Pipe rod hot air cleaning and descaling system and method

Abstract

The invention provides a pipe rod hot air cleaning and descaling system and method.The cleaning and descaling system comprises a control cabinet, an anti-explosion distribution box, a draught fan, an anti-explosion electric heater and a corrugated pipe, the draught fan, the anti-explosion electric heater and the corrugated pipe are sequentially communicated, and the anti-explosion electric heater and the draught fan are both electrically connected with the anti-explosion distribution box; the fan, the anti-explosion electric heater and the anti-explosion distribution box are all electrically connected with the control cabinet, and the control cabinet is used for receiving signals of the anti-explosion electric heater and controlling power distribution of the anti-explosion distribution box according to the signals. The fan and the anti-explosion electric heater are matched to push pressurized air to heat, pressurized hot air is jetted through the pipeline, oil stains and wax precipitation substances are melted and discharged through the high temperature of the hot air, and the cleaning effect is more thorough. The temperature and pressure in the cleaning and descaling process are monitored in real time through the control cabinet to achieve automatic control, and meanwhile operation safety is guaranteed through the safety valve and the pressure release valve.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil pipe degreasing and descaling, and specifically relates to a pipe rod hot air cleaning and descaling system and method. Background Art

[0002] During the long-term and long-distance operation of oilfield pipelines, different degrees of dirt appear inside the pipelines. The generation of dirt has a serious impact on oil transportation operations and wastes a large amount of energy. After the oil well operation is completed, the inside of the oil pipe is often covered with oil, wax, water scale, and iron oxides. For a small oilfield with an annual output of 2 million tons, about 170,000 oil pipes need to be repaired every year, and each oil pipe costs about 500 yuan. If not repaired, it will greatly increase the cost of oilfield development. The most important link in the oil pipe repair process is the cleaning of the oil pipe. Therefore, the cleaning effect of the oil pipe directly affects the success or failure of the oil pipe repair process and the economic benefits of the oilfield.

[0003] Currently, the methods for cleaning oil pipes at home and abroad are mainly divided into two categories: heating cleaning, and the cleaning methods include steam car cleaning, hot boiling pool cleaning, medium and high-frequency heating cleaning, etc. This method has disadvantages such as incomplete cleaning and a large impact on the environment; chemical cleaning, mainly using chemical catalysts, diesel, etc. to dissolve dirt so as to achieve the purpose of cleaning. However, due to the different liquids transported by the pipeline, the chemical composition of the scale is also different, resulting in incomplete descaling, poor cleaning effect, and it may also pollute the liquid, pollute the environment, and corrode the oil pipe material, etc. Therefore, it is used less.

[0004] The descaling device disclosed in the invention patent with the patent number 202311163514.4 and the patent name "A descaling device for petroleum machinery pipelines and its use method" includes a cleaning device, a control box, a dust-proof net, and a high-temperature heating box. The descaling device includes an ultrasonic generator, an ultrasonic converter, and an ultrasonic vibration rod. The drying device includes an electric heating wire and a fan. An air inlet is opened on the baffle, and a dust-proof net is provided on the air inlet. The descaling device is arranged on the baffle, the drying device is connected to the control box, the drying device is arranged in the cavity, and the cavity is communicated with the air inlet. This invention transports the cleaning liquid into the pipeline through a high-temperature liquid delivery pipe, and then removes the scale on the inner wall of the pipeline through ultrasonic waves. After descaling is completed, the cleaning liquid is discharged, the drying device is turned on, the electric heating wire heats up, and the fan blows the heated hot air into the pipeline to quickly dry the pipeline. However, the above patent can only descale, has a poor oil removal effect, and a chemical cleaning agent is required in the cleaning liquid, resulting in incomplete cleaning. Summary of the Invention

[0005] The purpose of the present invention is to provide a pipe rod hot air cleaning and descaling system to overcome the above technical problems existing in the prior art.

[0006] Another object of the present invention is to provide a method for cleaning and descaling pipe rods with hot air. Pressurized gas is pushed by an air pump for heating, and the pressurized hot air is sprayed through a pipeline to achieve the purpose of heating and cleaning.

