Device and method for optimizing oil storage and injection operation parameters of high-impurity salt mine sediment voids

Abstract

The application provides a high-impurity salt mine sediment void oil storage injection and production operation parameter optimization device and method, the device comprises a transparent heat-insulating pressure-resistant safety box, an acrylic salt cavity, an oil injection and production assembly, a brine injection and production assembly, an air compression assembly, a temperature regulation assembly and a sealing assembly, can simulate the whole process of sediment void oil storage injection and production of a salt cavity and a double salt cavity (U-shaped cavity) of a salt mine, can realize the whole process of injection and production of different sediment gradations, different oil injection / brine injection rates and pressures, and different ground temperature conditions, can obtain the oil injection and production rates and brine injection and production rates under different injection and production conditions and the sediment void oil storage recovery rate, can obtain the oil / brine / gas displacement micro-flowing conditions in the sediment void, so as to determine the sediment void oil storage volume and oil storage capacity of the salt mine, and establish the sediment oil storage injection and production operation adjustment parameters. The application can simulate the injection and production working conditions in the real underground salt cavity, realize the whole process control of the sediment void oil storage, and explore the feasibility of the oil production by gas injection.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of salt cavern sediment gap oil storage, and particularly relates to a high-impurity salt mine sediment gap oil storage injection and production operation parameter optimization device and method. BACKGROUND

[0002] Underground salt caverns are excellent places for underground energy reserves. Underground salt cavern oil storage has been widely used in the United States, France, Germany and other countries. At present, underground salt cavern oil storage has not been applied in the field in China.

[0003] Domestic salt rock strata differ greatly from foreign salt rock strata. The characteristics of more interbeds, thicker interbeds, more insoluble impurities in salt layers, and thinner salt layers result in a large number of insoluble sediment particles during the salt cavern cavity forming process. The sediment particles occupy a large amount of salt cavern space, which seriously affects the ability of the salt cavern to store oil. However, these insoluble sediment particles contain a large number of voids, which can account for more than 40% of the sediment accumulation body. Therefore, using sediment gap oil storage is an excellent method for improving underground salt cavern oil reserves with high impurities. Monitoring the parameters (oil injection rate, oil production rate, brine injection rate, brine discharge rate, oil loss rate, oil recovery rate, and sediment gap rate) during the operation of the sediment gap oil storage has important value for the application of salt cavern sediment gap oil storage. There is an urgent need for a sediment oil storage experimental device that can dynamically monitor the entire process. At present, there are few experimental devices for adjusting and controlling the injection and production parameters of the sediment gap oil storage.

[0004] Therefore, how to provide a high-impurity salt mine sediment gap oil storage injection and production operation parameter optimization device to simulate the injection and production operation process of salt cavern sediment oil storage, analyze the feasibility of different sediment gap oil storage, and provide experimental basis for the development of large-scale underground salt cavern sediment gap oil storage is a technical problem that those skilled in the art need to solve. SUMMARY

[0005] The purpose of the present application is to provide a high-impurity salt mine sediment gap oil storage injection and production operation parameter optimization device and method to at least solve the above-mentioned technical problem.

[0006] To achieve the above-mentioned objectives, the first aspect of the present invention provides a high-impurity salt mine sediment void storage oil injection and production operation parameter optimization device, the device comprising: a transparent heat-insulating and pressure-resistant safety box, a first acrylic salt chamber, the first acrylic salt chamber being arranged on one side of the interior of the transparent heat-insulating and pressure-resistant safety box for holding sediment particles; a first oil injection and production component, the first oil injection and production component being connected to the top of the first acrylic salt chamber; a second acrylic salt chamber, the second acrylic salt chamber being arranged on the other side of the interior of the transparent heat-insulating and pressure-resistant safety box for holding sediment particles; a second oil injection and production component, the second oil injection and production component being connected to the top of the second acrylic salt chamber; a brine injection and production component, the brine injection and production component being connected to the bottom of the first acrylic salt chamber, and the brine injection and production component being connected to the bottom of the second acrylic salt chamber; a high-speed camera, the high-speed camera being arranged outside the transparent heat-insulating and pressure-resistant safety box for recording the entire process of sediment void storage oil injection and production operation.

[0007] In the first aspect, the first oil injection and production component includes: a first oil reservoir, which is connected to the top of the first acrylic salt chamber through a first oil pipe, and a first oil injection valve and a first flow meter are provided on the first oil pipe, a first cooling component is provided at the interface between the first oil pipe and the first acrylic salt chamber, and a first temperature detector and a first saturated vapor pressure detector are provided in the first oil reservoir; a first oil injection pressure regulator, which is connected to the first oil reservoir and is used to adjust the injection pressure of the oil in the first oil reservoir; a first oil weigher, which is used to weigh the weight of the oil in the first oil reservoir; a first oil injection and production rate collector, which is connected to the first oil weigher and is used to record the injection and production rate of the oil in the first oil reservoir; and a first filter, which is used to filter the oil in the first oil reservoir.

[0008] In the first aspect, the second oil injection and production assembly includes: a second oil reservoir, which is connected to the top of the second acrylic salt chamber through a second oil pipe, and a second oil injection valve and a second flow meter are provided on the second oil pipe, a second cooling assembly is provided at the interface between the second oil pipe and the second acrylic salt chamber, and a second temperature detector and a second saturated vapor pressure detector are provided in the second oil reservoir; a second oil injection pressure regulator, which is connected to the second oil reservoir and is used to adjust the injection pressure of the oil in the second oil reservoir; a second oil weigher, which is used to weigh the weight of the oil in the second oil reservoir; a second oil injection and production rate collector, which is connected to the second oil weigher and is used to record the injection and production rate of the oil in the second oil reservoir; and a second filter, which is used to filter the oil in the second oil reservoir.

[0009] In the first aspect, the injection-production brine assembly comprises: an intermediate injection-production brine pipe connected with the bottom of the first acrylic salt cavity through a first water pipe, connected with the bottom of the second acrylic salt cavity through a second water pipe, provided with a first stop valve on the first water pipe, provided with a second stop valve on the second water pipe, and provided with a third cooling assembly on the outer wall of the intermediate injection-production brine pipe; a brine reservoir connected with the intermediate injection-production brine pipe and arranged outside the transparent heat-insulating pressure-resistant safety box, provided with a third temperature detector inside; a brine scale for weighing the weight of the brine in the brine reservoir; a brine pressure regulator connected with the brine reservoir for adjusting the injection pressure of the brine in the brine reservoir; and a brine injection-production rate collector connected with the brine scale for recording the injection-production rate of the brine in the brine reservoir; wherein the intermediate injection-production brine pipe is provided with an injection-production brine valve, a brine pressure gauge and an injection-production brine valve, the brine pressure gauge is located in the middle of the intermediate injection-production brine pipe, the injection-production brine valve is arranged between the brine pressure gauge and the brine scale, and the injection-production brine valve is arranged between the brine pressure gauge and the first water pipe.

[0010] In the first aspect, the device further comprises: a first air compression assembly connected with the first acrylic salt cavity through a first main pipe for injecting air into the first acrylic salt cavity; a first oil product control valve arranged on the first main pipe, and a first cavity pressure gauge arranged between the first oil product control valve and the first acrylic salt cavity; a second air compression assembly connected with the second acrylic salt cavity through a second main pipe for injecting air into the second acrylic salt cavity; a second oil product control valve arranged on the second main pipe, and a second cavity pressure gauge arranged between the second oil product control valve and the second acrylic salt cavity; a temperature control assembly for adjusting the temperature of the first acrylic salt cavity and the second acrylic salt cavity to simulate the real underground salt cavity temperature; and a sealing assembly for sealing the first acrylic salt cavity and the second acrylic salt cavity.

[0011] In the first aspect, the first air compression assembly comprises: a first air compressor, a first air pipe and a first air compression valve arranged on the first air pipe; one end of the first air pipe is connected with the first air compressor, and the other end of the first air pipe is connected with the first main pipe; and the second air compression assembly comprises: a second air compressor, a second air pipe and a second air compression valve arranged on the second air pipe; one end of the second air pipe is connected with the second air compressor, and the other end of the second air pipe is connected with the second main pipe.

[0012] In the first aspect, the temperature control assembly comprises: a first temperature sensor arranged on the inner wall of the first acrylic salt cavity; a second temperature sensor arranged on the inner wall of the second acrylic salt cavity; a heating hole arranged at the top end of the inside of the transparent heat-insulating pressure-resistant safety box; a temperature controller connected with the first temperature sensor, the second temperature sensor and the heating hole.

