Wellhead casing head for oil production

Abstract

The present invention relates to the technical field of wellhead casing heads, and discloses a wellhead casing head for oil production, comprising a base, a casing fixedly connected to the inner wall of the base, and an input pipe fixedly connected to the top of the casing. When liquid refluxes due to high-pressure expansion of natural gas inside the wellhead, the liquid will be in a countercurrent state, and the liquid will generate an upward thrust. When the thrust passes through the position of the fixed plate, since the contact surface of the diverter groove and the liquid is larger than the plane of the fixed plate, the diverter groove will force the fixed plate and the folding plate to rotate around the fixed rod as the center. The upward pressure of the liquid will act on the side wall of the folding plate, causing the folding plate to rotate around the steering knuckle as the center. At this time, the liquid passing through the above position will be diverted, and under the influence of the bent folding plate, the above two water flows will eventually merge, and the liquid flow resistance will be increased, thereby reducing the damage of the countercurrent liquid to the external water pump.

Description

Technical Field

[0001] The invention relates to the technical field of wellhead casing heads, in particular to a wellhead casing head for oil production. Background Art

[0002] Casing heads are commonly used in the process of oil and natural gas extraction. The rotating wheel on the outer wall is used to control the flow and speed of the internal liquid. It is installed at the upper end of the surface casing string to fix the wellhead of the drilled well and connect the wellhead casing string to support the connection components of the technical casing and the oil layer casing. It can be used to seal the annular space between each layer of pipe and provide a transition connection for the installation of blowout preventers, tubing heads, and Christmas trees. In addition, through the two side ports on the casing head body, construction operations such as mud squeezing, monitoring, and adding balancing fluid can be carried out. Low-carbon extraction methods are mostly hydraulic fracturing.

[0003] The general process can be seen as the wellhead casing head injecting liquid into the mining hole through multiple input ports and performing pressure fracture on the ground. However, when natural gas leaks at the bottom, the high-pressure natural gas and oil will push the liquid to flow back, and the reversed liquid will impact the external water pump, causing damage to the water pump. To address the above problems, the following solutions are proposed. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a wellhead casing head for oil production, comprising a base, a casing fixedly connected to the inner wall of the base, and an input pipe fixedly connected to the top of the casing;

[0005] The shell mechanism is connected to the outer wall of the casing to transmit the external high-pressure water and various chemical substances to the inside of the casing;

[0006] The transmission mechanism is fixedly connected to the inner wall of the casing and is used to inject the liquid inside the casing into the oil production port;

[0007] The limiting mechanism is fixedly connected to the outer wall of the transmission mechanism and is used to effectively increase the resistance to the flow of the fluid when reverse flow occurs in the liquid inside the transmission mechanism;

[0008] Before use, the external liquid is first connected to the input tube and the shell mechanism, so that the external liquid can be transmitted to the inner wall of the sleeve through the input tube and the shell mechanism.

[0009] Preferably, the housing mechanism comprises:

[0010] A fixing component is connected through the outer wall of the casing;

[0011] A detection component is connected through the outer wall of the casing;

[0012] Among them, the fixed component is used to transmit various chemical substances, while the detection component will detect the hydraulic status inside the casing.

[0013] Preferably, the transmission mechanism includes:

[0014] An output assembly is fixedly connected to the bottom inner wall of the sleeve through a support member;

[0015] The support member includes an output pipe fixedly connected to the inner wall of the bottom of the casing;

[0016] A limiting assembly, the limiting assembly being rotatably connected to the inner wall of the output pipe via a rotating member;

[0017] The rotating member includes five fixed rods rotatably connected to the inner wall of the output pipe, and a rotating plate rotatably connected to the outer wall of the five fixed rods;

[0018] When the liquid in the output pipe flows backward, the upward impact force of the liquid will act on the outer wall of the restriction component, forcing the restriction component to deform and increase the pressure generated by the liquid backflow.

