CN113670778B - Shale imbibition experimental device based on magnetic levitation metering - Google Patents

Shale imbibition experimental device based on magnetic levitation metering Download PDF

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Publication number
CN113670778B
CN113670778B CN202110989756.3A CN202110989756A CN113670778B CN 113670778 B CN113670778 B CN 113670778B CN 202110989756 A CN202110989756 A CN 202110989756A CN 113670778 B CN113670778 B CN 113670778B
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sample
pressure
imbibition
kettle
temperature
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CN113670778A (en
Inventor
苏玉亮
孙庆豪
王文东
郝永卯
李蕾
赵坤
郭新成
桑茜
董明哲
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China University of Petroleum East China
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China University of Petroleum East China
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
    • G01N13/04—Investigating osmotic effects

Abstract

The embodiment of the application provides a shale infiltration experimental device based on magnetic levitation metering. The device comprises: the imbibition displacement system is used for providing a place where the working fluid imbibition displacement is carried out on the fluid in the rock core so as to simulate the imbibition displacement process of fracturing fluid in the drainage and production process of the land shale oil stuffy well; the magnetic suspension lifting metering system is used for lifting the rock core by utilizing magnetic attraction force and metering the weight of the rock core by utilizing magnetic repulsive force; and the data acquisition and processing system is used for recording the weight of the sample after imbibition replacement in real time. The shale permeation experiment device based on magnetic suspension measurement can continuously monitor and measure the weight of a sample in real time, greatly improve the test precision, reduce the labor cost and simplify the device. Meanwhile, in shale imbibition experiments under high-temperature and high-pressure conditions, imbibition replacement process of fracturing fluid on crude oil in shale under stratum conditions can be better simulated, and a certain reference effect is provided for further research on deep shale oil resource development.

Description

Shale imbibition experimental device based on magnetic levitation metering
Technical Field
The application relates to the technical field of unconventional shale oil resource development, in particular to a shale imbibition experimental device based on magnetic levitation metering.
Background
In the technical field of unconventional shale oil resource development, a core imbibition device such as a 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 extract crude oil, but the existing core imbibition device has the defects that real-time metering cannot be realized, prediction precision is low, imbibition mode is single and the like under high temperature and high pressure conditions, and is difficult to be suitable for shale imbibition experiments under high temperature and high pressure conditions.
Disclosure of Invention
The embodiment of the application aims to provide a shale infiltration experimental device based on magnetic levitation metering.
To achieve the above object, a first aspect of the present application provides a shale infiltration experimental apparatus based on magnetic levitation metering, including:
the seepage displacement system is used for providing a place for carrying out seepage displacement on fluid in the rock core by working fluid so as to simulate a fracturing fluid seepage displacement process in a land shale oil stuffy well drainage process, and comprises a sample (23) and a sample suspension bracket (24), wherein the sample (23) is positioned on the sample suspension bracket (24);
the magnetic levitation lifting metering system is used for lifting the rock core by utilizing magnetic attraction force and metering the weight of the rock core by utilizing magnetic repulsion force, and comprises: the device comprises a first suspension wire (12), a suspension bracket (13), an inner permanent magnet (17), a second suspension wire (18), a titanium alloy pipe column (19), a third suspension wire (20) and an outer permanent magnet (21);
The outer permanent magnet (21) is positioned outside the titanium alloy pipe column (19), the inner permanent magnet (17) is connected with the suspension bracket (13) through a third suspension wire (20), the inner permanent magnet (17) is positioned inside the titanium alloy pipe column (19), the second suspension wire (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 processing system is used for recording the weight of the sample (23) after imbibition replacement in real time, the data acquisition processing system comprises an electronic balance (11), the electronic balance (11) is connected with a suspension bracket (13) through a first suspension wire (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 coupling effect of magnetic field force by the suspension wire (12) so as to monitor the change condition of the weight of the sample (23) through the electronic balance (11).
According to the technical scheme, the magnetic suspension lifting metering system can be used for continuously monitoring and metering the weight of a sample in real time, so that the testing precision of a imbibition experiment is greatly improved, the labor cost is reduced, the adopted device is simple and convenient, meanwhile, the device can be used for shale imbibition experiments under the conditions of normal temperature, normal pressure, high temperature and high pressure, is suitable for shale imbibition experiments with single-side contact and full contact, and can better simulate real oil reservoir conditions. Particularly, in shale imbibition experiments under high-temperature and high-pressure conditions, imbibition displacement process of fracturing fluid on crude oil in shale under stratum conditions can be better simulated, and a certain reference effect is provided for further research on deep shale oil resource development.
Additional features and advantages of embodiments of the present application will be set forth in the detailed description that follows.
Drawings
The accompanying drawings are included to provide a further understanding of embodiments of the present application and are incorporated in and constitute a part of this specification, illustrate embodiments of the present application and together with the description serve to explain, without limitation, the embodiments of the present application. In the drawings:
FIG. 1 schematically illustrates a block diagram of a shale infiltration experiment device based on magnetic levitation metering according to an embodiment of the present application;
FIG. 2A schematically illustrates an experimental process variation diagram of a shale infiltration experiment device based on magnetic levitation metering according to an embodiment of the present application;
FIG. 2B schematically illustrates an experimental process variation diagram of a shale infiltration experiment device based on magnetic levitation metering according to an embodiment of the present application;
FIG. 3 schematically shows a flow chart of a imbibition assay method according to an embodiment of the application;
FIG. 4 schematically illustrates a imbibition efficiency plot of a shale imbibition experimental method of magnetically levitated metering according to an embodiment of the application;
fig. 5 schematically shows an internal structural diagram of a computer device according to an embodiment of the present application.
