Gas well mouth infrared type pipeline heating device and method

Abstract

The invention discloses a gas well mouth infrared type pipeline heating device and method, and belongs to the technical field of natural gas exploitation, the gas well mouth infrared type pipeline heating device comprises a heating device body, a gas supply pipeline and a power distribution cabinet, the heating device body comprises a heating plate, and the heating plate is installed on the outer side of a pipeline; one end of the air supply pipeline is connected with the interior of the heating plate, the other end of the air supply pipeline is connected with an air source, the power distribution cabinet is connected with the heating device body and the electrical control system, a temperature controller and a time delay relay are arranged in the power distribution cabinet, the time delay relay is connected with the temperature controller, and the temperature controller is connected with the heating plate. According to the gas well mouth infrared type pipeline heating method, the gas well mouth infrared type pipeline heating device is utilized, the natural gas catalytic reaction infrared heating principle is utilized, the upstream airflow temperature is increased by remotely controlling and automatically supplementing heat loss on a pipe body and equipment, the upstream airflow temperature is made to be higher than the hydrate generation temperature under the given pressure, and pipeline blockage is prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of natural gas exploitation, and in particular relates to a gas wellhead infrared pipeline heating device and method. Background Art

[0002] During the drilling process of natural gas wells, there is a problem of natural gas hydrate formation. When certain temperature and pressure conditions are met, hydrates are easily formed. The formation of hydrates will reduce the flow area of ​​the gas pipeline, cause throttling, increase the pressure difference of the pipeline, and accelerate the further formation of hydrates. When hydrates continue to gather and grow, they will cause blockage of pipelines, valves and equipment, resulting in damage to pipe fittings, affecting the normal production of switch wells and natural gas. In particular, in the low temperature environment of winter for water-producing gas wells, gas trees and gas gathering pipelines are more susceptible to hydrate blockage, which can cause pipeline blockage, pipe burst and other accidents in severe cases.

[0003] The Sulige gas field adopts a medium-low pressure gas gathering mode, and a throttle is built into the gas wellbore. The throttle can throttle and reduce the pressure of natural gas, and use the ground temperature to heat it. The medium-low pressure gas gathering mode can reduce the pressure of the ground system, reduce the investment in ground construction, and prevent the formation of hydrates. However, in the ground part of the well site, especially in cold climate conditions, there is still a possibility of throttling and freezing during the well opening process.

[0004] A Chinese utility model patent with the authorization publication number CN203549923U published on April 16, 2014 discloses a gas catalytic flameless infrared radiation heater, which is a heating technology that uses natural gas as heating energy and is efficient, energy-saving, clean, safe, and environmentally friendly. However, it cannot achieve remote control automation, which limits its application.

[0005] There are at least the following problems in the process of natural gas well drilling:

[0006] First, during the current wellhead manual and electric valve opening process, hydrate ice blockage is prone to occur downstream in winter, causing well opening failure. Temperature compensation is required upstream of the valve to increase the medium temperature before the valve to destroy the hydrate formation conditions.

[0007] Second, many well sites are often without external electricity. If conventional methods such as heating cables are used for temperature compensation, the required power cannot be provided. If batteries and wind and solar power sources are used, the power cannot meet the heating requirements, and frequent replacement of batteries will cause environmental and economic problems.

[0008] Therefore, it is currently necessary to solve the problem of being unable to realize remote control automation to perform temperature compensation on the upstream of the valve when the gas well is opened. Summary of the invention

[0009] The purpose of the present invention is to overcome the problem that it is impossible to realize remote control automation to perform temperature compensation on the upstream of the valve when the gas well is opened. A gas well wellhead infrared pipeline heating device and method are proposed. The infrared heating principle of natural gas catalytic reaction is utilized to supplement the heat loss on the pipe body and equipment through remote control automation to increase the gas flow temperature before the valve to make it higher than the hydrate formation temperature under a given pressure, thereby preventing pipeline blockage.

[0010] In order to achieve the above object, the present invention adopts the following technical scheme:

[0011] A gas wellhead infrared pipeline heating device comprises a heating device body, a gas supply pipeline, and a power distribution cabinet. The heating device body comprises a heating plate, and the heating plate is installed on the outside of the pipeline. One end of the gas supply pipeline is connected to the inside of the heating plate, and the other end of the gas supply pipeline is connected to a gas source. The power distribution cabinet is connected to the heating device body, and the power distribution cabinet is connected to an electrical control system. A temperature controller and a time delay relay are arranged in the power distribution cabinet, and the time delay relay is connected to the temperature controller, and the temperature controller is connected to the heating plate.

