, the experiment time is recorded, and the result analysis is carried out.
The permeability of the core slice 16 is less than that of the quartz sand, so that the same-direction imbibition process is ensured, and the core slice permeates from the inlet 18 to the outlet 19 of the porous medium system 10; the core slice 16 is a500 mD water-wet core slice, the 500mD core slice 16 has a permeability less than that of quartz sand, and the same-direction seepage and absorption are ensured; the second water container 6 is level with the porous medium system 10, and the liquid level of the second water container 6 after being filled is slightly higher than that of the porous medium system 10, so that capillary resistance in the pipeline 2 is balanced, the seepage experiment only depends on capillary force between the wetting phase and the porous medium, the influence of external pressure difference factors is eliminated, the experiment result is more accurate, and the experiment can be repeated for multiple times; 14 length of organic glass pipe is 60mm, internal diameter 10mm, and 16 thickness of rock core thin slice are 2mm, and 14 length of organic glass pipe are 60mm, and is unanimous with the effective measurement interval length of nuclear magnetic resonance, guarantee the accuracy of result, and 16 thickness of rock core thin slice are 2mm, guarantee that the imbibition process is the syntropy imbibition.
When the device is used, configured simulated formation water is filled into the water container I1, the simulated formation water is pumped into the water container II 6 from the water container I1 at a constant speed by the constant-pressure constant-speed pump 4, the simulated formation water enters the porous medium system 10 through the pipeline 2 after the water container II 6 is filled, then the porous medium system 10 is connected to the precision balance 13, the porous medium system 10 is placed in a magnetic field generated by the low-field nuclear magnetic resonance analyzer 9, T2 spectrum scanning and fixed-point nuclear magnetic resonance imaging are carried out in stages, and experimental data are recorded.
The experimental method for carrying out online imbibition by adopting the testing device sequentially comprises the following steps:
s1, closing an outlet 18 of the porous medium system 10, filling quartz sand into the organic glass tube 14, compacting, placing a core slice 16 at an inlet 19, and sealing two ends by adopting weak magnetic metal sealing elements 15;
s2, injecting 3PV simulated formation water into the porous medium system 10 at the speed of 0.5m L/min, and then injecting simulated formation oil into the porous medium system 10 at the speed of 0.5m L/min until no simulated formation water is produced;
s3, connecting each pipeline 2, checking the instrument and the low-field nuclear magnetic resonance analyzer 9, closing all valves, and enabling the precision balance 13 to return to zero for standby;
s4, opening the first valve 3 and the second valve 5, keeping the third valve 8 closed, starting the constant-pressure constant-speed pump 4, setting the constant-speed mode, and continuously pumping simulated formation water into the second water container 6 at the speed of 2m L/min to enable the second water container 6 to be always in a full-filling state;
s5, opening a valve III 8 and a low-field nuclear magnetic resonance analyzer 9, starting a imbibition experiment, recording the oil production amount in the precision balance 13, carrying out T2 spectrum scanning every 10min, and carrying out nuclear magnetic resonance imaging at a fixed point every 30 min;
s6, closing the constant-pressure constant-speed pump 4, the low-field nuclear magnetic resonance analyzer 9 and the valves, collating experimental data and analyzing experimental results;
s7, changing any one parameter of the viscosity of the simulated formation water, the viscosity or the components of the simulated formation oil and the mesh number of the quartz sand, repeating S1-S6, and recording experimental data.
Wherein, the magnetic field intensity of the low-field nuclear magnetic resonance analyzer 9 is 0.5 +/-0.05T, and the main frequency is 21.3 MHz.
The nuclear magnetic resonance testing device and the nuclear magnetic resonance testing method for the online imbibition experiment meet the testing requirements of the online imbibition experiment, are suitable for mechanism research, have the advantages of simple structure, simple and convenient operation and low nuclear magnetic signal interference, and can obtain accurate testing results and small experimental errors and carry out repeated experiments.
While the present invention has been described in detail with reference to the illustrated embodiments, it should not be construed as limited to the scope of the present patent. Various modifications and changes may be made by those skilled in the art without inventive step within the scope of the appended claims.