[0013] The second aspect of the present application provides a method for optimizing injection and production operation parameters of oil in high-impurity salt mine sediment voids, which comprises the following steps: connecting the salt mine sediment void oil injection and production operation parameter optimization device according to the first aspect, and checking the sealing performance of the experimental device; under the condition that the sealing performance of the experimental device is good, putting sediment particles into the first and second acrylic salt cavities respectively, adding the oil to be tested into the first and second oil storage devices respectively, and adding brine into the brine storage device to complete the preparation work before the experiment; testing the porosity of the sediment particles; filling the first and second acrylic salt cavities with brine, and starting the temperature controller and the heating hole to make the first and second acrylic salt cavities reach the preset geothermal environment to simulate the initial state of the salt cavity; connecting the first and second oil storage devices with the brine storage device respectively to conduct the sediment void oil injection and brine displacement experiment, record the oil injection rate and brine displacement rate, and record the whole process of oil injection and brine displacement by a high-speed camera; conducting the sediment void oil storage test, starting the temperature controller and the heating hole when the first and second acrylic salt cavities and the sediment particles are filled with the oil to be tested to make the first and second acrylic salt cavities reach the preset geothermal environment; connecting the brine storage device with the first and second oil storage devices respectively to conduct the sediment void brine injection and oil production experiment, record the oil production rate and brine injection rate, and record the whole process of brine injection and oil production by a high-speed camera; filtering the oil collected in the first oil storage device through the first filter, filtering the oil collected in the second oil storage device through the second filter to calculate the sediment content and analyze the quality of the collected oil; analyzing the recorded test data to optimize the sediment void oil injection and production operation parameters.

[0014] In the second aspect, the experimental method further comprises: replacing sediment particles with different particle gradations, brine with different concentrations and oil with different types to conduct the oil injection and brine displacement experiment or the brine injection and oil production experiment, and after the experiment, performing CT and nuclear magnetic resonance scanning on the sediment particles to analyze the degradation ability of the sediment particles.

[0015] The third aspect of the present application provides a method for optimizing injection and production operation parameters of high-impurity salt mine sediment void oil storage, which comprises: installing the salt mine sediment void oil storage injection and production operation parameter optimization device according to the first aspect and ensuring the sealing of the device; determining the particle size distribution of the sediment particles through interlayer collapse experiments and water-soluble experiments; optimizing and analyzing the injection and production operation parameters through the salt mine sediment void oil storage injection and production operation parameter experimental method and the control variable method according to the second aspect; adjusting the injection and production rates of the target oil product and the displacement liquid, and replacing different types of oil products and different concentrations of displacement liquids, while analyzing the physical and chemical performance indicators of the sediment void produced oil product, on the basis of ensuring the sediment void oil production capacity, so as to determine the optimal storage oil product, displacement liquid type and injection and production rate; adjusting different ground temperatures and different formation pressures according to the types of oil products and their saturated vapor pressures and sediment void plugging conditions, so as to determine the burial depth of different types of oil products in the salt cavern; adjusting the number of injection and production operations according to the degradation performance of the sediment particles and the pressure in the device, so as to determine the injection and production cycle period of the sediment void oil storage; adjusting the particle size distribution of the sediment particles and the sediment content according to the size of the sediment void oil production amount; determining the optimal parameter range of the sediment content, temperature, injection and production rate and pressure in the sediment void oil storage injection and production operation process, determining the types of stored oil products and displacement liquids, and providing guidance for the actual salt cavern sediment oil storage injection and production operation parameters, so as to realize the efficient operation of the high-impurity salt cavern sediment oil storage.

[0016] Advantages:

[0017] The application provides a high-impurity salt mine sediment void oil storage injection and production operation parameter optimization device, which comprises a transparent heat-insulating pressure-resistant safety box, a first acrylic salt cavity, a first oil injection and production assembly, a second acrylic salt cavity, a second oil injection and production assembly, a brine injection and production assembly and a high-speed camera. The first acrylic salt cavity is arranged on one side in the interior of the transparent heat-insulating pressure-resistant safety box, and the second acrylic salt cavity is arranged on the other side in the interior of the transparent heat-insulating pressure-resistant safety box. Both the first acrylic salt cavity and the second acrylic salt cavity are used for containing sediment particles to simulate a salt mine salt cavity. The first oil injection and production assembly is connected with the top of the first acrylic salt cavity, and the second oil injection and production assembly is connected with the top of the second acrylic salt cavity, so as to inject an oil product to be tested into the first acrylic salt cavity and the second acrylic salt cavity for storage or displacement of original brine in the salt cavity. The brine injection and production assembly is connected with the bottom of the first acrylic salt cavity and the bottom of the second acrylic salt cavity, and is used for injecting brine into the first acrylic salt cavity and the second acrylic salt cavity. The high-speed camera is used for recording the whole process of the sediment void oil storage injection and production operation, obtaining the void ratio of the sediment particles in the salt cavity, and then analyzing the feasibility of the sediment void oil storage. The experimental device provided by the application can be used to simulate the whole process of the salt cave sediment void oil storage injection and production operation. By replacing sediment particles with different particle gradations and different oil products, and observing the oil and brine displacement phenomenon in the first acrylic salt cavity or the second acrylic salt cavity through the transparent heat-insulating pressure-resistant safety box, the feasibility of the sediment void oil storage of different particle gradations and different oil product varieties can be analyzed. The application can simulate the brine pressure, crude oil pressure, product oil pressure and ground temperature conditions of the real underground salt cavity, analyze the feasibility and oil storage capacity of the sediment void storage of crude oil and product oil, establish the operation condition parameter optimization adjustment (oil injection rate, oil production rate, brine injection rate, brine discharge rate, oil product loss rate, oil product recovery rate and sediment void ratio) of the real underground salt cavity sediment oil storage, and verify the feasibility of the air oil displacement, so that the salt mine single cavity and double cavity (U-shaped cavity) sediment void oil storage experiments can be carried out, and good indoor experimental conditions are provided for the development of the large-scale underground salt cave sediment void oil storage. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below only show some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0019] Figure 1 It is a structural schematic diagram of the high-impurity salt mine sediment void oil storage injection and production operation parameter optimization device in the present application.

[0020] Figure 2 It is a flow chart of the high-impurity salt mine sediment void oil storage injection and production operation experimental method in the present application.

[0021] Figure 3 Figure 1 is a graph of the relationship between the brine discharge rate and time during the oil injection and brine discharge experiment in the present application;

[0022] Figure 4 Figure 2 is a graph of the relationship between the oil injection rate and time during the oil injection and brine discharge experiment in the present application;

[0023] Figure 5 Figure 3 is a flow chart of the method for optimizing the operation parameters of the oil storage in the voids of the high-impurity salt mine sediment in the present application;

[0024] Reference signs:

[0025] 1. A transparent heat-insulating pressure-resistant safety box;

[0026] 2. A first acrylic salt cavity; 201, a first main pipe; 202, a first oil product control valve; 203, a first cavity pressure gauge;

[0027] 3. A first oil injection and extraction assembly; 301, a first oil storage device; 302, a first oil pipe; 303, a first oil injection valve; 304, a first flow meter; 305, a first oil injection pressure controller; 306, a first oil weighing device; 307, a first oil injection and extraction rate collector;

[0028] 4. A second acrylic salt cavity; 401, a second main pipe; 402, a second oil product control valve; 403, a second cavity pressure gauge;

[0029] 5. A second oil injection and extraction assembly; 501, a second oil storage device; 502, a second oil pipe; 503, a second oil injection valve; 504, a second flow meter; 505, a second oil injection pressure controller; 506, a second oil weighing device; 507, a second oil injection and extraction rate collector;

[0030] 6. An oil injection and extraction brine assembly; 601, an intermediate oil injection and discharge brine pipe; 602, a first water pipe; 603, a second water pipe; 604, a first stop valve; 605, a second stop valve; 606, a brine storage device; 607, a brine weighing device; 608, a brine pressure controller; 609, a brine injection and discharge rate collector; 610, a brine injection and discharge valve; 611, a brine pressure gauge; 612, a brine injection and extraction valve;

[0031] 7. A first air compression assembly; 701, a first air compressor; 702, a first air pipe; 703, a first air compression valve;

[0032] 8. A second air compression assembly; 801, a second air compressor; 802, a second air pipe; 803, a second air compression valve;

[0033] 9, temperature regulating assembly; 901, first temperature sensor; 902, second temperature sensor; 903, heating hole; 904, temperature controller;

[0034] 10, sealing assembly; 1001, first pressure sealing ring; 1002, first pressure regulating bolt; 1003, second pressure sealing ring; 1004, second pressure regulating bolt;

[0035] 11, bottom support;

[0036] 12, sediment particle. DETAILED DESCRIPTION

[0037] The technical solutions in the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0038] Meanwhile, in the embodiments of the present application, when an assembly is referred to as "fixed" to another assembly, it can be directly on the other assembly or there can be a middle assembly. When an assembly is referred to as "connected" to another assembly, it can be directly connected to the other assembly or there can be a middle assembly. When an assembly is referred to as "disposed" on another assembly, it can be directly disposed on the other assembly or there can be a middle assembly.

