CN113670778A

CN113670778A - Shale imbibition experimental apparatus of magnetic suspension measurement

Info

Publication number: CN113670778A
Application number: CN202110989756.3A
Authority: CN
Inventors: 苏玉亮; 孙庆豪; 王文东; 郝永卯; 李蕾; 赵坤; 郭新成; 桑茜; 董明哲
Original assignee: China University of Petroleum East China
Current assignee: China University of Petroleum East China
Priority date: 2021-08-26
Filing date: 2021-08-26
Publication date: 2021-11-19
Anticipated expiration: 2041-08-26
Also published as: CN113670778B

Abstract

The embodiment of the application provides a shale imbibition experimental apparatus of magnetic suspension measurement. The device comprises: the imbibition displacement system is used for providing a place for carrying out imbibition displacement on fluid in a rock core by working fluid so as to simulate a fracturing fluid imbibition displacement process in a continental shale oil tight well drainage and production process; the magnetic suspension lifting metering system is used for lifting the rock core by utilizing magnetic attraction and metering the weight of the rock core by utilizing magnetic repulsion; and the data acquisition and processing system is used for recording the weight of the sample after imbibition and replacement in real time. The shale imbibition experimental apparatus of magnetic suspension measurement can monitor and real-time measurement sample's weight in succession, increases substantially the measuring accuracy, and the human cost reduces and the device of adoption is also comparatively simple and convenient. Meanwhile, in a shale imbibition experiment under the high-temperature and high-pressure conditions, the process of imbibition and replacement of crude oil in shale by fracturing fluid under the stratum conditions can be better simulated, and the method has a certain reference function for further researching the development of deep shale oil resources.

Description

Shale imbibition experimental apparatus of magnetic suspension measurement

Technical Field

The application relates to the technical field of unconventional shale oil resource development, in particular to a shale imbibition experimental device for magnetic suspension measurement.

Background

In the technical field of unconventional shale oil resource development, a core imbibition device such as an imbibition bottle normal-pressure imbibition device, a balance method normal-pressure imbibition device, a core holder high-pressure imbibition device and the like is often adopted to produce crude oil, but the existing core imbibition device has the defects of incapability of realizing real-time measurement, low prediction precision, single imbibition mode and the like under the conditions of high temperature and high pressure, and is difficult to be suitable for shale imbibition experiments under the conditions of high temperature and high pressure.

Disclosure of Invention

The purpose of the embodiment of the application is to provide a shale imbibition experimental apparatus for magnetic suspension measurement.

In order to achieve the above object, a first aspect of the present application provides a shale imbibition experimental apparatus with magnetic suspension metering, including:

the imbibition displacement system is used for providing a place for carrying out imbibition displacement on fluid in a rock core by working fluid so as to simulate a fracturing fluid imbibition displacement process in a continental shale oil tight well drainage process, the imbibition displacement system comprises a sample (23) and a sample suspension bracket (24), and the sample (23) is positioned on the sample suspension bracket (24);

magnetic suspension goes up and down to measure system for utilize magnetic attraction to carry out the rock core and go up and down and utilize magnetic repulsion to carry out the measurement of rock core weight, magnetic suspension goes up and down to measure system includes: the device comprises a first suspension line (12), a suspension bracket (13), an inner permanent magnet (17), a second suspension line (18), a titanium alloy pipe column (19), a third suspension line (20) and an outer permanent magnet (21);

the outer permanent magnet (21) is positioned outside the titanium alloy pipe column (19) and connected with the suspension bracket (13) through a third suspension line (20), the inner permanent magnet (17) is positioned inside the titanium alloy pipe column (19), the second suspension line (18) is connected with the sample suspension bracket (24), the sample (23) is suspended below the inner permanent magnet (17) through the sample suspension bracket (24), the outer permanent magnet (21) and the inner permanent magnet (17) repel each other, and the magnetic field force between the inner permanent magnet (17) and the outer permanent magnet (21) changes according to the weight of the sample (23);

the data acquisition and processing system is used for recording the weight of the sample (23) after imbibition and displacement in real time and comprises an electronic balance (11), the electronic balance (11) is connected with a suspension bracket (13) through a first suspension line (12), and the weight of the sample (23), the sample suspension bracket (24) and an inner permanent magnet (17) is transmitted to the electronic balance (11) through the suspension line (12) under the coupling action of magnetic field force so as to monitor the change condition of the weight of the sample (23) through the electronic balance (11).

Above-mentioned technical scheme utilizes magnetic suspension lift measurement system can continuous monitoring and real-time measurement sample's weight, increases substantially the measuring accuracy of imbibition experiment, and the human cost reduces and the device of adoption is also comparatively simple and convenient, simultaneously, can be used to shale imbibition experiment under normal atmospheric temperature, the high temperature and high pressure condition, is applicable to single face contact, full contact's shale imbibition experiment, can simulate real oil reservoir condition better. Particularly, in a shale imbibition experiment under the high-temperature and high-pressure conditions, the method can better simulate the imbibition and replacement process of the fracturing fluid on crude oil in the shale under the stratum conditions, and has a certain reference function for further researching the development of deep shale oil resources.

Additional features and advantages of embodiments of the present application will be described in detail in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the embodiments of the disclosure, but are not intended to limit the embodiments of the disclosure. In the drawings:

fig. 1 schematically shows a structural block diagram of a shale imbibition experimental facility for magnetic suspension metering according to an embodiment of the application;

fig. 2A schematically illustrates an experimental process variation of a magnetically suspended metered shale imbibition experimental apparatus according to an embodiment of the present application;

fig. 2B schematically illustrates an experimental process variation of a magnetically suspended metered shale imbibition experimental apparatus according to an embodiment of the present application;

FIG. 3 schematically illustrates a flow chart of an imbibition experimental method according to an embodiment of the application;

FIG. 4 is a graph schematically illustrating the imbibition efficiency of a shale imbibition experimental method of magnetic levitation metrology according to an embodiment of the application;

fig. 5 schematically shows an internal structure diagram of a computer device according to an embodiment of the present application.

Reference numerals

1 gas cylinder, 2 pressure reducing valve and 3 third pressure gauge

4 second two-way valve 5 third two-way valve 6 first pressure gauge

7 first two-way valve 8 second pressure gauge 9 pressure sensor

10 computer 11 high-precision electronic balance 12 suspension line

13 hanging bracket 14 electromagnet 15 slide rheostat

Permanent magnet 18 suspension wire in 16-circuit switch 17

19 titanium alloy pipe column 20 suspension line 21 external permanent magnet

22 titanium alloy infiltration absorption kettle cover 23 sample 24 sample suspension bracket

25 glass window 26 temperature control instrument 27 second electric heating jacket

28 piston container 29 hand pump 30 safety valve

31 gas blow-down valve 32 temperature control instrument 33 temperature sensor

34 first electric heating jacket 35 stainless steel infiltration absorption kettle body 36 magnetic stirring motor

37 horizontal support 38 liquid blow-off valve 39 fourth two-way valve

40 liquid cup

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it should be understood that the specific embodiments described herein are only used for illustrating and explaining the embodiments of the present application and are not used for limiting the embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The structure of the shale imbibition experimental device for magnetic suspension measurement is shown in figure 1.

