Cavity well two-phase medium interface remote detection system and method

Abstract

The present application relates to a kind of cavity well two-phase medium interface remote detection system and method, its system includes: remote control software platform, for receiving the well number of target cavity well, and issue data acquisition instruction;Multi-channel photoelectric switch is connected with downhole composite optical cable and temperature demodulation module, for generating target communication control line based on the well number of target cavity well;Optical cable power heating control module, for generating heating control instruction;Downhole composite optical cable, for responding heating control instruction and generating the temperature-sensitive characteristic curve of target cavity well by self-heating;Temperature demodulation module, for responding data acquisition instruction, and according to target communication control line, the temperature-sensitive characteristic data of target cavity well is collected;Remote control software platform is also used to receive temperature-sensitive characteristic data, and determine the two-phase interface depth position of target cavity well based on temperature-sensitive characteristic data.The present application can realize the remote detection of salt cavern gas storage cavity well two-phase medium interface.

Description

Technical Field

[0001] This invention relates to the field of photoelectric detection technology, and in particular to a remote detection system and method for the interface of two-phase media in cavity wells. Background Technology

[0002] my country's salt cavern gas storage construction has entered a stage of rapid development. As a key factor in ensuring the safe and stable operation of the cavity, high-precision monitoring of the oil-water or gas-water two-phase interface is receiving increasing attention. In the cavity construction process of salt cavern gas storage, water-soluble cavity construction utilizes the characteristic that salt rock is insoluble in diesel or nitrogen. Diesel or nitrogen is used as an inhibitor to control the contact surface between water and salt rock, protecting the upper salt rock layer and achieving the goal of cavity construction according to design requirements. If the two-phase interface is not effectively controlled, on the one hand, the cavity volume will be lost, affecting the cavity shape and consequently the stability of later operation; on the other hand, if dissolution occurs at the end of cavity construction, it will affect the sealing and integrity of the entire cavity. Therefore, accurate measurement of the multiphase media within the cavity, especially the oil-water or gas-water two-phase interface, is particularly important during water-soluble cavity construction.

[0003] Controlling the position of the two-phase medium interface is crucial for controlling the cavity morphology and limiting the storage capacity and stability of gas reservoirs. For cavity-forming wells, commonly used methods for oil-water interface control include surface observation, pressure gauge monitoring, downhole resistance sensor measurement, and neutron logging. Among these, surface observation is simple, direct, and low-cost, but only suitable for positive circulation cavity formation; pressure gauge monitoring yields inaccurate results; neutron logging provides accurate measurements but is costly; and downhole resistance sensor measurements have poor stability and a limited measurement range.

[0004] Therefore, how to propose a remote detection system and method for the two-phase medium interface in cavity-forming wells to realize the oil-water interface testing in the large-scale reverse circulation cavity-forming process is an urgent problem to be solved. Summary of the Invention

[0005] In view of this, it is necessary to provide a remote detection system and method for the two-phase medium interface in cavity-forming wells, so as to realize the oil-water interface test in the large-scale reverse circulation cavity-forming process.

[0006] To achieve the above objectives, in a first aspect, the present invention provides a remote detection system for the interface of two-phase media in a cavity-forming well, comprising: a remote control software platform, a multi-channel photoelectric switch, a temperature demodulation module, an optical cable power-on heating control module, and a downhole composite optical cable;

[0007] The remote control software platform is used to receive the well number of the target cavity-forming well and issue data acquisition commands.

[0008] The multi-channel photoelectric switch is connected to the downhole composite optical cable and the temperature demodulation module to generate a target communication control line based on the well number of the target cavity-forming well.

[0009] The optical cable power-on heating control module is used to generate heating control commands;

[0010] The downhole composite optical cable is used to generate self-heating in response to the heating control command and to generate the temperature-sensitive characteristic curve of the target cavity-forming well.

