Method for evaluating operation safety of salt cavern storage and related equipment

Abstract

The application provides a salt cavern oil storage operation safety evaluation method and related equipment. The method comprises the following steps: presetting an initial oil pressure gradient pressure value; obtaining a volume shrinkage of the salt cavity after each creep; calculating a pressure change increment of crude oil based on the volume shrinkage and a crude oil compression factor to obtain a new oil pressure; and obtaining a comparison result of the new oil pressure and an upper limit operation pressure of the oil storage, and opening a wellhead to release the pressure of the salt cavity when the comparison result indicates that the new oil pressure exceeds the upper limit operation pressure. On the basis of traditional oil pressure gradient stability calculation, the calculation method of oil pressure dynamic change is added, so that the calculation of the current salt cavern oil storage salt cavity oil pressure is more in line with the actual field working condition, the underground stability calculation of the oil storage is more accurate, thereby the precise control and analysis of the stability of the salt cavern oil storage are facilitated, and the safety of the operation of the salt cavern oil storage is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil reservoir storage, and more particularly to a salt cavern oil storage depot operation safety evaluation method, a salt cavern oil storage depot operation safety evaluation device, an electronic device and a storage medium. BACKGROUND

[0002] The stability evaluation of the underground salt cavern oil storage depot is a core problem that needs to be considered in the construction process of the oil storage depot. The long-term safety evaluation method of the oil storage depot is based on numerical simulation software. By inputting the corresponding mechanical parameters, the safety and reliability of the salt cavern oil storage depot under long-term operation conditions are simulated. This method is specifically disclosed in patent CN201910381324.7. However, the existing salt cavern oil storage depot stability calculation method generally only considers the oil pressure gradient factor, and lacks consideration of the dynamic change of the oil pressure of the oil storage depot. However, in the actual operation process of the oil storage depot, the oil pressure of the oil storage depot will change under the condition of salt cavity creep shrinkage. The oil pressure of the cavity needs to be monitored in real time. Once the set upper limit pressure is reached, the wellhead needs to be opened to release the pressure in the cavity, thereby ensuring the stability of the salt cavity. It is very one-sided to judge the stability of the salt cavern oil storage depot only according to the oil pressure gradient, and the precision is low. It is impossible to realize the dynamic change of the oil pressure and the opening of the well for pressure relief. This does not conform to the actual engineering, and once the judgment is wrong, it is easy to cause safety hazards.

[0003] Therefore, there is an urgent need for a new technical solution to solve the above technical problems. SUMMARY

[0004] A series of simplified concepts are introduced in the summary section. This will be further described in detail in the detailed description section. The summary section of the present application does not mean to attempt to limit the key features and necessary technical features of the claimed technical solution, and even less to determine the protection scope of the claimed technical solution.

[0005] In a first aspect, the present application provides a salt cavern oil storage depot operation safety evaluation method, comprising: presetting an initial oil pressure gradient pressure value; obtaining the volume shrinkage of the salt cavity after each creep; based on the volume shrinkage and the crude oil compression factor, calculating the pressure change increment of the crude oil to obtain a new oil pressure; obtaining the comparison result of the new oil pressure and the upper limit operating pressure of the oil storage depot, and opening the wellhead when the comparison result indicates that the new oil pressure exceeds the upper limit operating pressure to release the pressure of the salt cavity.

[0006] Optionally, the method further comprises: before the creep, obtaining the total shrinkage of the volume of the salt cavity; and based on the total shrinkage, determining the volume shrinkage of the salt cavity.

[0007] Optionally, the volume shrinkage of the salt cavern is determined based on the total shrinkage, including: determining a volume ratio factor of the oil storage volume in the salt cavern according to the height of the sediment surface; and multiplying the total shrinkage by the volume ratio factor of the oil storage volume to obtain the volume shrinkage of the salt cavern.

[0008] Optionally, the pressure change increment of the crude oil is calculated based on the volume shrinkage and a crude oil compression factor, including: dividing the volume shrinkage by the crude oil compression factor to obtain the pressure change increment.

[0009] Optionally, the method further includes: obtaining a pressure value of the highest point of the salt cavern; adding the pressure value of the highest point to the pressure change increment to obtain a final judgment oil pressure; and obtaining a comparison result of the final judgment oil pressure and an upper limit operating pressure of the oil storage depot, and opening the wellhead to release the pressure of the salt cavern when the comparison result indicates that the final judgment oil pressure exceeds the upper limit operating pressure.

