Pulse nuclear magnetic resonance device for fluid characterization difference detection

Abstract

The invention discloses a pulse nuclear magnetic resonance device for fluid characterization difference detection, and belongs to the technical field of pulse nuclear magnetic resonance device scanning. The device comprises a workbench, a pulse nuclear magnetic resonance device body is fixedly arranged at the top of the workbench, a mounting base is fixedly arranged on the inner side wall of the pulse nuclear magnetic resonance device body, the mounting base is arranged in an inverted T shape, and a shell fixedly sleeves the top of the mounting base; an air and liquid discharging mechanism is arranged between the top of the workbench and the shell, a confining pressure cavity is formed in the shell, a sample containing mechanism is arranged in the confining pressure cavity, and a liquid inlet mechanism is arranged between the mounting seat and the top of the workbench. The problems that an existing pulse nuclear magnetic resonance device is low in maximum scanning voltage and weak in ray penetrating capacity and cannot meet the scanning requirement, rock core flowing is affected by pressure and temperature, a rock core sample is prone to displacement, and the experiment success rate and accuracy are greatly limited are solved.

Description

Technical Field

[0001] The invention relates to the technical field of pulse nuclear magnetic resonance device scanning, in particular to a pulse nuclear magnetic resonance device for fluid characterization difference detection. Background Art

[0002] In recent years, pulsed nuclear magnetic resonance devices have gradually been used in the field of masonry oil layer physics experiments. Its characteristics of non-destructive detection and quantitative visualization of samples make it an important experimental characterization method.

[0003] Taking the low-permeability and ultra-low-permeability core flow experiment as an example, in order to pursue scanning resolution when the pulsed nuclear magnetic resonance device scans the micro-scale flow experiment, the core sample size used is much smaller than the conventional oil layer physical core sample. The existing pulsed nuclear magnetic resonance device has a low maximum scanning voltage and weak radiation penetration ability. The conventional steel body clamp cannot meet the scanning requirements. At the same time, affected by the pressure and temperature during the core flow experiment, the core sample is prone to displacement, which makes the subsequent image calculation difficult, resulting in greatly limited experimental success rate and accuracy. Summary of the invention

[0004] The object of the present invention is to overcome the above-mentioned shortcomings of the prior art and to provide a pulsed nuclear magnetic resonance device for fluid characterization difference detection.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A pulsed nuclear magnetic resonance device for fluid characterization difference detection, comprising a workbench, a shell is arranged on the workbench, a mounting seat is plugged at one end of the shell, a protruding cylindrical portion of the mounting seat is located in the shell, a rubber sleeve is sleeved on the tail of the cylindrical portion, two inlets are arranged on the tail end surface of the cylindrical portion, an inlet is arranged on the side surface of the tail of the cylindrical portion, and the three inlets are connected to the outside through corresponding through holes respectively;

[0007] The rubber sleeve is used to install the core sample, one end of the core sample is in contact with the mounting seat, the other end of the core sample is provided with a first plug, the tail of the first plug extending out of the rubber sleeve is connected to a guide tube, the tail of the guide tube extending out of the housing is connected to a drainage joint through a second plug, and the drainage joint is connected to an external pipe through a third plug;

[0008] A through pipe is provided on the side wall of the second plug;

[0009] The cavity inside the shell constitutes a confining pressure cavity, and the inlet on the side of the tail of the cylindrical part is connected to the confining pressure cavity;

[0010] An objective lens and a radiation source are respectively arranged on the inner wall of the shell located on both sides of the core sample;

[0011] The external pipe is divided into two paths, one for exhaust and the other for liquid discharge;

[0012] The two inlets on the tail end surface of the cylindrical part are used for water intake and oil intake respectively; the inlet on the side surface of the tail of the cylindrical part is used for confining pressure liquid intake.

[0013] Furthermore, a sealing ring is provided at the connection between the second plug and the drain joint.

[0014] Furthermore, a heater is provided around the head of the cylindrical portion of the mounting seat.

[0015] Furthermore, a PLC temperature controller is fixedly provided on the outer wall of the shell, and the PLC temperature controller is electrically connected to the heater.

[0016] Furthermore, the external pipe is divided into two paths by a multi-way valve.

[0017] Furthermore, one path is connected to a back pressure control valve and a container, and the other path is connected to a vacuum pump through a first valve.

[0018] Furthermore, the through holes corresponding to the two inlets on the tail end face of the cylindrical part are respectively connected to the water tank and the oil tank, and the inlet on the side face of the tail of the cylindrical part is connected to a confining pressure pump.

[0019] Furthermore, a second valve is provided on the pipeline of the water tank.

[0020] A third valve is arranged on the pipeline of the oil storage tank.

