Bottom bottom heating device for oil well exploitation

Abstract

The invention relates to the technical field of oil well exploitation, in particular to a well bottom heating device for oil well exploitation, which comprises an upper connecting seat, a heating pipe, a lower connecting seat and a dry type electric heater, the upper connecting seat and the lower connecting seat are connected through more than one heating pipe, and a closed medium chamber is formed among the upper connecting seat, the lower connecting seat and the heating pipe; a dry type electric heater used for heating gas in the medium cavity is assembled in the medium cavity. According to the well bottom heating device for oil well exploitation, the dry-type electric heater is adopted to heat gas in the medium cavity formed among the upper connecting base, the lower connecting base and the heating pipe, heat exchange is conducted between the gas and crude oil in an oil well through the heating pipe after the gas is heated, the heating state of the dry-type electric heater is stable, and the dry-type electric heater is not prone to being burnt out; and the problems of explosion and the like are not easy to occur.

Description

Technical Field

[0001] The present invention relates to the technical field of oil well exploitation, and more particularly to a bottom hole heating device used for oil well exploitation. Background Art

[0002] The quality of crude oil in most oil fields in my country is lower than that in the Middle East. The sulfur and wax contents are relatively high, and the oil viscosity is also relatively high. The self-flowing oil wells with high initial production often have reduced self-flowing capacity even before the mid-term of oil production. This is because the wax often condenses on the wall of the oil well pipe and causes blockage, which requires regular wax removal. Wax removal is very troublesome and greatly reduces the crude oil productivity. The most primitive wax removal method is to scrape the wax. There are also other heating methods to remove the wax. Although it is more economical, it is not very convenient to use. In the process of heavy oil and high-condensation oil production, due to the high viscosity of crude oil or wax deposition in the wellbore, coupled with the skin effect of heavy oil and high-condensation oil, the production of the oil well is seriously affected, and even the oil well is shut down.

[0003] In the prior art, the solution to the wax deposition in crude oil in the well is to heat the crude oil. At present, heating is generally performed by heating cables. Heating cables are a simple method to reduce the viscosity of crude oil and clean the wax deposition, thereby improving oil recovery efficiency.

[0004] However, when the cable is in use, the temperature resistance level of the cable is low, the surface is easily damaged, and maintenance is difficult; when used in an oil well, the temperature at the bottom of the well is too high, and the cable's temperature resistance is poor, which can cause adhesion, scrapping, and other phenomena. The leakage or breakage problem is too serious, and the safety is poor; and because the oil well is deep, the cable is used to directly go in for heating, which consumes a lot of electricity. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a bottom-hole heating device for oil well exploitation.

[0006] The technical solution adopted by the present invention is: A bottom hole heating device for oil well exploitation comprises: an upper connecting seat, a heating pipe, a lower connecting seat and a dry electric heater; the upper connecting seat and the lower connecting seat are connected by one or more heating pipes, and a closed medium chamber is formed between the upper connecting seat, the lower connecting seat and the heating pipe; the medium chamber is equipped with a dry electric heater for heating the gas inside the medium chamber.

[0007] Furthermore, the bottom hole heating device for oil well exploitation also includes: a cleaning structure connected to the heating pipe to clean the coke layer generated when the heating pipe heats the oil.

[0008] Furthermore, the cleaning structure includes: a driving motor installed in the mounting cavity of the lower connecting seat; a wiring tube for passing cables is also connected between the upper connecting seat and the lower connecting seat, the cables are electrically connected to the driving motor, the rotating shaft of the driving motor is connected to the driving screw, the rotating shaft or the driving screw is sealed and rotated in the shaft hole of the lower connecting seat, the driving screw is threadedly matched with the internal threaded hole of the cleaning disk, and the cleaning disk is slidably matched on the heating tube and the wiring tube through the cleaning scraper hole.

[0009] Furthermore, a ceramic cleaning sleeve is installed in the cleaning scraping hole of the cleaning disk, and the ceramic cleaning sleeve is slidably matched on the outer tube surface of the heating tube or the outer tube surface of the wiring tube.

[0010] Furthermore, the wiring tube and the plurality of heating tubes are evenly arranged around the outside of the driving screw, and one end of the driving screw away from the driving motor shaft is rotatably connected to the center of the lower surface of the upper connecting seat.

[0011] Furthermore, the top of the cleaning disk is provided with an upper arc surface structure whose horizontal height gradually increases from the outside to the inside, and the bottom of the cleaning disk is provided with a lower arc surface structure whose horizontal height gradually decreases from the outside to the inside; the spacing between the upper arc surface structure and the lower arc surface structure close to one end of the driving screw is greater than the spacing between the upper arc surface structure and the lower arc surface structure away from one end of the driving screw; the top and bottom of the cleaning scraper hole pass through the upper arc surface structure and the lower arc surface structure respectively.