[0019] Preferably, the limiting mechanism includes:

[0020] A flow guide assembly, the flow guide assembly is fixedly connected to the bottom of the restriction assembly;

[0021] A flow diversion assembly, the flow diversion assembly is fixedly connected to the inner wall of the output pipe through an auxiliary component;

[0022] The auxiliary component includes a central axis rod fixedly connected to the inner wall of the output pipe;

[0023] When the restriction component is rotated by the counterflow liquid, the restriction component will drive the diversion component to rotate in the same direction and perform secondary diversion of the counterflow liquid.

[0024] Preferably, the output assembly includes a bevel ring fixedly connected to the inner wall of the output pipe;

[0025] When the liquid in the output pipe flows downward, the outer wall of the top of the bevel ring is inclined, which makes the liquid encounter less resistance when flowing downstream. However, when the liquid flows backward, the upward-rushing liquid will contact the flat surface at the bottom of the bevel ring, increasing the resistance to the liquid's reverse flow.

[0026] Preferably, the limiting assembly includes a folding plate rotatably connected to the bottom of the rotating plate, a steering knuckle is fixedly connected between the two folding plates, and a baffle is fixedly connected to the side wall of the folding plate;

[0027] Among them, in the countercurrent state, when the folding plate is subjected to pressure from bottom to top, the folding plate will bend with the steering knuckle as the center, and the outside of the folding plate will contact the baffle.

[0028] Preferably, the flow guide assembly includes a fixed plate fixedly connected to an end of the folding plate away from the rotating plate, and a diversion groove is provided on the side wall of the fixed plate;

[0029] When the liquid flows back, the liquid will pass through the plane of the fixed plate and the diversion groove. Since the contact surface between the liquid and the diversion groove is large, the folding plate and the rotating plate will rotate around the fixed rod.

[0030] Preferably, the flow diversion assembly includes a curved plate rotatably connected to the outer wall of the central shaft, a push rod rotatably connected to the inner wall of the curved plate, and an end of the push rod away from the curved plate is rotatably connected to the inner wall of the rotating plate;

[0031] When the rotating plate rotates, the rotating plate will force the arc plate to rotate around the central axis rod through the pushing rod, and the inclined arc plate will divert the liquid.

[0032] Preferably, the fixing assembly includes two feed pipes connected through the side wall of the casing, valves are connected through the outer walls of the two feed pipes, and an operating wheel is meshedly connected to the outer wall of the valve;

[0033] Among them, the staff can control the valve to close or open through the operating wheel.

[0034] Preferably, the detection assembly includes a measuring valve connected through the side wall of the casing, and a hydraulic instrument is connected through the outer wall of the measuring valve;

[0035] The hydraulic instrument will constantly monitor the hydraulic environment inside the casing; in addition, the five fixing rods are distributed in a mirror-image manner on the output pipe and the inner wall of the casing.

[0036] The present invention has the following beneficial effects:

[0037] (1) In the present invention, when the liquid refluxes due to the high pressure expansion of natural gas inside the wellhead, the liquid will appear in a countercurrent state, and the liquid will generate an upward thrust. When the thrust passes through the fixed plate position, since the contact surface between the diverter groove and the liquid is larger than the plane of the fixed plate, the diverter groove will force the fixed plate and the folding plate to rotate around the fixed rod, so that the folding plate rotates from the fixed plate to the folding plate. Figure 7 The state of F in the middle is transformed into Figure 2 In the state of L, through the application of the above components, in the state of liquid counterflow, the internal transmission mechanism and the restriction mechanism can increase the resistance to liquid flow and reduce the damage of the counterflow liquid to the external water pump.

[0038] (2) The present invention utilizes the above-mentioned characteristic that the countercurrent of the liquid forces the folding plate to tilt. A limiting component is provided inside the device. The upward pressure of the liquid will act on the side wall of the folding plate, causing the folding plate to rotate around the steering knuckle. Finally, the folding plate is forced to tilt from Figure 2 The state of L changes to Figure 8 In the U state, part of the liquid will contact the arc surface of the folding plate during the upward flow and flow along the arc surface of the folding plate, while the rest of the liquid will be less affected by the folding plate and will continue to move upward. Finally, the above two streams will eventually be in Figure 8 The two merged water flows will meet at the middle Z position, increasing the resistance to liquid flow. At the same time, the two merged water flows will contact the bottom of the bevel ring, slowing down the speed of liquid flow and effectively weakening the impact of impact force on the water pump.