Reference numerals
Third pressure gauge of 1 gas cylinder 2 pressure reducing valve 3
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 wire
13 hanging bracket 14 electromagnet 15 slide rheostat
16 circuit switch 17 inner permanent magnet 18 suspension wire
19 titanium alloy tubular column 20 suspension wire 21 outer permanent magnet
Sample suspension bracket for sample 24 of 22 titanium alloy infiltration kettle cover 23
25 glass window 26 temperature control instrument 27 second electric heating sleeve
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 sleeve 35 stainless steel imbibition kettle body 36 magnetic stirring motor
37 horizontal support 38 liquid discharge valve 39 fourth two-way valve
40 liquid cup
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in 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 implementations described herein are only for illustrating and explaining the embodiments of the present application, and are not intended to limit the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
The structure of the shale infiltration experiment device based on magnetic levitation metering is shown in figure 1.
In one embodiment, as shown in fig. 1, a shale imbibition experimental device based on magnetic levitation metering is provided, which comprises an imbibition replacement system module, a magnetic levitation lifting metering system module and a data acquisition and processing system module, wherein:
the imbibition displacement system module 100 is used for providing a place for imbibition displacement of fluid in the core by working fluid so as to simulate a fracturing fluid imbibition displacement process in a drainage process of a land shale oil stuffy well, and the imbibition displacement system comprises a sample (23) and a sample suspension bracket (24), wherein the sample (23) is positioned on the sample suspension bracket (24);
the magnetic levitation lifting metering system module 200 is configured to lift a core by using magnetic attraction force and meter a weight of the core by using magnetic repulsion force, and the magnetic levitation lifting metering system includes: the device comprises a first suspension wire (12), a suspension bracket (13), an inner permanent magnet (17), a second suspension wire (18), a titanium alloy pipe column (19), a third suspension wire (20) and an outer permanent magnet (21); the outer permanent magnet (21) is positioned outside the titanium alloy pipe column (19), the inner permanent magnet (17) is connected with the suspension bracket (13) through a third suspension wire (20), the inner permanent magnet (17) is positioned inside the titanium alloy pipe column (19), the second suspension wire (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 processing system module 300 is used for recording the weight of the sample (23) after imbibition replacement in real time, the data acquisition processing system comprises an electronic balance (11), the electronic balance (11) is connected with a suspension bracket (13) through a first suspension wire (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 coupling effect of magnetic field force by the suspension wire (12) 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 lifting metering system further comprises an electromagnet (14), a sliding rheostat (15) and a circuit switch (16), wherein the electromagnet (14) is fixed above the outer part of the titanium alloy pipe column (19), a first end of the sliding rheostat (15) is connected with the circuit switch (16) in series, and a second end of the sliding rheostat (15) is connected with the electromagnet (14).
In one embodiment, as shown in fig. 1, the data acquisition and processing system further comprises a computer (10), and the shale infiltration experiment device based on magnetic levitation metering further comprises a digital display instrument 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 the fluid in the core by the working fluid so as to simulate the imbibition displacement process of the fracturing fluid in the drainage process of the land shale oil stuffy well. The working fluid refers to fracturing fluid in the shale oil stuffy well extraction process, the sample refers to shale core samples, the samples can be cylindrical regular shale samples or irregular shale samples, the shale samples can be subjected to testing of the first weight of the rock samples after oil washing and drying, the shale samples are subjected to testing of the second weight of the shale samples after saturated crude oil treatment, meanwhile, the shale samples also need to be subjected to surface treatment, and specifically, at least one of all the 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-sided contact spontaneous imbibition. The magnetic levitation lifting metering system module 200 can utilize magnetic attraction force to lift the rock core and magnetic repulsion force to meter the weight of the rock core. The core lifting can be that a sample is placed on the upper part of the infiltration kettle and can be expressed as the upper part of the 1/2 position of the infiltration kettle, the core falling can be that the sample is placed on the lower part of the 1/2 position of the infiltration kettle or is immersed in working fluid, the magnetic attraction force is 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 repulsive force is the force generated by mutual repulsion between an outer permanent magnet (21) and the inner permanent magnet (17). Specifically, in one embodiment, the titanium alloy pipe column (19) is in sealing connection with the titanium alloy infiltration kettle cover (22) through threads, and the compressive strength of the titanium alloy pipe column (19) is 50MPa. The data acquisition and processing system module 300 can record the weight of the sample (23) after imbibition replacement in real time, wherein the weight data of the sample after imbibition replacement can be measured by an electronic balance, and the change condition of the weight of the sample after imbibition replacement can be monitored by 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 may be an electronic balance with a data transmission function.
Shale imbibition experimental device based on magnetic suspension metering can be suitable for shale imbibition experiments in different imbibition directions, and the device tightness is good, and is not easy to be influenced by environment. The magnetic suspension lifting metering system realizes the non-contact lifting control of the sample position, can transmit the sample weight to the electronic balance in a non-contact manner, separates the sample environment from the measuring environment, has high metering precision and can be continuously monitored in real time. The imbibition displacement system is used as the core of the whole device and is used as a place for imbibition displacement of the fluid in the core by the working fluid, so that the imbibition displacement process of the fracturing fluid on crude oil in shale can be well simulated. The data acquisition processing system utilizes a high-precision electronic balance to measure and monitor the weight of the sample after imbibition displacement in real time, so that the metering precision is improved, and the labor cost and human error are reduced.
In one embodiment, as shown in fig. 1, the shale infiltration experiment device based on magnetic levitation metering further comprises a temperature and pressure coordination control system module 400, wherein the temperature and pressure coordination control system comprises a gas cylinder (1), a piston container (28) and a first electric heating sleeve (34), the gas cylinder (1) is used for providing a high-pressure environment of 50MPa for the infiltration tank through the piston container (28), and the first electric heating sleeve (34) is used for providing a high-temperature environment of 150 ℃ for the infiltration tank and the piston container (28).
The infiltration tank can be composed of a titanium alloy infiltration tank cover and a stainless steel infiltration tank body, the 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 tank by utilizing a hand pump.