[0012] Furthermore, the heating device body also includes an outer shell, which is installed on the outside of the heating plate. Grooves are opened at both ends of the outer shell close to one side of the pipeline. The grooves are semicircular and are clamped with the outer edge of the pipeline. Connecting plates are installed at both ends of the outer shell. Threaded holes are opened on the connecting plates. The two connecting plates at the same end of the outer shell are connected to each other by screws and nuts. Through holes are opened on both sides of the outer shell, and the through holes are connected to the power distribution cabinet.

[0013] Furthermore, a gas source pipeline valve group is installed on the gas supply pipeline, and the gas source pipeline valve group includes a solenoid valve, a pressure reducing valve and a manual ball valve. The solenoid valve is installed at one end of the gas supply pipeline close to the gas inlet pipe, the manual ball valve is installed at one end of the gas supply pipeline close to the gas source, the pressure reducing valve is installed between the solenoid valve and the manual ball valve, and a pressure gauge is installed between the pressure reducing valve and the solenoid valve.

[0014] Furthermore, the electrical control system includes a preheating start part and an automatic temperature control part, and both the preheating start part and the automatic temperature control part are configured with a temperature control table and a time delay relay.

[0015] Furthermore, the heating plate includes a catalytic blanket; the catalytic blanket is covered with catalytic blanket protective fibers, and a stainless steel protective wire mesh is installed on the catalytic blanket protective fibers; a fiber insulation layer is arranged at the bottom of the heating plate, a thermocouple, a power connector and a gas inlet pipe are arranged at the lower end of the fiber insulation layer, the thermocouple is connected to the catalytic blanket, and the gas inlet pipe is connected to the gas source pipeline valve group; a gas flow distribution pipe is installed at the upper end of the fiber insulation layer, the gas flow distribution pipe is connected to the gas inlet pipe, an insulation board is arranged between the gas flow distribution pipe and the fiber insulation layer, a gas flow distribution plate is installed at the upper end of the gas flow distribution pipe, a gas dispersion layer is installed at the upper end of the gas flow distribution plate, an electric preheating heater is installed between the gas dispersion layer and the catalytic blanket, and the electric preheating heater is connected to the power connector.

[0016] Furthermore, the heating plate further comprises a heating plate shell, and a plurality of ventilation holes are provided at both ends of the heating plate shell.

[0017] A gas wellhead infrared pipeline heating method, using the gas wellhead infrared pipeline heating device, comprises the following steps: installing the gas wellhead infrared pipeline heating device in front of the wellhead electric or manual needle valve, the electrical control system controls the preheating of the heating plate, when the preheating temperature of the heating plate reaches the set temperature, the preheating power supply is disconnected, the electrical control system starts timing, the gas supply pipeline supplies gas to the inside of the heating plate, and the heating plate is heated;

[0018] After the heating plate has been heated for a preset time, the electrical control system begins to detect the temperature of the heating plate in real time. If the temperature of the heating plate is greater than the preheating temperature of the heating plate, the heating plate is started successfully, and the infrared pipeline heating device at the wellhead of the gas well begins to heat the infrared pipeline at the wellhead of the gas well. If the temperature of the heating plate is lower than the set temperature lower limit, the heating plate fails to start, and the electrical control system controls the gas supply pipeline to cut off gas.

[0019] Furthermore, the preheating temperature uses a temperature controller to set a first alarm temperature value. When the preheating temperature reaches the first alarm temperature value, the temperature controller outputs a signal to cut off the preheating power supply of the heating plate and starts the delay relay at the same time.

[0020] Furthermore, after the heating plate is successfully started, the temperature controller sets the temperature value and the second alarm temperature value. If the temperature of the heating plate exceeds the range of the temperature value ± the second alarm temperature value, the electrical control system controls the gas supply pipeline to cut off gas.

[0021] Furthermore, the gas wellhead infrared pipeline heating device adopts heating plates of different sizes and shapes for gas wells with different production rates, including a single-plate type, a double-plate reinforced type, and a series-connected reinforced type of several groups of gas wellhead infrared pipeline heating devices.