[0039] (3) The present invention utilizes the above-mentioned rotating plate to rotate under pressure, and a diversion component is set inside the device. When the rotating plate rotates, the arc plate will be driven to rotate around the central axis through the push rod. During this process, since the top of the arc plate approaches the rotating plate, the bottom of the arc plate will be away from the rotating plate, so that the tail of the arc plate will contact more upstream liquid, such as Figure 8 In the shaded area of ​​J, the distance between the curved plate and the rotating plate remains unchanged. In the same time, more liquid is ejected outward along the inner wall of the curved plate, which speeds up the ejected liquid and increases the impact force of the turned liquid on the vertically upward liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 It is a schematic cross-sectional view of the overall structure of the present invention;

[0042] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0043] Figure 3 This is a schematic cross-sectional view of the housing mechanism of the present invention;

[0044] Figure 4 It is a cross-sectional schematic diagram of the transmission mechanism of the present invention;

[0045] Figure 5 For the present invention Figure 4 A magnified schematic diagram of point A in the middle;

[0046] Figure 6 For the present invention Figure 4 A magnified schematic diagram of point B in the middle;

[0047] Figure 7 This is a schematic diagram of the downstream working state of the present invention;

[0048] Figure 8 This is a schematic diagram of the countercurrent working state of the present invention.

[0049] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0050] In the figure: 1. Shell mechanism; 11. Fixed component; 12. Detection component; 13. Base; 14. Sleeve; 15. Input pipe; 111. Feed pipe; 112. Valve; 113. Operating wheel; 121. Measuring valve; 122. Hydraulic instrument; 2. Transmission mechanism; 21. Output component; 22. Limiting component; 211. Output pipe; 212. Bevel ring; 221. Fixed rod; 222. Rotating plate; 223. Steering knuckle; 224. Folding plate; 225. Baffle; 3. Limiting mechanism; 31. Guide component; 32. Diverter component; 311. Fixed plate; 312. Diverter trough; 321. Central axis rod; 322. Arc plate; 323. Push rod. DETAILED DESCRIPTION

[0051] 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.

[0052] For example 1, please refer to Figure 1-Figure 3 The present invention is a wellhead casing head for oil production, comprising a base 13, a casing 14 fixedly connected to the inner wall of the base 13, and an input pipe 15 fixedly connected to the top of the casing 14;

[0053] The shell mechanism 1 is connected to the outer wall of the casing 14 and transmits external high-pressure water and various chemical substances to the interior of the casing 14;

[0054] The transmission mechanism 2 is fixedly connected to the inner wall of the casing 14 and is used to inject the liquid inside the casing 14 into the oil production port;

[0055] The limiting mechanism 3 is fixedly connected to the outer wall of the transmission mechanism 2 and is used to effectively increase the resistance to the flow of the fluid when reverse flow occurs in the liquid inside the transmission mechanism 2;

[0056] Before use, the external liquid is first connected to the input tube 15 and the outer shell mechanism 1 , so that the external liquid can be transferred to the inner wall of the sleeve 14 through the input tube 15 and the outer shell mechanism 1 .

[0057] The housing mechanism 1 comprises:

[0058] The fixing assembly 11 is connected to the outer wall of the sleeve 14 through the fixing assembly 11;

[0059] The detection component 12 is connected to the outer wall of the sleeve 14;

[0060] The fixing assembly 11 is used to transmit various chemical substances, and the detection assembly 12 is used to detect the hydraulic state inside the casing 14 .

