Blowout prevention sealing protection device for petroleum wellhead

Abstract

The invention discloses a blowout prevention sealing protection device for a petroleum wellhead, and relates to the technical field of petroleum wellheads. The packing pipe comprises a pipe body, a packing box and a polished rod, and is characterized in that a mounting pipe is communicated between the pipe body and the packing box; two blowout prevention sealing devices are arranged on the outer side of the mounting pipe; the blowout prevention sealing device at the right end comprises a mounting shell fixed to the mounting pipe in a sealed mode. A driving plate is slidably connected into the mounting shell in the transverse direction. The left end of the driving plate penetrates through the outer side of the mounting pipe, and the driving plate is slidably and hermetically connected with the mounting pipe; a semicircular sealing block is fixedly connected in the mounting pipe and at the left end of the driving plate; a sealing gasket corresponding to the polish rod is arranged on the inner side of the sealing block. The pressure relief valve has the beneficial effects that the pressure relief valve can be conveniently adjusted into a pressure relief mode or a blowout prevention mode according to the pressure, use is safer, and the service life is longer.

Description

Technical Field

[0001] The present invention relates to the technical field of oil wellheads, and particularly relates to an oil wellhead blowout prevention and sealing protection device. Background Art

[0002] An oil well is a hole drilled by a drilling method. Generally, after an oil well reaches the oil layer, an oil layer casing is lowered, and oil well cement is injected into the annular space between the casing and the well wall to maintain the well wall and seal the oil, gas, and water layers. Then, according to the requirements of oilfield development, a perforating gun is used to perforate the oil layer to form a channel, a tubing is lowered, and an appropriate flow induction method is used to lift the oil from the bottom of the oil well to the wellhead.

[0003] When the pressure inside the oil wellhead rises, if pressure relief is not carried out in time, a blowout will occur after accumulating to a certain pressure, which is unsafe to use. When the pressure rises too fast, the pipeline needs to be blocked in time to prevent a serious blowout. When the pressure inside the pipeline becomes large, some rubber gaskets bear a large pressure and are prone to failure. Therefore, an oil wellhead blowout prevention and sealing protection device that can solve the above problems is provided. Summary of the Invention

[0004] The technical problem to be solved by the present invention is, in view of the above existing technical deficiencies, to provide an oil wellhead blowout prevention and sealing protection device. This structure is convenient to adjust to a pressure relief mode or a blowout prevention mode according to the pressure size, is safer to use, and has a longer service life.

[0005] The technical solution adopted by the present invention is: to provide an oil wellhead blowout prevention and sealing protection device, including a pipe body, a stuffing box, and a polished rod, characterized in that: an installation pipe is connected between the pipe body and the stuffing box; two blowout prevention and sealing devices are arranged on the outer side of the installation pipe; the blowout prevention and sealing device at the right end includes an installation shell that is hermetically fixed to the installation pipe; a driving plate is slidably connected horizontally inside the installation shell; the left end of the driving plate penetrates the outer side of the installation pipe, and the driving plate is slidably and hermetically connected to the installation pipe; inside the installation pipe, a semi-circular sealing block is fixedly connected to the left end of the driving plate; a sealing gasket corresponding to the polished rod is arranged inside the sealing block; at the sealing block, a through hole communicating with the installation shell is opened on the installation pipe; at the through hole, an inner sealing strip is fixedly connected to the outer side of the sealing block; an inner sealing groove for clamping and sealing with the inner sealing strip is opened on the inner side of the installation pipe; inside the installation shell, a sealing plate corresponding to the through hole is fixedly connected to the lower end of the driving plate; an outer sealing strip is fixedly connected to the inner side of the sealing plate; an outer sealing groove for clamping and sealing with the outer sealing strip is opened on the outer side of the installation pipe; a threaded rod is rotatably connected inside the installation shell, and the left end of the threaded rod is threadedly connected to the driving plate; a pressure relief port is opened at the lower end of the installation shell; the blowout prevention and sealing device at the left end is symmetrical to the blowout prevention and sealing device at the right end and has the same structure; a pressure detection device is arranged on the installation pipe.

