Wellhead with anti-theft structure for oil exploitation

Abstract

The utility model relates to the field of well mouths for oil exploitation, in particular to a well mouth with an anti-theft structure for oil exploitation, which comprises a well mouth, a protective cylinder with a square inside and a round outside is mounted on the well mouth, a drainage gap is formed between the bottom end of the protective cylinder and the top end of the well mouth, and a plurality of drainage holes are formed in the bottom of the protective cylinder in an annular array mode. A conical cover plate assembly is connected into the protective cylinder and composed of four equally-divided triangular cover plates, the triangular cover plates are obliquely arranged, the side edges of every two adjacent triangular cover plates are connected with rubber pads respectively, and receding gaps are formed between the bottom ends of the outer sides of the triangular cover plates and the inner wall of the protective cylinder respectively. Opening and closing of the triangular cover plate are controlled through the driving rod assembly to achieve burglary prevention, liquid such as rainwater can be guided to flow to the drainage hole in the bottom of the protection barrel, accumulation of the rainwater on the triangular cover plate is reduced, and the rainwater is effectively drained along the receding gap and the drainage hole.

Description

Technical Field

[0001] The utility model relates to the field of wellheads for oil exploitation, in particular to a wellhead for oil exploitation with an anti-theft structure. Background Art

[0002] The oil production wellhead is the exit of the oil and gas channel between the ground and the underground oil and gas layer, and is also the starting point of oil production operations. The wellhead device is usually installed with casing heads and tubing heads. These components together constitute the oil production system. As an important energy source and chemical raw material, oil has extremely high economic value. For this reason, some oil production wellheads are equipped with some anti-theft structures for anti-theft.

[0003] Among them, the Chinese utility model patent with publication number CN218581584U discloses an anti-theft device in an oil production well, including a barrel body, a long strip-shaped driving hole is provided on the inner wall of the barrel body, the length direction of the driving hole is consistent with the axis direction of the barrel body, and a horizontal guide rod is provided in the middle of the driving hole; a driving rod, the middle of the driving rod has a sliding hole, the guide rod passes through the sliding hole, and the two ends of the driving rod are respectively located on the inner and outer sides of the barrel body; a cover plate, which is an isosceles triangle structure, and the two ends where the bottom edge of the cover plate is located are respectively hinged to the inner wall of the barrel body, and one side plate surface of the cover plate is hinged to one end of the driving rod, and the hinge point is close to the bottom edge of the cover plate; a locking assembly, which is an annular structure and is movably arranged on a circle around the top of the barrel body, and the bottom of the locking assembly has an output end that can move up and down, and the output end is hinged to the end of the driving rod away from the cover plate.

[0004] In the above-mentioned prior art, the locking assembly moves downward, so that one end of the driving rod also moves downward, driving the suspended end of the cover plate to close, so as to form a barrier in the middle of the barrel body, so that the wellhead cannot enter to steal the equipment for theft. However, the cover plate still has defects in use. When encountering rainy and snowy weather, the cover plate and the barrel body are closed, and some rainwater will accumulate at the angle between the cover plate and the barrel body. Once the cover plate is opened, the accumulated rainwater will flow into the wellhead, thereby increasing the total amount of liquid in the well, reducing the efficiency of crude oil extraction, and causing some devices to rust and reduce the service life. Therefore, the above-mentioned prior art does not have drainage capabilities. In addition, the above-mentioned prior art aligns the connecting buckle and the locking buckle, installs an encryption lock to lock it for anti-theft, but because the connecting buckle and the locking buckle are exposed on the outside of the wellhead, they are not concealed. Utility Model Content

[0005] The main technical problem solved by the utility model is to provide a wellhead for oil mining with an anti-theft structure, which is convenient for draining rainwater and preventing rainwater from accumulating in the wellhead, while improving the concealment of the anti-theft structure.