In one embodiment, as shown in fig. 1, a shale imbibition experimental device for magnetic suspension measurement is provided, which includes an imbibition displacement system module, a magnetic suspension lifting measurement system module, and a data acquisition and processing system module, wherein:

the seepage and displacement system module 100 is used for providing a place for seepage and displacement of fluid in a rock core by working fluid so as to simulate a fracturing fluid seepage and displacement process in a continental shale oil tight well drainage and production process, the seepage and displacement system comprises a sample (23) and a sample suspension bracket (24), and the sample (23) is positioned on the sample suspension bracket (24);

magnetic suspension lift measurement system module 200 for utilize magnetic attraction to carry out the rock core and go up and down and utilize magnetic repulsion to carry out the measurement of rock core weight, magnetic suspension lift measurement system includes: the device comprises a first suspension line (12), a suspension bracket (13), an inner permanent magnet (17), a second suspension line (18), a titanium alloy pipe column (19), a third suspension line (20) and an outer permanent magnet (21); the outer permanent magnet (21) is positioned outside the titanium alloy pipe column (19) and connected with the suspension bracket (13) through a third suspension line (20), the inner permanent magnet (17) is positioned inside the titanium alloy pipe column (19), the second suspension line (18) is connected with the sample suspension bracket (24), the sample (23) is suspended below the inner permanent magnet (17) through the sample suspension bracket (24), the outer permanent magnet (21) and the inner permanent magnet (17) repel each other, and the magnetic field force between the inner permanent magnet (17) and the outer permanent magnet (21) changes according to the weight of the sample (23);

the data acquisition and processing system module 300 is used for recording the weight of the sample (23) after imbibition and displacement in real time, and comprises an electronic balance (11), wherein the electronic balance (11) is connected with a suspension bracket (13) through a first suspension line (12), and the weights of the sample (23), the sample suspension bracket (24) and an inner permanent magnet (17) are transmitted to the electronic balance (11) through the suspension line (12) under the coupling action of magnetic field force so as to monitor the change condition of the weight of the sample (23) through the electronic balance (11).

In one embodiment, as shown in fig. 1, the magnetic levitation lift metering system further comprises an electromagnet (14), a slide rheostat (15) and a circuit switch (16), wherein the electromagnet (14) is fixed above the outside of the titanium alloy pipe column (19), a first end of the slide rheostat (15) is connected in series with the circuit switch (16), and a second end of the slide rheostat (15) is connected with the electromagnet (14).

In one embodiment, as shown in fig. 1, the data acquisition and processing system further includes a computer (10), and the shale imbibition experimental device for magnetic suspension measurement further includes a digital display meter for transmitting the temperature value detected by the temperature sensor (33) and the pressure value detected by the pressure sensor (9) to the computer (10).

The imbibition displacement system module 100 can provide a place for imbibition displacement of fluid in a core by working fluid so as to simulate a fracturing fluid imbibition displacement process in a continental facies shale oil tight well drainage process. The working fluid refers to fracturing fluid in the shale oil tight well drainage and production process, the sample refers to a shale core sample, the sample can be a cylindrical regular shale sample or an irregular shale sample, the shale sample can be subjected to first weight test of the shale sample after oil washing and drying, the second weight test of the shale sample after saturated crude oil treatment is carried out, meanwhile, the shale sample also needs to be subjected to surface treatment, and specifically, at least one of three modes of surface unsealing, annular sealing and top surface sealing can be selected. In addition, the shale sample imbibition mode can be any one of full-contact reverse spontaneous imbibition, forward spontaneous imbibition and single-side contact spontaneous imbibition. The magnetic levitation lifting metering system module 200 can utilize magnetic attraction force to lift the core and magnetic repulsion force to measure the weight of the core. The core rising can mean that a sample is placed at the upper part of the imbibition kettle and can be represented as being above the position 1/2 of the imbibition kettle, the core falling can mean that the sample is placed at the lower part of the imbibition kettle and can be represented as being below the position 1/2 of the imbibition kettle or submerged in working solution, the magnetic attraction force means the force generated by mutual attraction between an electromagnet (14) above a titanium alloy pipe column (19) and an inner permanent magnet (17) when the electromagnet is electrified, and the magnetic repulsion force means the force generated by mutual repulsion between the outer permanent magnet (21) and the inner permanent magnet (17). Specifically, in one embodiment, the titanium alloy pipe column (19) is hermetically connected with the titanium alloy infiltration kettle cover (22) through threads, and the compressive strength of the titanium alloy pipe column (19) is 50 MPa. The data acquisition and processing system module 300 can record the weight of the sample (23) after imbibition and replacement in real time, wherein the weight data of the sample after imbibition and replacement can be measured through an electronic balance, and the change condition of the weight of the sample after imbibition and replacement can be monitored through the electronic balance. Specifically, in one embodiment, the electronic balance may be a high-precision electronic balance, the high-precision electronic balance may be an electronic balance with a measuring range of 220g and a precision of 0.001g, and the electronic balance may be an electronic balance with a data transmission function.

The shale imbibition experimental apparatus of magnetic suspension measurement can be applicable to the shale imbibition experiment of different imbibition directions, and the device leakproofness is better, is difficult for receiving the environmental impact. The magnetic suspension lifting metering system realizes the non-contact lifting control of the sample position, can transfer the sample weight to the electronic balance in a non-contact way, separates the sample environment from the measuring environment, has high metering precision and can continuously monitor in real time. The imbibition replacement system is used as the core of the whole device and as a place for carrying out imbibition replacement on fluid in the rock core by using working fluid, and can better simulate the imbibition replacement process of crude oil in the shale by using fracturing fluid. The data acquisition and processing system utilizes a high-precision electronic balance to measure and monitor the weight of the sample after imbibition and replacement in real time, so that the metering precision is improved, and the labor cost and human errors are reduced.

In one embodiment, as shown in fig. 1, the shale imbibition experimental device with magnetic suspension metering further includes a temperature and pressure coordination control system module 400, the temperature and pressure coordination control system includes a gas cylinder (1), a piston container (28) and a first electric heating jacket (34), the gas cylinder (1) is used for providing a high-pressure environment of 50MPa for the imbibition reactor through the piston container (28), and the first electric heating jacket (34) is used for providing a high-temperature environment of 150 ℃ for the imbibition reactor and the piston container (28).

The infiltration absorption kettle can be composed of a titanium alloy infiltration absorption kettle cover and a stainless steel infiltration absorption kettle body, gas provided by the gas cylinder is pressurized gas, specifically, the pressurized gas provided by the gas cylinder can be nitrogen, and the pressurized gas can be injected into the upper part of the infiltration absorption kettle by using a hand pump.

