A blowout preventer box

Abstract

The present invention relates to the technical field of petroleum production, and discloses a blowout preventer box, comprising: a lubricating oil tank, with a refueling port and an installation port on the top, a first packing pressure tube on the bottom, a sealing cover installed on the refueling port, and a sealing mechanism provided in the installation port; a first packing box body is sleeved outside the first packing pressure tube, a first packing base is fixedly connected to the bottom end of the first packing box body, an oil rod hole is provided on the first packing base, the upper end of the packing thread sleeve is threadedly connected to the packing pressure tube, and the lower end is threadedly connected to the first packing box body, and packing filler is filled between the first packing base and the first packing pressure tube in the first packing box body; a pressure detection component is installed on the side wall of the lubricating oil tank, and the blowout preventer box can be used to fully lubricate the oil rod and the packing, with low running resistance and a long service life after one filling, thereby reducing the labor intensity of on-site workers, and can provide early warning of crude oil leakage and self-seal broken rods, thereby facilitating workers' maintenance of oil wells.

Description

Technical Field

[0001] The present invention relates to the technical field of petroleum production, in particular to a blowout prevention box. Background Art

[0002] During oil production, a rod pumping well uses a pumping unit to pump oil through a polished rod, driving the downhole pump to pump well fluid (crude oil, water, and steam) to the surface. During the production process, a blowout preventer (BOP) is installed at the wellhead to seal against the rod and prevent crude oil leakage, isolating the well fluid from the surface environment. During pumping, the BOP directly withstands the impact of the oil flow and the friction of the polished rod, ensuring normal pumping while meeting safety and environmental requirements. When the oilfield enters a high-water-cut phase, the pumped fluid is mostly water, leaving a lack of crude oil lubrication between the rod and packing, resulting in an insufficient oil film. Alternatively, in heavy oil thermal recovery wells, high wellhead temperatures can damage the oil film on the polished rod and increase the friction coefficient. Both of these situations increase friction between the rod and packing, exacerbating packing friction and causing rapid wear, making crude oil leakage more likely. Furthermore, frequent packing replacements and high packing consumption increase the workload of on-site workers.

[0003] In order to solve the above problems, the existing blowout preventer boxes often use multiple sets of packings to seal the oil rods in order to prevent the leakage of crude oil. However, from the current use situation in oil field production, if a blowout preventer box with multiple sets of packings is used, although the packings do not need to be replaced frequently, the friction between the oil rods and the packings is very large, the oil rods are prone to rapid heating, which reduces the service life of the oil rods and is not conducive to the normal operation of the oil pumping unit. When replacing the packings in the blowout preventer box with multiple sets of packings, the blowout preventer box needs to be completely disassembled, which is cumbersome and inconvenient to operate. In addition, the existing blowout preventer box does not have an oil injection warning function. During daily maintenance, the staff can only tighten the blowout preventer box based on past experience, thereby compressing the packing to increase the sealing between the packing and the oil rod to prevent crude oil leakage. The compression packing without reference will also aggravate the wear of the packing. Summary of the Invention

[0004] The present invention proposes a blowout preventer box. By using the blowout preventer box, a lubricating oil tank is provided to fully lubricate the oil rod and the packing, thereby reducing the wear of the packing filler, avoiding the frequent addition and replacement of the packing filler, reducing the labor intensity of on-site workers, and providing early warning of oil well leakage, making it convenient for workers to maintain the oil well, thereby solving the shortcomings of the above-mentioned prior art.

[0005] The technical solution of the present invention is: a blowout prevention box, comprising:

[0006] The lubricating oil tank has a top end with a refueling port and a mounting port, a bottom end with a first packing pressure pipe connected to the lubricating oil tank, a sealing cap installed on the refueling port, a sealing mechanism matched with the sucker rod provided in the mounting port, an outer portion of the first packing pressure pipe is provided with an external thread, and the bottom end of the inner side wall is an inwardly concave arc;

[0007] The blowout prevention component includes: a first packing box body, a first packing base and a packing wire sleeve. The first packing box body is sleeved on the outside of the first packing pressure tube. The first packing base is fixedly connected to the bottom end of the first packing box body. The first packing base is provided with an oil rod hole. The top of the first packing base is provided with an oil rod hole which is concave in shape. The upper end of the packing wire sleeve is threadedly connected to the first packing pressure tube, and the lower end is threadedly connected to the first packing box body. A packing filler pressure detection component is filled between the first packing base and the first packing pressure tube in the first packing box body and is installed on the side wall of the lubricating oil tank.

