An integrated equipment for high-efficiency dehydration of natural gas at oilfield wellheads

Abstract

This invention provides an integrated high-efficiency natural gas dehydration system for oilfield wellheads, comprising: a delivery and valve system consisting of parallel main and backup pipelines and corresponding main and backup valves; a core processing module including a pressure tank and its internal polymer dehydration components; a water collection and drainage module connected to the bottom water inlet of the pressure tank; and a monitoring and control module consisting of a controller, a pressure tank outlet humidity sensor, and pressure sensors downstream of the main / backup valves. When the controller detects a sudden drop in pressure in the main pipeline or a continuous increase in humidity after dehydration, it first opens the backup valve, and then closes the main valve once the pressure difference between the two pipelines is less than a preset value, thus enabling maintenance or replacement without interrupting gas supply. This invention solves at least one of the technical problems of existing equipment: insufficient dehydration efficiency and material compatibility, the need to interrupt gas supply for maintenance, single monitoring parameters and delayed response, and the inability of cross-domain backup channels to adapt to high-pressure natural gas dehydration conditions.

Description

Technical Field

[0001] This invention relates to the technical field of natural gas gathering and transportation systems at oilfield wellheads, and particularly to an integrated equipment for efficient dehydration of natural gas at oilfield wellheads. Background Technology

[0002] Natural gas extracted from oilfield wellheads has a high moisture content, making pipelines prone to freezing and blockage in low winter temperatures. Existing dehydration equipment generally suffers from inadequate materials and efficiency: traditional dehydration components have limited adsorption capacity (e.g., the dew point after dehydration is only ≥-10℃), making them unsuitable for the high-pressure (operating pressure 0.6MPa) and wide-temperature range (-30℃ to 60℃) conditions of oilfields. Furthermore, most equipment uses a single main pipeline for transport without backup channels, requiring gas supply to be interrupted during maintenance, severely impacting the continuity and economic viability of production.

[0003] In terms of control and monitoring, the monitoring parameters are limited (pressure only), lacking humidity and temperature monitoring, making it impossible to predict the risk of freezing and cracking, and resulting in a significant lag in manual response. Other "backup valve + parallel pipeline" designs (such as electronic gas supply and electro-hydraulic control) cannot be directly adapted to high-pressure natural gas dehydration scenarios due to their low pressure levels (e.g., ≤0.1MPa) or different process principles, and are also not coordinated with the maintenance needs of the dehydration components.

[0004] In summary, during the process of realizing this invention, the inventors discovered at least the following problems: Insufficient dehydration efficiency and material compatibility: Limited adsorption capacity, making it difficult to adapt to oilfield working conditions.

[0005] Poor structural continuity: There is no backup gas supply channel, maintenance requires gas outage, and switching stability is poor.

[0006] Limited monitoring and delayed control: Only pressure is monitored, without humidity or temperature monitoring, resulting in a delayed response.

[0007] Cross-domain backup designs cannot be reused: Parallel structures for low-pressure or different process scenarios are not suitable for natural gas dehydration conditions at oilfield wellheads. Summary of the Invention

[0008] The purpose of this invention is to provide an integrated equipment for efficient dehydration of natural gas at oilfield wellheads, which solves at least one of the following technical problems in existing natural gas dehydration equipment at oilfield wellheads: insufficient dehydration efficiency and material compatibility, the need to interrupt gas transmission for maintenance, single monitoring and control parameters with delayed response, and the inability of cross-domain backup channel design to adapt to high-pressure natural gas dehydration conditions.

[0009] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows: This invention provides an integrated equipment for efficient dehydration of natural gas at oilfield wellheads, comprising: A conveying and valve system includes a main pipeline and a backup pipeline connected in parallel. The main pipeline is equipped with a main valve at its inlet end, and the backup pipeline is equipped with a backup valve at its inlet end. The outlet ends of both the main pipeline and the backup pipeline are connected to a downstream pipeline. The core processing module includes a pressure tank connected to the main pipeline and a polymer dehydration component installed in the pressure tank. The polymer dehydration component is used to centrifuge and dehydrate the water in the wellhead natural gas. A water collection and drainage module is located at the lower part of the pressure tank and is connected to the recessed water inlet at the bottom of the pressure tank. The monitoring and control module includes a controller, a humidity sensor installed on the outlet pipe of the pressure tank, and pressure sensors respectively installed at the front ends of the two pipes. The pressure sensors are located on the pipes downstream of the main valve and the backup valve. The controller is configured to execute a valve switching procedure when a pressure sensor detects a sudden drop in the pressure of the main pipeline or a continuous increase in the humidity of the natural gas after dehydration. The valve switching procedure includes: controlling the standby valve to open, and controlling the main valve to close when the pressure difference between the two pipelines is less than a preset pressure value, so as to enable maintenance or replacement without interrupting gas supply.

