High-impurity salt mine sediment gap oil storage injection-production operation parameter optimization device and method

Abstract

The invention provides a high-impurity salt mine sediment gap oil storage injection and production operation parameter optimization device and method, and the device comprises a transparent heat-insulation 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 and control assembly and a sealing assembly. The whole injection-production operation process of sediment gap oil storage of a single salt cavity and double salt cavities (U-shaped cavities) of a salt mine is simulated, and circulation control over whole-process oil injection and brine discharge and brine injection and oil production under the conditions of different grading sediments, different oil / brine injection rates and pressures and different ground temperatures can be achieved. The oil injection / extraction rate and the brine injection / discharge rate under different injection and extraction conditions and the recovery ratio of sediment gap oil storage are obtained, the microscopic flow condition of oil brine / gas displacement in the sediment gap is obtained, and therefore the oil storage volume and the oil storage capacity of the salt mine sediment gap are determined, and sediment oil storage injection and extraction operation adjusting parameters are established. According to the invention, the injection-production working condition in a real underground salt cavity can be simulated, and the feasibility exploration of sediment gap oil storage whole-process control and gas injection and oil production is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of salt cavern sludge interstitial oil storage, and in particular relates to a device and method for optimizing injection and production operation parameters of high-impurity salt mine sludge interstitial oil storage. Background Art

[0002] Underground salt caverns are internationally recognized as excellent places for underground energy storage, and are also excellent underground storage spaces for strategic and commercial oil reserves. Underground salt cavern oil storage has been widely used in the United States, France, Germany and other countries. At present, the field application of underground salt cavern oil storage has not yet been carried out in China.

[0003] There are great differences between domestic salt rock formations and foreign salt rock formations. The characteristics of many interlayers, thick interlayers, many insoluble impurities in the salt layer, and thin salt layers lead to the generation of a large number of insoluble sediment particles during the salt cavern formation 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 inside, which can occupy more than 40% of the sediment accumulation body. Therefore, using sediment voids to store oil is an excellent method to increase underground salt cavern oil reserves with high impurities. Monitoring the parameters (oil injection rate, oil production rate, brine injection rate, brine drainage rate, oil loss rate, oil recovery rate, sediment voids) during the operation of sediment void oil storage is of great value to the application of salt cavern sediment void oil storage, and a set of sediment storage experimental equipment that can dynamically monitor the entire process is urgently needed. At present, there are few experimental devices for regulating sediment void injection and production parameters in China.

[0004] It can be seen that how to provide a device for optimizing the injection and production operation parameters of high-impurity salt mine sediment void storage oil to simulate the injection and production operation process of salt cavern sediment oil storage, analyze the feasibility of different sediment void storage oil, and thus provide an experimental basis for the development of large-scale underground salt cavern sediment void storage oil is a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] The object of the present invention is to provide a device and method for optimizing the operating parameters of void oil storage and injection production in high-impurity salt mine sediments, so as to solve at least one of the above-mentioned technical problems.

[0006] To achieve the above-mentioned objectives, the first aspect of the present invention provides a device for optimizing the parameters of injection and production operations of a high-impurity salt mine sludge void storage oil, 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 containing sludge particles; a first injection and production oil component, the first 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 containing sludge particles; a second injection and production oil component, the second injection and production oil component being connected to the top of the second acrylic salt chamber; an injection and production brine component, the injection and production brine component being connected to the bottom of the first acrylic salt chamber, and the injection and production brine component being connected to the bottom of the second acrylic salt chamber; a high-speed camera, the high-speed camera being arranged on the outside of the transparent heat-insulating and pressure-resistant safety box for recording the entire process of injection and production operations of the sludge void storage oil.

[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 arranged on the first oil pipe, a first cooling component is arranged 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 arranged 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 arranged on the second oil pipe, a second cooling assembly is arranged 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 arranged 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 brine injection and production assembly 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, the brine reservoir is connected to the intermediate brine injection and discharge pipe and is provided outside the transparent heat-insulating and pressure-resistant safety box, and a third temperature detector is provided in the brine reservoir; a brine weigher, Used to weigh the weight of brine in the brine reservoir; a brine pressure regulator, connected to the brine reservoir, for adjusting the injection pressure of brine in the brine reservoir; a brine injection and discharge rate collector, connected to the brine weigher, for recording the injection and production rate of brine in the brine reservoir; wherein 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.

[0010] In the first aspect, the device also includes: a first air compression component, which is connected to the first acrylic salt chamber through a first main pipe and is used to inject air into the first acrylic salt chamber; a first oil regulating valve is provided on the first main pipe, and a first cavity pressure gauge is provided between the first oil regulating valve and the first acrylic salt chamber; a second air compression component, which is connected to the second acrylic salt chamber through a second main pipe and is used to inject air into the second acrylic salt chamber; a second oil regulating valve is provided on the second main pipe, and a second cavity pressure gauge is provided between the second oil regulating valve and the second acrylic salt chamber; a temperature control component, which is used to adjust the temperature of the first acrylic salt chamber and the second acrylic salt chamber to simulate the actual underground salt chamber temperature; a sealing component, which is used to seal the first acrylic salt chamber and the second acrylic salt chamber.

[0011] In the first aspect, the first air compression component includes: a first air compressor, a first air pipe and a first air compression valve, 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 component includes: a second air compressor, a second air pipe and a second air compression valve, 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.

[0012] In the first aspect, the temperature control component includes: a first temperature sensor, which is arranged on the inner wall of the first acrylic salt chamber; a second temperature sensor, which is arranged on the inner wall of the second acrylic salt chamber; a heating hole, which is arranged at the top of the interior of the transparent heat-insulating and pressure-resistant safety box; and a temperature controller, which 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.

[0013] The second aspect of the present invention provides a method for optimizing the operating parameters of oil injection and production in the voids of high-impurity salt mine sediments. The experimental method comprises: connecting the operating parameter optimization device of the voids of salt mine sediments oil injection and production according to the first aspect, and checking the sealing of the experimental device; when the sealing of the experimental device is intact, placing sediment particles into the first acrylic salt chamber and the second acrylic salt chamber respectively, adding the oil to be tested into the first oil reservoir and the second oil reservoir respectively, and adding brine into the brine reservoir to complete the preparation work before the experiment; testing the porosity of the sediment particles; filling the first acrylic salt chamber and the second acrylic salt chamber with brine, and starting the temperature controller and the heating hole so that the first acrylic salt chamber and the second acrylic salt chamber reach a preset geothermal environment to simulate the initial state of the salt chamber; connecting the first oil reservoir and the second oil reservoir to the brine reservoir respectively to perform oil injection and brine removal experiments in the sediment voids. The invention relates to a method for conducting an oil storage test in the sediment voids, recording the oil injection rate and the brine discharge rate, and recording the whole process of oil injection and brine discharge by a high-speed camera; conducting an oil storage test in the sediment voids, and when the first acrylic salt chamber, the second acrylic salt chamber and the sediment particles are filled with the oil to be tested, starting the temperature controller and the heating hole, so that the first acrylic salt chamber and the second acrylic salt chamber reach a preset geothermal environment; connecting the brine reservoir to the first oil reservoir and the second oil reservoir, respectively, to conduct a brine injection and oil production experiment in the sediment voids, recording the oil production rate and the brine injection rate, and recording the whole process of brine injection and oil production by a high-speed camera; filtering the oil collected in the first oil reservoir by a first filter, and filtering the oil collected in the second oil reservoir by a second filter, so as to calculate the sediment content, and analyze the quality of the collected oil; analyzing the recorded test data, so as to optimize the sediment voids oil storage and injection operation parameters.