[0008] Preferably, it also includes a centering component, which includes: a universal ball head, a universal seat cover and a ball head base, the universal ball head is eccentrically fixedly connected to the outer side walls of the first packing box body and the first packing base, the top of the universal seat cover is provided with a first opening that matches the outer side wall of the universal ball head, and the inner side wall is provided with an internal thread, the universal seat cover is sleeved on the universal ball head, and the ball head base includes: a stepped tube and a sealing ring, the outer side wall of the stepped tube is provided with an external thread that matches the internal thread of the universal seat cover, and the sealing ring is arranged at the top of the step in the stepped tube and matches the outer side wall of the universal ball head.

[0009] Preferably, the sealing mechanism comprises: a second packing base, a second packing box body, a second packing pressing tube and a fastening pressure cover, the second packing base is fixedly connected to the mounting opening, the second packing base is provided with an oil rod hole, the second packing base is provided with an oil rod hole which is concave in the arc, the second packing box body is fixedly connected to the top end of the second packing base, and an external thread is provided on the outer wall of the second packing pressing tube, the second packing pressing tube is arranged in the second packing box body, the outer wall of the second packing pressing tube is provided with a clamping ring which is equal to the outer diameter of the second packing box body, the bottom end of the inner wall of the second packing pressing tube is concave in the arc, and the packing filler is filled between the second packing base and the second packing pressing tube in the second packing box body. The top end of the fastening pressure cover is provided with a second opening which is equal to the outer diameter of the second packing pressing tube, the fastening pressure cover is sleeved above the clamping ring on the second packing pressing tube, and its inner wall is provided with an internal thread which matches the external thread of the second packing box body, and the outer wall of the fastening pressure cover is fixedly connected to the rotating sleeve.

[0010] Preferably, a protective cover is fixedly connected to the side wall of the lubricating oil tank, the bottom and right side of the protective cover are open, and the pressure detection component is a pressure gauge, which is installed in the protective cover and threadedly connected to the lubricating oil tank.

[0011] Preferably, the first packing box body is provided with a packing sleeve, the upper end of the packing sleeve is threadedly connected to the packing pressure pipe, the lower end of the packing sleeve is threadedly connected to the first packing box body, and the outer side wall of the packing sleeve is fixedly connected to a rotating sleeve.

[0012] Preferably, a grease pipe communicating with the first packing box body is further provided on the side wall of the first packing box body, and a grease nipple is installed in the grease pipe.

[0013] Preferably, the lubricating oil tank is oval in shape, and a plurality of inverted grooves are engraved on the inner side wall of the first packing box body.

[0014] Preferably, a rotating sleeve is fixedly connected to the outer side wall of the packing wire sleeve and the universal seat pressure cover.

[0015] Preferably, the sealing cover is threadedly connected to the fuel filler port, and a sealing ring is provided between the top of the fuel filler port and the sealing cover.

[0016] Preferably, the lower end of the stepped tube is an oil pipe interface, and the sealing ring is made of nylon or oil-resistant rubber.

[0017] Beneficial effects of the present invention:

