Gas well liquid drainage production management method based on optical fiber monitoring and related equipment

Abstract

The invention discloses a gas well drainage production management method based on optical fiber monitoring and related equipment, and the method comprises the steps: collecting pressure data and temperature data corresponding to a plurality of depth points of each well section along the way in a shaft through an optical fiber measurement mode, analyzing the gas-liquid flow state in the shaft, and obtaining the flow state change characteristics and gas-liquid distribution results; the method comprises the following steps: establishing a distribution model through flow state change characteristics, analyzing the liquid lifting capacity of gas in a gas well and judging the discharge time of accumulated liquid in combination with a gas-liquid distribution result to obtain critical liquid-carrying energy and accumulated liquid information, and automatically adjusting a production system through the critical liquid-carrying energy and the accumulated liquid information in combination with gas well information, so as to realize automatic control of the gas well. Outputting a state instruction to a remote well opening and closing device; and finally, the remote well opening and closing device controls the gas well to execute production management according to the state instruction. By adopting the method, the production system can be automatically adjusted in time, the productivity of the gas well is fully exerted, the cumulative recovery efficiency and yield of the gas well are improved, the effective production time of the gas well is prolonged, and the labor intensity of workers is reduced.

Description

Technical Field

[0001] The invention belongs to the field of gas production technology, and in particular relates to a gas well drainage production management method based on optical fiber monitoring and related equipment. Background Art

[0002] During the gas well production process, with the extension of production time, the decrease of production pressure and the aggravation of wellbore fluid accumulation, it is mainly divided into three production stages: high-pressure continuous production stage, measure drainage continuous production stage and low-pressure intermittent recovery pressure drainage production stage; among them, the low-pressure intermittent recovery pressure drainage production stage accounts for more than 60% of the production stage of the gas well's entire life cycle, and the cumulative gas production accounts for 40% of the total cumulative gas production of the gas well, which is crucial in the gas well production stage.

[0003] Conventional intermittent production of gas wells uses remote well opening and closing technology to reduce manpower and improve work efficiency. However, the formulation of production systems for each well still requires employees with rich work experience to invest a lot of time in exploration. The production efficiency of gas wells is still not high, and unreasonable systems often lead to gas wells being shut down due to liquid accumulation, causing serious economic losses.

[0004] The production system formulated based on experience is mainly through oil casing pressure monitoring and analysis. This method can only roughly reflect the recovery of gas well pressure, and cannot accurately display the liquid accumulation and pressure distribution in the wellbore. It is impossible to adjust the production system according to the actual liquid accumulation situation in the wellbore. Summary of the invention

[0005] In order to overcome the shortcomings of the above-mentioned technology, the present invention provides a gas well drainage production management method and related equipment based on optical fiber monitoring, which can solve the technical problem that the existing monitoring means cannot accurately grasp the distribution of liquid accumulation and pressure inside the gas well, resulting in the inability to accurately formulate and implement the intermittent production system of the gas well.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A gas well drainage production management method based on optical fiber monitoring, comprising:

[0008] Based on the optical fiber measurement method, the pressure and temperature data corresponding to multiple depth points along each well section in the wellbore are obtained;

[0009] According to the pressure data and temperature data, the gas-liquid flow pattern in the wellbore is analyzed to obtain the flow pattern change characteristics and gas-liquid distribution results;

[0010] A distribution model is established based on the flow pattern change characteristics. Combined with the gas-liquid distribution results, the ability of gas in the gas well to lift liquid is analyzed and the discharge time of accumulated liquid is determined to obtain the critical liquid carrying energy and accumulated liquid information.

[0011] According to the critical liquid carrying energy and liquid accumulation information, the production system is automatically adjusted in combination with the gas well information, and the status instructions are output to the remote well opening and closing device;

[0012] The remote well switching device controls the gas well to perform production management according to the status instructions.

