Efficient cavity detection device and detection method for salt cavern horizontal storage cavern

Abstract

The invention discloses a salt cavern horizontal reservoir efficient cavity detection device and a detection method, and belongs to the technical field of underground environment detection. The cavity measuring device comprises a cavity making pipe and a crawling cavity measuring robot, wherein the cavity making pipe is lowered into a salt rock layer along a shaft. The crawling cavity detection robot crawl to the tail end of the cavity construction pipe along the top end of the cavity construction pipe and returns to the top end to perform multi-angle rotation detection; the crawling cavity measuring robot comprises an adsorption moving module, a fluid sound velocity measuring module and a horizontal and inclined rotating distance measuring module; the adsorption moving module is used for controlling crawling and multi-angle rotation to detect the real-time form of the dissolving cavity in the storage cavern building process, the problems that an existing detection method is short in salt cavern horizontal storage cavern detection distance, small in cavity detection range, low in cavity detection precision and difficult in detection equipment recovery are solved, synchronization of horizontal storage cavern building and cavity detection is achieved, and the detection efficiency is improved. The cavity measuring range is expanded, and the cavity measuring efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of underground environment detection technology, and relates to the detection of horizontal cavities in underground salt caverns, specifically a high-efficiency cavity detection device and method for horizontal salt cavern storage. Background Technology

[0002] To address humanity's energy needs, my country is vigorously promoting the industrialization of energy storage technologies such as underground hydrogen storage, compressed air energy storage, and natural gas storage. Underground salt cavern storage has become the preferred choice due to its outstanding advantages, including strong sealing, high injection and extraction efficiency, high flexibility, and excellent safety performance. Currently, storage caverns constructed using the retreat-type solution extraction method have larger solution chambers, with horizontal sections reaching hundreds to thousands of meters in length, more regular shapes, and better stability.

[0003] Existing cavity measurement technologies are mainly designed for vertical and horizontal reservoirs with a maximum horizontal section distance of about 100 meters. They are ill-suited for measuring horizontal reservoirs with horizontal sections reaching hundreds to thousands of meters, severely limiting the widespread application of receding horizontal reservoirs in engineering projects and posing significant challenges to the efficient construction and utilization of reservoirs. Furthermore, most existing horizontal reservoir cavity measurement technologies rely on sonar detection, requiring equipment to be lowered into the well via cable after reservoir construction. This not only makes equipment retrieval difficult and prevents real-time acquisition of cavity morphology, but also fails to integrate horizontal reservoir construction and detection, resulting in low measurement efficiency. Moreover, the real-time changes in fluid within the cavity during construction make it impossible to provide accurate sound velocity data, leading to significant testing errors and low measurement accuracy. Summary of the Invention

[0004] This invention overcomes the shortcomings of the prior art by proposing a highly efficient cavity measuring device and detection method for horizontal salt cavern storage, thereby solving the aforementioned problems.

[0005] This invention is achieved through the following technical solution:

[0006] A high-efficiency cavity detection device for a horizontal salt cavern reservoir includes a cavity-forming tube lowered into the salt rock layer along the wellbore, and a crawling cavity detection robot. The crawling cavity detection robot crawls from the top of the cavity-forming tube to the bottom and back to the top, performing multi-angle rotational detection. The crawling cavity detection robot includes an adsorption and movement module, a fluid sound velocity measurement module, and a horizontal and tilt rotational ranging module. The adsorption and movement module controls the crawling cavity detection robot to adhere to the cavity-forming tube and crawl back and forth along the tube. The fluid sound velocity measurement module is used to test the temperature, pressure, concentration, and flow rate of the fluid inside the cavity during the construction of the horizontal reservoir in real time. The horizontal and tilt rotational ranging module includes a rotatable sonar probe for transmitting and receiving pulse signals in a vertical plane in the horizontal direction.

[0007] Furthermore, the fluid sound velocity measurement module includes a temperature sensor, a pressure sensor, a concentration sensor, and a flow rate sensor.

