A method, apparatus and electronic device for detecting salt cavern connectivity

Abstract

This invention relates to a method, apparatus, and electronic device for detecting salt cavern connectivity. The method includes: setting up a well-to-surface potential detection environment for a first salt cavern and a second salt cavern; acquiring observation information of the first salt cavern under power supply conditions; processing the observation information to obtain potential distribution information around the surface projections of the first and second salt caverns; and determining the connectivity of the first and second salt caverns based on the potential distribution information around the surface projections of the first and second salt caverns. This invention employs a potential detection method, requiring a dedicated downhole charging device and array-type potential acquisition on the surface. After data processing, the connectivity of the salt caverns is determined by delineating them on a contour map. Furthermore, this invention only requires a well-preserved borehole, placing an electrode in the well, and ensuring the electrode is submerged in the brine; all other work is completed on the surface, effectively reducing the impact of unfavorable borehole factors on salt cavern connectivity exploration.

Description

Technical Field

[0001] This invention relates to the field of salt cavern detection technology, and in particular to a method, apparatus and electronic device for detecting salt cavern connectivity. Background Technology

[0002] Salt caverns, formed after rock salt mining, are a valuable underground space resource. my country is rich in salt caverns, most of which are large in volume and well-sealed, making them suitable for storing important strategic materials such as oil and natural gas. They are also ideal locations for building compressed air energy storage power plants. The rational development and utilization of underground salt cavern resources can effectively reduce the occupation of natural space by human activities, improve the intensive use of land resources, enhance my country's strategic energy reserve capacity, explore new paths for green energy storage, and promote changes in energy production and utilization methods. Currently, under the "dual carbon" goals, there is a strong demand for geophysical exploration technologies in areas such as deep clean energy resource exploration, carbon sequestration site selection and utilization. Therefore, conducting investigations and evaluations on the safety of storing high-pressure gases in underground salt caverns is of great significance.

[0003] There are two main methods for constructing salt caverns. One is to redevelop and utilize the salt caverns formed after salt mining, after exploration and evaluation, by modifying them for gas and oil storage. The other is to create salt caverns of a certain volume and shape within the underground salt layer after brine extraction, using a special cavern-building process. Utilizing the goaf (old caverns) formed after salt mining can shorten reservoir construction time, reduce investment, alleviate the problem of brine digestion, eliminate potential hazards such as ground subsidence left by salt mining, and transform abandoned caverns into resources.

[0004] After the salt mine is completed, the old cavities that are not developed and utilized in a timely manner have complex shapes and unclear connections with adjacent boreholes, which makes it difficult to develop and utilize the old cavities. Quickly and accurately obtaining the connectivity of the salt caves is of great practical significance for the development and utilization of the old cavities.

[0005] Currently, the connectivity of single-well convection salt cavities is typically determined by matching the injection volume with the brine output. However, this method cannot determine the connectivity between two target salt cavities. In assessing salt cavity connectivity, referencing oil injection-production well processes, commonly used methods include chemical tracer tracking and pressure gradient methods.

[0006] Tracer detection technology refers to injecting tracers into injection wells, then taking samples from surrounding production wells according to certain sampling regulations, monitoring their production, analyzing the samples, obtaining tracer production curves, and then fitting them to reflect the connectivity between oil and water wells during water injection development.

[0007] Among methods for detecting borehole connectivity, pressure methods typically include in-situ formation pressure methods and interference-like methods. The in-situ formation pressure method involves placing a pressure gauge in the oil well and observing whether the pressure coefficient matches the pressure coefficient characteristics of the same oil and gas reservoir to determine whether the boreholes are connected. When the pressure coefficients are similar, the two boreholes can be considered connected. The interference-like method involves conducting injection and production operations in one borehole while simultaneously observing pressure changes in another borehole to determine inter-well connectivity.

[0008] However, in the chemical reagent tracking method, since old salt caverns typically only have openings at the surface, after adding tracers, it takes a considerable amount of time to monitor the tracer content curves in the borehole to determine the connectivity of the salt cavern. This time usually takes 30 days or even longer. In the pressure method, the fluid in the salt cavern is brine, which has a different impact on well fluid pressure than the same oil reservoir formation. The liquid pressure in the old salt cavern is only the pressure generated by the liquid column at the detection depth, so the in-situ formation pressure method cannot be applied to salt cavern connectivity detection. The interference-like method requires the borehole to meet the injection and production operation conditions, but since there is no water injection and brine production equipment at the wellhead of the old cavern, and considering the aging of the borehole casing and formation conditions, the interference-like method cannot be quickly applied to salt cavern connectivity exploration. Summary of the Invention

[0009] In view of this, it is necessary to provide a salt cave connectivity detection method, device and electronic equipment to solve the technical problems of long detection time or low detection efficiency in the prior art, so as to realize the rapid detection of salt cave connectivity and to economically and effectively determine the connectivity of adjacent caverns.