Further, in one embodiment, as shown in fig. 1, the temperature and pressure coordination 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 also 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 infiltration kettle body (35), and the first temperature control instrument (32) is connected with the first electric heating sleeve (34); pressurizing gas in a piston container (28), injecting the gas into the upper part of the infiltration kettle by utilizing a hand pump (29), and controlling the air pressure in the infiltration kettle to reach the preset gas injection pressure by a pressure sensor (9); and controlling the temperature of the first electric heating sleeve (34) by using 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 refer 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 collecting 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 utilized to inject gas into the upper part of the infiltration kettle, and the pressure of the gas in the infiltration kettle is controlled to reach the preset gas injection pressure through the control pressure sensor (9), 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 pressure of nitrogen injected into the imbibition kettle can be increased along with the rising of the temperature of the imbibition kettle, the preset nitrogen injection pressure needs to be smaller 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 a preset gas injection pressure, P is a preset experiment pressure, T1 is the indoor temperature of the device, and T is a preset experiment temperature.
The preset experimental temperature can be achieved by controlling the electric heating sleeve to heat through the temperature control instrument, and the preset experimental pressure can be finely adjusted through the hand pump. The predetermined gas may be nitrogen, and the predetermined gas injection pressure is related to a predetermined experimental pressure, a room 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-pressure coordination control system further comprises a second electric heating sleeve (27) and a second temperature control instrument (26), wherein the second electric heating sleeve (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), wherein the temperature sensor (33) is arranged in the infiltration kettle through a test point; the second electric heating sleeve (27) is controlled by the second temperature control instrument (26) to heat the pressurized gas in the piston container (28) to a preset experimental temperature; the pressure in the imbibition kettle is finely adjusted by utilizing a hand pump (29) so that the pressure in the imbibition kettle reaches a preset experimental pressure, wherein the preset gas injection pressure is smaller 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, the first two-way valve (7) is closed.
Specifically, in one embodiment, the temperature sensor (33) ranges from-20 ℃ to 150 ℃.
The pressurized gas in the piston container (28) can be nitrogen, when the nitrogen is heated to a preset experiment temperature, the pressure in the infiltration kettle is finely adjusted by using the hand pump (29) so that the pressure in the infiltration kettle reaches the preset experiment pressure, wherein the preset nitrogen injection pressure is required to be smaller than or equal to the preset experiment pressure, and the preset nitrogen injection pressure can be obtained through calculation, and specifically can be obtained through calculation according to the formula (1). 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 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 temperature and pressure coordination 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 vent 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 the third pressure gauge (3), the second end of the third pressure gauge (3) is connected with the first end of the second two-way valve (4), the second end of the second two-way valve (4) is connected with the first end of the 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).
The temperature-pressure coordination 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 the fluid in the imbibition kettle is heated, the pressure in the imbibition kettle can be changed, the high-temperature and high-pressure environment is coordinated and controlled by constructing a high-temperature and high-pressure imbibition replacement environment in the imbibition kettle, the influence of the temperature on the gas pressure is reduced by heating the fluid in the imbibition kettle and the pressurized gas in the piston container (28), the formation pressure and the temperature conditions of the shale reservoir are truly simulated, and the imbibition replacement environment of crude oil in shale can be truly reduced, so that a certain basis is provided for the subsequent research on the development of deep shale oil resources.
In one embodiment, as shown in fig. 1, the infiltration replacement system further comprises a titanium alloy infiltration kettle cover (22) and a stainless steel infiltration kettle body (35), wherein the titanium alloy infiltration kettle cover (22) is positioned at the outer side of the sample suspension bracket (24), and the titanium alloy infiltration kettle cover (22) and the stainless steel infiltration kettle body (35) are combined to form the infiltration kettle; in the experiment preparation stage, the electromagnet (14) is electrified by a closed circuit, 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 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 kettle; in the beginning of an experiment, electromagnetic force of an electromagnet (14) is reduced through a slide rheostat (15), so that an inner permanent magnet (17) and a sample (23) are lowered under the action of gravity, when the inner permanent magnet (17) is lowered to be close to the bottom of a titanium alloy tubular column (19), a 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), a sample suspension bracket (24) and the inner permanent magnet (17) is transmitted to an electronic balance (11) through coupling of the magnetic field force by a first suspension wire (12), so that the electronic balance (11) weighs the sample (23).
Specifically, in one embodiment, the bottom of the infiltration tank is designed to be magnetically stirred, the top of the infiltration tank is detachable, and the compressive strength of the infiltration tank is 50MPa.
The electronic balance can be a high-precision electronic balance, the high-precision electronic balance can be an electronic balance with the measuring range of 220g and the precision of 0.001g, and the electronic balance can be an electronic balance with a data transmission function. The conventional experimental device generally measures the imbibition experiment under the condition of normal temperature and normal pressure. Because the high-precision electronic balance cannot be placed in a high-temperature and high-pressure environment, the experimental device is difficult to measure the weight of the sample for the imbibition experiment in the high-temperature and high-pressure environment, and in order to measure the weight of the sample in the high-temperature and high-pressure environment, the sample environment and the test environment can be separated. In particular, the sample weight may be weighed using magnetic levitation technology. In the experiment preparation stage, as shown in fig. 2A, a closed circuit electrifies the electromagnet, the electromagnetic force of the electromagnet is increased through the sliding rheostat, so that magnetic attraction 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 a sample is positioned at the upper part of the infiltration kettle; in the beginning stage 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 repulsive force is generated between the outer permanent magnet and the inner permanent magnet. The weight of the sample in the infiltration kettle is transmitted to the high-precision electronic balance in a non-contact way through the magnetic field force coupling effect formed by the inner permanent magnet and the outer permanent magnet, so that the sample environment and the test environment can be separated, the high-precision electronic balance can accurately measure the weight of the sample in a high-temperature and high-pressure environment, the metering precision is high, and real-time continuous monitoring can be realized. The infiltration kettle can be composed of a titanium alloy infiltration kettle cover and a stainless steel infiltration kettle body, the bottom design of the infiltration kettle can be magnetic stirring, the top of the infiltration kettle can be disassembled, and the compressive strength of the infiltration kettle can be 50MPa.