[0039] In addition, in the present application, the description such as "first", "second" and the like is only for the purpose of description and cannot be understood as indicating or implying the relative importance of the technical features or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it, and when the combination of technical solutions appears to be contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0040] Embodiment one:

[0041] Please refer to Figure 1The application provides a high-impurity salt mine sediment gap oil storage injection and production operation parameter optimization device, which comprises a transparent heat-insulating pressure-resistant safety box 1, a first acrylic salt cavity 2, a first injection and production oil assembly 3, a second acrylic salt cavity 4, a second injection and production oil assembly 5 and a high-speed camera.

[0042] Specifically, the high-impurity salt mine sediment gap oil storage injection and production operation parameter optimization device comprises the transparent heat-insulating pressure-resistant safety box 1, the first acrylic salt cavity 2, the first injection and production oil assembly 3, the second acrylic salt cavity 4, the second injection and production oil assembly 5, the injection and production brine assembly 6 and the high-speed camera. The first acrylic salt cavity 2 is arranged on one side in the interior of the transparent heat-insulating pressure-resistant safety box 1, and the second acrylic salt cavity 4 is arranged on the other side in the interior of the transparent heat-insulating pressure-resistant safety box 1. The first acrylic salt cavity 2 and the second acrylic salt cavity 4 are both used for containing sediment particles 12 to simulate a salt mine salt cavity. The first injection and production oil assembly 3 is connected with the top of the first acrylic salt cavity 2, and the second injection and production oil assembly 5 is connected with the top of the second acrylic salt cavity 4, so as to inject an oil product to be tested into the first acrylic salt cavity 2 and the second acrylic salt cavity 4 to store or displace original brine in the salt cavity. The injection and production brine assembly 6 is connected with the bottom of the first acrylic salt cavity 2 and the bottom of the second acrylic salt cavity 4, and is used for injecting brine into the first acrylic salt cavity 2 and the second acrylic salt cavity 4. The high-speed camera is arranged outside the transparent heat-insulating pressure-resistant safety box 1 and is used for recording the whole process of the sediment gap oil storage injection and production operation, so as to obtain the porosity of the sediment particles 12 in the salt cavity, and then the feasibility of the sediment gap oil storage can be analyzed. The experimental device provided by the application can be used to simulate the injection and production operation process of the salt cave sediment oil storage. By replacing the sediment particles 12 with different particle gradations and observing the oil and brine displacement phenomenon in the first acrylic salt cavity 2 or the second acrylic salt cavity 4 through the transparent heat-insulating pressure-resistant safety box 1, the feasibility of different sediment gap oil storages can be analyzed, and an experimental basis is provided for the development of large-scale underground salt cave sediment gap oil storage.

[0043] In some possible embodiments, the first injection-production oil component 3 comprises a first oil reservoir 301 connected with the top of the first acrylic salt cavity 2 through a first oil pipe 302, a first oil injection valve 303 and a first flow meter 304 arranged on the first oil pipe 302, a first cooling component arranged at the interface of the first oil pipe 302 and the first acrylic salt cavity 2, a first temperature detector and a first saturated vapor pressure detector arranged in the first oil reservoir 301, a first oil injection pressure regulator 305 connected with the first oil reservoir 301 for adjusting the injection pressure of the oil in the first oil reservoir 301, a first oil weight scale 306 for weighing the weight of the oil in the first oil reservoir 301, and a first injection-production oil rate collector 307 connected with the first oil weight scale 306 for recording the injection-production oil rate of the oil in the first oil reservoir 301.

[0044] As understood by those skilled in the art, the first injection-production oil component 3 comprises the first oil reservoir 301, the first oil injection pressure regulator 305, the first oil weight scale 306 and the first injection-production oil rate collector 307. The first oil reservoir 301 is used to store the oil to be tested, the oil to be tested is input into the first acrylic salt cavity 2 through the first oil pipe 302, the first oil injection valve 303 and the first flow meter 304 are arranged on the first oil pipe 302 to observe the injection rate, further, the first cooling component is arranged at the interface of the first oil pipe 302 and the first acrylic salt cavity 2 to cool the produced oil from the first acrylic salt cavity 2, so that the produced oil is stored in the first oil reservoir 301, and the first temperature detector and the first saturated vapor pressure detector are arranged in the first oil reservoir 301 to monitor the cooled produced oil, so as to obtain the cooling efficiency of the oil after production at different temperatures, and the first filter is used to filter the produced oil to analyze the quality of the produced oil and the crushing degree of the sludge particles, so as to determine the injection-production operation parameters. In addition, the first oil injection pressure regulator is connected with the first oil reservoir 301 to adjust the injection pressure of the oil injected into the first acrylic salt cavity 2, so that the injection pressure meets the formation pressure, which facilitates the development of the sludge void oil storage injection-production experiment under different formation pressures, and the first oil weight scale 306 is used to weigh the mass of the oil in the first oil reservoir 301 during the experiment, and the first injection-production oil rate collector 307 is used to record the experimental data during the experiment.

[0045] In some possible embodiments, the second oil injection and production assembly 5 comprises a second oil reservoir 501 connected to the top of the second acrylic salt cavity 4 through a second oil pipe 502, a second oil injection valve 503 and a second flow meter 504 arranged on the second oil pipe 502, a second cooling assembly arranged at the interface between the second oil pipe 502 and the second acrylic salt cavity 4, a second temperature detector and a second saturated vapor pressure detector arranged in the second oil reservoir 501, a second oil injection pressure regulator 505 connected to the second oil reservoir 501 for adjusting the injection pressure of the oil in the second oil reservoir 501, a second oil weight scale 506 for weighing the weight of the oil in the second oil reservoir 501, a second injection and production rate collector 507 connected to the second oil weight scale 506 for recording the injection and production rate of the oil in the second oil reservoir 501, and a second filter for filtering the oil in the second oil reservoir.

[0046] In order to simulate the oil injection and production in the sediment gap of the double salt cavities, the second oil injection and production assembly 5 is arranged to inject oil into the second acrylic salt cavity 4, and the second oil injection and production assembly 5 is arranged in the same way as the first oil injection and production assembly 3. The oil produced from the second acrylic salt cavity 4 is cooled by the second cooling assembly, and then stored in the second oil reservoir 501. The second temperature detector and the second saturated vapor pressure detector arranged in the second oil reservoir 501 are used to monitor the cooled oil, obtain the cooling efficiency of the oil after production at different temperatures, and analyze the quality of the produced oil and the crushing degree of the sediment particles by filtering the produced oil with the second filter, so as to optimize the injection and production operation parameters. In specific embodiments, the oil storage capacity of the sediment gap in the double salt cavities is evaluated by combining the experimental data recorded by the first injection and production rate collector 307 and the second injection and production rate collector 507, and the detection data of the oil in the first acrylic salt cavity 2 and the second acrylic salt cavity 4. The relationship between the quality of the oil stored in the salt cavities at different temperatures and the quality of the produced oil and the whole injection and production operation process is analyzed, so as to establish safe and efficient sediment gap oil storage injection and production operation parameters.

[0047] In addition, during the oil production process, the effect of the ground temperature changes the saturated vapor pressure of the oil. By arranging the cooling assembly at the oil outlet of the salt cavity and arranging the temperature detector and the saturated vapor pressure detector in the oil reservoir, the temperature change, the vapor pressure change and the cooling efficiency of the produced oil can be analyzed, and then the best injection and production rate of different oils at different temperatures can be obtained. The influence of the ground temperature, the oil properties and the injection and production rate on the produced oil is analyzed, the saturated vapor pressure of different oils is analyzed to prevent the generation of a lot of gas, the safety of transportation is maintained, and thus the best type of sediment storage oil and the depth of the salt cavity are determined.