[0006] To further optimize this technical solution, the sealing blocks of an oil wellhead blowout prevention and sealing protection device are all inverted conical; sealing grooves that are hermetically fitted to the outer sides of the sealing blocks are provided in the installation pipes; the sealing blocks are all made of metal; the sealing gaskets are all made of rubber.

[0007] To further optimize this technical solution, the number of threaded rods in each installation shell of an oil wellhead blowout prevention and sealing protection device is two. The two threaded rods are respectively threadedly connected to the driving plate and the sealing plate, and the helix directions of the two threaded rods are different; the two threaded rods are both rotatably connected to the installation shell; inside the installation shell, gears are fixedly connected to the outer sides of the two threaded rods, and the two gears mesh with each other; driving motors are installed on the outer sides of the installation shells; the output ends of the driving motors are fixedly connected to the upper threaded rods.

[0008] To further optimize this technical solution, the lower ends of the inner sides of the installation shells of an oil wellhead blowout prevention and sealing protection device are all hermetically and slidably connected transversely with adjusting plates; adjusting holes corresponding to the pressure relief ports are provided on the adjusting plates; the adjusting plates are all fixedly connected to the sealing plates; thickening plates are fixedly connected to the adjusting plates.

[0009] To further optimize this technical solution, the pressure detection device of an oil wellhead blowout prevention and sealing protection device includes a detection pipe communicated with the installation pipe; a piston is slidably connected in the detection pipe; a spring is fixedly connected to the right end of the piston; the other end of the spring is fixedly connected to the detection pipe; a scale rod is fixedly connected to the right end of the piston; the right end of the scale rod penetrates the detection pipe, and the scale rod is slidably connected to the detection pipe.

[0010] To further optimize this technical solution, the right end of the detection pipe of an oil wellhead blowout prevention and sealing protection device is communicated with a transparent observation pipe; two capacitor plates are fixedly connected in the observation pipe; the scale rod slidably fits with the two plates.

[0011] To further optimize this technical solution, the number of outer sealing strips of an oil wellhead blowout prevention and sealing protection device is at least two.

[0012] To further optimize this technical solution, the inner sides of the sealing plates of an oil wellhead blowout prevention and sealing protection device are all hermetically fitted to the outer sides of the installation pipes.

[0013] To further optimize this technical solution, an oil outlet pipe is provided on the pipe body of an oil wellhead blowout prevention and sealing protection device; an electromagnetic valve is provided on the oil outlet pipe.

[0014] Compared with the traditional oil wellhead blowout prevention and sealing protection device, the beneficial effects of the present invention are as follows:

[0015] 1. The cooperation of the pipe body, pressure detection device, drive motor, threaded rod, gear, driving plate, sealing plate, sealing block, through hole, and installation shell relieves pressure through the pressure relief port to prevent excessive pressure in the pipe body and ultimately lead to dangers such as blowouts; the sealing block is set in an inverted conical shape and made of metal, and most of the pressure will reach the through hole through the hard sealing block, with a longer service life;

[0016] 2. The settings of the pipe body, drive motor, threaded rod, sealing plate, sealing block, driving plate, through hole, sealing gasket, polished rod, stuffing box, and installation shell further prevent blowouts, prevent the oil from spraying out, or delay the spraying speed of the oil, making it safer to use;

[0017] 3. The settings of the inner sealing strip, inner sealing groove, outer sealing strip, and outer sealing groove can provide better sealing; the settings of the sealing plate, through hole, sealing block, adjusting plate, and pressure relief port enable the driving plate and adjusting plate to move simultaneously for corresponding pressure relief and sealing, and the thickened plate further strengthens and reinforces the sealing of the pressure relief port;

