Method for calculating salt cavern volume and depicting internal structure through brine injection
By combining historical brine extraction data and rock mechanics experiments with wellhead brine injection monitoring, the volume of salt caverns and the internal structure were calculated, solving the problem of describing the volume and internal structure of salt caverns and enabling the acquisition of detailed parameters for salt cavern gas storage.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- PETROCHINA CO LTD
- Filing Date
- 2024-11-21
- Publication Date
- 2026-05-22
AI Technical Summary
Existing technologies struggle to accurately describe the volume and internal structure of salt caverns, especially in the evaluation and utilization of salt cavern gas storage facilities, where sonar detection has limitations.
The volume of underground brine was calculated by analyzing historical brine extraction data. The bulk modulus of the salt cavern sediment and the surrounding rock was determined by combining rock mechanics experiments. The flow rate and pressure changes of the brine injected into the wellhead were monitored. The volume and internal structure of the salt cavern were calculated by integrating multiple data.
It improves the calculation capabilities of salt cavern volume and internal structure, provides detailed parameters for salt cavern gas storage, and provides a data foundation for the evaluation and utilization of salt caverns.
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Figure CN122071960A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of salt cavern gas storage technology, and in particular to a method for calculating the volume of a salt cavern and characterizing its internal structure by injecting brine. Background Technology
[0002] Salt cavern gas storage facilities utilize underground salt caverns to store natural gas. Salt cavern description is fundamental for salt cavern evaluation and utilization. The description mainly includes the volume of sediment inside the salt cavern, the volume of brine above the sediment, and the overall morphology of the salt cavern. This information is used to further evaluate the gas injection and brine drainage process, predict the volume of brine that can be drained, and assess the stability of the cavity.
[0003] Currently, techniques for describing salt caverns include sonar detection. This involves injecting brine or other fluid media into the salt cavern, then sending sound waves to generate a three-dimensional image of the cavern using the reflection characteristics of the sound waves at the cavern boundary. This method can accurately depict the boundaries, size, and shape of the salt cavern, providing reliable data support for gas storage design, stability assessment, and subsequent management. Sonar detection technology is suitable for cavity environments, enabling rapid data acquisition and the generation of high-resolution salt cavern structure maps, laying the foundation for the safe operation of underground gas storage facilities.
[0004] However, sonar detection techniques each have their limitations and cannot adequately describe the characteristics of salt caves. Therefore, there is an urgent need for a method that can describe the characteristics of salt caves, such as their volume and internal structure. Summary of the Invention
[0005] This application provides a method for calculating the volume of salt caverns and characterizing their internal structure during brine injection, which can solve the technical problem of poor ability to calculate the volume of salt caverns and characterize their internal structure during brine injection.
[0006] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:
[0007] In a first aspect, embodiments of this application provide a method for calculating the volume of a salt cavern and characterizing its internal structure during brine injection. This method includes: calculating the volume of underground brine based on historical brine extraction data; determining the bulk modulus of the salt cavern sediment and the bulk modulus of the surrounding rock based on rock mechanics experiments; determining the bulk modulus of the saturated brine; determining the injection flow rate variation and the wellhead pressure variation; the injection flow rate variation is the flow rate variation of the brine injected into the salt cavern; the wellhead pressure variation is the pressure variation at the wellhead of the salt cavern; confirming the sediment rock volume based on the underground brine volume, the salt cavern sediment bulk modulus, the surrounding rock bulk modulus, the saturated brine bulk modulus, the injection flow rate variation, and the wellhead pressure variation; obtaining the salt cavern volume based on the underground brine volume and the sediment rock volume; obtaining the sediment volume based on the salt cavern volume and the sonar-detected volume; and obtaining the sediment porosity based on the underground brine volume, the sonar-detected volume, and the sediment volume.
[0008] Based on the above description of the method for calculating the volume of salt caverns and characterizing their internal structure using brine injection provided in this application embodiment, it can be understood that this method involves injecting a small amount of brine at the wellhead and monitoring the pressure, then combining this with historical brine production data to calculate the volume of the salt cavern and characterize the distribution of sediment within the salt cavern, including the volume and porosity of the sediment. In this way, by comprehensively calculating various data, the volume of the salt cavern gas storage facility and the internal characteristic parameters of the salt cavern are obtained, providing a data foundation for the evaluation and utilization of the salt cavern and improving the ability to calculate the volume of salt caverns and characterize their internal structure using brine injection.