[0012] Furthermore, the bottom hole heating device for oil well exploitation also includes: an annular reinforcement seat, a plurality of annular reinforcement seats are evenly fixed on the heating tube and the wiring tube from top to bottom; the annular reinforcement seats located at the top and bottom of the heating tube and the wiring tube are respectively connected to the upper connecting seat and the lower connecting seat; the driving screw includes: a plurality of screw bodies connected end to end, the driving motor is connected to a screw body located at the bottom, and the connecting ends of two adjacent screw bodies are rotatably engaged in the center hole of an annular reinforcement seat; a cleaning disc is threadedly connected to the screw body between two adjacent annular reinforcement seats.

[0013] Furthermore, the dry electric heater is a dry electric heating rod, and two ends of the dry electric heating rod are respectively sealed and fixedly connected to the upper connecting seat and the lower connecting seat.

[0014] Furthermore, the dry electric heating rod and the heating tube are coaxially arranged, and there is a gap between the dry electric heating rod and the heating tube.

[0015] Furthermore, the heating tube is a titanium alloy tube.

[0016] It can be seen from the above scheme that the beneficial effects of the present invention are: The bottom hole heating device for oil well exploitation of the present invention is different from the heating cable for heating crude oil in the oil well. The present invention has high safety and is not prone to leakage and breakage. In the bottom hole heating device for oil well exploitation of the present invention, a dry electric heater is used to heat the gas in the medium chamber formed between the upper connecting seat, the lower connecting seat and the heating tube, and after the gas is heated, heat is exchanged with the crude oil in the oil well through the heating tube. The heating state of the dry electric heater is relatively stable and not easy to burn out. In addition, the dry electric heater heats the gas and exchanges heat through the heating tube, so the heating is safer and is not prone to explosion and other problems.

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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: Figure 1 A front view of a bottom hole heating device for oil well exploitation provided by an embodiment of the present invention; Figure 2 A first-perspective stereoscopic view of a bottom-hole heating device for oil well exploitation provided by an embodiment of the present invention; Figure 3 A second perspective stereoscopic image of a bottom hole heating device for oil well exploitation provided by an embodiment of the present invention; Figure 4 A partial schematic diagram of a bottom hole heating device for oil well exploitation provided by an embodiment of the present invention; Figure 5 A schematic diagram of a heating tube and a dry electric heater provided in an embodiment of the present invention; Figure 6 A schematic diagram of a cleaning plate provided by an embodiment of the present invention from a first perspective; Figure 7 A schematic diagram of a cleaning plate provided by an embodiment of the present invention from a second viewing angle; Figure 8 A schematic diagram of a cleaning plate provided by an embodiment of the present invention from a third viewing angle; Fig. 9 A schematic diagram of an annular reinforcement seat provided in an embodiment of the present invention; Fig.10 A schematic diagram of a screw body, a cleaning disc, a turbulent impeller mechanism and a movable cleaning mechanism provided in an embodiment of the present invention; Fig.11 A schematic diagram of a spoiler impeller mechanism and a movable cleaning mechanism provided in an embodiment of the present invention; Fig.12A schematic diagram of a spoiler impeller mechanism provided in an embodiment of the present invention; Fig.13 A schematic diagram of a movable cleaning mechanism provided by an embodiment of the present invention; Fig.14 A partial schematic diagram of a screw body provided in an embodiment of the present invention.

[0019] Among them: upper connecting seat 1; heating tube 2; lower connecting seat 3; dry electric heater 4; driving screw 5; screw body 501; cleaning disc 6; internal threaded hole 601; cleaning scraping hole 602; upper arc surface structure 603; lower arc surface structure 604; wiring tube 7; spoiler impeller mechanism 8; central rotating tube 801; transmission slider 802; spoiler blade 803; active friction wheel 804; movable cleaning mechanism 9; movable slide 901; movable cleaning tube 902; driven friction wheel 903; inclined groove 904; coke breaking scraper 905; annular reinforcement seat 10. DETAILED DESCRIPTION

[0020] In order to clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention, it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0022] See also Figure 1-Figure 14 The present invention provides a bottom hole heating device for oil well exploitation, comprising: an upper connecting seat 1, a heating pipe 2, a lower connecting seat 3 and a dry electric heater 4; the upper connecting seat 1 and the lower connecting seat 3 are connected by one or more heating pipes 2, and a closed medium chamber is formed between the upper connecting seat 1, the lower connecting seat 3 and the heating pipe 2; the medium chamber is equipped with a dry electric heater 4 for heating the gas therein.

