Water injection wellhead device with anti-freezing mechanism

Abstract

The invention discloses a water injection wellhead device with an anti-freezing mechanism. The water injection wellhead device comprises a water injection wellhead body. A vertical protection cylinder is arranged on the outer side of the water injection well mouth body, transverse protection cylinders are communicated with the upper portion and the lower portion, corresponding to the water injection well mouth body, of the vertical protection cylinder, a top cover is rotationally connected to the upper end of the vertical protection cylinder, a plurality of air inlets which are evenly formed are formed in the top cover, and a plurality of air outlets which are formed in a circumferential array mode are formed in the lower end of the vertical protection cylinder. A heating wire is arranged at the upper part of the interior of the vertical pile casing; and air in the vertical pile casing and the transverse pile casing flows back to the position above the vertical pile casing again through cooperation of the first branch pipe and the second branch pipe, so that heat can be recycled, heat waste is reduced, resources can be saved, the water injection well mouth body can be comprehensively heated, the water injection well mouth body can be in a constant-temperature state, and the service life of the water injection well mouth body is prolonged. The water injection wellhead can be used at different temperatures, the water injection wellhead body is prevented from being frozen, and using convenience and adaptability are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of water injection wells, and particularly relates to a water injection wellhead device with an anti-freezing mechanism. BACKGROUND

[0002] The water injection wellhead is a key equipment device for injecting water into the underground oil layer in oilfield development, and it connects the ground water injection system and the underground oil layer. The water injection wellhead controls the injection pressure, flow rate and other parameters through the wellhead device to accurately inject the treated water into the oil layer to supplement the formation energy and maintain the oil layer pressure, thereby improving the oil recovery rate.

[0003] If the water injection wellhead is not anti-freezing, the internal residual water will freeze and expand at low temperature, which will damage the pipelines, valves and other facilities, cause the interruption of water injection, affect the energy supplement of the oil layer and the normal production of crude oil, and may also cause safety hazards and increase the maintenance cost.

[0004] In cold regions, the internal medium of the water injection wellhead is prone to freeze due to low temperature, which affects the normal water injection operation. Among the commonly used anti-freezing methods, wrapping an outer protective sleeve outside the water injection wellhead is a simple and effective method and is widely used. The outer protective sleeve is usually made of materials with low thermal conductivity and good heat preservation performance. These materials can effectively block the direct contact of external cold air with the wellhead and reduce heat loss. However, in actual use, the method of wrapping an outer protective sleeve is only effective within the range of 0℃ to 15℃. When the environmental temperature is lower than the freezing point of water, the outer protective sleeve cannot effectively insulate the water injection wellhead, and the water injection wellhead still has the risk of freezing.

[0005] The patent application with the patent publication number CN213627542U discloses a water injection wellhead device with an anti-freezing mechanism, which keeps the water in the first box flowing to achieve the anti-freezing purpose of the water injection inlet, avoids the freezing of the water injection inlet due to excessively low temperature, causes damage to the parts, reduces the cost of production, and improves the work efficiency. Although the above-mentioned device can achieve a certain anti-freezing purpose, in actual use, when the environmental temperature is lower than the freezing point of water, even if the water is flowing, it will gradually freeze. The water flow only slows down the freezing process and cannot prevent the freezing of water. SUMMARY

[0006] The purpose of the present application is to solve the problem of freezing of the water injection wellhead in the prior art, and to provide a water injection wellhead device with an anti-freezing mechanism.

[0007] The purpose of the present application can be achieved by the following technical solutions: The utility model provides an injection well head device with anti-freezing mechanism, including injection well head body, the outside of injection well head body is provided with vertical casing, and the upper and lower of vertical casing are communicated with horizontal casing, the upper end of vertical casing is rotatably connected with top cover, a plurality of evenly arranged air inlets are arranged on the top cover, a plurality of circumferential arrayed air outlets are arranged on the lower end of vertical casing, the inside of vertical casing is provided with heating wire, the lower of the inside of vertical casing is connected with second support plate, the lower surface of second support plate is connected with motor, and the output end of motor penetrates second support plate and is connected with air suction fan, the middle part of vertical casing is sequentially connected with first table type groove block, annular block and second table type groove block from top to bottom, the both ends of horizontal casing located below are communicated with the first branch pipe arranged symmetrically between the upper end of vertical casing, and the both ends of horizontal casing located above are communicated with the second branch pipe at the position corresponding to first branch pipe.