[0022] Compared with the prior art, the present invention has the following beneficial technical effects:

[0023] The infrared pipeline heating device for gas wellhead provided by the present invention does not rely on a large number of external power supplies, has low power consumption, and is suitable for long-term application under severe weather conditions on site. On the one hand, it can meet the production needs of intelligent gas fields and realize automatic management by linking with remote control well switch equipment. On the other hand, it can solve the problem of well opening failure and inability to implement emergency shut-off caused by hydrate ice blockage downstream of the well site valve, providing strong assistance for the safe production of gas fields, and has broad application prospects in the field of gas field exploitation.

[0024] The infrared pipeline heating device for a gas wellhead provided by the present invention does not require mains electricity supply, adopts infrared radiation heating, and avoids energy loss caused by visible light emitted by gas phase reaction. No strong heat exchange occurs on the surface of the heated object, smoke and surface damage generated during contact heating can be avoided, heat loss is small, environmental protection and energy saving are achieved, and the device has the performance of working in all weather conditions, which can greatly reduce the maintenance cost of gas well pipelines in winter.

[0025] The present invention provides a gas wellhead infrared pipeline heating method, which can mix natural gas with air in proportion, perform a flameless reaction on the catalyst surface, convert energy into infrared rays, and heat the fluid medium molecules in the pipeline by infrared irradiation, thereby destroying the conditions for hydrate formation. This can solve the problem of well opening failure caused by hydrate ice blockage in the downstream during the current wellhead valve opening process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings in the specification are used to provide further understanding of the present invention and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0027] Figure 1 The present invention is a schematic diagram of the internal structure of a heating plate of an infrared pipeline heating device at a gas wellhead.

[0028] Figure 2a The present invention is a schematic diagram of the inner appearance of a heating plate of an infrared pipeline heating device at a gas wellhead.

[0029] Figure 2b The present invention is a schematic diagram of the outer appearance of a heating plate of an infrared pipeline heating device at a gas wellhead.

[0030] Figure 3 The present invention is a schematic diagram of a preheating heater of a gas wellhead infrared pipeline heating device.

[0031] Figure 4 The present invention is a schematic diagram of the casing and installation of an infrared pipeline heating device at the wellhead of a gas well.

[0032] Figure 5This is a schematic diagram of the appearance of a gas wellhead infrared pipeline heating device body and a power distribution cabinet of the present invention.

[0033] Figure 6 The present invention is a schematic diagram of a gas source pipeline valve group of a gas wellhead infrared pipeline heating device.

[0034] Figure 7 The present invention is a schematic diagram of a double-plate reinforced design and installation method of a gas wellhead infrared pipeline heating device.

[0035] Figure 8 It is a schematic diagram of a series-enhanced design and installation method of a gas wellhead infrared pipeline heating device according to the present invention.

[0036] Fig. 9 The present invention discloses a circuit diagram of an electrical control system for an infrared pipeline heating device at a gas wellhead.

[0037] Among them, 1. Stainless steel protective wire mesh; 2. Catalytic blanket protective fiber; 3. Catalytic blanket; 4. Electric preheating heater; 5. Gas dispersion layer; 6. Gas flow equalizing plate; 7. Gas flow equalizing distribution pipe; 8. Insulation board; 9. Fiber insulation layer; 10. Thermocouple; 11. Power connector; 12. Gas inlet pipe; 13. Heating plate housing; 14. Solenoid valve; 15. Pressure gauge; 16. Pressure reducing valve; 17. Manual ball valve; 18. Distribution cabinet; 19. Pipeline; 20. Housing. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0039] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0040] Embodiment 1

[0041] See also Figure 4 , Figure 5 , Figure 6 A gas wellhead infrared pipeline heating device is characterized in that it includes a heating device body, a gas supply pipeline, and a distribution cabinet 18. The heating device body includes a heating plate, which is installed on the outside of the pipeline 19. One end of the gas supply pipeline is connected to the inside of the heating plate, and the other end of the gas supply pipeline is connected to the gas source. The distribution cabinet 18 is connected to the heating device body, and the distribution cabinet 18 is connected to the electrical control system. A temperature controller and a delay relay are arranged in the distribution cabinet 18. The delay relay is connected to the temperature controller, and the temperature controller is connected to the heating plate.

[0042] See also Figure 4 The heating device body also includes a shell 20, which is installed on the outside of the heating plate. Grooves are provided at both ends of the shell 20 near one side of the pipeline 19. The grooves are semicircular and are snap-fitted with the outer edge of the pipeline 19. Connecting plates are installed at both ends of the shell 20. Threaded holes are provided on the connecting plates. The two connecting plates at the same end of the shell 20 are connected to each other through screws and nuts. Through holes are provided on both sides of the shell, and the through holes are connected to the distribution cabinet 18.