[0018] 4. The settings of the detection pipe, piston, spring, and scale rod facilitate understanding the pressure in the pipe body; the cooperation of the scale rod and the electrode plate measures the pressure in the pipe body according to the capacitor, and then controls the drive motor to relieve pressure or seal according to the pressure magnitude, making it more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the present invention;

[0020] Figure 2 is a schematic structural diagram of another perspective of the present invention;

[0021] Figure 3 is a schematic structural diagram of the interior of the installation shell of the present invention;

[0022] Figure 4 is a schematic structural diagram of another perspective of the interior of the installation shell of the present invention;

[0023] Figure 5 is a schematic structural diagram of the first structure inside the installation shell of the present invention;

[0024] Figure 6 is a schematic structural diagram of the second structure inside the installation shell of the present invention;

[0025] Figure 7 is a schematic structural diagram of the third structure inside the installation shell of the present invention;

[0026] Figure 8 is a schematic structural diagram of the detection pipe part of the present invention;

[0027] Figure 9 is a schematic structural diagram of the adjusting plate part of the present invention;

[0028] In the figure, 1 is the pipe body; 2 is the packing box; 3 is the polished rod; 4 is the installation pipe; 5 is the installation shell; 6 is the driving plate; 7 is the sealing block; 8 is the sealing gasket; 9 is the through hole; 10 is the inner sealing strip; 11 is the inner sealing groove; 12 is the sealing plate; 13 is the outer sealing strip; 14 is the outer sealing groove; 15 is the threaded rod; 16 is the pressure relief port; 17 is the sealing groove; 18 is the gear; 19 is the driving motor; 20 is the adjusting plate; 21 is the adjusting hole; 22 is the thickened plate; 23 is the detection pipe; 24 is the piston; 25 is the spring; 26 is the scale rod; 27 is the observation pipe; 28 is the electrode plate; 29 is the oil outlet pipe; 30 is the solenoid valve. Detailed implementation mode

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and the detailed implementation mode.

