Leakage-proof oil drain valve

Abstract

An anti-leakage oil drain valve comprises an oil drain cylinder, an oil drain hole is formed in the cylinder wall of the oil drain cylinder, an upper connector and a lower connector are installed at the upper end and the lower end of the oil drain cylinder, clamping grooves are formed in the positions, located on the upper side and the lower side of the oil drain hole, of the inner circle face of the oil drain cylinder respectively, an annular sliding sleeve sliding up and down is installed in the oil drain cylinder, and sealing rings are installed on the upper side and the lower side of the outer circle face of the sliding sleeve respectively. Elastic clamping jaws distributed in the circumferential direction are arranged at the upper end and the lower end of the sliding sleeve respectively, an expansion plug is installed in the sliding sleeve, and flexible ripples distributed up and down are arranged on the outer circle face of the expansion plug. The multi-time well repair operation can be met, liquid in the oil pipe is prevented from being brought to the ground in the secondary well repair operation, and the ground environment is prevented from being polluted or blowout is prevented.

Description

Technical Field

[0001] This utility model relates to an oil drain valve used in oilfield production operations, and more particularly to a leak-proof oil drain valve. Background Technology

[0002] When using oil pumps for oil production, well workover operations such as running tubing, pump inspection, and replacing sucker rods are frequently required. During well workover operations, the sucker rod needs to be pulled out of the tubing. This process brings fluid from inside the tubing to the surface, polluting the surface environment and potentially causing a blowout in severe cases. This poses safety hazards to production and operations, resulting in economic losses.

[0003] A drain valve is a device used during well workover operations to drain liquid from the tubing through a drain hole when the sucker rod is pulled out of the tubing, preventing liquid from being carried to the surface. It is also used to seal the drain hole during oil production, allowing for normal oil extraction.

[0004] Traditional drain valves include pull-rod drainers, striker drainers, and lift-and-drop drainers. All of these valves have a rigid sealing structure, requiring destructive conduction to open, meaning they can only be used once. Once the drain channel is open, if oil production continues, the tubing must be pulled out, and a new drain valve and sucker rod must be installed before production can resume. The same well may require multiple wellwork operations depending on usage. During secondary wellwork operations, the aforementioned drain valves still pose a risk of fluid from inside the tubing being carried to the surface, potentially polluting the surface environment or causing a blowout. Summary of the Invention

[0005] The present invention aims to solve the above-mentioned technical problems by providing a leak-proof oil valve that can meet the requirements of multiple well workover operations, preventing the liquid inside the tubing from being brought to the surface during secondary well workover operations, thus preventing pollution of the surface environment or causing a blowout.

[0006] The technical solution of this utility model is:

[0007] A leak-proof oil drain valve includes an oil drain cylinder with an oil drain hole in the cylinder wall. An upper connector and a lower connector are installed at the upper and lower ends of the oil drain cylinder. The valve is characterized by: grooves on the inner circular surface of the oil drain cylinder located on the upper and lower sides of the oil drain hole; an annular sliding sleeve that slides up and down installed inside the oil drain cylinder; sealing rings on the upper and lower sides of the outer circular surface of the sliding sleeve; circumferentially distributed elastic claws at the upper and lower ends of the sliding sleeve; an expansion plug installed inside the sliding sleeve; and flexible corrugations distributed up and down on the outer circular surface of the expansion plug.

[0008] Furthermore, the slot is annular to ensure that all the claws enter the corresponding slot.

[0009] Furthermore, there are two sealing rings on each side to improve the sealing effect.

[0010] Furthermore, the upper and lower connectors are respectively threadedly connected to the oil drain cylinder.