[0043] See also Figure 6 A gas source pipeline valve group is installed on the gas supply pipeline, and the gas source pipeline valve group includes a solenoid valve 14, a pressure reducing valve 16 and a manual ball valve 17. The solenoid valve 14 is installed at one end of the gas supply pipeline close to the gas inlet pipe 12, and the manual ball valve 17 is installed at one end of the gas supply pipeline close to the gas source. The pressure reducing valve 16 is installed between the solenoid valve 14 and the manual ball valve 17, and a pressure gauge 15 is installed between the pressure reducing valve 16 and the solenoid valve 14.

[0044] See also Fig. 9 The electrical control system includes a preheating start part and an automatic temperature control part. Both the preheating start part and the automatic temperature control part are equipped with a temperature control table and a delay relay.

[0045] See also Figure 1 and Figure 3The heating plate includes a catalytic blanket 3; the catalytic blanket 3 is covered with a catalytic blanket protection fiber 2, and a stainless steel protective wire mesh 1 is installed on the catalytic blanket protection fiber 2. A fiber insulation layer 9 is arranged at the bottom of the heating plate, and a thermocouple 10, a power connector 11 and a gas inlet pipe 12 are arranged at the lower end of the fiber insulation layer 9, the thermocouple 10 is connected to the catalytic blanket 3, and the gas inlet pipe 12 is connected to the gas source pipeline valve group; a gas flow distribution pipe 7 is installed at the upper end of the fiber insulation layer 9, the gas flow distribution pipe 7 is connected to the gas inlet pipe 12, an insulation board 8 is arranged between the gas flow distribution pipe 7 and the fiber insulation layer 9, a gas flow plate 6 is installed at the upper end of the gas flow distribution pipe 7, a gas dispersion layer 5 is installed at the upper end of the gas flow plate 6, an electric preheating heater 4 is installed between the gas dispersion layer 5 and the catalytic blanket 3, and the electric preheating heater 4 is connected to the power connector 11.

[0046] See also Figure 2a , Figure 2b The heating plate further comprises a heating plate shell 13, and a plurality of vent holes are formed at both ends of the heating plate shell 13.

[0047] A gas wellhead infrared pipeline heating method, using the gas wellhead infrared pipeline heating device according to any one of claims 1 to 6, characterized in that it comprises the following steps: installing the gas wellhead infrared pipeline heating device in front of the wellhead electric or manual needle valve, the electrical control system controlling the preheating of the heating plate, when the preheating temperature of the heating plate reaches the set temperature, the preheating power supply is disconnected, the electrical control system starts timing, the gas supply pipeline supplies gas to the inside of the heating plate, and the heating plate is heated;

[0048] After the heating plate has been heated for a preset time, the electrical control system begins to detect the temperature of the heating plate in real time. If the temperature of the heating plate is greater than the preheating temperature of the heating plate, the heating plate is started successfully, and the infrared pipeline heating device at the wellhead of the gas well begins to heat the infrared pipeline at the wellhead of the gas well. If the temperature of the heating plate is lower than the set temperature lower limit, the heating plate fails to start, and the electrical control system controls the gas supply pipeline to cut off gas.

[0049] The preheating temperature uses a temperature controller to set the first alarm temperature value. When the preheating temperature reaches the first alarm temperature value, the temperature controller outputs a signal to cut off the preheating power supply of the heating plate and starts the delay relay at the same time.

[0050] After the heating plate is successfully started, the temperature controller sets the temperature value and the second alarm temperature value. If the temperature of the heating plate exceeds the range of the temperature value ± the second alarm temperature value, the electrical control system controls the gas supply pipeline to cut off gas.

[0051] See also Figure 7 and Figure 8 The infrared pipeline heating device at the wellhead of the gas well adopts heating plates of different sizes and shapes for gas wells with different production rates, including a single-plate type, a double-plate reinforced type, and a series-connected reinforced type of several groups of infrared pipeline heating devices at the wellhead of the gas well.

