A method and device for accurately injecting hydrate inhibitor into a natural gas pipeline

Abstract

The present invention provides a method and device for accurately injecting a hydrate inhibitor into a natural gas pipeline, which relates to the technical field of natural gas pipeline dredging. Based on pipeline wiring information and pipeline attribute information of a target natural gas pipeline, a liquid water detection data set and a pipeline water content prediction result are obtained, and it is further determined whether to activate the injection device. If the injection device is activated, the water content prediction result is analyzed according to a flow conversion model embedded in the injection device to obtain the inhibitor injection flow, and then the injection device is started to perform the inhibitor injection operation. The method solves the technical problems in the prior art that the hydrate inhibition effect may be affected to a certain extent due to the injection method and injection amount ratio of the inhibitor being not rigorous enough, and there may be a waste of the inhibitor, and realizes the automatic detection, analysis and regulation of pipeline hydrates.

Description

Technical Field

[0001] The present invention relates to the technical field of natural gas pipeline dredging, and in particular to a method and device for accurately injecting hydrate inhibitors into a natural gas pipeline. Background Art

[0002] Nowadays, natural gas pipelines are basically fully covered. During the natural gas transportation process, the formation of hydrates in the pipelines will cause pipeline blockage, affecting the normal transmission of natural gas and posing a safety hazard. Currently, the main way to deal with pipeline liquid accumulation is to add drainage agents or hydrate inhibitors into the natural gas pipelines. However, due to the limitations of technical methods, hydrates in the pipelines cannot be optimally controlled, posing a potential threat.

[0003] In the prior art, when inhibiting hydrate formation in natural gas pipelines, the injection method and injection amount ratio of the inhibitor are not rigorous enough, which will affect the hydrate inhibition effect to a certain extent and may also result in a waste of inhibitor. Summary of the invention

[0004] The present application provides a method and device for accurately injecting hydrate inhibitors into a natural gas pipeline, which is used to solve the technical problems in the prior art that the injection method and injection amount ratio of the inhibitor are not strict enough, which will affect the hydrate inhibition effect to a certain extent and may cause waste of inhibitors.

[0005] In view of the above problems, the present application provides a method and device for precise injection of hydrate inhibitors in a natural gas pipeline.

[0006] In a first aspect, the present application provides a method for precise injection of hydrate inhibitors in a natural gas pipeline, the method comprising: obtaining pipeline wiring information and pipeline attribute information of a target natural gas pipeline; assembling the front-end detector according to the pipeline wiring information, for performing liquid water detection on the target natural gas pipeline, and obtaining a liquid water detection data set; using the liquid water detection data set and the pipeline attribute information as data, performing unit water content prediction, and obtaining a water content prediction result, wherein the unit water content prediction is the water content in a unit length of the pipeline; judging whether to activate the injection device according to the water content prediction result, wherein the injection device is connected to the front-end detector through a connecting rod, and information can be exchanged; if the injection device is activated, analyzing the water content prediction result according to a flow conversion model embedded in the injection device, and obtaining an inhibitor injection flow; and starting the injection device to perform an inhibitor injection operation according to the inhibitor injection flow.

[0007] In a second aspect, the present application provides a natural gas pipeline hydrate inhibitor precision injection device, the device comprising: an information acquisition module, the information acquisition module is used to obtain the pipeline wiring information and pipeline attribute information of the target natural gas pipeline; a liquid water detection module, the liquid water detection module is used to assemble the front-end detector according to the pipeline wiring information, and is used to perform liquid water detection on the target natural gas pipeline to obtain a liquid water detection data set; a water content prediction module, the water content prediction module is used to perform unit water content prediction based on the liquid water detection data set and the pipeline attribute information as data, and obtain a water content prediction result, wherein , the unit water content prediction is the water content in the unit length of the pipeline; a result judgment module, the result judgment module is used to judge whether to activate the injection device according to the water content prediction result, wherein the injection device is connected to the front-end detector through a connecting rod, and the information can be exchanged; a result analysis module, the result analysis module is used to analyze the water content prediction result according to the flow conversion model embedded in the injection device if the injection device is activated, and obtain the inhibitor injection flow; an operation start module, the operation start module is used to start the injection device to perform the inhibitor injection operation according to the inhibitor injection flow.