[0018] The present invention provides a blowout preventer box. When using the blowout preventer box, after installing the blowout preventer box, lubricating oil is added to the lubricating oil tank, and then the sealing cover is tightly closed. The blowout preventer box is in a working state. When the oil pump is working, the up and down movement of the sucker rod will carry the lubricating oil in the lubricating oil tank to lubricate the packing fillers in the first packing box body and the second packing box body. Compared with traditional blowout preventers, even when used in oil wells developed in a high water cut period or heavy oil thermal recovery wells, the blowout preventer box can fully lubricate the oil rod and the packing fillers through the lubricating oil tank without the lubrication of crude oil, thereby avoiding excessive wear of the packing fillers in the blowout preventer box. Frequent replacement of workers reduces the labor intensity of on-site workers, and the pressure gauge can give early warning of oil spraying during daily use. If the pressure value in the lubricating oil tank is found to change, the lubricating oil tank or the packing wire sleeve can be rotated to compress the packing in the first packing box, thereby achieving a seal between the packing and the sucker rod to prevent oil well leakage. When in use, the staff can use the pressure value of the lubricating oil tank as a reference to determine whether the packing in the blowout preventer box needs to be compressed. Compared with the original experience judgment method, it is more accurate and slows down the wear of the packing in the blowout preventer box. The blowout preventer box can also add grease through the grease nipple, which can quickly and easily lubricate the packing and sucker rod, reducing the wear of the packing. The blowout preventer box is also convenient and quick to add packing. It only needs to loosen and lift the tightening cover or rotate the lubricating oil tank or packing thread sleeve to lift the first packing pressure pipe, so that the packing can be added to the blowout preventer box quickly and easily. The inverted groove set in the first packing box body can prevent the original packing from being withdrawn when adding the packing. The device can also be quickly and easily adjusted using the centering component, and can quickly respond to the situation of the oil rod being offset and tilted. The various components of the device complement each other during use, greatly reducing the maintenance difficulty and labor intensity of the oil well workers, ensuring the normal and safe pumping of the oil well, reducing the consumption of packing, and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the main cross-sectional structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the sealing mechanism of the present invention in a front and cross-sectional view;

[0021] Figure 3 This is a schematic diagram of the front cross-sectional structure of the centering mechanism of the present invention;

[0022] Figure 4 It is a structural schematic diagram of the lower half of the present invention.

[0023] Description of reference numerals:

[0024] 1. Lubricating oil tank; 11. Oil filling port; 111. Sealing cover; 12. Mounting port; 13. First packing pressure tube; 2. Blowout prevention component; 21. First packing box body; 211. Grease tube; 212. Grease nipple; 213. Reverse groove; 22. First packing base; 23. Packing thread sleeve; 3. Sealing mechanism; 31. Second packing base; 32. Second packing box body; 33. Second packing pressure tube; 331. Snap ring; 34. Fastening cover; 4. Packing stuffing; 5. Pressure detection component; 51. Pressure gauge; 52. Protective cover; 6. Aligning component; 61. Universal ball joint; 62. Universal seat cover; 63. Ball joint base; 631. Step pipe; 632. Sealing ring; 7. Rotating sleeve. DETAILED DESCRIPTION

[0025] A specific embodiment of the present invention is described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiment.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the technical solutions of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0027] Combine Figures 1 to 3 As shown, a spray-proof box comprises:

[0028] The lubricating oil tank 1 has a top end with a refueling port 11 and a mounting port 12, and a bottom end with a first packing pressure tube 13 connected to the lubricating oil tank 1. A sealing cap 111 is mounted on the refueling port 11, and a sealing mechanism 3 is provided in the mounting port 12 for cooperating with a sucker rod, wherein the sucker rod is an oil rod or a polished rod. The outer portion of the first packing pressure tube 13 is provided with an external thread, and the bottom end of the inner side wall is an inwardly concave arc.

[0029] The blowout prevention component 2 includes: a first packing box body 21, a first packing base 22 and a packing wire sleeve 23. The first packing box body 21 is sleeved outside the first packing pressure tube 13. The first packing base 22 is fixedly connected to the bottom end of the first packing box body 21. The first packing base 22 is provided with an oil rod hole. The top of the first packing base 22 is provided with an oil rod hole that is concave in the arc. The upper end of the packing wire sleeve 23 is threadedly connected to the first packing pressure tube 13, and the lower end of the packing wire sleeve 23 is threadedly connected to the first packing box body 21. The setting of the packing wire sleeve 23 ensures the sealing of the blowout prevention mechanism 2 and increases the The movement distance of the first packing pressure tube 13 allows more packing 4 to be added to the first packing box body 21; the packing 4 is also called packing. The blowout preventer box uses fibrous packing 4, which only needs to be continuously replenished during the use of the device and does not need to be replaced. Traditional packing 4 requires the original packing 4 to be taken out for replacement. In actual production, a variety of tools for hooking out the packing 4 have been invented, which can easily cause oil spraying and tool injuries when used. The present invention can completely avoid such problems, and the fibrous packing 4 is also extremely convenient to take out during the later well repair.

