Sealing anti-theft device for oil extraction wellhead

Abstract

The utility model relates to the technical field of oil extraction wellhead theft prevention, in particular to a sealing anti-theft device of an oil extraction wellhead. Comprising a base fixed to a casing head, the casing head penetrates through the base, a right side plate is fixed to the right end of the base, a shell is rotationally connected to the left end of the base, the shell, the right side plate and the base form a sealed box, a Christmas tree is installed at the upper end of the casing head and located in the box, a transverse screw is in threaded connection with the interior of the shell, and one end of the screw extends to the outer side of the shell. A fixing sleeve is fixed to the left end of the right side plate, a screw is connected into the fixing sleeve in a threaded mode, a lock cylinder is fixedly installed on the shell below the screw, a stop lever is fixed to one end of a rotor of the lock cylinder in the box body, and the free end of the stop lever is clamped into an annular groove of the screw. When the stop lever is located in the annular groove of the screw rod, the screw rod cannot rotate and move towards the outer side of the shell, the screw rod cannot be separated from the fixing sleeve, the shell cannot rotate, and the box body can conduct effective anti-theft protection on the Christmas tree.

Description

Technical Field

[0001] The utility model relates to the technical field of anti-theft for oil production wellheads, and particularly relates to a sealing and anti-theft device for oil production wellheads. Background Art

[0002] In the later stage of crude oil production, the water cut of the produced fluid is getting higher and higher. A certain number of oil wells are temporarily sealed every year. Since many oil wells are distributed in remote areas, they are easily stolen. Therefore, an oil production wellhead with good anti-theft effect is needed.

[0003] A patent document with the publication number of CN109356544A discloses a sealing and anti-theft device for an oil production wellhead. When in use, the bottom surface of the cover plate seals the wellhead. The locking parts above each guide rod are screwed down, so as to press the cover plate tightly and it is not easy to loosen. And a support plate is arranged below the cover plate. The locking parts at the bottom of each guide rod are screwed up to abut against the support plate, so that the top surface of the support plate fits with the bottom surface of the cover plate, further enhancing the sealing performance. The protection box is fixed by inserting a ground pile into the base surface position, which has an anti-theft effect and can play a certain sealing effect. Only by inserting the ground pile into the base surface position to fix the protection box, the anti-theft effect is weak.

[0004] The patent document with the authorization announcement number of CN117166954B discloses an anti-theft oil production wellhead device. When opening the anti-theft cap, a construction machine is used to push the anti-theft cap backward. The shear pin is cut off under the action of the shear edge A and the shear edge B. The anti-theft cap moves backward until it stops at the baffle. Then the anti-theft cap is pushed forward until the dovetail groove slider and the dovetail groove guide rail are separated, and then the anti-theft cap can be opened for normal operation. When the anti-theft cap needs to be installed again, a new shear pin needs to be replaced, and it is rather troublesome when the anti-theft cap is installed again. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is a sealing and anti-theft device for an oil production wellhead with good anti-theft effect and capable of being recycled.

[0006] In order to achieve the above object, the technical solution provided by the utility model is:

[0007] A sealing and anti-theft device for an oil production wellhead, comprising a base fixed on a casing head, the casing head penetrating through the base, a right side plate being fixed to the right end of the base, a housing being rotatably connected to the left end of the base, the housing, the right side plate and the base forming a sealed box body, an oil production tree being installed at the upper end of the casing head, the oil production tree being located inside the box body, the lower end of the oil production tree being fixedly communicated with an oil pipe, a horizontal screw rod being threadedly connected inside the housing, one end of the screw rod extending to the outside of the housing, a fixed sleeve being fixed to the left end of the right side plate, the screw rod being threadedly connected inside the fixed sleeve, a lock core being fixedly installed on the housing below the screw rod, one end of the rotor of the lock core inside the box body being fixed with a blocking rod, the length direction of the blocking rod being perpendicular to the axial direction of the lock core, the free end of the blocking rod being clamped in the annular groove of the screw rod, a switch being fixed inside the housing below the blocking rod, the free end of the blocking rod being able to close the switch after the lock core drives the blocking rod to rotate 180 degrees, the switch being electrically connected to a power supply, a controller and a buzzer inside the box body, a distance sensor being fixed on the fixed sleeve, the distance sensor being electrically connected to the controller, and a fixed ring corresponding to the transmitting end of the distance sensor being fixed on the screw rod; it also includes a key cooperating with the lock core, a rotating rod being fixed on the key, the length direction of the rotating rod being perpendicular to the axial direction of the lock core.