[0008] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0009] The embodiment of the present application provides a method for precise injection of hydrate inhibitors into a natural gas pipeline, which includes obtaining pipeline wiring information and pipeline attribute information of a target natural gas pipeline, assembling the front-end detector to perform liquid water detection on the target natural gas pipeline, and obtaining a liquid water detection data set; using the liquid water detection data set and the pipeline attribute information as data, determining a water content prediction result, wherein the unit water content prediction is the water content in a unit length of the pipeline, and further determining whether to activate the injection device, wherein the injection device is connected to the front-end detector through a connecting rod, and information can be exchanged; if the injection device is activated, analyzing the water content prediction result according to a flow conversion model embedded in the injection device, obtaining the inhibitor injection flow, and then starting the injection device to perform the inhibitor injection operation, thereby solving the technical problems in the prior art that the inhibitor injection method and injection amount ratio are not rigorous enough, which may affect the hydrate inhibition effect to a certain extent, and there may be a waste of inhibitors, and realizing automatic detection, analysis and regulation of pipeline hydrates. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 A schematic flow chart of a method for precise injection of hydrate inhibitors into a natural gas pipeline is provided for this application;

[0011] Figure 2A schematic diagram of an inhibitor injection process in a method for precise injection of hydrate inhibitors in a natural gas pipeline is provided for this application;

[0012] Figure 3 A schematic diagram of a flow chart for obtaining the injection flow rate of an inhibitor in a method for accurately injecting hydrate inhibitors into a natural gas pipeline is provided for this application;

[0013] Figure 4 A schematic structural diagram of a natural gas pipeline hydrate inhibitor precision injection device is provided for this application.

[0014] Explanation of the reference numerals: information acquisition module a, liquid water detection module b, water content prediction module c, result judgment module d, result analysis module e, operation start module f. DETAILED DESCRIPTION

[0015] The present application provides a method and device for accurately injecting hydrate inhibitors into a natural gas pipeline, so as to solve the technical problems in the prior art that the injection method and injection amount ratio of the inhibitor are not strict enough, which will affect the hydrate inhibition effect to a certain extent and may cause waste of inhibitors.

[0016] Embodiment 1

[0017] like Figure 1 As shown, the present application provides a method for precise injection of hydrate inhibitors into a natural gas pipeline, the method is applied to a precise injection device for hydrate inhibitors into a natural gas pipeline, the device is communicatively connected with a front-end detector and an injection device, and the method includes:

[0018] Step S100: Obtaining pipeline wiring information and pipeline attribute information of a target natural gas pipeline;

[0019] Specifically, the present application provides a method for precise injection of hydrate inhibitors into a natural gas pipeline. The method determines the inhibitor ratio of hydrates in the pipeline and further injects the inhibitor based on an injection device to achieve hydrate regulation. First, the pipeline wiring information and pipeline attribute information of the target natural gas pipeline are collected. The pipeline wiring information includes line arrangement, line selection, etc. There are differences in the selection of gas pipelines under different geological structures and environments. For example, ground obstacles and low pipelines, hills, rivers and other complex terrains will affect the routing distribution of natural gas pipelines. The pipeline attribute information includes the type, specification, melt flow rate, material, wall thickness, pipe diameter, length, etc. of the pipeline. The above information is integrated and processed, and further stored in the system to facilitate extraction and call during subsequent pipeline analysis.

[0020] Step S200: assembling the front-end detector according to the pipeline wiring information to perform liquid water detection on the target natural gas pipeline and obtain a liquid water detection data set;

[0021] Specifically, based on the pipeline wiring information, the target natural gas pipeline is equipped with a front-end detector. Since liquid water present in the natural gas pipeline transmission process will react with natural gas to form hydrates, which will cause blockage of the natural gas pipeline, detection and control of the liquid water content in the pipeline is inevitably an effective method to alleviate pipeline blockage. The front-end detector can detect the liquid water content in the pipeline during operation. Exemplarily, the front-end detector can be equipped with a visualization lens or infrared rays to monitor whether there is liquid water in the target pipeline online in real time, obtain the liquid water content and distribution of multiple pipelines in the target natural gas pipeline, further classify and integrate relevant information data, obtain the liquid water detection data set, and store the liquid water detection data set as real-time parameter information, which provides a basic basis for suppressing the generation of liquid water.