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 vent valve (38), a fourth two-way valve (39) and a liquid cup (40); the glass window (25) is located the outside of sample suspension support (24), be located the inboard of stainless steel infiltration kettle body (35), magnetic stirring motor (36) are connected with stainless steel infiltration kettle body (35), be used for stirring the working solution, horizontal support (37) are located the below of stainless steel infiltration kettle body (35), be used for carrying out the level to stainless steel infiltration kettle body (35) and adjust, liquid relief valve (38) are connected with stainless steel infiltration kettle body (35), be used for the blowdown liquid, the first end of fourth bi-pass valve (39) is connected with stainless steel infiltration kettle body (35), the second end of fourth bi-pass valve (39) is connected with liquid cup (40), be used for leading into the working solution in liquid cup (40) to ooze in the infiltration kettle.
Specifically, in one embodiment, the glass window (25) is sapphire glass, and the compressive strength is 50MPa.
When the crude oil which is permeated and displaced is adhered to the surface of the rock core and is difficult to remove, the magnetic stirrer can be started to stir the working solution for a certain time, so that the crude oil can be better permeated out. When the working solution is led into the imbibition kettle, the conventional experimental device can firstly submerge the sample into the working solution to construct a high-temperature high-pressure environment, but larger errors can be caused to imbibition experiments, and the true imbibition replacement effect of the fracturing fluid under stratum conditions is difficult to imitate, so that the errors caused to the imbibition experiments can be avoided by firstly manufacturing the high-temperature high-pressure environment and then submerging the sample into the working solution. Specifically, the lifting control of the sample can be realized by changing electromagnetic force, the magnetic force of the electromagnet above the titanium alloy pipe column can be changed through the sliding rheostat, so that the attractive force of the electromagnet and the permanent magnet inside the titanium alloy pipe column is changed, the lifting or the lowering of the sample is controlled, the electromagnet can lose magnetism through the circuit switch, and the permanent magnet inside the titanium alloy pipe column and the permanent magnet outside the titanium alloy pipe column only form magnetic field force coupling effect. For example, in the experimental preparation stage, as shown in fig. 2A, the electromagnet is electrified by a closed circuit, the electromagnetic force of the electromagnet is increased by the sliding rheostat, so that magnetic attraction can be 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 a sample can be lifted to the upper part of the infiltration kettle; in the beginning stage 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 can be lowered under the action of gravity, when the inner permanent magnet is lowered to be close to the bottom of the titanium alloy tubular column, the circuit of the electromagnet can be disconnected, magnetic repulsion force is generated between the outer permanent magnet and the inner permanent magnet, and the sample can be lowered to the bottom.
The imbibition displacement system is used as the core of the whole device and is used as a place for imbibition displacement of the fluid in the core by the working fluid, so that the imbibition displacement process of the fracturing fluid on crude oil in shale can be well simulated.
The shale imbibition experimental device based on magnetic levitation metering comprises a processor and a memory, wherein the imbibition displacement system module 100, the magnetic levitation lifting metering system module 200, the data acquisition processing system module 300, the temperature and pressure coordination control system module 400 and the like are all 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 a imbibition assay method according to an embodiment of the application. As shown in fig. 3, in an embodiment of the present application, a imbibition experiment method is provided, where the imbibition experiment method is applied to a shale imbibition experiment device based on magnetic levitation metering, the shale imbibition experiment device based on magnetic levitation metering includes a sample suspension bracket, a magnetic levitation lifting device, an imbibition kettle, a piston container, an electronic balance, a liquid cup, and a two-way valve connected with 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:
In step 301, a sample to be measured is obtained.
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 infiltration kettle through a magnetic suspension lifting device.
And 304, injecting the prepared working fluid into a liquid cup, and injecting the working fluid in the liquid cup into the imbibition kettle.
And 305, adjusting the temperature and the pressure in the imbibition kettle to a preset experimental temperature and a preset experimental pressure.
And 306, controlling the sample to be immersed into the working solution of the infiltration kettle through the magnetic suspension lifting device.
And 307, cutting off the power supply of the magnetic levitation lifting device, and determining the weight of the sample through the electronic balance.
In step 308, in the case that the duration of the unchanged weight of the sample reaches the preset duration, it is determined that the sample completes the imbibition experiment.
The two-way valve connected with the liquid cup is a fourth two-way valve (39) in the shale permeation experiment device based on magnetic levitation 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, and the like. Specifically, the core sample may be a cylindrical regular core sample or an irregular core sample, the working fluid may be a fracturing fluid in the shale oil stuffy well drainage process, and the pressurized gas may 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 wash oil, drying, saturated crude oil treatment, surface treatment, and 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 into the sample suspension holder comprises: performing oil washing and drying operation on the sample, and determining the first weight of the sample; carrying out saturated crude oil treatment on the sample after washing oil drying, and determining a second weight of the sample after saturated crude oil treatment; and carrying out surface treatment on the sample after the saturated crude oil treatment to obtain a sample after the surface treatment, and placing the sample after the surface treatment into a sample suspension bracket.
The weight of the core sample is measured after the pretreatment of washing oil and drying, and can be determined as the first weight of the sample, and M can be used 1 Similarly, the weight of the rock sample needs to be measured and recorded again after the sample is subjected to saturated crude oil treatment after the sample is washed and dried, and the weight can be determined as the second weight of the sample, and M can be used 2 And (3) representing. And carrying out surface treatment on the sample after the saturated crude oil treatment, wherein the surface treatment can be any one of all surface unsealing, circumferential sealing and top surface sealing modes, and the corresponding imbibition mode can be any one of reverse spontaneous imbibition, forward spontaneous imbibition and single-sided contact spontaneous imbibition. The resulting surface treated sample may be placed in a hanging rack for the sample.
For step 303, after the processor pre-processes the sample, the magnetic levitation lifting device can control the sample to be kept at the upper part of the infiltration kettle, wherein the upper part of the infiltration kettle is kept at the 1/2 position of the infiltration kettle and above.