[0023] The working principle and technical effects of the above technical solution are as follows: The bottom hole heating device for oil well exploitation of the present invention connects the lifting lug on the upper connecting seat 1 to the lifting device through a lifting rope when heating the crude oil inside the oil well, so that the bottom hole heating device can be smoothly inserted into the oil well under the control of the lifting device to meet the heating requirements at different depths; during heating, the dry electric heater 4 is controlled to be powered on and started, and after the dry electric heater 4 is started, the gas in the medium chamber formed between the upper connecting seat 1, the lower connecting seat 3 and the heating tube 2 is heated, and after the gas is heated, heat is exchanged with the external crude oil through the heating tube 2. Compared with the prior art of directly putting the cable or wet electric heater directly into the oil well for heating, the dry electric heater 4 in the present invention does not directly contact the crude oil, has high safety, and is not prone to leakage and breakage; because when heating the crude oil, the cable or wet electric heater is directly put into the oil well for heating, the heat exchange difference is large, the surface temperature of the cable or wet electric heater is high, and the coking problem is more serious. A thick coke layer is formed on the surface of the dry electric heater, which seriously affects the heat exchange efficiency, the heat cannot be extracted, the temperature of the cable or the wet electric heater rises rapidly and cannot be effectively heated, and it is very easy to cause cracking and explosion problems; in the present invention, a dry electric heater 4 is used to heat the gas in the medium chamber, and then heat is exchanged. Although the problem of coking will occur, the heat exchange effect of the air is not particularly high, and the heat exchange difference will not be particularly large. Therefore, although coking and a coke layer will also occur on the outer wall of the heating tube 2, the dry electric heater 4 is not in direct contact with the heating tube 2, and generally no cracking and explosion problems will occur. While ensuring the heating effect of crude oil, the present invention greatly improves the safety during heating, and the service life of the present invention is long, which is conducive to reducing the cost of oil production and ensuring the efficiency of oil production. Compared with the heating cable placed in the well for heating, the energy consumption of the present invention is low, which effectively saves energy; The specific advantages of the above technical solution are as follows: 1. High safety: Dry electric heaters heat gas instead of liquid, which can avoid direct contact with the oil in the oil well and reduce the risk of leakage and short circuit. At the same time, gas heating is more stable than liquid heating and is less prone to explosion or combustion accidents.

[0024] 2. Strong reliability: The working environment of dry electric heater is dry gas, which is conducive to extending the service life of the equipment and reducing the maintenance frequency. In contrast, the heating cable is immersed in oil for a long time and may be damaged due to corrosion or other chemical reactions.

[0025] 3. High efficiency: Heat exchange through heating pipes can effectively transfer heat to the oil in the oil well and improve heating efficiency. The design of heating pipes can also include structures that enhance heat transfer, such as fins or special materials, to maximize the heat exchange effect.

[0026] 4. Easy to control: The dry electric heater is connected to the temperature control system equipped in the present invention, which can accurately adjust the heating temperature to ensure that the oil in the oil well reaches the ideal mining temperature while avoiding waste of resources and potential dangers caused by overheating.

[0027] The bottom hole heating device for oil well exploitation of the present invention provides a safe, reliable and efficient oil well heating solution, and has obvious advantages over traditional heating cables.

[0028] Since crude oil contains high sulfur and wax contents and has high oil viscosity, coking is unavoidable during crude oil heating. In the prior art, cable heating cannot effectively solve the problem of coking on the outer wall of the cable, causing the cable to be easily ruptured and damaged. In the present invention, in order to solve the problem of coking on the outer wall of the heating tube 2 when the heating tube 2 heats crude oil, the bottom hole heating device for oil well exploitation also includes: a cleaning structure connected to the heating tube 2 to clean the coke layer generated when the heating tube 2 heats the oil. The coke layer generated when the heating tube 2 heats the oil can be cleaned to effectively ensure the heat exchange efficiency and heat exchange effect of the heating tube 2, and reduce the energy waste and unsafe problems caused by the inability to effectively heat the gas inside the heating tube 2 after heating.

[0029] Furthermore, in the present invention, the cleaning structure includes: a driving motor installed in the mounting cavity of the lower connecting seat 3; a wiring tube 7 for passing cables is also connected between the upper connecting seat 1 and the lower connecting seat 3, the cables are electrically connected to the driving motor, the rotating shaft of the driving motor is connected to the driving screw 5, the rotating shaft or the driving screw 5 is sealed and rotated in the through-shaft hole of the lower connecting seat 3, the driving screw 5 is threadedly matched with the internal threaded hole 601 of the cleaning disk 6, and the cleaning disk 6 is slidably matched on the heating tube 2 and the wiring tube 7 through the cleaning scraper hole 602.

[0030] The working principle and technical effects of the above technical solution are as follows: The driving motor is installed in the installation cavity of the lower connecting seat 3, which has good sealing performance and will not cause leakage and other problems, ensuring safety during use. A wiring tube 7 for passing cables is also connected between the upper connecting seat 1 and the lower connecting seat 3. The cables are electrically connected to the driving motor, which is convenient for wiring. The rotating shaft of the driving motor and the driving screw 5 can drive the driving screw 5 to rotate after the driving motor is started. When the driving screw 5 rotates, its contact position with the inner threaded hole 601 of the cleaning disk 6 changes, thereby controlling the cleaning disk 6 to pass through the cleaning scraping hole 602 between the heating tube 2 and the wiring tube 7. When the cleaning plate 6 slides upward, the coke layer on the heating tube 2 and the wiring tube 7 is cleaned through the cleaning scraping hole 602, and the impurities adhering to the heating tube 2 and the wiring tube 7 are effectively removed. The driving motor adopts a bidirectional motor that can perform forward and reverse rotation, thereby controlling the driving screw 5 to perform forward and reverse rotation. The driving screw 5 drives the driving screw 5 to rotate clockwise and counterclockwise through forward and reverse rotation, thereby realizing the control of the cleaning plate 6 to rise and fall on the heating tube 2 and the wiring tube 7, and completing the cleaning work at different positions of the heating tube 2 and the wiring tube 7; The specific advantages of the above technical solution are as follows: 1. Automatic cleaning function: The driving motor drives the driving screw 5 and the cleaning disc 6 to automatically clean the coke layer on the heating tube 2 and the wiring tube 7; this not only improves the cleaning efficiency, but also reduces manual intervention, and reduces the complexity of operation and labor intensity.