[0006] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a wellhead for oil mining with an anti-theft structure, comprising: a wellhead, a protective cylinder with a square inside and a round outside is installed on the wellhead, a drainage gap is formed between the bottom end of the protective cylinder and the top end of the wellhead, a plurality of drainage holes are opened in a circular array at the bottom of the protective cylinder, and a conical cover plate assembly is connected inside the protective cylinder;

[0007] The conical cover plate assembly is composed of four equally divided triangular cover plates, the triangular cover plates are arranged tilted, the sides of two adjacent triangular cover plates are connected with rubber pads, the outer bottom ends of the triangular cover plates and the inner wall of the protective tube form clearance gaps, the outer bottom ends of the triangular cover plates are connected with a plurality of hinges at intervals, one end of the hinges is connected with the protective tube, the outer top ends of the triangular cover plates are connected with driving rod assemblies, and when the triangular cover plates are closed, the inner bottom ends thereof are connected with the wellhead in abutment with each other;

[0008] The side wall of the protective tube is provided with an active opening matched with the triangular cover plate, the driving rod assembly is installed in the active opening, and the outer circular top end of the protective tube is connected to a limited locking mechanism.

[0009] By adopting the above technical solution, when rainwater enters the protective tube, the four equally divided triangular cover plates not only protect the wellhead from theft, but also cooperate with the rubber pads to enhance the sealing between the triangular cover plates, while reducing the gap caused by the cover plates not being tightly closed. The opening and closing of the triangular cover plates can be controlled by the operation of the driving rod assembly, and liquids such as rainwater can be guided to flow to the drainage holes at the bottom of the protective tube, thereby reducing the accumulation of rainwater on the triangular cover plates, and effectively discharging rainwater along the clearance gap and drainage holes. The limit locking mechanism is used to lock the driving rod assembly and the triangular cover plates to prevent unauthorized personnel from opening the wellhead, thereby improving the safety of the wellhead and enhancing the anti-theft effect.

[0010] In a preferred example, the utility model can be further configured as follows: the driving rod assembly includes a connecting block, a rod body and a waist-shaped opening on the rod body, a limiting rod is provided in the waist-shaped opening, both ends of the limiting rod are connected to the movable opening, one end of the rod body begins to have a notch, and the other end is rotatably connected to a driving ring, the notch is rotatably connected to the connecting block through a pin shaft, the driving ring is located on the outside of the protective tube, the bottom end of the outer surface of the protective tube is connected to a hook matching the movable opening, and the hooks are respectively located below the driving ring.

[0011] By adopting the above technical solution, the driving ring is operated to drive the movement of the rod body to control the opening and closing of the triangular cover plate, and the waist-shaped mouth provides a guide for the limit rod, so that the limit rod can move along a predetermined trajectory. At the same time, under the action of the movable mouth, the movement trajectory of the rod body is effectively limited to prevent damage or loss of control caused by excessive movement. The driving ring is located on the outside of the protective tube and is rotatably connected to the other end of the rod body. By operating the driving ring, the movement of the rod body can be easily controlled to achieve the opening and closing of the triangular cover plate. The design of the driving ring allows the operator to operate outside the wellhead, which improves the convenience and safety of the operation. After the triangular cover plate is opened, the driving ring is tilted downward and hung on the hook, which can play an auxiliary fixing role.

[0012] In a preferred example, the utility model can be further configured as follows: the limit locking mechanism includes a rotating ring and a ring body connected to the top of the protective tube surface, the ring body is provided with an arc-shaped groove corresponding to the rod body, and the arc-shaped plates are respectively provided in the arc-shaped grooves. The tops of the arc-shaped plates are respectively connected to the rotating rings, and a limit opening is provided on one side of the arc-shaped plate. When the rotating ring rotates, the limit opening is clamped to the surface of the rod body, and the arc-shaped plate is located at the outermost edge of the arc-shaped groove. A number of universal balls are connected to the bottom of the rotating ring at intervals, and the universal balls are respectively in rolling contact with the ring body, and a fixing structure is respectively provided between each of the arc plates and the ring body.

[0013] By adopting the above technical solution, after the triangular cover is opened or closed, the rotating ring can be rotated to lock or unlock the rod body. When the rotating ring rotates, the arc plate will move accordingly, so that the limit port is clamped on the surface of the rod body to prevent the rod body from moving freely, thereby locking or releasing the triangular cover plate. When the rotating ring rotates, the universal ball provides support for its bottom and reduces the friction resistance of the rotating ring during the rotation process, making the operation smoother. When the rotating ring is in a locked state, the fixed structure reinforces the connection between the arc plate and the ring body to prevent loosening or falling off due to external force and improve the anti-theft effect.