[0010] Furthermore, the delivery and valve system also includes an adjustable throttle valve located at the outlet end of the backup pipeline; The controller is also configured to: after the backup valve is opened, synchronously adjust the opening of the throttle valve according to the deviation between the measured value of the pressure sensor on the backup pipeline and the preset rated value, so as to precisely suppress pressure fluctuations during valve switching.

[0011] Furthermore, the polymer dehydration assembly includes a mounting frame installed inside the pressure tank, a central shaft pivotally mounted on the mounting frame, and a passive impeller and a polymer adsorbent sequentially fixedly mounted on the central shaft; the passive impeller can drive the polymer adsorbent to rotate under the drive of natural gas flow, and is used to assist the polymer adsorbent in dehydration by utilizing centrifugal force.

[0012] Furthermore, the water collection and drainage module includes a water collection tank located at the bottom of the pressure tank, a liquid level sensor for detecting the water level in the water collection tank, and a drainage valve located in the water collection tank and controlled by the liquid level sensor.

[0013] Furthermore, the controller is also configured to control the backup valve to gradually open from the closed position to the fully open position, so as to pre-establish pressure in the backup pipeline before the main pipeline is closed.

[0014] Furthermore, the controller is also configured to control the time interval between the moment when the backup valve reaches the fully open state and the moment when the main valve completes the closing action to be within a preset time.

[0015] Furthermore, the monitoring and control module also includes a temperature sensor installed on the main pipeline; the controller is also configured to trigger an antifreeze alarm when the temperature sensor detects that the temperature of the main pipeline reaches a preset temperature threshold and the humidity sensor detects that the humidity of the dehydrated natural gas reaches a preset humidity threshold.

[0016] Furthermore, the controller is also configured to: when the antifreeze alarm is triggered, control the heat tracing device installed on the drain valve to turn on, so as to prevent the drain valve from freezing.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects: This invention uses a polymer dehydration component, combined with a pressure tank structure adapted to high-pressure conditions, which effectively improves the limited adsorption capacity of traditional dehydration components and can stably adapt to the complex high-pressure conditions of oil fields, thereby improving the natural gas dehydration effect and equipment adaptability from the core level.

[0018] This invention achieves precise control of pressure fluctuations by using a parallel main and backup pipeline structure and an intelligent valve switching program, in conjunction with an adjustable flow valve at the backup pipeline outlet. This solves the industry pain point that gas outages are inevitable during equipment maintenance. While ensuring continuous natural gas transmission, it avoids excessive pressure fluctuations during valve switching that could affect the operation of downstream equipment, thus significantly improving the continuity and economy of natural gas extraction and transmission.

[0019] This invention integrates multi-dimensional sensing and monitoring of pressure, humidity, temperature, and liquid level with intelligent control, enabling comprehensive monitoring of dehydration status, pipeline operation, and water level, as well as coordinated control of antifreeze alarm, automatic water discharge, and heat tracing start-up. It solves the problems of single monitoring parameters and delayed manual response in traditional equipment, significantly improving the intelligence level of equipment operation and the safety of low-temperature antifreeze in winter.

[0020] This invention, through a main / backup parallel structure, adaptable valves (main / backup high-pressure ball valves, adjustable throttle valves) and pressure compensation mechanism, applies the backup channel design to the high-pressure natural gas dehydration scenario for the first time, solving the technical problem that low-pressure backup designs across different fields cannot be directly reused. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 The diagram shows the overall structure of the integrated equipment for efficient dehydration of natural gas at the wellhead of the oilfield provided in this embodiment of the invention. In this diagram, P1 and P2 are the main and backup pipeline pressure sensors, respectively, L is the water level sensor in the water collection tank, H is the humidity sensor after dehydration, and T is the temperature sensor of the main pipeline. Figure 2 for Figure 1 The diagram shows the structural assembly between the polymer dehydration component and the pressure tank, and between the pressure tank and the water collection tank in the equipment shown. Figure 3 for Figure 2 A magnified view of the area shown at point A in the middle.

