Water-saving and energy-saving heating furnace for producing well

Abstract

The heating furnace is provided with an electric control cabinet, a water storage bag and a furnace body, an automatic control module is installed in the electric control cabinet, a safety valve and the water storage bag are arranged on the top of the furnace body, and the water storage bag is communicated with the furnace body through a condensation pipe and an overflow pipe. An air suction pump connected with the water storage bag through an air suction pipe is connected with an automatic control module in the electric control cabinet through a cable; and an electric contact negative pressure gauge connected with an automatic control module in the electric control cabinet through a cable is arranged at the upper end of the furnace body and is communicated with the furnace body. Stable negative pressure is formed in the furnace body through the air extracting pump and the electric control cabinet, the positive pressure phenomenon does not occur even when water vapor is too much, and the action of the safety valve can be effectively avoided. The utility model has the advantages of simpler structure and lower manufacturing cost. Safety production and normal operation of crude oil conveying can be guaranteed, meanwhile, water and water resources are saved, production cost is reduced, the operation time rate of an oil well and a heating furnace is increased, and a good using effect is achieved.

Description

Technical Field

[0001] The utility model relates to an oil well heating furnace for heating crude oil in an oil well of the petroleum industry, in particular to a water-saving and energy-saving oil well heating furnace. Background Art

[0002] At present, water-jacketed heating furnaces are widely used in the oil development industry. The water-jacketed heating furnaces currently in use have low thermal efficiency due to scaling and other reasons, resulting in waste of fuel and energy; water vapor evaporation leads to waste of water resources, resulting in frequent water replenishment, waste of water resources, and a large workload. Most water-jacketed heating furnaces are distributed in the field and need to be transported by vehicles for water replenishment, resulting in an increase in vehicle labor costs.

[0003] At present, vacuum phase change heating furnaces are gradually being used in the oil development industry. They use the negative pressure formed by the condensation of water vapor. The negative pressure is unstable, which affects the formation of water vapor and the heat exchange efficiency. When more water vapor is generated, positive pressure often occurs, causing the safety valve to operate and even bursting accidents. When positive pressure occurs, the function of the negative pressure phase change is lost, and the medium transported in the coil cannot be heated by a large amount of steam, which is prone to freezing in winter. The patented technology has a complex structure, a high production cost, and a high failure rate, which affects the timeliness of normal production.

[0004] The current heating furnace has been improved. After searching, there are the following heating furnaces: "An oil well heating furnace" disclosed by the authorization announcement number CN206091932U. The above utility model is mainly used in the oil development industry to transport and heat the crude oil produced by the oil well. An oil well heating furnace includes a furnace body, a water storage bag is installed on the top of the furnace body, a water inlet is provided on the top of the water storage bag, and a water storage bag pressure relief cover is installed, and its inner cavity is connected to the water storage layer in the furnace body through a connecting pipe. The water added to the furnace body from the water storage bag has a higher temperature, and does not require a large amount of energy to reach the temperature in the water storage layer in the furnace body, saving energy. Since the medium in the furnace body is always in a full state, it will not cause the water jacket furnace coil to coke, and will not cause the water jacket furnace to be scrapped, ensuring the normal production of the oil well. In order to facilitate the observation of the water level in the water storage bag, the device is also equipped with a liquid level meter, which makes observation and operation more convenient and feasible, and has good use effect and economic benefits.

[0005] However, the above device still has the following defects: the patented technology is equipped with a water storage bag, a pressure relief cover and an overflow pipe, which can dissipate some water vapor, resulting in a waste of water resources and energy. The steam collector of the patented technology is two umbrella-shaped covers facing each other, which has a poor effect in collecting steam and dissipates some water vapor, resulting in a waste of water resources and energy. The water inlet of the patented technology adds water to 1 / 4 of the water storage bag, and the utilization rate of the water storage bag is low. The water contained is small, which easily leads to the water temperature in the water storage bag being too high or even boiling, causing a large amount of water vapor to be lost, resulting in a waste of water resources and energy. The patented technology uses heated hot water to heat the coil of the conveying medium, and the thermal efficiency is lower than that of steam phase-change heating. The patented technology is equipped with an external condenser, which is prone to freezing and blockage accidents when the temperature is low in winter.

