Electric heater for oil extraction wellhead of oil field

Abstract

The invention relates to the technical field of oil extraction, and particularly discloses an oil field oil extraction wellhead electric heater which comprises a pipeline, a heater is arranged at one end of the pipeline, a plurality of heating pipes are installed at the end, close to the pipeline, of the heater, and the ends, away from the heater, of the heating pipes all penetrate through the pipeline. The arc surface of the pipeline is communicated with a first oil inlet pipe and a first oil outlet pipe, a stirring mechanism is arranged in the pipeline, the stirring mechanism comprises a sleeve arranged in the pipeline, the arc surface of the sleeve is communicated with a second oil inlet pipe and a second oil outlet pipe, and an impeller is arranged in the sleeve. By means of the elastic force of the first spring and clamping of the protruding block and the clamping hole, the sleeve can be stably fixed in the pipeline, later-period workers can conveniently disassemble the sleeve, oil directly flows into the sleeve to be heated, and the later-period workers can conveniently disassemble the sleeve to clean the interior of the sleeve.

Description

Technical Field

[0001] The invention belongs to the technical field of oil production, and in particular relates to an electric heater for an oilfield production wellhead. Background Art

[0002] Oilfield production refers to the process of extracting petroleum (crude oil) from underground reservoirs to the surface through a series of technical means. It is a key link in the oil industry chain. Its core goal is to efficiently and economically obtain oil resources to provide basic raw materials for energy supply and industrial production.

[0003] Crude oil usually contains components such as wax and gum, and its fluidity will decrease as the temperature drops. By heating the crude oil at the wellhead and maintaining its temperature above the freezing point, the crude oil can be ensured to remain liquid and be smoothly transported through pipelines to subsequent processing facilities.

[0004] The existing heating method is to set up multiple heating pipes inside the pipeline, then pass oil into the pipeline, and use the heat generated by the heating pipes after power is turned on to perform heat exchange, thereby achieving the purpose of increasing the temperature. Since the oil has a certain viscosity and adhesion, oil is likely to remain on the heating pipes. After the oil condenses, on the one hand, it is easy to make the surface temperature distribution of the heating pipes uneven, and local overheating is likely to occur, affecting the heating of the oil. On the other hand, the heating pipes are not easy to remove from the pipeline, making it difficult for staff to clean the heating pipes. Summary of the Invention

[0005] The object of the present invention is to provide an electric heater for an oilfield production wellhead, so as to solve the problem in the prior art that the existing heating method requires the staff to clean the heating pipe.

[0006] To achieve the above object, the present invention provides the following technical solutions: An electric heater for an oilfield production wellhead includes a pipeline, a heater is provided at one end of the pipeline, a plurality of heating tubes are installed at the end of the heater close to the pipeline, and the ends of the plurality of heating tubes away from the heater all pass through the pipeline, a first oil inlet pipe and a first oil outlet pipe are connected to the arc surface of the pipeline, and the interior of the pipeline is provided with: The stirring mechanism includes a sleeve arranged inside the pipeline, the arc surface of the sleeve is connected to the second oil inlet pipe and the second oil outlet pipe, the sleeve is provided with an impeller inside, the impeller is located below the second oil inlet pipe, one end of the impeller is mounted with a cylinder, the arc surface of the cylinder is fixedly connected to a spiral sheet, the arc surface of the sleeve is provided with a clamping hole, the sleeve is provided with a first rectangular frame inside, the first rectangular frame is slidably connected to the first slide, and the top of the first slide is fixedly connected to a protrusion that matches the clamping hole; An auxiliary mechanism includes a first drive wheel and a second drive wheel located inside the sleeve, a gear is provided on the side of the second drive wheel away from the first drive wheel, the tooth surface of the gear is engaged with a rack, a connecting rod is fixedly connected to the surface of the rack, and the end of the connecting rod away from the rack is fixedly connected to the first slide.

[0007] Preferably: the inner wall of the pipe is fixedly connected to a fixed plate, the side of the fixed plate close to the first rectangular frame is fixedly connected to a rectangular plate, the first rectangular frame is fixedly connected to the surface of the rectangular plate, the side of the first rectangular frame away from the rectangular plate is fixedly connected to a first L-shaped plate, the surface of the first L-shaped plate is rotatably connected to a rotating rod, the impeller is fixedly connected to one end of the rotating rod, and the inner wall of the sleeve is fixedly connected to a limiting plate.