[0022] Step S300: using the liquid water detection data set and the pipeline attribute information as data, performing unit water content prediction to obtain a water content prediction result, wherein the unit water content prediction is the water content in a unit length of the pipeline;

[0023] Specifically, based on the liquid water detection data set and the pipeline attribute information, the liquid water detection data of multiple pipelines of the target natural gas pipeline are matched and mapped to obtain the liquid water detection data of the multiple pipelines. Furthermore, the pipeline attribute information corresponding to the multiple natural gas pipelines is determined. For different transmission locations and different transmission environments, the configured natural gas pipelines should be compatible with the real-time location information. For example, there are requirements for the material and pressure resistance of the natural gas pipelines configured in areas with high soil moisture and complex terrain. The increase in pipeline inflection points will also cause liquid water backlog. Based on the liquid water detection data set and the pipeline attribute information, the liquid water content in the unit length of the pipeline is predicted, and the water content prediction result is obtained. The subsequent inhibitor injection device is set based on the water content prediction result to control the water content of the natural gas pipeline.

[0024] Furthermore, step S300 of the present application also includes:

[0025] Step S310: if the liquid water detection data set does not generate data changes, determine whether it is abnormal, and if it is abnormal, obtain detection warning information, wherein the detection warning information is used to remind the front-end detector to detect abnormalities;

[0026] Step S320: If no abnormality is displayed, obtain a device locking instruction, and close the injection device according to the device locking instruction.

[0027] Specifically, when the front-end detector performs pipeline liquid water detection, if there is no data fluctuation in the liquid water detection data set within a certain period of time and the detection data remains unchanged, it means that there is no liquid water in the pipeline, and the front-end detector is further judged for detection abnormality. Since in the process of natural gas pipeline liquid water detection and control, corresponding devices will inevitably have faults. If the front-end detector has detection abnormality, the detection early warning information is obtained for abnormal detection warning, and abnormality is checked based on the detection early warning information to make corresponding adjustments to continue subsequent operations. When no abnormality is displayed, it means that the liquid water content in the natural gas pipeline meets the standard, and the device locking instruction is obtained. With the receipt of the device locking instruction, the water injection device is closed to stop the injection of inhibitors.

[0028] Step S400: judging whether to activate the injection device according to the water content prediction result, wherein the injection device is connected to the front-end detector through a connecting rod, and information can be exchanged;

[0029] Specifically, the injection device is used to inject inhibitors to slow down the generation of liquid water in the natural gas pipeline. The water content prediction result of the unit length of the pipeline is used as a judgment basis to determine whether the injection device is activated. The injection device is connected to the front-end detector through a connecting rod and can exchange information to receive the pipeline water content prediction result obtained by the front-end detector and preset the liquid water content. The preset liquid water content is a limit measurement value that limits whether liquid water generation is suppressed. The water content prediction results in multiple pipelines are compared and analyzed with the preset liquid water content. Based on the liquid water content comparison result, it is determined whether the injection device is activated. If the water content prediction result is less than the preset liquid water content, the injection device is kept in a closed state. If the water content prediction result is greater than or equal to the preset liquid water content, the injection device is activated to adjust and control the liquid water content of the natural gas pipeline.

[0030] Furthermore, if Figure 2 As shown, step S400 of the present application also includes:

[0031] Step S410: acquiring detection records of liquid water in each pipeline according to the pipeline wiring information;

[0032] Step S420: acquiring N pipelines having a liquid water content greater than or equal to a preset liquid water content by analyzing the detection records of the liquid water in each pipeline;

[0033] Step S430: Analyzing the N pipelines, respectively configuring a plurality of corresponding injection devices, wherein each of the N pipelines includes a plurality of injection devices;

[0034] Step S440: using the multiple groups of injection devices to implement inhibitor injection control for each of the N pipelines.

[0035] Specifically, based on the pipeline wiring information, matching mapping of the liquid water detection data set is performed to obtain the detection records of liquid water in each pipeline, wherein the detection records of liquid water in each pipeline correspond one-to-one to multiple pipeline wirings, and a preset liquid water content is preset. The detection records of liquid water in each pipeline are compared and analyzed with the preset liquid water content to determine N pipelines whose liquid water content is greater than or equal to the preset liquid water content. The N pipelines indicate that the liquid water content inside the pipeline exceeds the standard and there is a potential risk of pipeline blockage. The N pipelines are analyzed separately, and the injection device is configured based on the liquid water detection records in each pipeline. For each of the N pipelines, multiple groups of injection devices can be configured. The injection devices are equipped with inhibitors, which can adjust the liquid water content of the entire pipeline. By mixing the inhibitor with liquid water, the formation temperature of hydrates is reduced, thereby inhibiting the generation of the liquid water. For example, methanol and ethylene glycol can be used as inhibitors. When the water content prediction result determined by the front-end detector for pipeline liquid water detection and analysis meets the predetermined standard, the injection device is activated, and the injection speed is adjusted based on the determined inhibitor injection flow rate. The injection of the inhibitor is controlled for each of the N pipelines separately to inhibit the generation of liquid water inside the pipeline.