[0010] To achieve the above objectives, in a first aspect, the present invention provides a method for detecting salt cavern connectivity, comprising the following steps:

[0011] Set up the well-to-ground potential detection environment for the first and second salt chambers, and obtain observation information of the first salt chamber under power supply conditions;

[0012] Data processing of the observation information yields the potential distribution information around the ground projection of the first and second salt cavities;

[0013] The connectivity between the first and second salt cavities is determined based on the potential distribution information around their ground projections.

[0014] In some possible embodiments, the well-to-ground potential detection environment for arranging the first and second salt chambers includes:

[0015] Several electrode survey lines are arranged in parallel on the ground surface above the first and second salt chambers, and all electrode survey lines are connected end to end to connect to the receiver.

[0016] The downhole electrode was placed in the brine of the first salt chamber, and the transmitter was electrically connected to the downhole electrode. The generator was also electrically connected to the transmitter.

[0017] In some possible embodiments, obtaining observation information of the first salt cavity under power supply conditions includes:

[0018] Start the generator to supply power, and periodically acquire the potential signal based on the transmitter, and record the full waveform potential data, observation time, transmission current and transmission time;

[0019] The full waveform potential data, observation time, transmission current, and transmission time are transmitted to the receiver as observation information.

[0020] In some possible embodiments, data processing of the observation information is performed to obtain potential distribution information around the ground projection of the first and second salt cavities, including:

[0021] The average value of the steady segment of the collected full waveform potential data is taken and observed.

[0022] The observed values ​​were normalized using the emission current sequence;

[0023] Draw the potential contour map and the horizontal and vertical potential difference profiles of the survey area.

[0024] In some possible embodiments, determining the connectivity of the first and second salt cavities based on the potential distribution information around their ground projections includes:

[0025] Based on the three-dimensional finite element simulation scheme, the geopotential observation simulation of salt cavity wells with different burial depths and different geometric parameters and connectivity was carried out to determine the relationship between the trap and the connectivity of the salt cavity in the potential contour map.

[0026] The connectivity between the first and second salt cavities was determined based on the relationship between the loop and the salt cavity in the potential contour map.

[0027] In some possible embodiments, the relationship between the loop and the salt cavity in the potential contour map is specifically as follows:

[0028] Within the well-to-surface electric field equipotential lines generated by connected salt cavities, a loop can be formed that surrounds two salt cavities within a limited observation range, while a loop that surrounds only an independent salt cavity can be formed by disconnected salt cavities.

[0029] In a second aspect, the present invention also provides a salt cavern connectivity detection device, comprising:

[0030] The observation information acquisition module is used to set up the well-to-ground potential detection environment of the first salt cavity and the second salt cavity, and to acquire the observation information of the first salt cavity under power supply conditions.

[0031] The potential information determination module is used to process the observation information to obtain the potential distribution information around the ground projection of the first salt cavity and the second salt cavity;

[0032] The connectivity determination module is used to determine the connectivity between the first salt cavity and the second salt cavity based on the potential distribution information around the ground projection of the first salt cavity and the second salt cavity.

[0033] Thirdly, the present invention also provides an electronic device, including a processor and a memory, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, it implements the salt cave connectivity detection method of any of the above embodiments.

[0034] Fourthly, the present invention also provides a salt cavern connectivity detection system, comprising: a ground electrode string, a power supply device, and a receiver, wherein the power supply device includes a downhole electrode, a transmitter, and a generator;

[0035] The downhole electrode is connected in series with the surface electrode and is used to immerse itself in the brine of the first salt cavern to supply current.

[0036] The power supply equipment is electrically connected to the downhole electrodes to obtain observation information of the first salt cavity under power supply conditions;

[0037] The receiver is connected in series with the ground electrode to receive observation information and process the observation information to obtain the potential distribution information around the ground projections of the first and second salt cavities; the connectivity of the first and second salt cavities is determined based on the potential distribution information around the ground projections of the first and second salt cavities.

[0038] Compared with the prior art, the beneficial effects of the present invention include: the present invention adopts the potential detection method, that is, only one set of in-well power supply system and ground acquisition device are needed to collect potential information, and after data processing, the connectivity of salt cavity is determined by delineation in contour map.

[0039] Furthermore, the technical effects also include:

[0040] 1) Significantly improved work efficiency: Compared with the disadvantage that chemical tracer observation methods usually require a period of more than 30 days, the observation method described in this invention can complete the data acquisition and processing of a pair of salt chambers within 2-3 days.

[0041] 2) No need for salt cavity wellhead equipment: The pressure method requires drilling equipment that remains at the wellhead, while salt cavities typically do not have this capability. Compared to the pressure method, this invention does not require wellhead equipment; the downhole equipment consists of only one set of dedicated downhole electrodes, and all other work is carried out on the surface.