[0008] Furthermore, the horizontal and tilt rotation ranging module also includes a rotary motor and an inner rotor hollow shaft motor; the rotary motor is connected to the drive inner rotor hollow shaft motor, and the drive inner rotor hollow shaft motor is connected to the sonar probe; the rotary motor is used to drive the inner rotor hollow shaft motor and the sonar probe as a whole to rotate in the tilt direction by a set angle, with a rotation range of 0 to 90 degrees; the inner rotor hollow shaft motor is used to drive the sonar probe to rotate in the circumferential direction by a set angle, with a rotation range of 0 to 360 degrees.

[0009] Furthermore, the crawling cavity-measuring robot also includes a stabilization module, which is a gyroscope.

[0010] Furthermore, it also includes a ground control system and cables; the crawling cavity robot is connected to the ground control system via cables.

[0011] Furthermore, vertical and inclined wells are drilled from the ground to the salt rock layer, and the well casings are fixed in the vertical and inclined wells. Horizontal wells are drilled along the horizontal direction of the salt rock layer, and the cavity-making pipe is lowered into the horizontal well along the well casing.

[0012] A method for efficient detection of horizontal salt cavern reservoirs, employing the aforementioned efficient cavity detection device for horizontal salt cavern reservoirs, and comprising the following steps:

[0013] S1. Inject fresh water into the cavity-forming pipe and recover brine using the gap between the wellbore and the cavity-forming pipe. When the height of the cavity formed after some of the salt rock in the salt rock layer dissolves reaches the preset height, stop injecting fresh water and recovering brine to ensure that the fluid in the cavity is in equilibrium, i.e., the fluid temperature. ,pressure ,concentration and flow rate Remain unchanged;

[0014] S2. Lower the crawling cavity-exploration robot along the cavity-exploration tube to the end of the cavity-exploration tube, rotate the sonar probe in the tilt and vertical directions, and simultaneously monitor the temperature of the fluid inside the cavity at this moment through the fluid sound velocity measurement module. ,pressure ,concentration and flow rate i = 0, 1, 2, ..., representing the number of rotations; the sound velocity of the fluid inside the cavity is obtained.

[0015] S3. Calculate the distance from the sonar probe to the cavity wall, and reconstruct the shape of the cavity in three dimensions to obtain the shape of the cavity in this case. m represents the number of times the cavity-forming tube retracts to measure the cavity; thus, the shape of the cavity is obtained as follows: n represents the number of times the cavity-forming tube is withdrawn to create a cavity;

[0016] S4. Control the crawling cavity-finding robot to crawl from the end of the cavity-forming tube back to the top; adjust the backward distance of the cavity-forming tube, and repeat steps S1 to S3 until the cavity construction is completed, so as to obtain the real-time morphology of the cavity during the dissolution of the salt rock layer.

[0017] Furthermore, in step S2, a rotary motor is used to control the sonar probe to rotate an angle in the tilt direction. i = 0, 1, 2, ..., represents the number of rotations of the rotary motor; the sonar probe is rotated vertically by an angle controlled by a hollow shaft motor within the inner rotor. j=0,1,2,… represents the number of rotations of the hollow shaft motor in the inner rotor.

[0018] Furthermore, in step S3, the sonar probe transmits and receives pulse signals towards the wall of the cavity, transmits data along the cable, and records the transmission time of the pulse signals through the ground control system. Arrival time Rotation angle of the hollow shaft motor with inner rotor and the rotation angle of the rotary motor Based on the corrected sound velocity of the fluid within the cavity. Pulse signal transmission time Arrival time Calculate the distance from the sonar probe to the cavity wall. ;

[0019] Continue using the hollow shaft motor of the inner rotor to control the sonar probe's vertical rotation, increasing the angle by 15 degrees each time, until a full 360 degrees is reached. Then continue adjusting the rotation motor, increasing the angle by 15 degrees each time, until a 90-degree rotation is achieved. This is based on the distance from the sonar probe to the cavity wall. The rotation angle of the hollow shaft motor in the inner rotor and the rotation angle of the rotary motor The shape of the cavity is obtained by three-dimensional reconstruction. .