[0010] Optionally, the method further includes: obtaining an operating service life of the oil storage depot; and stopping the operation safety monitoring of the oil storage depot when the operating service life exceeds a preset operating service life.

[0011] Optionally, the method further includes: generating a warning signal when the comparison result indicates that a new oil pressure exceeds a preset ratio of the upper limit operating pressure.

[0012] In a second aspect, a salt cavern oil storage depot operation safety evaluation device is provided, including: an input module configured to preset an initial oil pressure gradient pressure value; a first calculation module configured to obtain a volume shrinkage of the salt cavern after each creep; a second calculation module configured to calculate a pressure change increment of the crude oil based on the volume shrinkage and a crude oil compression factor to obtain a new oil pressure; and an execution module configured to obtain a comparison result of the new oil pressure and an upper limit operating pressure of the oil storage depot, and open the wellhead to release the pressure of the salt cavern when the comparison result indicates that the new oil pressure exceeds the upper limit operating pressure.

[0013] In a third aspect, an electronic device is provided, including a processor and a memory, wherein the memory stores computer program instructions, and the computer program instructions are used to execute the salt cavern oil storage depot operation safety evaluation method as described above when executed by the processor.

[0014] In a fourth aspect, a storage medium is provided, and program instructions are stored on the storage medium, and the program instructions are used to execute the salt cavern oil storage depot operation safety evaluation method as described above when executed.

[0015] The method provided in the application, by presetting an initial oil pressure gradient pressure value, simultaneously, acquiring the volume shrinkage of the salt cavity after each creep in real time, calculating a new oil pressure based on the volume shrinkage of the salt cavity and the real-time crude oil compression factor, comparing the new oil pressure with the upper limit operating pressure of the oil storage depot in real time, not only considers the influence of the changing oil pressure on the stability of the oil storage depot, but also establishes a new stability evaluation criterion and method of the oil storage depot, so that the calculation of the current salt cavity oil pressure of the salt cavern oil storage depot is more in line with the actual field working conditions, and the underground stability calculation of the oil storage depot is more accurate, thereby being beneficial to real-time and accurate control and analysis of the stability of the salt cavern oil storage depot, and further improving the safety of the salt cavern oil storage depot.

[0016] The salt cavern oil storage depot operation safety evaluation method of the application, other advantages, objects and features of the application will be embodied in part through the following description, and will be understood by those skilled in the art through research and practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0017] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are intended to only illustrate preferred embodiments and are not intended to limit the scope of the specification. Moreover, like reference numerals designate like parts throughout the several views in the drawings. In the drawings:

[0018] Figure 1 A schematic flow chart of a salt cavern oil storage depot operation safety evaluation method according to one embodiment of the application is shown;

[0019] Figure 2 A schematic diagram of a salt cavern oil storage depot according to one embodiment of the application is shown;

[0020] Figure 3 A schematic block diagram of a salt cavern oil storage depot operation safety evaluation device according to one embodiment of the application is shown;

[0021] Figure 4 A schematic block diagram of an electronic device according to one embodiment of the application is shown. DETAILED DESCRIPTION

[0022] The terms "first", "second", "third", "fourth" etc. (if any) in the description and claims of the present application and in the above drawings are used for distinguishing between similar objects, not necessarily for describing a particular sequential or chronological order. It is to be understood that the use of data between steps in any illustrative diagram is for presenting the illustrative diagram according to the present application concepts, unless otherwise particularly noted in the illustrative diagram. Moreover, the use of the terms first, second, third, etc. does not denote any ordering, but can be used for naming purposes, to distinguish one element from another. Additionally, the terms "comprises", "comprising", "includes", "including" and "contains", "containing" as well as any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises, includes or contains a list of steps or elements does not include only those steps or elements but can include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. The following will describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0023] According to a first aspect of the present application, a salt cavern oil storage operation safety evaluation method is provided. Figure 1 A schematic flow chart of a salt cavern oil storage operation safety evaluation method 100 according to an embodiment of the present application is shown. The method 100 can include the following steps:

[0024] In step S110, an initial oil pressure gradient pressure value is preset.

[0025] Specifically, the initial oil pressure gradient pressure value can be set according to the actual needs of the enterprise, the actual operation experience of the personnel, or the equipment situation and the oil storage situation of the oil storage, and the specific value is not limited here. For example, the wellhead pressure is zero, and the initial oil pressure gradient P0 is set. It can be understood that since the oil pressure value is proportional to the liquid surface depth, the oil pressure gradient P0 gradually increases with the increase of the depth from the wellhead position.