[0008] Preferably, the first table type groove block is inverted trapezoidal in cross section, the first table type groove block collects air and guides the air into the annular block, narrows the flow area of the air, and thus increases the flow rate of the air.

[0009] Preferably, the vertical casing guides the air into the horizontal casing through the cooperation of the first guide plates, the horizontal casing makes the air fully stay in the horizontal casing through the helical blades, the upper ends of the horizontal casings are connected with the first guide plates arranged symmetrically at the positions corresponding to the vertical casing, the first guide plates are connected with the vertical casing, and the helical blades are connected with the horizontal casings at the positions corresponding to the first guide plates.

[0010] Preferably, the air suction fan draws the air into the vertical casing through the air inlets, heats the drawn air through the cooperation of the heating wire, the heated air flows to the positions of the upper horizontal casings, divides the flow area into two parts under the cooperation of the first guide plates, a part of the air enters the upper horizontal casings, and the other part of the air continues to flow downward, the air entering the upper horizontal casings fully stays in the upper horizontal casings under the guidance of the helical blades.

[0011] Preferably, the air continuing to flow downward enters the middle part of the vertical casing, the flow rate of the air increases and the air continues to flow downward under the cooperation of the first table type groove block, the annular block and the second table type groove block, the flow area is divided into two parts under the cooperation of the first guide plates, a part of the air enters the lower horizontal casings, and the other part of the air continues to flow downward, the air entering the lower horizontal casings fully stays in the lower horizontal casings under the guidance of the helical blades, and the air in the vertical casing and the horizontal casings flows back to the upper part of the vertical casing again through the cooperation of the first branch pipe and the second branch pipe.

[0012] Preferably, the filter plate is positioned by the lap joint groove, and is fixed by the pressing block, a plurality of lap joint grooves are arranged uniformly on the top cover corresponding to the air inlet, the filter plate is arranged in the lap joint groove, and the pressing block is arranged on the top cover corresponding to the filter plate.

[0013] Preferably, the upper surface of the pressing block is connected with a rotating rod away from one end of the filter plate, the upper surface of the pressing block is connected with an L-shaped first supporting block corresponding to the rotating rod, and a torsion spring is connected between the pressing block and the first supporting block.

[0014] Preferably, the heating wire is arranged in the fixing groove of the first supporting plate through the fixing block, the middle of the heating wire is connected with the fixing block, the first supporting plate is connected with the fixing block in the vertical protection tube, and the fixing groove is arranged in the middle of the first supporting plate corresponding to the fixing block.

[0015] Preferably, the fixing block is fixed in the fixing groove of the first supporting plate through the first inserting rod, the pull plate is matched with the first inserting rod and the second inserting rod, the fixing of the fixing block and the top cover is realized, the first inserting rod is slidably connected to the vertical protection tube corresponding to the fixing block, and the second inserting rod is connected to one side of the pull plate close to the fixing plate.

[0016] Preferably, the second supporting block is arranged on the outer side of the vertical protection tube corresponding to the first inserting rod, the first spring is connected between the second supporting block and the pull plate.

[0017] The beneficial effects of the present application are as follows: 1) By starting the heating wire and the motor, the heating wire will heat the air after starting, and the motor will drive the air suction fan to rotate after starting. The air suction fan draws air into the vertical casing through the air inlet, and then heats the drawn air through the cooperation of the heating wire. The heated air flows to the position of the upper horizontal casing. Under the cooperation of the first guide plate, the flow area is divided into two parts. Part of the air enters the upper horizontal casing, and the other part of the air continues to flow downward. The air in the upper horizontal casing is fully guided by the spiral blade, so that the upper water injection well mouth body can be fully heated. The air continues to flow downward and enters the middle part of the vertical casing. Under the cooperation of the first table-shaped groove block, the annular block and the second table-shaped groove block, the flow area of the air is narrowed, so that the air flow rate is increased, ensuring that the air can continue to descend. The air continues to descend and flows to the position of the lower horizontal casing. Under the cooperation of the first guide plate, the flow area is divided into two parts. Part of the air enters the lower horizontal casing, and the other part of the air continues to flow downward. The air in the lower horizontal casing is fully guided by the spiral blade, so that the lower water injection well mouth body can be fully heated. The air in the vertical casing and the horizontal casing flows back to the upper part of the vertical casing again through the cooperation of the first branch pipe and the second branch pipe, so that the heat can be reused, reducing the waste of heat, saving resources, fully heating the water injection well mouth body, and keeping the water injection well mouth body in a constant temperature state. It can be used at different temperatures to prevent the water injection well mouth body from freezing, improving the convenience and adaptability of use.