[0030] When the packing filler 4 needs to be compressed, the packing sleeve 23 can be rotated, and the lubricating oil tank 1 can be rotated to drive the first packing pressure tube 13 to move downward. The packing filler 4 is filled between the first packing base 22 and the first packing pressure tube 13 in the first packing box body 21. The first packing pressure tube 13 and the first packing base 22 have two opposite arc-shaped concave settings. In the initial use, when the first packing pressure tube 13 is rotated downward, the arc-shaped concave can squeeze the packing filler 4, giving the packing filler 4 a force toward the middle oil rod, ensuring that the upper and lower parts of the packing filler 4 are tighter and well sealed with the sucker rod, and the middle position of the packing filler 4 is relatively loose. The friction between the sucker rod and the packing filler 4 mainly lies in the upper and lower parts, which reduces the friction area with the sucker rod and slows down the wear of the packing filler 4. The loose position in the middle of the packing filler 4 is convenient for the penetration of butter when the blowout preventer box is filled with butter, thereby lubricating the packing filler 4, the sucker rod and the polished rod.

[0031] 1 , when the oil pump is running low, the oil pressure in the oil tank 1 will be increased, and the oil pumping machine 1 will be in a state of continuous operation, and the oil pumping machine 1 will be in a state of continuous operation, and the oil pumping machine 1 will be in a state of continuous operation, and the oil pumping machine 1 will be in a state of continuous operation, and the oil pumping machine 1 will be in a state of continuous operation, and the oil pumping machine 1 will be in a state of continuous operation, and the oil pumping machine 1 will be in a state of continuous operation, and the oil pumping machine 1 will be in a state of continuous operation, and the oil pumping machine 1 will be in a state of continuous operation, and the oil pumping machine 1 will be in a state of continuous operation, and the oil pumping machine 1 will be in a state of continuous operation, and the oil pumping machine 1 will be in a state of continuous operation, and the oil pumping machine 1 will be in a state of continuous operation, and the oil pumping machine 1 will be in a state of continuous operation, and the oil pumping machine 1 will be in a state of continuous operation, and the oil pumping machine 1 will be in a state of continuous operation, and the oil pumping machine 1 will be in a state of continuous operation, and the oil pumping machine 1 will be in a state of continuous operation, and the oil pumping machine 1 will be in a state of continuous operation, and the oil pumping machine 1 will be in a state of continuous operation, and the oil pumping machine 1 will be in a state of continuous operation, and the oil pumping machine 1

[0032] Furthermore, it also includes a centering component 6, which includes: a universal ball head 61, a universal seat pressure cover 62 and a ball head base 63. The universal ball head 61 is eccentrically fixedly connected to the outer wall of the first packing box body 21 and the first packing base 22. The top of the universal seat pressure cover 62 is provided with a first opening that matches the outer wall of the universal ball head 61, and an internal thread is provided on the inner wall. The universal seat pressure cover 62 is sleeved on the universal ball head 61. The ball head base 63 includes: a stepped tube 631 and a sealing ring 632. The outer wall of the stepped tube 631 is provided with an external thread that matches the internal thread of the universal seat pressure cover 62. The sealing ring 632 is provided At the top of the step in the stepped tube 631, and in cooperation with the outer wall of the universal ball head 61, a slight deviation may easily occur between the suspension rope of the pumping unit and the center of the wellhead during the operation of the pumping unit. The deviation of the sucker rod is also one of the main reasons for the rapid wear of the packing 4, large consumption, and frequent replacement. During the use of the blowout preventer, if the oil rod tilts, the universal seat pressure cap 62 can be loosened. At this time, the pumping rod will drive the universal ball head 61 and the above components to rotate to achieve centering. After that, the universal seat pressure cap 62 can be tightened to quickly complete the centering work, which can quickly solve the problem of rapid wear of the packing due to the tilt of the pumping rod.