[0009] In the feasible implementation method of the first aspect, the formula for calculating the volume of underground brine includes:
[0010] V brine =1.14×V salt ;
[0011] Among them, V brine =Table 1.1 shows 4 as ×V ground salt Lower halogen V bri water ne = Volume 1. Volume 14; × V salt This represents historical data on brine extraction.
[0012] In the feasible implementation of the first aspect, the formula for calculating the volume of sediment rock includes:
[0013]
[0014] Among them, V brine =Table 1.1 shows 4 as ×V ground salt Lower brine volume; ΔV represents the change in injection flow rate; ΔP represents the change in wellhead pressure; K rock K represents the bulk modulus of salt cavern sediment. sRepresented as the bulk modulus of the surrounding rock; K brine V represents the bulk modulus of saturated brine. rock It is expressed as the volume of sediment rock.
[0015] In the feasible implementation of the first aspect, the formula for calculating the salt cavern volume includes:
[0016] V C =V brine +V rock ;
[0017] Among them, V C V represents the volume of the salt cavern. brine =Table 1.1 shows 4 as ×V ground salt Volume of brine; V rock It is expressed as the volume of sediment rock.
[0018] In the feasible implementation of the first aspect, the formula for calculating the volume of sediment includes:
[0019] V dip =V C -V sonar ;
[0020] Among them, V dip V is expressed as the volume of sediment; C Represented as salt cavern V volume dip Product = V; C -V sonar This represents the volume detected by the sonar.
[0021] In the feasible implementation of the first aspect, the formula for calculating the porosity of the sediment includes:
[0022]
[0023] Where ψ represents the porosity of the sediment; V dip V is expressed as the volume of sediment; brine =Table 1.1 shows 4 as ×V ground salt Lower brine V body dip Product = V; C -V sonar This represents the volume detected by the sonar.
[0024] In the feasible implementation of the first aspect, the formula for calculating the porosity of the sediment includes:
[0025]
[0026] Where ψ represents the porosity of the sediment; V rock V represents the volume of sediment rock; dip It is expressed as the volume of sediment.
[0027] In the feasible implementation of the first aspect, the injection flow rate change value is the average flow rate obtained from multiple periodic measurements; the wellhead pressure change value is the average pressure obtained from multiple periodic measurements.
[0028] Secondly, embodiments of this application provide a system for calculating the volume of a salt cavern and characterizing its internal structure during brine injection. The system includes: at least one processor; a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, which are executed by the at least one processor to enable the at least one processor to perform the method provided in the first aspect.
[0029] The system for calculating salt cavern volume and characterizing internal structure through brine injection calculates the salt cavern volume and characterizes the internal sediment distribution, including sediment volume and porosity, by implementing the method provided in the first aspect. This is achieved by injecting a small amount of brine at the wellhead and monitoring the pressure, combined with historical brine production data. By integrating this data, the system calculates the volume of the salt cavern gas storage facility and its internal characteristic parameters, providing a data foundation for the evaluation and utilization of salt caverns and improving the ability to calculate salt cavern volume and characterize its internal structure through brine injection.
[0030] Thirdly, embodiments of this application provide a computer-readable medium having computer program instructions stored thereon, which can be executed by a processor to implement the method provided in the first aspect.
[0031] The computer program instructions in the computer-readable medium implement the method provided in the first aspect, by injecting a small amount of brine at the wellhead and monitoring the pressure, and combining historical brine production data, to calculate the volume of the salt cavern and characterize the distribution of sediment inside the salt cavern, including the volume and porosity of the sediment. In this way, by integrating multiple data sources, the volume of the salt cavern gas storage facility and the internal characteristic parameters of the salt cavern are calculated, providing a data foundation for the evaluation and utilization of the salt cavern, and improving the ability to calculate the volume of the salt cavern and characterize its internal structure through brine injection. Attached Figure Description
[0032] Figure 1 This is a schematic diagram of a system for calculating the volume of a salt cavern and characterizing its internal structure using brine injection, provided in an embodiment of this application.
[0033] Figure 2 A flowchart illustrating a method for calculating the volume of a salt cavern and characterizing its internal structure through brine injection, provided in an embodiment of this application;
[0034] Figure 3 This is a schematic diagram of the structure of a salt cavern in a method for calculating the volume of a salt cavern and characterizing its internal structure, provided in an embodiment of this application. Detailed Implementation
[0035] The technical solutions of the embodiments of the present invention will be described below with reference to the accompanying drawings. In the description of the embodiments of the present invention, unless otherwise stated, "multiple" refers to two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of a single item or a plurality of items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.