[0011] The beneficial effects of this utility model are:

[0012] The expansion plug is installed at the lower end of the sucker rod. Moving the sucker rod downwards causes the flexible corrugated top of the expansion plug to move against the upper elastic claw, which in turn moves the sliding sleeve downwards. When the drain hole is located between the sealing rings on the upper and lower sides of the outer surface of the sliding sleeve, the drain hole is in a blocked state. Moving the sucker rod upwards causes the flexible corrugated top of the expansion plug to move against the lower elastic claw, which in turn moves the sliding sleeve upwards. The drain hole is located at the position of the lower elastic claw, and the drain hole communicates with the inside of the sliding sleeve through the gap between the lower elastic claws, thus becoming open. This replaces the traditional rigid plugging structure and can be used for multiple well workover operations, preventing fluid from inside the tubing from being brought to the surface during secondary well workover operations, ensuring a safe surface environment and preventing blowouts. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 yes Figure 1 Top view of the flexible chuck;

[0015] In the diagram: 1-oil drain cylinder, 2-oil drain hole, 3-upper connector, 4-lower connector, 5-slot, 6-sliding sleeve, 7-sealing ring, 8-elastic claw, 9-expansion plug, 10-flexible corrugation. Detailed Implementation

[0016] like Figure 1 , Figure 2 As shown, a leak-proof oil drain valve includes an oil drain cylinder 1, an oil drain hole 2 on the cylinder wall of the oil drain cylinder 1, an upper connector 3 and a lower connector 4 respectively installed at the upper and lower ends of the oil drain cylinder 1 by threads, annular grooves 5 respectively on the inner circular surface of the oil drain cylinder 1 located on the upper and lower sides of the oil drain hole 2, annular sliding sleeve 6 that slides up and down installed inside the oil drain cylinder 1, two sealing rings respectively installed on the upper and lower sides of the outer circular surface of the sliding sleeve 6, circumferentially distributed elastic claws 8 at the upper and lower ends of the sliding sleeve 6, an expansion plug 9 installed inside the sliding sleeve 6, and flexible corrugations 10 distributed up and down on the outer circular surface of the expansion plug 9.

[0017] The working principle of this utility model is as follows:

[0018] During installation, the expansion plug 9 is installed on the sucker rod. The sucker rod is moved down, and the flexible corrugations 10 on the expansion plug 9 move down against the sliding sleeve 6. When the elastic claw 8 on the lower side is engaged in the groove 5 on the lower side, the drain hole 2 is located between the sealing rings on the upper and lower sides of the outer surface of the sliding sleeve 6, and the drain hole 2 is in a blocked state. The sucker rod is moved down further, and the flexible corrugations 10 on the expansion plug 9 overcome the friction and pass through the sliding sleeve 6. The distance between the expansion plug 9 and the sliding sleeve 6 is greater than the sucker rod's oil production stroke, and oil production is carried out through the sucker rod.

[0019] During well workover, the sucker rod is moved upwards, and the flexible corrugations 10 on the expansion plug 9 move upwards against the sliding sleeve 6. When the upper elastic claw 8 is engaged in the upper groove 5, the drain hole 2 is located at the position of the lower elastic claw 8 and is connected to the inside of the sliding sleeve 6 through the gap between the lower elastic claws 8. The drain hole 2 is in a conductive state, and the liquid in the tubing is discharged through the drain hole 2. The sucker rod continues to move upwards, and the flexible corrugations 10 on the expansion plug 9 overcome the friction and pass through the sliding sleeve 6 until the sucker rod and expansion plug 9 are pulled out of the tubing, preventing the liquid in the tubing from being brought to the surface.

[0020] The above are merely specific embodiments of this utility model and are not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A leak-proof oil drain valve, comprising an oil drain cylinder, an oil drain hole provided in the cylinder wall, and an upper connector and a lower connector installed at the upper and lower ends of the oil drain cylinder, characterized in that: The inner circular surface of the oil drain cylinder is provided with grooves on the upper and lower sides of the oil drain hole. An annular sliding sleeve that slides up and down is installed inside the oil drain cylinder. Sealing rings are installed on the upper and lower sides of the outer circular surface of the sliding sleeve. Circumferentially distributed elastic claws are provided at the upper and lower ends of the sliding sleeve. An expansion plug is installed inside the sliding sleeve. Flexible corrugations are distributed up and down on the outer circular surface of the expansion plug.

2. The leak-proof oil valve according to claim 1, characterized in that: The slot is ring-shaped.

3. The leak-proof oil valve according to claim 1, characterized in that: There are two sealing rings on each side.

4. The leak-proof oil valve according to claim 1, characterized in that: The upper and lower connectors are respectively threadedly connected to the oil drain cylinder.

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