[0006] The authorization announcement number CN209116843U discloses a "removable and maintainable phase change heating furnace for oil fields". The heating furnace includes a heating furnace body; insulation material is arranged on the outside of the heating furnace body, a burner and a chimney are arranged on one side of the heating furnace body, a corrugated furnace core and a threaded smoke pipe are arranged at the lower end of the interior of the heating furnace body, a backfire chamber is arranged between the corrugated furnace core and the threaded smoke pipe, and the flue gas burned by the burner passes through the corrugated furnace core, the backfire chamber, the threaded smoke pipe, and the smoke box and is discharged through the chimney; the lower end of the interior of the heating furnace body is filled with water, the corrugated furnace core, the threaded smoke pipe, and the backfire chamber are all placed in water, and a heat exchange coil is arranged at the upper end of the interior of the heating furnace body, and the heat exchange coil can be removed from and installed on the inside of the heating furnace body.

[0007] However, the above device still has the following defects: the patented technology uses water vapor to form negative pressure after condensation, but the negative pressure is unstable, which affects the formation of water vapor and the heat exchange efficiency. When more water vapor is generated, positive pressure often occurs, which can cause the safety valve to operate and even cause explosion accidents. When positive pressure occurs, the function of negative pressure phase change is lost, and the medium transported in the coil cannot be heated by a large amount of steam, which is prone to freezing in winter. The patented technology has a complex structure, high production cost, and high failure rate, which affects the normal production timeliness.

[0008] Authorization announcement number CN103542523A "A vacuum phase change heating furnace for oil fields", the heating furnace includes a crude oil heat exchanger, a heating heat exchanger and a waste heat heater, the vacuum phase change heating furnace is provided with a shell, the shell is provided with valve instruments, insulation layer, burner and smoke outlet, the shell is provided with a furnace, smoke box and threaded smoke pipe. The above invention is characterized in that a crude oil heat exchanger and a heating heat exchanger are provided in the vacuum phase change heating furnace, the water outlet of the heating heat exchanger is connected to the water inlet of the waste heat heater, and the waste heat heater is arranged behind the smoke outlet of the vacuum phase change heating furnace as a secondary heater for heating water for the rear heating surface.

[0009] However, the above device still has the following defects: the patented technology uses the condensation of water vapor to form negative pressure, and the negative pressure is unstable, which affects the formation of water vapor and the heat exchange efficiency; when more water vapor is generated, positive pressure often occurs, causing the safety valve to operate and even bursting accidents. When positive pressure occurs, the function of negative pressure phase change is lost, and the medium transported in the coil cannot be heated by a large amount of steam, which is prone to freezing in winter. The patented technology has a complex structure, high production cost, and a high failure rate, which affects the timeliness of normal production.

[0010] At present, the heating furnaces used in oil field production wells still need to be improved. Summary of the invention

[0011] The purpose of the utility model is to provide a water-saving and energy-saving oil well heating furnace, which simplifies the structure, improves the structure of the water storage bag, saves water for heating the heating furnace, prevents the heating furnace from having positive pressure, ensures safe production and normal crude oil transportation, saves water resources, saves water, and reduces production costs.

[0012] The technical solution of the utility model is as follows: a water-saving and energy-saving oil well heating furnace is provided with an electric control cabinet, a water storage bag and a furnace body, an automatic control module is installed in the electric control cabinet, a safety valve and a water storage bag are arranged on the top of the furnace body, wherein: the water storage bag is connected with the furnace body through a condenser and an overflow pipe; the vacuum pump connected with the water storage bag through a vacuum pipe is connected with the automatic control module in the electric control cabinet through a cable; the electric contact negative pressure gauge connected with the automatic control module in the electric control cabinet through a cable is installed at the upper end of the furnace body and is connected with the furnace body.

[0013] Preferably, the lower end of the overflow pipe in the water storage bag is immersed in the heating water in the furnace body.

[0014] Preferably, the immersion depth of the lower end of the overflow pipe immersed in the heating water is set between 8 cm and 15 cm.

[0015] Preferably, the condenser in the water storage bag is a U-shaped tube and bends above the liquid level of condensed water in the water storage bag, the inlet of the condenser is connected to the furnace body, and the outlet of the condenser bends downward and is immersed in the condensed water in the water storage bag.

[0016] Preferably, a control valve is installed in the air extraction pipe between the air extraction pump and the water storage bag.