[0052] Embodiment 2

[0053] See also Figure 5 , Figure 6 , a gas wellhead infrared pipeline heating device, including a heating device body, a gas source pipeline valve group, a power distribution cabinet and an electrical control system. Using the principle of infrared heating of natural gas catalytic reaction, the temperature of the gas flow before the valve is increased by supplementing the heat loss on the pipe body and equipment, making it higher than the hydrate formation temperature under a given pressure, preventing pipeline blockage. The heating device body is installed in front of the wellhead electric or manual needle valve.

[0054] See also Figure 2a , Figure 2b The heating device body includes a housing 20 and a heating plate. The gas source pipeline valve group includes a solenoid valve 14, a pressure gauge 15, a pressure reducing valve 16, and a manual ball valve 17.

[0055] See also Figure 1 , Figure 3 The heating plate includes a stainless steel protective wire mesh 1, a catalytic blanket protective fiber 2, a catalytic blanket 3, a preheating heater, a gas dispersion layer 5, a gas flow equalizing plate 6, a gas flow equalizing distribution pipe 7, an insulation plate 8, a fiber insulation layer 9, a thermocouple 10, a power connector 11, a gas inlet pipe 12, and a heating plate housing 13. The preheating heater adopts an electric preheating heater 4.

[0056] See also Figure 1 , Figure 3 , Figure 4 , the heating plate shell 13 fixes the heating device body on the pipeline, bolts and buckles. The upper and lower sides of the heating plate shell 13 are provided with vents, so that there is enough air inside the heating device body to ensure the reaction of the gas and oxygen in the heating device body. The gas source enters the heating device body through the gas inlet pipe 12. The power connector 11 can be connected to an external DC power supply to realize the protection control during the preheating start and normal operation of the heating device body. The thermocouple 10 can measure the surface temperature of the stainless steel protection net 1 inside the heating device body, and transmit the signal to the electrical control system to realize high and low temperature protection control and preheating start control. The heat insulation board 8 and the fiber heat insulation layer 9 can keep warm and prevent heat energy from being lost. The gas enters and distributes evenly in the gas dispersion layer 5, the gas flow plate 6, and the gas flow distribution pipe 7 to ensure that the gas can be evenly distributed during the catalytic reaction inside the gas, and realize effective and uniform reaction; the electric preheating heater 4 can be connected to a 24V power supply to preheat the catalytic blanket 3 to the starting temperature when the device is started. The catalytic blanket 3 can react with the gas catalytically to produce a flame without open flame, releasing infrared radiation heating. The catalytic blanket protection fiber 2 covers the catalytic blanket 3 for protection, and can effectively take in air at high temperatures. The stainless steel protection net 1 can protect the catalytic blanket 3, the heat insulation layer 9 and other components inside the device from damage.

[0057] The size of the heating plate housing 13 is: 380mm×380mm×300mm, the size of the heating plate is: 303mm×303mm×104mm, the preheating power is: 600W, the maximum heating power of the heating device body is: 1.7KW, the natural gas volume is 0.17m 3 / h, the power supply is 24V DC, 1.5A, and the shell material of the heating plate shell 13 is 304 stainless steel.

[0058] The gas source pipeline valve group structure is mainly composed of a manual ball valve 17, a solenoid valve 14, a pressure reducing valve 16 and a pressure gauge 15, which provide the heating plate with natural gas (1-5KPa) that meets the required pressure. The manual ball valve 17 is the main switch valve, which must be fully opened when starting the heating plate. The manual ball valve 17 is also the valve for emergency closing of the gas supply pipeline. The pressure reducing valve 16 can reduce the high-pressure natural gas in the gas supply pipeline to below 5KPa to meet the gas demand consumed by the heating plate. The gas demand consumed by the heating plate is very small, and the required gas must be reduced to less than or equal to 5KPa. The pressure gauge 15 can detect and display the gas supply pressure to meet the natural gas supply pressure of 1-5KPa when starting the heating plate. The solenoid valve 14 is a high and low temperature protection valve for the heating plate, which is used to automatically control the on and off of the gas supply. When the preheating of the heating plate is completed, the electrical control system outputs a signal to open the solenoid valve 14, and keeps it open during operation. When the temperature inside the heating plate exceeds or falls below the set normal temperature range for any reason at any time, the solenoid valve 14 will close to play an automatic protection role.

[0059] The electrical control system is mainly divided into two parts: preheating / starting and automatic temperature control. It consists of two sets of temperature control meters / thermocouple temperature probes, timers, relays, etc. to realize the start / shutdown of the heating plate and high and low temperature switch control.