[0013] Furthermore, the specific steps of obtaining pressure data and temperature data include:

[0014] A fiber optic monitor is placed in the wellbore, and optical fiber is used to collect pressure and temperature data corresponding to different depths from the bottom of the well to the wellhead.

[0015] Furthermore, the specific steps of analyzing the gas-liquid flow state in the wellbore include:

[0016] Based on the pressure data and temperature data, the pure liquid phase, pure gas phase and two-phase flow transition zone in the wellbore are analyzed, evaluated, judged and displayed to obtain the flow change characteristics and gas-liquid distribution results; wherein the two-phase flow transition zone includes bubbly flow, mist flow and gas-liquid mixed flow.

[0017] Furthermore, the flow state change characteristics include the flow state change characteristics of "no liquid-carrying liquid-liquid accumulation", and the instantaneous oil-casing pressure difference gas production curve of gas well liquid accumulation is obtained according to the flow state change characteristics; and the distribution model is established according to the instantaneous oil-casing pressure difference gas production curve of gas well liquid accumulation.

[0018] Furthermore, the liquid accumulation information includes the gas-liquid flow state, liquid accumulation state and liquid accumulation position in the wellbore.

[0019] Furthermore, according to the critical liquid carrying energy and liquid accumulation information, the production system is automatically adjusted in combination with the gas well information to obtain the best intermittent switching well production system; the status instructions are generated according to the best intermittent switching well production system; the status instructions are sent to the remote switching well device to control the gas well to perform production management.

[0020] Furthermore, the gas well information includes gas well bore information, gas production information and formation pressure information.

[0021] A gas well drainage production management system based on optical fiber monitoring, used to implement the steps of the above-mentioned gas well drainage production management method based on optical fiber monitoring, including:

[0022] A data acquisition module is used to obtain pressure data and temperature data corresponding to multiple depth points along each well section in the wellbore based on an optical fiber measurement method;

[0023] The analysis module is used to analyze the transition zone in the wellbore based on the pressure data and temperature data to obtain the flow pattern change characteristics and gas-liquid distribution results;

[0024] The model building module is used to establish a distribution model based on the flow pattern change characteristics, analyze the gas lifting liquid ability in the gas well and determine the discharge time of the accumulated liquid in combination with the gas-liquid distribution results, and obtain the critical liquid carrying energy and liquid accumulation information;

[0025] The command output module is used to automatically adjust the production system according to the critical liquid carrying energy and liquid accumulation information in combination with the gas well information, and output the status command to the remote well opening and closing device;

[0026] The instruction execution module is used for the remote well switch device to control the gas well to execute production management according to the status instruction.

[0027] A device comprising:

[0028] Memory for storing computer programs;

[0029] A processor is used to implement the steps of the gas well drainage production management method based on optical fiber monitoring as described in any one of claims 1 to 7 when executing the computer program.

[0030] A computer-readable storage medium stores a computer program, which, when executed by a processor, is used to implement the steps of the above-mentioned gas well drainage production management method based on optical fiber monitoring.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The present invention provides a gas well drainage production management method based on optical fiber monitoring. The method collects pressure data and temperature data corresponding to multiple depth points in each well section along the wellbore by optical fiber measurement, and then analyzes the gas-liquid flow state in the wellbore to obtain flow state change characteristics and gas-liquid distribution results. A distribution model is established based on the flow state change characteristics and combined with the gas-liquid distribution results, the ability of gas in the gas well to lift liquid is analyzed and the discharge time of accumulated liquid is judged to obtain critical liquid carrying energy and liquid accumulation information. The production system is automatically adjusted based on the critical liquid carrying energy and liquid accumulation information in combination with gas well information, and a state instruction is output to a remote well switching device; finally, the remote well switching device controls the gas well to perform production management according to the state instruction.