Further, in one embodiment, the magnetic levitation lifting device comprises an electromagnet, a slide rheostat, an inner permanent magnet, an outer permanent magnet, and a circuit switch; the controlling of the sample to be kept on the upper part of the imbibition kettle by the magnetic suspension lifting device comprises the following steps: the control circuit switch is communicated, the electromagnet is electrified by closing the circuit switch, the electromagnetic force of the electromagnet is increased through the sliding rheostat, so that the inner permanent magnet is attracted by the electromagnet to be positioned at the top of the titanium alloy pipe column, and a 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, and close the circuit switch to energize the electromagnet, and increase the electromagnetic force of the electromagnet through the sliding rheostat, so as to increase the magnetic attraction between the electromagnet and the inner permanent magnet, and make the inner permanent magnet be located at the top of the titanium alloy pipe column, and the sample may be kept at the upper part of the infiltration tank, i.e. at the 1/2 position of the infiltration tank and above. For step 304, the processor injects the configured working fluid into the liquid cup, and the working fluid in the liquid cup can be injected into the infiltration tank by opening the fourth two-way valve (39), wherein the working fluid is located at the 1/2 position of the infiltration tank and below.
Further, the upper part of the imbibition kettle comprises a 1/2 position and more than the region of the imbibition kettle, the prepared working solution is injected into the liquid cup, and the working solution in the liquid cup is injected into the imbibition kettle, which comprises the following steps: and injecting the prepared working solution into the liquid cup, injecting the working solution in the liquid cup into the imbibition kettle, and closing the two-way valve to stop injecting the working solution into the imbibition kettle when the liquid level position of the imbibition kettle is positioned at 1/2 position of the imbibition kettle. The working fluid 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 fluid injected into the imbibition kettle, and when the liquid level position of the working fluid injected into the imbibition kettle reaches the 1/2 position of the imbibition kettle, the processor can stop the injection of the working fluid into the imbibition kettle, in particular, the injection of the working fluid can be stopped by closing the fourth two-way valve (39). For step 305, after the processor injects the working fluid into the percolating vessel, the pressurized gas in the piston container may be injected into the upper portion of the percolating vessel, and the pressure of the injected gas may need to be adjusted to a preset experimental pressure.
Further, in one embodiment, adjusting the temperature and pressure in the percolating kettle to the preset experimental temperature and preset experimental pressure includes: injecting pressurized gas into the piston container, and injecting the pressurized gas into the imbibition kettle so that the pressure in the imbibition kettle reaches the preset gas injection pressure; under the condition 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, the pressure in the imbibition kettle is finely adjusted; and stopping injecting the pressurized gas under the condition that the pressure in the imbibition kettle reaches the preset experimental pressure, wherein the preset gas injection pressure is smaller than or equal to the preset experimental pressure.
Further, in one embodiment, the shale permeation testing device based on magnetic levitation metering further comprises a gas cylinder and a first electric heating sleeve, wherein the gas cylinder is used for providing a high-pressure environment of 50MPa for the permeation kettle through the piston container, and the first electric heating sleeve is used for providing a high-temperature environment of 150 ℃ for the permeation kettle and the piston container.
Further, in one embodiment, the preset gas injection pressure is calculated by equation (1):
wherein P1 is a preset gas injection pressure, P is a preset experiment pressure, T1 is the indoor temperature of the device, and T is a preset experiment temperature.
After the pressurized gas at normal temperature is injected into the imbibition kettle, the pressure of the gas is greatly increased when the fluid in the imbibition kettle is heated, so that the pressure in the imbibition kettle is changed, a high-temperature high-pressure imbibition replacement environment is required to be constructed in the imbibition kettle, and the high-temperature high-pressure environment can be coordinated and controlled. The pressure value of the high-pressure environment may be 50MPa, may be provided by a gas cylinder, the temperature value of the high-temperature environment may be 150 ℃, and may be provided by a first electric heating jacket. Specifically, in order to construct a high-temperature and high-pressure environment in the imbibition kettle, the processor can adjust the pressure in the imbibition kettle 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 tank by utilizing a hand pump, the injected pressurized gas is positioned at the upper part of the infiltration tank so that the pressure in the infiltration tank reaches the preset gas injection pressure, and the preset gas injection pressure can be expressed as P 1 . The processor can adopt the temperature control instrument of oozing cauldron department to heat the fluid in the oozing cauldron to preset experimental temperature, can adopt the temperature control instrument of piston container department to heat the pressurized gas in the piston container to preset experimental temperature. The piston container and the imbibition kettle can be heated by adopting the first electric heating sleeve, the pressure in the imbibition kettle can be finely adjusted by the hand pump, so that the pressure in the imbibition kettle reaches the preset experimental pressure, and when the pressure in the imbibition kettle reaches the preset experimental pressure, the injection of the pressurized gas into the imbibition kettle can be stopped by closing the two-way valve (7). With the temperature rise of the imbibition kettle, the pressurized gas can increase the selfThe pressure, and thus the preset gas injection pressure, needs to be less than the experimental pressure,
for step 306, the processor may control the sample to be immersed in the working fluid of the infiltration tank through the magnetic levitation 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 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 sample may be considered to be immersed in the working fluid of the infiltration tank.
For step 307, the processor may determine the weight of the sample by the electronic balance by switching off the power to the magnetically levitated lift device as the inner permanent magnet descends to near the bottom of the titanium alloy tubular string.
Further, in one embodiment, the shale infiltration experiment device based on magnetic levitation metering further comprises 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 levitation lifting device is cut off, and the determination of the weight of the sample through the electronic balance comprises: the electromagnet is powered off so that the outer permanent magnet and the inner permanent magnet repel each other to generate corresponding magnetic field force, and the weight of the sample, the sample suspension bracket and the inner permanent magnet is transmitted 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 the sliding 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 be close to the bottom of the titanium alloy pipe column, i.e. the sample is immersed into the working fluid, the power supply of the electromagnet can be disconnected, and the outer permanent magnet and the inner permanent magnet repel each other to generate 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 from the first suspension wire through the coupling of 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 has a data transmission function, the measuring range of the electronic balance can be 220g, and the precision is 0.001g.