[0011] The temperature demodulation module is used to respond to the data acquisition command and acquire the temperature-sensitive characteristic data of the target cavity-forming well according to the target communication control line;

[0012] The remote control software platform is also used to receive the temperature-sensitive characteristic data and determine the depth position of the two-phase interface of the target cavity well based on the temperature-sensitive characteristic data.

[0013] Furthermore, the temperature-sensitive characteristic data includes the original temperature-sensitive characteristic data of the target cavity well before it is heated and the real-time temperature-sensitive characteristic data during heating; the remote control software platform includes a temperature-sensitive data acquisition module, a temperature-sensitive data processing module, and a two-phase interface depth and position determination module.

[0014] The temperature-sensitive data acquisition module is used to acquire the original temperature-sensitive characteristic data and the real-time temperature-sensitive characteristic data;

[0015] The temperature-sensitive data processing module is used to determine the real-time temperature-sensitive difference response curve based on the original temperature-sensitive characteristic data and the real-time temperature-sensitive characteristic data.

[0016] The two-phase interface depth location determination module is used to determine the protrusion position of the temperature-sensitive difference response curve, and calculate the two-phase interface depth location of the target cavity well based on the depth data corresponding to the protrusion position.

[0017] Furthermore, the temperature-sensitive data processing module includes a temperature-sensitive curve plotting unit and a temperature-sensitive difference response curve plotting unit;

[0018] The temperature-sensitive curve plotting unit is used to plot a reference temperature-sensitive characteristic data curve based on the original temperature-sensitive characteristic data, and to plot a real-time temperature-sensitive characteristic data curve based on the real-time temperature-sensitive characteristic data.

[0019] The temperature-sensitivity difference response curve plotting unit is used to compare and subtract the real-time temperature-sensitivity characteristic data curve from the reference temperature-sensitivity characteristic data curve to obtain the real-time temperature-sensitivity difference response curve.

[0020] Furthermore, the heating control command includes a heating voltage control command that includes the rated heating voltage and a heating current control command that includes the rated heating current.

[0021] Furthermore, the optical cable power-on heating control module includes a power supply unit, a transformer unit, a voltage regulator unit, a current regulator unit, and an output unit;

[0022] The power supply unit is connected to an external power source and is used to receive the initial power signal input from the external power source.

[0023] The transformer unit is used to receive the initial power signal and convert the voltage value of the initial power signal to obtain the power signal to be processed.

[0024] The voltage regulation unit is used to receive the power signal to be processed and perform voltage regulation processing to obtain a regulated power signal.

[0025] The current stabilizing unit is used to receive the regulated power supply signal and perform current stabilization processing to obtain a regulated current power supply signal.

[0026] The output unit is used to generate the heating voltage control command and the heating current control command based on the regulated power supply signal.

[0027] Furthermore, the downhole composite optical cable includes a resistance wire and a first multimode optical fiber;

[0028] The resistance wire is used to generate self-heating in response to the heating control command and to generate the temperature-sensitive characteristic curve of the target cavity well;

[0029] The first multimode optical fiber is used to transmit the temperature-sensitive characteristic curve to the temperature demodulation module.

[0030] Furthermore, the remote detection system for the two-phase medium interface of the cavity-making well also includes a composite optical cable above the well.

[0031] The well-mounted composite optical cable includes communication optical fiber and second multimode optical fiber;

[0032] The communication optical fiber is used to control the start and stop of the optical cable power-on heating control module;

[0033] The multimode optical fiber is connected to the multi-channel photoelectric switch and the downhole composite optical cable optical fiber, respectively, and is used to transmit the temperature-sensitive characteristic curve to the multi-channel photoelectric switch.

[0034] Furthermore, the temperature demodulation module includes multiple fiber optic temperature demodulators corresponding to each of the multiple cavity-forming wells.

[0035] Furthermore, the temperature demodulation module includes a fiber optic temperature demodulator corresponding to each of the multiple cavity-forming wells.

