High-temperature and high-pressure rock core testing device and method and application

Abstract

The invention discloses a high-temperature and high-pressure rock core testing device and method and application. The device comprises a pressure control mechanism, a drainage mechanism, a heating device, an observation device and a rock core accommodating bin, the core accommodating bin is suitable for accommodating cores; the drainage mechanism is suitable for inputting liquid into the rock core accommodating bin; the pressure control mechanism comprises an oil cylinder, a hydraulic pump, a hydraulic source, an energy accumulator and a gas cylinder; a piston is arranged in the oil cylinder, and the hydraulic pump can pump hydraulic oil into the oil cylinder to push the piston to pressurize the interior of the rock core accommodating bin; an air bag is arranged in the energy accumulator, the air bag is communicated with the air bottle, the energy accumulator is communicated with the oil cylinder, air in the air bottle can be introduced into the air bag so that hydraulic oil in the energy accumulator can be discharged into the oil cylinder, and the air in the air bag can be discharged so that the hydraulic oil in the oil cylinder can be sucked into the energy accumulator. The device comprehensively utilizes the advantages of high oil pressure pressurization speed and high air pressure regulation precision, the target pressure intensity is quickly and accurately achieved, and the high-temperature and high-pressure environment where the rock core is located is efficiently simulated.

Description

Technical Field

[0001] The present invention relates to the field of rock testing experiments, and in particular to a high-temperature and high-pressure core testing device, method and application. Background Art

[0002] As we all know, with the continuous excavation and exploitation of surface oil and gas fields, shallow oil and gas resources have become less and less, and people have begun to aim at deep oil and gas fields in the exploration of oil and gas resources. To study deep oil and gas fields, it is necessary to simulate the high temperature and high pressure environment deep underground. By detecting the changes in the physical properties of oil-bearing rocks under different pressure and temperature conditions, the formation, change and migration of oil reservoirs can be studied, and the data has important guiding significance for the development of oil and gas fields.

[0003] The oil and gas buried deep in the stratum is in a high temperature and high pressure environment, so when testing the characteristics of the core, it is also necessary to place it in a high temperature and high pressure environment for experiments. There are many instruments in the existing experimental equipment at home and abroad that can simulate the high temperature and high pressure environment and observe the characteristics of the core under high temperature and high pressure conditions, but there are still certain limitations. Summary of the invention

[0004] In order to enrich the product types of core testing devices under high temperature and high pressure conditions and increase the selection space of core testing methods under high temperature and high pressure conditions, an embodiment of the present invention provides a high temperature and high pressure core testing device, method and application.

[0005] In a first aspect, an embodiment of the present invention provides a high-temperature and high-pressure core testing device, including a pressure control mechanism, a drainage mechanism, a heating device, an observation device, and a core containing chamber;

[0006] The core containing chamber is suitable for containing cores;

[0007] The drainage mechanism is connected to the core containing chamber and is suitable for inputting liquid into the core containing chamber;

[0008] The pressure control mechanism includes an oil cylinder, a hydraulic pump, a hydraulic source, an accumulator and a gas cylinder;

[0009] The hydraulic source is connected to the hydraulic pump, a piston is arranged in the oil cylinder, the upper end of the oil cylinder is connected to the hydraulic pump, and the lower end of the oil cylinder is connected to the core containing chamber, and the hydraulic pump can pump hydraulic oil into the oil cylinder to push the piston to pressurize the core containing chamber;

[0010] An air bag is arranged in the accumulator, the air bag is connected to the gas cylinder, the accumulator is connected to the oil cylinder, the gas in the gas cylinder can pass into the air bag to discharge the hydraulic oil in the accumulator into the oil cylinder, and the gas in the air bag can be discharged to suck the hydraulic oil in the oil cylinder into the accumulator;

[0011] The heating device is disposed below the core containing chamber and is suitable for heating the core containing chamber;

[0012] The observation device is arranged at the side of the core containing chamber and is suitable for observing the core containing chamber.

[0013] In one or some optional embodiments, the high temperature and high pressure core testing device further includes an exhaust mechanism;

[0014] The exhaust mechanism includes a stop valve and an exhaust valve connected by pipelines;

[0015] The stop valve pipeline is connected to the upper part of the core containing chamber, and when the stop valve and the exhaust valve are in an open state, the gas in the core containing chamber can be discharged.