[0007] To this end, the technical solution provided by the present invention is as follows: A pipe rod hot air cleaning and descaling system includes a control cabinet, an explosion-proof distribution box, a fan, an explosion-proof electric heater, and a corrugated pipe. The fan, the explosion-proof electric heater, and the corrugated pipe are connected in sequence. The explosion-proof electric heater and the fan are electrically connected to the explosion-proof distribution box. The fan, the explosion-proof electric heater, and the explosion-proof distribution box are all electrically connected to the control cabinet. The control cabinet is used to receive the signal of the explosion-proof electric heater and control the power distribution of the explosion-proof distribution box according to this signal.

[0008] The explosion-proof electric heater includes a dry-burning cylinder and a dry-burning rod. The dry-burning rod is arranged inside the dry-burning cylinder. A safety valve, a pressure gauge, and a thermometer are installed on the dry-burning cylinder. The pressure gauge and the thermometer respectively send the detected pressure and temperature data to the control cabinet.

[0009] The outlet of the corrugated pipe is connected with a through tubing joint, and the through tubing joint is connected to the pipe rod to be cleaned and descaled. An oil recovery pool is provided at the outlet end of the pipe rod to be cleaned and descaled.

[0010] The outlet of the fan is connected to a high-pressure rubber hose, and the other end of the high-pressure rubber hose is connected to a three-way joint. The two outlets of the three-way joint are respectively connected to a pressure relief valve and an explosion-proof electric heater.

[0011] The opening pressure of the safety valve is less than the opening pressure of the pressure relief valve.

[0012] A method for cleaning and descaling pipe rods with hot air uses a pipe rod hot air cleaning and descaling system. The fan sends cold air into the explosion-proof electric heater. The dry-burning rod in the explosion-proof electric heater heats the dry-burning cylinder. The air is heated after passing through the dry-burning cylinder and is discharged from the outlet of the explosion-proof electric heater. Then, the hot air is sent into the pipe rod to be cleaned and descaled through the corrugated pipe at the outlet of the explosion-proof electric heater via the through tubing joint. The wax and oil deposits in the oil pipe are melted by the continuous hot air, and the melted oil is discharged to the oil recovery pool from the tail of the oil pipe together with the hot air.

[0013] During the cleaning and descaling process, the temperature data detected by the thermometer in real time is sent to the control cabinet. When the temperature exceeds the set value, the control cabinet sends a signal to the explosion-proof distribution box to stop supplying power to the explosion-proof electric heater through the explosion-proof distribution box.

[0014] During the cleaning and descaling process, the pressure data detected by the pressure gauge in real time is sent to the control cabinet. When the pipe rod hot air cleaning and descaling system is blocked, resulting in the internal pressure of the system rising to the opening pressure of the safety valve, the safety valve opens for exhaust; If the pressure continues to rise, the control cabinet sends a signal to the explosion-proof distribution box to stop power supply to the explosion-proof electric heater through the explosion-proof distribution box, and at the same time, the pressure relief valve opens.

[0015] The beneficial effects of the present invention are: The pipe and rod hot air cleaning and descaling system provided by the present invention, through the cooperation of a fan and an explosion-proof electric heater, melts and discharges oil stains and wax deposits by using the high temperature of hot air, with a more thorough cleaning effect, avoiding the problem of incomplete cleaning in traditional cleaning methods.

[0016] The present invention realizes automatic control by the control cabinet real-time monitoring the temperature and pressure during the cleaning and descaling process, and at the same time ensures the operation safety through the safety valve and the pressure relief valve.

[0017] The method of the present invention pushes pressurized gas through an air pump for heating, and sprays the pressurized hot gas through a pipeline to achieve the purpose of heating and cleaning; without using chemical cleaning agents, it avoids environmental pollution caused by chemical cleaning, reduces pollution to rivers and soil; uses hot air to heat the oil pipe, which is much more energy-saving compared with traditional heating and cleaning methods, reduces energy waste and environmental emissions; will not cause corrosive damage to the oil pipe, with thorough cleaning, increases the service life of the oil pipe, and reduces the frequency and cost of maintenance. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0019] In the figure: 1, fan; 2, high-pressure rubber hose; 3, explosion-proof distribution box; 4, pressure relief valve; 5, dry-burning rod; 6, dry-burning cylinder; 7, safety valve; 8, pressure gauge; 9, thermometer; 10, bellows; 11, pipe and rod to be cleaned and descaled; 12, oil stain recovery tank. Embodiment

[0020] The following specific embodiments illustrate the embodiments of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0021] Now refer to the drawings to introduce the exemplary embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely, and fully convey the scope of the present invention to those skilled in the art. The terms in the exemplary embodiments shown in the drawings are not limitations on the present invention.