Further, in an embodiment, as shown in fig. 1, the coordinated temperature and pressure control system further includes a first pressure gauge (6), a first two-way valve (7), a second pressure gauge (8), a hand pump (29), and a first temperature control instrument (32); the data acquisition and processing system is also used for acquiring pressure data of the imbibition displacement system and also comprises a pressure sensor (9); the first end of a first pressure gauge (6) is connected with the first end of a first two-way valve (7), the second end of the first pressure gauge (6) is connected with a piston container (28), the second end of the first two-way valve (7) is connected with the first end of a second pressure gauge (8), the second end of the second pressure gauge (8) is connected with the first end of a pressure sensor (9), the second end of the pressure sensor (9) is connected with a stainless steel infiltration kettle body (35), and a first temperature control instrument (32) is connected with a first electric heating sleeve (34); pressurizing gas in a piston container (28), injecting the gas into the upper part of the infiltration kettle by using a hand pump (29), and controlling the air pressure in the infiltration kettle to reach the preset gas injection pressure by using a pressure sensor (9); the temperature of the first electric heating sleeve (34) is controlled by the first temperature control instrument (32) so as to control the first electric heating sleeve (34) to heat the fluid in the imbibition kettle to a preset experimental temperature.

The pressure data refers to the pressure of gas injection achieved by the imbibition kettle and the experimental pressure achieved in the imbibition kettle, the pressure data can be collected through a data acquisition and processing system, and the data can be transmitted to computer software through a professional digital display instrument and stored. Specifically, the hand pump can be used for injecting gas into the upper part of the infiltration kettle, and the gas pressure in the infiltration kettle is controlled by the control pressure sensor (9) to reach the preset gas injection pressure, wherein the gas injected into the upper part of the infiltration kettle can be nitrogen, and the preset gas injection pressure can be the preset nitrogen injection pressure. When the first temperature control instrument (32) controls the temperature of the first electric heating sleeve to control the first electric heating sleeve (34) to heat the fluid in the imbibition kettle to a preset experimental temperature, the nitrogen injected into the imbibition kettle increases the pressure per se along with the rise of the temperature of the imbibition kettle, the preset nitrogen injection pressure needs to be less than or equal to the experimental pressure of the nitrogen, and the preset nitrogen injection pressure can be obtained through calculation.

Specifically, in one embodiment, the preset gas injection pressure is calculated by equation (1):

wherein P1 is the predetermined gas injection pressure, P is the predetermined experimental pressure, T1 is the indoor temperature of the apparatus, and T is the predetermined experimental temperature.

The preset experiment temperature can be achieved by controlling the electric heating sleeve to be heated through the temperature control instrument, and the preset experiment pressure can be finely adjusted through the hand-operated pump. The predetermined gas may be nitrogen, and the predetermined gas injection pressure is related to a predetermined experimental pressure, an indoor temperature of the apparatus, and a predetermined experimental temperature. The preset nitrogen injection pressure can be obtained by the formula (1).

Further, in one embodiment, as shown in fig. 1, the temperature and pressure coordinated control system further includes a second electric heating jacket (27) and a second temperature control instrument (26), the second electric heating jacket (27) is connected with the piston container (28) and the second temperature control instrument (26), respectively; the data acquisition and processing system also comprises a temperature sensor (33), and the temperature sensor (33) is arranged in the infiltration kettle through the test point; a second temperature control instrument (26) is used for controlling a second electric heating sleeve (27) to heat the pressurized gas in the piston container (28) to a preset experiment temperature; finely adjusting the pressure in the imbibition kettle by using a hand pump (29) to enable the pressure in the imbibition kettle to reach a preset experimental pressure, wherein the preset gas injection pressure is less than or equal to the preset experimental pressure; and under the condition that the pressure in the imbibition kettle is determined to reach the preset experimental pressure through the pressure sensor (9), and the temperature of the fluid is determined to reach the preset experimental temperature through the temperature sensor (33), the first two-way valve (7) is closed.

Specifically, in one embodiment, the temperature sensor (33) has a range of-20 ℃ to 150 ℃.

The gas of pressure boost in piston container (28) can be nitrogen gas, when heating nitrogen gas to predetermineeing the experiment temperature, utilizes hand pump (29) to finely tune the pressure in the imbibition cauldron, makes the pressure in the imbibition cauldron reach and predetermines the experiment pressure, wherein, predetermines nitrogen gas injection pressure and need be less than or equal to and predetermine the experiment pressure, predetermines nitrogen gas injection pressure and can obtain through calculating, specifically, can obtain through formula (1) calculation. When the pressure sensor (9) determines that the air pressure in the imbibition kettle reaches the preset experimental pressure, and the temperature sensor (33) determines that the temperature of the fluid reaches the preset experimental temperature, the first two-way valve (7) is closed. The measuring range of the temperature sensor (33) is-20 ℃ to 150 ℃, the lowest temperature of the indoor temperature and the experimental temperature can be-20 ℃, and the highest temperature can be 150 ℃.

Further, in one embodiment, as shown in fig. 1, the coordinated temperature and pressure control system further includes a pressure reducing valve (2), a third pressure gauge (3), a second two-way valve (4), a third two-way valve (5), a safety valve (30), and a gas vent valve (31); the first end of the pressure reducing valve (2) is connected with the gas bottle (1), the second end of the pressure reducing valve (2) is connected with the first end of a third pressure gauge (3), the second end of the third pressure gauge (3) is connected with the first end of a second two-way valve (4), the second end of the second two-way valve (4) is connected with the first end of a third two-way valve (5), the second end of the third two-way valve (5) is connected with a piston container (28), and a safety valve (30) is connected with a second pressure gauge (8).

The temperature and pressure coordinated control system can simulate the formation pressure and temperature conditions of a real shale reservoir, after normal-temperature pressurized gas is injected into the imbibition kettle, the pressure of the gas can be greatly increased along with the increase of the temperature when fluid in the imbibition kettle is heated, the pressure in the imbibition kettle can be changed, the high-temperature and high-pressure imbibition displacement environment is constructed in the imbibition kettle, the high-temperature and high-pressure environment is coordinately controlled, the influence of the temperature on the gas pressure is reduced by heating the fluid in the imbibition kettle and the pressurized gas in a piston container (28), the formation pressure and temperature conditions of the shale reservoir are truly simulated, the imbibition displacement environment of crude oil in the shale can be truly reduced, and a certain basis is provided for the subsequent research of deep shale oil resource development.

In one embodiment, as shown in fig. 1, the infiltration displacement system further comprises a titanium alloy infiltration absorption kettle cover (22) and a stainless steel infiltration absorption kettle body (35), wherein the titanium alloy infiltration absorption kettle cover (22) is located at the outer side of the sample suspension bracket (24), and the titanium alloy infiltration absorption kettle cover (22) and the stainless steel infiltration absorption kettle body (35) form an infiltration absorption kettle in combination; in the experimental preparation stage, a circuit is closed to electrify the electromagnet (14), the electromagnetic force of the electromagnet (14) is increased through the slide rheostat (15), so that the electromagnet (14) attracts the inner permanent magnet (17) to enable the inner permanent magnet (17) to be positioned at the top of the titanium alloy pipe column (19), and the sample (23) is positioned at the upper part of the infiltration absorption kettle; at the beginning stage of the experiment, the electromagnetic force of the electromagnet (14) is reduced through the sliding rheostat (15), the inner permanent magnet (17) and the sample (23) are made to descend under the action of gravity, when the inner permanent magnet (17) descends to be close to the bottom of the titanium alloy pipe column (19), the circuit of the electromagnet (14) is disconnected, so that the outer permanent magnet (21) and the inner permanent magnet (17) repel each other to generate corresponding magnetic field force, and the weight of the sample (23), the sample suspension bracket (24) and the inner permanent magnet (17) is transmitted to the electronic balance (11) through the first suspension line (12) through the coupling of the magnetic field force, so that the electronic balance (11) can weigh the sample (23).