[0031] 2. Bidirectional control: The driving motor can rotate forward and reverse, which enables the cleaning disc 6 to slide up and down on the heating tube 2 and the wiring tube 7, so as to clean the coke layer at different positions and ensure the comprehensive cleaning of the heating tube 2 and the wiring tube 7.

[0032] 3. Easy maintenance: Through the cooperation of the driving motor and the driving screw 5, the design of the cleaning structure makes the cleaning work of the present invention easier and more efficient, reducing maintenance time and cost.

[0033] 4. Save energy: Since the cleaning disc can effectively remove the coke layer, it ensures efficient heat exchange of the heating tube, thereby reducing energy waste and lowering operating costs.

[0034] 5. Improve equipment life: By regularly cleaning the coke layer, the corrosion and wear of the heating tube 2 and the wiring tube 7 can be reduced, thereby extending the service life of the equipment.

[0035] In addition, in the present invention, the drive motor is installed in the installation cavity of the lower connecting seat 3, which also has the following advantages: 1. Add counterweight to enhance equipment stability The drive motor is installed at the bottom of the device as a counterweight, which can lower the center of gravity of the entire device and improve the stability of the equipment. During the oil well mining process, the bottom environment is complex and there may be vibration or fluid impact. After the counterweight is enhanced, the equipment can better resist external interference, reduce the risk of shaking or tilting, and ensure stable operation of the equipment.

[0036] 2. Improve cleaning efficiency The drive motor acts as a counterweight, which can provide more stable support for the cleaning disc and ensure that the cleaning disc slides more smoothly on the heating tube and the wiring tube; the movement of the cleaning disc is smoother, which can more effectively clean the coke layer and avoid incomplete cleaning caused by equipment shaking or deviation; and after the counterweight is enhanced, the equipment is more stable during operation, reducing energy loss caused by vibration or shaking; after the counterweight is enhanced, the vibration and impact to the equipment during operation are reduced, reducing mechanical wear and fatigue.

[0037] A ceramic cleaning sleeve is installed in the cleaning scraping hole 602 of the cleaning plate 6 , and the ceramic cleaning sleeve is slidably fitted on the outer tube surface of the heating tube 2 or the outer tube surface of the wiring tube 7 .

[0038] The working principle and technical effects of the above technical solution are as follows: The ceramic cleaning sleeve is in direct contact with the outer walls of the heating tube 2 and the wiring tube 7. The ceramic material has high hardness and a smooth surface. It can efficiently scrape off the coke layer during the sliding process to ensure the cleanliness of the outer walls of the heating tube and the wiring tube, thereby improving the heat exchange efficiency and equipment operation efficiency; and the ceramic material has excellent corrosion resistance and can withstand the corrosion of high-sulfur, high-wax, and high-viscosity crude oil in oil wells. During long-term use, the ceramic cleaning sleeve is not easily corroded, can maintain stable cleaning performance, and extend the service life of the cleaning structure; the ceramic material has high hardness and strong wear resistance, and can withstand frequent friction with the outer walls of the heating tube and the wiring tube during the cleaning process; the ceramic cleaning sleeve is not easy to wear during long-term use, reducing the replacement frequency and reducing maintenance costs; the ceramic cleaning sleeve has a smooth surface and is in softer contact with the outer walls of the heating tube and the wiring tube, avoiding scratches or wear that may be caused by metal cleaning components; the ceramic material also has excellent high-temperature stability and can maintain stable performance in the high-temperature environment at the bottom of the oil well. By installing a ceramic cleaning sleeve in the cleaning scraping hole 602 of the cleaning disk 6, this solution significantly improves the cleaning effect and has excellent corrosion resistance, wear resistance and high temperature stability. The use of the ceramic cleaning sleeve not only prolongs the life of the equipment and reduces maintenance costs, but also improves the safety and reliability of equipment operation, and is particularly suitable for use in the harsh environment of oil well exploitation.

[0039] The wiring tube 7 and the plurality of heating tubes 2 are evenly arranged around the outside of the driving screw 5 , and one end of the driving screw 5 away from the driving motor shaft is rotatably connected to the center of the lower surface of the upper connecting seat 1 .