[0033] This method reflects the distribution of liquid accumulation and pressure inside the wellbore based on optical fiber monitoring, makes full use of the flow state to judge the rationality of the gas well production system, and is linked with the remote well switching device to automatically adjust the production system in time, give full play to the gas well production capacity, improve the cumulative recovery rate and output of the gas well, extend the effective production time of the gas well, and reduce the labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a flow chart of a gas well drainage production management method based on optical fiber monitoring in an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of optical fiber monitoring of a wellbore in an embodiment of the present invention;

[0036] Figure 3 Schematic diagram of flow pattern change characteristics of "from no liquid - carrying liquid - to liquid accumulation" in an embodiment of the present invention;

[0037] Among them, (a) is the flow change characteristics of pure liquid phase; (b) is the flow change characteristics of pure gas phase; (c) is the flow change characteristics of gas-liquid two-phase;

[0038] Figure 4 This is a schematic diagram of a remote well opening and closing device in an embodiment of the present invention;

[0039] Figure 5 A flow chart of a gas well drainage production management method based on optical fiber monitoring provided by the present invention;

[0040] Figure 6 A schematic diagram of the structure of a gas well drainage production management system based on optical fiber monitoring provided by the present invention;

[0041] Reference numerals:

[0042] Oil pipe-1; optical fiber-2; gas reservoir-3; pressure reducing valve-4; filtered water tank-5; solenoid valve group-6; electronic controller-7; low-pressure source pipeline-8; feedback signal line-9. DETAILED DESCRIPTION

[0043] The present invention provides a gas well drainage production management method based on optical fiber monitoring, such as Figure 5 As shown, the following steps are included:

[0044] S1: Based on the optical fiber measurement method, the pressure data and temperature data corresponding to multiple depth points along each well section in the wellbore are obtained.

[0045] The specific steps of obtaining pressure data and temperature data include:

[0046] A fiber optic monitor is placed in the wellbore, and optical fiber is used to collect pressure and temperature data corresponding to different depths from the bottom of the well to the wellhead.

[0047] S2: Based on the pressure data and temperature data, the gas-liquid flow state in the wellbore is analyzed to obtain the flow state change characteristics and gas-liquid distribution results.

[0048] The specific steps for analyzing the gas-liquid flow pattern in the wellbore include:

[0049] Based on the pressure data and temperature data, the pure liquid phase, pure gas phase and two-phase flow transition zone in the wellbore are analyzed, evaluated, judged and displayed to obtain the flow change characteristics and gas-liquid distribution results; wherein the two-phase flow transition zone includes bubbly flow, mist flow and gas-liquid mixed flow.

[0050] Specifically, the flow state change characteristics include the flow state change characteristics of "no liquid-carrying liquid-liquid accumulation", and the instantaneous oil-casing pressure difference gas production curve of gas well liquid accumulation is obtained according to the flow state change characteristics; and the distribution model is established according to the instantaneous oil-casing pressure difference gas production curve of gas well liquid accumulation.

[0051] S3: Establish a distribution model based on the flow pattern change characteristics, combine the gas-liquid distribution results, analyze the ability of gas in the gas well to lift the liquid and determine the discharge time of the accumulated liquid, and obtain the critical liquid carrying energy and liquid accumulation information.

[0052] The liquid accumulation information includes the gas-liquid flow state, liquid accumulation state and liquid accumulation position in the wellbore.

[0053] S4: According to the critical liquid carrying energy and liquid accumulation information, the production system is automatically adjusted in combination with the gas well information, and the status instruction is output to the remote well switch device. The gas well information here includes the gas well bore information, gas production information and formation pressure information.

[0054] Specifically, the production system is automatically adjusted according to the critical liquid carrying energy and liquid accumulation information in combination with the gas well information to obtain the best intermittent switching well production system; status instructions are generated according to the best intermittent switching well production system; the status instructions are sent to the remote switching well device to control the gas well to perform production management.

[0055] S5: The remote well switch device controls the gas well to perform production management according to the status instructions.