[0033] Furthermore, the sealing mechanism 3 includes: a second packing base 31, a second packing box body 32, a second packing pressure tube 33 and a fastening cover 34. The second packing base 31 is fixedly connected to the installation port 12. The second packing base 31 is provided with an oil rod hole. The oil rod hole on the second packing base 31 is an inwardly concave arc. The second packing box body 32 is welded to the top of the second packing base 31, and an external thread is provided on its outer wall. The second packing pressure tube 33 is provided with a screw thread. In the second packing box body 32, a retaining ring 331 having the same outer diameter as the second packing box body 32 is provided on the outer wall of the second packing pressing tube 33. The bottom end of the inner wall of the second packing pressing tube 33 is an inwardly concave arc. The second packing base 31 and the second packing pressing tube 33 in the second packing box body 32 are filled with packing filler 4. The top of the fastening gland 34 is provided with a second opening having the same outer diameter as the second packing pressing tube 33. The fastening gland 34 is fitted on the retaining ring 33 The outer wall of the fastening cover 34 is fixedly connected to the rotating sleeve 7, and the setting of the sealing mechanism 3 can make the lubricating oil tank 1 partly seal with the sucker rod, and can still ensure the sealing effect of the oil well when the packing filler 4 in the first packing box body 21 is severely worn. The setting of the second packing pressure tube 33 and the fastening cover 34 is convenient for adding the packing filler 4 in the second packing box body 32. It is only necessary to unscrew the fastening pressure cover 34 and move the second packing pressure tube 33 upward to complete the addition of the packing filler. When rotating the fastening pressure cover 34, a rod with a diameter smaller than the rotating sleeve 7 can be used to penetrate into the rotating sleeve 7 to rotate the fastening pressure cover 34. The operation is labor-saving and convenient and quick. The sucker rod can also bring up the lubricating oil in the lubricating oil tank 1 to lubricate the packing filler 4 in the second packing box body 32 during continuous pulling and pulling during work, so as to reduce the wear of the packing filler 4 in this part. Preferably, the fastening cover 34 can be put on the second packing pressure tube 33, and a heat expansion opening is provided above the fastening cover 34 on the second packing pressure tube 33, that is, the top of the fastening cover 34 of the second packing pressure tube 33 is heated, and a chisel or other tool is used to open an outward expansion opening in the second packing pressure tube 33 to prevent the fastening cover 34 and the second packing pressure tube 33 from separating, and to prevent the second packing pressure tube 33 from being lost during actual use and maintenance.

[0034] Furthermore, a protective cover 52 is welded on the side wall of the lubricating oil tank 1, and the bottom and right side of the protective cover 52 are open. The pressure detection component 5 is a pressure gauge 51. The pressure detection component 5 is not unique. The pressure detection component 5 can also use a pressure sensor to be networked, which is convenient for accurate monitoring of multiple blowout preventers at the same time. The use of the pressure gauge 51 in this blowout preventer has low production cost and is more intuitive. When used, the pressure detection component 5 can be arbitrarily selected according to needs. The pressure gauge 51 is installed on the inner thread of the protective cover 52 and is connected to the lubricating oil tank 1. The protective cover 52 can provide protection for the pressure gauge 51 to prevent the pressure gauge 51 from failing in a harsh external working environment. When the packing filler 4 in the first packing box body 21 needs to be compressed, the protective cover 52 is used as a power-assisting handwheel to facilitate the staff to rotate the lubricating oil tank 1.

[0035] Furthermore, a grease tube 211 connected to the first packing box body 21 is provided on the side wall of the first packing box body 21, and a grease nipple 212 is installed in the grease tube 211. The setting of the grease tube 211 is the second lubrication method of the blowout preventer box. During use, a grease gun can be aimed at the grease nipple to inject grease into the first packing box body 21 to lubricate the packing filler in the first packing box body 21 to reduce the wear of the packing filler.

