A water injection wellhead device with anti-freezing mechanism

Abstract

The application discloses a water injection well head device with an anti-freezing mechanism, which comprises a water injection well head body; a vertical casing is arranged outside the water injection well head body; a horizontal casing is communicated with the upper and lower parts of the water injection well head body; a top cover is rotatably connected to the upper end of the vertical casing; a plurality of air inlets are arranged on the top cover; a plurality of air outlets are arranged in a circumferential array at the lower end of the vertical casing; heating wires are arranged inside the upper part of the vertical casing; and air in the vertical casing and the horizontal casing is circulated to the upper part of the vertical casing through the cooperation of a first branch pipe and a second branch pipe, so that the heat can be reused, the waste of heat is reduced, resources can be saved, the water injection well head body can be heated comprehensively, the water injection well head body can be kept in a constant temperature state, the water injection well head body can be used at different temperatures, the freezing of the water injection well head body is prevented, and the convenience and adaptability of use 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:

[0008] 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.

[0009] 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.

[0010] 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.

[0011] 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.

[0012] Preferably, the air continuing to flow downward enters the middle part of the vertical casing, the air flow rate increases and continues to decrease under the cooperation of the first table type groove block, the annular block and the second table type groove block, the air flow direction is the positions of the lower horizontal casings, divides the flow area 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 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.

[0013] 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.

[0014] 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.

[0015] 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 inside of the vertical protection cylinder is connected with the first supporting plate corresponding to the lower side of the fixing block, and the middle of the first supporting plate is arranged with the fixing groove corresponding to the position of the fixing block.

[0016] 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 upper side of the vertical protection cylinder is connected with the first inserting rod corresponding to the position of the fixing block in a sliding mode, and the second inserting rod is connected with the pull plate on the side close to the fixing plate.

[0017] Preferably, the outer side of the vertical protection cylinder is connected with an L-shaped second supporting block corresponding to the position of the first inserting rod, and the first spring is connected between the second supporting block and the pull plate.

[0018] The beneficial effects of the present application are as follows:

[0019] 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.

[0020] 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 again above the filter plate, so that the filter plate can be tightly pressed to prevent the filter plate from falling out of the lap joint groove. It is relatively convenient to replace the filter plate, which can improve the work efficiency.

[0021] 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 pressed and shrinks to store 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, then 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

[0022] The application will be further described below with reference to the drawings.

[0023] Figure 1 is a sectional view of the application;

[0024] Figure 2 is a perspective view of the application;

[0025] Figure 3 is Figure 2 is an enlarged view of A in the figure;

[0026] Figure 4 is Figure 2 is an enlarged view of B in the figure;

[0027] Figure 5 is an exploded view of the first support plate in the application.

[0028] In the figure: 1, water injection well head body; 2, vertical sleeve; 3, first branch pipe; 4, gas outlet;

[0029] 21, top cover;

[0030] 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;

[0031] 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;

[0032] 24, second support plate; 241, motor; 242, exhaust fan;

[0033] 25, first table-shaped groove block; 251, ring-shaped block; 252, second table-shaped groove block;

[0034] 26, transverse casing; 261, first guide plate; 262, helical blade;

[0035] 31, second branch pipe; 32, second guide plate. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with 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 in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0037] 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 transverse 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 transverse casing 26, the vertical casing 2 and the transverse casing 26 are used for protecting the water injection wellhead body 1, and the heated air can be concentrated in the vertical casing 2 and the transverse 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.

[0038] The valves of the water injection wellhead body 1 all penetrate the vertical casing 2 and the transverse casing 26, and through this arrangement, the normal use of the water injection wellhead body 1 is avoided.

[0039] A top cover 21 is rotatably connected to the upper end of the vertical casing 2, the heating wire 23 can be replaced by opening the top cover 21, and the sealing of the vertical casing 2 and the transverse casing 26 can be ensured by closing the top cover 21.

[0040] 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.

[0041] The filter plate 222 is determined to be installed at a position by the lap joint groove 221, and is tightly fixed by the pressing block 223.

[0042] 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 for placing the filter plate 222.

[0043] The lap joint groove 221 is provided with a filter plate 222. The filter plate 222 is used for filtering impurities in the air, so as to avoid the impurities entering the vertical casing 2 and the horizontal casing 26.

[0044] The top cover 21 is provided with a pressing block 223 above the position corresponding to the filter plate 222. The pressing block 223 is tightly attached to the filter plate 222. The pressing block 223 is used for pressing the filter plate 222, so as to prevent the filter plate 222 from falling out of the lap joint groove 221.

[0045] The upper surface of the end of the pressing block 223 away from the filter plate 222 is connected with a rotating rod 224. The rotating rod 224 is used for determining the position of the pressing block 223 and the rotating center of the pressing block 223.