[0017] Preferably, the water used for heating is tap water or purified water.

[0018] Preferably, the safety valve installed on the top of the furnace body is a diaphragm safety valve.

[0019] Preferably, a movable water storage bag insulation cover is also installed on the outer wall of the water storage bag, and the water storage bag insulation cover is provided with an insulation cover sheet, a connecting hook and a rotating shaft. The insulation cover sheet is provided with two pieces, one end of which is connected by a rotating shaft and the other end is fixed by a connecting hook.

[0020] Preferably, the thermal insulation package sheet is composed of an outer layer and a filling layer, the outer layer is a 0.5mm-1mm stainless steel plate, and the filling layer is rock wool.

[0021] Preferably, the coil in the furnace body is fixed above the heating water.

[0022] Compared with the prior art, the utility model has the following beneficial effects: the utility model is mainly used in the oil development industry, using a heating furnace to heat and transport the crude oil produced by the oil well, and can also be used in the heating, chemical and other industries, using a heating furnace to heat and transport the liquid medium. The main effect of the utility model is that the utility model heats the coil of the medium transported in the furnace body through steam, and the condensed water generated can be reused, which not only has a high thermal efficiency, but also effectively saves heating water.

[0023] The utility model has no external condensing pipe, and the accident of freezing and blocking will not occur.

[0024] The utility model utilizes an air pump and an automatic control module in an electric control cabinet to form a stable negative pressure in the furnace body, which is convenient for the formation of water vapor and has high heat exchange efficiency. When there is a lot of water vapor, positive pressure does not occur, which can effectively avoid the action of the safety valve and avoid large safety accidents such as explosion of the heating furnace.

[0025] The utility model has a simple structure, low production cost and low failure rate. It can ensure safe production and normal crude oil transportation, save water and water resources, reduce production costs, improve the operating efficiency of oil wells and heating furnaces, and has a good use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 It is a structural schematic diagram of the utility model.

[0028] Figure 2 yes Figure 1 Schematic diagram of the structure of the insulation cover of the middle water storage bag.

[0029] In the figure: electric control cabinet 1, vacuum pump 2, vacuum pipe 3, water inlet 4, condenser 5, water storage bag 6, chimney 7, furnace body 8, coil 9, burner head 10, electric contact negative pressure gauge 11, safety valve 12, drain port 13, liquid inlet 14, heating water 15, fire tube 16, base 17, overflow pipe 18; water storage bag insulation cover 19, insulation cover sheet 19-1, connecting hook 19-2, rotating shaft 19-3. DETAILED DESCRIPTION

[0030] The accompanying drawings are for reference and illustration only and are not intended to limit the scope of protection of the present utility model. The technical solutions in the embodiments of the present utility model will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.

[0031] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0032] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0033] See also Figure 1-Figure 2 A water-saving and energy-saving oil well heating furnace is provided with an electric control cabinet 1, a water storage bag 6 and a furnace body 8. The electric control cabinet 1 is equipped with an automatic control module. A safety valve 12 and a water storage bag 6 are provided on the top of the furnace body 8, wherein: the water storage bag 6 is connected to the furnace body 8 through a condenser 5 and an overflow pipe 18; the air pump 2 connected to the water storage bag 6 through an air extraction pipe 3 is connected to the automatic control module in the electric control cabinet 1 through a cable; an electric contact negative pressure gauge 11 connected to the automatic control module in the electric control cabinet 1 through a cable is installed at the upper end of the furnace body 8 and is connected to the furnace body 8.

[0034] The utility model is mainly used in the oil development industry, using the heating furnace to heat and transport the crude oil produced by the oil well. It can also be used in the heating, chemical and other industries, using the heating furnace to heat and transport the liquid medium.

[0035] The furnace body 8 of the utility model is equipped with a coil 9, the liquid inlet 14 of the coil 9 is connected to the wellhead production valve, the liquid outlet 13 of the coil 9 is connected to the crude oil delivery pipeline, and the furnace body 8 is supported and fixed on the ground by a base 17.