[0040] The working principle and technical effects of the above technical solution are as follows: The above scheme is achieved by evenly arranging the wiring tube 7 and multiple heating tubes 2 around the outside of the driving screw 5, and the wiring tube 7 and multiple heating tubes 2 are evenly arranged around the outside of the driving screw 5, so that the cleaning disk 6 can cover various positions of the outer wall of the heating tube and the wiring tube when moving up and down; the cleaning disk 6 can evenly clean the outer wall of each heating tube and wiring tube, avoiding cleaning dead corners and ensuring the comprehensive removal of coke layers and impurities; the end of the driving screw 5 away from the driving motor shaft is rotatably connected to the center of the lower surface of the upper connecting seat 1, and the overall structure is compact and symmetrical; this design simplifies the equipment structure, reduces the number of components, reduces the complexity of manufacturing and installation, and improves the reliability of the equipment; the central connection method of the driving screw 5 makes the up and down movement of the cleaning disk 6 more stable; the cleaning disk 6 will not deviate or shake during the movement, ensuring the stability and consistency of the cleaning effect.

[0041] The top of the cleaning disk 6 is provided with an upper arc surface structure 603 whose horizontal height gradually increases from the outside to the inside, and the bottom of the cleaning disk 6 is provided with a lower arc surface structure 604 whose horizontal height gradually decreases from the outside to the inside; the distance between the upper arc surface structure 603 and the lower arc surface structure 604 close to one end of the driving screw 5 is greater than the distance between the upper arc surface structure 603 and the lower arc surface structure 604 away from one end of the driving screw 5; the top and bottom of the cleaning scraping hole 602 respectively pass through the upper arc surface structure 603 and the lower arc surface structure 604.

[0042] The upper arc surface structure 603 and the lower arc surface structure 604 of the cleaning disk 6 form two diverter head structures whose horizontal heights gradually decrease from the middle of the cleaning disk 6 to the outside. The top and bottom of the cleaning scraping hole 602 respectively penetrate the upper arc surface structure 603 and the lower arc surface structure 604. When the cleaning disk 6 moves, the crude oil flows from the center of the cleaning disk 6 to the outside of the cleaning disk 6, so that the coke layer and other impurities scraped off by the cleaning disk 6 move outward under the diversion effect of the crude oil, reducing the accumulation of coke layer and other impurities at the connection between the cleaning disk 6 and the driving screw 5, preventing the cleaning disk 6 from squeezing the coke layer into the thread groove of the cleaning disk 6 and the driving screw 5 when contacting the driving screw 5, and solving the problem that the coke layer and impurities are easily accumulated at the connection between the cleaning disk and the driving screw during the cleaning process of the traditional cleaning structure, resulting in movement obstruction; The specific advantages of the above technical solution are as follows: 1. Prevent the accumulation of coke layer and impurities The design of the upper arc surface structure 603 and the lower arc surface structure 604 enables the crude oil to flow from the center to the outside when the cleaning disc 6 moves, driving the scraped coke layer and impurities to move outward. The coke layer and impurities are guided to flow outward, reducing the difficulty of cleaning the connection between the cleaning disc 6 and the driving screw 5; avoiding the accumulation of coke layer and impurities at the connection between the cleaning disc 6 and the driving screw 5, preventing impurities from entering the thread groove, and ensuring smooth movement of the cleaning disc 6 and the driving screw 5.

[0043] 2. Improve cleaning efficiency The diverter head structure can effectively guide the coke layer and impurities to flow outward, reducing the resistance of the cleaning disc 6 during movement; making the up and down movement of the cleaning disc 6 smoother, significantly improving the cleaning efficiency, and reducing the time required for cleaning.

[0044] 3. Reduce equipment failure rate Preventing coke layers and impurities from entering the thread groove avoids jamming or obstruction of the cleaning disc 6 and the driving screw 5 during movement; making the equipment run more stably, reducing downtime due to cleaning structure failure, and improving equipment reliability; reducing wear and corrosion of the cleaning disc 6 and the driving screw 5 by coke layers and impurities; extending the service life of the cleaning disc 6 and the driving screw 5, reducing the frequency of maintenance and replacement.

[0045] 4. Optimize fluid flow The design of the upper arc surface structure 603 and the lower arc surface structure 604 can guide the flow of crude oil and form a natural diversion effect; make the crude oil flow smoother, reduce flow resistance, improve the uniformity and efficiency of crude oil heating, and improve the uniformity of heating.

[0046] The bottom hole heating device for oil well exploitation also includes: an annular reinforcement seat 10, multiple annular reinforcement seats 10 are evenly fixed on the heating tube 2 and the wiring tube 7 from top to bottom; the annular reinforcement seats 10 located at the top and bottom of the heating tube 2 and the wiring tube 7 are respectively connected to the upper connecting seat 1 and the lower connecting seat 3; the driving screw 5 includes: multiple screw bodies 501 connected end to end, the driving motor is connected to a screw body 501 located at the bottom, and the connecting ends of two adjacent screw bodies 501 are rotatably fitted in the center hole of an annular reinforcement seat 10; a cleaning disc 6 is threadedly connected to the screw body 501 between two adjacent annular reinforcement seats 10.