[0048] In some possible embodiments, the injection-production brine assembly 6 comprises: an intermediate injection-production brine pipe 601 connected with the bottom of the first Perspex salt cavity 2 through a first water pipe 602, and connected with the bottom of the second Perspex salt cavity 4 through a second water pipe 603, wherein a first stop valve 604 is arranged on the first water pipe 602, a second stop valve 605 is arranged on the second water pipe 603, and an outer wall of the intermediate injection-production brine pipe 601 is provided with a third cooling assembly; a brine reservoir 606 connected with the intermediate injection-production brine pipe 601 and arranged outside the transparent heat-insulating pressure-resistant safety box 1, wherein a third temperature detector is arranged in the brine reservoir 606; a brine scale 607 for weighing the weight of brine in the brine reservoir 606; a brine pressure regulator 608 connected with the brine reservoir 606 and used for adjusting the injection pressure of brine in the brine reservoir 606; and a brine injection-production rate collector 609 connected with the brine scale 607 and used for recording the injection-production rate of brine in the brine reservoir 606; wherein the intermediate injection-production brine pipe 601 is provided with an injection-production brine valve 610, a brine pressure gauge 611 and an injection-production brine valve 612, the brine pressure gauge 611 is located in the middle of the intermediate injection-production brine pipe 601, the injection-production brine valve 610 is arranged between the brine pressure gauge 611 and the brine scale 607, and the injection-production brine valve 612 is arranged between the brine pressure gauge 611 and the first water pipe 602.

[0049] The skilled in the art can understand that the injection-production brine component 6 comprises an intermediate injection-discharge brine pipe 601, a brine reservoir 606, a brine scale 607, a brine pressure regulator 608 and a brine injection-discharge rate collector 609. The intermediate injection-discharge brine pipe 601 is connected with the bottom of the first acrylic salt cavity 2 through a first water pipe 602, and is connected with the bottom of the second acrylic salt cavity 4 through a second water pipe 603. The first water pipe 602 and the second water pipe 603 converge at one end of the intermediate injection-discharge brine pipe 601, so as to facilitate the brine reservoir 606 to inject brine into the first acrylic salt cavity 2 and the second acrylic salt cavity 4 at the same time. Further, a first stop valve 604 is arranged on the first water pipe 602, and a second stop valve 605 is arranged on the second water pipe 603. By closing the first stop valve 604 or the second stop valve 605, a single salt cavity sediment void oil storage experiment can be carried out. The other end of the intermediate injection-discharge brine pipe 601 is connected with the brine reservoir 606, and a brine injection-discharge valve 610 is arranged near the brine reservoir 606. The brine reservoir 606 is arranged outside the transparent heat-insulating pressure-resistant safety box 1, so as to facilitate adding brine or collecting brine in the brine reservoir 606. The brine pressure regulator 608 is connected with the brine reservoir 606, so as to regulate the pressure of the brine injected into the salt cavity. The weight of the brine is weighed by the brine scale 607, so as to calculate the void ratio of the sediment particles 12 in the salt cavity, and the experimental data in the experimental process are recorded by the brine injection-discharge rate collector 609. In addition, the brine injection-discharge valve 610, a brine pressure gauge 611 and a brine injection-production valve 612 are arranged in the intermediate injection-discharge brine pipe 601 in sequence away from the brine reservoir 606. By arranging the brine pressure gauge 611 between the brine injection-discharge valve 610 and the brine injection-production valve 612, the pressure in the intermediate injection-discharge brine pipe 601 in the oil injection-discharge or brine injection-production experimental process can be directly understood.

[0050] It needs to be supplemented that the liquid stored in the brine reservoir 606 can be brine or fresh water with different concentrations. By replacing different displacement liquids, the oil in the salt cavity is displaced, and the detection data in the oil injection-discharge and brine injection-production experimental process, the running condition of the sediment particles and the oil recovery rate are combined to analyze the whole process of the sediment void oil storage injection-production operation, so as to determine the best displacement liquid, the type of oil and the injection-production rate, and provide an indoor experimental basis for large-scale underground salt cavern sediment void oil storage.

[0051] In addition, the temperature and the rate of the displacement liquid can be changed in the present application, the sediment void oil production capacity (oil production and oil production rate) under different temperatures and different displacement liquid rates is analyzed, and the best displacement liquid type and displacement temperature are determined. The displacement temperature can be realized by the salt layer burial depth of the field engineering.

[0052] In some possible implementation manners, the device further comprises: a first air compression assembly 7 connected with the first acrylic salt cavity 2 through a first main pipe 201, for injecting air into the first acrylic salt cavity 2; a first oil product control valve 202 is arranged on the first main pipe 201, and a first cavity pressure gauge 203 is arranged between the first oil product control valve 202 and the first acrylic salt cavity 2; a second air compression assembly 8 connected with the second acrylic salt cavity 4 through a second main pipe 401, for injecting air into the second acrylic salt cavity 4; a second oil product control valve 402 is arranged on the second main pipe 401, and a second cavity pressure gauge 403 is arranged between the second oil product control valve 402 and the second acrylic salt cavity 4; a temperature control assembly 9, for adjusting the temperature of the first acrylic salt cavity 2 and the second acrylic salt cavity 4 to simulate the real underground salt cavity temperature; and a sealing assembly 10, for sealing the first acrylic salt cavity 2 and the second acrylic salt cavity 4.

[0053] The device provided by the application further comprises the first air compression assembly 7, the second air compression assembly 8, the temperature control assembly 9 and the sealing assembly 10. The first air compression assembly 7 is connected with the first acrylic salt cavity 2 through the first main pipe 201, for injecting air into the first acrylic salt cavity 2 to discharge the brine or oil product in the sediment particles 12, and the first oil product control valve 202 is arranged on the first main pipe 201, and the first cavity pressure gauge 203 is arranged at the top end of the first acrylic salt cavity 2, to accurately display the actual pressure in the first acrylic salt cavity 2. Based on the same principle, the second air compression assembly 8 is connected with the second acrylic salt cavity 4 through the second main pipe 401, for injecting air into the second acrylic salt cavity 4 to discharge the brine or oil product in the sediment particles 12, and the second oil product control valve 402 is arranged on the second main pipe 401, and the second cavity pressure gauge 403 is arranged between the second oil product control valve 402 and the second acrylic salt cavity 4, to accurately display the actual pressure in the second acrylic salt cavity 4. Meanwhile, the pressure in the salt cavity is adjusted by combining the first oil product injection pressure controller 305 and the second oil product injection pressure controller 505, so that the pressure in the salt cavity conforms to the actual formation pressure. The temperature of the first acrylic salt cavity 2 and the second acrylic salt cavity 4 is controlled by the temperature control assembly 9, to simulate the real underground salt cavity temperature, and then the temperature and pressure of the underground salt cavity are simulated, so that the oil injection and production in the sediment void of the salt mine is simulated, the operation parameters of the sediment oil storage are established, and experimental basis is provided for the development of the sediment void oil storage in the actual underground salt cavity.

[0054] In some possible implementation manners, the first air compression assembly 7 comprises a first air compressor 701, a first air pipe 702, and a first air compression valve 703 arranged on the first air pipe 702; one end of the first air pipe 702 is connected with the first air compressor 701, and the other end of the first air pipe 702 is connected with the first main pipe 201; the second air compression assembly 8 comprises a second air compressor, a second air pipe 802, and a second air compression valve 803 arranged on the second air pipe 802; one end of the second air pipe 802 is connected with the second air compressor, and the other end of the second air pipe 802 is connected with the second main pipe 401.

[0055] In some possible implementation manners, the temperature control assembly 9 comprises a first temperature sensor 901 arranged on an inner wall of the first acrylic salt cavity 2, a second temperature sensor 902 arranged on an inner wall of the second acrylic salt cavity 4, a heating hole 903 arranged at a top end inside the transparent heat-insulating pressure-resistant safety box 1, and a temperature controller 904 connected with the first temperature sensor 901, the second temperature sensor 902, and the heating hole 903.