[0042] 3) Lower requirements for the preservation status of boreholes in salt cavities: In salt cavity connectivity exploration, the chemical tracer method requires placing a tracer in salt cavity A and collecting fluid samples from salt cavity B at regular intervals for analysis. This method requires both boreholes to be well-preserved to successfully deploy the tracer and collect fluid samples. If one borehole casing is severely corroded, causing serious blockage, this method cannot be effectively implemented. This invention, however, only requires one well-preserved borehole to place the in-well electrode, with the electrode submerged in the brine. All other work is completed on the surface, effectively reducing the impact of unfavorable borehole conditions on salt cavity connectivity exploration. Attached Figure Description

[0043] Figure 1 This is a flowchart illustrating an embodiment of the salt cavern connectivity detection method provided by the present invention.

[0044] Figure 2 A schematic diagram of an embodiment of the salt cavity well geopotential detection device provided by the present invention;

[0045] Figure 3 A schematic diagram of a structure of an embodiment of the salt cavity charging-surface observation potential contour line provided by the present invention;

[0046] Figure 4 A schematic diagram of the structure of an embodiment of the salt cavity charging-surface observation potential contour line at a burial depth of 700m provided by the present invention;

[0047] Figure 5 A schematic diagram of the structure of an embodiment of the salt cavity charging-surface observation potential contour line at a burial depth of 400m provided by the present invention;

[0048] Figure 6 A schematic diagram of a structural embodiment of the salt cavity charging-surface observation potential contour line with a salt cavity spacing of 200m provided by the present invention;

[0049] Figure 7 A schematic diagram of another embodiment of the salt cavity charging-surface observation potential contour line provided by the present invention;

[0050] Figure 8 A schematic diagram of an embodiment of the salt cave connectivity detection device provided by the present invention;

[0051] Figure 9 A schematic diagram of the structure of an embodiment of the electronic device provided by the present invention;

[0052] Figure 10 This is a schematic diagram of an embodiment of the salt cave connectivity detection system provided by the present invention. Detailed Implementation

[0053] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0054] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0055] This invention involves placing a power supply device in the brine above or within a salt cavity and supplying it with a voltage of appropriate intensity. The electric field is then measured on the ground near the projection of the salt cavity onto the surface. The electric field response characteristics are used to determine whether adjacent salt cavities are connected. The detailed description is as follows:

[0056] This invention provides a method for detecting salt cavern connectivity, such as... Figure 1 As shown, the method includes the following steps:

[0057] S101. Arrange the well-to-ground potential detection environment for the first and second salt chambers, and obtain the observation information of the first salt chamber under power supply conditions;

[0058] S102. Data processing is performed on the observation information to obtain the potential distribution information of the first salt cavity and the second salt cavity around the ground projection;

[0059] S103. Determine the connectivity between the first salt cavity and the second salt cavity based on the potential distribution information around the ground projection of the first salt cavity and the second salt cavity.

[0060] Compared with existing technologies, this invention uses the potential detection method, which only requires one downhole power supply system to collect potential distribution information and, after data processing, determines the connectivity of salt cavities by delineating them on contour maps. Moreover, this invention only requires a well-preserved borehole to place the electrode in the well and to have the electrode enter the brine. All other work is completed on the surface, effectively reducing the impact of unfavorable borehole factors on the exploration of salt cavity connectivity.

[0061] In some possible embodiments, the well-to-ground potential detection environment for arranging the first and second salt chambers includes:

[0062] Several electrode survey lines are arranged in parallel on the ground surface above the first and second salt chambers, and all electrode survey lines are connected end to end to connect to the receiver.

[0063] The downhole electrode is placed in the brine of the first salt chamber, and the transmitter is electrically connected to the downhole electrode. The generator is also electrically connected to the transmitter.

[0064] For specific embodiments, please refer to Figure 2 The potential information of salt cavity A (i.e., the first salt cavity) is measured using dedicated electrodes and collected based on ground-based electrode survey lines and receivers. Similarly, the potential information of salt cavity B (i.e., the second salt cavity) is measured using motor survey lines, and then...

[0065] The connectivity of the salt cavities is determined by the connection between the potential information of salt cavity A and the potential information of salt cavity B on the contour lines.

[0066] In some possible embodiments, obtaining observation information of the first salt cavity under power supply conditions includes:

[0067] Start the generator to supply power, and periodically acquire the potential signal based on the transmitter, and record the full waveform potential data, observation time, transmission current and transmission time;

[0068] 5. The full waveform potential data, observation time, transmission current and transmission time are transmitted to the receiver as observation information.

[0069] In some possible embodiments, data processing of the observation information is performed to obtain potential distribution information around the ground projection of the first and second salt cavities, including:

[0070] The average value of the steady segment of the collected full waveform potential data is taken and observed.

[0071] 0. The observed values ​​were normalized using the emission current sequence;

[0072] Draw the potential contour map and the horizontal and vertical potential difference profiles of the survey area.