[0014] In the second aspect, the experimental method also includes: replacing sediment particles with different particle gradings, brine with different concentrations and different types of oil products to conduct oil injection and brine removal experiments or brine injection and oil production experiments. After the experiment, the sediment particles are subjected to CT and MRI scanning to analyze the deterioration ability of the sediment particles.

[0015] The third aspect of the present invention provides a method for optimizing the injection and production operation parameters of a void storage oil storage in a high-impurity salt mine sludge, the method comprising: installing the salt mine sludge void storage oil injection and production operation parameter optimization device according to the first aspect, and ensuring the sealing of the device; determining the particle grading of the sludge particles through interlayer collapse experiments and water solubility experiments; optimizing and analyzing the injection and production operation parameters through the salt mine sludge void storage oil injection and production operation parameter experimental method and the control variable method described in the second aspect; on the basis of ensuring the oil production capacity of the sludge void, adjusting the injection and production rate of the target oil product and the displacement liquid, and replacing different types of oil products and different concentrations of displacement liquids, and analyzing the physical and chemical performance indicators of the oil produced from the sludge void, so as to determine the optimal storage oil product, displacement liquid type and injection and production rate rate; according to the type of oil, its saturated vapor pressure and the clogging of sediment voids, different ground temperatures and different formation pressures are adjusted to determine the burial depth of different types of oil in the salt caverns; according to the degradation performance of sediment particles and the pressure in the device, the number of injection and production operations is adjusted to determine the injection and production cycle of sediment void oil storage; according to the amount of sediment void oil production, the particle grading of sediment particles and sediment content are adjusted; by computer processing operation parameters and analyzing the correlation of operation parameters, the optimal parameter range of sediment content, temperature, injection and production rate and pressure during the sediment void oil storage injection and production operation process is determined, the type of stored oil and the type of displacement liquid are determined, and guidance is provided for the actual salt cavern sediment storage injection and production operation parameters, so as to realize the efficient operation of high-impurity salt cavern sediment oil storage depot.

[0016] Beneficial effects:

[0017] The present invention provides a high-impurity salt mine sediment void storage oil injection and production operation parameter optimization device, comprising: a transparent heat-insulating pressure-resistant safety box, a first acrylic salt chamber, a first oil injection and production component, a second acrylic salt chamber, a second oil injection and production component, a brine injection and production component and a high-speed camera, the first acrylic salt chamber is arranged on one side of the transparent heat-insulating pressure-resistant safety box, the second acrylic salt chamber is arranged on the other side of the transparent heat-insulating pressure-resistant safety box, the first acrylic salt chamber and the second acrylic salt chamber are both used to hold sediment particles to simulate the salt chamber of the salt mine; the first oil injection and production component and the top of the first acrylic salt chamber are connected to each other. The first acrylic salt chamber is connected to the second acrylic salt chamber, and the second oil injection and production assembly is connected to the top of the second acrylic salt chamber to inject the oil to be tested into the first acrylic salt chamber and the second acrylic salt chamber for storage or to displace the original brine in the salt chamber; 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, which is used to inject brine into the first acrylic salt chamber and the second acrylic salt chamber, and the whole process of sediment void storage oil injection and production operation is recorded in combination with a high-speed camera to obtain the porosity of the sediment particles in the salt chamber, and then the feasibility of sediment void storage of oil can be analyzed. The experimental device provided by the present invention can be used to simulate the whole process of injection and production of salt cave sediment void storage of oil, by replacing sediment particles with different particle gradings and different oil products, and observing the oil-brine displacement phenomenon in the first acrylic salt chamber or the second acrylic salt chamber through a transparent heat-insulating and pressure-resistant safety box, so as to analyze the feasibility of sediment void storage of oil with different particle gradings and different types of oil. The present invention can simulate the injection and production operation conditions under the conditions of brine pressure, crude oil, finished oil pressure and geothermal temperature of a real underground salt cavity, can analyze the feasibility and oil storage capacity of storing crude oil and finished oil in sediment voids, establish optimization and adjustment of operation condition parameters (oil injection rate, oil production rate, brine injection rate, brine discharge rate, oil loss rate, oil recovery rate, sediment void ratio) of real underground salt cavity sediment oil storage, and can verify the feasibility of using air for oil displacement, can carry out sediment void oil storage experiments in single-cavity and double-cavity (U-shaped cavity) salt mines, and provide good indoor experimental conditions for the development of large-scale underground salt cave sediment void oil storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of the device for optimizing the operation parameters of the void oil storage and injection production of high-impurity salt mine sediment in the present invention;

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

[0021] Figure 3 This is a graph showing the relationship between the brine removal rate and time during the oil injection brine removal experiment in the present invention;

[0022] Figure 4 This is a graph showing the relationship between the oil injection rate and time during the oil injection and brine removal experiment in the present invention;

[0023] Figure 5 It is a flow chart of the method for optimizing the operating parameters of the void oil storage and injection production of high-impurity salt mine sediment in the present invention;

[0024] Reference numerals:

[0025] 1. Transparent heat-insulating and pressure-resistant safety box;

[0026] 2. First acrylic salt chamber; 201. First main pipe; 202. First oil product regulating valve; 203. First chamber pressure gauge;

[0027] 3. First injection and production assembly; 301. First oil reservoir; 302. First oil pipe; 303. First injection valve; 304. First flow meter; 305. First oil injection pressure regulator; 306. First oil weigher; 307. First injection and production rate collector;

[0028] 4. Second acrylic salt chamber; 401. Second main pipe; 402. Second oil product regulating valve; 403. Second chamber pressure gauge;

[0029] 5. Second injection and production assembly; 501. Second oil reservoir; 502. Second oil pipe; 503. Second injection valve; 504. Second flow meter; 505. Second oil injection pressure regulator; 506. Second oil weigher; 507. Second injection and production rate collector;

[0030] 6. Brine injection and production assembly; 601. Intermediate brine injection and discharge pipe; 602. First water pipe; 603. Second water pipe; 604. First stop valve; 605. Second stop valve; 606. Brine storage; 607. Brine weigher; 608. Brine pressure regulator; 609. Brine injection and discharge rate collector; 610. Brine injection and discharge valve; 611. Brine pressure gauge; 612. Brine injection and production valve;

[0031] 7. First air compression assembly; 701. First air compressor; 702. First air pipe; 703. First air compression valve;

[0032] 8. Second air compression assembly; 801. Second air compressor; 802. Second air pipe; 803. Second air compression valve;

[0033] 9. Temperature control component; 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 bracket;

[0036] 12. Sediment particles. DETAILED DESCRIPTION

[0037] The technical scheme of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0038] Meanwhile, in the embodiments of this specification, when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time.