[0061] The transmission mechanism 2 includes:

[0062] The output assembly 21 is fixedly connected to the bottom inner wall of the sleeve 14 through a support member;

[0063] The support member includes an output pipe 211 fixedly connected to the inner wall of the bottom of the sleeve 14;

[0064] The limiting assembly 22 is rotatably connected to the inner wall of the output pipe 211 through a rotating member;

[0065] The rotating member includes five fixed rods 221 rotatably connected to the inner wall of the output tube 211, and a rotating plate 222 rotatably connected to the outer wall of the five fixed rods 221;

[0066] When in use, the mixed liquid is transferred from the casing 14 to the inner wall of the wellhead through the output pipe 211, and generally presents a flow state from top to bottom. At this time, the transmission mechanism 2 and the restriction mechanism 3 are in a straight state, presenting a state as shown in FIG. Figure 7 The state of F in the middle, and the contact surface with the liquid is reduced to the minimum. At this time, the liquid will flow downward along the path of V and eventually enter the wellhead;

[0067] When the liquid in the output pipe 211 flows backward, the upward impact force of the liquid will act on the outer wall of the limiting component 22, forcing the limiting component 22 to deform and increase the pressure generated by the liquid backflow.

[0068] Restriction agencies 3 include:

[0069] The flow guide component 31 is fixedly connected to the bottom of the restriction component 22;

[0070] The flow dividing assembly 32 is fixedly connected to the inner wall of the output pipe 211 through an auxiliary component;

[0071] The auxiliary component includes a central shaft rod 321 fixedly connected to the inner wall of the output tube 211;

[0072] When the restriction component 22 is rotated by the counterflow liquid, the restriction component 22 will drive the diversion component 32 to rotate in the same direction and perform secondary diversion of the counterflow liquid.

[0073] For example 2, please refer to Figure 3-Figure 8 The present invention is a wellhead casing head for oil production. Based on Example 1, the output assembly 21 includes a bevel ring 212 fixedly connected to the inner wall of the output pipe 211;

[0074] When the liquid in the output pipe 211 flows downward, the outer wall of the top of the bevel ring 212 is inclined, which makes the liquid encounter less resistance when flowing downstream. When the liquid flows backward, the upward-rushing liquid will contact the plane at the bottom of the bevel ring 212, increasing the resistance to the liquid's reverse flow.

[0075] The limiting assembly 22 includes a folding plate 224 rotatably connected to the bottom of the rotating plate 222 , a steering knuckle 223 fixedly connected between the two folding plates 224 , and a baffle 225 fixedly connected to the side wall of the folding plate 224 ;

[0076] In the counter-flow state, when the folding plate 224 is subjected to pressure from bottom to top, the folding plate 224 will bend with the steering knuckle 223 as the center, and the outer portion of the folding plate 224 will contact the baffle 225;

[0077] Taking advantage of the above-mentioned feature that the liquid counterflow forces the folding plate 224 to tilt, a limiting component 22 is set inside the device. The upward pressure of the liquid will act on the side wall of the folding plate 224, causing the folding plate 224 to rotate around the steering knuckle 223, and finally forcing the folding plate 224 to rotate from the steering knuckle 223. Figure 2 The state of L changes to Figure 8 In the U state, part of the liquid will also contact the arc surface of the folding plate 224 during the upward flow and flow along the arc surface of the folding plate 224, while the remaining liquid will continue to move upward with less influence from the folding plate 224. Finally, the above two streams will eventually be at Figure 8 The two merged water flows converge at the middle Z position, increasing the resistance to liquid flow. At the same time, the two merged water flows will contact the bottom of the slope ring 212, slowing down the speed of liquid flow and effectively weakening the impact of the impact force on the water pump.