[0036] Furthermore, step S440 of the present application also includes:

[0037] Step S441: acquiring a first injection device, a second injection device, ... an Mth injection device according to the plurality of injection devices, wherein M is the number of devices in the plurality of injection devices;

[0038] Step S442: When the first injection device is in the injection completion state, the first injection device is closed, and the second injection device is opened, and so on, until the Mth injection device is in the injection completion state.

[0039] Specifically, the number of the multiple groups of injection devices is determined to be M, and a first injection device, a second injection device ... an Mth injection device are respectively set for each of the N pipelines, wherein the first injection device, the second injection device ... the Mth injection device represent the injection sequence of the injection devices. When the injection device is in an activated state, the first injection device starts to inject the inhibitor into the natural gas pipeline at a certain injection rate. When the first injection device is in an injection completion state, the first injection device is closed, and at the same time, the second injection device is opened to continuously transport the inhibitor, and so on. The above operation is repeated until the Mth injection device is in an injection completion state. By injecting the inhibitors into the N pipelines respectively using multiple groups of injection devices, the generation inhibition rate of liquid water in the pipeline can be effectively improved.

[0040] Furthermore, step S442 of the present application also includes:

[0041] Step S4421: when the Mth injection device is in the injection completion state, obtaining a position recording instruction;

[0042] Step S4422: collecting position data of the multiple groups of injection devices according to the position recording instruction to obtain real-time pipeline position information;

[0043] Step S4423: The real-time pipeline position information is stored, and when the inhibitor injection operation is performed again, it is used to guide the start of the multiple groups of injection devices to perform the inhibitor injection operation starting from the real-time pipeline position information.

[0044] Specifically, the inhibitors of multiple injection devices are sequentially injected into each of the N pipelines until the Mth injection device in each pipeline is in the injection completion state, and the position recording instruction is obtained, the position recording instruction refers to an instruction for starting to locate the position information of the multiple injection devices in each pipeline. With the issuance of the position recording instruction, the internal position information of the pipeline where the multiple groups of injection devices are located is collected, and the real-time position information of the multiple groups of injection devices is obtained to determine the real-time pipeline position information, and the real-time pipeline position information is further stored. When the liquid water content of the natural gas pipeline is detected to exceed the standard again, the inhibitor injection program is started again with the real-time pipeline position information as the starting point, and the above-mentioned inhibitor injection operation is continued until the liquid water content detected by the front-end detector is within the normal range, and the injection device is closed. This cycle is repeated to regulate the liquid water content in the natural gas pipeline.

[0045] Step S500: if the injection device is activated, the water content prediction result is analyzed according to the flow conversion model embedded in the injection device to obtain the inhibitor injection flow rate;

[0046] Step S600: according to the inhibitor injection flow rate, start the injection device to perform the inhibitor injection operation.

[0047] Specifically, when the water content detection result is greater than or equal to the preset liquid water content, the injection device is activated, and the optimal inhibition amount, that is, the mixing ratio of the inhibitor to the liquid water, is determined by performing a mixed degradation simulation analysis on the liquid water and the inhibitor in the pipeline. A flow conversion model is embedded in the injection device for performing geometric calculation of the inhibitor according to the detected liquid water content. Based on the flow conversion model, the proportional inhibitor injection setting is performed on the water content prediction result to obtain the required inhibitor configuration amount for the water content at different stages of the pipeline, which is used as the injection flow of the inhibitor. Further, based on the inhibitor injection flow as a standard, the injection device is started to perform the inhibitor injection operation until the liquid water in the natural gas pipeline is completely degraded. Then, a secondary detection of liquid water is performed based on the front-end detector, and the detection result is obtained as a feedback detection result to perform feedback adjustment of the pipeline liquid water. When there is still liquid water residual in the pipeline, the above operation is repeated to perform the dosage injection of the inhibitor. When the injection is completed, the injection device is closed to complete the liquid water generation inhibition in the natural gas pipeline.