[0030] As Figures 1-9As shown in the figure, an oil wellhead blowout prevention and sealing protection device includes a pipe body 1, a stuffing box 2 and a polished rod 3, and is characterized in that: an installation pipe 4 is communicated between the pipe body 1 and the stuffing box 2; two blowout prevention and sealing devices are arranged on the outer side of the installation pipe 4; the blowout prevention and sealing device at the right end includes an installation shell 5 which is hermetically fixed to the installation pipe 4; a driving plate 6 is slidably connected horizontally in the installation shell 5; the left end of the driving plate 6 penetrates through the outer side of the installation pipe 4, and the driving plate 6 is slidably and hermetically connected to the installation pipe 4; inside the installation pipe 4, a semi-circular sealing block 7 is fixedly connected to the left end of the driving plate 6; a sealing pad 8 corresponding to the polished rod 3 is arranged inside the sealing block 7; at the sealing block 7, a through hole 9 communicating with the installation shell 5 is opened on the installation pipe 4; at the through hole 9, an inner sealing strip 10 is fixedly connected to the outer side of the sealing block 7; an inner sealing groove 11 for clamping and sealing with the inner sealing strip 10 is opened on the inner side of the installation pipe 4; inside the installation shell 5, a sealing plate 12 corresponding to the through hole 9 is fixedly connected to the lower end of the driving plate 6; an outer sealing strip 13 is fixedly connected to the inner side of the sealing plate 12; an outer sealing groove 14 for clamping and sealing with the outer sealing strip 13 is opened on the outer side of the installation pipe 4; a threaded rod 15 is rotatably connected inside the installation shell 5, and the left end of the threaded rod 15 is threadedly connected to the driving plate 6; a pressure relief port 16 is opened at the lower end of the installation shell 5; the blowout prevention and sealing device at the left end and the blowout prevention and sealing device at the right end are symmetrical left and right and have the same structure; a pressure detection device is arranged on the installation pipe 4; the sealing blocks 7 are all inverted conical; sealing grooves 17 for hermetically fitting with the outer sides of the sealing blocks 7 are opened inside the installation pipes 4; the sealing blocks 7 are all made of metal; the sealing pads 8 are all made of rubber; the number of the threaded rods 15 in each installation shell 5 is two, the two threaded rods 15 are respectively threadedly connected to the driving plate 6 and the sealing plate 12, and the rotation directions of the two threaded rods 15 are different; the two threaded rods 15 are both rotatably connected to the installation shell 5; inside the installation shell 5, gears 18 are fixedly connected to the outer sides of the two threaded rods 15, and the two gears 18 are meshed with each other; driving motors 19 are installed on the outer sides of the installation shells 5; the output ends of the driving motors 19 are fixedly connected to the upper threaded rods 15; adjusting plates 20 are hermetically and slidably connected horizontally to the lower ends inside the installation shells 5; adjusting holes 21 corresponding to the pressure relief ports 16 are opened on the adjusting plates 20; the adjusting plates 20 are all fixedly connected to the sealing plates 12; thickening plates 22 are fixedly connected to the adjusting plates 20; the pressure detection device includes a detection pipe 23 communicated with the installation pipe 4; a piston 24 is slidably connected inside the detection pipe 23; a spring 25 is fixedly connected to the right end of the piston 24; the other end of the spring 25 is fixedly connected to the detection pipe 23; a scale rod 26 is fixedly connected to the right end of the piston 24; the right end of the scale rod 26 penetrates through the detection pipe 23, and the scale rod 26 is slidably connected to the detection pipe 23; a transparent observation pipe 27 is communicated with the right end of the detection pipe 23; two capacitor plates 28 are fixedly connected inside the observation pipe 27; the scale rod 26 is slidably attached to the two capacitor plates 28; the number of the outer sealing strips 13 is at least two; the inner sides of the sealing plates 12 are all hermetically attached to the outer side of the installation pipe 4; an oil outlet pipe 29 is arranged on the pipe body 1; an electromagnetic valve 30 is arranged on the oil outlet pipe 29.

[0031] During use, when a blowout occurs, the pressure inside the pipe body 1 increases. As a result, the pressure detection device detects a large pressure, and the pressure detection device controls the driving motor 19 to rotate. The driving motor 19 drives the threaded rod 15 fixedly connected thereto to rotate. Through two meshing gears 18, the two threaded rods 15 rotate simultaneously. According to the meshing of the two gears 18, the rotation directions of the two threaded rods 15 are different, and the helix directions of the two threaded rods 15 are different. Although the rotation directions of the two threaded rods 15 are different, they will simultaneously drive the driving plate 6 and the sealing plate 12 threadedly connected thereto to move. The sealing plate 12 drives, and the driving plate 6 drives the sealing block 7 to move towards the polished rod 3. At this time, as Figure 6 shown, the pressure passes through the gap between the sealing block 7 and the mounting pipe 4, then through the through hole 9, and then through the gap between the sealing plate 12 and the mounting pipe 4 to reach the inside of the mounting shell 5, and is relieved through the pressure relief port 16 to prevent the pressure inside the pipe body 1 from being too large and ultimately causing dangers such as blowouts;

[0032] The sealing block 7 is provided in an inverted conical shape, and a large area of pressure will pass through the sealing block 7 to reach the through hole 9 for pressure relief. Since the sealing block 7 is made of a hard metal material, it can withstand greater pressure. The sealing gasket 8 is thinner, the pressure-bearing area is smaller, and it is not easily deformed. When the pressure is too large for pressure relief, most of the pressure will pass through the hard sealing block 7 to reach the through hole 9, and the service life is longer;