[0073] In some possible embodiments, determining the connectivity of the first and second salt cavities based on the potential distribution information around their ground projections includes:

[0074] Power is supplied in the first salt cavity to form the potential distribution information around the ground projection of the first and second salt cavities. Then, based on the three-dimensional finite element simulation scheme, the ground potential observation simulation of salt cavity wells with different burial depths and different geometric parameters and the connection status is carried out to determine the relationship between the trap and the connection of the salt cavity in the potential contour map.

[0075] The connectivity between the first and second salt cavities was determined based on the relationship between the loop and the salt cavity in the potential contour map.

[0076] In some possible embodiments, the relationship between the loop and the salt cavity in the potential contour map is as follows:

[0077] Within the well-to-surface electric field equipotential lines generated by connected salt cavities, a loop can be formed that surrounds two salt cavities within a limited observation range, while a loop that surrounds only an independent salt cavity can be formed by disconnected salt cavities.

[0078] In specific embodiments, in order to clarify the feasibility of the present invention, a large number of three-dimensional finite element simulations of salt cavity well-ground exploration methods were carried out based on the typical salt mine sedimentary characteristics and salt cavity parameters in my country (i.e., three-dimensional finite element simulation scheme).

[0079] Generally, salt cavity models are designed based on deep lateral resistivity logging data obtained from boreholes and collected physical property data, according to the formation conditions and physical property statistics of salt mines. Specifically, from the surface to the salt cavity (i.e., from top to bottom in terms of depth), the layers are: surface, interbedded sandstone and mudstone, mudstone, and halite layer (including salt cavities and channels). This invention measures the potential distribution information of the salt cavity and other rock layers by studying the resistivity of different rock layers from the surface to the salt cavity.

[0080] In a specific embodiment, the resistivity of the interbedded sandstone and mudstone is 30 Ω·m, the resistivity of the mudstone top plate is 10 Ω·m, the resistivity of the salt rock is 200 Ω·m, and the resistivity of the brine is 0.01 Ω·m. The brine is generally found in salt caverns.

[0081] In progress Figure 3-7 Before explaining, let's clarify the parameters in the diagram: Y(m) represents the width of the salt cave, i.e., the width at the same depth; X(m) is the length of the salt cave extension, i.e., the distance between different salt caves at the same depth (such as the distance between salt cave A and salt cave B); C1 represents the connected region of salt cave A, C2 represents the connected region of salt cave B, and C merge represents the region after salt cave A and salt cave B are connected.

[0082] Furthermore, regarding the dissolution status of salt cavities, well-ground potential simulations were conducted for dissolution channels and connectivity at different burial depths and with different geometric parameters. For details, please refer to [link to relevant documentation]. Figure 3 , Figure 3 This is a schematic diagram of a structure of an embodiment of the salt cavity charging-surface observation potential contour line provided by the present invention.

[0083] Among them, 3a indicates that the salt cavity has not been dissolved and expanded; 3b indicates that the wide channel of the salt cavity has been dissolved and not connected; 3c indicates that the wide channel of the salt cavity has been dissolved and connected; 3d indicates that the narrow channel of the salt cavity has been dissolved and not connected; and 3e indicates that the narrow channel of the salt cavity has been dissolved and connected.

[0084] Depend on Figure 3 As can be seen above, if charging is chosen in salt cavity A, the potential distribution observed on the ground will be as follows. Figure 3As can be seen from 3a, when the salt cavity has not been dissolved, the ground potential contour lines (equipotential lines) form an equipotential coil closed around the charging salt cavity. Above the salt cavity B, a closed loop is also formed, but the loop is not centered on the salt cavity B, but is closer to the charging salt cavity A.

[0085] When the width of the connected area is large (i.e., a wide dissolution channel), as shown in 3b, the low-resistivity bodies formed by the two salt cavities are independent. In the case where no equipotential lines simultaneously surround the two salt cavities on the surface, and the salt cavities are not connected during dissolution, the salt cavities dissolve towards each other, with the midpoints of the channels 5m apart, and they are not connected. As shown in 3c, the morphology of the surface equipotential lines is similar to... Figure 3 The basic structure is the same, and the potential contour lines form independent loops above the two salt cavities. There is no equipotential coil loop that simultaneously surrounds the two salt cavities.

[0086] When the width of the connected region is small (i.e., a narrow dissolution channel), it can be seen from 3d that the low-resistivity bodies formed by the two salt cavities are also independent. In the case where no equipotential lines simultaneously surround the two salt cavities on the surface, and the salt cavities are not connected during dissolution, the salt cavities dissolve towards each other, and the midpoints of the channels are a certain distance apart, thus they are not connected. It can be seen from 3e that the morphology of the surface equipotential lines is similar to... Figure 3 The basic structure is the same, and the potential contour lines form independent loops above the two salt cavities. There is no equipotential coil loop that simultaneously surrounds the two salt cavities.