[0036] Secondly, the present invention also provides a method for detecting the interface of a two-phase medium in a cavity-forming well, applied in the aforementioned remote detection system for the interface of a two-phase medium in a cavity-forming well, comprising:

[0037] Obtain the well number of the target cavity-forming well, and determine the target communication control line based on the well number of the target cavity-forming well;

[0038] Heating control commands are generated based on the target communication control line to enable the downhole composite optical cable in the target cavity well to generate self-heating.

[0039] Data acquisition instructions are generated based on the target communication control line to acquire the temperature-sensitive characteristic data of the target cavity-forming well;

[0040] The depth of the two-phase interface of the target cavity well is determined based on the temperature-sensitive characteristic data.

[0041] The beneficial effects of the above embodiments are as follows: The present invention constructs a remote detection system for the two-phase medium interface of salt cavern wells by utilizing a heatable downhole composite optical cable, a temperature demodulation module, a downhole composite optical cable, an optical cable power-on heating control module, and a remote control software platform, and rationally arranges each module to form a remote monitoring, control, and data transmission system to realize the remote detection of the two-phase medium interface of salt cavern gas storage wells, thereby realizing the oil-water interface test in the large-scale reverse circulation cavity construction process. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of an embodiment of a remote detection system for the interface of two-phase media in a cavity-forming well provided by the present invention;

[0043] Figure 2 This is a schematic diagram illustrating the connection between an optical cable power-on heating control module and an underground composite optical cable, according to an embodiment of the present invention.

[0044] Figure 3 This is a schematic diagram illustrating the application of multiple cavity-forming wells corresponding to multiple fiber optic temperature demodulators according to an embodiment of the present invention;

[0045] Figure 4 This is a flowchart illustrating an embodiment of a method for detecting the interface between two phase media in a cavity well provided by the present invention. Detailed Implementation

[0046] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0047] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Furthermore, "a plurality of" means two or more, unless otherwise explicitly specified. The reference to "embodiment" herein 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 in 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.

[0048] The specific embodiments are described in detail below:

[0049] Please see Figure 1 , Figure 1 This is a flowchart illustrating an embodiment of a remote detection system for the interface of two-phase media in a cavity well provided by the present invention. In a specific embodiment of the present invention, a remote detection system 100 for the interface of two-phase media in a cavity well is disclosed, including: a remote control software platform 101, a multi-channel photoelectric switch 102, a temperature demodulation module 103, an optical cable power-on heating control module 104, and a downhole composite optical cable 105.

[0050] The remote control software platform 101 is used to receive the well number of the target cavity-forming well and issue data acquisition commands;

[0051] The multi-channel photoelectric switch 102 is connected to the downhole composite optical cable 105 and the temperature demodulation module 103 to generate the target communication control line based on the well number of the target cavity-making well.

[0052] The optical cable power-on heating control module 104 is used to generate heating control commands;

[0053] The downhole composite optical cable 105 is used to generate heat in response to heating control commands and to generate the temperature-sensitive characteristic curve of the target cavity well.

[0054] The temperature demodulation module 103 is used to respond to data acquisition commands and acquire temperature-sensitive characteristic data of the target cavity-forming well according to the target communication control line;

[0055] The remote control software platform 101 is also used to receive temperature-sensitive characteristic data and determine the depth of the two-phase interface of the target cavity well based on the temperature-sensitive characteristic data.

[0056] It is understandable that, such as Figure 1As shown, a remote detection system for the two-phase medium interface in salt cavern wells is constructed using a heatable downhole composite optical cable 105, a temperature demodulation module 103, an optical cable energized heating control module 104, and a remote control software platform 101. The modules are rationally deployed to form a remote monitoring, control, and data transmission system. Specifically, a downhole composite optical cable 105 and an optical cable energized heating control module 104 are deployed in each well and connected to the remote control software platform 101.