Specifically, in one embodiment, the bottom of the imbibition reactor is designed for magnetic stirring, the top of the imbibition reactor is detachable, and the pressure resistance of the imbibition reactor is 50 MPa.

The electronic balance can be a high-precision electronic balance, the high-precision electronic balance can be an electronic balance with a measuring range of 220g and a precision of 0.001g, and the high-precision electronic balance can be an electronic balance with a data transmission function. The conventional experimental device is generally used for measuring the imbibition experiment under the condition of normal temperature and pressure. Because high accuracy electronic balance can not place in high temperature high pressure environment for the experimental apparatus is difficult to carry out the measurement of sample weight to the imbibition experiment in high temperature high pressure environment, carries out the measurement of weight to the sample in high temperature high pressure environment in order to realize, can separate sample environment and test environment. In particular, the sample weight can be weighed using magnetic levitation techniques. In the experimental preparation stage, as shown in fig. 2A, the electromagnet is powered on by closing the circuit, the electromagnetic force of the electromagnet is increased by the slide rheostat, so that magnetic attraction force is generated between the electromagnet and the inner permanent magnet, and the inner permanent magnet is positioned at the top of the titanium alloy pipe column, so that the sample is positioned at the upper part of the infiltration kettle; at the beginning of the experiment, as shown in fig. 2B, the electromagnetic force of the electromagnet is reduced by the sliding rheostat, so that the inner permanent magnet and the sample descend under the action of gravity, and when the inner permanent magnet descends to be close to the bottom of the titanium alloy pipe column, the circuit of the electromagnet is disconnected, so that magnetic repulsion is generated between the outer permanent magnet and the inner permanent magnet. The weight of the sample in the imbibition kettle is transferred to the high-precision electronic balance in a non-contact manner through the magnetic field force coupling effect formed by the inner permanent magnet and the outer permanent magnet, so that the sample environment can be separated from the test environment, the high-precision electronic balance can accurately measure the weight of the sample in the high-temperature and high-pressure environment, the metering precision is high, and real-time continuous monitoring can be realized. The infiltration absorption kettle can be composed of a titanium alloy infiltration absorption kettle cover and a stainless steel infiltration absorption kettle body, the bottom of the infiltration absorption kettle can be designed to be magnetically stirred, the top of the infiltration absorption kettle can be disassembled, and the compression strength of the infiltration absorption kettle can be 50 MPa.

Further, in one embodiment, as shown in fig. 1, the imbibition displacement system further comprises a glass window (25), a magnetic stirring motor (36), a horizontal bracket (37), a liquid emptying valve (38), a fourth two-way valve (39) and a liquid cup (40); the glass window (25) is located on the outer side of the sample suspension support (24) and located on the inner side of the stainless steel infiltration absorption kettle body (35), the magnetic stirring motor (36) is connected with the stainless steel infiltration absorption kettle body (35) and used for stirring working liquid, the horizontal support (37) is located below the stainless steel infiltration absorption kettle body (35) and used for horizontally adjusting the stainless steel infiltration absorption kettle body (35), the liquid emptying valve (38) is connected with the stainless steel infiltration absorption kettle body (35) and used for emptying liquid, the first end of the fourth two-way valve (39) is connected with the stainless steel infiltration absorption kettle body (35), and the second end of the fourth two-way valve (39) is connected with the liquid cup (40) and used for guiding the working liquid in the liquid cup (40) into the infiltration absorption kettle.

Specifically, in one embodiment, the glass window (25) is sapphire glass with a compressive strength of 50 MPa.

When crude oil displaced by imbibition is adhered to the surface of the rock core and is difficult to remove, the magnetic stirring machine can be started to stir the working fluid for a certain time, so that the crude oil can be better imbibed. When the working solution is led into the imbibition cauldron, conventional experimental apparatus can sink the sample into the working solution earlier and construct high temperature high pressure environment again, but can cause great error to the imbibition experiment like this, is difficult to imitate real fracturing fluid imbibition replacement effect under the stratum condition, consequently, can through making high temperature high pressure environment earlier, sink the sample into the working solution again, avoids causing the error to the imbibition experiment. Specifically, the electromagnetic force can be changed to realize the lifting control of the sample, the magnetic force of the electromagnet above the titanium alloy pipe column can be changed through the sliding rheostat, so that the attraction force between the electromagnet and the permanent magnet inside the titanium alloy pipe column is changed, the lifting or descending of the sample is controlled, the electromagnet can be made to lose magnetism through the circuit switch, and the permanent magnet inside the titanium alloy pipe column only forms the magnetic field force coupling effect with the permanent magnet outside the titanium alloy pipe column. For example, in the experimental preparation stage, as shown in fig. 2A, the electromagnet is energized by closing the circuit, the electromagnetic force of the electromagnet is increased by sliding the rheostat, so that magnetic attraction force is generated between the electromagnet and the inner permanent magnet, the inner permanent magnet is positioned at the top of the titanium alloy pipe column, and the sample can be lifted to the upper part of the infiltration kettle; at the beginning of the experiment, as shown in fig. 2B, the electromagnetic force of the electromagnet is reduced by the slide rheostat, so that the inner permanent magnet and the sample can descend under the action of gravity, when the inner permanent magnet descends to a position close to the bottom of the titanium alloy pipe column, the circuit of the electromagnet can be disconnected, magnetic repulsion is generated between the outer permanent magnet and the inner permanent magnet, and the sample can descend to the bottom.

The imbibition replacement system is used as the core of the whole device and as a place for carrying out imbibition replacement on fluid in the rock core by using working fluid, and can better simulate the imbibition replacement process of crude oil in the shale by using fracturing fluid.

The shale imbibition experimental device for magnetic suspension measurement comprises a processor and a memory, wherein the imbibition displacement system module 100, the magnetic suspension lifting measurement system module 200, the data acquisition and processing system module 300, the temperature and pressure coordination control system module 400 and the like are stored in the memory as program units, and the processor executes the program modules stored in the memory to realize corresponding functions.

Fig. 3 schematically shows a flow diagram of an imbibition experimental method according to an embodiment of the application. As shown in fig. 3, in an embodiment of the present application, there is provided a imbibition experimental method, which is applied to a magnetic suspension metered shale imbibition experimental apparatus, where the magnetic suspension metered shale imbibition experimental apparatus includes a sample suspension bracket, a magnetic suspension lifting device, an imbibition kettle, a piston container, an electronic balance, a liquid cup, and a two-way valve connected to the liquid cup, where the imbibition kettle is formed by combining a titanium alloy imbibition kettle cover and a stainless steel imbibition kettle body, and the method includes the following steps:

step 301, obtaining a sample to be tested.

Step 302, pretreating a sample, and placing the pretreated sample into a sample hanging bracket.