[0056] As can be understood by those skilled in the art, the temperature control assembly comprises the first temperature sensor 901, the second temperature sensor 902, the heating hole 903, and the temperature controller 904, and the first temperature sensor 901, the second temperature sensor 902, and the heating hole 903 are all connected with the temperature controller 904; the first temperature sensor 901 arranged on the inner wall of the first acrylic salt cavity 2 can accurately sense the temperature in the first acrylic salt cavity 2, and the second temperature sensor 902 arranged on the inner wall of the second acrylic salt cavity 4 can also accurately sense the temperature in the second acrylic salt cavity 4; the temperature controller 904 controls the heating hole 903 to heat the transparent heat-insulating pressure-resistant safety box 1, so as to adjust the temperatures of the first acrylic salt cavity 2 and the second acrylic salt cavity 4 to be consistent with the geothermal environment, thereby enabling the sediment gap oil storage experiment.

[0057] Further, in order to improve the sealing performance of the first and second sub-acrylic salt chambers 2 and 4, the sealing assembly 10 comprises: a first pressure sealing ring 1001 arranged at the connection between the first sub-acrylic salt chamber 2 and the first main pipe 201; a first pressure regulating bolt 1002 arranged at the first pressure sealing ring 1001; a second pressure sealing ring 1003 arranged at the connection between the second sub-acrylic salt chamber 4 and the second main pipe 401; and a second pressure regulating bolt 1004 arranged at the second pressure sealing ring 1003. The first pressure sealing ring 1001 is arranged at the connection between the first sub-acrylic salt chamber 2 and the first main pipe 201, the second pressure sealing ring 1003 is arranged at the connection between the second sub-acrylic salt chamber 4 and the second main pipe 401, and the pressure in the first and second sub-acrylic salt chambers 2 and 4 is adjusted by the first and second pressure regulating bolts 1002 and 1004.

[0058] In addition, the device further comprises a bottom support 11 arranged at the bottom end in the transparent heat-insulating pressure-resistant safety box 1 and abutting against the outer walls of the first and second sub-acrylic salt chambers 2 and 4 to fix the first and second sub-acrylic salt chambers 2 and 4.

[0059] In summary, the first and second sub-acrylic salt chambers 2 and 4 jointly constitute the salt chamber simulation system of the present application, which is used for containing the sediment particles and simulating the ground temperature and formation pressure; the first and second oil injection and production assemblies 3 and 5 constitute the oil injection and production monitoring system of the present application; the oil injection and production brine assembly 6 constitutes the injection and discharge brine monitoring system of the present application; and the first and second air compression assemblies 7 and 8 constitute the air displacement system of the present application, which is used for simulating the injection and production conditions in the real underground salt chamber and monitoring the flow rate, pressure, temperature, oil quality, saturated vapor pressure and degradation capacity of the sediment particles during the injection and production process. The above monitoring data are processed by a computer to determine the relationship between the oil storage and injection capacity of the sediment particles with different particle gradations under different injection pressures, temperatures and injection and production rates. The high-impurity salt mine sediment void oil storage and injection operation parameter optimization device provided by the present application can simulate the sediment void oil storage and injection operation process of the single and double salt chambers (U-shaped chamber) of the salt mine, measure the dischargeable brine amount of the sediment particles 12 with different particle gradations under different injection pressures and temperatures and different injection and production conditions, obtain the oil production rate and brine discharge rate under different injection and production conditions, and observe the phenomenon of oil and brine displacement in the sediment particle 12 void, thereby determining the feasibility of the sediment void oil storage, establishing the sediment oil storage operation parameters, and providing experimental basis for the development of the underground salt cave sediment void oil storage.

[0060] Example 2

[0061] Please refer to Figure 2The application provides a high-impurity salt mine sediment void oil storage injection and production operation experiment method, and the method comprises the following steps:

[0062] The salt mine sediment void oil storage injection and production operation parameter optimization device according to the first aspect is connected, and the sealing of the experimental device is checked;

[0063] In the case that the sealing of the device is good, the sediment particles 12 are respectively put into the first and second acrylic salt cavities 2 and 4, the oil to be tested is respectively added into the first and second oil storage devices 301 and 501, and the brine is added into the brine storage device 606, so as to complete the preparation work before the experiment.

[0064] The porosity of the sediment particles 12 is tested.

[0065] The first and second acrylic salt cavities 2 and 4 are filled with brine, and the temperature controller 904 and the heating hole 903 are started, so that the first and second acrylic salt cavities 2 and 4 reach the preset geothermal environment, to simulate the initial state of the salt cavity.

[0066] The first and second oil storage devices 301 and 501 are respectively communicated with the brine storage device 606, the sediment void oil injection and brine displacement experiment is carried out, the oil injection rate and the brine displacement rate are recorded, and the whole process of the oil injection and brine displacement is recorded by a high-speed camera.

[0067] The oil storage test of the sediment void is carried out, when the first and second acrylic salt cavities 2 and 4 and the sediment particles 12 are filled with the oil to be tested, the temperature controller 904 and the heating hole 903 are started, so that the first and second acrylic salt cavities 2 and 4 reach the preset geothermal environment.

[0068] The brine storage device 606 is respectively communicated with the first and second oil storage devices 301 and 501, to carry out the sediment void brine injection and oil production experiment, the oil production rate and the brine injection rate are recorded, and the whole process of the brine injection and oil production is recorded by a high-speed camera.

[0069] The oil collected in the first oil storage device 301 is filtered through the first filter, and the oil collected in the second oil storage device 501 is filtered through the second filter, to calculate the sediment content and analyze the quality of the collected oil.

[0070] The recorded detection data are analyzed, to optimize the sediment void oil storage injection and production operation parameters.

[0071] The method further comprises: replacing the different particle gradations of the sediment particles, different concentrations of the brine, and different kinds of oil products to perform an oil injection and brine displacement experiment or a brine injection and oil production experiment; and after the experiment, performing CT and nuclear magnetic scanning on the sediment particles to analyze the degradation capacity of the sediment particles.

[0072] Specifically, the application provides a high-impurity salt mine sediment void oil storage injection and production operation experiment method. Taking the double-salt cavity salt cave sediment void oil injection and injection and brine discharge experiment as an example, first, the experimental device in Example 1 is installed and connected, the brine pressure control device is opened, the first acrylic salt cavity 2 and the second acrylic salt cavity 4 are filled with brine, and whether there is water leakage at the pipeline connection of the experimental device is observed. If there is leakage, it should be repaired in time to ensure the sealing of the experimental device. Secondly, under the condition that the sealing of the experimental device is good, the first pressure control screw 1002 and the second pressure control screw 1002 are opened, and the sediment particles 12 are put into the first acrylic salt cavity 2 and the second acrylic salt cavity 4. The volume ratio of the sediment particles 12 is estimated by the comprehensive solubility of the simulated cavity salt layer. After the sediment particles 12 are placed, the first pressure control screw 1002 and the second pressure control screw 1004 are tightened, and the oil to be tested is added to the first oil storage device 301 and the second oil storage device 501 respectively, and the brine is added to the brine storage device 606 to complete the preparation work before the experiment. Then, the porosity of the sediment particles 12 is tested, that is, the volume of the sediment particles 12 that can discharge brine, the first oil injection valve 303 and the second oil injection valve 503 are closed, the first air compression valve 703, the first oil product control valve 202, the second air compression valve 803, the second oil product control valve 402, the injection and production brine valve 612, the injection and discharge brine valve 610, the first stop valve 604 and the second stop valve 605 are opened to form two passages of brine storage device 606→intermediate injection and discharge brine pipe 601→first water pipe 602→first acrylic salt cavity 2→first main pipe 201→first air pipe 702→first air compressor 701 and brine storage device 606→intermediate injection and discharge brine pipe 601→second water pipe 603→second acrylic salt cavity 4→second main pipe 401→second air pipe 802→second air compressor, and the brine pressure controller 608 and the brine weighing device 607 are started to transport brine to the first acrylic salt cavity 2 and the second acrylic salt cavity 4 respectively. After the brine fills the first water pipe 602 and the first water pipe 602 respectively, the sediment particles 12 at the bottom of the first acrylic salt cavity 2 and the second acrylic salt cavity 4 are recorded, and the mass of the brine at this time is m0. Since the void part of the sediment particles 12 will absorb part of the brine, the brine interface will not immediately level with the sediment particles 12 interface, so the brine is input until the brine interface in the first acrylic salt cavity 2 and the second acrylic salt cavity 4 is balanced with the sediment particles 12 interface, and the mass of the brine at this time is m1 and the height of the brine interface is h. At this time, the height of the brine interface is the height h of the sediment particles 12. The comprehensive solubility of the cavity salt layer is estimated. Assuming that the comprehensive solubility of the cavity salt layer is c, the volume of the acrylic salt cavity is V1, and the swelling coefficient of the sediment particles is k, then the volume V2 of the sediment particles 12 is V1×(1-c)×k, and the height h of the sediment particles 12 is V2 / πr 2wherein r is the radius of the subalumyte cavity; then, the first air compressor 701 and the second air compressor are started to inject gas into the first subalumyte cavity 2 and the second subalumyte cavity 4 respectively to displace the brine in the interstice of the sediment particles 12, as the gas is injected, until the brine reaches the bottom of the sediment particles 12, the mass of the brine at this time is recorded as m, then the volume of the brine-displaceable sediment particles 12 V3 = m2 / ρ, and the porosity of the sediment particles 12 w = m2 / ρ x πr 2 h wherein p is the density of the brine; finally, the first air compressor 701 and the second air compressor are closed, and the brine continues to be delivered to the first subalumyte cavity 2 and the second subalumyte cavity 4 until the salt cavities are filled, i.e. the initial state of the salt cavities is simulated, the temperature controller 904 and the heating hole 903 are started to simulate the geothermal environment at different depths, the temperature in the salt cavities is adjusted by the temperature controller, and the temperature inside the salt cavities is detected in real time by the temperature sensor arranged inside the salt cavities, so as to ensure that the temperature set by the temperature controller 904 can be truly applied to the brine or oil product in the salt cavities, thereby improving the accuracy of the experiment;

