CN113884531A - Imaging device and method for researching different section sequences of rock core based on nuclear magnetic resonance - Google Patents
Imaging device and method for researching different section sequences of rock core based on nuclear magnetic resonance Download PDFInfo
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- 238000003384 imaging method Methods 0.000 title claims abstract description 74
- 239000011435 rock Substances 0.000 title claims abstract description 50
- 238000005481 NMR spectroscopy Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title abstract description 12
- XLYOFNOQVPJJNP-ZSJDYOACSA-N Heavy water Chemical compound [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 claims abstract description 70
- 238000006073 displacement reaction Methods 0.000 claims abstract description 43
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000011737 fluorine Substances 0.000 claims abstract description 34
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 34
- 239000007788 liquid Substances 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 238000001228 spectrum Methods 0.000 claims description 12
- 238000012360 testing method Methods 0.000 claims description 12
- 239000012153 distilled water Substances 0.000 claims description 11
- 238000012876 topography Methods 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 5
- 239000000243 solution Substances 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000012047 saturated solution Substances 0.000 claims description 3
- 238000009738 saturating Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 239000010410 layer Substances 0.000 abstract description 10
- 238000011160 research Methods 0.000 abstract description 5
- 239000002356 single layer Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 239000011229 interlayer Substances 0.000 description 4
- 238000007405 data analysis Methods 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 150000002221 fluorine Chemical class 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000004611 spectroscopical analysis Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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- G01—MEASURING; TESTING
- 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
- G01N24/081—Making measurements of geologic samples, e.g. measurements of moisture, pH, porosity, permeability, tortuosity or viscosity
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Abstract
The invention discloses an imaging device and method for researching different section sequences of a rock core based on nuclear magnetic resonance, wherein the device comprises a three-axis circulating system, a heavy water container, a fluorine oil container, a holder, a microscopic morphology imaging system, a rock core, a confining pressure cavity, a back pressure system and a nuclear magnetic resonance analyzer; the invention carries out MRI imaging by 8 layers, can obtain the seepage rule of each section sequence under different displacement time, and can more truly reflect the seepage characteristics of the reservoir; the residual oil content of each single layer can be obtained through MRI imaging of 8 layers of XZ surfaces, so that the seepage condition of each part of the core in the displacement process can be obtained, and the seepage rule of the core is further obtained from a microscopic layer. The invention has high precision and low signal interference through nuclear magnetic resonance online scanning, and reduces the complexity of imaging operation; the usability is strong, the experimental data can be accurately acquired, and the accuracy of experimental research is improved.
Description
Technical Field
The invention relates to the technical field of seepage mechanics, in particular to an imaging device and method for researching different core segment sequences based on nuclear magnetic resonance.
Background
As is well known, the core experiment is an important technical means for researching the oil and gas migration rule, is helpful for understanding and mastering the seepage mechanism of oil and gas migration, and has certain guidance and reference effects on scientific and efficient development of oil reservoirs. On one hand, the core adopted in the conventional core physical simulation experiment is short, so that the change of the internal parameters of the core in the seepage process cannot be well reflected; on the other hand, when a scholars adopt the long core to perform related seepage experiments, the used device can only obtain the total seepage rule of the whole core, but cannot obtain the seepage rule of each section of the core. Therefore, incomplete knowledge generated by conventional core physical simulation experiments can negatively influence the research on reservoir seepage mechanisms.
Disclosure of Invention
Aiming at the defects in the prior art, the imaging device and the imaging method for researching different core section sequences based on nuclear magnetic resonance provided by the invention solve the problems that the seepage rule of each core section sequence cannot be obtained and the research accuracy is low in the prior art.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that:
the imaging device comprises a triaxial circulation system, a micro-morphology imaging system, a back pressure system, a nuclear magnetic resonance analyzer and other main components;
the three-axis circulating system is provided with a liquid storage tank which is connected with a heavy water container through a pipeline provided with a heavy water inlet valve; the heavy water container is connected with the rock core through a pipeline provided with a heavy water outlet valve; the liquid storage tank is connected with a fluorine oil container through a pipeline provided with a fluorine oil inlet valve; the fluorine oil container is connected with the confining pressure cavity through a pipeline provided with a fluorine oil outlet valve; the rock core is arranged in the confining pressure cavity through the holder; the outlet end of the clamper is connected with a back pressure system; a micro-topography imaging system is arranged outside the confining pressure cavity; the holder is connected with a nuclear magnetic resonance analyzer.