[0048] Furthermore, if Figure 3 As shown, the water content prediction result is analyzed according to the flow conversion model embedded in the injection device to obtain the inhibitor injection flow rate. Step S500 of the present application also includes:

[0049] Step S510: obtaining inhibitor component information used for hydrate inhibition in the injection device;

[0050] Step S520: collecting liquid water samples from the target natural gas pipeline to obtain liquid water composition information;

[0051] Step S530: performing a mixing simulation according to the inhibitor component information and the liquid water component information to generate a preset mixing ratio;

[0052] Step S540: generating the flow conversion model according to the preset mixing ratio as a conversion condition of the flow conversion model, and embedding the flow conversion model into the injection device.

[0053] Specifically, the inhibitor component information used for hydrate inhibition in the injection device is collected, including the concentration and the inhibitor component. The liquid water generated in the target natural gas pipeline is further sampled, and the liquid water component information is obtained by performing sample analysis. The liquid water component information includes information of multiple elements, such as oxygen, methane, carbon dioxide, etc. A mixing simulation is performed based on the inhibitor component information and the liquid water component information to determine the generation inhibition ratio of the inhibitor to the liquid water. The optimal inhibition ratio of the inhibitor to the liquid water is obtained by performing multiple simulations and used as the preset mixing ratio. The inhibitor and the liquid water are mixed at the preset mixing ratio, which can inhibit the liquid water most efficiently and quickly. The preset mixing ratio is used as the conversion condition of the flow conversion model to generate the flow conversion model, and the flow conversion model is embedded in the injection device. As the injection device runs, the injection amount and injection rate of the inhibitor are controlled based on the water content prediction result to maximize the utilization of the inhibitor.

[0054] Furthermore, step S500 of the present application also includes:

[0055] Step S541: inputting the water content prediction result into the flow conversion model embedded in the injection device to obtain a flow conversion result, wherein the flow conversion result is the inhibitor injection flow;

[0056] Step S542: obtaining the feedback detection result of the front-end detector according to the inhibitor injection flow rate, wherein the feedback detection result is the feedback result of the change of the liquid water content in the pipeline after the inhibitor is injected;

[0057] Step S543: input the feedback detection result as feedback information into the injection device for feedback flow regulation.

[0058] Specifically, the water content of the natural gas pipeline is detected and analyzed by the front-end detector to obtain the water content prediction result, and the water content prediction result is further input into the flow conversion model embedded in the water injection device. The water content prediction result is matched with a geometric inhibitor based on the preset mixing ratio to obtain a corresponding inhibitor injection flow as the flow conversion result. The inhibitor is injected into the corresponding pipeline based on the flow conversion result as the inhibitor injection standard. When the natural gas pipeline is in a state where the inhibitor injection is completed, the pipeline water content is detected again based on the front-end detector to obtain a feedback detection result of the front-end detector. The feedback detection result expresses the liquid water content in the pipeline after the inhibitor is injected. The feedback detection result is further input into the injection device as feedback information for feedback adjustment. The inhibitor is injected in a geometric ratio based on the feedback detection result. By performing secondary feedback adjustment on the pipeline, the liquid water generation control of the natural gas pipeline can be effectively improved.

[0059] Embodiment 2

[0060] Based on the same inventive concept as the method for precise injection of hydrate inhibitors into a natural gas pipeline in the aforementioned embodiment, Figure 4 As shown, the present application provides a natural gas pipeline hydrate inhibitor precision injection device, the device comprising:

[0061] Information acquisition module a, the information acquisition module a is used to obtain pipeline wiring information and pipeline attribute information of the target natural gas pipeline;

[0062] A liquid water detection module b, wherein the liquid water detection module b is used to assemble the front-end detector according to the pipeline wiring information, and is used to perform liquid water detection on the target natural gas pipeline to obtain a liquid water detection data set;

[0063] A water content prediction module c, the water content prediction module c is used to perform unit water content prediction based on the liquid water detection data set and the pipeline attribute information, and obtain a water content prediction result, wherein the unit water content prediction is the water content in a unit length of the pipeline;

[0064] A result judgment module d, the result judgment module d is used to judge whether to activate the injection device according to the water content prediction result, wherein the injection device is connected to the front-end detector through a connecting rod, and information can be exchanged;

[0065] A result analysis module e, wherein if the injection device is activated, the result analysis module e is used to analyze the water content prediction result according to the flow conversion model embedded in the injection device to obtain the inhibitor injection flow rate;

[0066] An operation start module f is used to start the injection device to perform an inhibitor injection operation according to the inhibitor injection flow rate.