[0022] Unless otherwise specified, the terms used herein (including technical terms) have the ordinary meaning understood by those skilled in the relevant technical field. Additionally, it can be understood that terms defined in commonly used dictionaries should be construed as having a meaning consistent with the context of their relevant fields, and should not be construed as idealized or overly formal meanings. Embodiment

[0023] The present invention provides a pipe and rod hot air cleaning and descaling system, as Figure 1 shown, which includes a control cabinet, an explosion-proof distribution box 3, a fan 1, an explosion-proof electric heater, and a corrugated pipe 10. The fan 1, the explosion-proof electric heater, and the corrugated pipe 10 are connected in sequence. The explosion-proof electric heater and the fan 1 are both electrically connected to the explosion-proof distribution box 3. The fan 1, the explosion-proof electric heater, and the explosion-proof distribution box 3 are all electrically connected to the control cabinet. The control cabinet is used to receive the signal of the explosion-proof electric heater and control the power distribution of the explosion-proof distribution box 3 according to this signal.

[0024] Working principle: Taking air as the medium and using the fan 1 as the power source, cold air is sent into the explosion-proof electric heater. The explosion-proof electric heater heats the air, and the hot air is discharged from the outlet of the explosion-proof electric heater. The hot air is sent into the pipe and rod through the corrugated pipe 10 at the outlet of the explosion-proof electric heater. The wax and oil stains in the oil pipe are melted by the continuous high-temperature air, and then the melted oil stains are discharged from the tail of the oil pipe together with the hot air.

[0025] By cooperating the fan 1 and the explosion-proof electric heater, the present invention melts and discharges the oil stains and wax substances by using the high temperature of the hot air, and the cleaning effect is more thorough, avoiding the problem of incomplete cleaning in the traditional cleaning method. Embodiment

[0026] Based on Embodiment 1, the present embodiment provides a pipe and rod hot air cleaning and descaling system. The explosion-proof electric heater includes a dry-burning cylinder 6 and a dry-burning rod 5. The dry-burning rod 5 is arranged inside the dry-burning cylinder 6. A safety valve 7, a pressure gauge 8, and a thermometer 9 are installed on the dry-burning cylinder 6. The pressure gauge 8 and the thermometer 9 respectively send the detected pressure and temperature data to the control cabinet.

[0027] The dry-burning rod 5 inside the explosion-proof electric heater heats the dry-burning cylinder 6, and the air is heated after passing through the dry-burning cylinder 6 and is discharged from the outlet of the explosion-proof electric heater. The present invention realizes safe automatic control by the control cabinet monitoring the temperature and pressure in the cleaning and descaling process in real time, and at the same time ensures the operation safety through the safety valve 7 and the pressure relief valve 4. Embodiment

[0028] Based on Embodiment 1, this embodiment provides a pipe and rod hot air cleaning and descaling system. The outlet of the corrugated pipe 10 is connected with a through tubing joint, and the through tubing joint is connected to the pipe and rod 11 to be cleaned and descaled. An oil recovery pool 12 is provided at the outlet end of the pipe and rod 11 to be cleaned and descaled.

[0029] As Figure 1 shown, hot air sequentially passes through the explosion-proof electric heater outlet, the corrugated pipe 10, and the through tubing joint and enters the oil pipe. The continuous high-temperature air melts the wax and oil stains in the oil pipe, and then discharges the melted oil stains together with the hot air from the tail of the oil pipe to the oil recovery pool 12.