[0020] Furthermore, in step S4, the real-time cavity morphology during the dissolution of the salt rock layer is the result of superimposing the cavity morphology obtained each time the rock is moved a certain distance backward. The final cavity shape obtained after the salt rock dissolves is as follows: .

[0021] The beneficial effects of this invention compared to the prior art are as follows:

[0022] This invention utilizes a crawling cavity-probing robot magnetically attached to a cavity-forming tube, rotating and probing at multiple angles. This achieves synchronized construction and exploration of horizontal reservoirs, simplifying the cavity-probing process and improving efficiency. Construction parameters can be adjusted in real-time based on changes in the cavity morphology, optimizing the cavity shape. An adsorption-movement module allows for real-time control of the crawling robot's reciprocating movement, enabling timely retrieval of the probe and preventing it from falling into the cavity due to sudden cable breakage. A fluid sound velocity measurement module corrects for the fluid sound velocity within the cavity during the salt rock dissolution process, improving accuracy. Furthermore, horizontal and tilting rotational ranging modules are employed to probe the cavity morphology during the retraction of the cavity-forming tube, expanding the measurement range to hundreds to thousands of meters across horizontal sections of the reservoir, facilitating rapid construction and exploration of horizontal reservoirs. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the salt cavern horizontal storage tank before construction and the cavity measuring device provided in an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the initial construction stage and the cavity measuring device of the salt cavern horizontal storage tank provided in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the construction process and measuring device of a horizontal salt cavern storage facility provided in an embodiment of the present invention.

[0026] Figure 4 This is a schematic diagram of the structure of the salt cavern horizontal storage tank construction phase and the cavity measuring device provided in an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of the crawling cavity measuring robot provided in an embodiment of the present invention.

[0028] Explanation of icon numbers:

[0029] 1. Wellbore; 2. Cavity-forming tube; 3. Crawling cavity-measuring robot; 4. Surface control system; 5. Cable; 6. Horizontal well; 7. Salt rock layer; 8. Solution cavity; 311. Adsorption moving module; 312. Stabilization module; 313. Fluid sound velocity measurement module; 3131. Temperature sensor; 3132. Pressure sensor; 3133. Concentration sensor; 3134. Flow velocity sensor; 314. Horizontal and tilting rotation distance measuring module; 3141. Rotary motor; 3142. Internal rotor hollow shaft motor; 3143. Sonar probe. Detailed Implementation

[0030] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solutions of this invention are described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0031] See Figures 1 to 5 This embodiment proposes a high-efficiency cavity detection device and method for horizontal salt cavern storage. The cavity detection device includes: a cavity-forming tube 2 in a wellbore 1, a crawling cavity-detecting robot 3, a ground control system 4, and a cable 5. The cavity-forming tube 2 in the wellbore 1 is used for freshwater injection, and the gap between the wellbore 1 and the cavity-forming tube 2 is used for brine recovery. The crawling cavity-detecting robot 3 is magnetically attached to the cavity-forming tube 2 in the wellbore 1 and can crawl along the top of the cavity-forming tube 2 to the end of the cavity-forming tube 2 and return to the top, performing multi-angle rotation detection. The cable 5 connects the crawling cavity-detecting robot 3 for data transmission and power supply. The ground control system 4 controls the movement of the cavity-forming tube 2 and the crawling cavity-detecting robot 3.

[0032] The crawling cavity-testing robot 3 includes an adsorption and movement module 311, a stabilization module 312, a fluid sound velocity measurement module 313, and a horizontal and tilt rotation distance measurement module 314. The diameter of the crawling cavity-testing robot 3 needs to be smaller than the inner diameter of the wellbore 1 so that the crawling cavity-testing robot 3 can reach the horizontal well 6 along the cavity-forming tube 2 and prevent collisions.