[0087] It is understandable that, as can be seen from the contour maps in 3b-3e, when charging in salt cavity A, the ground electric field observation results of the wide dissolution channel and narrow dissolution channel models are almost the same, both having the following characteristics: connected boreholes can form a trap that simultaneously surrounds two salt cavities, but the reverse is not true.

[0088] To simulate and determine the relationship between burial depth and potential information under different burial depths, this invention conducts research through potential information measurements at different burial depths. For details, please refer to [link / reference needed]. Figure 4-5 , Figure 4 A schematic diagram of the structure of an embodiment of the salt cavity charging-surface observation potential contour line at a burial depth of 700m provided by the present invention; Figure 5 This is a schematic diagram of a structural embodiment of the salt cavity charging-surface observation potential contour line at a burial depth of 400m provided by the present invention.

[0089] Among them, 4a is a salt cavity at a depth of 700m that has not been dissolved and expanded; 4b is a wide channel in a salt cavity at a depth of 700m that has been dissolved and not connected; 4c is a wide channel in a salt cavity at a depth of 700m that has been dissolved and connected; 5a is a salt cavity at a depth of 400m that has not been dissolved and expanded; 5b is a narrow channel in a salt cavity at a depth of 400m that has been dissolved and not connected; and 5c is a narrow channel in a salt cavity at a depth of 400m that has been dissolved and connected.

[0090] Specifically, considering that the optimal development depth of salt cavities formed in domestic salt mines is 400-1000m, numerical simulations were conducted on the charging method in salt cavity wells at different depths. Therefore, a depth of h was selected. b = 400m / 700m, if the designed salt chamber size d x =40m,d y =26m,h c =70m. The spacing between salt chambers l = 100m / 200m, the width of the connecting channels between salt chambers is 26m (wide channel) and 2m (narrow channel), and the height of the connecting channels between salt chambers is 2m (thin channel) and 16m (thick channel).

[0091] from Figure 4-5 It can be seen that the potential morphology measured on the ground by the 700m deep salt cavity well ground potential observation method is the same as the simulation result of the 400m deep salt cavity well ground potential observation method. The ground potential contour morphology of the dissolution connected salt cavity and the non-connected salt cavity is significantly different, which has the basis for judging connectivity by traps mentioned above.

[0092] To find the relationship between salt cavern distance and salt cavity connectivity, please refer to [link to relevant documentation]. Figure 6 , Figure 6 This is a schematic diagram of an embodiment of the salt cavity charging-surface observation potential contour line provided by the present invention with a salt cavity spacing of 200m.

[0093] Among them, 6a is a connected salt cavity; 6b is a salt cavity where the dissolution channel is interrupted.

[0094] Depend on Figure 6 It can be seen that in the salt cavity well geopotential detection method, the distance of the salt cavity has no effect on the judgment of the salt cavity connectivity.

[0095] Considering the high probability of dissolution and interconnection in the lower part of the salt cavity, simulations were conducted for salt cavities with greater height and for salt cavity dissolution channels containing mudstone. Please refer to [link / reference needed] for details. Figure 7 , Figure 7 This is a schematic diagram of another embodiment of the salt cavity charging-surface observation potential contour line provided by the present invention.

[0096] Among them, 7a is a 16m high unconnected salt cavity channel; 7b is an unconnected salt cavity channel interbedded with mudstone;

[0097] 7c is a 16m high connecting salt cavity passage; 7d is a mudstone-interbedded connecting salt cavity passage.

[0098] The results show that the geopotential observation results of salt cavity wells in salt cavity channels with larger thickness and those interbedded with mudstone still have the basis for judging the connectivity of salt cavity 5 by observing the traps passing through two boreholes at the same time.

[0099] In summary, the well-to-surface electric field equipotential lines generated by connected salt cavities can form a closed loop surrounding two salt cavities within a limited observation range, while non-connected salt cavities can only form a closed loop surrounding an independent salt cavity. Therefore, it is possible to... Figure 1 The method shown is a geopotential detection method for salt cavity wells, used to investigate the connectivity of old salt cavity cavities.

[0100] It should be noted that the following points need to be considered in the practical application of the salt cavity well geopotential detection method.

[0101] 1) Considering that the mudstone overlying the salt cavity is thick and the resistivity of the Quaternary system is low, resulting in low ground observation potential values, which are only a few millivolts, this will lead to a low signal-to-noise ratio in the observation.

[0102] 2) The measurement area where the old salt cavity is located usually has strong human interference. The observation device should have the function of receiving and receiving full waveforms to avoid the instantaneous observation error in the observation results of traditional observation methods.

[0103] 3) In order to reduce the time spent on the ground, it is necessary to use a receiving instrument with multi-channel full waveform recording.

[0104] Therefore, the salt cavity well geopotential detection method requires the use of high-power in-well multi-channel full-waveform electrical resistivity tomography equipment in order to complete the detection task efficiently and with high quality.