[0036] The fire tube 16 is installed in the furnace body 8, one end of which is connected to the burner head 10 outside the furnace body 8, and the other end is connected to the chimney 7 outside the furnace body 8, to heat the heating water 15 in the furnace body 8. The fire tube 16 is immersed in the heating water 15 in the furnace body 8, and the burner head 10 is used to heat the fire tube 16 and the heating water 15. The heated heating water 15 generates heat and steam, and the oil well production fluid in the coil 9 is heated and the viscosity is reduced, which facilitates the transportation of crude oil.

[0037] The condensing pipe 5 and the overflow pipe 18 in the water storage bag 6 of the utility model use the water seal principle to prevent the water vapor in the furnace body 8 from being lost, and use the pressure conduction principle to keep the furnace body 8 and the water storage bag 6 in a relatively balanced pressure. The water storage bag 6 is connected to the furnace body 8 through the condensing pipe 5 and the overflow pipe 18. The excess steam enters the water storage bag 6 through the condensing pipe 5 and condenses to produce condensed water, which is stored in the water storage bag 6. When the amount of stored water exceeds the upper end of the overflow pipe 18, it can flow into the furnace body 8 and be used as heating water 15 to heat the coil 9, saving the amount of water used for heating crude oil, saving water resources, and also saving the vehicle cost and labor cost of transporting the heating water 15.

[0038] In addition, since the water storage bag 6 is arranged at the top of the furnace body 8, the condensed water is formed by condensation of the hot steam in the condenser pipe 5, and the condenser pipe 5 and the overflow pipe 18 connected to the furnace body 8 and the furnace body 8 all have a heating effect on the condensed water in the water storage bag 6, which can further save energy. When the heating water 15 in the furnace body 8 is reduced, water can be added through the water inlet 4 at the upper end of the water storage bag 6.

[0039] The vacuum pump 2 provided in the utility model is connected to the automatic control module in the control cabinet 1 through a cable, which can form a stable negative pressure in the furnace body 8. The vacuum pump 2 is used to extract the gas in the water storage bag 6, which facilitates the formation of water vapor in the water storage bag 6 and improves the heat exchange efficiency.

[0040] At the same time, the utility model installs an electric contact negative pressure gauge 11 on the upper end of the furnace body 8 and is connected to the furnace body 8. The electric contact negative pressure gauge 11 is connected to the automatic control module in the electric control cabinet 1 through a cable, and can automatically measure the pressure value and change in the furnace body 8 to avoid positive pressure in the furnace body 8. If the pressure is abnormal, an alarm can be automatically given. When an abnormal situation occurs or the automatic control module in the electric control cabinet 1 fails, once the pressure in the furnace body 8 exceeds the specified upper limit, the safety valve 12 will open to release the pressure to avoid accidents caused by excessive pressure.

[0041] Based on the above embodiment 1, the utility model also has the following embodiments:

[0042] A preferred embodiment: the lower end of the overflow pipe 18 in the water storage bag 6 is immersed in the heating water 15 in the furnace body 8. The lower end of the overflow pipe 18 in the water storage bag 6 is immersed in the heating water 15, which can prevent the overflow pipe 18 from freezing in winter; the lower end of the overflow pipe 18 is immersed below the liquid level of the heating water 15 in the furnace body 8, and the water vapor can be prevented from being lost through the overflow pipe 18.

[0043] A preferred embodiment: the immersion depth of the lower end of the overflow pipe 18 in the heating water 15 is set to be between 8cm and 15cm. On the one hand, it can prevent the steam in the furnace body 8 from entering the water storage bag 6 along the overflow pipe 18 and then entering the atmosphere from the vacuum pump 2; on the other hand, it can further improve the use effect of condensed water and reduce the use amount of heating water 15.

[0044] A preferred embodiment: the condenser tube 5 in the water storage bag 6 is a U-shaped tube and is bent above the condensed water level in the water storage bag 6. The inlet of the condenser tube 5 is connected to the furnace body 8, and the outlet of the condenser tube 5 is bent downward and immersed in the condensed water in the water storage bag 6. When the steam entering the water storage bag 6 is condensed, the dissipated heat can heat the condensed water in the water storage bag 6, avoiding heat waste, and preventing the condenser tube 5 from freezing while saving energy. The U-shaped condenser tube 5 is installed upside down, and the bent part of the condenser tube 5 is placed above the condensed water level in the upper part of the water storage bag 6, which can increase the effective capacity of the water storage bag 6 and avoid the boiling of the water in the water storage bag 6 and the loss of water vapor. With this arrangement, very little water vapor is lost, which can save water resources and energy.