[0023] Figure label: 10-Pressure tank; 11-Water intake section; 20 - Polymer dehydration component; 30 - Water collection tank. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] I. Examples This embodiment provides an integrated equipment for efficient dehydration of natural gas at oilfield wellheads. Please refer to... Figure 1-2 As shown, the integrated high-efficiency dehydration equipment for natural gas at oilfield wellheads, as defined by this technical solution, consists of a conveying and valve system, a core processing module, a water collection and drainage module, and a monitoring and control module. The conveying and valve system is equipped with a main pipeline and a backup pipeline connected in parallel, and each is equipped with a main valve and a backup valve. The core processing module includes a pressure tank 10 in the main pipeline and a polymer dehydration component 20 inside the pressure tank 10. The water collection and drainage module is located at the lower part of the pressure tank 10 and is connected to the recessed water inlet 11 at the bottom of the pressure tank 10. The monitoring and control module includes a controller and a valve. The humidity sensor at the outlet of pressure tank 10 and the pressure sensors at the front end of the main / standby valves of the two pipelines are used. When the controller detects a sudden drop in pressure in the main pipeline or a continuous increase in natural gas humidity after dehydration, it first opens the standby valve and then closes the main valve when the pressure difference between the two pipelines is less than the preset value. This technical solution achieves uninterrupted maintenance and component replacement through the parallel design of the main and standby pipelines, solving the industry pain point that gas must be cut off during the maintenance of existing dehydration equipment. The dual monitoring of humidity and pressure can monitor the dehydration effect and pipeline operation status in real time. The integrated structure is adapted to the natural gas dehydration conditions at oilfield wellheads.

[0026] In this embodiment, the conveying and valve system is also equipped with an adjustable flow valve at the outlet end of the backup pipeline. After the backup valve is opened, the controller synchronously adjusts the opening of the throttle valve according to the deviation between the measured value of the pressure sensor on the backup pipeline and the preset rated value (such as 0.6MPa). This technical solution can precisely suppress pressure fluctuations during valve switching, avoid excessive pressure fluctuations that could cause downstream equipment to shut down, and improve the stability and safety of pipeline switching.

[0027] In this embodiment, the polymer dehydration component 20 includes a mounting frame installed inside the pressure tank 10, a central shaft pivotally mounted on the mounting frame, and a passive impeller and a polymer adsorbent sequentially fixed to the central shaft. The passive impeller, driven by natural gas flow, can rotate the polymer adsorbent, using centrifugal force to assist in dehydration. This scheme utilizes the flow energy of natural gas itself to drive the adsorbent component's rotation through a passive rotation structure, requiring no additional power. Rotation allows for a more uniform distribution of airflow on the adsorbent surface, while centrifugal force helps to remove adsorbed water from the surface, thus aiding regeneration or delaying saturation. The key is the combination of passive rotation, airflow homogenization, and centrifugal dehydration to form a self-driven, highly efficient dehydration method, particularly suitable for oilfield sites without external power.

[0028] In this embodiment, the water collection and drainage module includes a water collection tank 30 located at the bottom of the pressure tank 10, a level sensor for detecting the water level in the water collection tank 30, and a drain valve located in the water collection tank 30 and controlled by the level sensor. This technical solution collects the separated water through an independent water collection tank 30, monitors the water level in real time using the level sensor, and automatically controls the opening and closing of the drain valve, thus achieving automatic drainage. This avoids excessive water accumulation that could lead to freezing and cracking or affect the dehydration effect, and also avoids frequent manual drainage.

[0029] In this embodiment, the controller is further configured to control the backup valve to gradually open from the closed position to the fully open position, so as to pre-establish the pressure in the backup pipeline before the main pipeline is closed. This technical solution avoids pressure shock caused by sudden full opening of the valve by gradually opening the backup valve and allowing the backup pipeline pressure to rise slowly; pre-establishing the backup pipeline pressure before the main pipeline is closed enables seamless switching.

[0030] In this embodiment, the controller is further configured to ensure that the time interval between the moment when the backup valve reaches the fully open state and the moment when the main valve completes the closing action is controlled within a preset time. This technical solution, by precisely controlling the time interval between the backup valve fully opening and the main valve closing (e.g., within 1-2 seconds), avoids gas interruption caused by slow switching or pressure superposition caused by fast switching, thus ensuring continuous and stable airflow.