[0030] Among them, the corrugated pipe 10 is a stainless steel corrugated pipe. The fan 1 is a Roots blower (the Roots blower is equipped with a high-efficiency explosion-proof three-phase asynchronous motor). The temperature of the air transported by the Roots blower shall not be greater than 90 °C, and the temperature of the air heated by the explosion-proof electric heater shall not be greater than 350 °C (the temperature range of the thermometer 9 is 0 - 400 °C), and the working temperature is 300 - 350 °C. The particulate matter content in the air shall not exceed 100 mg / m 3 , and the maximum size of the particles shall not exceed half of the minimum working clearance. During operation, the bearing temperature shall not be higher than 95 °C, and the lubricating oil temperature shall not be higher than 65 °C. When the Roots blower is running, the oil levels in the main oil tank and the auxiliary oil tank must be between the two meridians of the oil level gauge. Embodiment

[0031] Based on Embodiment 2, this embodiment provides a pipe and rod hot air cleaning and descaling system. The outlet of the fan 1 is connected to a high-pressure rubber hose 2, and the other end of the high-pressure rubber hose 2 is connected to a three-way joint. The two outlets of the three-way joint are respectively connected to a pressure relief valve 4 and an explosion-proof electric heater.

[0032] The opening pressure of the safety valve 7 is less than the opening pressure of the pressure relief valve 4.

[0033] The high-pressure rubber hose 2 can introduce the air transported by the fan 1 into the explosion-proof electric heater. The other end of the high-pressure rubber hose 2 is connected to a three-way joint (the three-way joint is to connect the high-pressure pipeline, the pressure relief valve 4, and the explosion-proof electric heater into a passage). The two outlets of the three-way joint are respectively connected to the pressure relief valve 4 (the pressure relief valve 4 is used to relieve the pressure inside the device when the safety valve 7 comes into effect) and the inlet of the explosion-proof electric heater. Embodiment

[0034] This embodiment provides a method for removing scale from tubing and rod by hot air cleaning, which uses a tubing and rod hot air cleaning and scale removal system. The fan 1 sends cold air into the explosion-proof electric heater. The dry-burning rod 5 in the explosion-proof electric heater heats the dry-burning cylinder 6. The air is heated after passing through the dry-burning cylinder 6 and is discharged from the outlet of the explosion-proof electric heater. Then, the hot air is sent into the tubing and rod 11 to be cleaned and descaled through the bellows at the outlet of the explosion-proof electric heater. The wax and oil fouling in the tubing are melted by the continuous hot air, and the melted oil is discharged from the tail of the tubing to the oil pollution recovery tank 12 together with the hot air.

[0035] The method of the present invention uses an air pump to push pressurized gas for heating, and sprays the pressurized hot gas through a pipeline to achieve the purpose of heating and cleaning; no chemical cleaning agent is used, avoiding environmental pollution caused by chemical cleaning and reducing pollution to rivers and soil; the tubing is heated by hot air, which is much more energy-saving compared with traditional heating and cleaning methods, reducing energy waste and environmental emissions; it will not cause corrosive damage to the tubing, the cleaning is thorough, increasing the service life of the tubing and reducing the frequency and cost of maintenance. Embodiment

[0036] Based on Embodiment 5, this embodiment provides a method for removing scale from tubing and rod by hot air cleaning. During the cleaning and scale removal process, the temperature data detected by the thermometer 9 in real time is sent to the control cabinet. When the temperature exceeds the set value, the control cabinet sends a signal to the explosion-proof distribution box 3, and the power supply to the explosion-proof electric heater is stopped through the explosion-proof distribution box 3.

[0037] During the cleaning and scale removal process, the pressure data detected by the pressure gauge 8 in real time is sent to the control cabinet. When the tubing and rod hot air cleaning and scale removal system is blocked, resulting in the internal pressure of the system rising to the opening pressure of the safety valve 7, the safety valve 7 opens for exhaust; If the pressure continues to rise, the control cabinet sends a signal to the explosion-proof distribution box 3, and the power supply to the explosion-proof electric heater is stopped through the explosion-proof distribution box 3, and at the same time, the pressure relief valve 4 opens.