[0036] Furthermore, to facilitate a clear description of the technical solutions in the embodiments of the present invention, the terms "first" and "second" are used to distinguish identical or similar items with substantially the same function and effect. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and that "first" and "second" are not necessarily different. Meanwhile, in the embodiments of the present invention, the terms "exemplary" or "for example" are used to indicate that something is being used as an example, illustration, or description. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of the present invention should not be construed as being more preferred or advantageous than other embodiments or design schemes. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner for ease of understanding.
[0037] The principles and features of this application are described below. The examples given are only for explaining this application and are not intended to limit the scope of this application.
[0038] Salt cavern gas storage facilities are underground storage facilities that utilize the cavities within underground salt layers to store gases such as natural gas. These facilities are created by dissolving and extracting salt from the salt layer, forming large cavities suitable for gas storage. Salt cavern gas storage facilities are widely used for storing natural gas, hydrogen, air, and other gases due to their advantages such as high safety, excellent sealing, and corrosion resistance.
[0039] Salt layers possess low permeability and plasticity, making stored gas less prone to leakage and reducing the risk of contamination. Their stable structure makes them less susceptible to earthquakes and geological activity, resulting in a longer storage lifespan. The extraction of salt caverns can create very large storage spaces, suitable for large-scale gas storage needs. Natural gas and other gases can be injected or extracted as needed, making them suitable for responding to seasonal or short-term demand fluctuations.
[0040] The salt cavern is considered as a container, containing mainly two phases: saturated brine and rock sediments. The sediments, formed by the random accumulation of undissolved rock fragments during the salt dissolution process, are deposited at the bottom of the salt cavern due to gravity.
[0041] Rock mechanics experiments include uniaxial compression tests, triaxial compression tests, creep tests, and tensile and shear tests. Uniaxial compression tests determine the compressive strength and elastic modulus of rock or sediment under uniaxial stress, observing its compression deformation and failure modes. Triaxial compression tests are conducted under triaxial pressure, determining compressive strength and volumetric strain through confining pressure and axial pressure loading, simulating multiaxial stress environments underground. Creep tests measure long-term deformation behavior under constant stress, particularly suitable for materials prone to creep such as salt rock and sediment. Tensile and shear tests evaluate the tensile and shear strength of materials to understand their response under tensile or shear stress.
[0042] The gas injection and brine drainage process involves injecting gas (such as air or nitrogen) into a mine cavity or brine chamber to displace and drain the brine. This process is widely used in mine drainage, brine extraction, and the maintenance of brine storage chambers. Its main steps include: injecting gas into the chamber through a dedicated gas injection pipe; the gas gradually occupies the chamber space, pushing the brine to the outlet pipe. As the gas injection pressure increases, the brine is forced out of the chamber, thus achieving the purpose of draining the brine. The stability and safety of the process are ensured by adjusting the gas injection pressure and flow rate and monitoring the brine drainage rate. The advantages of this process are that it can effectively reduce the liquid level and pressure in the chamber, prevent corrosion from water vapor formation within the chamber, and control the drainage rate and volume.
[0043] The dischargeable brine volume refers to the actual volume of brine that can be discharged through gas injection or other methods. It is typically limited by factors such as cavity structure, gas pressure, brine viscosity, and density. It is defined as: the maximum volume of brine that can theoretically be discharged from a cavity under certain cavity pressure and equilibrium conditions. Factors include the gas injection pressure, brine density and viscosity, cavity geometry, and the efficiency of the discharge equipment. In practice, the dischargeable brine volume is used to evaluate the effectiveness of the gas injection and discharge process and to control the discharge rate, avoiding insufficient or excessive discharge that could negatively impact the mining process.
[0044] Cavity stability refers to the ability of a cavity structure to remain stable without collapse, deformation, or excessive leakage during gas injection, brine discharge, or mining processes. Cavity stability is crucial because instability can lead to severe geological disasters or safety accidents. Stability assessment includes the following aspects: the mechanical properties of the cavity materials, the supporting capacity of the surrounding rock mass, and rock stability. It is essential to ensure that the pressure inside the cavity is balanced with the external pressure, avoiding excessive pressure differences that could cause deformation or damage. Stress sensors and displacement sensors are typically used to monitor the pressure and deformation of the cavity in real time, allowing for timely detection and handling of potential risks.