[0045] A preferred embodiment: a control valve is installed in the air extraction pipe 3 between the air extraction pump 2 and the water storage bag 6. The installation of the control valve can control the amount of steam in the water storage bag 6 to make the steam amount moderate. The air extraction pump 2 is a mature negative pressure extraction device, which is installed next to the heating furnace. The inlet of the air extraction pump 2 is connected to the outlet of the air extraction pipe 3, and the outlet of the air extraction pump 2 is connected to the atmosphere. The circuit of the air extraction pump 2 is connected to the automatic control module in the electric control cabinet 1 through a cable.

[0046] A preferred embodiment: the heating water 15 is tap water or purified water, and purified water is better to avoid scaling on the inner wall of the furnace body 8 and the outer wall of the fire tube 16.

[0047] A preferred embodiment: the safety valve 12 installed on the top of the furnace body 8 is a diaphragm safety valve. It works reliably. The safety valve 12 is installed on the top of the furnace body 8 and is connected to the furnace body 8. When the pressure in the furnace body 8 exceeds a preset value, the diaphragm in the safety valve 12 is pushed open to release excess gas and pressure.

[0048] A preferred embodiment: a movable water storage bag insulation cover 19 is also installed on the outer wall of the water storage bag 6, and the water storage bag insulation cover 19 is provided with an insulation cover sheet 19-1, a connecting hook 19-2 and a rotating shaft 19-3. The insulation cover sheet 19-1 is provided with two sheets and one end is connected by the rotating shaft 19-3, and the other end is fixed by the connecting hook 19-2. The opening and closing degree of the water storage bag insulation cover 19 can be adjusted, thereby adjusting the insulation effect. The utility model adds a water storage bag insulation cover 19 on the outside of the water storage bag 6 to avoid the loss of water vapor caused by the boiling of water in the water storage bag 6. When the temperature is high, it is difficult to adjust the water temperature in the water storage bag 6 to below 100 degrees by appropriately reducing the fire, and the water storage bag insulation cover 19 can be opened to dissipate heat. By coordinating with the water storage bag insulation cover 19, the water temperature in the water storage bag 6 can be adjusted to below 100 degrees, and the purpose of saving gas can be achieved. Especially in winter, the closed water storage bag insulation cover 19 can effectively save energy and effectively maintain and improve the water temperature in the water storage bag 6.

[0049] A preferred embodiment: the heat-insulating jacket sheet 19-1 is composed of an outer layer and a filling layer, the outer layer is a 0.5mm-1mm stainless steel sheet, and the filling layer is rock wool. It is low-cost and has significant effects.

[0050] A preferred embodiment: the coil 9 in the furnace body 8 is fixed above the heating water 15, so that the conveying liquid in the coil 9 can fully utilize the high temperature in the furnace body 8 for heating.

[0051] In short, the improved utility model can overcome the defects of the prior art: the water temperature added to the furnace body 8 from the water storage bag 6 is relatively high, and the temperature of the heating water 15 in the furnace body 8 can be reached without a large amount of energy, thus saving energy.

[0052] Since the heating water 15 and the condensed water in the furnace body 8 and the water storage bag 6 are always in a slightly negative pressure state, the safety valve 12 of the heating furnace will not open under positive pressure, and its operation and operation are safe and reliable.

[0053] Since the heating water 15 in the furnace body 8 is always in a slightly negative pressure state, it can boil at a temperature below 100 degrees, generating a large amount of water vapor. When the water vapor rises, it condenses and releases a large amount of heat after encountering the coil 9, thereby heating the medium in the coil 9.

[0054] The excess water vapor in the furnace body 8 enters the condenser 5. When passing through the condenser 5, part of the water vapor condenses and the remaining water vapor is discharged into the water storage bag 6 through the outlet of the condenser 5 and turns the water vapor into liquid, which is mixed with the condensed water in the water storage bag 6. After the liquid level of the condensed water in the water storage bag 6 rises and is higher than the upper end of the overflow pipe 18, the excess condensed water in the water storage bag 6 overflows and enters the heating water 15 inside the furnace body 8, replenishing the heating water 15 inside the furnace body 8.