[0039] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0040] Embodiment 1:

[0041] See also Figure 1The present invention provides a device for optimizing the parameters of injection and production operation of oil in a high-impurity salt mine sludge void storage, the device comprising: a transparent heat-insulating and pressure-resistant safety box 1, a first acrylic salt chamber 2, the first acrylic salt chamber 2 being arranged on one side of the interior of the transparent heat-insulating and pressure-resistant safety box 1, for containing sludge particles 12; a first injection and production oil component 3, the first injection and production component being connected to the top of the first acrylic salt chamber 2; a second acrylic salt chamber 4, the second acrylic salt chamber 4 being arranged on the other side of the interior of the transparent heat-insulating and pressure-resistant safety box 1, for containing sludge particles 12; a second injection and production oil component 5, the second injection and production oil component 5 being connected to the top of the second acrylic salt chamber 4; an injection and production brine component 6, the injection and production brine component 6 being connected to the bottom of the first acrylic salt chamber 2, and the injection and production brine component 6 being connected to the bottom of the second acrylic salt chamber 4; a high-speed camera, the high-speed camera being arranged on the outside of the transparent heat-insulating and pressure-resistant safety box, for recording the entire process of injection and production operation of oil in a sludge void storage.

[0042] Specifically, the high-impurity salt mine sediment void storage oil injection and production operation parameter optimization device provided by the present invention comprises: a transparent heat-insulating and pressure-resistant safety box 1, a first acrylic salt chamber 2, a first oil injection and production component 3, a second acrylic salt chamber 4, a second oil injection and production component 5, a brine injection and production component 6 and a high-speed camera, the first acrylic salt chamber 2 is arranged on one side of the transparent heat-insulating and pressure-resistant safety box 1, the second acrylic salt chamber 4 is arranged on the other side of the transparent heat-insulating and pressure-resistant safety box 1, the first acrylic salt chamber 2 and the second acrylic salt chamber 4 are both used to hold sediment particles 12 to simulate the salt chamber of the salt mine; the first oil injection and production component 3 and the first acrylic salt chamber 4 are connected to each other. The top of the salt chamber 2 is connected, and the second oil injection and production component 5 is connected to the top of the second acrylic salt chamber 4, so as to inject the oil to be tested into the first acrylic salt chamber 2 and the second acrylic salt chamber 4 for storage or to displace the original brine in the salt chamber; the brine injection and production component 6 is connected to the bottom of the first acrylic salt chamber 2, and the brine injection and production component 6 is connected to the bottom of the second acrylic salt chamber 4, which is used to inject brine into the first acrylic salt chamber 2 and the second acrylic salt chamber 4, and combine with a high-speed camera to record the entire process of sediment void oil storage injection and production operation, obtain the porosity of the sediment particles 12 in the salt chamber, and then analyze the feasibility of sediment void oil storage. The experimental device provided by the present invention can be used to simulate the injection and production operation process of salt cavern sediment oil storage. By replacing sediment particles 12 with different particle gradings and observing the oil-brine displacement phenomenon in the first acrylic salt cavity 2 or the second acrylic salt cavity 4 through the transparent heat-insulating and pressure-resistant safety box 1, the feasibility of different sediment interstitial oil storage is analyzed, providing an experimental basis for the development of large-scale underground salt cavern sediment interstitial oil storage.

[0043] In some possible embodiments, the first oil injection and production component 3 includes: a first oil reservoir 301, the first oil reservoir 301 is connected to the top of the first acrylic salt chamber 2 through a first oil pipe 302, and a first oil injection valve 303 and a first flowmeter 304 are arranged on the first oil pipe 302, a first cooling component is arranged at the interface between the first oil pipe 302 and the first acrylic salt chamber 2, and a first temperature detector and a first saturated vapor pressure detector are arranged in the first oil reservoir 301; a first oil injection pressure regulator 305, connected to the first oil reservoir 301, for adjusting the injection pressure of the oil in the first oil reservoir 301; a first oil weigher 306, for weighing the weight of the oil in the first oil reservoir 301; a first oil injection and production rate collector 307, connected to the first oil weigher 306, for recording the injection and production rate of the oil in the first oil reservoir 301; a first filter, for filtering the oil in the first oil reservoir.

[0044] Those skilled in the art can understand that the first oil injection and production assembly 3 includes a first oil reservoir 301, a first oil injection pressure regulator 305, a first oil weigher 306 and a first oil injection and production rate collector 307. The first oil reservoir 301 is used to store the oil to be tested, and the oil to be tested is input into the first acrylic salt chamber 2 through the first oil pipe 302, and a first oil injection valve 303 and a first flow meter 304 are set on the first oil pipe 302 to observe the oil injection rate. Furthermore, a first cooling assembly is set at the interface of the first oil pipe 302 and the first acrylic salt chamber 2 to cool the oil extracted from the first acrylic salt chamber 2 so that it enters the first oil reservoir 301 for storage, and a first temperature control valve 303 and a first flow meter 304 are set in the first oil reservoir 301. A temperature detector and a first saturated vapor pressure detector are used to monitor the produced oil after cooling and obtain the cooling efficiency of the oil after production at different temperatures. At the same time, the produced oil is filtered by the first filter to analyze the quality of the produced oil and the degree of crushing of the slag particles, and then the injection and production operation parameters are determined. In addition, the first oil injection pressure control is connected to 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 is convenient for carrying out sediment void oil storage injection and production experiments under different formation pressures. At the same time, the first oil weigher 306 is used to weigh the quality of the oil in the first oil reservoir 301 during the experiment, and the first injection and production rate collector 307 is combined to record the experimental data during the experiment.

[0045] In some possible embodiments, the second oil injection and production component 5 includes: a second oil reservoir 501, which is connected to the top of the second acrylic salt chamber 4 through a second oil pipe 502, and a second oil injection valve 503 and a second flow meter 504 are arranged on the second oil pipe 502, a second cooling component is arranged at the interface between the second oil pipe 502 and the second acrylic salt chamber 4, and a second temperature detector and a second saturated vapor pressure detector are arranged in the second oil reservoir 501; a second oil injection pressure regulator 505, which is connected to the second oil reservoir 501 and is used to adjust the injection pressure of the oil in the second oil reservoir 501; a second oil weigher 506, which is used to weigh the weight of the oil in the second oil reservoir 501; a second oil injection and production rate collector 507, which is connected to the second oil weigher 506 and is used to record the injection and production rate of the oil in the second oil reservoir 501; and a second filter, which is used to filter the oil in the second oil reservoir.

[0046] In order to simulate the oil injection and production of the double salt chamber sediment void storage, the present invention further provides a second oil injection and production component 5, through which oil is injected into the second acrylic salt chamber 4. The setting method of the second oil injection and production component 5 is the same as the setting method of the first oil injection and production component 3. The oil extracted from the second acrylic salt chamber 4 is cooled by the second cooling component, and is stored in the second oil reservoir 501. A second temperature detector and a second saturated vapor pressure detector are provided in the second oil reservoir 501 to monitor the oil extracted after cooling, obtain the cooling efficiency of the oil after extraction at different temperatures, and use the second filter to filter the extracted oil to analyze the quality of the extracted oil and the degree of crushing of the sediment particles, and then optimize the injection and production operation parameters. In a specific embodiment, the oil storage capacity of the sediment voids in the double salt chambers 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, as well as the detection data of the oil products in the first acrylic salt chamber 2 and the second acrylic salt chamber 4, and the relationship between the quality of the oil products stored in the salt chambers at different temperatures and the quality of the oil products after production and the entire injection and production operation process is analyzed, thereby establishing safe and efficient sediment void oil storage and injection and production operation parameters.