[0045] This application provides a method for calculating the volume of salt caverns and characterizing their internal structure through brine injection, applicable to various salt cavern gas storage fields. By injecting a small amount of brine at the wellhead and monitoring the pressure, combined with historical brine production data, the volume of the salt cavern is calculated, and the distribution of sediment within the salt cavern, including sediment volume and internal porosity, is characterized. In this way, by integrating multiple data sources, the volume of the salt cavern gas storage facility and its internal characteristic parameters are calculated, providing a data foundation for the evaluation and utilization of salt caverns and improving the ability to calculate salt cavern volume and characterize their internal structure through brine injection.
[0046] This application provides a system for calculating the volume of salt caverns and characterizing their internal structure through brine injection, which can execute the method for calculating the volume of salt caverns and characterizing their internal structure through brine injection provided in this application. Figure 1 This is a schematic diagram of a system for calculating the volume of a salt cavern and characterizing its internal structure, provided in an embodiment of this application.
[0047] like Figure 1 As shown, the system 001 for calculating the volume of a salt cavern and characterizing its internal structure by injecting brine includes at least one processor 011 and a memory 012 communicatively connected to the at least one processor; wherein, the memory 012 stores instructions that can be executed by the at least one processor 011, and the instructions are executed by the at least one processor 011 to enable the at least one processor 011 to execute the method for calculating the volume of a salt cavern and characterizing its internal structure by injecting brine provided in the embodiments of this application.
[0048] Figure 2 This is a flowchart illustrating a method for calculating the volume of a salt cavern and characterizing its internal structure using brine injection, as provided in an embodiment of this application. Figure 2 As shown, in some embodiments, the method for calculating the volume of a salt cavern and characterizing its internal structure through brine injection includes the following steps:
[0049] S1, calculate the volume of underground brine based on historical brine extraction data.
[0050] like Figure 3 As shown, in some embodiments, the formula for calculating the volume of underground brine includes:
[0051] V brine =1.14×V salt ;
[0052] Among them, V brine =Table 1.1 shows 4 as ×V ground salt Lower halogen V bri water ne = Volume 1. Volume 14; × V salt This represents historical data on brine extraction.
[0053] In one implementation, the cumulative salt extraction from the salt caverns is equivalent to an underground volume of 200,000 m³.3 Substituting the values, we obtain the volume V of the underground brine. brine ==12.21840×0V0 sal m t 3 .
[0054] S2, Based on rock mechanics experiments, the bulk modulus K of salt cavern sediment was determined. rock Bulk modulus K of surrounding rock s .
[0055] Rock mechanics experiments can be used to determine the bulk modulus of salt cavern sediment. The bulk modulus helps to understand the compression characteristics and deformation behavior of the sediment. Because salt cavern sediment may be composed of different types of particulate matter, appropriate experimental methods are required to determine its bulk modulus.
[0056] In some embodiments, the bulk modulus of the salt cavern sediment is determined by a compression experiment. In one implementation, the method for calculating the salt cavern volume and characterizing the internal structure by brine injection during step S2 further includes:
[0057] S21, Sample preparation.
[0058] Collect a certain amount of salt cavern sediment and prepare it into uniformly sized experimental samples (such as cylinders or cubes). For powdery or unconsolidated sediment, compaction methods can be used to make it into samples with a certain strength.
[0059] S22, hydrostatic pressure test.
[0060] Place the sample in a triaxial compression test apparatus or a hydrostatic test apparatus and apply uniform isotropic pressure. Gradually increase the pressure and record the volume change of the sample under different pressures.
[0061] S23, Data Acquisition.
[0062] The volume or density changes of samples are recorded under different uniform pressures, and the compressibility of the material is evaluated by measuring the volumetric strain (the ratio of the change in volume to the initial volume).
[0063] S24. Calculate the bulk modulus according to the definition of bulk modulus.
[0064] In this way, the bulk modulus data of the salt cavern sediment can be obtained through hydrostatic pressure experiments, which can be used to evaluate its stability in the salt cavern and its compression behavior during fluid injection.
[0065] In one implementation, the bulk modulus K of the sediment rock is measured indoors at a stable deep temperature of 50°C in the salt cave. rock =3.2 GPa, the bulk modulus K of the surrounding rock was measured. s =3.45 GPa.