[0021] Furthermore, a fourth plug is provided between the through pipe and the second plug.

[0022] Furthermore, the shell is made of alloy material.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention provides a pulsed nuclear magnetic resonance device for fluid characterization difference detection, which is formed by a shell and a sample containing mechanism therein. The rubber sleeve is located in the shell, and the core sample is located between the objective lens and the radiation source, so that the distance between the core sample and the objective lens and the radiation source becomes closer, the radiation capability is improved, the imaging quality is further improved, and the displacement of the core sample can be avoided as much as possible. The PLC temperature controller can control the heater, which can ensure that the constant temperature is always maintained during the implementation process.

[0025] Furthermore, the outer shell is made of alloy material, replacing the conventional steel material, which is more conducive to the penetration of laser and helps to improve the imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a top cross-sectional schematic diagram of the present invention;

[0028] Figure 3 It is a cross-sectional schematic diagram of the pulsed nuclear magnetic resonance device body of the present invention;

[0029] Figure 4 It is a schematic diagram of the structural installation of the sample containing mechanism of the present invention;

[0030] Figure 5 is a cross-sectional schematic diagram of the mounting base of the present invention;

[0031] Figure 6 It is a schematic diagram of the structural installation of the second plug, the drainage joint and the third plug of the present invention.

[0032] Among them: 1. workbench; 2. pulsed nuclear magnetic resonance device body; 3. water storage tank; 4. oil storage tank; 5. vacuum pump; 6. first valve; 7. back pressure control valve; 8. container; 9. multi-way valve; 10. PLC temperature controller; 11. second valve; 12. third valve; 13. confining pressure pump; 14. confining pressure control valve; 15. external pipe; 16. shell; 17. mounting seat; 18. objective lens; 19. ray source; 20. confining pressure chamber; 21. first plug; 22. rubber sleeve; 23. heater; 24. core sample; 25. second plug; 26. drainage joint; 27. third plug; 28. fourth plug; 29. ​​through pipe; 30. sealing ring; 31. guide pipe. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0036] like Figure 1-4 As shown, a pulsed nuclear magnetic resonance device for fluid characterization difference detection comprises a workbench 1, a pulsed nuclear magnetic resonance device body 2 is fixedly arranged on the top of the workbench 1, a mounting seat 17 is fixedly arranged on the inner side wall of the pulsed nuclear magnetic resonance device body 2, the mounting seat 17 is arranged in a "convex" shape, a shell 16 is fixedly sleeved on the top of the mounting seat 17, the shell 16 is made of alloy material instead of conventional steel material, which is beneficial to the penetration of laser and the improvement of imaging quality, a confining pressure chamber 20 is provided inside the shell 16, a rubber sleeve 22 is fixedly sleeved on the top of the mounting seat 17, a first plug 21 is fixedly arranged on the end of the rubber sleeve 22 away from the mounting seat 17, a core sample 24 is placed in the rubber sleeve 22, and the core sample 24 is located between the first plug 21 and the mounting seat 17, so that the placement of the rock core sample 24 is facilitated. The core sample 24, the inner side wall of the pulsed nuclear magnetic resonance device body 2 is fixedly provided with an objective lens 18 and a radiation source 19, and the objective lens 18 and the radiation source 19 are respectively located on both sides of the outer shell 16. By locating the outer shell 16 in the rubber sleeve 22, the core sample 24 is located between the objective lens 18 and the radiation source 19, so that the distance between the core sample 24 and the objective lens 18 and the radiation source 19 can be shortened, the radiation capability is improved, the imaging quality is further improved, and the displacement of the core sample is avoided. The top fixed sleeve of the mounting seat 17 is provided with a heater 23, and the side wall of the pulsed nuclear magnetic resonance device body 2 is fixedly provided with a PLC temperature controller 10. By electrically connecting the PLC temperature controller 10 with the heater 23, the heater 23 is located in the outer shell 16, so as to ensure as much as possible that a constant temperature condition is always maintained during the implementation process.

[0037] like Figure 1-5A water tank 3, an oil tank 4 and a confining pressure pump 13 are fixedly arranged on the top of the workbench 1. Two through holes with the same structure and corresponding distribution are opened on the top of the mounting seat 17. The inner wall of the top of the mounting seat 17 is connected with the water tank 3 and the oil tank 4 through two pipes with the same structure. A third valve 12 is fixedly sleeved on the pipe connecting the mounting seat 17 and the oil tank 4. A second valve 11 is fixedly sleeved on the pipe connecting the mounting seat 17 and the water tank 3. A through hole is opened on the side wall of the mounting seat 17. The inner wall and the confining pressure pump 13 are interconnected through a pipeline, and a confining pressure control valve 14 is fixedly sleeved on the pipeline connecting the mounting seat 17 and the confining pressure pump 13. By matching the two through holes on the top inner wall of the mounting seat 17 with one end of the two pipelines located on the top inner wall of the mounting seat 17, and matching the through holes on the inner wall of the mounting seat 17 with one end of the pipeline located on the inner wall of the mounting seat 17, oil and water can be injected into the core sample 24, so that the pulsed nuclear magnetic resonance device body 2 can detect the core sample 24.