[0033] The adsorption and movement module 311 is a magnetic adsorption mechanism used to control the crawling cavity-forming robot 3 to adhere to the cavity-forming tube 2 and crawl back and forth along the cavity-forming tube 2. The adsorption and movement module 311 is an existing mature structure. Specific products and models include: Deep Sea Intelligent Human Magnetic Adsorption Wall-Climbing Walking Mechanism, patent number: CN 222136890 U, whose main frame is equipped with a Heilbeck array permanent magnet adsorption group, which achieves efficient adsorption through the combination of yoke and permanent magnet blocks. The width of the drive wheel group is adjustable to adapt to different pipe diameters. It is equipped with a double permanent magnet adsorption group to enhance stability and adopts a circular tube structure design. Other examples include Boqing Technology's magnetic adsorption crawling robot and Yimaite Technology's pipeline robot system.

[0034] The stabilization module 312 is a gyroscope, used to ensure that the crawling cavity-measuring robot 3 is in a stable state during the cavity measurement process. The fluid sound velocity measurement module 313 consists of a temperature sensor 3131, a pressure sensor 3132, a concentration sensor 3133, and a flow velocity sensor 3134, with two of each type of sensor, used to test the temperature, pressure, concentration, and flow velocity of the fluid in the cavity 8 in real time during the construction of the horizontal storage tank, and to obtain the corrected sound velocity of the fluid in the cavity 8 by calculating the average value. The horizontal and tilt rotation ranging module 314 consists of a rotary motor 3141, an inner rotor hollow shaft motor 3142, and a sonar probe 3143. The rotary motor 3141 drives the inner rotor hollow shaft motor 3142 and the sonar probe 3143 to rotate as a whole in the tilt direction by a set angle, with a rotation range of 0 to 90 degrees. The inner rotor hollow shaft motor 3142 drives the sonar probe 3143 to rotate in the circumferential direction by a set angle, with a rotation range of 0 to 360 degrees. The sonar probe 3143 is used to transmit and receive pulse signals in the vertical plane in the horizontal direction.

[0035] This embodiment also provides a test method based on the above-described apparatus.

[0036] A method for efficient cavity measurement of a horizontal salt cavern reservoir based on the cavity measurement device includes:

[0037] S1, drill vertical and inclined wells from the surface to the salt rock layer 7, fix the wellbore 1 in the vertical and inclined wells, and drill horizontal well 6 along the horizontal direction of the salt rock layer 7 using directional horizontal well drilling technology. The length of horizontal well 6 is 800~1500m. Lower the cavity tube 2 along the wellbore 1 into the horizontal well 6.

[0038] S2, inject fresh water into cavity-forming pipe 2, and recover brine using the gap between wellbore 1 and cavity-forming pipe 2. When the height of the cavity 8 formed after some of the salt rock in salt rock layer 7 dissolves reaches the preset height, stop injecting fresh water and recovering brine to ensure that the fluid in cavity 8 is in equilibrium, i.e., the fluid temperature. ,pressure ,concentration and flow rate Remain unchanged;

[0039] S3, using the adsorption and movement module 311 to control the crawling cavity-finding robot 3 to be adsorbed onto the cavity-making tube 2 at the wellhead, and crawl along the top of the cavity-making tube 2 to the end of the cavity-making tube 2.

[0040] S4, using the rotary motor 3141 in the horizontal and tilt rotation ranging module 314, the inner rotor hollow shaft motor 3142 and the sonar probe 3143 are controlled to rotate as a whole in the tilt direction by an angle. (i=0,1,2,…, representing the number of rotations of the rotary motor 3141);

[0041] S5, using the hollow shaft motor 3142 with an inner rotor to control the rotation angle of the sonar probe 3143 in the vertical direction. (j=0,1,2,…, representing the number of rotations of the hollow shaft motor 3142 in the inner rotor), the stability of the crawling cavity robot 3 is determined by the stabilization module 312, and the temperature of the fluid in the cavity 8 is monitored by multiple sensors in the fluid sound velocity measurement module 313. ,pressure ,concentration and flow rate Calculate the average value of two sensors of the same type to obtain the corrected sound velocity of the fluid in cavity 8. ;

[0042] S6, sonar probe 3143 transmits and receives pulse signals to the wall of cavity 8, transmits data along cable 5, and records the transmission time of pulse signals through ground control system 4. Arrival time Rotation angle of the hollow shaft motor 3142 with inner rotor and the rotation angle of the rotary motor 3141 ;

[0043] S7, based on the corrected sound velocity of the fluid within the cavity 8. Pulse signal transmission time Arrival time Calculate the distance from sonar probe 3143 to the wall of cavity 8. ;

[0044] S8. Continue to use the hollow shaft motor 3142 of the inner rotor to control the sonar probe 3143 to rotate in the vertical direction, increasing by 15 degrees each time. Repeat steps S5 to S7 until the rotation reaches 360 degrees.