[0026] In step S120, the volume shrinkage of the salt cavity after each creep is obtained.

[0027] It can be understood that the volume shrinkage of the salt cavity is the volume shrinkage of a certain point of the salt cavity. Specifically, the volume shrinkage of the salt cavity after each creep can be calculated according to the total shrinkage of the volume of the salt cavity, and can also be obtained by using FLAC language to calculate the creep of the salt cavity.

[0028] In step S130, based on the volume shrinkage and the crude oil compression factor, the pressure change increment of the crude oil is calculated to obtain a new oil pressure.

[0029] Exemplarily, the crude oil compression factor can be represented by Specifically, It can be calculated according to the following formula:

[0030]

[0031] wherein, is the density of the crude oil at 0.1 MPa, g / ml, T is the Kelvin Celsius degree, e is the natural index, is the set operating pressure, wherein the temperature T can be obtained according to the geothermal gradient. The pressure change increment of the crude oil can be represented by ΔP. Specifically, ΔP can be calculated according to the following formula:

[0032]

[0033] wherein, is the volume shrinkage of the salt cavity calculated in step S120.

[0034] The new oil pressure can be represented by Specifically, can be calculated according to the following formula:

[0035]

[0036] Step S140, obtaining the comparison result of the new oil pressure and the upper limit operating pressure of the oil storage library, and opening the wellhead when the comparison result indicates that the new oil pressure exceeds the upper limit operating pressure to release the pressure of the salt cavity.

[0037] Exemplarily, the upper limit operating pressure of the oil storage library can be represented by . In the case that the new oil pressure is greater than or equal to the upper limit operating pressure of the oil storage library, it is judged that the new oil pressure exceeds the upper limit operating pressure, at which time the wellhead can be opened to release the pressure of the salt cavity. In the case that the new oil pressure is less than the upper limit operating pressure of the oil storage library, it is judged that the new oil pressure has not exceeded the upper limit operating pressure, and the wellhead can be kept closed. It can be understood that the volume of the salt cavity continues to shrink at this time.

[0038] The method provided in the present application, by presetting the initial oil pressure gradient pressure value, simultaneously, obtaining the volume shrinkage of the salt cavity after each creep, calculating the new oil pressure based on the volume shrinkage of the salt cavity and the real-time oil compression factor, comparing the new oil pressure with the upper limit operating pressure of the oil storage library in real time, not only considers the volume shrinkage, displacement change and stress change of the salt cavity of the oil storage library to judge the stability of the oil storage library, but also comprehensively considers the dynamic change amount of the oil pressure of the oil storage library, so that the calculation of the current salt cavity oil pressure of the oil storage library is more in line with the actual field working conditions, and the calculation of the underground stability of the oil storage library is more accurate, thereby facilitating real-time and accurate control and analysis of the stability of the salt cavity oil storage library, and further improving the safety of the salt cavity oil storage library.

[0039] Optionally, the method 100 can further include:

[0040] Step S150, obtaining a total shrinkage of the volume of the salt cavern before the creep.

[0041] Exemplarily, the total shrinkage of the volume of the salt cavern can be represented as Specifically, may be calculated according to the fish language of FLAC, and the specific calculation process is not limited herein.

[0042] Step S160, determining the volume shrinkage of the salt cavern based on the total shrinkage.

[0043] Exemplarily, the volume shrinkage of the salt cavern can be determined according to, for example, the volume proportion of each type of substance such as sediment, brine, crude oil, and the total shrinkage .

[0044] The above method, by obtaining the total shrinkage of the volume of the salt cavern before the creep, and determining the volume shrinkage of the salt cavern based on the total shrinkage, realizes the accurate determination of the volume shrinkage of the salt cavern, and further improves the calculation accuracy of the new oil pressure, which is beneficial to the accurate control of the oil pressure stability of the salt cavern in real time.

[0045] Optionally, the step S150 of determining the volume shrinkage of the salt cavern based on the total shrinkage can include the following steps:

[0046] Step S151, determining a proportion factor of the oil storage volume in the salt cavern according to the sediment surface height.

[0047] Exemplarily, the proportion factor of the oil storage volume can be represented as Specifically, the crude oil surface height can be determined according to the total height of the salt cavern and the sediment surface height, and then the proportion factor c1 of the oil storage volume in the salt cavern can be determined.