[0033] When it is detected that the pressure inside the pipe body 1 is too large and difficult to relieve, the driving motor 19 is started at this time. The driving motor 19 drives the two threaded rods 15 to rotate, and finally drives the sealing plate 12, the sealing block 7 and the driving plate 6 to move to as Figure 7 shown. The sealing plate 12 seals and blocks the through hole 9. At the same time, the sealing block 7 and the sealing gasket 8 fit and block the polished rod 3 to prevent the oil from spraying out, or delay the spraying speed of the oil, increasing the time for personnel to escape, and making it safer to use. When the oil pressure is too large, even if the oil passes through the polished rod 3 and the sealing gasket 8, there is still the stuffing box 2 for further blowout prevention. And when the oil passes through the through hole 9 and the sealing plate 12, there is still the mounting shell 5 for further blowout prevention, preventing the oil from spraying out, or delaying the spraying speed of the oil, making it safer to use;

[0034] The setting of the inner sealing strip 10 and the inner sealing groove 11 facilitates better sealing. When there are two outer sealing strips 13 and outer sealing grooves 14, as Figure 6 shown, better sealing can be achieved. When the sealing plate 12 moves, as Figure 5 shown, at this time, the through hole 9 and the sealing block 7 are sealed, and at the same time, the adjusting plate 20 blocks the pressure relief port 16. When the sealing plate 12 moves to as Figure 6 shown, at this time, the through hole 9 is communicated for pressure relief, and at the same time, the adjusting hole 21 on the adjusting plate 20 is communicated with the pressure relief port 16 for pressure relief, facilitating movement to asFigure 7 When shown as such, the through hole 9 is sealed with the sealing plate 12. At the same time, the adjusting plate 20 and the thickening plate 22 block the pressure relief port 16. The thickening plate 22 further strengthens and seals the pressure relief port 16, which is convenient for driving the moving plate 6 to move and at the same time moving the adjusting plate 20 for corresponding pressure relief and sealing;

[0035] With the arrangement of the detection tube 23, when the pressure increases, the piston 24 will move, so that the spring 25 contracts, and then the scale rod 26 moves, which is convenient to observe the extended distance of the scale rod 26 to understand the pressure in the pipe body 1; when the scale rod 26 extends, it will move on the two electrode plates 28. The contact area between the scale rod 26 and the electrode plates 28 changes, and the signal of the capacitor changes, so as to know the extended distance of the scale rod 26. The longer the extended distance of the scale rod 26, the greater the pressure. According to the extended distance measured by the capacitor, the pressure in the pipe body 1 can be known. Finally, the driving motor 19 is controlled according to the pressure magnitude to drive the sealing plate 12, the sealing block 7 and the driving plate 6 to relieve pressure or seal, which is more convenient to use;

[0036] When the packing box 2 needs to be replaced, it can also be done after the sealing block 7, the sealing gasket 8 and the polished rod 3 are fitted together.

[0037] It should be understood that the above specific embodiments of the present invention are only used for exemplary illustration or explanation of the principle of the present invention, and do not constitute a limitation to the present invention. Therefore, any modifications, equivalent replacements, improvements, etc. made without departing from the spirit and scope of the present invention shall be included within the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modification examples falling within the scope and boundary of the appended claims, or equivalent forms of such scope and boundary.