[0031] In this embodiment, the monitoring and control module further includes a temperature sensor installed on the main pipeline; the controller is also configured to trigger an anti-freezing alarm when the temperature sensor detects that the main pipeline temperature reaches a preset temperature threshold and the humidity sensor detects that the humidity of the dehydrated natural gas reaches a preset humidity threshold. This technical solution, by simultaneously monitoring the pipeline temperature and the humidity after dehydration, triggers an alarm when both low temperature and high humidity conditions are met, thus providing early warning of the risk of pipeline freezing and blockage and preventing equipment damage.

[0032] In this embodiment, the controller is also configured to activate the heat tracing device installed on the drain valve when the antifreeze alarm is triggered, in order to prevent the drain valve from freezing. This technical solution automatically activates the heat tracing device after the antifreeze alarm is triggered, actively heating the drain valve, which is most prone to freezing, thus preventing the valve from freezing and failing at the source, and further improving the operational reliability of the equipment in low-temperature winter environments.

[0033] II. Specific Implementation 1. Purpose of the invention Dehydration performance: The natural gas water dew point is stable at ≤-30℃ after dehydration, and the adsorption capacity decay rate under high pressure (0.6MPa) is ≤5% / year; Continuous operation: Gas supply interruption time during maintenance ≤ 5 minutes, pressure fluctuation during switching process ≤ 0.03MPa; Intelligent control: water level control accuracy ±0.5cm (no low temperature jamming), parameter monitoring response time ≤100ms; Extended lifespan: Overall system lifespan ≥ 5 years (more than twice as long as traditional carbon steel equipment).

[0034] 2. Overall Equipment Composition (1) Conveying and valve system: Designed with a "main and backup in parallel" structure, including a pressure compensation mechanism. Pipeline body: Both the main pipeline and the backup pipeline are made of L245 pipe steel and connected by flanges (to ensure high-pressure sealing). Valve assembly: Main / Standby valves: Both adopt high-pressure ball valves. One main valve is installed at the front end of the main pipeline, and one standby valve is installed at the front end of the standby pipeline to achieve rapid switching between "one main and one standby". Auxiliary valves: One filter valve is connected in series at the front end of both the main and backup pipelines (to intercept impurities with a particle size ≥5μm and protect the dehydration components), and one check valve is connected in series at the rear end of both pipelines (to prevent natural gas backflow). Stress compensation mechanism (core content): Control strategy: Employs "feedforward-feedback composite PID control". Feedforward control: When the pressure sensor detects a sudden drop in main pipeline pressure (e.g., main valve failure / main pipeline leakage, pressure drop ≥ 0.05 MPa), the controller immediately (0.5 seconds in advance) issues a pre-opening command to the standby valve (e.g., the pre-opening degree gradually increases from 0% to 30%, and then opens to 100%). This feedforward control, based on a direct response to the fault signal, is used to establish the initial pressure in the standby pipeline in advance, overcoming system inertial delay.

[0035] Feedback control: After the standby valve opens, the controller collects the measured value of the pressure sensor on the standby pipeline in real time, compares it with the preset rated pressure (e.g., 0.6 MPa), and calculates the deviation. The PID algorithm dynamically adjusts the opening of the throttle valve at the outlet of the standby pipeline based on this deviation, so that the pressure in the standby pipeline quickly approaches and stabilizes near the rated value.

[0036] Feedforward-feedback coordination: Feedforward control acts in advance, shortening response time and avoiding downstream fluctuations caused by sudden pressure drops; feedback control provides fine-tuning, eliminating steady-state deviations and ensuring pressure fluctuations during switching are ≤0.03MPa. The combination of these two approaches guarantees both rapid switching and pressure stability.

[0037] Timing switching logic: The time interval between the standby valve being fully open and the main valve being closed is controlled within 1-2 seconds to avoid gas interruption or airflow impact.

[0038] (2) Core processing module: Optimize polymer dehydration component 20 to adapt to high pressure scenarios Pressure tank 10: Made of stainless steel (resistant to hydrogen sulfide corrosion), designed pressure 1.6MPa (to meet high pressure requirements), with internal reserved modular component installation and matching structure; Polymer dehydration component 20: Equipment principle: No external power supply is required. It relies entirely on the kinetic energy of natural gas to impact the impeller, which drives the impeller, central shaft, and polymer adsorption components to rotate synchronously. High-speed centrifugal force is used to achieve gas-liquid separation and remove supersaturated water droplets. Most of the particulate matter is attached to the surface of the droplets, and deep dust removal is achieved simultaneously with dehydration.