And 303, controlling the sample to be kept at the upper part of the imbibition kettle by a magnetic suspension lifting device.

And 304, injecting the prepared working solution into a liquid cup, and injecting the working solution in the liquid cup into the imbibition kettle.

And 305, adjusting the temperature and the pressure in the imbibition kettle to a preset experiment temperature and a preset experiment pressure.

And step 306, controlling the sample to be immersed in the working solution of the infiltration kettle through the magnetic suspension lifting device.

And 307, cutting off a power supply of the magnetic suspension lifting device, and determining the weight of the sample through the electronic balance.

And 308, determining that the sample completes the imbibition experiment under the condition that the duration time of the unchanged weight of the sample reaches the preset time length.

The two-way valve connected with the liquid cup is a fourth two-way valve (39) in the shale imbibition experimental device with magnetic suspension metering.

For step 301, before performing the imbibition experiment, the processor needs to obtain a sample to be measured, where the sample to be measured may be a core sample, a working fluid, a pressurized gas, or the like. Specifically, the core sample can be a cylindrical regular core sample or an irregular core sample, the working fluid can be fracturing fluid in the shale oil tight well drainage and production process, and the pressurized gas can be nitrogen.

For step 302, after obtaining the sample to be tested, the processor may perform pretreatment on the sample, specifically, the pretreatment may be oil washing, drying, saturated crude oil treatment, surface treatment, or the like, and the pretreated sample may be placed in a suspension bracket of the sample.

Further, in one embodiment, the sample is pre-treated, and placing the pre-treated sample in the sample hanging rack comprises: carrying out oil washing and drying operation on the sample, and determining a first weight of the sample; carrying out saturated crude oil treatment on the sample subjected to oil washing and drying, and determining a second weight of the sample subjected to saturated crude oil treatment; and carrying out surface treatment on the sample treated by the saturated crude oil to obtain a surface-treated sample, and putting the surface-treated sample into a sample hanging bracket.

The weight of the core sample is measured after the sample is pretreated by washing oil and drying, can be determined as the first weight of the sample, and can be M₁Similarly, the sample after the oil-washing and drying is subjected to the saturated crude oil treatment, the weight of the recorded rock sample needs to be measured again, the second weight of the sample can be determined, and M can be used₂And (4) showing. And carrying out surface treatment on the sample after saturated crude oil treatment, wherein the surface treatment can be any one of the modes of surface unsealing, annular sealing and top surface sealing, and the corresponding imbibition mode can be any one of reverse spontaneous imbibition, forward spontaneous imbibition and single-surface contact spontaneous imbibition. The resulting surface treated sample may be placed in a hanging rack of samples.

In step 303, after the processor pre-processes the sample, the processor may control the sample to be maintained at the upper portion of the imbibition reactor through the magnetic suspension lifting device, where the upper portion of the imbibition reactor is maintained at or above the position 1/2 of the imbibition reactor.

Further, in one embodiment, the magnetic suspension lifting device comprises an electromagnet, a slide rheostat, an inner permanent magnet, an outer permanent magnet and a circuit switch; controlling the sample to be kept on the upper part of the imbibition kettle through a magnetic suspension lifting device comprises: the control circuit switch is communicated, the circuit switch is closed to electrify the electromagnet, the electromagnetic force of the electromagnet is increased through the sliding rheostat, so that the inner permanent magnet is attracted by the electromagnet and positioned at the top of the titanium alloy pipe column, and the sample is kept at the upper part of the infiltration kettle.

For example, as shown in fig. 2A, the processor may control the circuit switch to be connected, close the circuit switch to energize the electromagnet, increase the electromagnetic force of the electromagnet by sliding the rheostat, increase the magnetic attraction force between the electromagnet and the inner permanent magnet, position the inner permanent magnet on the top of the titanium alloy column, and maintain the sample at the upper part of the infiltration kettle, i.e., the position of the infiltration kettle 1/2 and above. For step 304, the processor injects the prepared working fluid into the fluid cup, and the working fluid in the fluid cup can be injected into the imbibition kettle by opening the fourth two-way valve (39), wherein the working fluid is located at the position of the imbibition kettle 1/2 and in the area below the position.

Further, the upper part of the imbibition kettle comprises the 1/2 position of the imbibition kettle and the area above, the prepared working solution is injected into the liquid cup, and the working solution in the liquid cup is injected into the imbibition kettle, comprising: and when the liquid level position of the imbibition kettle is located at the position 1/2 of the imbibition kettle, closing the two-way valve to stop injecting the working solution into the imbibition kettle. The working liquid in the liquid cup can be injected into the imbibition kettle by opening the fourth two-way valve (39), the liquid level position of the imbibition kettle refers to the liquid level position of the working liquid injected into the imbibition kettle, and when the liquid level position of the working liquid injected into the imbibition kettle reaches the 1/2 position of the imbibition kettle, the processor can stop injecting the working liquid into the imbibition kettle, and specifically, the working liquid can be stopped from being injected by closing the fourth two-way valve (39). For step 305, after the processor injects the working fluid into the imbibition reactor, the processor may inject the pressurized gas in the piston container into the upper portion of the imbibition reactor, and the pressure of the injected gas needs to be adjusted to the preset experimental pressure.

Further, in one embodiment, adjusting the temperature and pressure within the imbibition reactor to the predetermined experimental temperature and predetermined experimental pressure comprises: injecting pressurized gas into the piston container, and injecting the pressurized gas into the infiltration kettle so as to enable the pressure in the infiltration kettle to reach the preset gas injection pressure; finely adjusting the pressure in the imbibition kettle under the conditions that the fluid in the imbibition kettle is heated to a preset experimental temperature and the pressurized gas in the piston container is heated to the preset experimental temperature; and stopping injecting the pressurized gas under the condition that the pressure in the imbibition kettle reaches a preset experimental pressure, wherein the preset gas injection pressure is less than or equal to the preset experimental pressure.

Further, in one embodiment, the shale imbibition experimental device with magnetic suspension metering further comprises a gas cylinder and a first electric heating jacket, wherein the gas cylinder is used for providing a high-pressure environment of 50MPa for the imbibition kettle through the piston container, and the first electric heating jacket is used for providing a high-temperature environment of 150 ℃ for the imbibition kettle and the piston container.