[0067] Furthermore, the device also includes:

[0068] A detection record acquisition module, the detection record acquisition module is used to acquire the detection record of liquid water in each pipeline according to the pipeline wiring information;

[0069] A detection record analysis module, the detection record analysis module is used to obtain N pipelines whose liquid water content is greater than or equal to a preset liquid water content by analyzing the detection records of liquid water in each pipeline;

[0070] A device configuration module, the device configuration module is used to configure corresponding multiple groups of injection devices respectively by analyzing the N pipelines, wherein each pipeline of the N pipelines includes multiple groups of injection devices;

[0071] A pipeline control module is used to implement inhibitor injection control for each of the N pipelines using the multiple groups of injection devices.

[0072] Furthermore, the device also includes:

[0073] A device acquisition module, the device acquisition module is used to acquire a first injection device, a second injection device ... an Mth injection device according to the multiple groups of injection devices, wherein M is the number of devices in the multiple groups of injection devices;

[0074] The device injection module is used to close the first injection device and open the second injection device when the first injection device is in the injection completion state, and so on, until the Mth injection device is in the injection completion state.

[0075] Furthermore, the device also includes:

[0076] An instruction acquisition module, the instruction acquisition module is used to acquire a position recording instruction when the Mth injection device is in an injection completion state;

[0077] A position information acquisition module, the position information acquisition module is used to collect position data of the multiple groups of injection devices according to the position recording instruction to obtain real-time pipeline position information;

[0078] An information guidance module is used to store the real-time pipeline position information, and when the inhibitor injection operation is performed again, it is used to guide the start of the multiple groups of injection devices to perform the inhibitor injection operation starting from the real-time pipeline position information.

[0079] Furthermore, the device also includes:

[0080] A data judgment module, the data judgment module is used to judge whether the display is abnormal if the liquid water detection data set does not produce data changes, and if it is abnormal, obtain detection warning information, wherein the detection warning information is used to remind the front-end detector to detect abnormalities;

[0081] A locking instruction acquisition module is used to acquire a device locking instruction if no abnormality is displayed, and to close the injection device according to the device locking instruction.

[0082] Furthermore, the device also includes:

[0083] An inhibition information acquisition module, the inhibition information acquisition module is used to obtain inhibitor component information used for hydrate inhibition in the injection device;

[0084] A sample collection module, the sample collection module is used to collect liquid water samples from the target natural gas pipeline to obtain liquid water composition information;

[0085] An information simulation module, the information simulation module is used to perform a mixing simulation according to the inhibitor component information and the liquid water component information to generate a preset mixing ratio;

[0086] A model generation module is used to generate the flow conversion model according to the preset mixing ratio as the conversion condition of the flow conversion model, and embed the flow conversion model into the injection device.

[0087] Furthermore, the device also includes:

[0088] A flow conversion module, the flow conversion module is used to input the water content prediction result into the flow conversion model embedded in the injection device to obtain a flow conversion result, wherein the flow conversion result is the inhibitor injection flow;

[0089] A feedback detection module, the feedback detection module is used to obtain the feedback detection result of the front-end detector according to the inhibitor injection flow rate, wherein the feedback detection result is the feedback result of the change of the liquid water content in the pipeline after the inhibitor is injected;

[0090] A feedback regulation module is used to input the feedback detection result as feedback information into the injection device for performing feedback flow regulation.

[0091] Through the above-mentioned detailed description of a method for precise injection of hydrate inhibitors into a natural gas pipeline in this specification, those skilled in the art can clearly know a method and device for precise injection of hydrate inhibitors into a natural gas pipeline in this embodiment. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0092] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for precise injection of hydrate inhibitors in a natural gas pipeline, characterized in that: The method is applied to a natural gas pipeline hydrate inhibitor precision injection device, the device is communicatively connected with a front-end detector and an injection device, and the method comprises: Obtain pipeline wiring information and pipeline attribute information of the target natural gas pipeline; Assembling the front-end detector according to the pipeline wiring information to perform liquid water detection on the target natural gas pipeline and obtain a liquid water detection data set; Using the liquid water detection data set and the pipeline attribute information as data, a unit water content prediction is performed to obtain a water content prediction result, wherein the unit water content prediction is the water content in a unit length of the pipeline; According to the water content prediction result, determining whether to activate the injection device, wherein the injection device is connected to the front-end detector through a connecting rod, and information can be exchanged; If the injection device is activated, the water content prediction result is analyzed according to the flow conversion model embedded in the injection device to obtain the inhibitor injection flow rate; According to the inhibitor injection flow rate, the injection device is started to perform the inhibitor injection operation.