[0073] Further, on the basis of the above, carry out the oil injection and brine discharge experiment of the sediment void, close the first air compression valve 703, the second air compression valve 803, the temperature controller 904 and the heating hole 903, open the first oil injection valve 303 and the second oil injection valve 503, to form two passages of the first oil reservoir 301→the first oil pipe 302→the first main pipe 201→the first acrylic salt cavity 2→the first water pipe 602→the intermediate injection and discharge pipe 601→the brine reservoir 606 and the second oil reservoir 501→the second oil pipe 502→the second main pipe 401→the second acrylic salt cavity 4→the second water pipe 603→the intermediate injection and discharge pipe 601→the brine reservoir 606, start the first injection and production rate collector 307, the first oil product weigher 306, the first oil product injection pressure regulator 305, the second injection and production rate collector 507, the second oil product weigher 506, the second oil product injection pressure regulator 505 and the brine injection and discharge rate collector 609, so that the oil to be tested enters the first acrylic salt cavity 2 and the second acrylic salt cavity 4 respectively, and the injection rate and the brine discharge rate are recorded to draw the rate change curve; record the whole process picture of the oil injection and brine discharge by the high-speed camera, and set the monitoring rate of the high-speed camera to be consistent with the collection rate of the first injection and production rate collector, the second injection and production rate collector and the brine injection and discharge rate collector, when the oil-brine interface drops to the bottom of the first acrylic salt cavity 2 and the second acrylic salt cavity 4, close the injection and discharge valve 610, continue to inject the oil to be tested into the first acrylic salt cavity 2 and the second acrylic salt cavity 4, so that the sediment void in the salt cavity is filled with the oil to be tested, when the first acrylic salt cavity 2 and the second acrylic salt cavity 4 reach the preset formation pressure, stop the first oil product injection pressure regulating device and the second oil product injection pressure regulating device, close the first oil product regulating valve 202, the second oil product regulating valve 402 and the injection and production brine valve to stop the oil injection and brine discharge experiment, wherein different oils to be tested can be used, such as diesel oil, gasoline, kerosene and mineral oil, and different injection pressures can be set; after the oil injection and brine discharge experiment is completed, the oil storage test of the sediment void can be carried out, after the salt cavity and the sediment particles 12 are filled with the oil to be tested, start the temperature controller 904 and the heating hole 903 to heat the salt cavity, so that it reaches the set geothermal environment, and set the storage time to simulate the long-term oil storage process of the sediment void in the high temperature and high pressure environment, and analyze the feasibility of the oil storage of the sediment void;

[0074] Further, on the basis of the above, carry out the brine injection and oil displacement experiment in the sediment void, close the first air compression valve 703 and the second air compression valve 803, open the injection and displacement brine valve 610, to form the brine reservoir 606→the intermediate injection and displacement brine pipe 601→the first water pipe 602→the first acrylic salt chamber 2→the first main pipe 201→the first oil pipe 302→the first oil reservoir 301 and the brine reservoir 606→the intermediate injection and displacement brine pipe 601→the second water pipe 603→the second acrylic salt chamber 4→the second main pipe 401→the second oil pipe 502 pipe→the second oil reservoir 501 two passages, because the density of the oil to be tested is less than the density of the brine, when the brine reservoir 606 and the brine pressure regulator 608 are started, the oil to be tested in the salt chamber and the sediment particle 12 void will be displaced by the brine, the oil to be tested enters the first oil reservoir 301 and the second oil reservoir 501 respectively and is collected and utilized, and the oil-brine displacement process is recorded by a high-speed camera. In addition, through the above experimental device, multiple rounds of injection and production cycles of the oil to be tested can be carried out, the porosity and permeability of the sediment particle 12 sample are measured, and the degradation performance of the sediment particle 12 sample is analyzed, thereby providing a theoretical basis for underground salt cavern sediment void oil storage.

[0075] In addition, when the oil to be tested in the sediment void is displaced, an air oil displacement method can also be used, which specifically includes: closing the second air compression valve 803 and the injection and displacement brine valve 610, opening the first air compression valve 703, starting the first air compressor 701, to form the first air compressor 701→the first air pipe 702→the first main pipe 201→the first acrylic salt chamber 2→the first water pipe 602→the second water pipe 603→the second acrylic salt chamber 4→the second main pipe 401→the second oil pipe 502→the second oil reservoir 501 passage, so that the first air compressor 701 injects air into the first acrylic salt chamber 2, first completes the oil displacement work in the first acrylic salt chamber 2 and its sediment void, continues to inject air, so that the oil in the second acrylic salt chamber 4 and its sediment void is displaced to the second oil reservoir 501 for collection and utilization;

[0076] Alternatively, close the first air compression valve 703 and the injection and displacement brine valve 610, open the second air compression valve 803, start the second air compressor 801, to form the second air compressor 801→the second air pipe 802→the second main pipe 401→the second acrylic salt chamber 4→the second water pipe 603→the first water pipe 602→the first acrylic salt chamber 2→the first main pipe 201→the first oil pipe 302→the first oil reservoir 301 passage, so that the second air compressor 801 injects air into the second acrylic salt chamber 4, first completes the oil displacement work in the second acrylic salt chamber 4 and its sediment void, continues to inject air, so that the oil in the first acrylic salt chamber 2 and its sediment void is displaced to the first oil reservoir 301 for collection and utilization, thereby verifying the feasibility of air oil displacement.

[0077] Further, the oil collected in the first oil reservoir is filtered through the first filter, and the oil collected in the second oil reservoir is filtered through the second filter, so as to calculate the content of the sediment in the oil and analyze the quality of the produced oil. If the content of the sediment in the oil is very high, it indicates that the flowability of the sediment particles is good, the crushing degree of the sediment particles is large, and there are many small particles, and the injection-production operation parameters need to be optimized to reduce the content of the sediment in the produced oil.

[0078] After the injection of oil and the displacement of brine and the injection of brine and the production of oil are completed, the experimental results are analyzed, as shown in the following table. Figures 3-4 The change of the injection rate and the production rate of brine is analyzed, the change trend of the injection rate and the production rate of oil is analyzed, and the oil recovery of the sediment oil is analyzed. The specific formula is that the mass of the injected oil on both sides is m3, the mass of the produced oil is m4, and the oil recovery is A = (m4-m3) / m3. The change relationship of the oil production rate under different temperatures and different particle size distributions is established, which provides a basis for the selection of the cavity depth and the interlayer thickness in the actual salt mine sediment oil storage project.

[0079] Figure 3 The injection rate of oil is the injection rate of oil in the process of injection of oil and displacement of brine. The overall displacement rate of brine does not fluctuate obviously up and down, the minimum displacement rate of brine is 1 g / s, and the maximum displacement rate of brine is 6 g / s. Figure 4 The injection rate of oil is the injection rate of oil in the process of injection of oil and displacement of brine. The overall displacement rate of brine does not fluctuate obviously up and down, the minimum displacement rate of brine is 1 g / s, and the maximum displacement rate of brine is 6 g / s.