[0036] Furthermore, the lubricating oil tank 1 is oval in shape, and a plurality of reinforcing ribs can be welded inside the lubricating oil tank 1. The oval lubricating oil tank 1 can have a stronger bearing capacity, and prevent the lubricating oil tank 1 from being deformed and damaged during the pumping rod pulling process. The oval lubricating oil tank 1 and the support of the plurality of reinforcing ribs inside make the lubricating oil tank 1 have a higher stability when the blowout preventer is used on a high-pressure oil well. The inner wall of the first packing box body 21 is engraved with a plurality of inverted grooves 213, and the design of the inverted grooves 213 is as follows: The invention is designed to prevent the original packing from exiting the first packing box 21 and spraying oil due to the oil pressure of the oil well when the packing 4 is added to the first packing box 21. The blowout prevention function of the blowout preventer box is also reflected in that if the oil rod breaks, the middle position of the packing 4 in the first packing box 21 is loose. The packing 4 can shrink to the middle position of the inner cavity of the first packing box 21 under the pressure of the oil well to complete the plugging of the oil well, thereby avoiding the accident of oil well leakage when the sucker rod breaks.

[0037] Furthermore, a rotating sleeve 7 is fixedly connected to the outer side walls of the packing sleeve 23 and the universal seat cover 62. When the packing sleeve 23 and the universal seat cover 62 are rotated, a rod with a diameter smaller than the rotating sleeve 7 can be used to penetrate into the rotating sleeve 7 to rotate it. The operation is labor-saving and convenient and fast. In the actual maintenance of the oil well, the staff does not need to carry multiple pipe pliers, and can conveniently and quickly maintain and adjust the blowout preventer box. One staff member can maintain multiple oil wells, reducing labor costs.

[0038] Furthermore, the sealing cover 111 is threadedly connected to the fuel filler port 11, and a sealing ring is provided between the top of the fuel filler port 11 and the sealing cover 111. The setting of the sealing cover 111 and the sealing ring ensures that the lubricating oil tank 1 can be completely in a sealed state, so that the pressure gauge 51 can play an accurate early warning role.

[0039] Furthermore, the lower end of the stepped tube 631 is an oil pipe interface, which is connected to the wellhead when the device is in use. The sealing ring 632 is made of nylon or oil-resistant rubber. The sealing ring 632 provides friction for the universal ball head 61, preventing the universal ball head 61 from rotating during the use of the blowout preventer box, thereby preventing the oil machine's suspension rope from slightly deviating from the center of the wellhead.

[0040] like Figure 4 As shown, in addition, some old oil wells cannot be installed with the entire device due to installation height restrictions. In this case, the lubricating oil tank 1 and the above parts of the present invention can be removed, and the rotating sleeve 7 can be welded on the packing wire sleeve 23.

[0041] It can become an independent product, which is suitable for use in old wells and is most suitable for low-pressure and low-yield wells and intermittent pumping wells. This independent product can also facilitate the addition of packing 4 and quickly complete the centering of the blowout preventer box.

[0042] The working principle and usage of this embodiment:

[0043] When the oil pump is in operation, the up-and-down movement of the sucker rod carries the lubricating oil in the lubricating oil tank to lubricate the packing in the first packing box body and the second packing box body, thereby preventing the packing in the oil pump from wearing out too quickly. During normal work, you can also use a grease gun to aim at the grease nozzle and inject grease into the first packing box body to quickly lubricate the packing and sucker rod in the first packing box body. When it is necessary to add packing to the blowout preventer box, you can loosen and lift the tightening cover or rotate the lubricating oil tank or packing thread sleeve to lift the first packing pressure pipe, so that you can quickly and easily add packing to the blowout preventer box. The guide groove set in the first packing box body can prevent the original packing from withdrawing when adding packing. If the sucker rod is found to be offset and tilted during the use of the blowout preventer box, which causes the packing to wear faster, you can loosen the universal seat cover. At this time, the sucker rod will drive the universal ball head and the above components to rotate to achieve centering. After that, tighten the universal seat cover to quickly complete the centering work.

[0044] The above disclosures are only a few specific embodiments of the present invention, but the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the scope of protection of the present invention.