[0045] S9, continue adjusting the rotary motor 3141, increasing the angle by 15 degrees each time, repeating steps S4 to S8 until the rotation reaches 90 degrees, based on the distance from the sonar probe 3143 to the wall of the cavity 8. The rotation angle of the hollow shaft motor 3142 with inner rotor and the rotation angle of the rotary motor 3141 By reconstructing the shape of the cavity in three dimensions, the shape of cavity 8 can be obtained. (m represents the number of times the cavity-forming tube 2 is withdrawn for cavity measurement);

[0046] S10, using the ground control system 4, the cavity-forming tube 2 is retracted a certain distance of 5-15m. Steps S4 to S9 are repeated until the shape of the cavity formed after the salt rock dissolves is measured. At this point, the shape of the cavity is: (n represents the number of times the cavity creation tube is withdrawn for cavity creation);

[0047] S11, using the adsorption and movement module 311 to control the crawling cavity measuring robot 3 to crawl from the end of the cavity tube 2 back to the top;

[0048] S12, adjust the backward distance of the cavity-forming tube 2 to the designed distance of 10~30m, repeat steps S2 to S11 until the cavity 8 is constructed, and obtain the real-time cavity morphology during the dissolution of the salt rock layer 7.

[0049] Furthermore, in step S12, the real-time cavity morphology during the dissolution of salt rock layer 7 is the result of superimposing the cavity morphology obtained each time the rock is moved a certain distance backward. The final shape of the cavity 8 obtained after the salt rock dissolves is as follows: .

[0050] The device and its testing methods will be described below through specific implementation schemes.

[0051] Example 1

[0052] like Figure 1 Embodiment 1 of the present invention provides a method for efficient cavity measurement of a horizontal salt cavern reservoir using the aforementioned efficient cavity measurement device, comprising the following steps:

[0053] Step 1: Drill vertical and inclined wells from the surface to the salt rock layer 7. Using directional horizontal well drilling technology, drill a horizontal well 6 along the horizontal direction of the salt rock layer 7. The length of the horizontal well is 800m. Lower the cavity tube 2 into the horizontal well 6.

[0054] Step 2: Inject fresh water into cavity tube 2, and recover brine using the gap between well tube 1 and cavity tube 2. When the height of cavity 8 formed after some salt rock in salt rock layer 7 dissolves reaches 150m, stop injecting fresh water and recovering brine to ensure that the temperature, pressure, concentration and flow rate of the fluid in cavity 8 remain unchanged.

[0055] Step 3: Using the adsorption and movement module 311, the crawling cavity-making robot 3 is adsorbed onto the cavity-making tube 2 at the wellhead and crawls along the top of the cavity-making tube 2 to the end of the cavity-making tube 2.

[0056] Furthermore, in step S3, based on the existing drilling data of the salt cavern horizontal reservoir, the diameter of the crawling cavity measuring robot 3 needs to be less than 244.5mm to prevent collision with the wellbore 1 and damage to the equipment.

[0057] Step 4: Using the rotary motor 3141 in the horizontal and tilt rotation ranging module 314, control the hollow shaft motor 3142 of the inner rotor and the sonar probe 3143 to rotate as a whole in the tilt direction by 0 degrees.

[0058] Step 5: Use the hollow shaft motor 3142 of the inner rotor to control the sonar probe 3143 to rotate 0 degrees in the vertical direction. If the stabilization module 312 determines that the crawling cavity robot 3 remains stable, then use the sensor in the fluid sound velocity measurement module 313 to monitor the temperature, pressure, concentration and flow rate of the fluid in the cavity 8, calculate the average value of two sensors of the same type, and obtain the corrected sound velocity of the fluid in the cavity 8.