[0047] In addition, during the oil production process, the effect of ground temperature will change the saturated vapor pressure of the oil. By setting a cooling component at the oil outlet of the salt cavity and a temperature detector and a saturated vapor pressure detector in the oil reservoir, the temperature change, vapor pressure change and cooling efficiency of the produced oil can be analyzed, and then the optimal injection and production rate of different oils at different temperatures can be obtained, and the influence of ground temperature, oil properties and injection and production rate on the produced oil can be analyzed. The saturated vapor pressure of different oils is analyzed to prevent them from producing a lot of gas and maintain the safety of transportation, thereby determining the best type of sediment storage oil and the depth of the salt cavern.

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

[0049] Those skilled in the art can understand that the brine injection and production assembly 6 includes an intermediate brine injection and discharge pipe 601, a brine storage tank 606, a brine weigher 607, a brine pressure regulator 608 and a brine injection and discharge rate collector 609. The intermediate brine injection and discharge pipe 601 is connected to the bottom of the first acrylic salt cavity 2 through a first water pipe 602, and the intermediate brine injection and discharge pipe 601 is connected to 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 are converged at one end of the intermediate brine injection and discharge pipe 601, so that the brine storage tank 606 can simultaneously inject brine into the first acrylic salt cavity 2 and the second acrylic salt cavity 4. Furthermore, a first stop valve 604 is provided on the first water pipe 602, and a second stop valve 605 is provided 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 brine injection and discharge pipe 601 is connected to the brine storage tank 606. The brine reservoir 606 is connected, and a brine injection and discharge valve 610 is arranged near the brine reservoir 606. The brine reservoir 606 is arranged outside the transparent heat-insulating and pressure-resistant safety box 1, which is convenient for adding brine into the brine reservoir 606 or collecting brine; the brine pressure regulator 608 is connected to the brine reservoir 606 to adjust the pressure of brine injected into the salt cavity, and the brine weigher 607 is used to weigh the weight of the brine, so that the porosity of the sediment particles 12 in the salt cavity can be calculated, and the experimental data during the experiment can be recorded in combination with the brine injection and discharge rate collector 609; in addition, a brine injection and discharge valve 610, a brine pressure gauge 611 and a brine injection and production valve 612 are sequentially arranged in the direction away from the brine reservoir 606 on the intermediate brine injection and discharge pipe 601. By arranging the brine pressure gauge 611 between the brine injection and discharge valve 610 and the brine injection and production valve 612, the pressure in the intermediate brine injection and discharge pipe 601 during the oil injection and brine discharge or brine injection and production experiment can be intuitively understood.

[0050] It should be noted that the liquid stored in the brine storage tank 606 can be brine or fresh water of different concentrations. The oil in the salt cavity can be displaced by replacing different displacement liquids. Combined with the detection data during the oil injection and brine removal and brine injection and oil production experiments, the operation status of sediment particles and the recovery rate of oil products, the entire sediment void storage and injection and production operation process is analyzed to determine the optimal displacement liquid, oil type and injection and production rate, providing an indoor experimental basis for large-scale underground salt cavern sediment void oil storage.

[0051] In addition, the present application can also change the temperature and the rate of displacement liquid, analyze the sediment void oil recovery capacity (oil production and oil recovery rate) at different temperatures and different displacement liquid rates, and determine the optimal displacement liquid type and displacement temperature. The displacement temperature can be achieved through the salt layer burial depth of the on-site project.

[0052] In some possible embodiments, the device further includes: a first air compression component 7, which is connected to the first acrylic salt chamber 2 through a first main pipe 201 and is used to inject air into the first acrylic salt chamber 2; a first oil product regulating valve 202 is provided on the first main pipe 201, and a first cavity pressure gauge 203 is provided between the first oil product regulating valve 202 and the first acrylic salt chamber 2; a second air compression component 8, which is connected to the second acrylic salt chamber 4 through a second main pipe 401 and is used to inject air into the second acrylic salt chamber 4; a second oil product regulating valve 402 is provided on the second main pipe 401, and a second cavity pressure gauge 403 is provided between the second oil product regulating valve 402 and the second acrylic salt chamber 4; a temperature control component 9, which is used to adjust the temperature of the first acrylic salt chamber 2 and the second acrylic salt chamber 4 to simulate the real underground salt chamber temperature; a sealing component 10, which is used to seal the first acrylic salt chamber 2 and the second acrylic salt chamber 4.

[0053] The device provided by the present invention also includes a first air compression component 7, a second air compression component 8, a temperature control component 9 and a sealing component 10. The first air compression component 7 is connected to the first acrylic salt chamber 2 through a first main pipe 201, and is used to inject air into the first acrylic salt chamber 2 to discharge the brine or oil in the sediment particles 12, and a first oil product regulating valve 202 is arranged on the first main pipe 201, and a first cavity pressure gauge 203 is arranged at the top of the first acrylic salt chamber 2 to accurately display the actual pressure in the first acrylic salt chamber 2; based on the same principle, the second air compression component 8 is connected to the second acrylic salt chamber 4 through a second main pipe 401, and is used to inject air into the second acrylic salt chamber 4 to discharge the brine or oil in the sediment particles 12, and A second oil regulating valve 402 is provided on the second main pipe 401, and a second cavity pressure gauge 403 is provided between the second oil regulating valve 402 and the second acrylic salt cavity 4 to accurately display the actual pressure in the second acrylic salt cavity 4. At the same time, the pressure in the salt cavity is adjusted in combination with the first oil injection pressure regulator 305 and the second oil injection pressure regulator 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 component 9 to simulate the actual underground salt cavity temperature, and then the temperature and pressure of the underground salt cavity are realistically simulated, so as to realistically simulate the injection and production of salt mine sludge interstitial storage oil, establish sludge oil storage operation parameters, and provide experimental basis for the development of actual underground salt cavern sludge interstitial storage oil.

[0054] In some possible embodiments, the first air compression component 7 includes: a first air compressor 701, a first air pipe 702 and a first air compression valve 703, and the first air compression valve 703 is arranged on the first air pipe 702; one end of the first air pipe 702 is connected to the first air compressor 701, and the other end of the first air pipe 702 is connected to the first main pipe 201; the second air compression component 8 includes: a second air compressor, a second air pipe 802 and a second air compression valve 803, and the second air compression valve 803 is arranged on the second air pipe 802; one end of the second air pipe 802 is connected to the second air compressor, and the other end of the second air pipe 802 is connected to the second main pipe 401.