[0060] A gas wellhead infrared pipeline heating method, when the control system is preheating, the internal preheating couple of the preheating heater 4 is used to indicate the preheating temperature. When the preheating temperature reaches the set temperature, it indicates that the catalytic blanket 3 can work, at this time the solenoid valve 14 is opened, the natural gas enters and starts to react with oxygen, and the surface temperature of the heating plate rises. The preheating power supply will be cut off, and the delay relay KT starts timing.

[0061] When natural gas is input into the heating plate, the temperature on the surface of the heating plate begins to rise. After a period of time (tens of seconds), the surface temperature of the heating plate will be higher than the preheating temperature. At this time, the temperature displayed on the temperature controller will switch to the surface thermocouple of the heating plate to detect the temperature inside the heating plate in real time.

[0062] Since the surface temperature of the heating plate is much lower than the back temperature of the catalytic blanket 3 during preheating when it is not started, if the working thermocouple of the heating plate is switched immediately after ventilation, the detected temperature may be lower than the lower limit of the temperature setting, and the system may immediately cut off the air intake to play a role in low temperature protection. The delay relay allows ventilation for a period of time (usually tens of seconds) before testing the surface temperature of the heater to ensure that the surface temperature is higher than the preheating temperature. The surface thermocouple of the heating plate will display the temperature of the heating plate after startup. If the temperature is still lower than the set lower limit of the temperature at this time, it indicates that the heating plate has not started successfully, and the electrical control system will automatically cut off the air intake.

[0063] In order to reduce power consumption, the same temperature controller TFUN1 is used for preheating and working. The preheating temperature is set by an alarm temperature value (ALD1) of the temperature controller. When the temperature reaches this threshold, the temperature controller outputs a signal to cut off the preheating power supply and start the delay relay at the same time. In the working state, the temperature controller will be within the range of the set temperature value (SV) and +- the second alarm temperature value (ALD2). If it exceeds the range, the electrical control system will automatically cut off the air intake to play a protective role.

[0064] Preferably, heating plates of different sizes and shapes can be designed for gas wells with different production, using single-plate type, double-plate reinforced type and multiple sets of devices in series reinforced type design methods respectively. Single-plate heating can be used for gas wells with daily production of less than 3,000 cubic meters, and double-plate reinforced type can be used for gas wells with daily production of 3,000 to 5,000 cubic meters. When the well site temperature is lower than -20°C in winter, series installation before the valve and reinforced installation after the valve can be used to increase the gas flow temperature or destroy the hydrate formation conditions in the valve area.

[0065] Field tests were carried out in more than 30 gas wells. The test results showed that the heating device operated stably and continuously for more than 360 hours, the operating temperature of the heating device was not less than 200°C, and the maximum temperature did not exceed 680°C. It can effectively heat the pipelines near the gas well switching device, and prevent and improve the freezing and blockage problems that occur during the switching process.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that after reading the present invention, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the invention, but these changes, modifications or equivalent substitutions are all within the protection scope of the pending claims of the invention.

Claims

1. A gas wellhead infrared pipeline heating device, characterized in that: The invention comprises a heating device body, an air supply pipeline, and a power distribution cabinet (18). The heating device body comprises a heating plate, and the heating plate is installed on the outside of a pipeline (19). One end of the air supply pipeline is connected to the inside of the heating plate, and the other end of the air supply pipeline is connected to an air source. The power distribution cabinet (18) is connected to the heating device body, and the power distribution cabinet (18) is connected to an electrical control system. A temperature controller and a time delay relay are arranged in the power distribution cabinet (18), and the time delay relay is connected to the temperature controller, and the temperature controller is connected to the heating plate.

2. The gas wellhead infrared pipeline heating device according to claim 1, characterized in that: The heating device body also includes a shell (20), the shell (20) is installed on the outside of the heating plate, and grooves are provided at both ends of the shell (20) near the side of the pipeline (19), the grooves are semicircular, and the grooves are clamped with the outer edge of the pipeline (19), and connecting plates are installed at both ends of the shell (20), and threaded holes are provided on the connecting plates. The two connecting plates at the same end of the shell (20) are connected to each other through screws and nuts, and through holes are provided on both sides of the shell, and the through holes are connected to the power distribution cabinet (18).