Further, in one embodiment, the preset gas injection pressure is calculated by equation (1):

After the pressurized gas at normal temperature is injected into the infiltration absorption kettle, the gas pressure is greatly increased when the fluid in the infiltration absorption kettle is heated subsequently, so that the pressure in the infiltration absorption kettle is changed, and therefore, an infiltration absorption replacement environment with high temperature and high pressure needs to be constructed in the infiltration absorption kettle, and the high-temperature and high-pressure environment can be coordinately controlled. The pressure value of the high-pressure environment can be 50MPa and can be provided by a gas cylinder, the temperature value of the high-temperature environment can be 150 ℃, and the temperature value can be provided by the first electric heating sleeve. Specifically, the processor can be used for constructing a high-temperature and high-pressure environment in the infiltration kettleThe pressure of (c) needs to be adjusted to a preset experimental pressure. The pressurized gas is injected into the piston container, the pressurized gas can be nitrogen, the pressurized gas can be injected into the infiltration kettle by using a hand pump, the injected pressurized gas is positioned at the upper part of the infiltration kettle, so that the pressure in the infiltration kettle reaches the preset gas injection pressure, and the preset gas injection pressure can be expressed as P₁. The treater can adopt the temperature-controlled instrument of imbibition cauldron department to heat the fluid in the imbibition cauldron to predetermined experimental temperature, can adopt the temperature-controlled instrument of piston container department to heat the pressurized gas in the piston container to predetermined experimental temperature. Piston container and imbibition cauldron can adopt first electric heating jacket to heat, and the pressure in the imbibition cauldron can be finely tuned through hand pump, makes the pressure in the imbibition cauldron reach and predetermines experimental pressure, and when the pressure in the imbibition cauldron reached and predetermines experimental pressure, can stop to inject pressurized gas in the imbibition cauldron through closing two-way valve (7). As the temperature of the imbibition reactor rises, the pressure of the pressurized gas can increase, so that the preset gas injection pressure needs to be less than the experimental pressure,

for step 306, the processor may control the sample to sink into the working solution of the infiltration kettle through the magnetic suspension lifting device, for example, as shown in fig. 2B, the electromagnetic force of the electromagnet may be reduced through the sliding rheostat, so that the inner permanent magnet and the sample may descend under the gravity, and when the inner permanent magnet descends to be close to the bottom of the titanium alloy pipe column, the sample may be considered to sink into the working solution of the infiltration kettle.

For step 307, the processor may determine the weight of the sample via the electronic balance by turning off the power to the magnetic levitation elevator as the inner permanent magnet descends to near the bottom of the titanium alloy string.

Further, in an embodiment, the shale imbibition experimental device for magnetic suspension measurement further includes a first suspension line and a suspension bracket, the electronic balance is connected with the suspension bracket through the first suspension line, the power supply of the magnetic suspension lifting device is cut off, and determining the weight of the sample through the electronic balance includes: and disconnecting the power supply of the electromagnet to enable the outer permanent magnet and the inner permanent magnet to repel each other to generate corresponding magnetic field force, and transmitting the weight of the sample, the sample suspension bracket and the inner permanent magnet to the electronic balance through the coupling of the magnetic field force so that the electronic balance weighs the sample to determine the weight of the sample.

Specifically, as shown in fig. 2B, the electromagnetic force of the electromagnet can be reduced by sliding the rheostat, so that the inner permanent magnet and the sample can descend under the action of gravity, and when the inner permanent magnet descends to a position close to the bottom of the titanium alloy pipe column, i.e., when the sample is immersed in the working solution, the power supply of the electromagnet can be disconnected, so that the outer permanent magnet and the inner permanent magnet repel each other to generate a corresponding magnetic field force. The weight of the sample, the sample suspension bracket and the inner permanent magnet can be transmitted to the electronic balance through the first suspension line by the coupling of the magnetic field force, and the electronic balance can weigh the sample and determine the weight of the sample. The electronic balance can be a high-precision electronic balance and can have a data transmission function, and the measuring range of the electronic balance can be 220g, and the precision is 0.001 g.

For step 308, the processor may determine that the sample has completed the imbibition experiment if the duration of time during which the weight of the sample has not changed reaches a predetermined length of time. For example, after the weight data of the sample measured by the balance is kept stable for 10 hours, the experiment can be ended, the experimental equipment is closed, the core sample is taken out, and finally the experimental equipment is cleaned for the next experiment,

in one embodiment, the imbibition assay method further comprises: determining the weight of the sample subjected to surface treatment when the sample is immersed in the working solution of the infiltration kettle to be a third weight; acquiring the weight of a sample collected by the electronic balance in the experimental process as a fourth weight; acquiring the experimental time consumed by the sample to complete the imbibition experiment; and determining the imbibition displacement efficiency of the sample according to the first weight, the second weight, the third weight and the fourth weight.

In one embodiment, determining the imbibition displacement efficiency of the sample based on the first weight, the second weight, the third weight, and the fourth weight comprises determining the imbibition displacement efficiency of the sample by equation (2):

wherein eta is imbibition displacement efficiency, unit is%, rho_oIs the crude oil density in g/cm³，ρ_wIs the density of the working fluid and has a unit of g/cm³，M₁Is a first weight, M₂Is a second weight, M₃Is a third weight, and M is a fourth weight, wherein the units of weight are g.

The weight of the sample after surface treatment is changed when the sample is immersed in the working solution of the infiltration kettle, the weight of the sample after surface treatment when the sample is immersed in the working solution of the infiltration kettle can be determined to be a third weight by the processor, and M can be used₃And the processor can acquire the weight of the sample collected by the electronic balance in the experimental process as a fourth weight, and can be expressed by M. The processor can obtain the experimental duration consumed by the sample to complete the imbibition experiment, for example, after the weight data of the sample measured by the balance is kept stable for 10 hours, the experiment can be ended, the experimental equipment is closed, the core sample is taken out, the experimental equipment is finally cleaned for the next experiment, and the 10 hours can represent the experimental duration consumed by the sample to complete the imbibition experiment. The processor may be based on a first weight M₁Second weight M₂And determining the imbibition and displacement efficiency of the sample according to the third weight and the fourth weight, wherein the imbibition and displacement efficiency can be obtained by calculation according to a formula (2). As shown in fig. 4, a chart of the imbibition efficiency of the shale imbibition experimental method of magnetic suspension measurement is provided. It can be seen that after calculating the imbibition displacement efficiency, an image of the imbibition displacement efficiency changing with time can be drawn by combining the experimental time t, and the imbibition experimental result can be analyzed according to the image, so that the imbibition experiment can be better improved, and the imbibition displacement efficiency can be improved.

Through the seepage experiment method, on one hand, the lifting of the position of the sample can be controlled through the magnetic suspension lifting device, the high-temperature and high-pressure environment is firstly constructed, then the sample is immersed in the working solution, the contact between the sample and the working solution is avoided, the experiment precision of the seepage experiment is rarely influenced when the working solution is added or the temperature and the pressure are adjusted subsequently, and meanwhile, the real fracturing fluid displacement effect under the stratum condition can be better simulated. On the other hand, the weight of the sample can be transmitted to the electronic balance in a non-contact manner through the magnetic field force coupling effect, the sample environment is separated from the measurement environment, the measurement of the weight of the sample in a high-temperature and high-pressure environment is realized, the measurement precision is high, meanwhile, the weight of the sample can be continuously monitored in real time, and the subsequent calculation of the sample imbibition experimental efficiency is facilitated.

FIG. 3 is a schematic flow chart of the imbibition test method in one embodiment. It should be understood that, although the steps in the flowchart of fig. 3 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 3 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

The processor comprises a kernel, and the kernel calls the corresponding program unit from the memory. One or more than one kernel can be set, and the imbibition experimental method is realized by adjusting kernel parameters.

The memory may include volatile memory in a computer readable medium, Random Access Memory (RAM) and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip.

An embodiment of the present application provides a storage medium, on which a program is stored, which when executed by a processor implements the imbibition experimental method described above.