For step 308, the processor may determine that the sample has completed the imbibition experiment when the duration of time that the weight of the sample has not changed has reached a preset duration. 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 experiment equipment can be closed, the core sample can be taken out, finally the experiment equipment is cleaned for the next experiment,
in one embodiment, the imbibition assay method further comprises: determining the weight of the surface-treated sample immersed in the working solution of the imbibition kettle as a third weight; acquiring the fourth weight of the sample acquired by the electronic balance in the experimental process; acquiring the experimental time spent 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 from 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 the imbibition displacement efficiency, the unit is rho o Is the density of crude oil, and the unit is g/cm 3 ，ρ w The density of the working fluid is expressed in g/cm 3 ，M 1 For a first weight, M 2 For a second weight, M 3 The third weight, M, is the fourth weight, wherein the weight is in g.
The weight of the surface treated sample is changed when the surface treated sample is immersed in the working solution of the infiltration tank, the processor can determine that the weight of the surface treated sample when the surface treated sample is immersed in the working solution of the infiltration tank is a third weight, and M can be used 3 Representing the weight of the sample collected by the electronic balance during the experiment, the weight of the sample can be obtained by the processor to be a fourth weight, and the fourth weight can be represented by M. The processor can obtain the experimental time spent by the sample to complete the permeation test, for example, after the weight data of the sample measured by the balance is kept stable for 10 hours, the test can be endedAnd closing the experimental equipment, taking out the core sample, and finally cleaning the experimental equipment to be used for the next experiment, wherein 10 hours can represent the experimental time spent by the sample for completing the imbibition experiment. The processor may be based on the first weight M 1 Second weight M 2 And determining the imbibition displacement efficiency of the sample by the third weight and the fourth weight, wherein the imbibition displacement efficiency can be calculated according to the formula (2). As shown in fig. 4, a graph of imbibition efficiency of a shale imbibition experimental method of magnetic levitation metering is provided. It can be seen that after the imbibition replacement efficiency is calculated, an image of the time-dependent change of the imbibition replacement efficiency can be drawn in combination with 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 replacement efficiency can be improved.
According to the imbibition experiment method, on one hand, the elevation of the sample position can be controlled through the magnetic suspension elevation device, the high-temperature and high-pressure environment is constructed firstly, then the sample is immersed into the working solution, the contact between the sample and the working solution is avoided, the experimental precision of the imbibition experiment is rarely affected when the working solution is added or the temperature and the pressure are regulated subsequently, and meanwhile, the real fracturing fluid replacement effect under the stratum condition can be simulated better. On the other hand, the weight of the sample can be transmitted to the electronic balance in a non-contact way through the coupling effect of magnetic field force, the sample environment is separated from the measuring environment, the measurement of the weight of the sample in the high-temperature and high-pressure environment is realized, the measurement precision is high, 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 a imbibition test method according to one embodiment. It should be understood that, although the steps in the flowchart of fig. 3 are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in fig. 3 may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor do the order in which the sub-steps or stages are performed necessarily performed in sequence, but may be performed alternately or alternately with at least a portion of the sub-steps or stages of other steps or other steps.
The processor includes a kernel, and the kernel fetches the corresponding program unit from the memory. The kernel can be provided with one or more than one, and the imbibition experimental method is realized by adjusting kernel parameters.
The memory may include volatile memory, random Access Memory (RAM), and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM), among other forms in computer readable media, the memory including at least one memory chip.
The embodiment of the 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, which is used for running a program, wherein the imbibition experimental method is executed when the program runs.
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 the processor a01 of the computer device is adapted to provide computing and control capabilities. The memory of the computer device includes internal memory a03 and nonvolatile storage medium a04. The nonvolatile 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 a04. 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 a imbibition experimental method.
The embodiment of the application provides equipment, which comprises a processor, a memory and a program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the following steps: obtaining a sample to be tested; pretreating a sample, and placing the pretreated sample into a sample hanging bracket; the sample is controlled to be kept at the upper part of the imbibition kettle through a magnetic suspension lifting device; injecting the prepared working solution into a liquid cup, and injecting the working solution in the liquid cup into a seepage kettle; adjusting the temperature and the pressure in the imbibition kettle to a preset experimental temperature and a preset experimental pressure; controlling the sample to be immersed into the working solution of the imbibition kettle through the magnetic suspension lifting device; cutting off the power supply of the magnetic suspension lifting device, and determining the weight of the sample through an electronic balance; and under the condition that the duration of unchanged weight of the sample reaches the preset duration, determining that the sample completes the imbibition experiment.
In one embodiment, the magnetic levitation lifting device controlling the sample to be kept at the upper part of the infiltration kettle comprises: the control circuit switch is communicated, the electromagnet is electrified by closing the circuit switch, the electromagnetic force of the electromagnet is increased through the sliding rheostat, so that the inner permanent magnet is attracted by the electromagnet to be positioned at the top of the titanium alloy pipe column, and a sample is kept at the upper part of the infiltration kettle.
In one embodiment, powering off the magnetic levitation lifting device and determining the weight of the sample by the electronic balance comprises: the electromagnet is powered off so that the outer permanent magnet and the inner permanent magnet repel each other to generate corresponding magnetic field force, and the weight of the sample, the sample suspension bracket and the inner permanent magnet is transmitted 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 infiltration tank comprises 1/2 position and above area of the infiltration tank, injecting the prepared working solution into the liquid cup, and injecting the working solution in the liquid cup into the infiltration tank comprises: and injecting the prepared working solution into the liquid cup, injecting the working solution in the liquid cup into the imbibition kettle, and closing the two-way valve to stop injecting the working solution into the imbibition kettle when the liquid level position of the imbibition kettle is positioned at 1/2 position of the imbibition kettle.
In one embodiment, adjusting the temperature and pressure within the percolating vessel to the predetermined experimental temperature and predetermined experimental pressure comprises: injecting pressurized gas into the piston container, and injecting the pressurized gas into the imbibition kettle so that the pressure in the imbibition kettle reaches the preset gas injection pressure; under the condition 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, the pressure in the imbibition kettle is finely adjusted; and stopping injecting the pressurized gas under the condition that the pressure in the imbibition kettle reaches the preset experimental pressure, wherein the preset gas injection pressure is smaller than or equal to the preset experimental pressure.