Further: the three-axis circulating system is controlled through a three-axis control interface and is used for providing high temperature and high pressure of displacement pressure and confining pressure.
Further: distilled water is filled in the liquid storage tank, and the distilled water is used as a displacement medium.
Further: the microscopic morphology imaging system is controlled by an imaging system control switch; the microtopography imaging system includes a material having a plurality of pores and is used to monitor the amount of solution displaced.
Further: a microtopography imaging system and a magnetic resonance analyzer were used to perform MRI imaging tests and T2 spectroscopy tests.
Further: the confining pressure cavity is used for providing confining pressure; the back pressure system is used to control the pressure at the outlet end of the holder.
Further: the core is a cylindrical core with the length of 8cm and the diameter of 2.5 cm; the pipeline is an iron pipeline.
The imaging method for researching different section sequences of the rock core based on nuclear magnetic resonance comprises the following steps:
s1, selecting a rock core, and dividing the rock core into 8 different sections;
s2, placing the core in an oven at 105 ℃ for drying for 8 hours;
s3, vacuumizing the core for 2 hours, and pressurizing and saturating the core by using a white oil saturated solution;
s4, placing the core after oil saturation treatment into a holder, and heating a heat shrink tube in the holder to completely seal the core;
s5, setting 20MPa confining pressure by injecting fluorine oil into a confining pressure cavity, and carrying out MRI imaging test on the rock core under the confining pressure condition for the first time;
s6, displacing oil phase of the heavy water in the heavy water container by controlling the triaxial circulation system at constant pressure, continuously testing T2 spectrums of the rock core at different displacement times, and simultaneously carrying out layer selection imaging of different sections until the displacement is suspended when the T2 spectrum shows set change, so as to obtain corresponding imaging graphs of the rock core under different sections of residual oil states;
s7, washing oil from the rock core;
and S8, changing the displacement pressure for a plurality of times, repeating the steps S2 to S8, and obtaining corresponding imaging graphs of the rock core under different displacement pressures in different sections of residual oil states.
The invention has the beneficial effects that:
1. the three-axis circulating system is a high-temperature high-pressure three-axis circulating system for providing displacement pressure and confining pressure, can drive the heavy water container to provide heavy water displacement for the rock core by controlling distilled water of the liquid storage tank, and can drive the fluorine oil container to provide stable confining pressure for the rock core by controlling the distilled water of the liquid storage tank;
2. the distilled water in the liquid storage tank can only provide a displacement medium, and other solutions in the container are not polluted;
3. the heavy water container and the fluorine oil container respectively provide stable liquid sources for the rock core, the rock core can be stably and orderly displaced in time, a valve can be closed in time when a laboratory is finished, and the situation that the flow direction of liquid cannot be controlled when a machine control fault occurs is avoided;
4. MRI imaging is carried out in 8 layers, so that the seepage rule of each section sequence under different displacement time can be obtained, and the seepage characteristics of a reservoir can be reflected more truly;
5. the heat shrink tube completely seals the core, so that the white oil can only flow along the pore throat and cannot seep to the side face of the core;
6. the rock core is fully dried before displacement, adsorbed water and interlayer water in the rock core can be fully removed, and the water is fully filtered under the condition that the rock core is not influenced, so that experimental data are basically not influenced by the adsorbed water and the interlayer water in the rock core;
7. selecting proper displacement pressure to repeat the experiment, wherein the difference of the displacement pressure can cause the capillary force or the viscous force inside the rock core to be dominant, so that the seepage images under different conditions can be conveniently and fully compared;
8. the invention has high precision and low signal interference through nuclear magnetic resonance online scanning, and reduces the complexity of imaging operation; the usability is strong, the experimental data can be accurately acquired, and the accuracy of experimental research is improved.