The embodiment of the application provides a processor, wherein the processor is used for running a program, and the program is used for executing the imbibition experimental method during running.

In one embodiment, a computer device is provided, which may be a server, the internal structure of which may be as shown in fig. 5. The computer device includes a processor a01, a network interface a02, a memory (not shown), and a database (not shown) connected by a system bus. Wherein processor a01 of the computer device is used to provide computing and control capabilities. The memory of the computer device comprises an internal memory a03 and a non-volatile storage medium a 04. The non-volatile storage medium a04 stores an operating system B01, a computer program B02, and a database (not shown in the figure). The internal memory a03 provides an environment for the operation of the operating system B01 and the computer program B02 in the nonvolatile storage medium a 04. The database of the computer device is used to store balance data, pressure sensor data and temperature sensor data. The network interface a02 of the computer device is used for communication with an external terminal through a network connection. The computer program B02 is executed by the processor a01 to implement an imbibition experimental method.

The embodiment of the application provides equipment, the equipment comprises a processor, a memory and a program which is stored on the memory and can run on the processor, and the following steps are realized when the processor executes the program: obtaining a sample to be detected; pretreating a sample, and putting the pretreated sample into a sample hanging bracket; controlling the sample to be kept at the upper part of the imbibition kettle by a magnetic suspension lifting device; injecting the prepared working solution into a liquid cup, and injecting the working solution in the liquid cup into the imbibition kettle; adjusting the temperature and the pressure in the imbibition kettle to a preset experiment temperature and a preset experiment pressure; controlling the sample to immerse in the working solution of the infiltration kettle by a magnetic suspension lifting device; cutting off a power supply of the magnetic suspension lifting device, and determining the weight of the sample through an electronic balance; and determining that the sample completes the imbibition experiment under the condition that the duration time of the unchanged weight of the sample reaches the preset duration.

In one embodiment, the magnetic suspension lifting device for controlling the sample to be kept on the upper part of the infiltration absorption kettle comprises: the control circuit switch is communicated, the circuit switch is closed to electrify the electromagnet, the electromagnetic force of the electromagnet is increased through the sliding rheostat, so that the inner permanent magnet is attracted by the electromagnet and positioned at the top of the titanium alloy pipe column, and the sample is kept at the upper part of the infiltration kettle.

In one embodiment, the step of switching off the power supply of the magnetic suspension lifting device and the step of determining the weight of the sample through the electronic balance comprises the following steps: and disconnecting the power supply of the electromagnet to enable the outer permanent magnet and the inner permanent magnet to repel each other to generate corresponding magnetic field force, and transmitting the weight of the sample, the sample suspension bracket and the inner permanent magnet to the electronic balance through the coupling of the magnetic field force so that the electronic balance weighs the sample to determine the weight of the sample.

In one embodiment, the upper part of the imbibition reactor comprises the 1/2 position of the imbibition reactor and the area above, the injecting the prepared working solution into the liquid cup, and the injecting the working solution in the liquid cup into the imbibition reactor comprises: and when the liquid level position of the imbibition kettle is located at the position 1/2 of the imbibition kettle, closing the two-way valve to stop injecting the working solution into the imbibition kettle.

In one embodiment, adjusting the temperature and pressure within the imbibition reactor to the predetermined experimental temperature and predetermined experimental pressure comprises: injecting pressurized gas into the piston container, and injecting the pressurized gas into the infiltration kettle so as to enable the pressure in the infiltration kettle to reach the preset gas injection pressure; finely adjusting the pressure in the imbibition kettle under the conditions that the fluid in the imbibition kettle is heated to a preset experimental temperature and the pressurized gas in the piston container is heated to the preset experimental temperature; and stopping injecting the pressurized gas under the condition that the pressure in the imbibition kettle reaches a preset experimental pressure, wherein the preset gas injection pressure is less than or equal to the preset experimental pressure.

In one embodiment, the preset gas injection pressure is calculated by equation (1):

In one embodiment, the sample is pre-treated, and placing the pre-treated sample in a sample hanging rack comprises: carrying out oil washing and drying operation on the sample, and determining a first weight of the sample; carrying out saturated crude oil treatment on the sample subjected to oil washing and drying, and determining a second weight of the sample subjected to saturated crude oil treatment; and carrying out surface treatment on the sample treated by the saturated crude oil to obtain a surface-treated sample, and putting the surface-treated sample into a sample hanging bracket.

In one embodiment, the shale imbibition experimental device with magnetic suspension metering further comprises a gas cylinder and a first electric heating jacket, wherein the gas cylinder is used for providing a high-pressure environment of 50MPa for the imbibition reactor through the piston container, and the first electric heating jacket is used for providing a high-temperature environment of 150 ℃ for the imbibition reactor and the piston container.

The present application further provides a computer program product adapted to perform a program for initializing the following method steps when executed on a data processing device: obtaining a sample to be detected; pretreating a sample, and putting the pretreated sample into a sample hanging bracket; controlling the sample to be kept at the upper part of the imbibition kettle by a magnetic suspension lifting device; injecting the prepared working solution into a liquid cup, and injecting the working solution in the liquid cup into the imbibition kettle; adjusting the temperature and the pressure in the imbibition kettle to a preset experiment temperature and a preset experiment pressure; controlling the sample to immerse in the working solution of the infiltration kettle by a magnetic suspension lifting device; cutting off a power supply of the magnetic suspension lifting device, and determining the weight of the sample through an electronic balance; and determining that the sample completes the imbibition experiment under the condition that the duration time of the unchanged weight of the sample reaches the preset duration.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.

Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.

The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. The utility model provides a shale imbibition experimental apparatus of magnetic suspension measurement which characterized in that, the device includes:

wherein the outer permanent magnet (21) is located outside the titanium alloy pipe column (19) and connected with the suspension bracket (13) through the third suspension line (20), the inner permanent magnet (17) is located inside the titanium alloy pipe column (19), the second suspension line (18) is connected with the sample suspension bracket (24), the sample (23) is suspended below the inner permanent magnet (17) through the sample suspension bracket (24), the outer permanent magnet (21) and the inner permanent magnet (17) repel each other, and the magnetic field force between the inner permanent magnet (17) and the outer permanent magnet (21) varies according to the weight of the sample (23);

the data acquisition and processing system is used for recording the weight of the sample (23) after imbibition and displacement in real time and comprises an electronic balance (11), the electronic balance (11) is connected with the suspension bracket (13) through the first suspension line (12), and the weight of the sample (23), the sample suspension bracket (24) and the inner permanent magnet (17) is transmitted to the electronic balance (11) through the suspension line (12) under the coupling action of the magnetic field force so as to monitor the change condition of the weight of the sample (23) through the electronic balance (11).

2. The device according to claim 1, characterized in that the magnetic levitation lift metering system further comprises an electromagnet (14), a sliding rheostat (15) and a circuit switch (16), wherein the electromagnet (14) is fixed above the outside of the titanium alloy pipe column (19), a first end of the sliding rheostat (15) is connected in series with the circuit switch (16), and a second end of the sliding rheostat (15) is connected with the electromagnet (14).