[0038] For cleaning the 73mm tubing, first conduct a routine inspection of the air cleaning and scale removal system. After checking that there are no safety hazards, start the operation. Connect the air cleaning and scale removal system to the 73mm tubing. After the connection is completed, turn it on and observe the system status and instruments. After all the oil pollution behind the tubing has flowed out, replace it with the next tubing for continuous cleaning.

[0039] During use, if a blockage or other situation causes the internal pressure of the equipment to rise to 0.7 MPa, the safety valve 7 will open for exhaust. If the pressure continues to rise, turn off the equipment and manually relieve the pressure and exhaust at the pressure relief valve 4.

[0040] The above examples are merely illustrative of the present invention and do not constitute a limitation on the scope of protection of the present invention. Any design identical or similar to the present invention falls within the scope of protection of the present invention.

Claims

1. A pipe rod hot air cleaning and descaling system, characterized in that: It includes a control cabinet, an explosion-proof distribution box, a fan, an explosion-proof electric heater and a corrugated pipe. The fan, the explosion-proof electric heater and the corrugated pipe are connected in sequence. The explosion-proof electric heater and the fan are both electrically connected to the explosion-proof distribution box. The fan, the explosion-proof electric heater and the explosion-proof distribution box are all electrically connected to the control cabinet. The control cabinet is used to receive the signal of the explosion-proof electric heater and control the power distribution of the explosion-proof distribution box according to this signal.

2. The pipe rod hot air cleaning and descaling system according to claim 1, characterized in that: The explosion-proof electric heater includes a dry burning cylinder and a dry burning rod. The dry burning rod is arranged in the dry burning cylinder. A safety valve, a pressure gauge and a thermometer are installed on the dry burning cylinder. The pressure gauge and the thermometer respectively send the detected pressure and temperature data to the control cabinet.

3. The pipe rod hot air cleaning and descaling system according to claim 1, characterized in that: The outlet of the corrugated pipe is connected with a through-pass oil pipe joint. The through-pass oil pipe joint is connected to the pipe rod to be cleaned and descaled. An oil pollution recovery pool is arranged at the outlet end of the pipe rod to be cleaned and descaled.

4. The pipe rod hot air cleaning and descaling system according to claim 2, characterized in that: The outlet of the fan is connected with a high-pressure rubber hose. The other end of the high-pressure rubber hose is connected with a three-way joint. The two outlets of the three-way joint are respectively connected to a pressure relief valve and an explosion-proof electric heater.

5. The pipe rod hot air cleaning and descaling system according to claim 2, characterized in that: The opening pressure of the safety valve is less than the opening pressure of the pressure relief valve.

6. A pipe rod hot air cleaning and descaling method, using the pipe rod hot air cleaning and descaling system according to claim 5, characterized in that: The fan sends cold air into the explosion-proof electric heater. The dry burning rod in the explosion-proof electric heater heats the dry burning cylinder. The air is heated after passing through the dry burning cylinder and is discharged from the outlet of the explosion-proof electric heater. Then, the hot air is sent into the pipe rod to be cleaned and descaled through the corrugated pipe at the outlet of the explosion-proof electric heater via the through-pass oil pipe joint. The wax and oil stains in the oil pipe are melted by the continuous hot air, and then the melted oil stains are discharged to the oil pollution recovery pool from the tail of the oil pipe together with the hot air.

7. The pipe rod hot air cleaning and descaling method according to claim 6, characterized in that: During the cleaning and descaling process, the temperature data detected by the thermometer in real time is sent to the control cabinet. When the temperature exceeds the set value, the control cabinet sends a signal to the explosion-proof distribution box to stop supplying power to the explosion-proof electric heater through the explosion-proof distribution box.

8. The pipe rod hot air cleaning and descaling method according to claim 6, characterized in that: During the cleaning and descaling process, the pressure data detected by the pressure gauge in real time is sent to the control cabinet. When the pipe rod hot air cleaning and descaling system is blocked, resulting in the internal pressure of the system rising to the opening pressure of the safety valve, the safety valve opens for exhaust; If the pressure continues to rise, the control cabinet sends a signal to the explosion-proof distribution box to stop supplying power to the explosion-proof electric heater through the explosion-proof distribution box, and at the same time the pressure relief valve opens.

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