In one embodiment, the preset gas injection pressure is calculated by equation (1):
wherein P1 is a preset gas injection pressure, P is a preset experiment pressure, T1 is the indoor temperature of the device, and T is a preset experiment temperature.
In one embodiment, the sample is pre-treated and placing the pre-treated sample in the sample suspension holder comprises: performing oil washing and drying operation on the sample, and determining the first weight of the sample; carrying out saturated crude oil treatment on the sample after washing oil drying, and determining a second weight of the sample after saturated crude oil treatment; and carrying out surface treatment on the sample after the saturated crude oil treatment to obtain a sample after the surface treatment, and placing the sample after the surface treatment into a sample suspension bracket.
In one embodiment, the imbibition assay method further comprises: determining the weight of the surface-treated sample immersed in the working solution of the imbibition kettle as a third weight; acquiring the fourth weight of the sample acquired by the electronic balance in the experimental process; acquiring the experimental time spent 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 from 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 the imbibition displacement efficiency, the unit is rho o Is the density of crude oil, and the unit is g/cm 3 ，ρ w The density of the working fluid is expressed in g/cm 3 ，M 1 For a first weight, M 2 For a second weight, M 3 The third weight, M, is the fourth weight, wherein the weight is in g.
In one embodiment, the shale infiltration experiment device based on magnetic levitation metering further comprises a gas cylinder and a first electric heating sleeve, wherein the gas cylinder is used for providing a high-pressure environment of 50MPa for the infiltration tank through the piston container, and the first electric heating sleeve is used for providing a high-temperature environment of 150 ℃ for the infiltration tank and the piston container.
The present application also provides a computer program product adapted to perform, when executed on a data processing device, a program initialized with the method steps of: obtaining a sample to be tested; pretreating a sample, and placing the pretreated sample into a sample hanging bracket; the sample is controlled to be kept at the upper part of the imbibition kettle through a magnetic suspension lifting device; injecting the prepared working solution into a liquid cup, and injecting the working solution in the liquid cup into a seepage kettle; adjusting the temperature and the pressure in the imbibition kettle to a preset experimental temperature and a preset experimental pressure; controlling the sample to be immersed into the working solution of the imbibition kettle through the magnetic suspension lifting device; cutting off the power supply of the magnetic suspension lifting device, and determining the weight of the sample through an electronic balance; and under the condition that the duration of unchanged weight of the sample reaches the preset duration, determining that the sample completes the imbibition experiment.
In one embodiment, the magnetic levitation lifting device controlling the sample to be kept at the upper part of the infiltration kettle comprises: the control circuit switch is communicated, the electromagnet is electrified by closing the circuit switch, the electromagnetic force of the electromagnet is increased through the sliding rheostat, so that the inner permanent magnet is attracted by the electromagnet to be positioned at the top of the titanium alloy pipe column, and a sample is kept at the upper part of the infiltration kettle.
In one embodiment, powering off the magnetic levitation lifting device and determining the weight of the sample by the electronic balance comprises: the electromagnet is powered off so that the outer permanent magnet and the inner permanent magnet repel each other to generate corresponding magnetic field force, and the weight of the sample, the sample suspension bracket and the inner permanent magnet is transmitted 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 infiltration tank comprises 1/2 position and above area of the infiltration tank, injecting the prepared working solution into the liquid cup, and injecting the working solution in the liquid cup into the infiltration tank comprises: and injecting the prepared working solution into the liquid cup, injecting the working solution in the liquid cup into the imbibition kettle, and closing the two-way valve to stop injecting the working solution into the imbibition kettle when the liquid level position of the imbibition kettle is positioned at 1/2 position of the imbibition kettle.
In one embodiment, adjusting the temperature and pressure within the percolating vessel to the predetermined experimental temperature and predetermined experimental pressure comprises: injecting pressurized gas into the piston container, and injecting the pressurized gas into the imbibition kettle so that the pressure in the imbibition kettle reaches the preset gas injection pressure; under the condition 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, the pressure in the imbibition kettle is finely adjusted; and stopping injecting the pressurized gas under the condition that the pressure in the imbibition kettle reaches the preset experimental pressure, wherein the preset gas injection pressure is smaller than or equal to the preset experimental pressure.
In one embodiment, the preset gas injection pressure is calculated by equation (1):
/>
wherein P1 is a preset gas injection pressure, P is a preset experiment pressure, T1 is the indoor temperature of the device, and T is a preset experiment temperature.
In one embodiment, the sample is pre-treated and placing the pre-treated sample in the sample suspension holder comprises: performing oil washing and drying operation on the sample, and determining the first weight of the sample; carrying out saturated crude oil treatment on the sample after washing oil drying, and determining a second weight of the sample after saturated crude oil treatment; and carrying out surface treatment on the sample after the saturated crude oil treatment to obtain a sample after the surface treatment, and placing the sample after the surface treatment into a sample suspension bracket.
In one embodiment, the imbibition assay method further comprises: determining the weight of the surface-treated sample immersed in the working solution of the imbibition kettle as a third weight; acquiring the fourth weight of the sample acquired by the electronic balance in the experimental process; acquiring the experimental time spent 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 from 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 the imbibition displacement efficiency, the unit is rho o Is the density of crude oil, and the unit is g/cm 3 ，ρ w The density of the working fluid is expressed in g/cm 3 ，M 1 For a first weight, M 2 For a second weight, M 3 The third weight, M, is the fourth weight, wherein the weight is in g.
In one embodiment, the shale infiltration experiment device based on magnetic levitation metering further comprises a gas cylinder and a first electric heating sleeve, wherein the gas cylinder is used for providing a high-pressure environment of 50MPa for the infiltration tank through the piston container, and the first electric heating sleeve is used for providing a high-temperature environment of 150 ℃ for the infiltration tank and the piston container.
It will be appreciated by those skilled in the art that 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. 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 storage media for a computer 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, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
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 one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.