[0018] 2) When the filter plate needs to be replaced, the pressing block is rotated. The pressing block will tighten the torsional spring when it is rotated. The torsional spring will store restoring force after being tightened. The pressing block moves away from the filter plate after being rotated, so that the filter plate loses the blockage. Thus, the filter plate can be taken out of the lap joint groove, and a new filter plate can be replaced. After the new filter plate is placed in the lap joint groove, the pressing block is slowly loosened. Under the action of the restoring force of the torsional spring, the pressing block will be reset. The reset pressing block is above the filter plate again, so that the filter plate can be pressed tightly to prevent the filter plate from falling out of the lap joint groove. It is more convenient to replace the filter plate, which can improve the work efficiency.

[0019] 3) when the heating wire needs to be replaced, the pull plate is pulled away from the vertical sleeve, the pull plate moves and presses the first spring, the first spring is contracted and stores the restoring force, the pull plate moves away from the vertical sleeve and drives the first inserting rod to move out of the first inserting slot, and synchronously drives the second inserting rod to move out of the second inserting slot, so that the top cover and the fixing block lose fixation at the same time, the top cover is opened by rotating, the heating wire is taken out, the new heating wire is put into the vertical sleeve, the fixing block is inserted into the fixing slot, the top cover is closed by rotating, the pull plate is slowly released, the pull plate is reset under the action of the restoring force of the spring, after the pull plate is reset, the first inserting rod is inserted into the first inserting slot, the second inserting rod is inserted into the second inserting slot, so that the top cover and the heating wire can be fixed at the same time, the synchronism is improved, and the work efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] The application will be further described below in combination with the drawings.

[0021] Figure 1 is a sectional view of the application; Figure 2 is a perspective view of the application; Figure 3 is Figure 2 is an enlarged view of A in the figure; Figure 4 is Figure 2 is an enlarged view of B in the figure; Figure 5 is an exploded view of the first support plate in the application.

[0022] In the figure: 1, water injection well head body; 2, vertical sleeve; 3, first branch pipe; 4, gas outlet; 21, top cover; 22, air inlet; 221, lap joint groove; 222, filter plate; 223, pressing block; 224, rotating rod; 225, first support block; 226, limiting groove; 227, torsional spring; 23, heating wire; 231, fixing block; 232, first support plate; 233, fixing slot; 234, first inserting rod; 235, first inserting slot; 236, pull plate; 237, fixing plate; 238, second inserting rod; 239, second inserting slot; 2310, second support block; 2311, sliding groove; 2312, first spring; 24, second support plate; 241, motor; 242, air suction fan; 25, first table-shaped groove block; 251, annular block; 252, second table-shaped groove block; 26, horizontal sleeve; 261, first guide plate; 262, spiral blade; 31, second branch pipe; 32, second guide plate. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0024] Please refer to Figure 1 , Figure 2 , Figure 4 and Figure 5 , a water injection wellhead device with anti-freezing mechanism, comprising a water injection wellhead body 1, a vertical casing 2 is arranged outside the water injection wellhead body 1, the vertical casing 2 is communicated with the horizontal casing 26 above and below the water injection wellhead body 1, the water injection wellhead body 1 is located in the vertical casing 2 and the horizontal casing 26, the vertical casing 2 and the horizontal casing 26 are used to protect the water injection wellhead body 1, and the heated air can be concentrated in the vertical casing 2 and the horizontal casing 26, so that the heated air can heat the water injection wellhead body 1, achieving the purpose of preventing the water injection wellhead body 1 from freezing.

[0025] The valves of the water injection wellhead body 1 all penetrate the vertical casing 2 and the horizontal casing 26, and this arrangement avoids affecting the normal use of the water injection wellhead body 1.

[0026] The upper end of the vertical casing 2 is rotationally connected with a top cover 21, the heating wire 23 can be replaced by opening the top cover 21, and the sealing of the vertical casing 2 and the horizontal casing 26 can be ensured by closing the top cover 21.

[0027] A plurality of uniformly arranged air inlets 22 are formed in the top cover 21, and the air can be drawn into the vertical casing 2 by the air suction fan 242 through the air inlets 22.