[0016] In one or some optional embodiments, the core containing chamber comprises an upper shell, a transparent window and a lower shell;

[0017] The transparent window is arranged between the upper shell and the lower shell.

[0018] In one or some optional embodiments, the observation device includes a light emitter and a macro camera;

[0019] The light emitter and the macro camera face the transparent window.

[0020] In one or some optional embodiments, a control valve is provided between the oil cylinder and the hydraulic pump;

[0021] The control valve is used to control the on-off of the fluid path between the oil cylinder and the hydraulic pump.

[0022] In one or some optional embodiments, a first pressure gauge is provided between the hydraulic pump and the control valve.

[0023] In one or some optional embodiments, the drainage mechanism includes a water tank, a filter, an electric pump, a high-pressure valve and an overflow valve;

[0024] The water tank, the filter screen, the electric pump, the high-pressure valve and the core containing chamber are connected in sequence by pipelines;

[0025] The overflow valve is connected to the outlet of the electric pump and the water tank respectively.

[0026] In one or some optional embodiments, the heating device includes an adjustable heating wire, an AC power supply, a switch, a temperature sensor and a fuse that are electrically connected in sequence.

[0027] In one or some optional embodiments, the high-temperature and high-pressure core testing device further includes a temperature and pressure sensor and a second pressure gauge connected to the core containing chamber.

[0028] In one or some optional embodiments, a charging valve is provided between the gas cylinder and the accumulator.

[0029] In a second aspect, an embodiment of the present invention provides a high temperature and high pressure core testing method, using the high temperature and high pressure core testing device described in the first aspect, comprising:

[0030] Place the core into the core holding chamber and turn on the observation device;

[0031] Filling the air bag with gas from the gas cylinder so that the air bag reaches a first preset pressure;

[0032] Injecting liquid into the core containing chamber through the drainage mechanism until the gas in the core containing chamber is completely discharged;

[0033] Pumping hydraulic oil into the oil cylinder through a hydraulic pump to push the piston downward to the bottom of the oil cylinder;

[0034] The core containing chamber is heated by a heating device so that the temperature in the core containing chamber reaches a preset temperature, and hydraulic oil is pumped into the oil cylinder by a hydraulic pump until the pressure in the core containing chamber reaches a second preset pressure;

[0035] The gas in the airbag is slowly released to suck the hydraulic oil in the oil cylinder into the accumulator, the pressure in the oil cylinder changes accordingly, the piston moves upward, the pressure in the core containing chamber slowly decreases, the core oil discharge is observed and recorded by the observation device, and the pressure at the time of core oil discharge is determined.

[0036] In a third aspect, an embodiment of the present invention provides an application of the high-temperature and high-pressure core testing device described in the first aspect in high-temperature and high-pressure core testing.

[0037] The beneficial effects of the above technical solution provided in the embodiments of the present invention include at least:

[0038] The high-temperature and high-pressure core testing device provided in the embodiment of the present invention heats the core containing chamber by a heating device so that the core containing chamber reaches a preset temperature, thereby simulating the high-temperature condition of the core, and can pressurize the core containing chamber by pumping hydraulic oil into the oil cylinder, and the hydraulic oil flows between the accumulator and the oil cylinder by inflating and deflating the air bag, so that the piston action accurately regulates the pressure in the core containing chamber, and comprehensively utilizes the advantages of fast oil pressure change, fast pressurization, slow air pressure change, and high pressure regulation accuracy, so as to achieve the target pressure quickly and accurately, efficiently simulate the high-temperature and high-pressure environment of the core, and can obtain the pressure difference of the core oil outlet point by releasing the gas in the accumulator after reaching the preset temperature and the preset pressure, which has great practical significance for the research and testing of core characteristics.

[0039] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0040] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0042] Figure 1 A schematic diagram of the structural principle of a high-temperature and high-pressure core testing device provided in an embodiment of the present invention;

[0043] Figure 2 A schematic diagram of the external structure of a high-temperature and high-pressure core testing device provided in an embodiment of the present invention;

[0044] Figure 3 The figure is a schematic flow chart of the high temperature and high pressure core testing method provided in an embodiment of the present invention.