[0057] The remote control software platform 101 receives the well number of the target cavity-forming well and issues a data acquisition command. The multi-channel photoelectric switch 102 is connected to multiple cavity-forming wells and switches channels in response to the well number of the target cavity-forming well, generating a target communication control line for the target cavity-forming well. That is, the target communication control line is the communication line for controlling the target cavity-forming well. Then, the optical cable power-on heating control module 104 generates a heating control command, and the downhole composite optical cable 105 in the target cavity-forming well responds to the heating control command to generate self-heating, generating the temperature-sensitive characteristic curve of the target cavity-forming well. Finally, the temperature demodulation module 103 responds to the data acquisition command and collects the temperature-sensitive characteristic data of the target cavity-forming well according to the target communication control line. The remote control software platform 101 receives the temperature-sensitive characteristic data and determines the two-phase interface depth position of the target cavity-forming well based on the temperature-sensitive characteristic data, realizing the joint testing and accurate measurement of the two-phase medium interface of multiple cavity-forming wells.

[0058] This invention constructs a remote detection system for the two-phase medium interface in salt cavern wells using a heatable downhole composite optical cable 105, a temperature demodulation module 103, a power-on heating control module 104, and a remote control software platform 101. The modules are rationally arranged to form a remote monitoring, control, and data transmission system, enabling remote detection of the two-phase medium interface in salt cavern gas storage wells. This allows for oil-water interface testing during large-scale reverse circulation cavity construction.

[0059] In one embodiment of the present invention, the temperature-sensitive characteristic data includes the original temperature-sensitive characteristic data of the target cavity well before it is heated and the real-time temperature-sensitive characteristic data during heating; the remote control software platform 101 includes a temperature-sensitive data acquisition module, a temperature-sensitive data processing module, and a two-phase interface depth position determination module.

[0060] The temperature-sensitive data acquisition module is used to acquire raw temperature-sensitive characteristic data and real-time temperature-sensitive characteristic data;

[0061] The temperature-sensitive data processing module is used to determine the real-time temperature-sensitive difference response curve based on the original temperature-sensitive characteristic data and the real-time temperature-sensitive characteristic data;

[0062] The two-phase interface depth location determination module is used to determine the protrusion position of the temperature-sensitive difference response curve, and calculate the two-phase interface depth location of the target cavity well based on the depth data corresponding to the protrusion position.

[0063] The temperature-sensitive data processing module includes a temperature-sensitive curve plotting unit and a temperature-sensitive difference response curve plotting unit;

[0064] The temperature-sensitive curve plotting unit is used to plot the baseline temperature-sensitive characteristic data curve based on the original temperature-sensitive characteristic data, and to plot the real-time temperature-sensitive characteristic data curve based on the real-time temperature-sensitive characteristic data.

[0065] The temperature-sensitivity difference response curve plotting unit is used to compare and subtract the real-time temperature-sensitivity characteristic data curve from the reference temperature-sensitivity characteristic data curve to obtain the real-time temperature-sensitivity difference response curve.

[0066] Understandably, the remote control software platform 101 primarily achieves remote detection and control of the oil-water / gas-water interface of the cavity-forming well in the salt cavern gas storage facility through user interaction. First, it responds to the well number of the target cavity-forming well input by the user, controlling the input / output channels of the multi-channel photoelectric switch 102. Then, it controls the temperature demodulation module 103 to acquire temperature-sensitive data. Finally, it receives and processes this temperature-sensitive data to determine the depth and location of the two-phase interface of the target cavity-forming well.

[0067] First, it should be noted that the temperature demodulation module 103 is specifically a distributed fiber optic temperature demodulator, which is used to demodulate the temperature-sensitive characteristic data of the target cavity well before and after heating, and send the temperature-sensitive characteristic data to the remote control software platform 101 for processing. The distributed fiber optic temperature demodulator includes a laser source, a laser beam splitter, a photoelectric signal analyzer, and a display.