[0048] Step S152, multiplying the total shrinkage and the proportion factor of the oil storage volume to obtain the volume shrinkage of the salt cavern.

[0049] Exemplarily, , wherein is the volume shrinkage of the salt cavern, is the total shrinkage, and c1 is the proportion factor of the oil storage volume.

[0050] The above method, by determining the proportion factor of the oil storage volume in the salt cavern according to the sediment surface height, and then determining the volume shrinkage of the salt cavern according to the total shrinkage and the proportion factor of the oil storage volume, improves the calculation accuracy of the volume shrinkage of the salt cavern, and further improves the calculation accuracy of the new oil pressure, which is beneficial to the accurate control of the oil pressure stability of the salt cavern in real time.

[0051] Optionally, the step S130 of calculating the pressure change increment of the crude oil based on the volume shrinkage and the crude oil compression factor can include the following steps:

[0052] The step S131 of dividing the volume shrinkage by the crude oil compression factor to obtain the pressure change increment.

[0053] Exemplarily, the pressure change increment of the crude oil can be denoted as ΔP. Specifically, ΔP can be calculated according to the following formula:

[0054]

[0055] wherein, is the volume shrinkage of the salt cavity calculated in the step S120.

[0056] The above method, by calculating the pressure change increment of the crude oil according to the volume shrinkage and the crude oil compression factor, and then determining the new oil pressure at a certain point in the salt cavity according to the pressure change increment of the crude oil and the initial oil pressure gradient, can realize the accurate control of the current oil pressure at a certain point in the salt cavity, and is conducive to improving the stability of the oil pressure in the salt cavity.

[0057] Optionally, the method 100 can further include the following steps:

[0058] The step S170 of obtaining the pressure value of the highest point of the salt cavity.

[0059] Exemplarily, Figure 2 A schematic diagram of salt cavern oil storage closed well is shown according to an embodiment of the present application. Wherein, 1 is an injection and production oil well, 2 is an injection and production brine well, 3 is the highest point of the top of the salt cavity, 4 is the sediment surface, 5 is the sediment, 6 is the brine in the sediment gap, 7 is the bottom passage of the salt cavity, 8 is the injection and production oil valve, and 9 is the injection and production brine valve. Since the oil pressure in the oil storage well is in a positive proportional relationship with the depth of the salt cavity, it can be understood that the highest point 3 of the top of the salt cavity is the lowest position of the oil pressure in the salt cavity. Therefore, it can be understood that the upper limit of the oil pressure of the oil storage can be set as the oil pressure value at the highest point 3 of the top of the salt cavity.

[0060] The step S180 of adding the pressure value of the highest point to the pressure change increment to obtain the final judgment oil pressure.

[0061] Exemplarily, the final judgment oil pressure can be denoted as Pfinal. As shown in the formula (3), the pressure value of the highest point can be denoted as Pmax. Figure 2 ​​The oil pressure in the oil storage well is proportional to the depth of the salt cavity. It can be understood that the highest point 3 of the top of the salt cavity is the lowest position of the oil pressure of the salt cavity. Therefore, the upper limit of the oil pressure of the oil storage depot can be set as the oil pressure value at the highest point 3 of the top of the salt cavity. That is, the new oil pressure at the highest point 3 of the top of the salt cavity is the minimum position of the overall pressure of the salt cavity. If the new oil pressure at the highest point 3 of the top of the salt cavity exceeds the upper limit operating pressure of the oil storage depot , the overall oil pressure of the salt cavity has exceeded the upper limit operating pressure of the oil storage depot . Based on this, the new oil pressure at the highest point 3 of the top of the salt cavity can be used as the final judgment oil pressure . Therefore, the upper limit operating pressure of the oil storage depot can be calculated by the following formula: .

[0062] Step S190, obtaining the comparison result of the final judgment oil pressure and the upper limit operating pressure of the oil storage depot. When the comparison result indicates that the final judgment oil pressure exceeds the upper limit operating pressure, the wellhead is opened to release the pressure of the salt cavity.

[0063] Exemplarily, when the final judgment oil pressure is greater than or equal to the upper limit operating pressure of the oil storage depot , it is judged that the oil pressure exceeds the upper limit operating pressure, and at this time the wellhead can be opened to release the pressure of the salt cavity. When the final judgment oil pressure is less than the upper limit operating pressure of the oil storage depot , it is judged that the oil pressure has not exceeded the upper limit operating pressure, and the wellhead can be kept closed. It can be understood that at this time the volume of the salt cavity continues to shrink.