[0008] Specifically, the housing includes a left side plate, the screw rod penetrating through the left side plate, the screw rod being threadedly connected to the left side plate, baffles being fixed to both the front and rear ends of the left side plate, and the upper ends of the left side plate and the two baffles being fixedly connected to a top plate.

[0009] Specifically, the lock core is fixed on the left side plate, and the switch is fixed on the left side plate below the screw rod.

[0010] Specifically, the top plate and the baffles are in sealed contact with the right side plate, and the baffles and the left side plate are in sealed contact with the base.

[0011] Specifically, one end of the screw rod outside the housing is concentrically fixed with a turntable, the turntable blocking the lock core, and a minimum gap allowing the key to be inserted into the lock core is provided between the turntable and the lock core.

[0012] Specifically, the controller is wirelessly connected to a control terminal.

[0013] Specifically, a plurality of support blocks are fixed to the lower end of the base, and the lower ends of the support blocks are in contact with the ground.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] 1. This device can use the cooperation of the lock core, the blocking rod and the annular groove on the screw rod to limit the screw rod. When the blocking rod is located in the annular groove of the screw rod, the screw rod cannot rotate and move towards the outside of the housing, the screw rod cannot be separated from the fixed sleeve, the housing cannot rotate, and the box body can effectively protect the oil production tree from theft.

[0016] 2. The turntable blocks the lock core, and there is a minimum gap between the turntable and the lock core to allow the key to be inserted into the lock core. Therefore, it can prevent illegal personnel from using special unlocking tools to rotate the rotor and the blocking rod of the lock core, further improving the anti-theft effect.

[0017] 3. By setting a buzzer, a distance sensor, a switch, a power supply, and a controller, when the rotor of the lock core is rotated by the key and the blocking rod rotates 180 degrees, the blocking rod can close the switch, thereby turning off the buzzer and the distance sensor, and the buzzer will not start when the housing is normally opened.

[0018] 4. When the screw rod is rotated when the switch is not closed, after the distance sensor senses a change in the distance to the fixed ring, the distance sensor can send a signal to the controller, and the controller can send a signal to the control terminal to remind the monitoring personnel that the housing has been illegally opened. At the same time, the buzzer starts and warns the person who illegally opens the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of the device.

[0020] Figure 2 It is a schematic diagram after the housing is opened.

[0021] Figure 3 It is Figure 1 an enlarged view of area A in

[0022] The names of the components in the drawings are: 1. Christmas tree, 2. Casing head, 3. Base, 4. Right side plate, 5. Left side plate, 6. Baffle, 7. Screw rod, 8. Fixed sleeve, 9. Turntable, 10. Ring groove, 11. Lock core, 12. Blocking rod, 13. Key, 14. Rotating rod, 15. Switch, 16. Distance sensor, 17. Fixed ring, 18. Power supply, 19. Controller, 20. Top plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0024] Embodiment 1: Referring to Figures 1 - 3 as shown, a sealing and anti-theft device for an oil production wellhead includes a base 3 fixed on the casing head 2, and the casing head 2 penetrates through the base 3. A plurality of support blocks are fixed at the lower end of the base 3, and the lower ends of the support blocks are in contact with the ground. A right side plate 4 is fixed at the right end of the base 3, and a housing is rotatably connected to the left end of the base 3. The housing, the right side plate 4, and the base 3 form a sealed box body. A Christmas tree 1 is installed at the upper end of the casing head 2, and the Christmas tree 1 is located inside the box body, and the lower end of the Christmas tree 1 is fixedly connected to an oil pipe.