[0068] Understandably, the remote control software platform 101 primarily calculates and analyzes the depth change position of the two-phase medium interface based on its secondary temperature-sensitive characteristics. Its main principle is as follows: during the active heating process of the armored heated composite optical cable, due to the different specific heat capacities of different media such as diesel and brine, their heating and cooling rates also differ, and their temperature-sensitive characteristics vary significantly. Therefore, abrupt changes and temperature gradients occur at the gas-oil-water interface, allowing for the detection and accurate positioning of the oil-water / gas-water interface.

[0069] Specifically, the remote control software platform 101 includes a temperature-sensitive data acquisition module, a temperature-sensitive data processing module, and a two-phase interface depth location determination module. First, the temperature-sensitive data acquisition module acquires raw and real-time temperature-sensitive characteristic data. Then, the temperature-sensitive data processing module determines the real-time temperature-sensitive difference response curve based on the raw and real-time temperature-sensitive characteristic data. Specifically, the temperature-sensitive data processing module includes a temperature-sensitive curve plotting unit and a temperature-sensitive difference response curve plotting unit. The temperature-sensitive curve plotting unit plots a baseline temperature-sensitive characteristic data curve based on the raw temperature-sensitive characteristic data and a real-time temperature-sensitive characteristic data curve based on the real-time temperature-sensitive characteristic data. The temperature-sensitive difference response curve plotting unit compares and subtracts the real-time temperature-sensitive characteristic data curve from the baseline temperature-sensitive characteristic data curve to obtain the real-time temperature-sensitive difference response curve. Finally, the two-phase interface depth location determination module determines the convex position of the temperature-sensitive difference response curve and calculates the two-phase interface depth location of the target cavity well based on the depth data corresponding to the convex position.

[0070] For example: The multi-channel photoelectric switch 102 automatically switches to the target cavity-forming well line to be detected. A distributed fiber optic temperature demodulator collects the original temperature-sensitive characteristic data of the target cavity-forming well before heating. Then, the downhole composite optical cable 105 is heated for 3 minutes, and the distributed fiber optic temperature demodulator collects the real-time temperature-sensitive characteristic data of the target cavity-forming well during heating. The real-time temperature-sensitive characteristic data curve after heating is then subtracted from the original temperature-sensitive characteristic data curve before heating to obtain the curve's peak position. Finally, the interface position of the two-phase medium, i.e., the oil-water or gas-water interface position within the cavity-forming well, is determined based on the signal peak position. It should be noted that if there is a need for remote detection of multiple cavity-forming wells, the above steps can be repeated.

[0071] In one embodiment of the present invention, the multi-channel photoelectric switch 102 is also used for data exchange and communication signals during remote monitoring and detection.

[0072] Understandably, the main function of the multi-channel photoelectric switch 102 is to respond to the user's selection of the target cavity-forming well number and automatically switch to the target communication control line corresponding to the target cavity-forming well. At the same time, it must also ensure the remote control of data exchange and communication signals during the remote monitoring and control process.

[0073] In one embodiment of the present invention, the heating control command includes a heating voltage control command including a heating rated voltage and a heating current control command including a heating rated current.

[0074] The optical cable power-on heating control module 104 includes a power supply unit, a transformer unit, a voltage regulator unit, a current regulator unit, and an output unit;

[0075] The power supply unit is connected to an external power source to receive the initial power signal input from the external power source.

[0076] The transformer unit is used to receive the initial power signal and convert the voltage value of the initial power signal to obtain the power signal to be processed.

[0077] The voltage regulator unit is used to receive and regulate the power signal to be processed to obtain a regulated power signal;

[0078] The current stabilization unit is used to receive and process the regulated power supply signal to obtain a regulated current power supply signal.

[0079] The output unit is used to generate heating voltage control commands and heating current control commands based on the regulated power supply signal.

[0080] It is understandable that the heating control commands output by the underground optical cable energized heating control module 104 include heating voltage control commands for the rated heating voltage and heating current control commands for the rated heating current. That is, the underground optical cable energized heating control module 104 can quantitatively output voltage and current to control the heating power of the resistance wire in the underground composite optical cable 105.