[0105] To better implement the salt cave connectivity detection method in this embodiment of the invention, based on the salt cave connectivity detection method, correspondingly, as follows: Figure 8 As shown, this embodiment of the invention also provides a salt cave connectivity detection device 800, comprising:

[0106] The observation information acquisition module 801 is used to set up the well-to-ground potential detection environment of the first salt cavity and the second salt cavity, and to acquire the observation information of the first salt cavity under power supply conditions.

[0107] The potential information determination module 802 is used to process the observation information to obtain the potential distribution information around the ground projection of the first salt cavity 5 and the second salt cavity;

[0108] The connectivity determination module 803 is used to determine the connectivity between the first salt cavity and the second salt cavity based on the potential distribution information around the ground projection of the first salt cavity and the second salt cavity.

[0109] It should be noted that the salt cave connectivity detection device 800 provided in the above embodiments can realize the technical solutions described in the above method embodiments. The specific implementation principles of the above modules or units can be found in the corresponding content in the above method embodiments, and will not be repeated here.

[0110] like Figure 9As shown, based on the above-described salt cavern connectivity detection method, the present invention also provides an electronic device 900. The electronic device 900 includes a processor 901, a memory 902, and a display 903. Figure 5 Only some components of the electronic device 900 are shown, but it should be understood that it is not required to implement all of the components shown, and more or fewer components may be implemented instead.

[0111] In some embodiments, memory 902 may be an internal storage unit of electronic device 900, such as a hard disk or memory of electronic device 900. In other embodiments, memory 902 may also be an external storage device of electronic device 900, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc. equipped on electronic device 900.

[0112] Furthermore, the memory 902 may include both internal storage units of the electronic device 900 and external storage devices. The memory 902 is used to store application software and various types of data installed on the electronic device 900.

[0113] In some embodiments, processor 901 may be a central processing unit (CPU), microprocessor, or other data processing chip, used to run program code stored in memory 902 or process data, such as the salt cave connectivity detection method of the present invention.

[0114] In some embodiments, display 903 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, or an OLED (Organic Light-Emitting Diode) touchscreen. Display 903 is used to display information from electronic device 900 and to display a visual user interface. Components 901-903 of electronic device 900 communicate with each other via a system bus.

[0115] In one embodiment, when processor 901 executes salt hole connectivity detection program 903 in memory 902, the following steps can be performed:

[0116] Set up the well-to-ground potential detection environment for the first and second salt chambers, and obtain observation information of the first salt chamber under power supply conditions;

[0117] Data processing of the observation information yields the potential distribution information around the ground projections of the first and second salt cavities;

[0118] The connectivity between the first and second salt cavities is determined based on the potential distribution information around their ground projections.

[0119] It should be understood that when the processor 902 executes the salt hole connectivity detection program 903 in the memory 901, in addition to the functions mentioned above, it can also perform other functions, as can be found in the description of the corresponding method embodiments above.

[0120] Furthermore, this embodiment of the invention does not specifically limit the type of electronic device 900 mentioned. Electronic device 900 can be a mobile phone, tablet computer, personal digital assistant (PDA), wearable device, laptop computer, or other portable electronic device. Exemplary embodiments of portable electronic devices include, but are not limited to, portable electronic devices running iOS, Android, Microsoft, or other operating systems. The aforementioned portable electronic device can also be other portable electronic devices, such as a laptop computer with a touch-sensitive surface (e.g., a touch panel). It should also be understood that in some other embodiments of the invention, electronic device 900 may not be a portable electronic device, but rather a desktop computer with a touch-sensitive surface (e.g., a touch panel).

[0121] This invention provides a computer-readable storage medium storing a computer program thereon. When the computer processor executes the program, it implements the salt cave connectivity detection method as described in the above embodiments.

[0122] Please refer to Figure 10 , Figure 10 This is a schematic diagram of an embodiment of the salt cave connectivity detection system provided by the present invention. The salt cave connectivity detection system includes: a ground electrode string, a power supply device, and a receiver. The power supply device includes a downhole electrode, a transmitter, and a generator.

[0123] The downhole electrode is connected in series with the surface electrode and is used to penetrate the brine in the first salt cavern to detect potential information;

[0124] The power supply equipment is electrically connected to the downhole electrodes to obtain observation information of the first salt cavity under power supply conditions;

[0125] The receiver is connected in series with the ground electrode to receive observation information and process the observation information to obtain the potential distribution information around the ground projections of the first and second salt cavities; the connectivity of the first and second salt cavities is determined based on the potential distribution information around the ground projections of the first and second salt cavities.

[0126] To clearly illustrate how the salt cavern connectivity detection system performs rapid detection of salt cavern connectivity, a specific case study will be used to demonstrate this.