[0014] In a preferred example, the utility model can be further configured as follows: the fixing structure includes a countersunk hole opened on the outer circle of the ring body, the arc plate is provided with a through hole matching the countersunk hole, the countersunk hole is threadedly connected with a special-shaped bolt, and when the limit port is clamped to the surface of the rod body, the special-shaped bolt passes through the through hole.

[0015] By adopting the above technical solution, when the limit opening is clamped to the surface of the rod body and the arc plate is located at the outermost edge of the arc groove, the countersunk hole and the through hole coincide with each other. At this time, the special-shaped bolt is passed through the through hole on the arc plate and tightened, so that the arc plate and the ring body can be tightly connected together, thereby achieving a locking effect and fixing the triangular cover plate when it is locked, and the special-shaped bolt can also be concealed.

[0016] In a preferred example, the utility model can be further configured as follows: the hinged part includes a hinged head and a hinged seat, the hinged seat is connected to the inner wall of the protective tube, the hinged head is connected to the triangular cover plate, and the hinged head and the hinged seat are connected by a pin shaft.

[0017] By adopting the above technical solution, the mutual cooperation of the hinge head, the hinge seat and the pin shaft realizes the flexible rotation between the triangular cover plate and the protective tube.

[0018] In a preferred example, the present invention can be further configured as follows: the bottom of the protective tube is conical.

[0019] By adopting the above technical solution, the bottom of the protective tube is designed to be conical, which can more effectively guide and accelerate the rainwater entering the protective tube to flow to the bottom drainage hole, so that the water flows naturally under the action of gravity and flows out, reducing the residence time of accumulated water in the protective tube, thereby enhancing the drainage effect.

[0020] In summary, the utility model includes at least one of the following beneficial technical effects of a wellhead having an anti-theft structure for oil mining:

[0021] 1. The driving rod assembly controls the opening and closing of the triangular cover to prevent the wellhead from theft. The rod body can be locked or unlocked by rotating the rotating ring. The closed state of the triangular cover can be fixed with the limit locking mechanism to prevent illegal intrusion and ensure the safety of the equipment inside the wellhead.

[0022] 2. When the limit opening is accurately connected to the surface of the rod body and the arc plate is located at the edge of the arc groove, the countersunk hole and the through hole on the arc plate automatically overlap. By tightening the special-shaped bolt, a firm connection is formed between the arc plate and the ring body, which not only realizes the stable locking of the triangular cover plate, but also enhances the safety of the entire wellhead device. At the same time, after the special-shaped bolt is tightened, its head sinks into the countersunk hole, realizing the concealed treatment of the bolt.

[0023] 3. The driving rod assembly not only controls the opening and closing of the triangular cover to prevent theft, but also guides rainwater and other liquids to flow to the drainage holes at the bottom of the protective tube, thereby reducing the accumulation of rainwater on the triangular cover and effectively discharging rainwater along the gaps and drainage holes. The bottom of the protective tube is designed to be conical, which enhances the drainage and water-proofing capabilities of the device, effectively guides and accelerates the discharge of water, reduces the residence time of accumulated water in the protective tube, and thus avoids corrosion and other problems caused by long-term water accumulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0025] Figure 1 It is a schematic diagram of the structure of the utility model;

[0026] Figure 2 This is a structural schematic diagram of the conical cover plate assembly of the utility model;

[0027] Figure 3 It is a structural schematic diagram of the notch of the utility model;

[0028] Figure 4 This is a structural schematic diagram of the limit locking mechanism of the utility model;

[0029] Figure 5 for Figure 4 Exploded diagram.