[0047] The working principle and technical effects of the above technical solution are as follows: The driving motor can drive a screw body 501 connected thereto to rotate, and when the screw body 501 rotates, it drives the other multiple screw bodies 501 connected end to end to rotate. The screw bodies 501 between two adjacent annular reinforcement seats 10 are all threadedly connected with cleaning discs 6. When each screw body 501 rotates, it drives a cleaning disc 6 to move, and the outer walls of the heating tube 2 and the wiring tube 7 are divided into multiple cleaning areas, and multiple cleaning discs 6 are used to perform synchronous cleaning; The technical effects of the above scheme are as follows: 1. Improve structural stability A plurality of annular reinforcement seats 10 are evenly fixed on the heating tube 2 and the wiring tube 7 from top to bottom, which significantly enhances the overall structural stability of the heating tube 2 and the wiring tube 7, and can effectively disperse the load of the heating tube 2 and the wiring tube 7 to prevent deformation or damage caused by high pressure or external force.

[0048] 2. Simplify the connection method of the drive screw Multiple screw bodies 501 connected end to end are rotatably matched through the center hole of the annular reinforcement seat 10, which simplifies the connection method of the screws; this design reduces the complexity of the screw connection, reduces the difficulty of installation and maintenance, and improves the rotation flexibility of the screws.

[0049] 3. Achieve segmented cleaning A cleaning disc 6 is threadedly connected to the screw body 501 between two adjacent annular reinforcement seats 10, dividing the outer walls of the heating tube and the wiring tube into multiple cleaning areas; each cleaning disc 6 is responsible for a cleaning area, thereby realizing segmented cleaning of the outer walls of the heating tube 2 and the wiring tube 7, ensuring comprehensiveness and uniformity of cleaning; multiple cleaning discs 6 work simultaneously, greatly improving cleaning efficiency and shortening cleaning time.

[0050] By introducing an annular reinforcement seat 10 and multiple screw bodies 501 connected end to end, and combining the synchronous cleaning design of the cleaning disk 6, the structural stability, cleaning efficiency and uniformity of the bottom hole heating device are significantly improved, while the connection method and design complexity of the equipment are simplified, making it suitable for use in high-sulfur, high-salt, and highly corrosive oil well environments, ensuring stable operation and efficient cleaning of the equipment.

[0051] The dry electric heater 4 is a dry electric heating rod, and the two ends of the dry electric heating rod are respectively sealed and fixedly connected to the upper connecting seat 1 and the lower connecting seat 3; the dry electric heating rod and the heating tube 2 are coaxially arranged, and there is a gap between the dry electric heating rod and the heating tube 2; the heating tube 2 is a titanium alloy tube.

[0052] The working principle and technical effects of the above technical solution are as follows: The two ends of the dry electric heating rod are respectively sealed and fixedly connected to the upper connecting seat 1 and the lower connecting seat 3, and the overall structure is compact; the installation and disassembly process of the equipment is simplified, and the installation time and complexity are reduced; the dry electric heating rod and the heating tube 2 are coaxially arranged, and there is a certain gap between the two to ensure uniform transfer of heat energy; the heat energy can be more efficiently and evenly transferred to the outer wall of the heating tube 2, thereby improving the heating efficiency and reducing energy waste; the heating tube 2 is made of titanium alloy material and has excellent corrosion resistance. In the oil well environment, it can withstand the erosion of high sulfur, high salt, and highly corrosive media, ensuring the long-term and stable operation of the heating tube 2. The dry electric heating rod can provide a stable high-temperature heat source, and the titanium alloy material can maintain stable performance in a high-temperature environment, so that the present invention can work normally in the high-temperature environment at the bottom of the oil well, ensuring the continuity and high efficiency of crude oil heating; the two ends of the dry electric heating rod are sealed and fixedly connected to the upper connecting seat 1 and the lower connecting seat 3 to ensure no leakage, avoiding contact between the electric heating rod and the external medium, improving the safety and reliability of the equipment, and reducing the risk of leakage; there is a certain gap between the dry electric heating rod and the heating tube 2, and the heat energy transfer is more efficient, reducing heat loss and improving energy utilization; the temperature of the outer wall of the heating tube 2 is uniform, which improves the heat exchange efficiency and ensures the uniformity and high efficiency of crude oil heating.