[0045] In the figure:

[0046] 1 is a pressure control mechanism, 11 is a cylinder, 111 is a piston, 12 is a hydraulic pump, 13 is a hydraulic source, 14 is an accumulator, 141 is an air bag, 15 is a gas cylinder, 16 is a control valve, and 17 is a charging valve;

[0047] 2 is a drainage mechanism, 21 is a water tank, 22 is a filter screen, 23 is an electric pump, 24 is a high pressure valve, and 25 is a relief valve;

[0048] 3 is a heating device, 31 is an adjustable heating wire, 32 is an AC power supply, 33 is a switch, 34 is a temperature sensor, and 35 is a fuse;

[0049] 4 is an observation device, 41 is a light emitter, and 42 is a macro camera;

[0050] 5 is a core storage chamber, 51 is an upper shell, 52 is a transparent window, and 53 is a lower shell;

[0051] 6 is an exhaust mechanism, 61 is a stop valve, and 62 is an exhaust valve;

[0052] 7 is a first pressure gauge, 8 is a temperature and pressure sensor, and 9 is a second pressure gauge;

[0053] 100 is the core. DETAILED DESCRIPTION

[0054] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0055] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", "far", "near", "front", "back" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0056] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] The inventors have found that in existing high-temperature and high-pressure core experimental equipment, due to the complex internal pressure characteristics of the liquid, it is difficult to control the pressure adjustment in the high-temperature and high-pressure closed chamber, and the pressure adjustment accuracy is not high.

[0058] Based on this, an embodiment of the present invention provides a high temperature and high pressure core testing device, method and application, which are described in detail through specific embodiments below.

[0059] Embodiment 1

[0060] The embodiment of the present invention provides a high temperature and high pressure core testing device, referring to Figure 1 and Figure 2 As shown, it includes a pressure control mechanism 1, a drainage mechanism 2, a heating device 3, an observation device 4 and a core storage chamber 5;

[0061] The core containing chamber 5 is suitable for containing the core 100;

[0062] The drainage mechanism 2 is connected to the core containing chamber 5 and is suitable for inputting liquid into the core containing chamber 5;

[0063] The pressure control mechanism 1 includes an oil cylinder 11, a hydraulic pump 12, a hydraulic source 13, an accumulator 14 and a gas cylinder 15;

[0064] The hydraulic source 13 is connected to the hydraulic pump 12. A piston 111 is provided in the oil cylinder 11. The upper end of the oil cylinder 11 is connected to the hydraulic pump 12, and the lower end of the oil cylinder 11 is connected to the core containing chamber 5. The hydraulic pump 12 can pump hydraulic oil into the oil cylinder 11 to push the piston 111 to pressurize the core containing chamber 5.

[0065] An air bag 141 is provided in the accumulator 14, and the air bag 141 is connected to the gas cylinder 15. The accumulator 14 is connected to the oil cylinder 11. The gas in the gas cylinder 15 can flow into the air bag 141 to discharge the hydraulic oil in the accumulator 14 into the oil cylinder 11, and the gas in the air bag 141 can be discharged to suck the hydraulic oil in the oil cylinder 11 into the accumulator 14.

[0066] The heating device 3 is disposed below the core containing chamber 5 and is suitable for heating the core containing chamber 5;

[0067] The observation device 4 is disposed on the side of the core containing chamber 5 and is suitable for observing the core containing chamber 5 .

[0068] In the embodiment of the present invention, since the accumulator 14 is connected to the oil cylinder 11 up and down, the space between the accumulator 14 and the airbag 141 and the upper part of the piston 111 are filled with hydraulic oil. When gas is passed into the airbag 141 to expand the airbag 141, the hydraulic oil is discharged from the accumulator 14 into the oil cylinder 11, thereby pushing the piston 111 to move downward, thereby indirectly pressurizing the core containing chamber 5; when gas is discharged from the airbag 141 to shrink the airbag, the hydraulic oil in the oil cylinder 11 is sucked into the accumulator 14, and the pressure in the oil cylinder 11 is reduced accordingly, thereby causing the piston 111 to move upward, thereby indirectly releasing the pressure on the core containing chamber 5. The pressure control principle of the pressure control mechanism 1 provided in the embodiment of the present invention is that: due to the rapid change of hydraulic pressure, the hydraulic pump 12 can push the piston 111 to move downward quickly during the process of pumping the hydraulic oil in the hydraulic source 13 into the cylinder 11, thereby quickly pressurizing the core containing chamber 5, so that the pressure in the core containing chamber 5 quickly reaches the target pressure value, while the air pressure changes slowly. During the process of inflating the airbag 141 or releasing the gas in the airbag 141, the hydraulic oil flows between the cylinder 11 and the accumulator 14, so that the piston 111 moves slowly, thereby realizing precise pressure regulation of the core containing chamber 5.