[0038] like Figure 1-6 A second plug 25 is penetrated at one end of the housing 16 away from the mounting seat 17, a guide tube 31 is penetrated at the second plug 25, an end of the guide tube 31 away from the second plug 25 penetrates the housing 16 and is fixedly connected to the inner wall of the first plug 21 at one end inside the rubber sleeve 22, a drainage joint 26 is penetrated at the top of the second plug 25, a third plug 27 is fixedly disposed at one end of the drainage joint 26 away from the second plug 25, an end of the guide tube 31 located outside the housing 16 extends into the drainage joint 26, an end of the third plug 27 away from the drainage joint 26 is fixedly penetrated with an external pipe 15, an end of the external pipe 15 away from the third plug 27 penetrates a side of a pulsed nuclear magnetic resonance device body 2 adjacent thereto, and the external pipe 15 is located at one end of the pulsed nuclear magnetic resonance device body 2 and extends to the drainage joint 26, one end of the external pipe 15 located outside the pulsed nuclear magnetic resonance device body 2 is fixedly sleeved with a multi-way valve 9, a vacuum pump 5 and a container 8 are fixedly arranged on the top of the workbench 1, the vacuum pump 5 and the container 8 are interconnected with the multi-way valve 9 through a pipeline, a first valve 6 is fixedly sleeved on the pipeline connecting the multi-way valve 9 and the vacuum pump 5, a back pressure control valve 7 is fixedly sleeved on the pipeline connecting the multi-way valve 9 and the container 8, a through pipe 29 is fixedly penetrated through the side wall of the second plug 25, and a fourth plug 28 is fixedly arranged on the end of the through pipe 29 away from the second plug 25, by fixing a sealing ring 30 on the inner side wall of the second plug 25, and the sealing ring 30 and the drainage joint 26 are in contact with each other at one end located in the second plug 25, the imaging quality can be further improved, and the success rate and accuracy of the experiment can be improved.

[0039] The present invention opens the confining pressure control valve through the linkage setting of the liquid inlet mechanism and the exhaust and liquid discharge mechanism, injects the confining pressure liquid into the confining pressure chamber through the confining pressure pump, and when the confining pressure liquid flows out of the through pipe, seals the through pipe with a fourth plug, opens the vacuum pump, performs vacuum treatment on the core sample, so that the core sample maintains vacuum within a preset time, closes the first valve, opens the second valve, supplies water to the core sample with a water storage tank, sets the pressure of the back pressure control valve, and after the core is saturated with water, sets the parameters of the pulse nuclear magnetic resonance device body, obtains the internal pore structure of the core sample and the distribution of the water phase in the pores, closes the second valve, opens the third valve, sets the pressure of the back pressure control valve, and after the core sample is saturated with oil, ages the core sample according to the preset time required by the experiment, sets the parameters of the pulse nuclear magnetic resonance device body, obtains the internal pore structure of the core sample and the distribution of the oil phase in the pores, so as to facilitate the experimenter to conduct the experiment.

[0040] The present invention provides a pulsed nuclear magnetic resonance device for fluid characterization difference detection, and its working principle is as follows:

[0041] Fix the mounting base 17 in the pulsed nuclear magnetic resonance device, install the rubber sleeve 22 containing the core sample 24 on the base 17, install the first plug 21 and the flow guide tube 31, install the housing 16 on the mounting base 4, then install the second plug 25 and the drainage joint 26, connect the external pipe 15 to the drainage joint 26, then connect the vacuum pump 5 and the container 8 to different interfaces of the multi-way valve 9, and connect the multi-way valve 9 to the external pipe 15 to complete the installation;

[0042] Open the confining pressure control valve 14, inject the confining pressure liquid into the confining pressure chamber 20 through the confining pressure pump 13, and when the confining pressure liquid continuously flows out of the through pipe 29, seal it with the fourth plug 28, and then adjust the distance between the objective lens 18 and the radiation source 19 and the core sample 24 according to the scanning accuracy requirements, load the confining pressure according to the experimental requirements, and adjust the temperature of the heater 23 through the PLC temperature controller 10 according to the experimental requirements until the preset confining pressure is reached;