[0053] The top and bottom of each cleaning disc 6 are respectively connected to a flow-disturbing impeller mechanism 8, and the two flow-disturbing impeller mechanisms 8 are relatively arranged at the upper and lower ends of the cleaning disc 6, so that the crude oil in contact with the flow-disturbing impeller mechanism 8 is thrown to the surroundings of the flow-disturbing impeller mechanism 8, thereby quickly pushing the coke layer scraped off by the cleaning disc 6 away from the screw body. The flow-disturbing impeller mechanism 8 includes: a central rotating tube 801 that is slidably fitted on the outer side of the screw body 501, the central rotating tube 801 is coaxially connected to the annular opening groove at the top or bottom of the cleaning disc 6, and the transmission slider 802 fixed to the inner wall of the central rotating tube 801 is slidably fitted in the axial slide groove 502 on the outer side of the screw body 501; and multiple flow-disturbing blades 803 are evenly fixed around the outer tube wall of the central rotating tube 801.

[0054] When the screw body 501 rotates, the cooperation of the axial groove 502 and the transmission slider 802 can drive the central rotating tube 801 to rotate in the annular opening groove of the cleaning disk 6, thereby driving the multiple spoiler blades 803 on the central rotating tube 801 to rotate and orbit. The spoiler blades 803 throw the crude oil to the surroundings, and the coke layer and impurities are quickly pushed to the outside, avoiding the accumulation of the coke layer at the connection between the cleaning disk 6 and the screw body 501, reducing the cleaning resistance, and ensuring the smooth movement of the cleaning disk 6 and the screw body 501; the rotating and orbiting movement of the spoiler blades 803 can significantly enhance the spoiler effect of the crude oil; the crude oil flows more violently, which can better drive the coke layer and impurities to move outward, further improving the cleaning effect; when the screw body 501 rotates, the cooperation of the axial groove 502 and the transmission slider 802 drives the central rotating tube 801 to rotate, and the central rotating tube 801 and the screw body 501 are linked, which simplifies the driving structure and reduces additional driving components. The rotating and circumferential motion of the turbulent impeller mechanism 8 can guide the flow of crude oil, reduce flow resistance, make the crude oil flow smoother, reduce the retention of crude oil near the cleaning disk 6, and further improve the cleaning efficiency; in addition, the turbulent effect of the turbulent impeller mechanism 8 can improve the flow distribution of crude oil, make the crude oil flow more uniform, reduce the temperature unevenness near the heating tube 2, and improve the uniformity of crude oil heating.

[0055] A movable cleaning mechanism 9 is respectively provided on the top and bottom of each cleaning plate 6, and the two movable cleaning mechanisms 9 are connected one by one with the two turbulent impeller mechanisms 8; the movable cleaning mechanism 9 comprises: a movable slide 901 rotatably connected to the central rotating tube 801, and the four sides of the movable slide 901 are rotatably connected to four movable cleaning tubes 902, and the four movable cleaning tubes 902 are slidably matched with the three heating tubes 2 and the wiring tube 7 one by one; the end surface of the movable cleaning tube 902 away from the cleaning plate 6 is connected to the central rotating tube 801 The end surface of the side away from the cleaning disk 6 is coplanar; the four movable cleaning tubes 902 are fixed with driven friction wheels 903 at one end close to the cleaning disk 6, and the four driven friction wheels 903 are frictionally connected with the active friction wheel 804 fixed on the central rotating tube 801; a plurality of inclined grooves 904 are provided on the end surface of the movable cleaning tube 902 away from the cleaning disk 6, so that a plurality of spaced apart coke breaking scrapers 905 are formed at the end of the movable cleaning tube 902 away from the cleaning disk 6; the movable slide 901 is located between the spoiler blades 803 and the cleaning disk 6.

[0056] The working principle and technical effects of the above technical solution are as follows: When the central rotating tube 801 rotates, it drives the active friction wheel 804 to rotate, and the rotation of the active friction wheel 804 drives the four driven friction wheels 903 to rotate, and the rotation of the four driven friction wheels 903 drives the four movable cleaning tubes 902 to rotate. The rotation of the four movable cleaning tubes 902 can rotate and grind and remove the coke layer on the three heating tubes 2 and the one wiring tube 7, and a plurality of inclined grooves 904 are provided on the end surface of the movable cleaning tube 902 away from the cleaning disk 6, so that a plurality of intervally arranged coke breaking scrapers 905 are formed on the end of the movable cleaning tube 902 away from the cleaning disk 6, so as to improve the coke breaking of the coke layer. Cleaning effect, the end face of the movable cleaning tube 902 away from the cleaning plate 6 is coplanar with the end face of the central rotating tube 801 away from the cleaning plate 6, which solves the problem that part of the tube bodies of the three heating tubes 2 and the wiring tube 7 cannot be effectively cleaned due to the design of the upper arc surface structure 603 and the lower arc surface structure 604 of the cleaning plate 6. As shown in Figure 13, the structure of the movable slide 901 is arranged in such a way that a gap is provided between the frames of the movable slide 901 carrying two adjacent movable cleaning tubes 902, so that it does not affect the diversion and flow breaking effects of the upper arc surface structure 603 and the lower arc surface structure 604.