[0059] Step 6: The sonar probe 3143 transmits and receives pulse signals to the wall of the cavity 8, transmits data along the cable 5, and records the transmission time, arrival time, rotation angle of the hollow shaft motor 3142 and the rotation angle of the rotary motor 3141 of the pulse signals through the ground control system 4.

[0060] Step 7: Calculate the distance from the sonar probe 3143 to the wall of the cavity 8 based on the corrected sound velocity of the fluid in the cavity 8, the transmission time of the pulse signal, and the arrival time.

[0061] Step 8: Continue to use the hollow shaft motor 3142 of the inner rotor to control the sonar probe 3143 to rotate in the vertical direction, increasing by 15 degrees each time, and repeat steps S5 to S7 until it rotates 360 degrees.

[0062] Step 9: Continue to adjust the rotary motor 3141, increasing the angle by 15 degrees each time. Repeat steps S4 to S8 until the rotation reaches 90 degrees. Based on the distance from the sonar probe 3143 to the wall of the cavity 8, the rotation angle of the hollow shaft motor 3142 of the inner rotor, and the rotation angle of the rotary motor 3141, the shape of the cavity is reconstructed in three dimensions to obtain the current shape of the cavity 8.

[0063] Step 10: Control the cavity-forming tube 2 to retreat 5m each time through the ground control system 4, repeat steps S4 to S9 until the shape of the cavity formed after the salt rock dissolves is measured.

[0064] Step 11: Use the adsorption and movement module 311 to control the crawling cavity-testing robot 3 to crawl from the end of the cavity-forming tube 2 back to the top;

[0065] Step 12: Adjust the retraction distance of the cavity-forming tube 2 to the designed distance of 10m, and repeat steps S2 to S11 until the solution cavity 8 is completed, obtaining the real-time solution cavity morphology during the dissolution of the salt rock layer 7. The final horizontal reservoir has a horizontal section distance of 800m and a height of 150m.

[0066] Furthermore, in step S12, the real-time cavity morphology during the dissolution of the salt rock layer 7 is the result of superimposing the cavity morphology obtained by retreating a certain distance each time.

[0067] Example 2

[0068] This invention, in its second embodiment, employs the aforementioned efficient cavity-measuring device for horizontal salt cavern reservoirs to conduct efficient cavity-measuring methods for horizontal salt cavern reservoirs. This method is used to detect the morphology of a horizontal reservoir with a horizontal section distance of 1000m and a height of 200m, requiring a horizontal well length of 6 of 1000m. The cavity-measuring device and method in this embodiment are the same as in the first embodiment. A crawling cavity-measuring robot 3 with a diameter less than 244.5mm is controlled by an adsorption and movement module 311 to move back and forth from the wellhead to the end of the cavity-forming tube 2. The cavity 8 formed by the initial injection of fresh water reaches a height of 200m. The ground control system 4 controls the cavity-forming tube 2 to retreat 10m each time, adjusting the retreat distance of the cavity-forming tube 2 to the designed distance of 20m, thus completing the real-time detection of the cavity 8's morphology during the construction of the horizontal reservoir.

[0069] Example 3

[0070] This invention, in its third embodiment, employs the aforementioned efficient cavity-measuring device and method for horizontal salt cavern reservoirs to detect the morphology of a horizontal reservoir with a horizontal section distance of 1200m and a height of 250m. The horizontal well 6 is required to be 1200m long. The cavity-measuring device and method in this embodiment are the same as in the first embodiment. A crawling cavity-measuring robot 3 with a diameter less than 244.5mm is controlled by an adsorption-movement module 311 to move back and forth from the wellhead to the end of the cavity-forming tube 2. The cavity 8 formed by the initial injection of fresh water reaches a height of 250m. The ground control system 4 controls the cavity-forming tube 2 to retreat 15m each time, adjusting the retreat distance of the cavity-forming tube 2 to the designed distance of 30m, thus completing the real-time detection of the cavity 8's morphology during the construction of the horizontal reservoir.