[0081] The downhole optical cable energized heating control module 104 includes a power supply unit, a transformer unit, a voltage regulator unit, a current regulator unit, and an output unit. Specifically, the power supply unit connects to an external power source and its main function is to receive the initial power signal input from the external power source. The transformer unit's main function is to receive the initial power signal and convert its voltage value to obtain the power signal to be processed. The voltage regulator unit's main function is to receive and regulate the voltage of the power signal to be processed, obtaining a regulated power signal. The current regulator unit's function is to receive and regulate the current of the regulated power signal, obtaining a regulated voltage and current power signal. The output unit's function is to generate heating voltage control commands and heating current control commands based on the regulated voltage and current power signals. In other words, the downhole optical cable energized heating control module 104 controls the output voltage and output current to control the heating power of the resistance wire in the actively heated downhole composite optical cable 105, preventing overheating of the actively heated downhole composite optical cable 105, which could lead to cable damage, or insufficient heating power, which could cause failure in oil-water interface detection.

[0082] In one embodiment of the present invention, the downhole composite optical cable 105 includes a resistance wire and a first multimode optical fiber;

[0083] The resistance wire is used to generate heat in response to heating control commands and to generate the temperature-sensitive characteristic curve of the target cavity well;

[0084] The first multimode fiber is used to transmit the temperature-sensitive characteristic curve to the temperature demodulation module 103.

[0085] Understandably, the underground composite optical cable 105 mainly consists of multiple resistance wires and a first multimode optical fiber. Please refer to [link / reference needed]. Figure 2 , Figure 2 This is a schematic diagram illustrating the connection between an optical cable energized heating control module 104 and a downhole composite optical cable 105, according to an embodiment of the present invention. One end of a resistance wire is connected to the downhole optical cable energized heating control module 104. By inputting a rated current and voltage, the resistance wire is heated, thereby causing the downhole composite optical cable 105 to heat up and generating a temperature-sensitive characteristic curve for the target cavity-forming well. One end of a first multimode optical fiber is connected to a communication optical fiber and a second multimode optical fiber in the downhole composite optical cable 105, and is further connected to a multi-channel photoelectric switch 102 and a distributed optical fiber temperature demodulator. By transmitting the temperature-sensitive characteristic curve to the distributed optical fiber temperature demodulator, remote detection and positioning of the two-phase medium interface of the target cavity-forming well are ultimately achieved.

[0086] In one embodiment of the present invention, the remote detection system for the two-phase medium interface of the cavity well also includes a composite optical cable 106 on the well surface, which includes a communication optical fiber and a second multimode optical fiber.

[0087] The communication optical fiber is used to control the start and stop of the optical cable power supply heating control module 104;

[0088] The second multimode optical fiber is connected to the multi-channel photoelectric switch 102 and the downhole composite optical cable 105 optical fiber respectively, and is used to transmit the temperature-sensitive characteristic curve to the multi-channel photoelectric switch 102.

[0089] Understandably, the wellhead composite optical cable 106 is mainly composed of multiple communication optical fibers and multiple second multimode optical fibers. The communication optical fibers are primarily responsible for signal control of the downhole optical cable's power-on heating control model, thereby determining when the heating module starts and stops heating, and outputting control signals for the current and voltage levels of the optical cable heating. One end of the second multimode optical fiber is connected to a multi-channel photoelectric switch 102, and the other end is directly connected to the first multimode optical fiber in the active heating type downhole composite optical cable 105. This is used to transmit the temperature-sensitive characteristic curve to the multi-channel photoelectric switch 102 and then to the software control platform, ensuring lossless data transmission and ultimately enabling the remote control software platform 101 to remotely detect the interface between the two phases of the cavity-forming well.

[0090] In one embodiment of the present invention, the temperature demodulation module 103 (i.e. Figure 3 The fiber optic temperature demodulator (FEP) in the system includes multiple FEPs corresponding to multiple cavity wells.