[0025] Since the connection end of the casing head 2 and the Christmas tree 1 is located inside the box, and the entire Christmas tree 1 is located inside the box, it can effectively prevent the bolts connecting the casing head 2 and the Christmas tree 1 and the valve rotors of the Christmas tree 1 from being stolen.

[0026] A horizontal screw rod 7 is threadedly connected inside the housing. One end of the screw rod 7 extends to the outside of the housing. A fixed sleeve 8 is fixed at the left end of the right side plate 4, and the screw rod 7 is threadedly connected inside the fixed sleeve 8. After the screw rod 7 is threadedly connected inside the fixed sleeve 8, the housing is fixedly connected to the right side plate 4.

[0027] A lock core 11 is fixedly installed on the housing below the screw rod 7. One end of the rotor of the lock core 11 inside the box is fixed with a blocking rod 12. The length direction of the blocking rod 12 is perpendicular to the axial direction of the lock core 11, and the free end of the blocking rod 12 is clamped in the annular groove 10 of the screw rod 7.

[0028] A switch 15 is fixed inside the housing below the blocking rod 12. After the lock core 11 drives the blocking rod 12 to rotate 180 degrees, the free end of the blocking rod 12 can close the switch 15. The switch 15 is electrically connected to the power supply 18, the controller 19 and the buzzer inside the box. The controller 19 is wirelessly connected to the control terminal.

[0029] A distance sensor 16 is fixed on the fixed sleeve 8. The distance sensor 16 is electrically connected to the controller 19. A fixed ring 17 corresponding to the transmitting end of the distance sensor 16 is fixed on the screw rod 7.

[0030] It further includes a key 13 that cooperates with the lock core 11. A rotating rod 14 is fixed on the key 13. The length direction of the rotating rod 14 is perpendicular to the axial direction of the lock core 11.

[0031] The housing includes a left side plate 5. The screw rod 7 passes through the left side plate 5, and the screw rod 7 is threadedly connected to the left side plate 5. Baffles 6 are fixed at both the front and rear ends of the left side plate 5. The upper end of the left side plate 5 and the upper ends of the two baffles 6 are fixedly connected to the top plate 20. The lock core 11 is fixed on the left side plate 5, and the switch 15 is fixed on the left side plate 5 below the screw rod 7. The top plate 20 and the baffle 6 are in sealed contact with the right side plate 4, and the baffle 6 and the left side plate 5 are in sealed contact with the base 3.

[0032] When an illegal person forcibly rotates the screw rod 7 and attempts to open the housing, under the cooperation of the blocking rod 12 and the annular groove 10 on the screw rod 7, the screw rod 7 cannot rotate and move outward to the outside of the housing. Therefore, the housing can be prevented from being opened.

[0033] When an illegal person violently rotates the screw rod 7, the switch 15, the power supply 18, the controller 19, the buzzer and the distance sensor 16 form an electrical circuit loop. When the distance sensor 16 senses the movement of the fixed ring 17, the distance sensor 16 sends a signal to the controller 19. The controller 19 activates the buzzer and sends a signal to the control terminal. After the buzzer is activated, it can warn the illegal person. After the controller 19 sends a signal to the control terminal, it can remind the monitoring personnel that the housing has been illegally opened, and can arrange the patrol personnel to patrol the well site in time.

[0034] When the housing is normally opened, the key 13 is inserted into the lock core 11, and then the rotor of the lock core 11 is rotated by using the rotating rod 14 and the key 13. After the blocking rod 12 on the rotor of the lock core 11 rotates 180 degrees, the blocking rod 12 closes the switch 15. At this time, the blocking rod 12 withdraws from the annular groove 10 of the screw rod 7. After the switch 15 is closed, the buzzer and the distance sensor 16 are turned off. Rotate the screw rod 7 to screw the screw rod 7 out of the fixed sleeve 8, and then the housing can be rotated. After the housing is rotated, the Christmas tree 1 is exposed, which is convenient for inspecting or maintaining the Christmas tree 1. When the housing is normally opened, the buzzer will not be activated, and the controller 19 will not send a signal to the control terminal.