[0055] In some possible embodiments, the temperature control component 9 includes: a first temperature sensor 901, which is arranged on the inner wall of the first acrylic salt chamber 2; a second temperature sensor 902, which is arranged on the inner wall of the second acrylic salt chamber 4; a heating hole 903, which is arranged at the top of the interior of the transparent heat-insulating and pressure-resistant safety box 1; a temperature controller 904, which is connected to the first temperature sensor 901, the temperature controller 904 is connected to the second temperature sensor 902, and the temperature controller 904 is connected to the heating hole 903.

[0056] Those skilled in the art can understand that the temperature control and regulation component includes a first temperature sensor 901, a second temperature sensor 902, a heating hole 903 and a temperature controller 904, and the first temperature sensor 901, the second temperature sensor 902, and the heating hole 903 are all connected to the temperature controller 904, and the first temperature sensor 901 is set on the inner wall of the first acrylic salt chamber 2 to accurately sense the temperature in the first acrylic salt chamber 2. Similarly, the second temperature sensor 902 is set on the inner wall of the second acrylic salt chamber 4 to sense the temperature in the second acrylic salt chamber 4, and the temperature controller 904 controls the heating hole 903 to heat the transparent heat-insulating and pressure-resistant safety box 1 to adjust the temperature of the first acrylic salt chamber 2 and the second acrylic salt chamber 4 to meet the geothermal environment, thereby carrying out sediment void oil storage experiments.

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

[0058] In addition, the device of the present invention further comprises a bottom bracket 11, which is arranged at the bottom end of the transparent heat-insulating and pressure-resistant safety box 1 and abuts against the outer walls of the first acrylic salt chamber 2 and the second acrylic salt chamber 4 to fix the first acrylic salt chamber 2 and the second acrylic salt chamber 4.

[0059] In summary, the first acrylic salt chamber 2 and the second acrylic salt chamber 4 together constitute the salt chamber simulation system of the present invention, which is used to contain sediment particles and simulate ground temperature and formation pressure; the first oil injection and production component 3 and the second oil injection and production component 5 constitute the oil injection and production monitoring system of the present invention, the brine injection and production component 6 constitutes the brine injection and discharge monitoring system of the present invention, and the first air compression component 7 and the second air compression component 8 constitute the air displacement system of the present invention, so as to simulate the injection and production conditions in the real underground salt chamber, and monitor the flow rate, pressure, temperature, oil quality and saturated vapor pressure, and deterioration ability of sediment particles during the injection and production process, and process the above monitoring data by computer to determine the relationship between the oil storage and injection and production capacity of sediment particles with different particle gradings under different oil injection pressures, different temperatures, and different injection and production rates. The device for optimizing injection and production operation parameters of sediment void oil storage in high-impurity salt mines provided by the present invention can simulate the injection and production operation process of sediment void oil storage in single salt cavity and double salt cavity (U-shaped cavity) of salt mines, and obtain the oil production rate and brine discharge rate under different injection and production conditions by measuring the amount of brine that can be discharged from the sediment voids at different oil injection pressures and temperatures of sediment particles 12 with different particle gradings, and measuring the oil production under different brine injection pressures, and observing the phenomenon of oil and brine displacement in the voids of sediment particles 12, thereby determining the feasibility of sediment void oil storage, establishing sediment oil storage operation parameters, and providing an experimental basis for the development of sediment void oil storage in underground salt caverns.

[0060] Embodiment 2

[0061] See also Figure 2The present invention provides a method for operating an experimental system for storing oil in a void space of a high-impurity salt mine sludge, the method comprising:

[0062] Connect the salt mine slag interstitial oil storage injection and production operation parameter optimization device according to the first aspect, and check the sealing of the experimental device;

[0063] When the sealing of the device is intact, sediment particles 12 are placed in the first acrylic salt chamber 2 and the second acrylic salt chamber 4, respectively, the oil to be tested is added to the first oil reservoir 301 and the second oil reservoir 501, respectively, and brine is added to the brine reservoir 606 to complete the preparation work before the experiment;

[0064] Testing the porosity of the sediment particles 12;

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

[0066] The first oil reservoir 301 and the second oil reservoir 501 are connected to the brine storage 606 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, and the whole process of oil injection and brine removal is recorded by a high-speed camera;

[0067] Performing an oil storage test of the sediment gap, when the first acrylic salt chamber 2, the second acrylic salt chamber 4 and the sediment particles 12 are filled with the oil to be tested, starting the temperature controller 904 and the heating hole 903, so that the first acrylic salt chamber 2 and the second acrylic salt chamber 4 reach a preset ground temperature environment;

[0068] The brine storage 606 is connected to the first oil storage 301 and the second oil storage 501 respectively to carry out a brine injection oil recovery experiment in the sediment gap, record the oil recovery rate and the brine injection rate, and record the whole process of brine injection oil recovery through a high-speed camera;

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

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

[0071] The method further comprises: replacing sediment particles with different particle gradations, brine with different concentrations and different types of oil products to conduct an oil injection and brine removal experiment or a brine injection and oil production experiment; after the experiment, performing CT and nuclear magnetic resonance scanning on the sediment particles to analyze the deterioration ability of the sediment particles.

[0072] Specifically, the present invention provides an experimental method for the oil injection and production operation of the voids of high-impurity salt mine sediment. Taking the oil injection and production and brine injection and drainage experiment of the voids of double salt chamber salt cavern sediment as an example, first, the experimental device in Example 1 is installed and connected, and the brine pressure regulating device is opened to fill the first acrylic salt chamber 2 and the second acrylic salt chamber 4 with brine, and observe whether there is leakage at the connection points of each pipeline in the experimental device. If there is leakage, it is repaired in time to ensure the sealing of the experimental device; secondly, when the sealing of the experimental device is intact, the first pressure regulating bolt 1002 and the first pressure regulating bolt 1002 are opened, and sediment particles 12 are placed in the first acrylic salt chamber 2 and the second acrylic salt chamber 4 respectively, and the volume share of the sediment particles 12 is determined by the actual simulation. The comprehensive solubility rate of the salt layer in the cavity is estimated. After the sediment particles 12 are placed, the first pressure regulating bolt 1002 and the second pressure regulating bolt 1004 are tightened, and the oil to be tested is added to the first oil reservoir 301 and the second oil reservoir 501 respectively, and brine is added to the brine reservoir 606 to complete the preparation work before the experiment; then, the porosity of the sediment particles 12 is tested, that is, the volume of brine that can be discharged by the sediment particles 12, the first oil injection valve 303 and the second oil injection valve 503 are closed, and the first air compression valve 703, the first oil product regulating valve 202, the second air compression valve 803, the second oil product regulating valve 402, the brine injection and production valve 612, the brine injection and discharge valve 610, the first stop valve 604 and The second stop valve 605 is used to form two passages: brine reservoir 606 → intermediate brine injection and discharge pipe 601 → first water pipe 602 → first acrylic salt chamber 2 → first main pipe 201 → first air pipe 702 → first air compressor 701 and brine reservoir 606 → intermediate brine injection and discharge pipe 601 → second water pipe 603 → second acrylic salt chamber 4 → second main pipe 401 → second air pipe 802 → second air compressor, and the brine pressure regulator 608 and the brine weigher 607 are started to transport brine to the first acrylic salt chamber 2 and the second acrylic salt chamber 4 respectively. After the brine fills the first water pipe 602 and the first water pipe 602 respectively, before entering the bottom sediment particles 12 of the first acrylic salt chamber 2 and the second acrylic salt chamber 4, The mass of brine at this time is recorded as m0. Since the voids of the sediment particles 12 will absorb part of the brine, the brine interface will not be immediately flush with the interface of the sediment particles 12. Therefore, brine is input until the brine interface in the first acrylic salt chamber 2 and the second acrylic salt chamber 4 is in equilibrium with the interface of the sediment particles 12. The mass of brine at this time is recorded as m1 and the height of the brine interface is h. The height of the brine interface is the height h of the sediment particles 12, which is estimated by the comprehensive solubility of the cavity salt layer. Assuming that the comprehensive solubility of the cavity salt layer is c, the volume of the acrylic salt chamber is V1, and the expansion coefficient of the sediment particles is k, the volume of the sediment particles 12 is V2 = V1 × (1-c) × k, and the height of the sediment particles 12 is h = V2 / πr 2, where r is the radius of the acrylic salt cavity; then, start the first air compressor 701 and the second air compressor to inject gas into the first acrylic salt cavity 2 and the second acrylic salt cavity 4 respectively to displace the brine in the gaps of the sediment particles 12, and 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 brine volume V3 of the sediment particles 12 that can be drained is m2 / ρ, and the porosity of the sediment particles 12 is w=m2 / ρ×πr 2 h, where ρ is the density of the brine; finally, the first air compressor 701 and the second air compressor are turned off, and brine is continuously transported to the first acrylic salt chamber 2 and the second acrylic salt chamber 4 until the salt chamber is full, so as to simulate the initial state of the salt chamber, start the temperature controller 904 and the heating hole 903 to simulate the geothermal environment at different depths, adjust the temperature in the salt chamber by the temperature controller, and detect the temperature in the salt chamber in real time by the temperature sensor arranged inside the salt chamber, so as to ensure that the temperature set by the temperature controller 904 can be truly applied to the brine or oil in the salt chamber, thereby improving the accuracy of the experiment;