[0069] In the embodiment of the present invention, the gas used for pressure regulation stored in the gas cylinder 15 is nitrogen. Since nitrogen has a large compression space, accurate pressure regulation can be achieved by charging and discharging nitrogen. The inventors have obtained through experiments that when the core storage chamber 5 is under high temperature and high pressure conditions, the pressure in the core storage chamber 5 can be accurately fine-tuned by charging or discharging nitrogen, and the adjustment accuracy can reach 0.01Mpa. Obviously, the gas used for pressure regulation is not limited to nitrogen, but can also be other gases, as long as it can achieve pressure fine-tuning, and no limitation is made here.

[0070] In the embodiment of the present invention, refer to Figure 1 As shown, a control valve 16 is provided between the oil cylinder 11 and the hydraulic pump 12 , and the control valve 16 can control the on-off of the fluid path between the hydraulic pump 12 and the oil cylinder 11 .

[0071] In a specific embodiment, an inflation valve 17 is provided between the gas cylinder 15 and the airbag 141 , and the inflation valve 17 can control the on-off of the pipeline between the gas cylinder 15 and the airbag 141 . When the inflation valve 17 is opened, the gas in the gas cylinder 15 can flow into the airbag 141 .

[0072] In a specific embodiment, referring to Figure 1 and Figure 2As shown, the core storage chamber 5 may include an upper shell 51, a transparent window 52 and a lower shell 53 which are sequentially arranged up and down. The transparent window 52 is arranged between the upper shell 51 and the lower shell 53. When the core 100 is accommodated in the core storage chamber 5, the shape of the core 100 can be observed through the transparent window 52. The upper shell 51, the transparent window 52 and the lower shell 53 all have good thermal conductivity. The core storage chamber 5 can be heated and heated by the heating device 3 to simulate the high temperature conditions around the core 100.

[0073] In a specific embodiment, referring to Figure 1 and Figure 2 As shown, the high temperature and high pressure core testing device may further include an exhaust mechanism 6, which is connected to the upper part of the core containing chamber 5, and the gas in the core containing chamber 5 can be discharged through the exhaust mechanism 6. The exhaust mechanism 6 includes a stop valve 61 and an exhaust valve 62 connected by pipelines, and the stop valve 61 is connected to the upper shell 51 of the core containing chamber 5 by pipelines. When the stop valve 61 and the exhaust valve 62 are opened at the same time, the gas in the core containing chamber 5 can be discharged.

[0074] In a specific embodiment, referring to Figure 1 and Figure 2 As shown, the drainage mechanism 2 may include a water tank 21, a filter screen 22, an electric pump 23, a high-pressure valve 24, and an overflow valve 25. The water tank 21, the filter screen 22, the electric pump 23, the high-pressure valve 24, and the core storage chamber 5 are connected in sequence by pipelines. The electric pump 23 can pump water in the water tank 21 into the core storage chamber 5. When the core storage chamber 5 contains the core 100, the liquid discharged into the core storage chamber 5 by the drainage mechanism 2 displaces the gas in the core storage chamber 5, and the liquid enters the lower part of the piston 111 in the oil cylinder 11, so that when the piston 111 moves, the pressure in the core storage chamber 5 changes significantly. In this embodiment, the purpose of injecting liquid into the core storage chamber 5 to displace the gas is to better pressurize, so as to simulate the high temperature and high pressure around the core 100.

[0075] In a specific embodiment, referring to Figure 1 and Figure 2 As shown, the filter screen 22 is arranged at the outlet of the water tank 21, and is used to filter the liquid flowing out of the water tank 21, so as to prevent impurities in the liquid from entering the pipeline, causing blockage and damage to the equipment and pipeline. The high-pressure valve 24 is used to control the on-off of the pipeline between the electric pump 23 and the core storage chamber 5. When the high-pressure valve 24 is opened, the electric pump 23 can pump liquid into the core storage chamber 5. The overflow valve 25 is connected to the outlet of the electric pump 23 and the water tank 21 respectively. When the high-pressure valve 24 reaches the preset pressure threshold, the overflow valve 25 opens to discharge the liquid, thereby ensuring that the pipeline pressure is within the preset pressure range, and ensuring the safe and stable operation of the pipeline and equipment.