Claims (3)
1. The nuclear magnetic resonance testing device for the online imbibition experiment is characterized by comprising a constant-pressure maintaining system, a porous medium system (10) and a low-field nuclear magnetic resonance analyzer (9), wherein the porous medium system (10) is arranged in the low-field nuclear magnetic resonance analyzer (9), the constant-pressure maintaining system comprises a constant-pressure constant-speed pump (4), the front end of the constant-pressure constant-speed pump (4) is connected with a first water container (1) through a pipeline (2) and a first valve (3), the rear end of the constant-pressure constant-speed pump is arranged above a second water container (6) through the pipeline (2) and a second valve (5), a recovery device (7) is arranged below the second water container (6), the bottom of the recovery device is connected with an inlet (18) of the porous medium system (10) through the pipeline (2) and a third valve (8), an outlet (19) of the porous medium system (10) is connected with a precision balance (13) through the pipeline (2), the low-field nuclear magnetic resonance analyzer (9) comprises a control box (11) and a computer (12), the porous medium system (10) is placed in a magnetic field generated by the low-field nuclear magnetic resonance analyzer (9), the porous medium system (10) comprises an organic glass tube (14), a core thin sheet (16), a steel wire mesh (17) and a weak magnetic metal sealing element (15) are sequentially arranged at the front end of the organic glass tube (14), the steel wire mesh (17) and the weak magnetic metal sealing element (15) are sequentially arranged at the rear end of the organic glass tube (14), the organic glass tube (14) and the weak magnetic metal sealing elements (15) at the two ends form a closed space, and quartz sand is filled in the organic glass tube (14); the permeability of the core slice (16) is smaller than that of the quartz sand, the core slice (16) is a500 mD water-wet core slice, the second water container (6) is flush with the porous medium system (10), the liquid level height of the second water container (6) after being filled is higher than that of the porous medium system (10), the length of the organic glass tube (14) is 60mm, the inner diameter of the organic glass tube is 10mm, and the thickness of the core slice (16) is 2 mm.
2. An experimental method for on-line imbibition using the test device of claim 1, comprising the following steps in sequence:
s1, closing an outlet of the porous medium system (10), filling quartz sand into the organic glass tube (14), compacting, placing a core slice (16) at an inlet (18), and sealing two ends by adopting weak magnetic metal sealing elements (15);
s2, injecting 3PV simulated formation water into the porous medium system (10) at the speed of 0.5m L/min, and then injecting simulated formation oil into the porous medium system (10) at the speed of 0.5m L/min until no simulated formation water is produced;
s3, connecting each pipeline (2), checking the instrument and the low-field nuclear magnetic resonance analyzer (9), closing all valves, and returning the precision balance (13) to zero for standby;
s4, opening the first valve (3) and the second valve (5), keeping the third valve (8) closed, starting the constant-pressure constant-speed pump (4), setting the constant-speed mode, and continuously pumping simulated formation water into the second water container (6) at the speed of 2m L/min to enable the second water container (6) to be always in a full-filling state;
s5, opening a valve III (8) and a low-field nuclear magnetic resonance analyzer (9), starting a imbibition experiment, recording the oil production amount in a precision balance (13), carrying out T2 spectrum scanning every 10min, and carrying out nuclear magnetic resonance imaging at a fixed point every 30 min;
s6, closing the constant-pressure constant-speed pump (4), the low-field nuclear magnetic resonance analyzer (9) and the valves, collating experimental data and analyzing experimental results;
s7, changing any one parameter of the viscosity of the simulated formation water, the viscosity or the components of the simulated formation oil and the mesh number of the quartz sand, repeating S1-S6, and recording experimental data.
3. The experimental method according to claim 2, characterized in that the low-field nuclear magnetic resonance analyzer (9) has a magnetic field strength of 0.5 ± 0.05T and a main frequency of 21.3 MHz.
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| CN110553969B (en) * | 2019-08-22 | 2020-08-04 | 西安交通大学 | Experimental device for measuring porous medium low temperature wicking characteristic with adjustable superheat degree |
| CN111274528B (en) * | 2020-03-02 | 2021-09-17 | 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 |
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