[0073] Further, on the basis of the above, an experiment of injecting oil and draining brine from the sediment gap was carried out. The first air compression valve 703, the second air compression valve 803, the temperature controller 904 and the heating hole 903 were closed, and the first oil injection valve 303 and the second oil injection valve 503 were opened to form the first oil reservoir 301 → the first oil pipe 302 → the first main pipe 201 → the first acrylic salt chamber 2 → the first water pipe 602 → the middle brine injection and drainage 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 chamber 4 → the second water pipe 603 → the middle The two passages of the brine injection and discharge pipe 601 → brine storage 606 are connected, and the first oil injection and production rate collector 307, the first oil product weighing device 306, the first oil product injection pressure regulator 305, the second oil injection and production rate collector 507, the second oil product weighing device 506, the second oil product injection pressure regulator 505 and the brine injection and discharge rate collector 609 are started, so that the oil to be tested enters the first acrylic salt chamber 2 and the second acrylic salt chamber 4 respectively, and the oil injection rate and the brine discharge rate are recorded to draw a rate change curve; the whole process of oil injection and brine discharge is recorded by a high-speed camera, and a high-speed camera is set The monitoring rate of the machine is consistent with the collection rate of the first oil injection and production rate collector, the second oil 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, the brine injection and discharge valve 610 is closed, and the oil to be tested is continuously injected into the first acrylic salt cavity 2 and the second acrylic salt cavity 4, so that the sediment gaps in the salt cavity are filled with the oil to be tested. When the preset formation pressure is reached in the first acrylic salt cavity 2 and the second acrylic salt cavity 4, the first oil injection pressure control device and the second oil injection pressure control device are stopped, and the first oil control device is closed. Valve 202, the second oil product regulating valve 402 and the brine injection and production valve are used to stop the oil injection and brine removal experiment, wherein different oil products to be tested, such as diesel, gasoline, kerosene and mineral oil, can be used, and different oil injection pressures can be set; after the oil injection and brine removal experiment is completed, the oil storage test of the sediment gap can be carried out, and after the salt cavity and the sediment particles 12 are filled with the oil product to be tested, the temperature controller 904 and the heating hole 903 are started to heat the salt cavity to reach the set ground temperature environment, and the storage time is set to simulate the long-term sediment gap oil storage process under high temperature and high pressure environment, and analyze the feasibility of sediment gap oil storage;

[0074] Further, on the basis of the above, a brine injection and oil discharge experiment was carried out in the sediment gap, the first air compression valve 703 and the second air compression valve 803 were closed, and the brine injection and discharge valve 610 was opened to form a brine reservoir 606 → intermediate brine injection and discharge pipe 601 → first water pipe 602 → first acrylic salt chamber 2 → first main pipe 201 → first oil pipe 302 → first oil reservoir 301 and brine reservoir 606 → intermediate brine injection and discharge pipe 601 → second water pipe 603 → first The two paths are acrylic salt chamber 4 → second main pipe 401 → second oil pipe 502 → second oil reservoir 501. Since the density of the oil to be tested is less than the density of 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 gap between the sediment particles 12 will be displaced by the brine, and the oil to be tested will enter the first oil reservoir 301 and the second oil reservoir 501 respectively to be collected and used, and the oil-brine displacement process is recorded by a high-speed camera. In addition, through the above-mentioned experimental device, multiple rounds of injection and production cycles of the oil to be tested can be carried out, and the porosity and permeability of the sediment particle 12 sample can be measured, so as to analyze the degradation performance of the sediment particle 12 sample, and provide a theoretical basis for the storage of oil in the gap between the sediment in the underground salt cavern.

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

[0076] Alternatively, the first air compression valve 703 and the brine injection and discharge valve 610 are closed, the second air compression valve 803 is opened, and the second air compressor 801 is started to form a passage of 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, 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 gap, and continues to inject air so that the oil in the first acrylic salt chamber 2 and its sediment gap is displaced to the first oil reservoir 301 for collection and utilization, thereby verifying the feasibility of air flooding.

[0077] Furthermore, 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 to calculate the sediment content in the oil and analyze the quality of the produced oil. If the sediment content in the oil is very high, it means that the sediment particles have good fluidity, a high degree of crushing of the sediment particles, and a large number of small particles. It is necessary to optimize the injection and production operation parameters to reduce the sediment content in the produced oil.

[0078] After the process of oil injection and brine removal and brine injection and oil production is completed, the experimental results are analyzed, such as Figure 3-4 As shown, the changes in oil injection rate and brine production rate are analyzed, the changing trends of brine injection rate and oil production rate are analyzed, and the oil recovery rate of sediment oil storage is analyzed. The specific formula is that the mass of injected oil on both sides is m3, and the mass of produced oil is m4, then the oil recovery rate is A = (m4-m3) / m3. The relationship between the changes in oil production rate under different temperatures and different particle gradings is established to provide a basis for the selection of cavity depth and interlayer thickness in actual salt mine sediment oil storage projects.