[0008] Preferably, two first springs are fixedly connected to the bottom end of the first slide plate, and the bottom ends of the two first springs are fixedly connected to the inner wall of the first rectangular frame.

[0009] Preferably, a slot is formed at one end of the impeller away from the first L-shaped plate, a rubber column is engaged with the inner wall of the slot, and the end of the rubber column away from the impeller is fixedly connected to the cylinder.

[0010] Preferably: the first driving wheel is fixedly connected to the end of the rotating rod away from the impeller, the end of the second driving wheel away from the first driving wheel is fixedly connected to the second slide, the surface of the second slide is slidably connected to the second rectangular frame, the end of the second rectangular frame away from the second driving wheel is fixedly connected to a round rod, and the end of the round rod away from the second rectangular frame is rotatably connected to the fixed plate.

[0011] Preferably, one end of the second slide away from the second driving wheel is fixedly connected to a second spring, and one end of the second spring away from the second slide is fixedly connected to the inner wall of the second rectangular frame.

[0012] Preferably: the arc surface of the round rod is fixedly connected to a circular plate, the arc surface of the circular plate is fixedly connected to a first triangular block, the side wall of the fixed plate is provided with a rectangular hole, the inner wall of the rectangular hole is slidably connected to a rectangular column, the surface of the rectangular column is fixedly connected to a support rod, the end of the support rod away from the rectangular column is fixedly connected to a second triangular block, and the end face of the second triangular block is in contact with the bottom face of the first triangular block.

[0013] Preferably, the gear is fixedly connected to the arc surface of the round rod, a limiting hole is provided on the side wall of the first rectangular frame, and the connecting rod passes through the first rectangular frame via the limiting hole and is fixedly connected to the first slide plate.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention can securely hold the sleeve inside the pipe by means of the elastic force of the first spring and the engagement of the protrusion and the clamping hole, and facilitates the subsequent removal of the sleeve by the staff, so that the oil flows directly into the sleeve for heating, so that the staff can remove the sleeve and clean the inside of the sleeve.

[0015] 2. The present invention arranges an impeller and a spiral blade inside the casing, and the oil squeezes the impeller to rotate, thereby driving the spiral blade to rotate, thereby achieving the effect of conveying and stirring the oil. On the one hand, it is beneficial for the oil to be heated more evenly and improve the heating effect of the oil. On the other hand, it is beneficial for conveying the oil and prevents the oil from flowing toward the heater.

[0016] 3. The present invention can, through the mutual squeezing of the first driving wheel and the second driving wheel and the elastic force of the second spring, not affect the stability of the sleeve when the impeller is driven by the oil to rotate. When the impeller is rotated in the reverse direction, the squeezing of the first driving wheel and the second driving wheel can cause the two to rotate together, thereby driving the rack and the gear to transmit together, so that the protrusion is disengaged from the clamping hole, and the sleeve is removed from the inside of the pipeline. That is, the effect of stirring and conveying the oil is achieved by the forward rotation of the impeller, and the purpose of removing the sleeve is achieved when the impeller rotates in the reverse direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the cross-sectional plan structure of the present invention; Figure 3 It is a partial cross-sectional structural schematic diagram of the present invention; Figure 4 For the present invention Figure 1 A schematic diagram of a side plan structure; Figure 5 Schematic diagram of the split structure of the impeller and spiral blades of the present invention; Figure 6 It is a schematic diagram of a partial cross-sectional structure of the sleeve of the present invention; Figure 7 Schematic diagram of the split structure of the first rectangular frame and the first slide plate of the present invention; Figure 8 For the present invention Figure 1 Schematic diagram of a partial cross-section structure; Figure 9 It is a partial structural diagram of the stirring mechanism and auxiliary mechanism of the present invention; Figure 10 It is a partial planar structural schematic diagram of the auxiliary mechanism of the present invention.