[0056] like Figure 6 As shown, the present invention also provides a gas well drainage production management system based on optical fiber monitoring, comprising:

[0057] The data acquisition module is used to obtain the pressure data and temperature data corresponding to multiple depth points in each well section along the wellbore based on the optical fiber measurement method; the analysis module is used to analyze the transition zone in the wellbore according to the pressure data and temperature data to obtain the flow state change characteristics and gas-liquid distribution results; the model establishment module is used to establish a distribution model according to the flow state change characteristics, and analyze the ability of the gas in the gas well to lift the liquid and determine the discharge time of the accumulated liquid in combination with the gas-liquid distribution results, and obtain the critical liquid carrying energy and liquid accumulation information; the instruction output module is used to automatically adjust the production system according to the critical liquid carrying energy and liquid accumulation information in combination with the gas well information, and output the status instruction to the remote well switching device; the instruction execution module is used for the remote well switching device to control the gas well to execute production management according to the status instruction.

[0058] The present invention also provides a device, comprising: a memory for storing a computer program; a processor for implementing the steps of the gas well drainage production management method based on optical fiber monitoring when executing the computer program.

[0059] When the processor executes the computer program, the steps of the above-mentioned gas well drainage production management based on optical fiber monitoring are implemented, for example: based on the optical fiber measurement method, the pressure data and temperature data corresponding to multiple depth points along each well section in the wellbore are obtained; based on the pressure data and temperature data, the transition zone in the wellbore is analyzed to obtain the flow state change characteristics and the gas-liquid distribution results; according to the flow state change characteristics, a distribution model is established, and in combination with the gas-liquid distribution results, the ability of the gas in the gas well to lift the liquid is analyzed and the discharge time of the accumulated liquid is determined to obtain the critical liquid carrying energy and liquid accumulation information; according to the critical liquid carrying energy and the liquid accumulation information, the production system is automatically adjusted in combination with the gas well information, and the status instruction is output to the remote well switching device; the remote well switching device controls the gas well to perform production management according to the status instruction.

[0060] Alternatively, when the processor executes the computer program, the functions of each module in the above system are realized, for example:

[0061] The data acquisition module is used to obtain the pressure data and temperature data corresponding to multiple depth points in each well section along the wellbore based on the optical fiber measurement method; the analysis module is used to analyze the transition zone in the wellbore according to the pressure data and temperature data to obtain the flow state change characteristics and gas-liquid distribution results; the model establishment module is used to establish a distribution model according to the flow state change characteristics, and analyze the ability of the gas in the gas well to lift the liquid and determine the discharge time of the accumulated liquid in combination with the gas-liquid distribution results, and obtain the critical liquid carrying energy and liquid accumulation information; the instruction output module is used to automatically adjust the production system according to the critical liquid carrying energy and liquid accumulation information in combination with the gas well information, and output the status instruction to the remote well switching device; the instruction execution module is used for the remote well switching device to control the gas well to execute production management according to the status instruction.

[0062] Exemplarily, the computer program may be divided into one or more modules / units, which are stored in the memory and executed by the processor to complete the present invention. The one or more modules / units may be a series of computer program instruction segments capable of completing preset functions, and the instruction segments are used to describe the execution process of the computer program in the gas well drainage production management device based on optical fiber monitoring. For example, the computer program can be divided into a data acquisition module, an analysis module, a model building module, an instruction output module and an instruction execution module; the specific functions of each module are as follows: a data acquisition module, which is used to obtain the pressure data and temperature data corresponding to multiple depth points along each well section in the wellbore based on the optical fiber measurement method; an analysis module, which is used to analyze the transition zone in the wellbore according to the pressure data and temperature data, and obtain the flow state change characteristics and the gas-liquid distribution results; a model building module, which is used to establish a distribution model according to the flow state change characteristics, and analyze the ability of the gas in the gas well to lift the liquid and determine the discharge time of the accumulated liquid in combination with the gas-liquid distribution results, and obtain the critical liquid carrying energy and liquid accumulation information; an instruction output module, which is used to automatically adjust the production system according to the critical liquid carrying energy and liquid accumulation information, combined with the gas well information, and output the status instruction to the remote well switching device; an instruction execution module, which is used for the remote well switching device to control the gas well to perform production management according to the status instruction.