[0039] Structural composition: The core components include: a mounting bracket installed inside the pressure tank, the mounting bracket having a flow hole for natural gas flow; a central shaft pivotally mounted on the mounting bracket; and a passive impeller and a polymer adsorbent sequentially fixedly mounted on the central shaft; wherein, the passive impeller can drive the polymer adsorbent to rotate under the drive of natural gas flow, for using centrifugal force to assist the polymer adsorbent in dehydration.

[0040] Material: High molecular adsorption materials, such as high molecular weight lipids, high molecular weight sieve composite fibers, etc.

[0041] Layout: Modular combination, with components connected by a quick-release structure, replacement time ≤30 minutes.

[0042] Features: No motor, no high pressure, no easily damaged parts, and no flushing water system.

[0043] (3) Water collection and drainage module: non-contact liquid level control to prevent low temperature jamming. Water collection tank 30: made of stainless steel, with a volume of 80L, installed at the bottom of pressure tank 10 (to receive water separated by the dehydration component). Liquid level monitoring: An ultrasonic level gauge is used for non-contact monitoring of water level, avoiding mechanical parts jamming at low temperatures (≤-30℃); Water drain control: An electric drain valve is installed at the bottom of the water collection tank 30. The control logic is "open the drain when the water level is ≥30cm and close it when the water level is ≤3cm" to prevent stagnant water from freezing and cracking or natural gas leakage.

[0044] (4) Monitoring and Control Module: Pressure sensor: Installed at the front end of the main / backup pipeline, measuring range 0-2.0MPa, accuracy ±0.02MPa, to monitor pipeline pressure fluctuations; Humidity sensor: installed at the outlet of pressure tank 10, measuring range 0-100% RH, accuracy ±2% RH, monitoring the humidity of natural gas after dehydration (target ≤5% RH); Temperature sensor: Installed on the outer wall of the pipe, measuring range from -30℃ to 50℃, accuracy ±0.5℃, monitoring the ambient temperature of the pipe (warning value ≤5℃); Liquid level sensor: namely ultrasonic liquid level gauge, which provides real-time feedback on the water level in the collection tank; Control box: Employs a PLC (Programmable Logic Controller) with integrated alarm function. For example, an audible and visual alarm is triggered when "pipeline temperature ≤ 5℃ and humidity > 5%RH" (risk of freezing and cracking), "water level > 30cm or < 3cm" (risk of freezing and cracking or leakage), or "pressure fluctuation > 0.05MPa" (pipeline or valve failure).

[0045] 3. Workflow Example (1) Normal operating mode Open the main valve and close the standby valve; natural gas enters the pressure tank 10 through the front-end filter valve of the main pipeline (to intercept impurities); Natural gas comes into contact with the polymer dehydration component 20, where moisture is adsorbed, and the dried natural gas (water dew point ≤ -30℃) is output to the downstream pipeline through the check valve; The separated water settles into the water collection tank 30 by gravity, the ultrasonic level gauge monitors the water level in real time, and the electric drain valve automatically maintains the water level at 3-30cm. (2) Real-time monitoring and triggering conditions The pressure sensor (located in the pipeline downstream of the main valve) detects a sudden drop in pressure in the main pipeline; The humidity sensor (outlet of pressure tank 10) detected a continuous increase in the humidity of the natural gas after dehydration; If any of the above conditions are met, the maintenance switching mode will be entered.

[0046] When the temperature sensor (main pipeline) detects that the pipeline temperature is ≤ preset threshold (e.g., 5℃, taking into account error and early warning) and the humidity is > preset threshold (e.g., 5%RH), it triggers an antifreeze warning and opens the drain valve and heat tracing device in advance.

[0047] In addition, the sensor network collects pressure (0.6MPa±0.02MPa), humidity (≤5% RH), and temperature (-30℃ to 50℃) data in real time, and the control box touch screen displays the real-time parameters. If there are no abnormalities, it continues to operate.