[0127] This salt cavern connectivity detection system includes an in-well power supply system and a surface receiving system. The in-well power supply system includes a generator, a transmitter, and downhole electrodes; the surface receiving system includes a multichannel receiver, a string of surface electrodes, and electrodes.

[0128] 1. The observation process for the geopotential detection method in salt cavity wells is as follows:

[0129] a. Arrange electrode survey lines (line0) on the surface projection of salt cavity A and salt cavity B. The electrode spacing depends on the burial depth and spacing of the salt cavity, usually 10-40m.

[0130] b. At both ends of line 0, arrange 4-6 survey lines parallel to line 0, with a survey line spacing of 20-60m;

[0131] c. Connect the ends of the survey line and connect it to the multi-channel receiver, such as... Figure 10 As shown;

[0132] d. Connect the downhole special electrode to the transmitter and place it in salt chamber A. Observe the grounding resistance to determine whether the electrode has entered the brine.

[0133] e. Connect the transmitter to the power generation equipment for power supply, collect data for 1 minute at a time, and observe 3-5 times;

[0134] f. Power supply, and simultaneously record the potential and observation time, and the emission current and emission time;

[0135] g. After observation is complete, power is turned off, and the data is transferred and saved.

[0136] 2. Data processing procedure for the geopotential detection method in salt wells:

[0137] a. Take the average value of the stationary segment from the collected full waveform potential data as the observation value;

[0138] b. Normalize the potential data using the emission current sequence;

[0139] c. Draw the potential contour map and the horizontal and vertical potential difference profiles of the survey area;

[0140] d. Determine the connectivity of salt cavities by enclosing them in the contour map.

[0141] It should be noted that, in order to improve detection efficiency and save detection time, a multi-channel full-waveform data receiver is used. A single receiver can simultaneously acquire 48 channels of full-waveform potential data. Taking 24 measuring points per survey line and 7 survey lines required for a pair of boreholes as an example, generally speaking, power supply takes one day, setting up 48 survey lines takes 30 minutes, and acquiring data from each of the 48 channels takes 10 minutes. Therefore, completing data acquisition for the survey area takes approximately 1.5 days. Data processing takes one day. Therefore, completing the task of determining the salt cavity connectivity of a pair of boreholes takes approximately 2-3 days.

[0142] The salt cavern connectivity detection method, device, and electronic equipment provided by this invention have the following technical effects: the potential detection method is adopted, that is, only one set of in-well power supply equipment and ground receiving equipment are needed to collect potential information, and after data processing, the connectivity of the salt cavern is determined by delineation in the contour map.

[0143] Furthermore, the technical effects also include:

[0144] 1) Significantly improved work efficiency: Chemical tracer observation methods typically require multiple data collections over a period of more than 30 days to determine the connectivity of salt cavities. However, using the observation method described in this invention, the data acquisition and processing of a pair of salt cavities can be completed within 2-3 days.

[0145] 2) No need for salt cavity wellhead equipment: The pressure method requires drilling equipment to remain at the wellhead, which is usually not the case in old salt cavities. Compared to the pressure method, this method does not require wellhead equipment. The downhole equipment consists of only one set of downhole-specific electrodes with a diameter of approximately 50 mm, and all other work is carried out on the surface.

[0146] 3) Lower requirements for the preservation status of boreholes in salt cavities: In salt cavity connectivity exploration, the chemical tracer method requires placing a tracer in salt cavity A and collecting fluid samples from salt cavity B at regular intervals for analysis. This method requires both boreholes to be well-preserved to successfully deploy the tracer and collect fluid samples. If one borehole casing is severely corroded, causing serious blockage, this method cannot be effectively implemented. This invention, however, only requires one well-preserved borehole to place the in-well electrode, with the electrode submerged in the brine. All other work is completed on the surface, effectively reducing the impact of unfavorable borehole conditions on salt cavity connectivity exploration.

[0147] Those skilled in the art will understand that all or part of the processes of the methods described in the above embodiments can be implemented by a computer program instructing related hardware, and the program can be stored in a computer-readable storage medium. The computer-readable storage medium may be a disk, optical disk, read-only memory, or random access memory, etc.

[0148] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method of salt cavern connectivity detection, the method comprising: The method comprises the following steps: arranging a well-ground potential detection environment of the first salt cavity and the second salt cavity, and obtaining observation information of the first salt cavity under power supply conditions; performing data processing on the observation information to obtain potential distribution information around the ground projection of the first salt cavity and the second salt cavity; determining the connectivity of the first salt cavity and the second salt cavity based on the potential distribution information around the ground projection of the first salt cavity and the second salt cavity, comprising: performing salt cavity well-ground potential observation simulation of different buried depths and different geometric parameter dissolution channels and connectivity conditions based on a three-dimensional finite element simulation scheme, determining the relationship between traps and salt cavities in the potential contour map, and determining the connectivity to the first salt cavity and the second salt cavity based on the relationship between the traps and the salt cavities in the potential contour map; the relationship between the traps and the salt cavities in the potential contour map is that, in the well-ground potential field equipotential line generated by the connected salt cavities, a trap can be formed to surround two salt cavities within a limited observation range, and the unconnected salt cavities only surround independent salt cavities; arranging a well-ground potential detection environment of the first salt cavity and the second salt cavity, comprising: arranging a plurality of electrode measuring lines on the ground surface above the first salt cavity and the second salt cavity in parallel, and connecting all the electrode measuring lines in a loop to connect a receiver; placing a downhole electrode in the brine of the first salt cavity, electrically connecting a transmitter with the downhole electrode, and electrically connecting a generator with the transmitter.