[0079] Figure 3 It is the process in which the brine in the sediment is gradually displaced by oil during the oil injection and brine removal process. The overall brine removal rate does not fluctuate significantly, with the lowest brine removal rate being 1g / s and the highest brine removal rate being 6g / s. Figure 4 It is the oil injection rate during the oil injection and brine removal process, which also shows a trend of ups and downs, similar to the brine removal rate. This is because oil and brine are immiscible liquid-solid two-phase flows inside the sediment voids, so the rate change trend is the same. Therefore, by determining the change in the oil injection rate, the change in the brine removal rate can be indirectly determined, which has a reference significance for the determination of the rate parameters of oil injection and brine removal in actual projects. Similarly, determining other sediment void injection and production operation parameters is also of reference value for actual engineering applications.

[0080] In addition, the device provided in the present application can be used to carry out oil injection and brine drainage and brine injection and oil production cycle experiments to compare the oil storage capacity of the sediment particles before and after the experiment. After the oil injection and brine drainage and brine injection and oil production cycle experiments are completed, the sediment particles before and after the experiment are compared, and CT and MRI scans are performed on them to further analyze the deterioration ability of the sediment particles and the degree of crushing of the sediment at the bottom of the salt cavity; the pressure difference at both ends is calculated by using the pressure gauges on the top of the salt cavities on both sides and the brine pressure gauge on the middle brine drainage pipe. If the pressure difference is large, the sediment particles at the bottom of the salt cavity will be blocked and the deterioration ability of the sediment particles will be too strong. It is necessary to optimize the injection and production operation parameters to improve the connectivity of the sediment particles and the maximum sediment void oil production.

[0081] By performing CT and MRI scans on the sediment particles, combined with the pressure difference at both ends and the quality control of the produced oil, the injection and production operation parameters can be continuously adjusted until the best produced oil is obtained. The relationship between the best oil-brine injection and production cycle parameters (ensuring that the sediment gaps are not blocked) and the best oil quality (the sediment particles carried are minimal) can be determined, providing a reference basis for actual engineering applications.

[0082] In the above experiments of injecting oil and removing brine from the gaps of salt cavern sediments in double salt cavities, closing the first stop valve 604 or the second stop valve 605 can realize the experiments of injecting oil and removing brine, storing oil and injecting brine to produce oil from the gaps of salt cavern sediments in a single salt cavity.

[0083] In summary, the experimental method for injection and production of oil in high-impurity salt mine sediment voids provided by the present invention can simulate the whole process of injection and production of sediment voids oil storage in a single salt cavity or double salt cavity (U-shaped cavity) of a salt mine, and can realize the whole process of oil injection and brine drainage and brine injection and oil production cycle control under sediment particles of different grading particle distributions, different oil injection / brine rates and pressures, and different geothermal conditions, obtain the oil production rate and brine drainage rate under different injection and production conditions and the recovery rate of sediment voids oil storage, obtain the microscopic flow of oil and brine / gas displacement in the sediment voids, thereby determining the oil storage volume and oil storage capacity of the salt mine sediment voids, and establishing appropriate sediment storage oil injection and production operation adjustment parameters. The present invention can simulate the high temperature and high pressure and injection and production conditions in real underground salt cavities, realize the feasibility study of the whole process control of sediment voids oil storage and gas injection and oil production.

[0084] Embodiment 3

[0085] See also Figure 5 The present invention also provides a method for optimizing operating parameters of void oil storage and production in high-impurity salt mine sediment, the method comprising:

[0086] Install the salt mine slag void oil storage injection and production operation parameter optimization device according to the first aspect, and ensure the sealing of the device;

[0087] The particle size distribution of sediment particles is determined by interlayer collapse test and water dissolution test;

[0088] Optimizing and analyzing the injection and production operation parameters by using the salt mine slag interstitial oil storage injection and production operation parameter experimental method and the control variable method described in the second aspect;

[0089] On the basis of ensuring the oil recovery capacity of the sediment voids, adjust the injection and production rate of the target oil product and the displacement liquid, replace different types of oil products and displacement liquids of different concentrations, and analyze the physical and chemical performance indicators of the oil products produced from the sediment voids to determine the best storage oil product, displacement liquid type and injection and production rate;

[0090] 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;

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

[0092] According to the amount of oil recovery in the sediment voids, the particle size distribution and sediment content of the sediment particles are adjusted;

[0093] By processing the operating parameters by computer and analyzing their correlation, the optimal parameter ranges for sediment content, temperature, injection rate and pressure during the sediment void storage and production operation are determined, the type of stored oil and the type of displacing liquid are determined, and guidance is provided for the actual salt cavern sediment storage and production operating parameters, thereby achieving efficient operation of high-impurity salt cavern sediment oil storage depots.

[0094] Specifically, the sediment void oil storage injection and production operation parameters are optimized through the sediment oil storage experimental device and test method, and the experimental device provided in Example 1 is installed to ensure the sealing of the experimental device; the sediment particle grading is determined through the interlayer collapse experiment and the water solubility experiment; the oil injection and brine removal and brine injection oil production experimental tests are carried out through the control variable method to optimize and analyze the injection and production operation parameters; on the basis of ensuring the sediment void oil production capacity, the injection and production rate of the target oil product and the displacement liquid are adjusted, and different types of oil products and displacement liquids of different concentrations are replaced, and the physical and chemical performance indicators of the oil produced from the sediment void are analyzed to determine the optimal storage oil product, displacement liquid type and injection and production rate, wherein the physical and chemical performance indicators of the oil produced from the sediment void can be tested by instruments such as a viscometer, a moisture content meter, an anti-emulsification performance meter, and a sediment content analyzer, thereby obtaining the viscosity and water content of the oil produced from the sediment void. 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; according to the degradation performance of the sediment and the pressure of the device, the number of injection and production operations is adjusted to determine the injection and production cycle of sediment oil storage; according to the amount of sediment oil production, the particle size distribution and sediment content of the sediment are adjusted, and the above parameters are processed and recorded by computer and the correlation of the parameters is analyzed to determine the optimal parameter range of sediment content, temperature, injection and production rate and pressure during the sediment oil storage operation, determine the type of stored oil and the type of displacement liquid, and continuously carry out injection and production operation parameter optimization tests until the optimal injection and production operation parameters are obtained, so as to provide specific guidance for the injection and production parameters of actual sediment void storage oil on site and realize the efficient operation of high-impurity salt cavern sediment oil storage.

[0095] Since the second and third embodiments are embodiments of the same inventive concept as the first embodiment, and some of their structures are exactly the same, the structures in the second and third embodiments that are substantially the same as those in the first embodiment will not be elaborated in detail. For the parts not described in detail, please refer to the first embodiment.

[0096] Finally, it should be noted that the above embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. They should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

[0097] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A device for optimizing the operation parameters of void oil storage and injection production in high-impurity salt mine sediment, characterized in that: The device comprises: Transparent heat-insulating and pressure-resistant safety box, A first acrylic salt chamber, which is arranged at one side of the interior of the transparent heat-insulating and pressure-resistant safety box and is used to contain sediment particles; a first oil injection and production assembly, wherein the first oil injection and production assembly is connected to the top of the first acrylic salt chamber; A second acrylic salt chamber, which is arranged at 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, wherein the second oil injection and production assembly is connected to the top of the second acrylic salt chamber; A brine injection and production component, wherein the brine injection and production component is connected to the bottom of the first acrylic salt chamber, and the brine injection and production component is connected to the bottom of the second acrylic salt chamber; A high-speed camera is arranged outside the transparent heat-insulating and pressure-resistant safety box and is used to record the whole process of sediment void oil storage injection and production operation.