[0076] In a specific embodiment, referring to Figure 1and Figure 2 As shown, the heating device 3 can use a PWM controlled heater, including an adjustable heating wire 31, an AC power supply 32, a switch 33, a temperature sensor 34 and a fuse 35 electrically connected in sequence. The size of the AC power can be adjusted by the switch 33, so as to achieve the purpose of temperature regulation. The lower shell 53 of the core storage chamber 5 is heated by the PWM controlled heater, so that the temperature in the lithology storage chamber is increased to the target temperature value, thereby simulating the high temperature environment of the core 100. Obviously, the heating device 3 is not limited to the above-mentioned PWM controlled heater, and other heating and temperature raising equipment can also be used. For details, please refer to the detailed records of the prior art, which will not be repeated here.

[0077] In a specific embodiment, referring to Figure 1 As shown, the observation device 4 includes a light emitter 41 and a macro camera 42 facing the transparent window 52. The light emitter 41 emits light to illuminate the core 100 in the transparent window 52, ​​and the macro camera 42 takes pictures of the situation in the transparent window 52 and stores them. The picture taken by the macro camera 42 can be used to observe the changes of the core 100 in the core storage chamber 5. The observation device 4 can capture and record the process of the morphological change of the core 100, and the temperature and temperature in the core storage chamber 5 can be continuously monitored by the temperature and pressure sensor 8; the light emitter 41 can output ultraviolet light to accurately observe the oil output of the core 100.

[0078] The high-temperature and high-pressure core testing device provided in the embodiment of the present invention pressurizes and heats the core containing chamber by cooperating with the pressure control mechanism 1 and the heating device 3, so that the core containing chamber 5 can simulate the high-temperature and high-pressure environment of the core 100, and then test the core 100 under high-temperature and high-pressure conditions.

[0079] In a specific embodiment, referring to Figure 1 As shown, a first pressure gauge 7 is provided between the hydraulic pump 12 and the control valve 16, through which the pressure on the upper part of the first piston 111 in the oil cylinder 11 can be monitored. When the pressure is too high, the pumping oil is stopped to ensure safe operation.

[0080] In a specific embodiment, referring to Figure 1 As shown, the high temperature and high pressure core testing device also includes a temperature and pressure sensor 8 and a second pressure gauge 9 connected to the core containing chamber 5. The temperature and pressure sensor 8 can monitor the temperature and pressure in the core containing chamber 5 in real time to determine whether the pressure in the core containing chamber 5 reaches the target temperature and target pressure, and perform heating and pressurizing operations accordingly. The second pressure gauge 9 is a mechanical pressure gauge, which can also monitor the pressure in the core containing chamber 5 in real time, cooperate with the temperature and pressure sensor 8, play a role of calibration and insurance, and detect abnormal conditions in time.

[0081] In the embodiment of the present invention, the process of using the high temperature and high pressure core testing device to test the core 100 under high temperature and high pressure conditions may specifically include:

[0082] The gas in the gas cylinder 15 is introduced into the airbag 141 in advance to expand the airbag 141. The pressure on the upper part of the second piston 141 in the accumulator 14 is roughly consistent with the pressure in the space where the core is located during the experiment. The purpose of pre-inflation is to generate a sufficient pressure difference between the core containing chamber 5 and the outside world when the gas in the accumulator 14 is released;

[0083] Fix the core 100 in the core containing chamber 5, and use screws to press the upper and lower shells 53 and the transparent window 52 tightly to ensure the airtightness of the core containing chamber 5;

[0084] The liquid is discharged from the water tank 21 into the core storage chamber 5 by the electric pump 23 until no more gas is discharged from the exhaust mechanism 6, and then the stop valve 61 and the high-pressure valve 24 are closed successively. If there are bubbles stuck in the core storage chamber 5, the core storage chamber 5 can be shaken to ensure that the gas is completely discharged;

[0085] The hydraulic oil is pumped into the upper part of the oil cylinder 11 by the hydraulic pump 12 until the piston 111 in the oil cylinder 11 is pressed down to the bottom of the oil cylinder 11;

[0086] The heating device 3 is started to heat the internal temperature of the shell to a preset temperature. After the liquid expands due to heat and lifts the piston 111, the hydraulic oil is continuously pumped into the upper part of the cylinder 11 through the hydraulic pump 12, so that the piston 111 moves downward under the action of the oil pressure, and the internal pressure of the shell is pressurized to a preset pressure, thereby simulating the high temperature and high pressure environment in the core storage chamber 5;