[0064] The above method uses the new oil pressure at the highest point of the salt cavity calculated in real time as the final judgment oil pressure, compares it with the upper limit operating pressure of the oil storage depot, and judges in real time whether the oil pressure of the salt cavity exceeds the upper limit operating pressure, which simplifies the judgment process of whether the oil pressure of the salt cavity exceeds the upper limit operating pressure on the basis of ensuring the accurate determination of the oil pressure of the salt cavity, is conducive to the real-time control of the stability of the salt cavity, and further ensures the stability and safety of the oil pressure of the salt cavity.

[0065] Optionally, the method can further include the following steps:

[0066] Step S210, obtaining the operating life of the oil storage depot.

[0067] Exemplarily, the operating life of the oil storage depot can be obtained by any existing or future technical solution, which is not limited herein.

[0068] Step S220, stopping the operation safety monitoring of the oil storage depot when the operating life exceeds the preset operating life.

[0069] It is understandable that if an oil depot continues to operate beyond its preset operating lifespan, it will pose certain risks. Therefore, oil depots that have exceeded their preset operating lifespan are shut down, and the monitoring of their operational safety is stopped. The preset operating lifespan can be set arbitrarily and reasonably based on experience or actual conditions, and is not limited here.

[0070] The above method, by measuring the operating life of the oil storage depot, stops monitoring its operational safety when the depot exceeds the preset operating life, thus saving monitoring resources and facilitating the monitoring of the operational safety of other normally operating oil storage depots.

[0071] Optionally, the method may further include generating a warning signal when the comparison result indicates that the new oil pressure exceeds a preset ratio of the upper limit operating pressure.

[0072] Specifically, the preset ratio of the upper limit operating pressure can be set based on the actual operating experience of personnel, the equipment conditions of the oil storage facility, and the oil storage volume. There is no specific limitation on the value of the preset ratio of the upper limit operating pressure; it can be any reasonable value such as 80% or 90%. It is understood that the above comparison result is the ratio of the new oil pressure to the upper limit operating pressure. For example, the warning signal can be a high-frequency sound signal or a flashing red light signal; there are no specific limitations. For instance, when the ratio of the new oil pressure to the upper limit operating pressure exceeds the preset ratio, a high-frequency sound signal can be automatically generated to remind personnel to open the wellhead in time, allowing the salt chamber oil pressure to return to a stable value. The above method, by generating a warning signal when the comparison result indicates that the new oil pressure exceeds the preset ratio of the upper limit operating pressure, allows personnel to more directly control the salt chamber oil pressure in real time, promptly avoid the danger of excessive oil pressure, and improve the safety of the oil storage facility.

[0073] It is understandable that all the above calculations are for, for example, Figure 2 The pressure calculation process for one side of the salt chamber is shown above. The pressure calculation process for the other side of the salt chamber is the same as the above calculation operation, and will not be repeated here.

[0074] It is understandable that the above-mentioned method for evaluating the operational safety of salt cavern oil storage facilities is applicable to the stability evaluation of oil storage facilities in three-dimensional geological models.

[0075] According to a second aspect of the present invention, a safety evaluation device for the operation of a salt cavern oil storage facility is provided. Figure 3 A schematic block diagram of a salt cavern oil storage facility operation safety evaluation device 300 according to an embodiment of the present invention is shown. Figure 3 As shown, the device 300 may include: an input module 310, a first calculation module 320, a second calculation module 330, and an execution module 340.

[0076] Input module 310 is used to preset the initial oil pressure gradient pressure value.

[0077] The first calculation module 320 obtains the volume shrinkage of the salt cavity after each creep.

[0078] The second calculation module 330 is used to calculate the pressure change increment of crude oil based on the volume shrinkage and crude oil compressibility factor in order to obtain the new oil pressure.

[0079] The execution module 340 is used to obtain the comparison result between the new oil pressure and the upper limit operating pressure of the oil storage tank. When the comparison result indicates that the new oil pressure exceeds the upper limit operating pressure, the wellhead is opened to release the pressure in the salt chamber.

[0080] According to a third aspect of the present invention, an electronic device is also provided. Figure 4 A schematic block diagram of an electronic device 400 according to an embodiment of the present invention is shown. Figure 4 As shown, the electronic device 400 includes a processor 410 and a memory 420, wherein the memory 420 stores computer program instructions, which are executed by the processor 410 to perform the salt cavern oil storage safety evaluation method as described above.