3. The gas wellhead infrared pipeline heating device according to claim 1, characterized in that: A gas source pipeline valve group is installed on the gas supply pipeline, and the gas source pipeline valve group includes a solenoid valve (14), a pressure reducing valve (16) and a manual ball valve (17). The solenoid valve (14) is installed at one end of the gas supply pipeline close to the gas inlet pipe (12), and the manual ball valve (17) is installed at one end of the gas supply pipeline close to the gas source. The pressure reducing valve (16) is installed between the solenoid valve (14) and the manual ball valve (17), and a pressure gauge (15) is installed between the pressure reducing valve (16) and the solenoid valve (14).

4. The gas wellhead infrared pipeline heating device according to claim 1, characterized in that: The electrical control system comprises a preheating start part and an automatic temperature control part, and both the preheating start part and the automatic temperature control part are equipped with a temperature control table and a time delay relay.

5. The gas wellhead infrared pipeline heating device according to claim 1, characterized in that: The heating plate comprises a catalytic blanket (3); the catalytic blanket (3) is covered with a catalytic blanket protection fiber (2), the catalytic blanket protection fiber (2) is installed with a stainless steel protection wire mesh (1), a fiber heat insulation layer (9) is arranged at the bottom of the heating plate, a thermocouple (10), a power supply connector (11) and a gas intake pipe (12) are arranged at the lower end of the fiber heat insulation layer (9), the thermocouple (10) is connected to the catalytic blanket (3), and the gas intake pipe (12) is connected to the gas source pipeline valve group; the upper end of the fiber heat insulation layer (9) is provided with a thermocouple (10), a power supply connector (11) and a gas intake pipe (12), the thermocouple (10) is connected to the catalytic blanket (3), and the gas intake pipe (12) is connected to the gas source pipeline valve group; the upper end of the fiber heat insulation layer (9) is provided with a thermocouple (10), a power supply connector (11) and a gas intake pipe (12) A gas flow distribution pipe (7) is installed at the end, the gas flow distribution pipe (7) is connected to the gas inlet pipe (12), a heat insulation board (8) is arranged between the gas flow distribution pipe (7) and the fiber heat insulation layer (9), a gas flow plate (6) is installed at the upper end of the gas flow distribution pipe (7), a gas dispersion layer (5) is installed at the upper end of the gas flow plate (6), an electric preheating heater (4) is installed between the gas dispersion layer (5) and the catalytic blanket (3), and the electric preheating heater (4) is connected to a power supply connector (11).

6. The gas wellhead infrared pipeline heating device according to claim 5, characterized in that: The heating plate further comprises a heating plate outer shell (13), and a plurality of vent holes are provided at two ends of the heating plate outer shell (13).

7. A gas wellhead infrared pipeline heating method, using the gas wellhead infrared pipeline heating device as claimed in any one of claims 1 to 6, characterized in that: The following steps are involved: The infrared pipeline heating device at the wellhead of the gas well is installed in front of the electric or manual needle valve at the wellhead. The electrical control system controls the preheating of the heating plate. When the preheating temperature of the heating plate reaches the set temperature, the preheating power supply is disconnected, the electrical control system starts timing, and the gas supply pipeline supplies gas to the inside of the heating plate, and the heating plate heats up. After the heating plate has been heated for a preset time, the electrical control system begins to detect the temperature of the heating plate in real time. If the temperature of the heating plate is greater than the preheating temperature of the heating plate, the heating plate is started successfully, and the infrared pipeline heating device at the wellhead of the gas well begins to heat the infrared pipeline at the wellhead of the gas well. If the temperature of the heating plate is lower than the set temperature lower limit, the heating plate fails to start, and the electrical control system controls the gas supply pipeline to cut off gas.

8. The gas wellhead infrared pipeline heating method according to claim 7, characterized in that: The preheating temperature uses a temperature controller to set a first alarm temperature value. When the preheating temperature reaches the first alarm temperature value, the temperature controller outputs a signal to cut off the preheating power supply of the heating plate and simultaneously starts the delay relay.

9. The gas wellhead infrared pipeline heating method according to claim 7, characterized in that: After the heating plate is successfully started, the temperature controller sets the temperature value and the second alarm temperature value. If the temperature of the heating plate exceeds the range of the temperature value ± the second alarm temperature value, the electrical control system controls the gas supply pipeline to cut off gas.

10. The gas wellhead infrared pipeline heating method according to claim 7, characterized in that: The gas wellhead infrared pipeline heating device adopts heating plates of different sizes and shapes for gas wells with different production rates, including a single-plate type, a double-plate reinforced type and a series-connected reinforced type of several groups of gas wellhead infrared pipeline heating devices.

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