[0066] S3, determine the bulk modulus of saturated brine.
[0067] In some embodiments, the bulk modulus K of the saturated brine is obtained by laboratory determination. brine .
[0068] In one implementation, a high-pressure static experiment is used to determine the bulk modulus of saturated brine. The high-pressure static experiment allows direct measurement of the brine's compressibility under high pressure, thus calculating the bulk modulus. The main steps include: pressurizing the brine using a high-pressure vessel or compression equipment (such as an autoclave); placing the saturated brine in the high-pressure vessel; gradually increasing the pressure; and recording the volume change at different pressures. The bulk modulus is calculated by measuring the rate of change of the brine's volume with pressure.
[0069] In another implementation, the bulk modulus of saturated brine is determined using an ultrasonic method. The ultrasonic method calculates the bulk modulus by measuring the propagation speed of ultrasonic waves in saturated brine. The specific process includes an ultrasonic generator, a receiver, and a data recording system. Ultrasonic waves of a known frequency are emitted into the brine, and their propagation speed is measured. The bulk modulus is then calculated based on the ultrasonic wave propagation speed and the density of the brine.
[0070] For example, the bulk modulus K of saturated brine is determined in the laboratory. brine =3.55 GPa.
[0071] S4, determine the changes in injection flow rate and wellhead pressure.
[0072] The value of the injection flow rate change is the value of the flow rate change of the brine injected into the salt cavern.
[0073] The wellhead pressure change value is the pressure change value at the wellhead of the salt cavern.
[0074] Salt caverns act as containers, where sediments accumulate at the bottom due to gravity. These sediment deposits contain voids that are filled with brine.
[0075] In some embodiments, brine is injected into the salt cavern well using a pump truck or production pipeline.
[0076] In some embodiments, a salt cavern is injected with water via a wellhead pipeline, and changes in wellhead injection flow rate and wellhead pressure are monitored.
[0077] In some embodiments, the injection flow rate change value is the average flow rate obtained from multiple periodic measurements. The wellhead pressure change value is the average pressure obtained from multiple periodic measurements. For example, the average of the injection flow rates obtained from multiple periods is recorded as the injection flow rate change value ΔV = 120 m³ / s. 3 The average value of the pressure changes over multiple cycles is the wellhead pressure change value ΔV = 0.5 MPa.
[0078] To prevent ground leaks from affecting test results, in some embodiments, for old wells in salt mines, the cause of leaks at the wellhead is promptly identified and repaired.
[0079] S5. Based on the underground brine volume, the bulk modulus of the salt cavern sediment, the bulk modulus of the surrounding rock, the bulk modulus of the saturated brine, the change in injection flow rate, and the change in wellhead pressure, the volume of the sediment rock is determined.
[0080] In some embodiments, the formula for calculating the volume of sediment rock includes:
[0081]
[0082] Among them, V brine =Table 1.1 shows 4 as ×V ground salt Lower brine volume; ΔV represents the change in injection flow rate; ΔP represents the change in wellhead pressure; K rock K represents the bulk modulus of salt cavern sediment. s Represented as the bulk modulus of the surrounding rock; K brine V represents the bulk modulus of saturated brine. rock It is expressed as the volume of sediment rock.
[0083] The total volume of the rock block is V. rock Sediment deposits contain voids filled with brine. The volume of brine within these voids is the sum of the volumes of brine within the sediment voids and the volume of brine above the sediment, V. brine The volume of the salt cavern is V. rock and V brine The sum of . Therefore, calculate V. rock and V brine This allows us to obtain the volume of the salt cavern and characterize its internal structure.
[0084] The derivation of the formula is explained below.
[0085] The volume of injected brine is the sum of three factors: the volume of brine, the volume compression of sediment and rock, and the volume expansion of the cavity. Therefore, ΔV brine +ΔV rock +ΔV c =ΔV;
[0086] as well as,
[0087]
[0088] V brine +V rock =V c .
[0089] The solution is obtained by combining the above three formulas.
[0090] For example, the volume V of underground brine brine ==12.21480×0V0 salt m 3 Bulk modulus K of sediment rock rock =3.2 GPa, the bulk modulus K of the surrounding rock was measured. s =3.45 GPa, saturated brine bulk modulus K brine =3.55GPa, injection flow rate change ΔV = 120m 3 If the wellhead pressure change ΔV = 0.5 MPa, then the volume of sediment rock V rock =182098m 3 .