Drawings
FIG. 1 is a diagram of an apparatus of the present invention;
FIG. 2 is an imaging YZ-plane view of initial oil saturation of a core;
FIG. 3 is an imaging XZ plot of initial oil saturation of the core;
FIG. 4 is an imaging YZ-plane view of a core displacement process;
FIG. 5 is an imaging XZ surface diagram of a core displacement process;
FIG. 6 is an imaging YZ-plane view of the end of core displacement;
wherein: 1. a three-axis circulation system; 2. a liquid storage tank; 3. a three-axis control interface; 4. a heavy water inlet valve; 5. a heavy water container; 6. a heavy water outlet valve; 7. a fluorine oil inlet valve; 8. a fluorine oil container; 9. a fluorine oil outlet valve; 10. a holder; 11. a micro-topography imaging system; 12. a core; 13. a confining pressure cavity; 14. a back pressure system; 15. a nuclear magnetic resonance analyzer; 16. the imaging system controls the switch.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
As shown in fig. 1, the imaging device for researching different core segment sequences based on nuclear magnetic resonance comprises a triaxial circulation system 1, a heavy water container 5, a fluorine oil container 8, a holder 10, a micro-morphology imaging system 11, a core 12, a confining pressure cavity 13, a back pressure system 14 and a nuclear magnetic resonance analyzer 15;
the three-axis circulating system 1 is provided with a liquid storage tank 2, and the liquid storage tank 2 is connected with a heavy water container 5 through a pipeline provided with a heavy water inlet valve 4; the heavy water container 5 is connected with the rock core 12 through a pipeline provided with a heavy water outlet valve 6; the liquid storage tank 2 is connected with a fluorine oil container 8 through a pipeline provided with a fluorine oil inlet valve 7; the fluorine oil container 8 is connected with the confining pressure cavity 13 through a pipeline provided with a fluorine oil outlet valve 9; the core 12 is arranged inside the confining pressure cavity 13 through the holder 10; the outlet end of the holder 10 is connected to a back pressure system 14; a microscopic morphology imaging system 11 is arranged outside the confining pressure cavity 13; the holder 10 is connected to a nuclear magnetic resonance analyzer 15.
The triaxial circulation system 1 is controlled by a triaxial control interface 3 and is used for providing displacement pressure and confining pressure at high temperature and high pressure.
The liquid storage tank 2 is filled with distilled water which is a displacement medium.
The micro-topography imaging system 11 is controlled by an imaging system control switch 16; the microtopography imaging system 11 comprises a material with a plurality of pores and a capped cuvette is bound at the fluid outlet end for monitoring the amount of solution expelled.
The microtopography imaging system 11 and the magnetic resonance analyzer 15 are used to perform MRI imaging tests and T2 spectroscopy tests.
The confining pressure cavity 13 is used for providing confining pressure; a back pressure system 14 is used to control the pressure at the outlet end of the holder 10.
The core 12 is a cylindrical core 8cm long and 2.5cm in diameter; the pipeline is an iron pipeline.
The imaging method for researching different section sequences of the rock core based on nuclear magnetic resonance comprises the following steps:
s1, selecting a rock core 12, obtaining the volume of the rock core 12, and dividing the volume into 8 different sections;
s2, placing the core 12 in an oven at 105 ℃ for drying for 8 hours, and weighing the dry weight of the core 12;
s3, vacuumizing the core 12 for 2 hours, pressurizing and saturating the core 12 by using a white oil saturated solution, and weighing the wet weight of the core 12; subtracting the dry weight from the wet weight and dividing by the fluorine oil density to obtain the volume of the saturated fluorine oil; dividing the volume of the saturated fluorine oil by the volume of the core 12 to obtain the saturation of the core; wherein the core saturation is subsequently used for data analysis in combination with the T2 spectrum;
s4, placing the core 12 after oil saturation treatment into a holder 10, and heating a heat shrinkable tube in the holder 10 to completely seal the core;
s5, setting 20MPa confining pressure by injecting fluorine oil into the confining pressure cavity 13, and carrying out MRI imaging test on the rock core 12 under the confining pressure condition for the first time; MRI imaging comprising 8 layers of XZ planes and one YZ plane;
s6, displacing the heavy water in the heavy water container 5 by controlling the triaxial circulation system 1 at a constant pressure for oil phase of the core, continuously testing the T2 spectrum of the core at different displacement times, and simultaneously performing layer selection imaging of different sections until the T2 spectrum changes in a set manner, and suspending the displacement until corresponding imaging graphs of the core 12 in different sections under the state of residual oil are obtained;
s7, taking out the core 12 and weighing, calculating the volume of the residual oil in the core 12 according to the density difference between the heavy water and the white oil, and dividing the volume of the residual oil by the volume of the core 12 to obtain the saturation of the residual oil; wherein residual oil saturation is used for data analysis in combination with T2 spectra; washing the rock core 12 with oil;
and S8, changing the displacement pressure for a plurality of times, repeating the steps S2 to S8, and obtaining corresponding imaging graphs of the rock core 12 under different displacement pressures under different oil remaining states of different sections.