[0091] Please see Figure 3 , Figure 3This is a schematic diagram illustrating the application of multiple fiber optic temperature demodulators corresponding to multiple cavity-forming wells, as provided in one embodiment of the present invention. First, it should be noted that the fiber optic temperature demodulator, in addition to its data acquisition function, also possesses data processing capabilities. It can be understood that by installing a fiber optic temperature demodulator and a heating power supply near each cavity-forming well, with the heating power supply energized near the wellhead, each fiber optic temperature demodulator acquires and processes the temperature-sensitive characteristic data within each corresponding cavity-forming well in real time, thereby improving the data processing speed.

[0092] In one embodiment of the present invention, the temperature demodulation module 103 includes a fiber optic temperature demodulator corresponding to a plurality of cavity wells.

[0093] Understandably, this can be achieved by extending the multimode fiber from two cavity-forming wells to the nearest well to jointly connect to the fiber optic temperature demodulator, or by extending the multimode fiber from all three cavity-forming wells to jointly connect to the fiber optic temperature demodulator. The fiber optic temperature demodulator acquires and processes the temperature-sensitive characteristic data within one of the cavity-forming wells in a time-division multiplexing manner via parallel serial ports to determine the oil-water interface location. Therefore, the time-division multiplexing method effectively utilizes the resources of the fiber optic temperature demodulator.

[0094] To better implement the remote detection system for the two-phase medium interface in cavity-forming wells according to the embodiments of the present invention, the embodiments of the present invention also provide a method for detecting the two-phase medium interface in cavity-forming wells. This method is applied to the aforementioned remote detection system for the two-phase medium interface in cavity-forming wells. Please refer to [link to relevant documentation]. Figure 4 , Figure 4 A schematic flowchart of an embodiment of a method for detecting the interface of a two-phase medium in a cavity well provided by the present invention includes:

[0095] Step S401: Obtain the well number of the target cavity-forming well, and determine the target communication control line based on the well number of the target cavity-forming well;

[0096] Step S402: Generate heating control commands based on the target communication control line to enable the downhole composite optical cable in the target cavity well to generate self-heating;

[0097] Step S403: Generate a data acquisition command based on the target communication control line to acquire the temperature-sensitive characteristic data of the target cavity-forming well;

[0098] Step S404: Determine the depth of the two-phase interface of the target cavity well based on temperature-sensitive characteristic data.

[0099] It should be noted that the methods provided in the above embodiments can implement the technical solutions described in the above system embodiments, and will not be repeated here.

[0100] 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.

[0101] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes 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 remote detection system for the interface of two-phase media in a cavity-forming well, characterized in that, include: Remote control software platform, multi-channel photoelectric switch, temperature demodulation module, optical cable power-on heating control module, and downhole composite optical cable; The remote control software platform is used to receive the well number of the target cavity-forming well and issue data acquisition commands. The multi-channel photoelectric switch is connected to the downhole composite optical cable and the temperature demodulation module to generate a target communication control line based on the well number of the target cavity-forming well. The optical cable power-on heating control module is used to generate heating control commands; The downhole composite optical cable is used to generate self-heating in response to the heating control command and to generate the temperature-sensitive characteristic curve of the target cavity-forming well. The temperature demodulation module is used to respond to the data acquisition command and acquire the temperature-sensitive characteristic data of the target cavity-forming well according to the target communication control line; The remote control software platform is also used to receive the temperature-sensitive characteristic data and determine the two-phase interface depth position of the target cavity-forming well based on the temperature-sensitive characteristic data. The temperature-sensitive characteristic data includes the original temperature-sensitive characteristic data of the target cavity well before it is heated and the real-time temperature-sensitive characteristic data during heating; the remote control software platform includes a temperature-sensitive data acquisition module, a temperature-sensitive data processing module, and a two-phase interface depth and position determination module. The temperature-sensitive data acquisition module is used to acquire the original temperature-sensitive characteristic data and the real-time temperature-sensitive characteristic data; The temperature-sensitive data processing module is used to determine the real-time temperature-sensitive difference response curve based on the original temperature-sensitive characteristic data and the real-time temperature-sensitive characteristic data. The two-phase interface depth location determination module is used to determine the protrusion position of the temperature-sensitive difference response curve, and calculate the two-phase interface depth location of the target cavity well based on the depth data corresponding to the protrusion position. The temperature-sensitive data processing module includes a temperature-sensitive curve plotting unit and a temperature-sensitive difference response curve plotting unit; The temperature-sensitive curve plotting unit is used to plot a reference temperature-sensitive characteristic data curve based on the original temperature-sensitive characteristic data, and to plot a real-time temperature-sensitive characteristic data curve based on the real-time temperature-sensitive characteristic data. The temperature-sensitivity difference response curve plotting unit is used to compare and subtract the real-time temperature-sensitivity characteristic data curve from the reference temperature-sensitivity characteristic data curve to obtain the real-time temperature-sensitivity difference response curve.