[0030] In the figure: 1, wellhead; 2, protective tube; 3, drainage hole; 4, hook; 50, conical cover plate assembly; 60, driving rod assembly; 70, limit locking mechanism; 8, movable opening;

[0031] 51. triangular cover plate; 52. rubber pad; 53. hinge;

[0032] 61. Connecting block; 62. Rod body; 63. Waist-shaped opening; 64. Limiting rod; 65. Notch; 66. Driving ring;

[0033] 71. rotating ring; 72. ring body; 73. arc-shaped notch; 74. arc-shaped plate; 75. limit opening; 76. universal ball; 77. fixed structure;

[0034] 531, hinged head; 532, hinged seat;

[0035] 771. Countersunk hole; 772. Through hole; 773. Special-shaped bolt. DETAILED DESCRIPTION

[0036] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0037] It should be noted that these drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0038] Reference Figure 1-5 , a wellhead for oil mining with an anti-theft structure disclosed by the utility model, comprising: a wellhead 1, a protective cylinder 2 with an inner square and an outer circle is installed on the wellhead 1, a drainage gap is formed between the bottom end of the protective cylinder 2 and the top end of the wellhead 1, a plurality of drainage holes 3 are opened in a circular array at the bottom of the protective cylinder 2, the bottom of the protective cylinder 2 is conical, a conical cover plate assembly 50 is connected inside the protective cylinder 2, the conical cover plate assembly 50 is composed of four equally divided triangular cover plates 51, the triangular cover plates 51 are respectively inclined, the sides of two adjacent triangular cover plates 51 are respectively connected with rubber pads 52, the outer bottom end of the triangular cover plate 51 is connected to the inner wall of the protective cylinder 2 A clearance gap is formed respectively, and a plurality of hinged parts 53 are connected to the outer bottom ends of the triangular cover plates 51 at intervals. One end of the hinged part 53 is connected to the protective tube 2. The hinged part 53 includes a hinged head 531 and a hinged seat 532. The hinged seat 532 is connected to the inner wall of the protective tube 2. The hinged head 531 is connected to the triangular cover plate 51. The hinged head 531 and the hinged seat 532 are connected by a pin shaft. The outer top ends of the triangular cover plates 51 are respectively connected to the driving rod assemblies 60. When the triangular cover plates 51 are closed, the inner bottom ends thereof are connected to the wellhead 1. The side walls of the protective tube 2 are provided with movable openings 8 matching the triangular cover plates 51. The driving rod assemblies 60 are connected to the outer top ends of the triangular cover plates 51. The movable rod assembly 60 is installed in the movable opening 8, and the outer round top end of the protective tube 2 is connected to the limited locking mechanism 70; the triangular cover plate 51 is an equilateral triangle, and the hinge parts 53 are preferably three, respectively on both sides and the middle position of the bottom of the triangular cover plate 51, to improve its structural strength and ensure flexible rotation. The inclination angle of the triangular cover plate 51 when closed is between 20-60 degrees, which enhances its structural stability, disperses pressure, reduces stress concentration, and thus prolongs the service life of the triangular cover plate 51. When rainwater enters the protective tube 2, the four equally divided triangular cover plates 51 not only protect the wellhead 1 from theft, but also cooperate with the rubber pad 52 to enhance The sealing between the triangular cover plates 51 reduces the gap caused by the loose closure of the triangular cover plates 51, and controls the opening and closing of the triangular cover plates 51 through the operation of the driving rod assembly 60, and can also guide rainwater and other liquids to flow to the bottom drainage hole 3 of the protective tube 2. At the same time, in conjunction with the bottom inclination angle, it accelerates the discharge of water and reduces the accumulation of rainwater on the triangular cover plates 51, effectively allowing rainwater to be discharged along the clearance gap and the drainage hole 3, and at the same time cooperates with the limit locking mechanism 70 to lock the driving rod assembly 60 and the triangular cover plates 51 to prevent unauthorized personnel from opening the wellhead 1, which can not only enhance the anti-theft effect of the wellhead 1, but also prevent water accumulation in the wellhead 1.