[0063] The gas well drainage production management equipment based on optical fiber monitoring can be a computing device such as a desktop computer, a notebook, a PDA, and a cloud server. The gas well drainage production management equipment based on optical fiber monitoring may include, but is not limited to, a processor and a memory. Those skilled in the art will understand that the above is an example of a gas well drainage production management equipment based on optical fiber monitoring, and does not constitute a limitation on the gas well drainage production management equipment based on optical fiber monitoring, and may include more components than the above, or a combination of certain components, or different components. For example, the gas well drainage production management equipment based on optical fiber monitoring may also include input and output devices, network access devices, buses, etc.

[0064] The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc. The processor is the control center of the gas well drainage production management based on optical fiber monitoring, and uses various interfaces and lines to connect various parts of the entire gas well drainage production management equipment based on optical fiber monitoring.

[0065] The memory can be used to store the computer program and / or module, and the processor implements various functions of the gas well drainage production management equipment based on optical fiber monitoring by running or executing the computer program and / or module stored in the memory and calling the data stored in the memory.

[0066] The memory may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area may store data created according to the use of the mobile phone (such as audio data, a phone book, etc.), etc. In addition, the memory may include a high-speed random access memory, and may also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0067] The present invention also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the steps of the gas well drainage production management method based on optical fiber monitoring are implemented.

[0068] If the integrated module / unit of the gas well drainage production management system based on optical fiber monitoring is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium.

[0069] Based on such understanding, the present invention implements all or part of the processes in the above-mentioned gas well drainage production management method based on optical fiber monitoring, and can also be completed by instructing related hardware through a computer program, and the computer program can be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the above-mentioned gas well drainage production management method based on optical fiber monitoring can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or preset intermediate form, etc.

[0070] The computer-readable storage medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0071] It should be noted that the content contained in the computer-readable storage medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable storage media do not include electrical carrier signals and telecommunication signals.

[0072] Example

[0073] The present invention will be further described below in conjunction with the embodiments and drawings:

[0074] In order to solve the technical problem mentioned in the background technology that the existing monitoring means cannot accurately grasp the distribution of liquid accumulation and pressure inside the gas well, resulting in the inability to accurately formulate and implement the intermittent production system of the gas well, this embodiment provides a gas well drainage production management method based on optical fiber monitoring. This method can timely and accurately grasp the distribution of liquid accumulation and pressure inside the gas well, form a lifting capacity analysis result, guide the operation of the remote well switching device, realize the accurate formulation and implementation of the intermittent production system of the gas well, improve production efficiency, increase gas reservoir recovery rate, and reduce labor.

[0075] The principle on which this method is based is as follows:

[0076] First, optical fiber monitoring is used to reflect the distribution of liquid accumulation and pressure inside the wellbore, and the flow state is fully utilized to judge the rationality of the gas well production system. In conjunction with the remote well opening and closing device, the production system can be automatically adjusted in time to give full play to the gas well production capacity, improve the cumulative recovery rate and output of the gas well, extend the effective production time of the gas well, and reduce the labor intensity. The above principle is exactly the inventive point of this application.

[0077] The present embodiment provides a gas well drainage production management method based on optical fiber monitoring. In the present embodiment, a gas well intelligent intermittent drainage production management method integrating remote well switching and optical fiber monitoring for an intermittent production gas well is taken as an example. When a gas well is adjusted from a continuous drainage production period to an intermittent pressure recovery drainage production period, an optical fiber monitoring is lowered into the oil pipe. The optical fiber monitoring is used to reflect the distribution of liquid accumulation and pressure in each well section along the wellbore. The flow state change is used to analyze the ability of the gas in the gas well to lift the liquid, and it is determined whether the accumulated liquid can be discharged and under which production system it can be discharged. The remote well switching device is linked to automatically adjust the production system in time to ensure that the gas well can produce normally, give full play to the gas well production capacity, improve the cumulative recovery rate and output of the gas well, extend the effective production time of the gas well, and reduce the intensity of manual labor.