[0078] The flow guide assembly 31 includes a fixed plate 311 fixedly connected to the end of the folding plate 224 away from the rotating plate 222, and a diversion groove 312 is opened on the side wall of the fixed plate 311;

[0079] When the liquid refluxes due to the high pressure expansion of natural gas inside the wellhead, the liquid will flow back and generate an upward thrust. When the thrust passes through the fixed plate 311, the contact surface between the diverter groove 312 and the liquid is larger than the plane of the fixed plate 311. At this time, the diverter groove 312 will force the fixed plate 311 and the folding plate 224 to rotate around the fixed rod 221, so that the folding plate 224 rotates from the fixed plate 311 to the folding plate 224. Figure 7 The state of F in the middle is transformed into Figure 2In the state of L, through the application of the above components, in the state of liquid counterflow, the internal transmission mechanism 2 and the restriction mechanism 3 can increase the resistance of liquid flow and reduce the damage of the counterflow liquid to the external water pump;

[0080] When the liquid flows back, the liquid will pass through the plane of the fixed plate 311 and the diversion groove 312. Since the contact surface between the liquid and the diversion groove 312 is large, the folding plate 224 and the rotating plate 222 rotate around the fixed rod 221.

[0081] The flow dividing assembly 32 includes a curved plate 322 rotatably connected to the outer wall of the central shaft 321, a push rod 323 rotatably connected to the inner wall of the curved plate 322, and an end of the push rod 323 away from the curved plate 322 is rotatably connected to the inner wall of the rotating plate 222;

[0082] The rotating plate 222 is rotated under pressure, and a diversion assembly 32 is provided inside the device. When the rotating plate 222 rotates, the arc plate 322 is driven to rotate around the central axis 321 through the push rod 323. During this process, the top of the arc plate 322 approaches the rotating plate 222, which makes the bottom position of the arc plate 322 move away from the rotating plate 222. This makes the tail of the arc plate 322 contact with more upstream liquid, such as Figure 8 In the shaded area J in the middle, the distance between the curved plate 322 and the rotating plate 222 remains unchanged. In the same time, more liquid is ejected outward along the inner wall of the curved plate 322, which speeds up the ejected liquid and increases the impact force of the turned liquid on the vertically upward liquid.

[0083] When the rotating plate 222 rotates, the rotating plate 222 will force the arc plate 322 to rotate around the central axis rod 321 through the pushing rod 323, and the inclined arc plate 322 will divert the liquid.

[0084] The fixing assembly 11 includes two feed pipes 111 connected to the side wall of the sleeve 14. The outer walls of the two feed pipes 111 are connected to valves 112. The outer walls of the valves 112 are engaged with an operating wheel 113.

[0085] Before use, the base 13 is first fixed in the desired position, and then the external pipeline is connected to the input pipe 15 and the feed pipe 111, and the bottom of the output pipe 211 is connected to the wellhead. Then the staff turns the operating wheel 113 to open the valve 112, ensuring that the external high-pressure water and various chemicals are transmitted to the interior of the casing 14;

[0086] The staff can control the valve 112 to close or open through the operating wheel 113.

[0087] The detection assembly 12 includes a measuring valve 121 connected to the side wall of the casing 14, and a hydraulic instrument 122 is connected to the outer wall of the measuring valve 121;

[0088] The hydraulic instrument 122 will constantly detect the hydraulic environment inside the casing 14 . In addition, the five fixing rods 221 are distributed in a mirror-image manner on the output pipe 211 and the inner wall of the casing 14 .

[0089] A specific application of this embodiment is as follows: before use, the base 13 is first fixed in the desired position, and then the external pipeline is connected to the input pipe 15 and the feed pipe 111, and the bottom of the output pipe 211 is connected to the wellhead. Then, the staff turns the operating wheel 113 to open the valve 112, ensuring that the external high-pressure water and various chemicals are transmitted to the interior of the casing 14;

[0090] When in use, the mixed liquid is transferred from the casing 14 to the inner wall of the wellhead through the output pipe 211, and generally presents a flow state from top to bottom. At this time, the transmission mechanism 2 and the restriction mechanism 3 are in a straight state, presenting a state as shown in FIG. Figure 7 The state of F in the middle, and the contact surface with the liquid is reduced to the minimum. At this time, the liquid will flow downward along the path of V and eventually enter the wellhead;