[0039] The driving rod assembly 60 includes a connecting block 61, a rod body 62 and a waist-shaped opening 63 on the rod body 62. A limiting rod 64 is arranged in the waist-shaped opening 63. Both ends of the limiting rod 64 are connected to the movable opening 8. A notch 65 is formed at one end of the rod body 62, and a driving ring 66 is rotatably connected to the other end. The notch 65 is rotatably connected to the connecting block 61 through a pin. The driving ring 66 is located on the outside of the protective tube 2. The bottom end of the outer surface of the protective tube 2 is connected to a hook 4 matching the movable opening 8. The hooks 4 are respectively located below the driving ring 66. The staff brings the protective tube 2 with the driving ring 66. The movable rod body 62 moves along the predetermined trajectory of the waist-shaped opening 63, and after opening or closing the triangular cover plate 51, the movable opening 8 and the limit locking mechanism 70 are used to limit the rod body 62. After the triangular cover plate 51 is opened, the driving ring 66 is tilted downward, and by rotating it and hanging it on the hook 4, it can play an auxiliary fixing role and maintain the open state of the wellhead 1. In addition, after the triangular cover plate 51 is closed, its limit rod 64 is connected to one end of the inner cavity of the waist-shaped opening 63, so that a single person can complete the opening and closing of the anti-theft device of the wellhead 1.

[0040] The limit locking mechanism 70 includes a rotating ring 71 and a ring body 72 connected to the top of the surface of the protective tube 2. The ring body 72 is provided with an arc-shaped notch 73 corresponding to the rod body 62. The arc-shaped notch 73 is provided with an arc plate 74. The top of the arc plate 74 is connected to the rotating ring 71. One side of the arc plate 74 is provided with a limit opening 75. When the rotating ring 71 rotates, the limit opening 75 is clamped to the surface of the rod body 62, and the arc plate 74 is located at the edge of the arc notch 73. The bottom of the rotating ring 71 A plurality of universal balls 76 are connected at intervals, and the universal balls 76 are in rolling contact with the ring body 72 respectively. A fixing structure 77 is respectively provided between each arc plate 74 and the ring body 72. The fixing structure 77 includes a countersunk hole 771 opened on the outer circle of the ring body 72, and a through hole 772 matching the countersunk hole 771 is opened on the arc plate 74. A special-shaped bolt 773 is connected to the inner thread of the countersunk hole 771. When the limit opening 75 is clamped to the surface of the rod body 62, the special-shaped bolt 773 passes through the through hole 772; The nut of each special-shaped bolt 773 has a different shape, and a rubber plug is used to seal the countersunk hole 771, which effectively improves the anti-theft effect. After the triangular cover plate 51 is closed, the rotating ring 71 can be rotated to lock the rod body 62. When the rotating ring 71 rotates, the arc plate 74 will move accordingly, so that the limit opening 75 is clamped on the surface of the rod body 62 to prevent the rod body 62 from moving freely, thereby realizing the locking or release of the triangular cover plate 51, and at the same time cooperating with the universal ball 76 to provide support for its bottom and To reduce the frictional resistance of the rotating ring 71 during rotation, when the limit opening 75 is clamped to the surface of the rod body 62 and the arc plate 74 is located at the outermost edge of the arc groove 73, the countersunk hole 771 and the through hole 772 coincide with each other. At this time, the special-shaped bolt 773 is passed through the through hole 772 on the arc plate 74 and tightened, so that the arc plate 74 and the ring body 72 can be tightly connected together, achieving a locking effect and locking the triangular cover plate 51, and the special-shaped bolt 773 can also be concealed.

[0041] The implementation principle of this embodiment is as follows: when in use, the staff drives the rod body 62 to swing in the movable opening 8 through the driving ring 66 in turn, so that it moves along the predetermined trajectory of the waist-shaped opening 63, and opens or closes the triangular cover plate 51; after the triangular cover plate 51 is closed, the limit rod 64 is in contact with one end of the inner cavity of the waist-shaped opening 63, and the driving ring 66 is located at the top, and then the remaining triangular cover plates 51 are closed in turn. At this time, the four equally divided triangular cover plates 51 cooperate with the rubber pad 52 to seal the wellhead 1, so that the wellhead 1 cannot be entered to steal the equipment, and then the rotating ring 71 is rotated to drive the arc-shaped cover plate 51 to close the wellhead 1. The plate 74 rotates so that the limit opening 75 is clamped on the surface of the rod body 62 to prevent the rod body 62 from moving freely, thereby locking the triangular cover plate 51. At this time, when the arc plate 74 is located at the outermost edge of the arc groove 73, the countersunk hole 771 and the through hole 772 coincide with each other. The staff uses corresponding tools such as a socket wrench to turn the special-shaped bolt 773 in sequence to make it pass through the through hole 772 on the arc plate 74 and tighten it. The arc plate 74 and the ring body 72 can be tightly connected together to achieve a locking effect and lock the triangular cover plate 51. At this time, the special-shaped bolt 773 is hidden in the countersunk hole 771.