[0080] In addition, the device provided in the present application can also be used for injection of oil and displacement of brine and injection of brine and production of oil. The oil storage capacity of the sediment particles before and after the experiment can be compared, the sediment particles before and after the experiment are scanned by CT and nuclear magnetic resonance, the degradation capacity of the sediment particles is further analyzed, and the crushing degree of the sediment at the bottom of the salt cavity is analyzed. The pressure difference between the two ends is calculated through the pressure gauges at the top of the salt cavity on both sides and the brine pressure gauges on the middle brine displacement pipe. If the pressure difference is large, the sediment particles at the bottom of the salt cavity are blocked, the degradation capacity of the sediment particles is too strong, and the injection-production operation parameters need to be optimized to improve the connectivity of the sediment particles and the maximum sediment void oil production.

[0081] By CT and nuclear magnetic scanning of the sediment particles, and in combination with the pressure difference of two ends and the quality control of the produced oil product, the injection-production operation parameters can be continuously adjusted until the best produced oil product is obtained, and then the relationship between the best oil-brine injection-production cycle parameters (ensuring that the sediment void is not blocked) and the best oil product quality (the smallest carried sediment particles) is determined, thereby providing a reference basis for actual engineering applications.

[0082] In the above experiment of oil injection and brine drainage in the sediment void of the double-salt-cavity salt cavern, the first stop valve 604 or the second stop valve 605 is closed, so that the oil injection and brine drainage, oil storage and oil production by brine injection in the sediment void of the single-salt-cavity salt cavern can be realized.

[0083] In summary, the high-impurity salt mine sediment void oil storage injection-production operation experiment method provided by the present application can simulate the whole process of oil storage injection-production in the sediment void of a single-salt-cavity or double-salt-cavity (U-shaped cavity) salt mine, can realize the whole process control of oil injection and brine drainage and oil production by brine injection under different particle gradation of sediment particles, different oil / brine injection rates and pressures, and different ground temperature conditions, can obtain the oil production rate and brine drainage rate under different injection-production conditions and the recovery rate of the sediment void oil storage, can obtain the micro-flowing conditions of oil-brine / gas displacement in the sediment void, and can determine the oil storage volume and oil storage capacity of the salt mine sediment void and establish suitable sediment oil storage injection-production operation adjustment parameters. The present application can simulate the high temperature and high pressure and injection-production working conditions in the real underground salt cavity, realize the whole process control of the sediment void oil storage, and explore the feasibility of oil production by gas injection.

[0084] Example Three

[0085] Please refer to Figure 5 The present application further provides a high-impurity salt mine sediment void oil storage injection-production operation parameter optimization method, which comprises the following steps:

[0086] The salt mine sediment void oil storage injection-production operation parameter optimization device according to the first aspect is installed and the sealing property of the device is ensured;

[0087] The particle gradation of the sediment particles is determined through the interlayer collapse experiment and the water-solubility experiment;

[0088] The injection-production operation parameters are optimized and analyzed by the salt mine sediment void oil storage injection-production operation parameter experiment method according to the second aspect and the control variable method;

[0089] On the basis of ensuring the sediment void oil production capacity, the injection-production rates of the target oil product and the displacement liquid are adjusted, different types of oil products and different concentrations of displacement liquids are replaced, and the physical and chemical performance indexes of the sediment void produced oil product are analyzed, so as to determine the best storage oil product, the type of displacement liquid and the injection-production rate thereof;

[0090] According to the types of oil products, the saturated vapor pressure and the sediment void plugging condition, the different ground temperatures and different formation pressures are adjusted to determine the burial depth of different types of oil products in the salt cavern;

[0091] According to the degradation performance of the sediment particles and the pressure in the device, the number of injection-production operations is adjusted to determine the injection-production cycle period of the sediment void oil storage;

[0092] According to the size of the sediment oil production, the particle size distribution and the sediment content of the sediment particles are adjusted;

[0093] Through computer processing and analysis of the correlation of the operation parameters, the optimal parameter range of the sediment content, temperature, injection-production rate and pressure in the injection-production operation process of the sediment void oil storage is determined, the types of the stored oil products and the displacement liquid are determined, and specific guidance is provided for the actual injection-production parameters of the sediment void oil storage, so as to realize the efficient operation of the high-impurity salt cavern sediment oil storage.

[0094] Specifically, the injection-production operation parameters of the sediment void oil storage are optimized through the sediment oil storage experimental device and the test method, the experimental device is installed according to the experimental device provided in Example 1, and the sealing property of the experimental device is ensured; the sediment particle size distribution is determined through the interlayer collapse experiment and the water-soluble experiment; the injection-production operation parameters are optimized and analyzed through the control variable method for oil injection and brine discharge and oil injection and oil production experiments; on the basis of ensuring the sediment void oil production capacity, the injection-production rate of the target oil product and the displacement liquid is adjusted, and different types of oil products and different concentrations of displacement liquids are replaced, and the physicochemical performance indicators of the sediment void produced oil product are analyzed, so as to determine the optimal storage oil product, displacement liquid type and injection-production rate, wherein the physicochemical performance indicators of the sediment void produced oil product can be tested by a viscometer, a moisture content tester, an anti-emulsification performance tester, a sediment content analyzer and the like, so as to obtain the viscosity, water content, emulsification performance, sediment particle content, chemical stability, sulfur content and other key technical indicators of the sediment void produced oil product; according to the types of oil products, the saturated vapor pressure and the sediment void plugging condition, the different ground temperatures and different formation pressures are adjusted to determine the burial depth of different types of oil products in the salt cavern; according to the degradation performance of the sediment and the pressure of the device, the number of injection-production operations is adjusted to determine the injection-production cycle period of the sediment oil storage; according to the size of the sediment oil production, the particle size distribution and the sediment content of the sediment are adjusted, the above parameters are recorded and processed by a computer, and the correlation of the parameters is analyzed, so as to determine the optimal parameter range of the sediment content, temperature, injection-production rate and pressure in the sediment oil storage operation process, determine the types of the stored oil products and displacement liquids, and continuously perform injection-production operation parameter optimization tests until the optimal injection-production operation parameters are obtained, so as to provide specific guidance for the actual injection-production parameters of the sediment void oil storage, and realize the efficient operation of the high-impurity salt cavern sediment oil storage.

[0095] Since the second embodiment and the third embodiment are one embodiment under the same inventive concept as the first embodiment, and some structures are completely the same, the structures of the second embodiment and the third embodiment which are substantially the same as those of the first embodiment will not be described in detail, and the parts not described in detail can be referred to the first embodiment.

[0096] Finally, it should be noted that the above embodiments are merely specific embodiments of the present application, which are used to illustrate the technical solutions of the present application, but not to limit the present application. The protection scope of the present application is not limited to this. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can make modifications or easily think of changes to the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some technical features, without departing from the technical scope of the present application. These modifications, changes or replacements do not make the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application. They should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