[0078] Step 1: If Figure 2 As shown, an optical fiber 2 is lowered into the oil pipe 1 for monitoring. Below the oil pipe 1 is a gas reservoir 3. The optical fiber 2 in the pipe string is used to measure the temperature and pressure distribution at different depths along the wellbore from the bottom of the well to the wellhead. Here, the measurement accuracy is a spatial resolution of 1m, that is, the interval between two depth points is 1m, which ensures the accuracy of the measurement data, thereby improving the precision.

[0079] Step 2: If Figure 1 As shown in the figure, by feeding back the pressure and temperature data of each section along the wellbore to the wellhead analysis system, accurate analysis, evaluation, judgment and display of pure liquid phase, pure gas phase and two-phase flow transition zone in the wellbore are carried out to form the flow state change characteristics of "no liquid-carrying liquid-liquid accumulation" in the wellbore, such as Figure 3 Through analysis and identification, the instantaneous oil-casing pressure difference gas production curve and gas-liquid distribution results of gas well liquid accumulation are obtained; among them, the two-phase flow transition zone includes bubbly flow, mist flow, gas-liquid mixed flow, etc.

[0080] Step 3: Use the instantaneous oil-casing pressure difference gas production curve model (distribution model) of the gas well liquid accumulation obtained in step 2, and calculate and evaluate the critical liquid carrying energy of the wellbore. Use the model and the gas-liquid distribution results in the wellbore to determine the state and location of the wellbore liquid accumulation.

[0081] Step 4: Based on the liquid accumulation situation (liquid accumulation state and location) and critical liquid carrying energy in the gas well bore monitored by the optical fiber, combined with the gas production of the gas well, formation pressure, etc., an optimal intermittent well switching production system is formed intelligently, and the instruction (status instruction generated according to the optimal intermittent well switching production system) is sent to the remote well switching device, such as Figure 4 As shown, it ensures that the gas well can produce stably and efficiently for a long time.

[0082] Figure 4In the figure, the electronic controller 7 of the remote well switching device receives the status instruction and feeds it back to the gas well through the feedback signal line 9; the gas well adopts the pressure reducing valve 4, the filtered water tank 5 and the solenoid valve group 6 to complete the subsequent production work; the gas well is connected to the remote well switching device through the low-pressure source pipeline 8; it should be noted here that the above-mentioned gas well drainage production management method based on optical fiber monitoring is adopted to output the status instruction, and the remote well switching device completes the subsequent related production management process according to the received status instruction.

[0083] In summary, this embodiment collects pressure data and temperature data corresponding to multiple depth points in the wellbore through optical fiber measurement, and then analyzes the transition zone in the wellbore to obtain flow pattern change characteristics and gas-liquid distribution results. A distribution model is established through flow pattern change characteristics and combined with gas-liquid distribution results to obtain critical liquid carrying energy and liquid accumulation information. Finally, through critical liquid carrying energy and liquid accumulation information, combined with gas well information, state instructions are output to enable the gas well to complete production management according to the state instructions. It has the following advantages:

[0084] This method is used to achieve the intelligent and precise formulation and implementation of the intermittent switching system of gas wells, improve the accuracy, effectiveness and timeliness of the intermittent production system of gas wells, improve the liquid carrying efficiency of gas well production and gas reservoir recovery rate, and significantly reduce the amount of labor.

[0085] The above embodiment is only one of the implementation methods that can realize the technical solution of the present invention. The scope of protection claimed by the present invention is not limited only to this embodiment, but also includes changes, replacements and other implementation methods that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention.