[0043] After the confining pressure reaches the experimental requirement, the confining pressure control valve 14 is closed, and the vacuum pump 5 is turned on to evacuate the core sample 24, and the core sample 24 is kept in vacuum for a preset time specified in the experiment;

[0044] Close the first valve 6, open the second valve 11, supply water to the core sample 24, set the pressure of the back pressure control valve 7, and after the core sample 24 is saturated with water, set the parameters of the pulsed nuclear magnetic resonance device body 2 to obtain nuclear magnetic resonance data to obtain the internal pore structure of the core sample 24 and the distribution of the water phase in the pores;

[0045] Then, the second valve 11 is closed, the third valve 12 is opened, and the pressure of the back pressure control valve 7 is set. After the core sample 24 is saturated with oil, the core sample 24 is aged according to the preset time required by the experiment, and the parameters of the pulsed nuclear magnetic resonance device body 2 are set to obtain nuclear magnetic resonance data to obtain the internal pore structure of the core sample 24 and the distribution of the oil phase in the pores, so as to facilitate the experimenters to conduct experiments.

[0046] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A pulsed nuclear magnetic resonance device for fluid characterization difference detection, characterized in that: The workbench (1) comprises a shell (16) on which the workbench (1) is provided, a mounting seat (17) is plugged at one end of the shell (16), a protruding cylindrical portion of the mounting seat (17) is located in the shell (16), a rubber sleeve (22) is sleeved on the tail of the cylindrical portion, two inlets are provided on the tail end surface of the cylindrical portion, an inlet is provided on the side surface of the tail of the cylindrical portion, and the three inlets are respectively connected to the outside through corresponding through holes; The rubber sleeve (22) is used to install a core sample (24), one end of the core sample (24) is in contact with the mounting seat (17), and the other end of the core sample (24) is provided with a first plug (21), the tail of the first plug (21) extending out of the rubber sleeve (22) is connected to a flow guide tube (31), the tail of the flow guide tube (31) extending out of the housing (16) is connected to a drainage joint (26) through a second plug (25), and the drainage joint (26) is connected to an external pipe (15) through a third plug (27); A through pipe (29) is provided on the side wall of the second plug (25); The cavity inside the shell (16) forms a confining pressure cavity (20), and the inlet on the side surface of the tail of the cylindrical part is connected to the confining pressure cavity (20); An objective lens (18) and a radiation source (19) are respectively provided on the inner wall of the housing (16) located on both sides of the core sample (24); The external pipe (15) is divided into two paths, one for exhaust and the other for liquid discharge; The two inlets on the tail end surface of the cylindrical part are used for water intake and oil intake respectively; the inlet on the side surface of the tail of the cylindrical part is used for confining pressure liquid intake.

2. The pulsed nuclear magnetic resonance device for fluid characterization difference detection according to claim 1, characterized in that: A sealing ring (30) is provided at the connection between the second plug (25) and the drain joint (26).

3. The pulsed nuclear magnetic resonance device for fluid characterization difference detection according to claim 1, characterized in that: A heater (4) is arranged around the head of the cylindrical part of the mounting seat (17).

4. The pulsed nuclear magnetic resonance device for fluid characterization difference detection according to claim 3, characterized in that: A PLC temperature controller (10) is fixedly mounted on the outer wall of the housing (16), and the PLC temperature controller (10) is electrically connected to the heater (23).

5. The pulsed nuclear magnetic resonance device for fluid characterization difference detection according to claim 1, characterized in that: The external pipe (15) is divided into two paths by a multi-way valve (9).

6. The pulsed nuclear magnetic resonance device for fluid characterization difference detection according to claim 5, characterized in that: One path is connected to a back pressure control valve (7) and a container (8), and the other path is connected to a vacuum pump (5) via a first valve (6).

7. The pulsed nuclear magnetic resonance device for fluid characterization difference detection according to claim 1, characterized in that: The through holes corresponding to the two inlets on the tail end surface of the cylindrical part are respectively connected to a water storage tank (3) and an oil storage tank (4), and the inlet on the side surface of the tail of the cylindrical part is connected to a confining pressure pump (13).

8. The pulsed nuclear magnetic resonance device for fluid characterization difference detection according to claim 1, characterized in that: A second valve (11) is provided on the pipeline of the water storage tank (3); A third valve (12) is provided on the pipeline of the oil storage tank (4).

9. The pulsed nuclear magnetic resonance device for fluid characterization difference detection according to claim 1, characterized in that: A fourth plug (28) is provided between the through pipe (29) and the second plug (25).

10. The pulsed nuclear magnetic resonance device for fluid characterization difference detection according to any one of claims 1 to 9, characterized in that: The shell (16) is made of alloy material.

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