Claims

1. A blowout prevention box, characterized in that: include: A lubricating oil tank (1) is provided with a refueling port (11) and a mounting port (12) at the top, a first packing pressure pipe (13) connected to the lubricating oil tank (1) at the bottom, a sealing cover (111) is installed on the refueling port (11), a sealing mechanism (3) cooperating with a sucker rod is provided in the mounting port (12), and the bottom end of the inner side wall of the first packing pressure pipe (13) is an inwardly concave arc; The blowout prevention component (2) comprises: a first packing box body (21), a first packing base (22) and a packing thread sleeve (23), wherein the first packing box body (21) is sleeved outside the first packing pressure pipe (13), the first packing base (22) is fixedly connected to the bottom end of the first packing box body (21), an oil rod hole is provided on the first packing base (22), and the oil rod hole at the top end of the first packing base (22) is in the shape of an inward concave arc, the upper end of the packing thread sleeve (23) is threadedly connected to the first packing pressure pipe (13), and the lower end is threadedly connected to the first packing box body (21), and a packing filler (4) is filled between the first packing base (22) and the first packing pressure pipe (13) in the first packing box body (21); A pressure detection component (5) is mounted on a side wall of the lubricating oil tank (1); The sealing mechanism (3) comprises: a second packing base (31), a second packing box body (32), a second packing pressure tube (33) and a fastening cover (34); the second packing base (31) is fixedly connected to the installation port (12); an oil rod hole is provided on the second packing base (31); the oil rod hole provided on the second packing base (31) is in an inwardly concave arc; the second packing box body (32) is fixedly connected to the top end of the second packing base (31); an outer wall thereof is provided with an external thread; the second packing pressure tube (33) is arranged in the second packing box body (32); the outer wall of the second packing pressure tube (33) is provided with a thread connected to the second packing; The second packing box body (32) has a retaining ring (331) with an outer diameter equal to that of the packing box body (32), the bottom end of the inner side wall of the second packing pressing tube (33) is an inwardly concave arc, and the second packing base (31) and the second packing pressing tube (33) in the second packing box body (32) are filled with packing filler (4), the top of the fastening cover (34) is provided with a second opening with an outer diameter equal to that of the second packing pressing tube (33), the fastening cover (34) is sleeved on the upper part of the retaining ring (331) on the second packing pressing tube (33), and the inner side wall thereof is provided with an inner thread matching the outer thread of the second packing box body (32), and the outer side wall of the fastening cover (34) is fixedly connected with a rotating sleeve (7); The lubricating oil tank (1) is elliptical in shape, and a plurality of groups of inverted grooves (213) are engraved on the inner side wall of the first packing box body (21).

2. A blowout prevention box according to claim 1, characterized in that: The centering component (6) further comprises a centering component (6), wherein the centering component (6) comprises a universal ball head (61), a universal seat pressure cover (62) and a ball head base (63), wherein the universal ball head (61) is eccentrically fixedly connected to the outer wall of the first packing box body (21) and the first packing base (22), wherein the top of the universal seat pressure cover (62) is provided with a first opening that matches the outer wall of the universal ball head (61), and the inner wall is provided with an internal thread, and the universal seat pressure cover (62) is sleeved on the universal ball head (61), and the ball head base (63) comprises a stepped tube (631) and a sealing ring (632), wherein the outer wall of the stepped tube (631) is provided with an external thread that matches the internal thread of the universal seat pressure cover (62), and the sealing ring (632) is arranged at the top of the step in the stepped tube (631) and matches the outer wall of the universal ball head (61).

3. A blowout prevention box according to claim 1, characterized in that: A protective cover (52) is fixedly connected to the side wall of the lubricating oil tank (1), and the bottom end and right side of the protective cover (52) are open. The pressure detection component (5) is a pressure gauge (51), and the pressure gauge (51) is installed on the protective cover (52) and is connected to the lubricating oil tank (1) through an internal thread.

4. A blowout prevention box according to claim 1, characterized in that: A grease pipe (211) communicating with the first packing box (21) is further provided on the side wall of the first packing box (21), and a grease nipple (212) is installed in the grease pipe (211).

5. A blowout prevention box according to claim 2, characterized in that: A rotating sleeve (7) is fixedly connected to the outer side walls of the packing wire sleeve (23) and the universal seat pressure cover (62).

6. The blowout prevention box according to claim 1, characterized in that: The sealing cover (111) is threadedly connected to the fuel filling port (11), and a sealing ring is provided between the top end of the fuel filling port (11) and the sealing cover (111).

7. The blowout prevention box according to claim 2, characterized in that: The lower end of the stepped tube (631) is an oil pipe interface, and the sealing ring (632) is made of nylon or oil-resistant rubber.

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