[0071] In this invention, "top" refers to the direction closer to the wellhead, and "end" refers to the direction farther away from the wellhead.

[0072] In embodiments one through three above, a magnetic adsorption moving module controls a crawling cavity-measuring robot to adhere to the cavity-forming tube and crawl back and forth from the top to the bottom of the tube. During the retraction of the cavity-forming tube, a fluid sound velocity measurement module monitors the temperature, pressure, concentration, and flow rate of the fluid within the cavity, correcting the sound velocity in real time to improve measurement accuracy. Horizontal and tilting rotation ranging modules detect the cavity morphology in real time during the retraction, achieving synchronization of horizontal reservoir construction and cavity measurement, optimizing cavity morphology, simplifying the measurement process, and improving measurement efficiency. This provides technical support for the rapid construction and detection of horizontal reservoirs. It solves the technical problems of existing horizontal reservoir cavity measurement technologies, such as small measurement range (maximum detection distance of approximately 100 meters in horizontal sections), low measurement efficiency and accuracy, and difficulty in recovering the measurement device. It achieves the technical effects of synchronizing horizontal reservoir construction and cavity measurement, increasing the cavity detection range, improving detection efficiency and accuracy, and effectively recovering the detection device.

[0073] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0074] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency cavity-making device for a horizontal salt cavern reservoir, comprising a cavity-making tube (2) lowered along the wellbore (1) into a salt rock layer (7), characterized in that, It also includes a crawling cavity-testing robot (3); the crawling cavity-testing robot (3) crawls along the top of the cavity-forming tube (2) to the end of the cavity-forming tube (2) and returns to the top, performing multi-angle rotation detection; the crawling cavity-testing robot (3) includes an adsorption and movement module (311), a fluid sound velocity measurement module (313), and a horizontal and tilt rotation distance measurement module (314); the adsorption and movement module (311) is used to control the crawling cavity-testing robot (3) to adsorb onto the cavity-forming tube (2) and crawl back and forth along the cavity-forming tube (2); the fluid sound velocity measurement module (313) is used to test the temperature, pressure, concentration and flow rate of the fluid in the cavity (8) during the construction of the horizontal reservoir in real time; the horizontal and tilt rotation distance measurement module (314) includes a rotatable sonar probe (3143) for transmitting and receiving pulse signals on a vertical plane in the horizontal direction.

2. The high-efficiency cavity measuring device for a horizontal salt cavern storage according to claim 1, characterized in that, The fluid sound velocity measurement module (313) includes a temperature sensor (3131), a pressure sensor (3132), a concentration sensor (3133), and a flow rate sensor (3134).

3. The high-efficiency cavity measuring device for a horizontal salt cavern storage according to claim 1, characterized in that, The horizontal and tilt rotation ranging module (314) further includes a rotary motor (3141) and an inner rotor hollow shaft motor (3142); the rotary motor (3141) is connected to the inner rotor hollow shaft motor (3142), and the inner rotor hollow shaft motor (3142) is connected to the sonar probe (3143); the rotary motor (3141) is used to drive the inner rotor hollow shaft motor (3142) and the sonar probe (3143) to rotate as a whole in the tilt direction by a set angle, with a rotation range of 0 to 90 degrees; the inner rotor hollow shaft motor (3142) is used to drive the sonar probe (3143) to rotate in the circumferential direction by a set angle, with a rotation range of 0 to 360 degrees.

4. The high-efficiency cavity measuring device for a horizontal salt cavern storage according to claim 1, characterized in that, The crawling cavity measuring robot (3) also includes a stabilization module (312), which is a gyroscope.

5. The high-efficiency cavity measuring device for a horizontal salt cavern storage according to claim 1, characterized in that, It also includes a ground control system (4) and a cable (5); the crawling cavity robot (3) is connected to the ground control system (4) via the cable (5).

6. The high-efficiency cavity measuring device for a horizontal salt cavern storage according to claim 1, characterized in that, Vertical and inclined wells are drilled from the ground to the salt rock layer (7). The well casing (1) is fixed in the vertical and inclined wells. Horizontal wells (6) are drilled along the horizontal direction of the salt rock layer (7). The cavity tube (2) is lowered into the horizontal well (6) along the well casing (1).