[0042] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A wellhead for oil mining with an anti-theft structure, characterized in that: include: A wellhead (1), wherein a protective cylinder (2) with a square inner side and a round outer side is installed on the wellhead (1), a drainage gap is formed between the bottom end of the protective cylinder (2) and the top end of the wellhead (1), a plurality of drainage holes (3) are formed in an annular array at the bottom of the protective cylinder (2), and a conical cover plate assembly (50) is connected inside the protective cylinder (2); The conical cover plate assembly (50) is composed of four equally divided triangular cover plates (51), the triangular cover plates (51) are arranged at an angle, and the sides of two adjacent triangular cover plates (51) are respectively connected with rubber pads (52), and the outer bottom ends of the triangular cover plates (51) and the inner wall of the protective tube (2) respectively form a clearance gap, and the outer bottom ends of the triangular cover plates (51) are respectively connected with a plurality of hinges (53) at intervals, and one end of the hinges (53) is connected to the protective tube (2), and the outer top ends of the triangular cover plates (51) are respectively connected with driving rod assemblies (60), and when the triangular cover plates (51) are respectively closed, the inner bottom ends thereof are in contact with the wellhead (1); The side wall of the protective tube (2) is provided with a movable opening (8) matching the triangular cover plate (51), the driving rod assembly (60) is installed in the movable opening (8), and the outer round top end of the protective tube (2) is connected to a limited locking mechanism (70).

2. The oil wellhead with anti-theft structure according to claim 1, characterized in that: The driving rod assembly (60) comprises a connecting block (61), a rod body (62) and a waist-shaped opening (63) on the rod body (62); a limiting rod (64) is arranged in the waist-shaped opening (63); both ends of the limiting rod (64) are connected to the movable opening (8); a notch (65) is formed at one end of the rod body (62); and a driving ring (66) is rotatably connected to the other end; the notch (65) is rotatably connected to the connecting block (61) via a pin shaft; the driving ring (66) is located on the outside of the protective tube (2); a hook (4) matching the movable opening (8) is connected to the bottom end of the outer surface of the protective tube (2); and the hooks (4) are respectively located below the driving ring (66).

3. The oil wellhead with anti-theft structure according to claim 1, characterized in that: The limit locking mechanism (70) comprises a rotating ring (71) and a ring body (72) connected to the top of the surface of the protective tube (2); an arc-shaped notch (73) corresponding to the rod body (62) is provided on the ring body (72); arc-shaped plates (74) are respectively provided in the arc-shaped notches (73); the tops of the arc-shaped plates (74) are respectively connected to the rotating ring (71); a limit opening (75) is provided on one side of the arc-shaped plate (74); when the rotating ring (71) rotates, the limit opening (75) is clamped to the surface of the rod body (62), and the arc-shaped plate (74) is located at the outermost edge of the arc-shaped notch (73); a plurality of universal balls (76) are connected to the bottom of the rotating ring (71) at intervals; the universal balls (76) are respectively in rolling contact with the ring body (72); and a fixing structure (77) is respectively provided between each of the arc-shaped plates (74) and the ring body (72).

4. The oil wellhead with anti-theft structure according to claim 3, characterized in that: The fixing structure (77) comprises a countersunk hole (771) formed on the outer circle of the ring body (72); a through hole (772) matching the countersunk hole (771) is formed on the arc plate (74); a special-shaped bolt (773) is connected to the inner thread of the countersunk hole (771); when the limiting opening (75) is clamped to the surface of the rod body (62), the special-shaped bolt (773) passes through the through hole (772).

5. The oil wellhead with anti-theft structure according to claim 1, characterized in that: The hinged component (53) comprises a hinged head (531) and a hinged seat (532); the hinged seat (532) is connected to the inner wall of the protective tube (2); the hinged head (531) is connected to the triangular cover plate (51); and the hinged head (531) and the hinged seat (532) are connected via a pin shaft.

6. The oil wellhead with anti-theft structure according to claim 1, characterized in that: The bottom of the protective tube (2) is conical.

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