Claims (13)

1. Shale infiltration experiment device based on magnetic levitation metering, characterized in that the device includes:
the seepage displacement system is used for providing a place for carrying out seepage displacement on fluid in a rock core by working fluid so as to simulate a fracturing fluid seepage displacement process in a land shale oil stuffy well drainage process, and comprises a sample (23), a sample suspension bracket (24), a titanium alloy seepage kettle cover (22) and a stainless steel seepage kettle body (35), wherein the sample (23) is positioned on the sample suspension bracket (24), the titanium alloy seepage kettle cover (22) is positioned on the outer side of the sample suspension bracket (24), and the titanium alloy seepage kettle cover (22) and the stainless steel seepage kettle body (35) are combined to form a seepage kettle;
the utility model provides a magnetic suspension lift metering system for utilize magnetic attraction to carry out rock core lift and utilize magnetic repulsion to carry out the measurement of rock core weight, magnetic suspension lift metering system includes: the device comprises a first suspension wire (12), a suspension bracket (13), an inner permanent magnet (17), a second suspension wire (18), a titanium alloy pipe column (19), a third suspension wire (20), an outer permanent magnet (21), an electromagnet (14), a slide rheostat (15) and a circuit switch (16);
The outer permanent magnet (21) is located outside the titanium alloy pipe column (19), the inner permanent magnet (17) is located inside the titanium alloy pipe column (19) through the third suspension wire (20) and connected with the suspension bracket (13), the second suspension wire (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, 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 electromagnet (14) is fixed above the outside of the titanium alloy pipe column (19), the first end of the sliding rheostat (15) is connected with the circuit switch (16) in series, and the second end of the sliding rheostat (15) is connected with the electromagnet (14);
the data acquisition and processing system is used for recording the weight of the sample (23) after imbibition replacement in real time and comprises an electronic balance (11), wherein the electronic balance (11) is connected with the suspension bracket (13) through the first suspension wire (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 coupling action of the magnetic field force by the suspension wire (12) so as to monitor the change condition of the weight of the sample (23) through the electronic balance (11);
In the experiment preparation stage, the electromagnet (14) is electrified by a closed circuit, the electromagnetic force of the electromagnet (14) is increased through the sliding 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;
at the beginning of the experiment, the electromagnetic force of the electromagnet (14) is reduced through the slide rheostat (15), so that the inner permanent magnet (17) and the sample (23) are lowered under the action of gravity, when the inner permanent magnet (17) is lowered to be close to the bottom of the titanium alloy tubular 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 hanging bracket (24) and the inner permanent magnet (17) is transmitted to the electronic balance (11) through the coupling of the magnetic field force, so that the electronic balance (11) weighs the sample (23).
2. The apparatus of claim 1, further comprising a temperature and pressure coordination control system comprising a gas cylinder (1), a piston container (28), and a first electrical heating jacket (34), the gas cylinder (1) being configured to provide a high pressure environment of 50MPa for the suction still through the piston container (28), the first electrical heating jacket (34) being configured to provide a high temperature environment of 150 ℃ for the suction still and the piston container (28).
3. The device according to claim 2, wherein the temperature and pressure coordination 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 also 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 infiltration 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 using 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.
4. A device according to claim 3, characterized in that the temperature and pressure coordination control system further comprises a second electric heating jacket (27) and a second temperature control instrument (26), the second electric heating jacket (27) being connected to the piston container (28) and the second temperature control instrument (26), respectively;
the data acquisition and processing system further comprises a temperature sensor (33), wherein the temperature sensor (33) is arranged in the imbibition kettle through a test point;
controlling the second electric heating sleeve (27) to heat the pressurized gas in the piston container (28) to the preset experimental temperature through the second temperature control instrument (26); the pressure in the imbibition kettle is finely adjusted by utilizing the hand pump (29) so that the pressure in the imbibition kettle reaches a preset experimental pressure, wherein the preset gas injection pressure is smaller 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, the first two-way valve (7) is closed.
5. The device according to claim 4, characterized in that the temperature sensor (33) has a measuring range of-20 ℃ to 150 ℃.
6. A device according to claim 3, wherein the preset gas injection pressure is calculated by equation (1):
wherein P1 is a preset gas injection pressure, P is a preset experiment pressure, T1 is an indoor temperature of the device, and T is the preset experiment temperature.
7. A device according to claim 3, characterized in that the temperature and pressure coordination 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 venting 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 the third pressure gauge (3), the second end of the third pressure gauge (3) is connected with the first end of the second two-way valve (4), the second end of the second two-way valve (4) is connected with the first end of the 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).
8. The device according to claim 7, 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);
The glass window (25) is located the outside of sample suspension support (24), is located the inboard of stainless steel infiltration kettle body (35), magnetic stirring motor (36) with stainless steel infiltration kettle body (35) are connected for stir the working solution, horizontal support (37) are located the below of stainless steel infiltration kettle body (35), are used for right the level of stainless steel infiltration kettle body (35) is adjusted, liquid blow-off valve (38) with stainless steel infiltration kettle body (35) are connected, are used for the blowdown liquid, the first end of fourth two-way valve (39) with stainless steel infiltration kettle body (35) are connected, the second end of fourth two-way valve (39) with liquid cup (40) are connected, are used for with the working solution in liquid cup (40) is imported into the infiltration kettle.
9. The device according to claim 8, characterized in that the glass window (25) is sapphire glass, with a compressive strength of 50MPa.
10. The device according to claim 8, wherein the data acquisition and processing system further comprises a computer (10), and the shale infiltration experiment device based on magnetic levitation metering further comprises a digital display instrument 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).
11. The device according to claim 1, wherein the bottom of the infiltration tank is designed as magnetic stirring, the top of the infiltration tank is detachable, and the compressive strength of the infiltration tank is 50MPa.
12. The device according to claim 1, characterized in that the electronic balance (11) has a data transmission function, and the electronic balance (11) has a measuring range of 220g and an accuracy of 0.001g.
13. The device according to claim 1, characterized in that a titanium alloy pipe column (19) is in sealing connection with the titanium alloy infiltration tank cover (22) through threads, and the compressive strength of the titanium alloy pipe column (19) is 50MPa.
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