[0035] Embodiment 2: On the basis of Embodiment 1, with reference to Figures 1 - 3 As shown, one end of the screw rod 7 outside the housing is concentrically fixed with a turntable 9. The turntable 9 blocks the lock core 11, and there is a minimum gap between the turntable 9 and the lock core 11 that allows the key 13 to be inserted into the lock core 11.

[0036] The turntable 9 blocks the lock core 11, and there is a minimum gap between the turntable 9 and the lock core 11 that allows the key 13 to be inserted into the lock core 11. Therefore, it can prevent illegal persons from using special unlocking tools to rotate the rotor and the blocking rod 12 of the lock core 11, and further improves the anti-theft effect.

[0037] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sealing and anti-theft device for an oil wellhead, comprising a base (3) fixed on a casing head (2), wherein the casing head (2) passes through the base (3), and is characterized in that: A right side plate (4) is fixed to the right end of the base (3), and a shell is rotatably connected to the left end of the base (3). The shell, the right side plate (4) and the base (3) form a sealed box. A Christmas tree (1) is installed on the upper end of the casing head (2). The Christmas tree (1) is located in the box. The lower end of the Christmas tree (1) is fixedly connected to the oil pipe. A transverse screw rod (7) is threadedly connected to the inner thread of the shell. One end of the screw rod (7) extends to the outer side of the shell. A fixed sleeve (8) is fixed to the left end of the right side plate (4). The screw rod (7) is threadedly connected to the fixed sleeve (8). A lock core (11) is fixedly installed on the shell below the screw rod (7). A stop rod (12) is fixed to one end of the rotor of the lock core (11) in the box. The length direction of the stop rod (12) is perpendicular to the axial direction of the lock core (11). The free end of the stop rod (12) is clamped. A switch (15) is fixed in a housing below a stop rod (12) and is connected to a ring groove (10) of a screw rod (7). After the lock cylinder (11) drives the stop rod (12) to rotate 180 degrees, the free end of the stop rod (12) can turn off the switch (15). The switch (15) is electrically connected to a power supply (18), a controller (19) and a buzzer in the housing. A distance sensor (16) is fixed on the fixing sleeve (8). The distance sensor (16) is electrically connected to the controller (19). A fixing ring (17) corresponding to the transmitting end of the distance sensor (16) is fixed on the screw rod (7). The key (13) cooperates with the lock cylinder (11). A rotating rod (14) is fixed on the key (13). The length direction of the rotating rod (14) is perpendicular to the axial direction of the lock cylinder (11).

2. The sealing and anti-theft device for an oil wellhead according to claim 1, characterized in that: The shell comprises a left side plate (5), a screw rod (7) passing through the left side plate (5), the screw rod (7) being threadedly connected to the left side plate (5), baffle plates (6) being fixed at both the front and rear ends of the left side plate (5), and the upper end of the left side plate (5) and the upper ends of the two baffle plates (6) being fixedly connected to the top plate (20).

3. The sealing and anti-theft device for an oil wellhead according to claim 1, characterized in that: The lock core (11) is fixed on the left side plate (5), and the switch (15) is fixed on the left side plate (5) below the screw rod (7).

4. The sealing and anti-theft device for an oil wellhead according to claim 2, characterized in that: The top plate (20) and the baffle plate (6) are in sealing contact with the right side plate (4), and the baffle plate (6) and the left side plate (5) are in sealing contact with the base (3).

5. The sealing and anti-theft device for an oil wellhead according to claim 1, characterized in that: A rotating disk (9) is coaxially fixed to one end of the screw rod (7) outside the housing, the rotating disk (9) blocks the lock cylinder (11), and a minimum gap is provided between the rotating disk (9) and the lock cylinder (11) to allow a key (13) to be inserted into the lock cylinder (11).

6. The sealing and anti-theft device for an oil wellhead according to claim 1, characterized in that: The controller (19) is wirelessly connected to the control terminal.

7. The sealing and anti-theft device for an oil wellhead according to claim 1, characterized in that: A plurality of support blocks are fixed to the lower end of the base (3), and the lower ends of the support blocks are in contact with the ground.

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