[0087] The nitrogen in the airbag 141 is slowly released. At this time, the pressure in the airbag 141 drops and it starts to shrink. The hydraulic oil in the oil cylinder 11 is sucked into the accumulator 14. The oil pressure in the oil cylinder 11 changes accordingly, and the piston 111 moves upward, which indirectly reduces the pressure in the core storage chamber 5. During the nitrogen release process, the core 100 is continuously observed by the observation device 4 until oil and gas are precipitated from the core 100 under the condition of the internal and external pressure difference. The pressure when oil and gas are precipitated is recorded to obtain the pressure of the oil outlet point.

[0088] The high-temperature and high-pressure core testing device provided in the embodiment of the present invention heats the core containing chamber 5 through the heating device 3 so that the core containing chamber 5 reaches a preset temperature, thereby simulating the high-temperature condition of the core, and can pressurize the core containing chamber 5 by pumping hydraulic oil into the oil cylinder 11, and can accurately adjust the pressure in the core containing chamber 5 by inflating and deflating the air bag 141, and comprehensively utilizes the advantages of fast oil pressure change, fast pressurization, slow air pressure change, and high pressure regulation accuracy, so as to achieve the target pressure quickly and accurately, efficiently simulate the high-temperature and high-pressure environment of the core 100, and can obtain the pressure of the oil outlet point of the core 100 by releasing the gas in the air bag 141 after reaching the preset temperature and the preset pressure, which has great practical significance for the research and testing of the characteristics of the core 100.

[0089] Embodiment 2

[0090] Based on the same inventive concept, an embodiment of the present invention further provides a high temperature and high pressure core testing method, using the high temperature and high pressure core testing device described in embodiment 1, comprising:

[0091] S101: placing the core 100 into the core containing chamber 5 and opening the observation device 4;

[0092] S102: Filling the gas in the gas cylinder 15 into the airbag 141 so that the airbag 141 reaches a first preset pressure;

[0093] S103: Liquid is input into the core containing chamber 5 through the drainage mechanism 2 until the gas in the core containing chamber 5 is completely discharged;

[0094] S104: Pumping hydraulic oil into the oil cylinder 11 through the hydraulic pump 12 to push the piston 111 downward to the bottom of the oil cylinder 11;

[0095] S105: heating the core containing chamber 5 by the heating device 3 so that the temperature in the core containing chamber 5 reaches a preset temperature, and pumping hydraulic oil into the oil cylinder 11 by the hydraulic pump 12 until the pressure in the core containing chamber 5 reaches a second preset pressure;

[0096] S106: The gas in the airbag 141 is slowly released to suck the hydraulic oil in the oil cylinder 11 into the accumulator 14. The pressure in the oil cylinder 11 changes accordingly, the piston moves upward, and the pressure in the core containing chamber 5 decreases slowly. The oil discharge of the core 100 is observed and recorded by the observation device 4 to determine the pressure of the core 100 at the time of oil discharge.

[0097] In the embodiment of the present invention, the high temperature and high pressure core testing method corresponds to the high temperature and high pressure core testing device described in Example 1. Its specific implementation process can refer to the process of using the high temperature and high pressure core testing device to implement high temperature and high pressure core testing in Example 1. The repeated parts will not be repeated here.

[0098] Embodiment 3

[0099] Based on the same inventive concept, an embodiment of the present invention further provides an application of the high-temperature and high-pressure core testing device described in Embodiment 1 in high-temperature and high-pressure core testing.

[0100] In the embodiment of the present invention, the specific process of using the high temperature and high pressure core testing device to implement high temperature and high pressure core testing can refer to the process of using the high temperature and high pressure core testing device to implement high temperature and high pressure core testing in Example 1, and the repeated parts will not be repeated here.

[0101] Obviously, various changes and modifications may be made to the present invention by those skilled in the art without departing from the spirit and scope of the present invention. The present disclosure is not limited to the precise structure described above and shown in the accompanying drawings, and various changes and modifications may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims. Thus, if these changes and modifications of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these changes and modifications.