[0048] (3) Switch to maintenance mode When the dehydration components need to be replaced or the main pipeline / valve malfunctions, the "maintenance mode" is triggered via the control box; Open the standby valve (the pre-opening procedure gradually increases the opening to 100%), and close the main valve after the pressure in the standby pipeline stabilizes (the deviation from the main pipeline is ≤0.03MPa). After the backup valve is opened, the controller adjusts the opening of the throttle valve at the outlet of the backup pipeline according to the deviation between the measured value of the pressure sensor on the backup pipeline and the preset rated value (such as 0.6MPa) in order to precisely suppress pressure fluctuations during the switching process. The time interval between the standby valve being fully open and the main valve being closed is controlled within a preset time (e.g., 1-2 seconds) to achieve uninterrupted gas switching. During maintenance, disassemble the quick-release flange of the pressure tank 10 and replace the polymer dehydration component 20 (modular design, time ≤30 minutes); or replace the main valve / main pipeline. After maintenance is completed, reverse the switch (open the main valve → close the standby valve) to restore normal operation.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An integrated equipment for efficient dehydration of natural gas at oilfield wellheads, characterized in that, include: A conveying and valve system includes a main pipeline and a backup pipeline connected in parallel. The main pipeline is equipped with a main valve at its inlet end, and the backup pipeline is equipped with a backup valve at its inlet end. The outlet ends of both the main pipeline and the backup pipeline are connected to a downstream pipeline. The core processing module includes a pressure tank connected to the main pipeline and a polymer dehydration component installed in the pressure tank. The polymer dehydration component is used to centrifuge and dehydrate the water in the wellhead natural gas. A water collection and drainage module is located at the lower part of the pressure tank and is connected to the recessed water inlet at the bottom of the pressure tank. The monitoring and control module includes a controller, a humidity sensor installed on the outlet pipe of the pressure tank, and pressure sensors respectively installed at the front ends of the two pipes. The pressure sensors are located on the pipes downstream of the main valve and the backup valve. The controller is configured to execute a valve switching procedure when a pressure sensor detects a sudden drop in the pressure of the main pipeline or a continuous increase in the humidity of the natural gas after dehydration. The valve switching procedure includes: controlling the standby valve to open, and controlling the main valve to close when the pressure difference between the two pipelines is less than a preset pressure value, so as to enable maintenance or replacement without interrupting gas supply.

2. The integrated equipment for high-efficiency dehydration of natural gas at oilfield wellheads according to claim 1, characterized in that, The delivery and valve system also includes an adjustable throttle valve located at the outlet end of the backup pipeline; The controller is also configured to: after the backup valve is opened, synchronously adjust the opening of the throttle valve according to the deviation between the measured value of the pressure sensor on the backup pipeline and the preset rated value, so as to precisely suppress pressure fluctuations during valve switching.

3. The integrated equipment for high-efficiency dehydration of natural gas at oilfield wellheads according to claim 1, characterized in that, The polymer dehydration assembly includes a mounting frame installed inside the pressure tank, a central shaft pivotally mounted on the mounting frame, and a passive impeller and a polymer adsorbent sequentially fixed to the central shaft; the passive impeller can drive the polymer adsorbent to rotate under the drive of natural gas flow, and is used to assist the polymer adsorbent in dehydration by using centrifugal force.

4. The integrated equipment for high-efficiency dehydration of natural gas at oilfield wellheads according to claim 1, characterized in that, The water collection and drainage module includes a water collection tank located at the bottom of the pressure tank, a liquid level sensor for detecting the water level in the water collection tank, and a drain valve located in the water collection tank and controlled by the liquid level sensor.

5. The integrated equipment for high-efficiency dehydration of natural gas at oilfield wellheads according to claim 1, characterized in that, The controller is also configured to control the backup valve to gradually open from the closed position to the fully open position, so as to pre-establish pressure in the backup pipeline before the main pipeline is closed.

6. The integrated equipment for high-efficiency dehydration of natural gas at oilfield wellheads according to claim 5, characterized in that, The controller is also configured to control the time interval between the moment when the standby valve reaches the fully open state and the moment when the main valve completes the closing action to be within a preset time.

7. The integrated equipment for high-efficiency dehydration of natural gas at oilfield wellheads according to claim 1, characterized in that, The monitoring and control module also includes a temperature sensor installed on the main pipeline; the controller is further configured to trigger an antifreeze alarm when the temperature sensor detects that the temperature of the main pipeline reaches a preset temperature threshold and the humidity sensor detects that the humidity of the dehydrated natural gas reaches a preset humidity threshold.

8. The integrated equipment for high-efficiency dehydration of natural gas at oilfield wellheads according to claim 7, characterized in that, The controller is also configured to: when the antifreeze alarm is triggered, control the heat tracing device installed on the drain valve to turn on, so as to prevent the drain valve from freezing.

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