[0028] The filter plate 222 is determined to be installed in position by the lap joint groove 221, and is tightly fixed by the pressing block 223.

[0029] A plurality of uniformly arranged lap joint grooves 221 are formed in the top cover 21 above the positions corresponding to the air inlets 22, and the lap joint grooves 221 are used to place the filter plate 222.

[0030] The filter plate 222 is arranged in the lap joint groove 221, and is used to filter impurities in the air to prevent the impurities from entering the vertical casing 2 and the horizontal casing 26.

[0031] The pressing block 223 is arranged at the position corresponding to the filter plate 222 above the top cover 21, the pressing block 223 is tightly attached to the filter plate 222, the pressing block 223 is used to tightly press the filter plate 222 to prevent the filter plate 222 from falling off from the lap joint groove 221.

[0032] The upper surface of the pressing block 223 away from one end of the filter plate 222 is connected with a rotating rod 224, which is used to determine the position of the pressing block 223 and the rotating center of the pressing block 223.

[0033] The upper surface of the pressing block 223 corresponding to the position of the rotating rod 224 is connected with an L-shaped first supporting block 225, and the first supporting block 225 is away from the filter plate 222. The first supporting block 225 is provided with a limiting groove 226 corresponding to the position of the rotating rod 224, and the rotating rod 224 is rotatably connected in the limiting groove 226. Through the cooperation of the first supporting block 225 and the limiting groove 226, the position of the rotating rod 224 and the pressing block 223 can be limited.

[0034] A torsional spring 227 is connected between the pressing block 223 and the first supporting block 225, and the torsional spring 227 is located outside the rotating rod 224. The torsional spring 227 is used to reset the pressing block 223.

[0035] A plurality of circumferentially arrayed air outlets 4 are formed in the lower end of the vertical casing 2, which are used to discharge air to avoid excessive internal pressure of the vertical casing 2 and the horizontal casing 26.

[0036] In specific use, when the filter plate 222 needs to be replaced, the pressing block 223 is rotated. When the pressing block 223 rotates, the torsional spring 227 is tightened. After the torsional spring 227 is tightened, it stores a restoring force. After the pressing block 223 rotates away from the filter plate 222, the filter plate 222 loses the blockage, so that the filter plate 222 can be taken out of the lap joint groove 221, and a new filter plate 222 is replaced. After the new filter plate 222 is placed in the lap joint groove 221, the pressing block 223 is slowly loosened. Under the action of the restoring force of the torsional spring 227, the pressing block 223 is reset. The reset pressing block 223 is again above the filter plate 222, so that the filter plate 222 can be pressed tightly to avoid the filter plate 222 from falling off the lap joint groove 221. When the filter plate 222 is replaced, it is more convenient and can improve work efficiency.

[0037] Please refer to Figure 1 , Figure 3 and Figure 5 , a heating wire 23 is arranged inside the vertical casing 2.

[0038] The heating wire 23 is installed in the fixing groove 233 of the first supporting plate 232 through the fixing block 231.

[0039] The middle part of the heating wire 23 is connected with the fixing block 231, which is used to fix and support the heating wire 23.

[0040] A first supporting plate 232 is connected below the fixing block 231 inside the vertical casing 2, which is used to support the fixing block 231.

[0041] The first support plate 232 is provided with a fixing groove 233 corresponding to the position of the fixing block 231, and the fixing block 231 is inserted into the fixing groove 233, so that the position of the heating wire 23 can be limited through cooperation of the fixing block 231 and the fixing groove 233.

[0042] The fixing block 231 is fixed in the fixing groove 233 of the first support plate 232 through a first insertion rod 234, and a pull plate 236 cooperates with the first insertion rod 234 and a second insertion rod 238 to fix the fixing block 231 and the top cover 21.

[0043] The first insertion rod 234 is slidably connected to the position of the fixing block 231 above the vertical casing 2, and the fixing block 231 is provided with a first insertion groove 235 corresponding to the position of the first insertion rod 234 of the first support plate 232, the first insertion rod 234 is inserted into the first insertion groove 235, and the fixing block 231 and the heating wire 23 can be fixed through cooperation of the first insertion rod 234 and the first insertion groove 235 to prevent the fixing block 231 from falling out of the fixing groove 233.

[0044] The first insertion rod 234 is connected to the outer side of the end away from the fixing block 231, and the pull plate 236 is used to move the first insertion rod 234 out of the first insertion groove 235, and simultaneously move the second insertion rod 238 out of the second insertion groove 239.