[0018] In the figure: 1, pipeline; 101, heater; 102, heating pipe; 103, first oil inlet pipe; 104, first oil outlet pipe; 2, stirring mechanism; 201, sleeve; 202, second oil inlet pipe; 203, second oil outlet pipe; 204, fixing plate; 205, rectangular plate; 206, first rectangular frame; 207, first L-shaped plate; 2071, rotating rod; 208, impeller; 209, slot; 210, rubber column; 211, cylinder; 212, spiral sheet; 213, first spring; 21 4. First slide; 215. Bump; 216. Clamping hole; 217. Limiting plate; 3. Auxiliary mechanism; 301. First driving wheel; 302. Second driving wheel; 303. Second slide; 304. Second rectangular frame; 305. Second spring; 306. Round rod; 307. Round plate; 308. First triangular block; 309. Rectangular hole; 310. Rectangular column; 311. Support rod; 312. Second triangular block; 313. Gear; 314. Rack; 315. Connecting rod; 316. Limiting hole. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] Reference Figures 1-10 As shown, the present invention provides an electric heater for an oilfield production wellhead, comprising a pipeline 1, a heater 101 being provided at one end of the pipeline 1, a plurality of heating tubes 102 being installed at an end of the heater 101 close to the pipeline 1, and ends of the plurality of heating tubes 102 away from the heater 101 all passing through the pipeline 1, a first oil inlet pipe 103 and a first oil outlet pipe 104 being communicated with on an arc surface of the pipeline 1, a stirring mechanism 2 being provided inside the pipeline 1, the stirring mechanism 2 comprising a casing 201 disposed inside the pipeline 1, a second oil inlet pipe 202 and a second oil outlet pipe 203 being communicated with on an arc surface of the casing 201; In this embodiment, multiple heating pipes 102 are located between the pipeline 1 and the casing 201. No heating pipe 102 is set below the first oil inlet pipe 103. The inner diameter of the first oil inlet pipe 103 is smaller than the inner diameter of the second oil inlet pipe 202, and the inner diameter of the first oil outlet pipe 104 is larger than the inner diameter of the second oil outlet pipe 203, so that the oil can flow smoothly into the casing 201 and flow out of the casing 201 smoothly, so that the oil will not flow between the pipeline 1 and the casing 201.

[0021] An impeller 208 is provided inside the casing 201 and is located below the second oil inlet pipe 202. A cylinder 211 is mounted on one end of the impeller 208. A spiral blade 212 is fixedly connected to the arc surface of the cylinder 211. A retaining hole 216 is formed on the arc surface of the casing 201. A first rectangular frame 206 is provided inside the casing 201. A first slide 214 is slidably connected to the interior of the first rectangular frame 206. A protrusion 215 that cooperates with the retaining hole 216 is fixedly connected to the top of the first slide 214. In this embodiment, one side of the protrusion 215 is in an arc shape and the other side is in a straight surface shape. By squeezing the arc-shaped side of the first slide plate 214, the protrusion 215 is facilitated to slide, and the protrusion 215 is snapped into the snap hole 216 to achieve the stabilization of the sleeve 201. Under the action of the straight surface side of the protrusion 215, the sleeve 201 is not easily pulled out, thereby improving the stability of the sleeve 201 inside the pipeline 1. Through the rotation of the spiral piece 212, the effect of conveying and stirring the oil is achieved. On the one hand, it is conducive to more uniform heating of the oil and improves the heating effect of the oil. On the other hand, it is conducive to conveying the oil and prevents the oil from flowing toward the direction close to the heater 101.

[0022] In an optional embodiment: the inner wall of the pipe 1 is fixedly connected to a fixed plate 204, the side of the fixed plate 204 close to the first rectangular frame 206 is fixedly connected to a rectangular plate 205, the first rectangular frame 206 is fixedly connected to the surface of the rectangular plate 205, the side of the first rectangular frame 206 away from the rectangular plate 205 is fixedly connected to a first L-shaped plate 207, the surface of the first L-shaped plate 207 is rotatably connected to a rotating rod 2071, the impeller 208 is fixedly connected to one end of the rotating rod 2071, the inner wall of the sleeve 201 is fixedly connected to a limiting plate 217, the bottom end of the first slide plate 214 is fixedly connected to two first springs 213, and the bottom ends of the two first springs 213 are both fixedly connected to the inner wall of the first rectangular frame 206.

[0023] It should be noted that the limit plate 217 serves to limit the oil flow to the position on the impeller 208, so that the impeller 208 can only rotate in one direction under the impact of the oil.

[0024] In an optional embodiment, a slot 209 is defined at one end of the impeller 208 away from the first L-shaped plate 207 , a rubber column 210 is engaged with the inner wall of the slot 209 , and the end of the rubber column 210 away from the impeller 208 is fixedly connected to the cylinder 211 .