[0091] S6. The volume of the salt cavern is obtained based on the volume of underground brine and the volume of sediment rock.
[0092] In some embodiments, the formula for calculating the salt cavern volume includes:
[0093] V C =V brine +V rock ;
[0094] Among them, V C V represents the volume of the salt cavern. brine =Table 1.1 shows 4 as ×V ground salt Volume of brine; V rock It is expressed as the volume of sediment rock.
[0095] For example, the volume V of underground brine brine ==12.21840×0V0 sa m lt 3 Volume of sediment rock V rock =182098m 3 Then the salt cavern volume V C =410098m 3 .
[0096] S7. The sediment volume is obtained based on the salt cavern volume and the volume detected by sonar.
[0097] In some embodiments, the formula for calculating the volume of sediment includes:
[0098] V dip =V C -V sonar ;
[0099] Among them, V dip V is expressed as the volume of sediment; C Represented as salt cavern V volume dip Product = V; C -Vsonar This represents the volume detected by the sonar.
[0100] S8. The porosity of the sediment is obtained based on the volume of underground brine, the volume detected by sonar, and the volume of sediment.
[0101] In some embodiments, the formula for calculating the porosity of sediment includes:
[0102]
[0103] Where ψ represents the porosity of the sediment; V dip V is expressed as the volume of sediment; brine =Table 1.1 shows 4 as ×V ground salt Lower brine V-body dip Product = V; C -V sonar This represents the volume detected by the sonar.
[0104] For example, sonar detection dip Body = V C Product - V sonar =150000m 3 Salt cavern volume V C =410098m 3 The volume V of the underground brine brine ==12.21840×0V0 sal m t 3 Volume of sediment rock V rock =182098m 3 Then the porosity of the sediment ψ = 1 - 182098 / 260098 = 30%.
[0105] In some embodiments, the calculation of sediment porosity is based on the portion remaining after removing the volume of rock within the sediment. The formula for calculating sediment porosity includes:
[0106]
[0107] Where ψ represents the porosity of the sediment; V rock V represents the volume of sediment rock; dip It is expressed as the volume of sediment.
[0108] The method for calculating the volume of salt caverns and characterizing their internal structure through brine injection, as provided in this application embodiment, involves injecting a small amount of brine at the wellhead and monitoring the pressure. Combined with historical brine production data, the method calculates the volume of the salt cavern and characterizes the distribution of sediment within it, including sediment volume and internal porosity. This comprehensive data analysis yields the volume of the salt cavern gas storage facility and its internal characteristic parameters, providing a data foundation for the evaluation and utilization of salt caverns and improving the ability to calculate salt cavern volume and characterize their internal structure through brine injection.
[0109] Based on the same concept, this application also provides a system for calculating the volume of a salt cavern and characterizing its internal structure through brine injection. The method corresponding to this system can be the same as the method described in the foregoing embodiments, and the principle underlying the problem is similar. The system for calculating the volume of a salt cavern and characterizing its internal structure through brine injection provided in this application includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, which, when executed by the at least one processor, enable the at least one processor to perform the methods and / or technical solutions of the various embodiments of this application described above.
[0110] Another embodiment of this application provides a computer-readable storage medium having computer program instructions stored thereon, which can be executed by a processor to implement the methods and / or technical solutions of any one or more embodiments of this application described above.
[0111] Specifically, this embodiment may employ any combination of one or more computer-readable media. A computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium may be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium may be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus, or device.
[0112] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including—but not limited to—electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, capable of sending, propagating, or transmitting programs for use by or in connection with an instruction execution system, apparatus, or device.
[0113] The program code contained on a computer-readable medium may be transmitted using any suitable medium, including—but not limited to—wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.
[0114] Computer program code for performing the operations of this application can be written in one or more programming languages or a combination thereof, including object-oriented programming languages such as Java, Smalltank, and C++, and conventional procedural programming languages such as "C" or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).
[0115] The flowcharts or block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of devices, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-specific system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.
[0116] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.
[0117] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods 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 page 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 an indirect coupling or communication connection between devices or units through some interfaces, and may be electrical, mechanical, or other forms.
[0118] 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.
[0119] 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 in a combination of hardware and software functional units.