[0097] Although the embodiments of the present application have been disclosed as above, they are not limited to the applications listed in the specification and the embodiments, and can be fully applied to various fields suitable for the present application. Those skilled in the art can easily make further modifications, and therefore the present application is not limited to specific details and the figures shown and described herein, without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. A device for optimizing the operation parameters of void oil storage and injection production in high-impurity salt mine sediments, characterized in that: The device comprises: Transparent heat-insulating and pressure-resistant safety box, a first acrylic salt chamber, which is arranged on one side of the interior of the transparent heat-insulating and pressure-resistant safety box and is used to hold sediment particles; a first oil injection and production assembly connected to the top of the first acrylic salt chamber; a second acrylic salt chamber, which is arranged on the other side of the transparent heat-insulating and pressure-resistant safety box and is used to hold sediment particles; a second oil injection and production assembly connected to the top of the second acrylic salt chamber; A brine injection and production assembly, wherein the brine injection and production assembly is connected to the bottom of the first acrylic salt chamber, and the brine injection and production assembly is connected to the bottom of the second acrylic salt chamber; A high-speed camera is provided outside the transparent heat-insulating and pressure-resistant safety box and is used to record the entire process of the sediment gap oil storage and injection operation; The first oil injection and production assembly comprises: a first oil reservoir, the first oil reservoir being connected to the top of the first acrylic salt chamber via a first oil pipe, and a first oil filling valve and a first flow meter being provided on the first oil pipe; a first cooling assembly being provided at the interface between the first oil pipe and the first acrylic salt chamber; and a first temperature detector and a first saturated vapor pressure detector being provided in the first oil reservoir; a first oil product injection pressure regulator, connected to the first oil reservoir, for regulating the injection pressure of the oil product in the first oil reservoir; a first oil weighing device, used for weighing the oil in the first oil reservoir; a first oil injection and production rate collector, connected to the first oil product weighing device, for recording the injection and production rate of the oil product in the first oil reservoir; a first filter, configured to filter the oil in the first oil reservoir; The second oil injection and production assembly comprises: a second oil reservoir, the second oil reservoir being connected to the top of the second acrylic salt chamber via a second oil pipe, a second oil filling valve and a second flow meter being provided on the second oil pipe, a second cooling assembly being provided at the interface between the second oil pipe and the second acrylic salt chamber, and a second temperature detector and a second saturated vapor pressure detector being provided in the second oil reservoir; a second oil product injection pressure regulator, connected to the second oil reservoir, for regulating the injection pressure of the oil product in the second oil reservoir; a second oil weighing device, used for weighing the weight of the oil in the second oil reservoir; a second oil injection and production rate collector, connected to the second oil product weighing device, for recording the injection and production rate of the oil product in the second oil reservoir; a second filter, for filtering the oil in the second oil reservoir; The brine injection and production component includes: An intermediate brine injection and discharge pipe, the intermediate brine injection and discharge pipe is connected to the bottom of the first acrylic salt chamber through a first water pipe, the intermediate brine injection and discharge pipe is connected to the bottom of the second acrylic salt chamber through a second water pipe, a first stop valve is provided on the first water pipe, a second stop valve is provided on the second water pipe, and a third cooling assembly is provided on the outer wall of the intermediate brine injection and discharge pipe; a brine reservoir connected to the intermediate brine injection and discharge pipe and arranged outside the transparent heat-insulating and pressure-resistant safety box, wherein a third temperature detector is arranged in the brine reservoir; a brine weigher, used for weighing the brine in the brine storage tank; a brine pressure regulator connected to the brine reservoir and used to adjust the injection pressure of the brine in the brine reservoir; a brine injection and withdrawal rate collector, connected to the brine weigher, for recording the injection and withdrawal rate of brine in the brine reservoir; Among them, the intermediate brine injection and discharge pipe is provided with a brine injection and discharge valve, a brine pressure gauge and a brine injection and production valve, and the brine pressure gauge is located in the middle of the intermediate brine injection and discharge pipe, the brine injection and discharge valve is arranged between the brine pressure gauge and the brine weigher, and the brine injection and production valve is arranged between the brine pressure gauge and the first water pipe.

2. The device for optimizing operating parameters of void oil storage and production in high-impurity salt mine sediment according to claim 1 is characterized in that: The device further comprises: a first air compression assembly connected to the first acrylic salt chamber via a first main pipe, for injecting air into the first acrylic salt chamber; a first oil control valve is provided on the first main pipe, and a first cavity pressure gauge is provided between the first oil control valve and the first acrylic salt chamber; a second air compression assembly connected to the second acrylic salt chamber via a second main pipe, for injecting air into the second acrylic salt chamber; a second oil control valve is provided on the second main pipe, and a second cavity pressure gauge is provided between the second oil control valve and the second acrylic salt chamber; A temperature control component, used to adjust the temperature of the first acrylic salt chamber and the second acrylic salt chamber to simulate the temperature of a real underground salt chamber; A sealing assembly is used to seal the first acrylic salt chamber and the second acrylic salt chamber.

3. The device for optimizing operating parameters of void oil storage and production in high-impurity salt mine sediment according to claim 2, characterized in that: The first air compression assembly includes: a first air compressor, a first air pipe, and a first air compression valve, wherein the first air compression valve is arranged on the first air pipe; one end of the first air pipe is connected to the first air compressor, and the other end of the first air pipe is connected to the first main pipe; The second air compression assembly includes: a second air compressor, a second air pipe and a second air compression valve, and the second air compression valve is arranged on the second air pipe; one end of the second air pipe is connected to the second air compressor, and the other end of the second air pipe is connected to the second main pipe.

4. The device for optimizing operating parameters of void oil storage and production in high-impurity salt mine sediment according to claim 3 is characterized in that: The temperature control component includes: a first temperature sensor, the first temperature sensor being arranged on an inner wall of the first acrylic salt chamber; a second temperature sensor, the second temperature sensor being arranged on an inner wall of the second acrylic salt chamber; A heating hole, the heating hole being arranged at the top end of the interior of the transparent heat-insulating and pressure-resistant safety box; A temperature controller is connected to the first temperature sensor, the temperature controller is connected to the second temperature sensor, and the temperature controller is connected to the heating hole.

5. Experimental method for void oil storage and injection production in high-impurity salt mine sediment, characterized by: The method comprises: Connect the device for optimizing the operation parameters of the high-impurity salt mine slag interstitial oil storage and injection according to claim 4, and check the sealing performance of the device; When the sealing of the device is intact, sediment particles are placed into the first acrylic salt chamber and the second acrylic salt chamber respectively, the oil to be tested is added into the first oil reservoir and the second oil reservoir respectively, and brine is added into the brine reservoir to complete the preparation work before the experiment; Testing the porosity of the sediment particles; The first acrylic salt chamber and the second acrylic salt chamber are filled with brine, and the temperature controller and the heating hole are activated so that the first acrylic salt chamber and the second acrylic salt chamber reach a preset ground temperature environment to simulate the initial state of the salt chamber; The first oil reservoir and the second oil reservoir are connected to the brine reservoir respectively, and an oil injection and brine removal experiment is carried out in the sediment gap, and the oil injection rate and brine removal rate are recorded. The whole process of oil injection and brine removal is recorded by a high-speed camera; Performing an oil storage test in the sediment gap, when the first acrylic salt chamber, the second acrylic salt chamber, and the sediment particles are filled with the oil to be tested, activating the temperature controller and the heating hole to allow the first acrylic salt chamber and the second acrylic salt chamber to reach a preset ground temperature environment; The brine reservoir is connected to the first oil reservoir and the second oil reservoir respectively to conduct a brine injection oil recovery experiment in the sediment gap, record the oil recovery rate and brine injection rate, and record the entire process of brine injection oil recovery with a high-speed camera; filtering the oil collected in the first oil reservoir through a first filter and filtering the oil collected in the second oil reservoir through a second filter to calculate the sediment content and analyze the quality of the collected oil; The recorded test data are analyzed to optimize the sediment void oil storage injection and production operation parameters.

6. The high-impurity salt mine sediment void oil storage and injection and production experimental method according to claim 5, characterized in that: The method further includes: performing an oil injection and brine removal experiment or a brine injection and oil recovery experiment by replacing sediment particles of different particle gradations, brine of different concentrations, and different types of oil products; after the experiment, performing CT and MRI scanning on the sediment particles to analyze the deterioration ability of the sediment particles.

7. A method for optimizing operating parameters of void oil storage and injection production in high-impurity salt mine sediments, characterized in that: The method comprises: The salt mine slag void oil storage and injection and production operation parameter optimization device according to claim 4 is installed, and the sealing of the device is ensured; The particle size distribution of sediment particles was determined by interlayer collapse test and water solubility test; Optimizing and analyzing the injection and production operation parameters by using the salt mine slag void oil storage injection and production operation parameter experimental method and the control variable method described in claim 6; On the basis of ensuring the oil recovery capacity of the sediment voids, the injection and recovery rate of the target oil product and the displacement fluid are adjusted, and different types of oil products and displacement fluids of different concentrations are replaced. The physical and chemical properties of the oil products produced from the sediment voids are analyzed to determine the optimal storage oil product, displacement fluid type and injection and recovery rate; According to the type of oil, its saturated vapor pressure and the clogging of sediment voids, different ground temperatures and formation pressures are adjusted to determine the burial depth of different types of oil in salt caverns; Adjusting the number of injection and production operations according to the deterioration properties of the sediment particles and the pressure in the device to determine the injection and production cycle of the sediment void oil storage; According to the amount of oil recovery from sediment voids, the particle size distribution and sediment content of the sediment particles are adjusted; By computer processing the operating parameters and analyzing their correlation, the optimal parameter ranges for sediment content, temperature, injection rate, and pressure during the sediment void storage and injection production operation are determined. The type of stored oil and the type of displacing liquid are also determined. This provides guidance for the actual salt cavern sediment storage and injection production operating parameters, thereby achieving efficient operation of high-impurity salt cavern sediment storage depots.

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