[0045] The top cover 21 is connected to the position close to the pull plate 236, and the fixing plate 237 is used to assist in fixing the top cover 21.

[0046] The second insertion rod 238 is connected to the upper end of the pull plate 236 close to one side of the fixing plate 237, the fixing plate 237 is provided with a second insertion groove 239 corresponding to the position of the second insertion rod 238, the second insertion rod 238 is inserted into the second insertion groove 239, and the top cover 21 can be fixed through cooperation of the second insertion rod 238 and the second insertion groove 239.

[0047] The vertical casing 2 is connected to the position corresponding to the first insertion rod 234 on the outer side, and the second support block 2310 is L-shaped, the second support block 2310 is provided with a sliding groove 2311 corresponding to the position of the first insertion rod 234, the first insertion rod 234 is slidably connected to the sliding groove 2311, and the first support block 225 cooperates with the sliding groove 2311 to limit the position of the first insertion rod 234.

[0048] The first spring 2312 is connected between the second support block 2310 and the pull plate 236, and the first spring 2312 is located on the outer side of the first insertion rod 234, and the first spring 2312 is used to reset the first insertion rod 234.

[0049] In specific use, when the heating wire 23 needs to be replaced, the pull plate 236 is pulled to move away from the vertical sleeve, and the first spring 2312 is pressed when the pull plate 236 moves, and the first spring 2312 is contracted and stores the restoring force. When the pull plate 236 moves away from the vertical sleeve, the first insertion rod 234 is moved out of the first insertion slot 235, and the second insertion rod 238 is moved out of the second insertion slot 239 at the same time, so that the top cover 21 and the fixing block 231 are simultaneously fixed. By rotating the top cover 21, the heating wire 23 can be taken out, the new heating wire 23 is placed in the vertical sleeve 2, and the fixing block 231 is inserted into the fixing groove 233, and then the top cover 21 is closed, and the pull plate 236 is slowly loosened. Under the action of the restoring force of the spring, the pull plate 236 can be reset. After the pull plate 236 is reset, the first insertion rod 234 is inserted into the first insertion slot 235, and the second insertion rod 238 is inserted into the second insertion slot 239, so that the top cover 21 and the heating wire 23 can be fixed at the same time, the synchronism is improved, and the work efficiency is improved.

[0050] It is worth noting here that the water injection well head body 1 may be expanded, broken or blocked due to icing in a low temperature environment, affecting the normal operation of water injection, so that the heating wire 23 is matched to achieve the purpose of anti-freezing; The water injection well head body 1 may be deformed, aged or damaged due to thermal stress in a high temperature environment, affecting the service life and water injection efficiency of the equipment, so that high temperature resistance is needed. The heating wire 23 is replaced by a condenser tube in a high temperature environment, which can achieve the purpose of high temperature resistance and can be more comprehensive in use.

[0051] Please refer to Figure 1 As shown in the figure, the second support plate 24 is connected below the heating wire 23 inside the vertical sleeve 2, and the second support plate 24 is used to support and fix the motor 241.

[0052] The motor 241 is connected to the lower surface of the second support plate 24, the output end of the motor 241 penetrates through the second support plate 24 and is connected with the exhaust fan 242, and the motor 241 is used to drive the exhaust fan 242 to rotate.

[0053] The first table-shaped groove block 25, the annular block 251 and the second table-shaped groove block 252 are connected in turn from top to bottom in the middle of the vertical sleeve 2. The first table-shaped groove block 25 is inverted in cross section, which can gather air and guide the air into the annular block 251, so as to narrow the flow area of the air and increase the flow rate of the air.

[0054] The second type of groove block 252 is a trapezoidal profile, the inner diameter of the lower end of the first type of groove block 25 is the same as the inner diameter of the annular block 251, and the inner diameter of the upper end of the second type of groove block 252 is the same as the inner diameter of the annular block 251. Through this setting mode, when the heated air enters the middle part of the vertical casing 2, the flow area of the air can be narrowed, and the air is forced to pass through the narrow place at a higher speed to maintain constant flow. The increase in flow rate will cause a local pressure drop, thereby forming a pressure difference to push the air to accelerate, ensuring that the heated air can enter the lower horizontal casing 26, so that the water injection wellhead body 1 can be fully heated.

[0055] The vertical casing 2 guides the air into the horizontal casing 26 through the cooperation of the first guide plate 261, and the horizontal casing 26 makes the air fully in the horizontal casing 26 through the spiral blade 262.