In one embodiment of the present invention, the T2 spectrum signal measured by loading the core 12 into the apparatus at step S2 dry weight can be used as a base signal to compare with the subsequent T2 spectrum for analysis, the micro-topography imaging system 11 collects the volume of heavy water and the volume of fluorine oil expelled during step S3, divides the volume of fluorine oil expelled by the core volume to obtain the residual oil saturation, and combines the residual oil saturation with the T2 spectrum for subsequent data analysis.
The heavy water is 1 MPa.s, and the white oil is 3-5 MPa.s.
As shown in fig. 2 and 3, corresponding to the results obtained in step S5, the two graphs are MRI imaging results under the condition of confining pressure applied to the core 12 for the first time, and at this time, both MRI imaging of 8 XZ planes and MRI imaging of one YZ plane show that fluorine oil (gray black) is relatively more distributed on both sides of the interior of the core, while fluorine oil is relatively less distributed in the middle of the core, and the distribution is relatively uniform.
As shown in fig. 4 to 6, corresponding to step S6, where fig. 4 is an imaging diagram of a core displacement process (YZ plane, taking first displacement as an example), fig. 5 is an imaging diagram of a core displacement process (XZ plane, taking first displacement as an example), it can be seen that, in the displacement process, the content of fluorine oil at the heavy water interface end is very small, most of the fluorine oil is concentrated at the fluorine oil outlet end, and MRI imaging of 8 layers of XZ planes can obtain the remaining oil content of each monolayer, so that the seepage condition of each part of the core in the displacement process can be further obtained, and thus the seepage rule of the core is obtained from the microscopic layer. Fig. 6 is an image of the end of core displacement, when only a little fluorine oil remains and the rest of the core has been displaced by heavy water.
The three-axis circulating system is a high-temperature high-pressure three-axis circulating system for providing displacement pressure and confining pressure, can drive the heavy water container to provide heavy water displacement for the rock core by controlling the distilled water of the liquid storage tank, and can drive the fluorine oil container to provide stable confining pressure for the rock core by controlling the distilled water of the liquid storage tank; the distilled water in the liquid storage tank can only provide a displacement medium, and other solutions in the container are not polluted; the heavy water container and the fluorine oil container respectively provide stable liquid sources for the rock core, the rock core can be stably and orderly displaced in time, a valve can be closed in time when a laboratory is finished, and the situation that the flow direction of liquid cannot be controlled when a machine control fault occurs is avoided; MRI imaging is carried out in 8 layers, so that the seepage rule of each section sequence under different displacement time can be obtained, and the seepage characteristics of a reservoir can be reflected more truly; the heat shrink tube completely seals the core, so that the white oil can only flow along the pore throat and cannot seep to the side face of the core; the rock core is fully dried before displacement, adsorbed water and interlayer water in the rock core can be fully removed, and the water is fully filtered under the condition that the rock core is not influenced, so that experimental data are basically not influenced by the adsorbed water and the interlayer water in the rock core; selecting proper displacement pressure to repeat the experiment, wherein the difference of the displacement pressure can cause the capillary force or the viscous force inside the rock core to be dominant, so that the seepage images under different conditions can be conveniently and fully compared; the invention has high precision and low signal interference through nuclear magnetic resonance online scanning, and reduces the complexity of imaging operation; the usability is strong, the experimental data can be accurately acquired, and the accuracy of experimental research is improved.