[0025] It should be noted that, by virtue of the engagement between the rubber column 210 and the card slot 209, the cylinder 211 and the spiral piece 212 are easily disassembled, which is beneficial for cleaning the spiral piece 212. By virtue of the friction force of the rubber column 210, the cylinder 211 can be driven to rotate when the impeller 208 rotates.

[0026] In an optional embodiment: an auxiliary mechanism 3, the auxiliary mechanism 3 includes a first drive wheel 301 and a second drive wheel 302 located inside the sleeve 201, a gear 313 is provided on the side of the second drive wheel 302 away from the first drive wheel 301, the tooth surface of the gear 313 is engaged with a rack 314, the surface of the rack 314 is fixedly connected to a connecting rod 315, and the end of the connecting rod 315 away from the rack 314 is fixedly connected to the first slide 214.

[0027] In this embodiment, both the first drive wheel 301 and the second drive wheel 302 are provided with tooth blocks, and the shape of the tooth blocks is a right triangle, that is, one side of the two sides of the tooth blocks is inclined and the other side is straight. When the tooth blocks on the first drive wheel 301 and the second drive wheel 302 are squeezed together in the inclined shape, the second drive wheel 302 is squeezed and slides. When the straight surfaces are squeezed together, the first drive wheel 301 will drive the second drive wheel 302 to rotate together.

[0028] The first driving wheel 301 is fixedly connected to the end of the rotating rod 2071 away from the impeller 208, the end of the second driving wheel 302 away from the first driving wheel 301 is fixedly connected to the second slide 303, the surface of the second slide 303 is slidably connected to the second rectangular frame 304, the end of the second rectangular frame 304 away from the second driving wheel 302 is fixedly connected to the round rod 306, the end of the round rod 306 away from the second rectangular frame 304 is rotatably connected to the fixed plate 204, the end of the second slide 303 away from the second driving wheel 302 is fixedly connected to the second spring 305, and the end of the second spring 305 away from the second slide 303 is fixedly connected to the inner wall of the second rectangular frame 304.

[0029] It should be noted that, under the elastic force of the second spring 305 , when the second driving wheel 302 slides after being squeezed by the first driving wheel 301 , it is beneficial for the second driving wheel 302 to rebound.

[0030] In an optional embodiment: the arc surface of the round rod 306 is fixedly connected to the circular plate 307, the arc surface of the circular plate 307 is fixedly connected to the first triangular block 308, the side wall of the fixed plate 204 is provided with a rectangular hole 309, the inner wall of the rectangular hole 309 is slidably connected to the rectangular column 310, the surface of the rectangular column 310 is fixedly connected to the support rod 311, the end of the support rod 311 away from the rectangular column 310 is fixedly connected to the second triangular block 312, the end face of the second triangular block 312 is fitted with the bottom face of the first triangular block 308, the gear 313 is fixedly connected to the arc surface of the round rod 306, the side wall of the first rectangular frame 206 is provided with a limiting hole 316, the connecting rod 315 passes through the first rectangular frame 206 with the help of the limiting hole 316 and is fixedly connected to the first slide plate 214.

[0031] In this embodiment, under the limitation of the first triangular block 308 and the second triangular block 312, the second driving wheel 302 can be prevented from rotating with the rotation of the first driving wheel 301. The first triangular block 308 and the second triangular block 312 are both right triangles, and the sides of the first triangular block 308 and the second triangular block 312 that contact each other are both straight surfaces, so the two are squeezed against each other and are not easy to slide.

[0032] It should be noted that the oil hits the impeller 208, causing the impeller 208 to rotate forward to achieve the effect of stirring and transporting the oil. When the impeller 208 rotates backward, it can drive the gear 313 and the rack 314 to transmit, so that the protrusion 215 is disengaged from the clamping hole 216, thereby achieving the purpose of disassembling the sleeve 201.