[0091] When the liquid refluxes due to the high pressure expansion of natural gas inside the wellhead, the liquid will flow back and generate an upward thrust. When the thrust passes through the fixed plate 311, the contact surface between the diverter groove 312 and the liquid is larger than the plane of the fixed plate 311. At this time, the diverter groove 312 will force the fixed plate 311 and the folding plate 224 to rotate around the fixed rod 221, so that the folding plate 224 rotates from the fixed plate 311 to the folding plate 224. Figure 7 The state of F in the middle is transformed into Figure 2 In the state of L, through the application of the above components, in the state of liquid counterflow, the internal transmission mechanism 2 and the restriction mechanism 3 can increase the resistance of liquid flow and reduce the damage of the counterflow liquid to the external water pump;

[0092] Taking advantage of the above-mentioned feature that the liquid counterflow forces the folding plate 224 to tilt, a limiting component 22 is set inside the device. The upward pressure of the liquid will act on the side wall of the folding plate 224, causing the folding plate 224 to rotate around the steering knuckle 223, and finally forcing the folding plate 224 to rotate from the steering knuckle 223. Figure 2 The state of L changes to Figure 8 In the U state, part of the liquid will also contact the arc surface of the folding plate 224 during the upward flow and flow along the arc surface of the folding plate 224, while the remaining liquid will continue to move upward with less influence from the folding plate 224. Finally, the above two streams will eventually be at Figure 8The two merged water flows converge at the middle Z position, increasing the resistance to liquid flow. At the same time, the two merged water flows will contact the bottom of the slope ring 212, slowing down the speed of liquid flow and effectively weakening the impact of the impact force on the water pump.

[0093] The rotating plate 222 is rotated under pressure, and a diversion assembly 32 is provided inside the device. When the rotating plate 222 rotates, the arc plate 322 is driven to rotate around the central axis 321 through the push rod 323. During this process, the top of the arc plate 322 approaches the rotating plate 222, which makes the bottom position of the arc plate 322 move away from the rotating plate 222. This makes the tail of the arc plate 322 contact with more upstream liquid, such as Figure 8 In the shaded area of ​​J, the distance between the arc plate 322 and the rotating plate 222 remains unchanged. In the same time, more liquid is ejected outward along the inner wall of the arc plate 322, which speeds up the ejected liquid and increases the impact force of the turned liquid on the vertically upward liquid.

[0094] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A wellhead casing head for oil production, comprising a base (13), a casing (14) fixedly connected to the inner wall of the base (13), and an input pipe (15) fixedly connected to the top of the casing (14), characterized in that: Also includes: A shell mechanism (1), the shell mechanism (1) being connected to the outer wall of the sleeve (14) so ​​as to transmit external high-pressure water and various chemical substances to the interior of the sleeve (14); A transmission mechanism (2), the transmission mechanism (2) being fixedly connected to the inner wall of the casing (14) and used for injecting liquid inside the casing (14) into the oil production port; A limiting mechanism (3), the limiting mechanism (3) being fixedly connected to the outer wall of the transmission mechanism (2) and being used to effectively increase the resistance to the flow of the fluid when reverse flow occurs in the liquid inside the transmission mechanism (2); Before use, the external liquid is first connected to the input tube (15) and the outer shell mechanism (1), so that the external liquid can be transmitted to the inner wall of the sleeve (14) through the input tube (15) and the outer shell mechanism (1); The transmission mechanism (2) comprises: An output assembly (21), wherein the output assembly (21) is fixedly connected to the bottom inner wall of the sleeve (14) via a support member; The support member comprises an output pipe (211) fixedly connected to the inner wall of the bottom of the sleeve (14); a limiting assembly (22), the limiting assembly (22) being rotatably connected to the inner wall of the output pipe (211) via a rotating member; The rotating member comprises five fixed rods (221) rotatably connected to the inner wall of the output pipe (211), and a rotating plate (222) is rotatably connected to the outer walls of the five fixed rods (221); When the liquid in the output pipe (211) flows backward, the upward impact force of the liquid will act on the outer wall of the restriction component (22), forcing the restriction component (22) to deform, thereby increasing the pressure generated by the liquid backflow; The limiting mechanism (3) comprises: A flow guide assembly (31), wherein the flow guide assembly (31) is fixedly connected to the bottom of the restriction assembly (22); A flow diversion assembly (32), the flow diversion assembly (32) being fixedly connected to the inner wall of the output pipe (211) via an auxiliary component; The auxiliary component includes a central axis rod (321) fixedly connected to the inner wall of the output tube (211); When the restriction component (22) is rotated by the counterflow liquid, the restriction component (22) drives the diversion component (32) to rotate in the same direction and performs secondary diversion on the counterflow liquid.