[0046] The upper surface of the pressing block 223 is connected with an L-shaped first supporting block 225 corresponding to the position of the rotating rod 224. 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. 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.

[0047] A torsional spring 227 is connected between the pressing block 223 and the first supporting block 225. The torsional spring 227 is located outside the rotating rod 224. The torsional spring 227 is used for resetting the pressing block 223.

[0048] The vertical casing 2 is provided with a plurality of air outlets 4 arranged in a circular array at the lower end. The air outlets 4 are used for discharging air, so as to avoid the internal pressure of the vertical casing 2 and the horizontal casing 26 being too large.

[0049] In specific use, when the filter plate 222 needs to be replaced, the pressing block 223 is rotated. When the pressing block 223 is rotated, the torsional spring 227 is tightened. After the torsional spring 227 is tightened, the restoring force is stored. After the pressing block 223 is rotated, the pressing block 223 is away from the filter plate 222, so that the filter plate 222 is no longer blocked. Therefore, 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, and the filter plate 222 is prevented from falling out of the lap joint groove 221. When the filter plate 222 is replaced, it is more convenient, and the work efficiency can be improved.

[0050] Please refer to Figure 1 , Figure 3 and Figure 5 , the inside of the vertical casing 2 is provided with a heating wire 23. The heating wire 23 is used for heating air.

[0051] The heating wire 23 is installed in the fixing groove 233 of the first support plate 232 through the fixing block 231.

[0052] The fixing block 231 is connected in the middle of the heating wire 23, and is used for fixing the support of the heating wire 23.

[0053] The first support plate 232 is connected below the inside of the vertical casing 2 corresponding to the fixing block 231, and is used for supporting the fixing block 231.

[0054] The fixing groove 233 is arranged in the middle of the first support plate 232 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 the cooperation of the fixing block 231 and the fixing groove 233.

[0055] The fixing block 231 is fixed in the fixing groove 233 of the first support plate 232 through the first inserting rod 234, and the pull plate 236 cooperates with the first inserting rod 234 and the second inserting rod 238 to realize the fixation of the fixing block 231 and the top cover 21.

[0056] The first inserting rod 234 is slidingly connected to the position of the fixing block 231 above the vertical casing 2, and the first inserting rod 234 is inserted into the first inserting groove 235 corresponding to the position of the first inserting rod 234 of the fixing block 231 and the first support plate 232, so that the fixing block 231 and the heating wire 23 can be fixed through the cooperation of the first inserting rod 234 and the first inserting groove 235, and the fixing block 231 is prevented from falling out of the fixing groove 233.

[0057] The pull plate 236 is connected to the outer side of the end of the first inserting rod 234 away from the fixing block 231, and is used for moving the first inserting rod 234 out of the first inserting groove 235, and simultaneously moving the second inserting rod 238 out of the second inserting groove 239.

[0058] The fixing plate 237 is connected to the position of the top cover 21 close to the pull plate 236, and is used for assisting in fixing the top cover 21.

[0059] The second inserting rod 238 is connected to the upper end of the pull plate 236 close to one side of the fixing plate 237, and the second inserting groove 239 is arranged in the position of the fixing plate 237 corresponding to the second inserting rod 238, and the second inserting rod 238 is inserted into the second inserting groove 239, so that the top cover 21 can be fixed through the cooperation of the second inserting rod 238 and the second inserting groove 239.

[0060] The outer side of the vertical casing 2 is connected with an L-shaped second supporting block 2310 corresponding to the position of the first inserting rod 234, the second supporting block 2310 is provided with a sliding groove 2311 corresponding to the position of the first inserting rod 234, the first inserting rod 234 is slidingly connected in the sliding groove 2311, and the first supporting block 225 cooperates with the sliding groove 2311 to limit the position of the first inserting rod 234.

[0061] The first spring 2312 is connected between the second supporting block 2310 and the pull plate 236, and the first spring 2312 is located outside the first inserting rod 234, and the first spring 2312 is used for resetting the first inserting rod 234.

[0062] 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 extruded when the pull plate 236 moves, and the first spring 2312 is contracted and stores the restoring force when it is extruded, the first inserting rod 234 is moved out of the first inserting groove 235 when the pull plate 236 moves away from the vertical sleeve, and the second inserting rod 238 is simultaneously moved out of the second inserting groove 239, so that the top cover 21 and the fixing block 231 are simultaneously fixed, the top cover 21 is opened by rotating, the heating wire 23 is taken out, the new heating wire 23 is put into the vertical casing 2, the fixing block 231 is inserted into the fixing groove 233, and then the top cover 21 is closed, the pull plate 236 is slowly loosened, and the pull plate 236 is reset under the action of the restoring force of the spring, the first inserting rod 234 is inserted into the first inserting groove 235 after the pull plate 236 is reset, the second inserting rod 238 is inserted into the second inserting groove 239, so that the top cover 21 and the heating wire 23 can be simultaneously fixed, the synchronism is improved, and the work efficiency is improved.