2. The method according to claim 1, characterized in that The method further comprises: According to the pipeline wiring information, obtaining the detection record of liquid water in each pipeline; By analyzing the detection records of liquid water in each pipeline, N pipelines having a liquid water content greater than or equal to a preset liquid water content are obtained; By analyzing the N pipelines, corresponding multiple groups of injection devices are respectively configured, wherein each of the N pipelines includes multiple groups of injection devices; The multiple groups of injection devices are used to implement inhibitor injection control for each of the N pipelines.

3. The method according to claim 2, characterized in that The method further comprises: According to the multiple groups of injection devices, a first injection device, a second injection device, ... an Mth injection device are obtained, wherein M is the number of devices in the multiple groups of injection devices; When the first injection device is in the injection completion state, the first injection device is closed, and the second injection device is opened, and so on, until the Mth injection device is in the injection completion state.

4. The method according to claim 3, characterized in that The method further comprises: When the Mth injection device is in an injection completion state, obtaining a position recording instruction; Collecting position data of the multiple groups of injection devices according to the position recording instruction to obtain real-time pipeline position information; The real-time pipeline position information is stored, and when the inhibitor injection operation is performed again, it is used to guide the start of the multiple groups of injection devices to perform the inhibitor injection operation starting from the real-time pipeline position information.

5. The method according to claim 1, characterized in that The method further comprises: If the liquid water detection data set does not generate data changes, determine whether it is abnormal, and if it is abnormal, obtain detection warning information, wherein the detection warning information is used to remind the front-end detector to detect abnormalities; If no abnormality is displayed, a device locking instruction is obtained, and the injection device is closed according to the device locking instruction.

6. The method according to claim 1, characterized in that The water content prediction result is analyzed according to the flow conversion model embedded in the injection device to obtain the inhibitor injection flow rate. The method further includes: Acquiring inhibitor component information used for hydrate inhibition in the injection device; Collecting liquid water samples from the target natural gas pipeline to obtain liquid water composition information; Performing a mixing simulation according to the inhibitor component information and the liquid water component information to generate a preset mixing ratio; The flow conversion model is generated according to the preset mixing ratio as a conversion condition of the flow conversion model, and the flow conversion model is embedded in the injection device.

7. The method according to claim 6, characterized in that The method further comprises: Inputting the water content prediction result into the flow conversion model embedded in the injection device to obtain a flow conversion result, wherein the flow conversion result is the inhibitor injection flow; According to the inhibitor injection flow rate, obtaining the feedback detection result of the front-end detector, wherein the feedback detection result is the feedback result of the change of the liquid water content in the pipeline after the inhibitor is injected; The feedback detection result is input into the injection device as feedback information for feedback flow regulation.

8. A natural gas pipeline hydrate inhibitor precision injection device, characterized in that: The device is in communication with the front-end detector and the injection device, and the device comprises: An information acquisition module, wherein the information acquisition module is used to acquire pipeline wiring information and pipeline attribute information of a target natural gas pipeline; A liquid water detection module, the liquid water detection module is used to assemble the front-end detector according to the pipeline wiring information, and is used to perform liquid water detection on the target natural gas pipeline to obtain a liquid water detection data set; A water content prediction module, the water content prediction module is used to perform unit water content prediction based on the liquid water detection data set and the pipeline attribute information, and obtain a water content prediction result, wherein the unit water content prediction is the water content in a unit length of the pipeline; A result judgment module, the result judgment module is used to judge whether to activate the injection device according to the water content prediction result, wherein the injection device is connected to the front-end detector through a connecting rod, and information can be exchanged; A result analysis module, wherein if the injection device is activated, the result analysis module is used to analyze the water content prediction result according to a flow conversion model embedded in the injection device to obtain an inhibitor injection flow rate; An operation start module is used to start the injection device to perform an inhibitor injection operation according to the inhibitor injection flow rate.

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