7. A highly efficient method for detecting horizontal salt cavern reservoirs, characterized in that, The device employs a high-efficiency cavity measuring device for a horizontal salt cavern storage as described in any one of claims 1-6; and includes the following steps: S1. Inject fresh water into the cavity-forming pipe (2), and recover brine using the gap between the wellbore (1) and the cavity-forming pipe (2). When the height of the cavity (8) formed after the partial dissolution of the salt rock in the salt rock layer (7) reaches the preset height, stop the fresh water injection and brine recovery to ensure that the fluid in the cavity (8) is in equilibrium, that is, the temperature of the fluid is balanced. ,pressure ,concentration and flow rate Remain unchanged; S2. Lower the crawling cavity-measuring robot (3) along the cavity-making tube (2) to the end of the cavity-making tube (2), and rotate the sonar probe (3143) in the tilt direction and the vertical direction. At the same time, monitor the temperature of the fluid in the cavity (8) at this moment through the fluid sound velocity measurement module (313). ,pressure ,concentration and flow rate i = 0, 1, 2, ..., represents the number of rotations; obtain the sound velocity of the fluid inside the cavity (8). ; S3. Calculate the distance from the sonar probe (3143) to the wall of the cavity (8), and reconstruct the shape of the cavity (8) in three dimensions to obtain the shape of the cavity (8) in this case. m is the number of times the cavity-forming tube (2) retracts to measure the cavity; thus, the shape of the cavity (8) is obtained as follows: n represents the number of times the cavity-forming tube (2) is withdrawn to create a cavity; S4. Control the crawling cavity measuring robot (3) to crawl back from the end of the cavity-making tube (2) to the top; adjust the backward distance of the cavity-making tube (2), repeat steps S1 to S3 until the cavity (8) is completed, and obtain the real-time shape of the cavity (8) during the dissolution of the salt rock layer (7).

8. The efficient detection method for horizontal salt cavern reservoirs according to claim 7, characterized in that, In step S2, the sonar probe (3143) is controlled to rotate by an angle in the tilt direction using a rotary motor (3141). i = 0, 1, 2, ..., represents the number of rotations of the rotary motor (3141); the sonar probe (3143) is controlled to rotate in the vertical direction by an angle using the hollow shaft motor (3142) of the inner rotor. j=0,1,2,… represents the number of rotations of the hollow shaft motor (3142) in the inner rotor.

9. The efficient detection method for horizontal salt cavern reservoirs according to claim 8, characterized in that, In step S3, the sonar probe (3143) transmits and receives pulse signals to the wall of the cavity (8), transmits data along the cable (5), and records the transmission time of the pulse signals through the ground control system (4). Arrival time Rotation angle of the hollow shaft motor (3142) with inner rotor and the rotation angle of the rotary motor (3141) According to the corrected sound velocity of the fluid in the cavity (8) Pulse signal transmission time Arrival time Calculate the distance from the sonar probe (3143) to the wall of the cavity (8). ; Continue to use the hollow shaft motor (3142) to control the sonar probe (3143) to rotate in the vertical direction, increasing the angle by 15 degrees each time, until it rotates 360 degrees. Continue to adjust the rotary motor (3141), increasing the angle by 15 degrees each time, until it rotates 90 degrees. The distance from the sonar probe (3143) to the wall of the cavity (8) is determined by the rotation direction. The rotation angle of the hollow shaft motor (3142) with the inner rotor and the rotation angle of the rotary motor (3141) The shape of the cavity is reconstructed in three dimensions to obtain the shape of the cavity (8) in this case. .

10. The efficient detection method for horizontal salt cavern reservoirs according to claim 9, characterized in that, In step S4, the real-time cavity morphology during the dissolution of the salt rock layer (7) is the result of superimposing the cavity morphology obtained by retreating a certain distance each time. The final cavity (8) obtained after the salt rock dissolves is as follows: .

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