[0056] The horizontal casing 26 is connected with the first guide plate 261 arranged symmetrically at the position corresponding to the vertical casing 2, and the first guide plate 261 is connected with the vertical casing 2. The first guide plate 261 is used for guiding the heated air into the horizontal casing 26.

[0057] The horizontal casing 26 is connected with the spiral blade 262 at the position corresponding to the first guide plate 261, and the spiral blade 262 is used for guiding the heated air to make the heated air fully in the horizontal casing 26, avoiding that the air of the heating port is only above the inside of the horizontal casing 26.

[0058] The first branch pipe 3 arranged symmetrically is communicated between the two ends of the lower horizontal casing 26 and the upper end of the vertical casing 2, and the second branch pipe 31 is communicated at the position corresponding to the first branch pipe 3 of the upper horizontal casing 26. Through the cooperation of the first branch pipe 3 and the second branch pipe 31, the heated air in the vertical casing 2 and the horizontal casing 26 can be guided to the upper end of the vertical casing 2, thereby reducing heat waste.

[0059] The second guide plate 32 is connected at the position corresponding to the second branch pipe 31 in the first branch pipe 3, and the second guide plate 32 is used for separating two flow areas to avoid the air in the first branch pipe 3 flowing into the second branch pipe 31.

[0060] In specific use, by starting the heating wire 23 and the motor 241, the heating wire 23 heats the air after starting, the motor 241 drives the air suction fan 242 to rotate after starting, the air suction fan 242 sucks the air into the vertical cylinder 2 through the air inlet 22, and then heats the sucked air through the cooperation of the heating wire 23. The heated air flows to the position of the upper horizontal cylinder 26, and under the cooperation of the first guide plate 261, the flow area is divided into two parts, one part of the air enters the upper horizontal cylinder 26, and the other part of the air continues to flow downward. The air in the upper horizontal cylinder 26 is guided by the spiral blade 262 to be fully in the upper horizontal cylinder 26, so that the upper water injection well mouth body 1 can be fully heated, and the air continues to flow downward and enters the middle part of the vertical cylinder 2. Under the cooperation of the first table-shaped groove block 25, the annular block 251 and the second table-shaped groove block 252, the flow area of the air is narrowed, so that the flow rate of the air is increased, and the air can continue to descend. The air continues to descend and flows to the position of the lower horizontal cylinder 26, and under the cooperation of the first guide plate 261, the flow area is divided into two parts, one part of the air enters the lower horizontal cylinder 26, and the other part of the air continues to flow downward. The air in the lower horizontal cylinder 26 is guided by the spiral blade 262 to be fully in the lower horizontal cylinder 26, so that the lower water injection well mouth body 1 can be fully heated. The air in the vertical cylinder 2 and the horizontal cylinder 26 flows back to the upper part of the vertical cylinder 2 again through the cooperation of the first branch pipe 3 and the second branch pipe 31, so that the heat can be reused, the waste of heat can be reduced, the resources can be saved, the water injection well mouth body 1 can be fully heated, and the water injection well mouth body 1 can be in a constant temperature state. It can be used at different temperatures to prevent the water injection well mouth body 1 from freezing, and the convenience and adaptability of use are improved.

[0061] It should be noted that in this document, such as the term "comprise", "include" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or equipment.

[0062] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the present application.

Claims

1. A water injection wellhead device with an anti-freezing mechanism, comprising a water injection wellhead body (1); characterized in that: A vertical casing (2) is provided on the outside of the water injection wellhead body (1). A horizontal casing (26) is connected to both the top and bottom of the vertical casing (2). A top cover (21) is rotatably connected to the upper end of the vertical casing (2). Multiple air inlets (22) are evenly arranged on the top cover (21). Multiple air outlets (4) are arranged in a circular array at the lower end of the vertical casing (2). A heating wire (23) is provided at the top inside the vertical protective tube (2). A second support plate (24) is connected to the bottom of the heating wire (23) inside the vertical protective tube (2). A motor (241) is connected to the lower surface of the second support plate (24). The output end of the motor (241) passes through the second support plate (24) and is connected to the exhaust fan (242). The vertical casing (2) is connected from top to bottom to the first platform-shaped groove block (25), the annular block (251) and the second platform-shaped groove block (252). The two ends of the lower horizontal protective sleeve (26) are connected to the upper end of the vertical protective sleeve (2) by symmetrically arranged first branch pipes (3), and the two ends of the upper horizontal protective sleeve (26) are connected to the positions of the first branch pipes (3) by second branch pipes (31). The exhaust fan (242) draws air into the vertical casing (2) through the air inlet (22). With the help of the heating wire (23), the drawn air is heated. The heated air flows to the position of the upper horizontal casing (26). With the help of the first guide plate (261), the flow area is divided into two parts. One part of the air enters the upper horizontal casing (26), and the other part of the air continues to flow downward. The air entering the upper horizontal casing (26) is fully contained in the upper horizontal casing (26) under the guidance of the spiral blades (262).