[0081] According to a fourth aspect of the present invention, a storage medium is also provided, on which program instructions are stored, which, when executed, are used to perform the salt cavern oil storage facility operation safety evaluation method as described above. The storage medium may, for example, include a storage component of a tablet computer, a hard disk of a computer, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a portable compact disc read-only memory (CD-ROM), a USB memory, or any combination of the above storage media. The computer-readable storage medium may be any combination of one or more computer-readable storage media.

[0082] Those skilled in the art can understand the specific details and beneficial effects of the salt cavern oil storage safety evaluation device, electronic equipment, and storage medium by reading the above description of the relevant methods for evaluating the operation safety of salt cavern oil storage. For the sake of brevity, these details will not be repeated here.

[0083] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and / or device can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0084] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0085] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0086] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A method for evaluating the operational safety of salt cavern oil storage facilities, characterized in that, include: Preset the initial oil pressure gradient pressure value; Obtain the volume shrinkage of the salt cavity after each creep; The incremental pressure change of crude oil is calculated based on the volume shrinkage and crude oil compressibility factor to obtain the new oil pressure. Obtain the comparison result between the new oil pressure and the upper limit operating pressure of the oil storage tank. When the comparison result indicates that the new oil pressure exceeds the upper limit operating pressure, open the wellhead to release the pressure in the salt chamber. The method further includes: After the creep, the total shrinkage of the salt cavity volume is obtained; Based on the total shrinkage, the volume shrinkage of the salt cavity is determined, including: The proportion factor of the oil storage volume in the salt cavity is determined based on the height of the sediment surface; Multiply the total shrinkage by the percentage factor of the oil storage volume to obtain the volume shrinkage of the salt cavity; The calculation of the pressure change increment of crude oil based on the volume shrinkage and crude oil compressibility factor includes: The pressure change increment is obtained by dividing the volume shrinkage by the crude oil compressibility factor.

2. The method for evaluating the operational safety of salt cavern oil storage facilities as described in claim 1, characterized in that, The method further includes: Obtain the pressure value at the highest point of the salt chamber; The pressure value at the highest point is added to the pressure change increment to obtain the final oil pressure. Obtain the comparison result between the final determined oil pressure and the upper limit operating pressure of the oil storage tank. When the comparison result indicates that the final determined oil pressure exceeds the upper limit operating pressure, open the wellhead to release the pressure in the salt chamber.

3. The method for evaluating the operational safety of salt cavern oil storage facilities as described in claim 1, characterized in that, The method further includes: Obtain the operating years of the oil storage facility; When the operating life exceeds the preset operating life, the operation safety monitoring of the oil storage depot shall be stopped.

4. The method for evaluating the operational safety of salt cavern oil storage facilities as described in claim 1, characterized in that, The method further includes: When the comparison result indicates that the new oil pressure exceeds the preset ratio of the upper limit operating pressure, a warning signal is generated.

5. A safety evaluation device for salt cavern oil storage depots, characterized in that, include: The input module is used to preset the initial oil pressure gradient pressure value; The first calculation module obtains the volume shrinkage of the salt cavity after each creep. The second calculation module is used to calculate the pressure change increment of crude oil based on the volume shrinkage and crude oil compressibility factor in order to obtain the new oil pressure. The execution module is used to obtain the comparison result between the new oil pressure and the upper limit operating pressure of the oil storage tank, and to open the wellhead when the comparison result indicates that the new oil pressure exceeds the upper limit operating pressure to release the pressure in the salt chamber; After the creep, the total shrinkage of the salt cavity volume is obtained; Based on the total shrinkage, the volume shrinkage of the salt cavity is determined, including: The proportion factor of the oil storage volume in the salt cavity is determined based on the height of the sediment surface; Multiply the total shrinkage by the percentage factor of the oil storage volume to obtain the volume shrinkage of the salt cavity; The calculation of the pressure change increment of crude oil based on the volume shrinkage and crude oil compressibility factor includes: The pressure change increment is obtained by dividing the volume shrinkage by the crude oil compressibility factor.

6. An electronic device, characterized in that, It includes a processor and a memory, wherein the memory stores computer program instructions, which are executed by the processor to perform the salt cavern oil storage safety evaluation method as described in any one of claims 1 to 4.

7. A storage medium storing program instructions, which, when executed, perform the salt cavern oil storage safety evaluation method as described in any one of claims 1 to 4.

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