[0033] The working principle of the present invention is as follows: when in use, the first oil inlet pipe 103 and the first oil outlet pipe 104 are connected to the upper conduit respectively, and the heater 101 is started to heat the heating pipe 102. The heating of the heating pipe 102 will heat the casing 201, and the produced oil enters the first oil inlet pipe 103 through the conduit. Since the inner diameter of the first oil inlet pipe 103 is smaller than the inner diameter of the second oil inlet pipe 202, the oil will directly enter the casing 201 through the second oil inlet pipe 202. At this time, the oil will flow to the impeller 208, causing the impeller 208 to rotate. Under the limit of the limit plate 217, the impeller 208 will only rotate in one direction. The rotation of the impeller 208 will cause the cylinder 211 to drive the spiral piece 212 to rotate, on the one hand, to transport the oil entering the casing 201, and on the other hand, to stir the oil, which is conducive to uniform heating of the oil. When the impeller 208 rotates, it drives the first driving wheel 301 to rotate. When the first driving wheel 301 rotates, the tooth block on the first driving wheel 301 is squeezed against the tooth block on the second driving wheel 302. The tooth block on the first driving wheel 301 and the tooth block on the second driving wheel 302 are squeezed against each other at this time, and the contacting side is both inclined. The second driving wheel 302 drives the second slide plate 303 to slide along the inner wall of the second rectangular frame 304 and squeezes the second spring 305. As the impeller 208 continuously drives the first driving wheel 301 to rotate, the second spring 305 repeatedly rebounds, and under the limitation of the first triangular block 308 and the second triangular block 312, the second driving wheel 302 can be prevented from rotating with the rotation of the first driving wheel 301. Since the inner diameter of the second oil outlet pipe 203 is smaller than that of the first oil outlet pipe 104, the heated oil will flow away from the second oil outlet pipe 203. When the oil is not heated and the sleeve 201 needs to be taken out for cleaning, the flange at the end of the pipe 1 away from the heater 101 is opened, and the cylinder 211 is rotated. The rotation direction at this time is opposite to the rotation direction when the oil hits the impeller 208. At this time, when the impeller 208 rotates, the gear blocks on the first drive wheel 301 and the gear blocks on the second drive wheel 302 squeeze each other. At this time, the gear blocks on the first drive wheel 301 and the gear blocks on the second drive wheel 302 squeeze each other, and the sides of the contact are both straight, so the second drive wheel 302 will rotate with the first drive wheel 301. The first triangular block 308 rotates in the direction away from the second triangular block 312. At this time, the gear 313 rotates with the rotation of the round rod 306, and transmits the power to the rack 314. Under the connection of the connecting rod 315, the first slide 214 is driven to move downward, squeezing the first spring 213 until the protrusion 215 is out of the clamping hole 216. At this time, the staff can pull the sleeve 201 outward and pull the sleeve 201 out of the interior of the pipe 1. At this time, the cylinder 211 is pulled outward to disengage the rubber column 210 from the clamping groove 209, and the spiral piece 212 can be taken out for cleaning. At this time, the first spring 213 rebounds, causing the protrusion 215 to return to its original position. When installing the sleeve 201 into the pipe 1, the staff slides the sleeve 201 along the inside of the pipe 1, and the arc surface of the sleeve 201 slides against the arc surfaces of the multiple heating tubes 102. As the sleeve 201 slides, one end of the sleeve 201 hits the arc surface of the protrusion 215. The protrusion 215 is squeezed and drives the first slide 214 to slide downward along the inside of the first rectangular frame 206. The first spring 213 is in a compressed state until the clamping hole 216 is at the position of the protrusion 215. The first spring 213 rebounds and the protrusion 215 is pressed. 15 will be stuck into the card hole 216 to stabilize the position of the sleeve 201. At this time, the top of the sleeve 201 will be attached to the surface of the fixed plate 204. At the same time, the center of the first oil inlet pipe 103 will be aligned with the center of the second oil inlet pipe 202, and the center of the first oil outlet pipe 104 will be aligned with the center of the second oil outlet pipe 203. Then the spiral piece 212 can be placed in the sleeve 201. As the cylinder 211 moves, the rubber column 210 will be squeezed into the card groove 209. With the help of the friction force of the rubber column 210, the cylinder 211 is stabilized.