[0120] The integrated units implemented as software functional units described above can be stored in a computer-readable storage medium. These software functional units, stored in a storage medium, include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute some steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.
[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. 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.
[0122] Furthermore, it is clear that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or devices recited in a device claim may also be implemented by a single unit or device through software or hardware. The terms "first," "second," etc., are used to indicate names and do not indicate any specific order.
Claims
1. A method for calculating the volume of salt caverns and characterizing their internal structure by injecting brine, characterized in that, include: Calculate the volume of underground brine based on historical brine extraction data; Based on rock mechanics experiments, the bulk modulus of salt cavern sediment and the bulk modulus of surrounding rock were determined. Determine the bulk modulus of saturated brine; Determine the injection flow rate change value and the wellhead pressure change value; the injection flow rate change value is the flow rate change value of the brine injected into the salt cavern; the wellhead pressure change value is the pressure change value at the wellhead of the salt cavern. The volume of the sediment rock is determined based on the underground brine volume, the bulk modulus of the salt cavern sediment, the bulk modulus of the surrounding rock, the bulk modulus of the saturated brine, the change in the injection flow rate, and the change in the wellhead pressure. The volume of the salt cavern is obtained based on the volume of the underground brine and the volume of the sediment rock. The sediment volume is obtained based on the salt cavern volume and the volume detected by sonar. The porosity of the sediment is obtained based on the volume of the underground brine, the volume detected by sonar, and the volume of the sediment.
2. The method for calculating the volume of salt caverns and characterizing their internal structure by brine injection according to claim 1, characterized in that, The formula for calculating the volume of the underground brine includes: In brine =1.14×V salt ; Among them, V brine =Table 1.1 shows 4 as ×V ground salt Lower halogen V bri water ne = Volume 1. Volume 14; × V salt This represents historical data on brine extraction.
3. The method for calculating the volume of salt caverns and characterizing their internal structure by brine injection according to claim 1 or 2, characterized in that, The formula for calculating the volume of the sediment rock includes: Among them, V brine =Table 1.1 shows 4 as ×V ground salt Lower brine volume; ΔV represents the change in injection flow rate; ΔP represents the change in wellhead pressure; K rock K represents the bulk modulus of salt cavern sediment. s Represented as the bulk modulus of the surrounding rock; K brine V represents the bulk modulus of saturated brine. rock It is expressed as the volume of sediment rock.
4. The method for calculating the volume of salt caverns and characterizing their internal structure by brine injection according to claim 1 or 2, characterized in that, The formula for calculating the volume of the salt cavern include: V C =V brine +V rock ; Among them, V C V represents the volume of the salt cavern. brine =Table 1.1 shows 4 as ×V ground salt Volume of brine; V rock It is expressed as the volume of sediment rock.
5. The method for calculating the volume of salt caverns and characterizing their internal structure by brine injection according to claim 1 or 2, characterized in that, The formula for calculating the volume of sediment include: V dip =V C -V sonar ; Among them, V dip V is expressed as the volume of sediment; C Represented as salt cavern V volume dip Product = V; C -V sonar This represents the volume detected by the sonar.
6. The method for calculating the volume of salt caverns and characterizing their internal structure by brine injection according to claim 1 or 2, characterized in that, The formula for calculating the porosity of the sediment includes: Where ψ represents the porosity of the sediment; V dip V is expressed as the volume of sediment; brine =Table 1.1 shows 4 as ×V ground salt Lower brine V-body dip Product = V; C -V sonar This represents the volume detected by the sonar.
7. The method for calculating the volume of salt caverns and characterizing their internal structure by brine injection according to claim 1 or 2, characterized in that, The formula for calculating the porosity of the sediment includes: Where ψ represents the porosity of the sediment; V rock V represents the volume of sediment rock; dip It is expressed as the volume of sediment.
8. The method for calculating the volume of salt caverns and characterizing their internal structure by brine injection according to claim 1 or 2, characterized in that, The injection flow rate change value is the average flow rate obtained from multiple periodic measurements; the wellhead pressure change value is the average pressure obtained from multiple periodic measurements.
9. A system for calculating the volume of salt caverns and characterizing their internal structure by injecting brine, characterized in that, include: At least one processor; A memory that is communicatively connected to the at least one processor; The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the method of any one of claims 1 to 8.
10. A computer-readable medium having stored thereon computer program instructions that can be executed by a processor to implement the method as described in any one of claims 1 to 8.