Claims

1. A gas well drainage production management method based on optical fiber monitoring, characterized in that: include: Based on the optical fiber measurement method, the pressure and temperature data corresponding to multiple depth points along each well section in the wellbore are obtained; According to the pressure data and temperature data, the gas-liquid flow pattern in the wellbore is analyzed to obtain the flow pattern change characteristics and gas-liquid distribution results; A distribution model is established based on the flow pattern change characteristics. Combined with the gas-liquid distribution results, the ability of gas in the gas well to lift liquid is analyzed and the discharge time of accumulated liquid is determined to obtain the critical liquid carrying energy and accumulated liquid information. According to the critical liquid carrying energy and liquid accumulation information, the production system is automatically adjusted in combination with the gas well information, and the status instructions are output to the remote well opening and closing device; The remote well switching device controls the gas well to perform production management according to the status instructions.

2. A gas well drainage production management method based on optical fiber monitoring according to claim 1, characterized in that: The specific steps to obtain pressure data and temperature data include: A fiber optic monitor is placed in the wellbore, and optical fiber is used to collect pressure and temperature data corresponding to different depths from the bottom of the well to the wellhead.

3. A gas well drainage production management method based on optical fiber monitoring according to claim 1, characterized in that: The specific steps for analyzing the gas-liquid flow pattern in the wellbore include: Based on the pressure data and temperature data, the pure liquid phase, pure gas phase and two-phase flow transition zone in the wellbore are analyzed, evaluated, judged and displayed to obtain the flow change characteristics and gas-liquid distribution results; wherein the two-phase flow transition zone includes bubbly flow, mist flow and gas-liquid mixed flow.

4. A gas well drainage production management method based on optical fiber monitoring according to claim 1, characterized in that: The flow pattern change characteristics include the flow pattern change characteristics of "no liquid-carrying liquid-liquid accumulation". The instantaneous oil-casing pressure difference gas production curve of gas well liquid accumulation is obtained according to the flow pattern change characteristics; and the distribution model is established according to the instantaneous oil-casing pressure difference gas production curve of gas well liquid accumulation.

5. A gas well drainage production management method based on optical fiber monitoring according to claim 1, characterized in that: The liquid accumulation information includes the gas-liquid flow state, liquid accumulation state and liquid accumulation position in the wellbore.

6. A gas well drainage production management method based on optical fiber monitoring according to claim 1, characterized in that: According to the critical liquid carrying energy and liquid accumulation information, the production system is automatically adjusted in combination with the gas well information to obtain the best intermittent well switching production system; the status instructions are generated according to the best intermittent well switching production system; the status instructions are sent to the remote well switching device to control the gas well to perform production management.

7. A gas well drainage production management method based on optical fiber monitoring according to claim 1, characterized in that: The gas well information includes gas well bore information, gas production information and formation pressure information.

8. A gas well drainage production management system based on optical fiber monitoring, used to implement the steps of the gas well drainage production management method based on optical fiber monitoring according to any one of claims 1 to 7, characterized in that: include: A data acquisition module is used to obtain pressure data and temperature data corresponding to multiple depth points along each well section in the wellbore based on an optical fiber measurement method; The analysis module is used to analyze the transition zone in the wellbore based on the pressure data and temperature data to obtain the flow pattern change characteristics and gas-liquid distribution results; The model building module is used to establish a distribution model based on the flow pattern change characteristics, analyze the gas lifting liquid ability in the gas well and determine the discharge time of the accumulated liquid in combination with the gas-liquid distribution results, and obtain the critical liquid carrying energy and liquid accumulation information; The command output module is used to automatically adjust the production system according to the critical liquid carrying energy and liquid accumulation information in combination with the gas well information, and output the status command to the remote well opening and closing device; The instruction execution module is used for the remote well switch device to control the gas well to execute production management according to the status instruction.

9. A device, characterized in that: include: Memory for storing computer programs; A processor is used to implement the steps of the gas well drainage production management method based on optical fiber monitoring as described in any one of claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, it is used to implement the steps of the gas well drainage production management method based on optical fiber monitoring as described in any one of claims 1 to 7.

Images