[0057] The rotary grinding of the movable cleaning tube 902 and the design of the coke-breaking scraper 905 can effectively remove the coke layer on the heating tube and the wiring tube. The coke layer is quickly and thoroughly removed, avoiding the decrease in cleaning efficiency caused by the accumulation of the coke layer; the coke-breaking scraper 905 can penetrate into the coke layer for cleaning through the setting of the inclined groove 904, and the coke layer is thoroughly broken and removed, ensuring the depth and comprehensiveness of the cleaning. The coplanar design of the end faces of the movable cleaning tube 902 and the central rotating tube 801 solves the problem that the arc surface structure of the cleaning disk 6 cannot completely cover part of the heating tube and the wiring tube; eliminates the cleaning blind spot, ensuring that all tubes can be effectively cleaned. The gap design of the movable slide 901 ensures that the diversion and flow breaking effects of the upper arc surface structure 603 and the lower arc surface structure 604 are not affected; the resistance during the cleaning process is smaller, reducing the energy consumption and vibration of the equipment during operation.

[0058] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0059] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A bottom hole heating device for oil well exploitation, characterized in that: include: An upper connecting seat (1), a heating tube (2), a lower connecting seat (3) and a dry electric heater (4); the upper connecting seat (1) and the lower connecting seat (3) are connected via one or more heating tubes (2), and a sealed medium chamber is formed between the upper connecting seat (1), the lower connecting seat (3) and the heating tube (2); and a dry electric heater (4) is installed in the medium chamber for heating the gas therein.

2. The bottom hole heating device for oil well exploitation according to claim 1 is characterized in that: Also includes: A cleaning structure connected to the heating pipe (2) is used to clean the coke layer generated when the heating pipe (2) heats the petroleum.

3. The bottom hole heating device for oil well exploitation according to claim 2 is characterized in that: The cleaning structure comprises: a driving motor installed in the installation cavity of the lower connecting seat (3); a wiring tube (7) for passing a cable is also connected between the upper connecting seat (1) and the lower connecting seat (3); the cable is electrically connected to the driving motor; the rotating shaft of the driving motor is connected to the driving screw (5); the rotating shaft or the driving screw (5) is sealed and rotated in the through-shaft hole of the lower connecting seat (3); the driving screw (5) is threadedly matched with the internal threaded hole (601) of the cleaning disk (6); the cleaning disk (6) is slidably matched on the heating tube (2) and the wiring tube (7) through the cleaning scraping hole (602).

4. The bottom hole heating device for oil well exploitation according to claim 3 is characterized in that: A ceramic cleaning sleeve is installed in the cleaning scraping hole (602) of the cleaning plate (6), and the ceramic cleaning sleeve is slidably fitted on the outer tube surface of the heating tube (2) or the outer tube surface of the wiring tube (7).

5. The bottom hole heating device for oil well exploitation according to claim 3 is characterized in that: The wiring tube (7) and the plurality of heating tubes (2) are evenly arranged around the outside of the driving screw (5), and one end of the driving screw (5) away from the driving motor shaft is rotatably connected to the center of the lower surface of the upper connecting seat (1).

6. The bottom hole heating device for oil well exploitation according to claim 5, characterized in that: The top of the cleaning disc (6) is provided with an upper curved surface structure (603) whose horizontal height gradually increases from the outside to the inside, and the bottom of the cleaning disc (6) is provided with a lower curved surface structure (604) whose horizontal height gradually decreases from the outside to the inside; the spacing between the upper curved surface structure (603) and the lower curved surface structure (604) close to one end of the driving screw (5) is greater than the spacing between the upper curved surface structure (603) and the lower curved surface structure (604) far from one end of the driving screw (5); the top and bottom of the cleaning scraping hole (602) respectively penetrate the upper curved surface structure (603) and the lower curved surface structure (604).

7. The bottom hole heating device for oil well exploitation according to claim 3 is characterized in that: Also includes: An annular reinforcement seat (10), wherein a plurality of annular reinforcement seats (10) are evenly fixed on the heating tube (2) and the wiring tube (7) from top to bottom; the annular reinforcement seats (10) located at the top and bottom of the heating tube (2) and the wiring tube (7) are respectively connected to the upper connecting seat (1) and the lower connecting seat (3); the driving screw (5) comprises: a plurality of screw bodies (501) connected end to end; the driving motor is connected to a screw body (501) located at the bottom; the connecting ends of two adjacent screw bodies (501) are rotatably engaged in the center hole of an annular reinforcement seat (10); and a cleaning disc (6) is threadedly connected to the screw body (501) between two adjacent annular reinforcement seats (10).

8. The bottom hole heating device for oil well exploitation according to claim 1 is characterized in that: The dry electric heater (4) is a dry electric heating rod, and the two ends of the dry electric heating rod are respectively sealed and fixedly connected to the upper connecting seat (1) and the lower connecting seat (3).

9. The bottom hole heating device for oil well exploitation according to claim 8, characterized in that: The dry electric heating rod and the heating tube (2) are coaxially arranged, and there is a gap between the dry electric heating rod and the heating tube (2).

10. The bottom hole heating device for oil well exploitation according to claim 1, characterized in that: The heating tube (2) is a titanium alloy tube.

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