Claims

1. A petroleum wellhead blowout prevention seal protection device, comprising a pipe body (1), a packing box (2) and a polished rod (3), characterized in that: A mounting pipe (4) is connected between the pipe body (1) and the packing box (2); two anti-blowout sealing devices are arranged on the outside of the mounting pipe (4); The anti-blowout sealing device at the right end comprises a mounting shell (5) sealed and fixed with the mounting tube (4); a driving plate (6) is slidably connected in the mounting shell (5) in a transverse direction; the left end of the driving plate (6) penetrates the outside of the mounting tube (4), and the driving plate (6) is slidably and sealedly connected with the mounting tube (4); a semicircular sealing block (7) is fixedly connected to the left end of the driving plate (6) in the mounting tube (4); a sealing gasket (8) corresponding to the light rod (3) is arranged on the inner side of the sealing block (7); a through hole (9) communicating with the mounting shell (5) is opened on the mounting tube (4) at the sealing block (7); an inner sealing strip (10) is fixedly connected to the outer side of the sealing block (7) at the through hole (9); An inner sealing groove (11) is provided on the inner side of the mounting tube (4) and is clamped and sealed with the inner sealing strip (10); a sealing plate (12) corresponding to the through hole (9) is fixedly connected to the lower end of the driving plate (6) in the mounting shell (5); an outer sealing strip (13) is fixedly connected to the inner side of the sealing plate (12); an outer sealing groove (14) is provided on the outer side of the mounting tube (4) and is clamped and sealed with the outer sealing strip (13); a threaded rod (15) is rotatably connected in the mounting shell (5), and the left end of the threaded rod (15) is threadedly connected to the driving plate (6); a pressure relief port (16) is provided at the lower end of the mounting shell (5); the anti-blowout sealing device at the left end and the anti-blowout sealing device at the right end are symmetrical and have the same structure; A pressure detection device is provided on the mounting pipe (4).

2. The oil wellhead blowout prevention seal protection device according to claim 1, characterized in that: The sealing blocks (7) are all in the shape of an inverted cone; the mounting tubes (4) are all provided with sealing grooves (17) which are in sealing contact with the outer sides of the sealing blocks (7); the sealing blocks (7) are all made of metal; and the sealing pads (8) are all made of rubber.

3. The oil wellhead blowout prevention seal protection device according to claim 1, characterized in that: There are two threaded rods (15) in each mounting shell (5), and the two threaded rods (15) are respectively threadedly connected to the driving plate (6) and the sealing plate (12), and the two threaded rods (15) have different rotation directions; the two threaded rods (15) are both rotatably connected to the mounting shell (5); inside the mounting shell (5), the outer sides of the two threaded rods (15) are fixedly connected with gears (18), and the two gears (18) are meshed with each other; the outer sides of the mounting shells (5) are each installed with a driving motor (19); the output end of the driving motor (19) is fixedly connected to the upper end of the threaded rod (15).

4. The oil wellhead blowout prevention seal protection device according to claim 1, characterized in that: The lower inner end of the mounting shell (5) is slidably connected with an adjustment plate (20) along a transverse sealing manner; the adjustment plate (20) is provided with an adjustment hole (21) corresponding to the pressure relief port (16); the adjustment plate (20) is fixedly connected to the sealing plate (12); and a thickening plate (22) is fixedly connected to the adjustment plate (20).

5. The oil wellhead blowout prevention seal protection device according to claim 1, characterized in that: The pressure detection device comprises a detection tube (23) connected to a mounting tube (4); a piston (24) is slidably connected inside the detection tube (23); a spring (25) is fixedly connected to the right end of the piston (24); the other end of the spring (25) is fixedly connected to the detection tube (23); a scale rod (26) is fixedly connected to the right end of the piston (24); the right end of the scale rod (26) penetrates the detection tube (23), and the scale rod (26) is slidably connected to the detection tube (23).

6. The oil wellhead blowout prevention seal protection device according to claim 5, characterized in that: The right end of the detection tube (23) is connected to a transparent observation tube (27); two capacitor plates (28) are fixedly connected inside the observation tube (27); and the scale rod (26) is slidably fitted with the two plates (28).

7. The oil wellhead blowout prevention seal protection device according to claim 1, characterized in that: The number of the outer sealing strips (13) is at least two.

8. The oil wellhead blowout prevention seal protection device according to claim 1, characterized in that: The inner side of the sealing plate (12) is in sealing contact with the outer side of the mounting tube (4).

9. The oil wellhead blowout prevention seal protection device according to claim 1, characterized in that: An oil outlet pipe (29) is arranged on the pipe body (1); and an electromagnetic valve (30) is arranged on the oil outlet pipe (29).

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