[0063] It is worth noting here that the water injection well head body 1 may be expanded, broken or pipeline blocked due to icing in a low temperature environment, which affects the normal operation of water injection, so that the purpose of anti-freezing is achieved through the cooperation of the heating wire 23;

[0064] The water injection well head body 1 may be deformed, aged or damaged due to thermal stress in a high temperature environment, which affects 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 pipe in a high temperature environment, and the purpose of high temperature resistance is achieved, and the use is more comprehensive.

[0065] Please refer to Figure 1 As shown in the figure, the second supporting plate 24 is connected below the heating wire 23 inside the vertical casing 2, and the second supporting plate 24 is used for supporting and fixing the motor 241.

[0066] The motor 241 is connected to the lower surface of the second supporting plate 24, the output end of the motor 241 penetrates through the second supporting plate 24 and is connected with the exhaust fan 242, and the motor 241 is used for driving the exhaust fan 242 to rotate.

[0067] The first inverted trapezoidal groove block 25 is connected with the annular block 251 and the second inverted trapezoidal groove block 252 in sequence from top to bottom in the middle of the vertical casing 2. The cross section of the first inverted trapezoidal groove block 25 is inverted trapezoidal, 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.

[0068] The cross section of the second inverted trapezoidal groove block 252 is normal trapezoidal. The inner diameter of the lower end of the first inverted trapezoidal groove block 25 is the same as that of the annular block 251, and the inner diameter of the upper end of the second inverted trapezoidal groove block 252 is the same as that of the annular block 251. Through this arrangement, when the heated air enters the middle of the vertical casing 2, the flow area of the air is narrowed, and the air is forced to pass through the narrow place at a higher speed to maintain constant flow. The increase of the flow rate will cause the local pressure to drop, thereby forming a pressure difference to push the air to accelerate, so as to ensure that the heated air can enter the horizontal casing 26 below, and the water injection wellhead body 1 can be fully heated.

[0069] 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.

[0070] The upper ends of the horizontal casings 26 are connected with the first guide plates 261 arranged symmetrically, and the first guide plates 261 are connected with the vertical casing 2. The first guide plates 261 are used to guide the heated air into the horizontal casings 26.

[0071] The inside of the horizontal casings 26 is connected with the spiral blades 262 corresponding to the positions of the first guide plates 261. The spiral blades 262 are used to guide the heated air, so that the heated air can fully be in the horizontal casings 26, avoiding that the air of the heating port is only above the inside of the horizontal casings 26.

[0072] The lower ends of the horizontal casings 26 are communicated with the first branch pipes 3 arranged symmetrically between the upper ends of the vertical casing 2, and the upper ends of the horizontal casings 26 are communicated with the second branch pipes 31 corresponding to the positions of the first branch pipes 3. Through the cooperation of the first branch pipes 3 and the second branch pipes 31, the heated air in the vertical casing 2 and the horizontal casings 26 can be guided to the upper end of the vertical casing 2, thereby reducing the waste of heat.

[0073] The inside of the first branch pipes 3 is connected with the second guide plates 32 corresponding to the positions of the second branch pipes 31. The second guide plates 32 are used to separate two flow areas, avoiding that the air in the first branch pipes 3 flows into the second branch pipes 31.

[0074] 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.

[0075] 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.

[0076] 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). A fixing block (231) is connected to the middle of the heating wire (23), and a first support plate (232) is connected to the lower part of the vertical sleeve (2) corresponding to the fixing block (231). A fixing groove (233) is opened in the middle of the first support plate (232) corresponding to the fixing block (231). The heating wire (23) is installed in the fixing groove (233) of the first support plate (232) through the fixing block (231). A first insert rod (234) is slidably connected above the vertical sleeve (2) at the position corresponding to the fixing block (231). A first slot (235) is opened on the fixing block (231) and the first support plate (232) at the position corresponding to the first insert rod (234). The first insert rod (234) is inserted into the first slot (235). A pull plate (236) is connected to the outer side of the end of the first insert rod (234) away from the fixing block (231). A fixing plate (237) is connected to the top cover (21) near the pull plate (236). The upper end of the pull plate (236) is close to the fixing plate (237). A second insert rod (238) is connected to one side of the plate (237). A second slot (239) is provided on the fixing plate (237) corresponding to the position of the second insert rod (238). The second insert rod (238) is inserted into the second slot (239). The pull plate (236) is used to move the first insert rod (234) out of the first slot (235) and at the same time, it can move the second insert rod (238) out of the second slot (239). The fixing block (231) is fixed in the fixing groove (233) of the first support plate (232) through the first insert rod (234).

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 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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