2. The device for optimizing the operation parameters of high-impurity salt mine sludge interstitial oil storage and injection production according to claim 1 is characterized in that: The first oil injection and production assembly comprises: A first oil reservoir, wherein the first oil reservoir is connected to the top of the first acrylic salt chamber through a first oil pipe, and a first oil filling valve and a first flow meter are arranged on the first oil pipe; a first cooling assembly is arranged at the interface between the first oil pipe and the first acrylic salt chamber; a first temperature detector and a first saturated vapor pressure detector are arranged in the first oil reservoir; a first oil product injection pressure regulator, connected to the first oil reservoir, and used to adjust the injection pressure of the oil product in the first oil reservoir; a first oil product weighing device, used for weighing the weight of the oil product in the first oil reservoir; a first oil injection and production rate collector, connected to the first oil product weigher, and used to record the injection and production rate of the oil product in the first oil reservoir; The first filter is used to filter the oil in the first oil reservoir.

3. The device for optimizing the operation parameters of high-impurity salt mine sludge interstitial oil storage and injection production according to claim 2, characterized in that: The second oil injection and production assembly comprises: A second oil reservoir, wherein the second oil reservoir 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 arranged on the second oil pipe, a second cooling assembly is arranged 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 arranged in the second oil reservoir; a second oil product injection pressure regulator, connected to the second oil reservoir, and used to adjust the injection pressure of the oil product in the second oil reservoir; a second oil product weighing device, used for weighing the weight of the oil product in the second oil reservoir; a second oil injection and production rate collector, connected to the second oil product weigher, and used to record the injection and production rate of the oil product in the second oil reservoir; The second filter is used to filter the oil in the second oil reservoir.

4. The device for optimizing the operation parameters of high-impurity salt mine sludge interstitial oil storage and injection production according to claim 3 is characterized in that: The brine injection and production assembly comprises: An intermediate brine injection and discharge pipe, wherein the intermediate brine injection and discharge pipe is connected to the bottom of the first acrylic salt chamber through a first water pipe, and 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, the brine reservoir is connected to the intermediate brine injection and discharge pipe and is arranged outside the transparent heat-insulating and pressure-resistant safety box, and a third temperature detector is arranged in the brine reservoir; a brine weigher, used for weighing the weight of the brine in the brine storage tank; a brine pressure regulator, connected to the brine reservoir, for regulating the injection pressure of the brine in the brine reservoir; A brine injection and discharge rate collector, connected to the brine weigher, for recording the injection and discharge rate of brine in the brine storage tank; 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.

5. The device for optimizing the operation parameters of high-impurity salt mine sludge interstitial oil storage and injection production according to claim 4, characterized in that: The device also includes: a first air compression assembly, which is connected to the first acrylic salt chamber via a first main pipe and is used to inject air into the first acrylic salt chamber; a first oil product regulating valve is provided on the first main pipe, and a first cavity pressure gauge is provided between the first oil product regulating valve and the first acrylic salt chamber; a second air compression assembly, which is connected to the second acrylic salt chamber via a second main pipe and is used to inject air into the second acrylic salt chamber; a second oil product regulating valve is provided on the second main pipe, and a second cavity pressure gauge is provided between the second oil product regulating 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.

6. The device for optimizing the operation parameters of high-impurity salt mine sludge interstitial oil storage and injection production according to claim 5, characterized in that: The first air compression assembly comprises: 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, wherein 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.

7. The device for optimizing the operation parameters of high-impurity salt mine sludge interstitial oil storage and injection production according to claim 6, characterized in that: The temperature control component comprises: A first temperature sensor, wherein the first temperature sensor is disposed on an inner wall of the first acrylic salt chamber; a second temperature sensor, wherein the second temperature sensor is disposed on an inner wall of the second acrylic salt chamber; A heating hole, the heating hole being arranged at the top 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.

8. Experimental method for the injection and production of oil in interstitial storage of high-impurity salt mine sediment, characterized in that: The method comprises: Connect according to the high-impurity salt mine slag void oil storage injection and production operation parameter optimization device of claim 7, and check the sealing performance of the device; When the sealing of the device is intact, sediment particles are placed in the first acrylic salt chamber and the second acrylic salt chamber respectively, the oil to be tested is added to the first oil reservoir and the second oil reservoir respectively, and brine is added to 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 started 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 storage tank respectively, and an oil injection and brine removal experiment is performed on the sediment gap, and the oil injection rate and brine removal rate are recorded, and the whole process of oil injection and brine removal is recorded by a high-speed camera; Performing an oil storage test of 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, starting the temperature controller and the heating hole, so that the first acrylic salt chamber and the second acrylic salt chamber reach a preset ground temperature environment; The brine reservoir is connected to the first oil reservoir and the second oil reservoir respectively to carry out a brine injection oil recovery experiment in the sediment gap, record the oil recovery rate and the brine injection rate, and record the whole process of brine injection oil recovery by 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, so as to calculate the sediment content and analyze the quality of the collected oil; The recorded test data are analyzed to optimize the sediment void storage injection and production operation parameters.

9. The high-impurity salt mine sludge interstitial oil storage injection and production operation experimental method according to claim 8, characterized in that: The method further comprises: replacing sediment particles with different particle gradations, brine with different concentrations and different types of oil products to conduct an oil injection and brine removal experiment or a brine injection and oil production experiment; after the experiment, performing CT and nuclear magnetic resonance scanning on the sediment particles to analyze the deterioration ability of the sediment particles.

10. A method for optimizing the operating parameters of void oil storage and production in high-impurity salt mine sediment, characterized in that: The method comprises: The salt mine slag void oil storage injection and production operation parameter optimization device according to claim 7 is installed, and the sealing of the device is ensured; The particle size distribution of sediment particles is determined by interlayer collapse test and water dissolution test; The injection and production operation parameters are optimized and analyzed by the salt mine slag interstitial oil storage injection and production operation parameter experimental method and control variable method described in claim 9; On the basis of ensuring the oil recovery capacity of the sediment voids, adjust the injection and production rate of the target oil product and the displacement liquid, replace different types of oil products and displacement liquids of different concentrations, and analyze the physical and chemical performance indicators of the oil products produced from the sediment voids to determine the best storage oil product, displacement liquid type and injection and production 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; According to the deterioration performance of the sediment particles and the pressure in the device, the number of injection and production operations is adjusted to determine the injection and production cycle of the sediment interstitial oil storage; According to the amount of oil recovery in the sediment voids, the particle size distribution and sediment content of the sediment particles are adjusted; By processing the operating parameters by computer and analyzing their correlation, the optimal parameter ranges for sediment content, temperature, injection rate and pressure during the sediment void storage and production operation are determined, the type of stored oil and the type of displacing liquid are determined, and guidance is provided for the actual salt cavern sediment storage and production operating parameters, thereby achieving efficient operation of high-impurity salt cavern sediment oil storage depots.

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