[0055] The main component of the gas on the top of the water storage bag 6 is air, and there is also a small amount of water vapor. The inlet of the vacuum pump 2 is connected to the top of the water storage bag 6 through the vacuum pipe 3, and the outlet of the vacuum pump 2 is connected to the atmosphere. The gas on the top of the water storage bag 6 is extracted by the vacuum pump 2. According to the automatic control module in the electric control cabinet 1 and the pressure inside the heating furnace, the operation of the vacuum pump 2 can be automatically controlled to keep the water storage bag 6 and the furnace body 8 of the heating furnace in a slightly negative pressure state.

[0056] The electric contact negative pressure gauge 11 is installed on the top of the furnace body 8 and is connected to the inside of the heating furnace. It can detect the pressure inside the furnace body 8 of the heating furnace and transmit the detection signal to the electric control cabinet 1; the automatic control module in the electric control cabinet 1 reasonably adjusts the start, stop and operation status of the vacuum pump 2 according to the collected pressure signal, so that the water storage bag 6 and the furnace body 8 of the heating furnace continue to maintain a slight negative pressure state.

[0057] The utility model has a simple structure and overcomes the defects of the prior art through the above improvements. It can save heating water 15 in the heating furnace, prevent the heating furnace from having positive pressure, ensure safe production and normal crude oil transportation, save water resources and reduce production costs.

[0058] The embodiments described above are only typical embodiments, but the utility model is not limited to these embodiments, and those skilled in the art can make modifications without departing from the spirit and enlightenment of the utility model. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to replace some of the technical features therein by equivalents. Any modifications, equivalent replacements, improvements, etc. made within the creative spirit and creative concept of the utility model should be included in the protection scope of the utility model. Therefore, the protection scope is not limited to the above description.

Claims

1. A water-saving and energy-saving oil well heating furnace, which is equipped with an electric control cabinet, a water storage bag and a furnace body. The electric control cabinet is equipped with an automatic control module, and the top of the furnace body is equipped with a safety valve and a water storage bag, which is characterized by: The water storage bag is connected to the furnace body through a condenser and an overflow pipe; the vacuum pump connected to the water storage bag through an exhaust pipe is connected to the automatic control module in the electric control cabinet through a cable; the electric contact negative pressure gauge connected to the automatic control module in the electric control cabinet through a cable is installed at the upper end of the furnace body and is connected to the furnace body.

2. A water-saving and energy-saving oil well heating furnace as claimed in claim 1, characterized in that: The lower end of the overflow pipe in the water storage bag is immersed in the heating water in the furnace body.

3. A water-saving and energy-saving oil well heating furnace as claimed in claim 2, characterized in that: The immersion depth of the lower end of the overflow pipe immersed in the heating water is set between 8cm and 15cm.

4. A water-saving and energy-saving oil well heating furnace as claimed in claim 1, 2 or 3, characterized in that: The condenser tube in the water storage bag is a U-shaped tube and bends above the condensed water level in the water storage bag. The inlet of the condenser tube is connected to the furnace body, and the outlet of the condenser tube bends downward and is immersed in the condensed water in the water storage bag.

5. The water-saving and energy-saving oil well heating furnace according to claim 1, characterized in that: A control valve is arranged in the air extraction pipe between the air extraction pump and the water storage bag.

6. A water-saving and energy-saving oil well heating furnace as claimed in claim 2 or 3, characterized in that: The heating water is tap water or purified water.

7. The water-saving and energy-saving oil well heating furnace according to claim 1, characterized in that: The safety valve installed on the top of the furnace body is a diaphragm safety valve.

8. A water-saving and energy-saving oil well heating furnace as claimed in claim 4, characterized in that The outer wall of the water storage bag is also equipped with a movable water storage bag insulation cover, which is provided with an insulation cover sheet, a connecting hook and a rotating shaft. The insulation cover sheet is provided with two sheets, one end of which is connected by a rotating shaft and the other end is fixed by a connecting hook.

9. A water-saving and energy-saving oil well heating furnace as claimed in claim 8, characterized in that: The thermal insulation package sheet is composed of an outer layer and a filling layer, the outer layer is a 0.5mm-1mm stainless steel plate, and the filling layer is rock wool.

10. The water-saving and energy-saving oil well heating furnace according to claim 9, characterized in that: The coil in the furnace body is fixed above the heating water.

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