Claims

1. A high temperature and high pressure core testing device, characterized in that: It includes a pressure control mechanism, a drainage mechanism, a heating device, an observation device and a core holding chamber; The core containing chamber is suitable for containing cores; The drainage mechanism is connected to the core containing chamber and is suitable for inputting liquid into the core containing chamber; The pressure control mechanism includes an oil cylinder, a hydraulic pump, a hydraulic source, an accumulator and a gas cylinder; The hydraulic source is connected to the hydraulic pump, a piston is arranged in the oil cylinder, the upper end of the oil cylinder is connected to the hydraulic pump, and the lower end of the oil cylinder is connected to the core containing chamber, and the hydraulic pump can pump hydraulic oil into the oil cylinder to push the piston to pressurize the core containing chamber; An air bag is arranged in the accumulator, the air bag is connected to the gas cylinder, the accumulator is connected to the oil cylinder, the gas in the gas cylinder can pass into the air bag to discharge the hydraulic oil in the accumulator into the oil cylinder, and the gas in the air bag can be discharged to suck the hydraulic oil in the oil cylinder into the accumulator; The heating device is disposed below the core containing chamber and is suitable for heating the core containing chamber; The observation device is arranged at the side of the core containing chamber and is suitable for observing the core containing chamber.

2. The high temperature and high pressure core testing device according to claim 1, characterized in that: The high temperature and high pressure core testing device also includes an exhaust mechanism; The exhaust mechanism includes a stop valve and an exhaust valve connected by pipelines; The stop valve pipeline is connected to the upper part of the core containing chamber, and when the stop valve and the exhaust valve are in an open state, the gas in the core containing chamber can be discharged.

3. The high temperature and high pressure core testing device according to claim 1, characterized in that: The core containing chamber comprises an upper shell, a transparent window and a lower shell; The transparent window is arranged between the upper shell and the lower shell.

4. The high temperature and high pressure core testing device according to claim 3, characterized in that: The observation device includes a light emitter and a macro camera; The light emitter and the macro camera face the transparent window.

5. The high temperature and high pressure core testing device according to claim 1, characterized in that: A control valve is provided between the oil cylinder and the hydraulic pump; The control valve is used to control the on-off of the fluid path between the oil cylinder and the hydraulic pump.

6. The high temperature and high pressure core testing device according to claim 5, characterized in that: A first pressure gauge is provided between the hydraulic pump and the control valve.

7. The high temperature and high pressure core testing device according to claim 1, characterized in that: The drainage mechanism includes a water tank, a filter, an electric pump, a high-pressure valve and a relief valve; The water tank, the filter screen, the electric pump, the high-pressure valve and the core containing chamber are connected in sequence by pipelines; The overflow valve is connected to the outlet of the electric pump and the water tank respectively.

8. The high temperature and high pressure core testing device according to claim 1, characterized in that: The heating device comprises an adjustable heating wire, an AC power supply, a switch, a temperature sensor and a fuse which are electrically connected in sequence.

9. The high temperature and high pressure core testing device according to claim 1, characterized in that: The high-temperature and high-pressure core testing device further includes a temperature and pressure sensor and a second pressure gauge communicated with the core containing chamber.

10. The high temperature and high pressure core testing device according to claim 1, characterized in that: A charging valve is arranged between the gas cylinder and the accumulator.

11. A high temperature and high pressure core testing method, using the high temperature and high pressure core testing device according to any one of claims 1 to 10, characterized in that: include: Place the core into the core holding chamber and turn on the observation device; Filling the air bag with gas from the gas cylinder so that the air bag reaches a first preset pressure; Injecting liquid into the core containing chamber through the drainage mechanism until the gas in the core containing chamber is completely discharged; Pumping hydraulic oil into the oil cylinder through a hydraulic pump to push the piston downward to the bottom of the oil cylinder; The core containing chamber is heated by a heating device so that the temperature in the core containing chamber reaches a preset temperature, and hydraulic oil is pumped into the oil cylinder by a hydraulic pump until the pressure in the core containing chamber reaches a second preset pressure; The gas in the airbag is slowly released to suck the hydraulic oil in the oil cylinder into the accumulator, the pressure in the oil cylinder changes accordingly, the piston moves upward, the pressure in the core containing chamber slowly decreases, the core oil discharge is observed and recorded by the observation device, and the pressure at the time of core oil discharge is determined.

12. Use of the high temperature and high pressure core testing device according to any one of claims 1 to 10 in high temperature and high pressure core testing.

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