Claims (8)
1. An imaging device for researching different section sequences of rock core based on nuclear magnetic resonance is characterized in that: the device comprises a triaxial circulating system (1), a heavy water container (5), a fluorine oil container (8), a holder (10), a micro-topography imaging system (11), a rock core (12), a confining pressure cavity (13), a back pressure system (14) and a nuclear magnetic resonance analyzer (15);
the three-axis circulating system (1) is provided with a liquid storage tank (2), and the liquid storage tank (2) is connected with a heavy water container (5) through a pipeline provided with a heavy water inlet valve (4); the heavy water container (5) is connected with the rock core (12) through a pipeline provided with a heavy water outlet valve (6); the liquid storage tank (2) is connected with a fluorine oil container (8) through a pipeline provided with a fluorine oil inlet valve (7); the fluorine oil container (8) is connected with the confining pressure cavity (13) through a pipeline provided with a fluorine oil outlet valve (9); the core (12) is arranged in the confining pressure cavity (13) through the holder (10); the outlet end of the clamper (10) is connected with a back pressure system (14); a microscopic topography imaging system (11) is arranged outside the confining pressure cavity (13); the holder (10) is connected with a nuclear magnetic resonance analyzer (15).
2. The imaging device for researching different core segment sequences based on nuclear magnetic resonance as claimed in claim 1, is characterized in that: the three-axis circulating system (1) is controlled through a three-axis control interface (3) and is used for providing high temperature and high pressure of displacement pressure and confining pressure.
3. The imaging device for researching different core segment sequences based on nuclear magnetic resonance as claimed in claim 1, is characterized in that: distilled water is filled in the liquid storage tank (2), and the distilled water is a displacement medium.
4. The imaging device for researching different core segment sequences based on nuclear magnetic resonance as claimed in claim 1, is characterized in that: the micro-topography imaging system (11) is controlled by an imaging system control switch (16); the microtopography imaging system (11) includes a material having a plurality of pores and is used to monitor the amount of solution displaced.
5. The imaging device for researching different core segment sequences based on nuclear magnetic resonance as claimed in claim 1, is characterized in that: the microtopography imaging system (11) and the nuclear magnetic resonance analyzer (15) are used for carrying out MRI imaging tests and T2 spectrum tests.
6. The imaging device for researching different core segment sequences based on nuclear magnetic resonance as claimed in claim 1, is characterized in that: the confining pressure cavity (13) is used for providing confining pressure; the back pressure system (14) is used for controlling the pressure at the outlet end of the clamper (10).
7. The imaging device for researching different core segment sequences based on nuclear magnetic resonance as claimed in claim 1, is characterized in that: the core (12) is 8cm long, the diameter of the cylindrical core is 2.5cm, and the pipeline is an iron pipeline.
8. An imaging method for researching different section sequences of a rock core based on nuclear magnetic resonance is characterized by comprising the following steps:
s1, selecting a rock core (12) and dividing the rock core into 8 different sections;
s2, placing the core (12) in an oven at 105 ℃ for drying for 8 hours;
s3, vacuumizing the core (12) for 2 hours, and pressurizing and saturating the core (12) by using a white oil saturated solution;
s4, placing the core (12) subjected to oil saturation treatment into a holder (10), and heating a heat shrinkable tube in the holder (10) to completely seal the core;
s5, setting 20MPa confining pressure by injecting fluorine oil into a confining pressure cavity (13), and carrying out MRI imaging test on the rock core (12) under the confining pressure condition for the first time;
s6, displacing the oil phase of the heavy water in the heavy water container (5) by controlling the triaxial circulation system (1) at a constant pressure, continuously testing the T2 spectrum of the rock core at different displacement times, and simultaneously carrying out layer selection imaging of different sections until the T2 spectrum changes in a set manner, so as to obtain corresponding imaging graphs of the rock core (12) in different sections of residual oil states;
s7, washing the oil from the rock core (12);
and S8, changing the displacement pressure for a plurality of times, repeating the steps S2 to S8, and obtaining corresponding imaging graphs of the rock core (12) under different displacement pressures in different sections of residual oil states.
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