3. The device according to claim 2, wherein the infiltration suction replacement system further comprises a titanium alloy infiltration suction kettle cover (22) and a stainless steel infiltration suction kettle body (35), wherein the titanium alloy infiltration suction kettle cover (22) is positioned at the outer side of the sample suspension bracket (24), and the titanium alloy infiltration suction kettle cover (22) and the stainless steel infiltration suction kettle body (35) form an infiltration suction kettle in combination;

in the experimental preparation stage, a circuit is closed to electrify the electromagnet (14), the electromagnetic force of the electromagnet (14) is increased through the slide rheostat (15), so that the inner permanent magnet (17) is attracted by the electromagnet (14) to be positioned at the top of the titanium alloy pipe column (19), and the sample (23) is positioned at the upper part of the infiltration kettle;

in the beginning stage of the experiment, the electromagnetic force of the electromagnet (14) is reduced through the sliding rheostat (15), the inner permanent magnet (17) and the sample (23) are descended under the action of gravity, when the inner permanent magnet (17) descends to be close to the bottom of the titanium alloy pipe column (19), the circuit of the electromagnet (14) is disconnected, so that the outer permanent magnet (21) and the inner permanent magnet (17) repel each other to generate corresponding magnetic field force, and the weight of the sample (23), the sample suspension bracket (24) and the inner permanent magnet (17) is transmitted to the electronic balance (11) through the first suspension wire (12) through the coupling of the magnetic field force, so that the electronic balance (11) weighs the sample (23).

4. The device according to claim 3, characterized in that the device further comprises a temperature and pressure coordinated control system, wherein the temperature and pressure coordinated control system comprises a gas cylinder (1), a piston container (28) and a first electric heating jacket (34), the gas cylinder (1) is used for providing a high-pressure environment of 50MPa for the imbibition reactor through the piston container (28), and the first electric heating jacket (34) is used for providing a high-temperature environment of 150 ℃ for the imbibition reactor and the piston container (28).

5. The device according to claim 4, wherein the temperature and pressure coordinated control system further comprises a first pressure gauge (6), a first two-way valve (7), a second pressure gauge (8), a hand pump (29) and a first temperature control instrument (32); the data acquisition and processing system is also used for acquiring pressure data of the imbibition displacement system and further comprises a pressure sensor (9);

the first end of the first pressure gauge (6) is connected with the first end of the first two-way valve (7), the second end of the first pressure gauge (6) is connected with the piston container (28), the second end of the first two-way valve (7) is connected with the first end of the second pressure gauge (8), the second end of the second pressure gauge (8) is connected with the first end of the pressure sensor (9), the second end of the pressure sensor (9) is connected with the stainless steel imbibition kettle body (35), and the first temperature control instrument (32) is connected with the first electric heating sleeve (34);

pressurizing gas in the piston container (28), injecting the gas into the upper part of the infiltration kettle by using the hand pump (29), and controlling the air pressure in the infiltration kettle to reach a preset gas injection pressure by using the pressure sensor (9); and controlling the temperature of the first electric heating sleeve (34) by utilizing the first temperature control instrument (32) so as to control the first electric heating sleeve (34) to heat the fluid in the imbibition kettle to a preset experimental temperature.

6. The device according to claim 5, wherein the temperature and pressure coordinated control system further comprises a second electric heating jacket (27) and a second temperature control instrument (26), the second electric heating jacket (27) is respectively connected with the piston container (28) and the second temperature control instrument (26);

the data acquisition and processing system also comprises a temperature sensor (33), wherein the temperature sensor (33) is arranged inside the imbibition kettle through a test point;

the second temperature control instrument (26) controls the second electric heating jacket (27) to heat the pressurized gas in the piston container (28) to the preset experiment temperature; finely adjusting the pressure in the imbibition kettle by using the hand pump (29) to enable the pressure in the imbibition kettle to reach a preset experimental pressure, wherein the preset gas injection pressure is less than or equal to the preset experimental pressure;

and under the condition that the pressure sensor (9) determines that the air pressure in the imbibition kettle reaches the preset experimental pressure and the temperature sensor (33) determines that the temperature of the fluid reaches the preset experimental temperature, closing the first two-way valve (7).

7. The device according to claim 6, characterized in that the temperature sensor (33) has a span of-20 ℃ to 150 ℃.

8. The apparatus of claim 5, wherein the preset gas injection pressure is calculated by equation (1):

wherein P1 is a preset gas injection pressure, P is a preset experimental pressure, T1 is the indoor temperature of the apparatus, and T is the preset experimental temperature.

9. The device according to claim 5, wherein the temperature and pressure coordinated control system further comprises a pressure reducing valve (2), a third pressure gauge (3), a second two-way valve (4), a third two-way valve (5), a safety valve (30) and a gas blow-down valve (31);

the first end of the pressure reducing valve (2) is connected with the gas cylinder (1), the second end of the pressure reducing valve (2) is connected with the first end of a third pressure gauge (3), the second end of the third pressure gauge (3) is connected with the first end of a second two-way valve (4), the second end of the second two-way valve (4) is connected with the first end of a third two-way valve (5), the second end of the third two-way valve (5) is connected with the piston container (28), and the safety valve (30) is connected with the second pressure gauge (8).

10. The apparatus of claim 9, wherein the imbibition displacement system further comprises a glass window (25), a magnetic stirring motor (36), a horizontal bracket (37), a liquid vent valve (38), a fourth two-way valve (39), and a liquid cup (40);

wherein, glass window (25) are located the outside of sample hanging holder (24) is located the inboard of stainless steel infiltration absorption cauldron body (35), magnetic stirring motor (36) with stainless steel infiltration absorption cauldron body (35) are connected for stir the working solution, horizontal bracket (37) are located the below of stainless steel infiltration absorption cauldron body (35), it is right to be used for stainless steel infiltration absorption cauldron body (35) carry out the level control, liquid atmospheric valve (38) with stainless steel infiltration absorption cauldron body (35) are connected for the drain liquid, the first end of fourth two-way valve (39) with stainless steel infiltration absorption cauldron body (35) are connected, the second end of fourth two-way valve (39) with liquid cup (40) are connected, be used for with working solution in liquid cup (40) is leading-in to in the infiltration absorption cauldron.

11. Device according to claim 10, characterized in that the glass window (25) is sapphire glass with a compressive strength of 50 MPa.

12. The device according to claim 10, wherein the data acquisition and processing system further comprises a computer (10), and the magnetic levitation metered shale imbibition experimental device further comprises a digital display meter for transmitting the temperature value detected by the temperature sensor (33) and the pressure value detected by the pressure sensor (9) to the computer (10).

13. The device as claimed in claim 3, wherein the bottom of the infiltration kettle is designed for magnetic stirring, the top of the infiltration kettle is detachable, and the pressure resistance of the infiltration kettle is 50 MPa.

14. The device according to claim 1, characterized in that the electronic balance (11) is provided with a data transmission function, and the measuring range of the electronic balance (11) is 220g, and the precision is 0.001 g.

15. The device according to claim 1, characterized in that the titanium alloy pipe column (19) is connected with the titanium alloy infiltration kettle cover (22) in a sealing way through threads, and the compressive strength of the titanium alloy pipe column (19) is 50 MPa.