2. The wellhead casing head for oil production according to claim 1, characterized in that: The housing mechanism (1) comprises: A fixing assembly (11), the fixing assembly (11) being connected to the outer wall of the sleeve (14); A detection component (12), the detection component (12) being connected to the outer wall of the sleeve (14); The fixing component (11) is used to transmit various chemical substances, and the detection component (12) is used to detect the hydraulic state inside the casing (14).

3. The wellhead casing head for oil production according to claim 2, characterized in that: The output assembly (21) includes a bevel ring (212) fixedly connected to the inner wall of the output pipe (211); When the liquid in the output pipe (211) flows downward, the outer wall of the top of the bevel ring (212) is inclined, which reduces the resistance encountered by the liquid when it flows downstream. However, when the liquid flows backward, the upward-impacting liquid will contact the plane at the bottom of the bevel ring (212), increasing the resistance to the liquid's reverse flow.

4. The wellhead casing head for oil production according to claim 3, characterized in that: The limiting assembly (22) includes a folding plate (224) rotatably connected to the bottom of the rotating plate (222), a steering knuckle (223) is fixedly connected between the two folding plates (224), and a baffle (225) is fixedly connected to the side wall of the folding plate (224); In the countercurrent state, when the folding plate (224) is subjected to pressure from bottom to top, the folding plate (224) will bend with the steering knuckle (223) as the center, and the outside of the folding plate (224) will contact the baffle (225).

5. The wellhead casing head for oil production according to claim 4, characterized in that: The flow guide assembly (31) comprises a fixed plate (311) fixedly connected to one end of the folding plate (224) away from the rotating plate (222), and a diversion groove (312) is provided on the side wall of the fixed plate (311); When the liquid flows back, the liquid will pass through the plane of the fixed plate (311) and the diversion groove (312). Since the contact surface between the liquid and the diversion groove (312) is large, the folding plate (224) and the rotating plate (222) rotate around the fixed rod (221).

6. The wellhead casing head for oil production according to claim 5, characterized in that: The diversion assembly (32) includes a curved plate (322) rotatably connected to the outer wall of the central shaft (321), a push rod (323) rotatably connected to the inner wall of the curved plate (322), and an end of the push rod (323) away from the curved plate (322) is rotatably connected to the inner wall of the rotating plate (222); When the rotating plate (222) rotates, the rotating plate (222) forces the arc plate (322) to rotate around the central axis (321) through the push rod (323), and the inclined arc plate (322) diverts the liquid.

7. The wellhead casing head for oil production according to claim 6, characterized in that: The fixing assembly (11) comprises two feed pipes (111) connected through the side wall of the sleeve (14); valves (112) are connected through the outer walls of the two feed pipes (111); and an operating wheel (113) is meshedly connected to the outer wall of the valve (112); The staff can control the valve (112) to close or open via the operating wheel (113).

8. The wellhead casing head for oil production according to claim 7, characterized in that: The detection assembly (12) comprises a measuring valve (121) connected to the side wall of the casing (14), and a hydraulic instrument (122) is connected to the outer wall of the measuring valve (121); The hydraulic instrument (122) will constantly detect the hydraulic environment inside the casing (14); in addition, the five fixing rods (221) are distributed in a mirror-image manner on the output pipe (211) and the inner wall of the casing (14).

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