[0034] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An electric heater for an oilfield production wellhead, comprising a pipeline (1), wherein one end of the pipeline (1) is provided with a heater (101), a plurality of heating tubes (102) are installed at the end of the heater (101) close to the pipeline (1), and the ends of the plurality of heating tubes (102) away from the heater (101) all pass through the pipeline (1), and the arc surface of the pipeline (1) is connected to a first oil inlet pipe (103) and a first oil outlet pipe (104), characterized in that: The interior of the pipeline (1) is provided with: A stirring mechanism (2), the stirring mechanism (2) comprising a sleeve (201) arranged inside the pipeline (1), the arc surface of the sleeve (201) being connected to a second oil inlet pipe (202) and a second oil outlet pipe (203), an impeller (208) being provided inside the sleeve (201), the impeller (208) being located below the second oil inlet pipe (202), a cylinder (211) being mounted on one end of the impeller (208), a spiral sheet (212) being fixedly connected to the arc surface of the cylinder (211), a clamping hole (216) being provided on the arc surface of the sleeve (201), a first rectangular frame (206) being provided inside the sleeve (201), a first slide plate (214) being slidably connected to the inside of the first rectangular frame (206), a protrusion (215) matching the clamping hole (216) being fixedly connected to the top end of the first slide plate (214); An auxiliary mechanism (3) includes a first drive wheel (301) and a second drive wheel (302) located inside the sleeve (201), a gear (313) being provided on a side of the second drive wheel (302) away from the first drive wheel (301), a tooth surface of the gear (313) being meshed with a rack (314), a surface of the rack (314) being fixedly connected to a connecting rod (315), and an end of the connecting rod (315) away from the rack (314) being fixedly connected to the first slide plate (214).

2. The oilfield production wellhead electric heater according to claim 1, characterized in that: The inner wall of the pipeline (1) is fixedly connected to a fixed plate (204); a side of the fixed plate (204) close to the first rectangular frame (206) is fixedly connected to a rectangular plate (205); the first rectangular frame (206) is fixedly connected to the surface of the rectangular plate (205); a side of the first rectangular frame (206) away from the rectangular plate (205) is fixedly connected to a first L-shaped plate (207); a surface of the first L-shaped plate (207) is rotatably connected to a rotating rod (2071); the impeller (208) is fixedly connected to one end of the rotating rod (2071); and the inner wall of the sleeve (201) is fixedly connected to a limiting plate (217).

3. The oilfield production wellhead electric heater according to claim 1, characterized in that: The bottom end of the first slide plate (214) is fixedly connected to two first springs (213), and the bottom ends of the two first springs (213) are both fixedly connected to the inner wall of the first rectangular frame (206).

4. The oilfield production wellhead electric heater according to claim 2, characterized in that: A slot (209) is provided at one end of the impeller (208) away from the first L-shaped plate (207), a rubber column (210) is engaged with the inner wall of the slot (209), and the end of the rubber column (210) away from the impeller (208) is fixedly connected to the cylinder (211).

5. The oilfield production wellhead electric heater according to claim 2, characterized in that: The first driving wheel (301) is fixedly connected to an end of the rotating rod (2071) away from the impeller (208); the end of the second driving wheel (302) away from the first driving wheel (301) is fixedly connected to a second slide plate (303); the surface of the second slide plate (303) is slidably connected to a second rectangular frame (304); the end of the second rectangular frame (304) away from the second driving wheel (302) is fixedly connected to a round rod (306); the end of the round rod (306) away from the second rectangular frame (304) is rotatably connected to the fixed plate (204).

6. The oilfield production wellhead electric heater according to claim 5, characterized in that: One end of the second slide plate (303) away from the second driving wheel (302) is fixedly connected to a second spring (305), and one end of the second spring (305) away from the second slide plate (303) is fixedly connected to the inner wall of the second rectangular frame (304).

7. The oilfield production wellhead electric heater according to claim 2 or 5, characterized in that: The circular arc surface of the round rod (306) is fixedly connected to a circular plate (307), the circular arc surface of the circular plate (307) is fixedly connected to a first triangular block (308), a rectangular hole (309) is opened on the side wall of the fixed plate (204), a rectangular column (310) is slidably connected to the inner wall of the rectangular hole (309), a support rod (311) is fixedly connected to the surface of the rectangular column (310), and one end of the support rod (311) away from the rectangular column (310) is fixedly connected to a second triangular block (312), and the end surface of the second triangular block (312) is in contact with the bottom surface of the first triangular block (308).

8. The oilfield production wellhead electric heater according to claim 1, characterized in that: The gear (313) is fixedly connected to the arc surface of the round rod (306); a limiting hole (316) is provided on the side wall of the first rectangular frame (206); and the connecting rod (315) passes through the first rectangular frame (206) with the aid of the limiting hole (316) and is fixedly connected to the first slide plate (214).

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