2. The remote detection system for the two-phase medium interface in a cavity-forming well according to claim 1, characterized in that, The heating control command includes a heating voltage control command that includes the rated heating voltage and a heating current control command that includes the rated heating current.

3. The remote detection system for the two-phase medium interface in a cavity-forming well according to claim 2, characterized in that, The optical cable power-on heating control module includes a power supply unit, a transformer unit, a voltage regulator unit, a current regulator unit, and an output unit; The power supply unit is connected to an external power source and is used to receive the initial power signal input from the external power source. The transformer unit is used to receive the initial power signal and convert the voltage value of the initial power signal to obtain the power signal to be processed. The voltage regulation unit is used to receive the power signal to be processed and perform voltage regulation processing to obtain a regulated power signal. The current stabilizing unit is used to receive the regulated power supply signal and perform current stabilization processing to obtain a regulated current power supply signal. The output unit is used to generate the heating voltage control command and the heating current control command based on the regulated power supply signal.

4. The remote detection system for the two-phase medium interface in a cavity-forming well according to claim 1, characterized in that, The downhole composite optical cable includes a resistance wire and a first multimode optical fiber; The resistance wire is used to generate self-heating in response to the heating control command and to generate the temperature-sensitive characteristic curve of the target cavity well; The first multimode optical fiber is used to transmit the temperature-sensitive characteristic curve to the temperature demodulation module.

5. The remote detection system for the two-phase medium interface in a cavity-forming well according to claim 1, characterized in that, The remote detection system for the two-phase medium interface of the cavity-making well also includes a composite optical cable on the well surface. The well-mounted composite optical cable includes communication optical fiber and second multimode optical fiber; The communication optical fiber is used to control the start and stop of the optical cable power-on heating control module; The second multimode optical fiber is connected to the multi-channel photoelectric switch and the downhole composite optical cable optical fiber, respectively, and is used to transmit the temperature-sensitive characteristic curve to the multi-channel photoelectric switch.

6. The remote detection system for the two-phase medium interface in a cavity-forming well according to claim 1, characterized in that, The temperature demodulation module includes multiple fiber optic temperature demodulators, each corresponding to one of the multiple cavity wells.

7. The remote detection system for the two-phase medium interface in a cavity-forming well according to claim 1, characterized in that, The temperature demodulation module includes a fiber optic temperature demodulator corresponding to each of the multiple cavity wells.

8. A method for detecting the interface of a two-phase medium in a cavity-forming well, applied to the remote detection system for the interface of a two-phase medium in a cavity-forming well as described in any one of claims 1 to 7, characterized in that, The method includes: Obtain the well number of the target cavity-forming well, and determine the target communication control line based on the well number of the target cavity-forming well; Heating control commands are generated based on the target communication control line to enable the downhole composite optical cable in the target cavity well to generate self-heating. Data acquisition instructions are generated based on the target communication control line to acquire the temperature-sensitive characteristic data of the target cavity-forming well; The depth of the two-phase interface of the target cavity well is determined based on the temperature-sensitive characteristic data.

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