2. A water injection wellhead device with an anti-freezing mechanism according to claim 1, characterized in that: The first platform-shaped groove block (25) has an inverted platform shape in cross section. The first platform-shaped groove block (25) gathers air and guides the air into the annular block (251), making the air flow area narrower and thus making the air flow speed faster.

3. A water injection wellhead device with an anti-freezing mechanism according to claim 2, characterized in that: The vertical sleeve (2) introduces air into the horizontal sleeve (26) through the cooperation of the first guide plate (261). The horizontal sleeve (26) ensures that the air is fully inside the horizontal sleeve (26) through the spiral blades (262). The first guide plates (261) are symmetrically arranged above the horizontal sleeve (26) corresponding to the position of the vertical sleeve (2), and the first guide plates (261) are connected to the vertical sleeve (2). The spiral blades (262) are connected inside the horizontal sleeve (26) corresponding to the position of the first guide plate (261).

4. A water injection wellhead device with an anti-freezing mechanism according to claim 3, characterized in that: The air flowing downwards enters the middle of the vertical casing (2). With the cooperation of the first platform-shaped groove block (25), the annular block (251) and the second platform-shaped groove block (252), the air velocity increases and continues to descend. The air flows downwards to the position of the lower horizontal casing (26). With the cooperation of the first guide plate (261), the flow area is divided into two parts. One part of the air enters the lower horizontal casing (26), and the other part of the air continues to flow downwards. The air entering the lower horizontal casing (26) is fully contained in the lower horizontal casing (26) under the guidance of the spiral blades (262). The air in the vertical casing (2) and the horizontal casing (26) flows back to the top of the vertical casing (2) through the cooperation of the first branch pipe (3) and the second branch pipe (31).

5. A water injection wellhead device with an anti-freezing mechanism according to claim 4, characterized in that: The filter plate (222) is installed in a position determined by the overlapping groove (221) and is pressed and fixed by the pressure block (223). Multiple overlapping grooves (221) are evenly arranged on the top cover (21) corresponding to the air inlet (22). The filter plate (222) is installed in the overlapping groove (221). Pressure blocks (223) are installed on the top cover (21) corresponding to the position of the filter plate (222).

6. A water injection wellhead device with an anti-freezing mechanism according to claim 5, characterized in that: A rotating rod (224) is connected to the upper surface of the pressure block (223) away from the filter plate (222). An L-shaped first support block (225) is connected to the upper surface of the pressure block (223) at the position corresponding to the rotating rod (224). A torsion spring (227) is connected between the pressure block (223) and the first support block (225).

7. A water injection wellhead device with an anti-freezing mechanism according to claim 6, characterized in that: The heating wire (23) is installed in the fixing groove (233) of the first support plate (232) by the fixing block (231). The fixing block (231) is connected in the middle of the heating wire (23). The first support plate (232) is connected in the vertical sleeve (2) below the fixing block (231). The fixing groove (233) is opened in the middle of the first support plate (232) at the position corresponding to the fixing block (231).

8. A water injection wellhead device with an anti-freezing mechanism according to claim 7, characterized in that: The fixing block (231) is fixed in the fixing groove (233) of the first support plate (232) by the first insert rod (234). The pull plate (236) cooperates with the first insert rod (234) and the second insert rod (238) to fix the fixing block (231) and the top cover (21). The first insert rod (234) is slidably connected above the vertical sleeve (2) at the position corresponding to the fixing block (231). The second insert rod (238) is connected to the side of the pull plate (236) near the fixing plate (237).

9. A water injection wellhead device with an anti-freezing mechanism according to claim 8, characterized in that: The vertical sleeve (2) is connected to an L-shaped second support block (2310) at the position corresponding to the first insert (234) on the outside. A first spring (2312) is connected between the second support block (2310) and the pull plate (236).

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