2. The salt cavern connectivity detection method of claim 1, wherein, obtaining observation information of the first salt cavity under power supply conditions, comprising: starting the generator to supply power, periodically collecting potential signals based on the transmitter, and recording full-wave potential data, observation time, transmission current and transmission time; transmitting the full-wave potential data, observation time, transmission current and transmission time to the receiver as observation information.

3. The salt cavern connectivity detection method of claim 2, wherein, performing data processing on the observation information to obtain potential distribution information around the ground projection of the first salt cavity and the second salt cavity, comprising: taking the average value of the collected full-wave potential data to obtain observation values in a smooth section; normalizing the observation values with the transmission current sequence; drawing a potential contour map of the survey area and a horizontal and vertical potential difference profile.

4. A salt cavern connectivity probe apparatus, comprising: The method comprises the following steps: an observation information acquisition module for arranging a well-ground potential detection environment of the first salt cavity and the second salt cavity, and obtaining observation information of the first salt cavity under power supply conditions; a potential information determination module for performing data processing on the observation information to obtain potential distribution information around the ground projection of the first salt cavity and the second salt cavity; a connectivity determination module for determining the connectivity of the first salt cavity and the second salt cavity based on the potential distribution information around the ground projection of the first salt cavity and the second salt cavity, comprising: performing salt cavity well-ground potential observation simulation of different buried depths and different geometric parameter dissolution channels and connectivity conditions based on a three-dimensional finite element simulation scheme, determining the relationship between traps and salt cavities in the potential contour map, and determining the connectivity to the first salt cavity and the second salt cavity based on the relationship between the traps and the salt cavities in the potential contour map; the relationship between the traps and the salt cavities in the potential contour map is that, in the well-ground potential field equipotential line generated by the connected salt cavities, a trap can be formed to surround two salt cavities within a limited observation range, and the unconnected salt cavities only surround independent salt cavities; arranging a well-ground potential detection environment of the first salt cavity and the second salt cavity, comprising: A plurality of electrode measuring lines are arranged in parallel on the ground surface above the first salt cavity and the second salt cavity, and all the electrode measuring lines are connected in series and connected to a receiver; The downhole electrode is placed in the brine of the first salt cavity, a transmitter is electrically connected to the downhole electrode, and a generator is electrically connected to the transmitter.

5. An electronic device, comprising: The method comprises a processor and a memory, and the memory stores a computer program which is executed by the processor to implement the salt cavity connectivity detection method according to any one of claims 1-3.

6. A salt cavern connectivity detection system, comprising: The method comprises: The ground electrode string, the power supply device, and the receiver, wherein the power supply device comprises a downhole electrode, a transmitter, and a generator; The downhole electrode is electrically connected to the ground electrode string, and is used to intrude into the brine of the first salt cavity to supply current; The power supply device is electrically connected to the downhole electrode, and is used to obtain observation information of the first salt cavity under the power supply condition; The receiver is electrically connected to the ground electrode string, and is used to receive the observation information and perform data processing on the observation information to obtain potential distribution information around the ground projection of the first salt cavity and the second salt cavity; The connectivity of the first salt cavity and the second salt cavity is determined based on the potential distribution information around the ground projection of the first salt cavity and the second salt cavity, which comprises: performing salt cavity well-ground potential observation simulation of different buried depths and different geometric parameter dissolution channels and connectivity conditions based on a three-dimensional finite element simulation scheme, determining the relationship between traps and salt cavities in the potential contour map, determining the connectivity to the first salt cavity and the second salt cavity based on the relationship between traps and salt cavities in the potential contour map, and the relationship between traps and salt cavities in the potential contour map is that, in the well-ground electric field equipotential line generated by the connected salt cavities, a trap can be formed to surround two salt cavities within a limited observation range, and the independent salt cavities only surround a trap of the independent salt cavity; The well-ground potential detection environment of the first salt cavity and the second salt cavity is arranged, which comprises: A plurality of electrode measuring lines are arranged in parallel on the ground surface above the first salt cavity and the second salt cavity, and all the electrode measuring lines are connected in series and connected to a receiver; The downhole electrode is placed in the brine of the first salt cavity, a transmitter is electrically connected to the downhole electrode, and a generator is electrically connected to the transmitter.

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