Valve changing device for replacing flange on natural gas production tree

Abstract

The utility model discloses a valve changing device for replacing the flange on a natural gas production tree, and belongs to the technical field of valve changing devices. The valve changing device includes a mounting mechanism, a plug and a secondary pressurizing mechanism. The mounting mechanism is provided with a telescopic mechanism, the output shaft of the telescopic mechanism is movably connected with the plug, and the secondary pressurizing mechanism is used to fix the plug; it also includes a blowout preventer, which is installed at the lower end of the outer wall of the telescopic mechanism; the secondary pressurizing mechanism includes a pressing plate, a hole matching the plug is opened on the pressing plate, and fixing holes are opened at both ends of the pressing plate. The utility model sends the plug to the specified position of the oil pipe hanger through the telescopic mechanism to cut off the airflow in the well and prevent gas leakage in the well when replacing the flange and valve on the wellhead. The blowout preventer is used to achieve a sealed connection between the flange and the outer wall of the telescopic mechanism, and when the plug is sent into the well, gas leakage is prevented. A certain pressure is applied to the plug through the secondary pressurizing mechanism to prevent the plug from shifting.

Description

Technical Field

[0001] The utility model relates to the technical field of valve changers, and more specifically to a valve changer for replacing a flange on a natural gas production tree. Background Art

[0002] The Christmas tree is an important device used to control and regulate natural gas production during natural gas extraction. It is usually installed at the wellhead and controls and regulates natural gas production through a series of valves, manifolds and control systems. It can control the flow and pressure of natural gas by opening or closing valves to meet production needs. At the same time, the Christmas tree can also prevent blowouts, ensure production safety, and ensure the stability and continuity of natural gas production.

[0003] After decades of exploitation, the gas production tree at the wellhead of the oil field has different degrees of leakage in the main control components of the wellhead device due to erosion, corrosion or aging of valve seal flanges. Gate valve leakage is very detrimental to the safe production of gas wells, and natural gas contains a lot of harmful gases. These harmful gases not only seriously threaten people's health, but also cause environmental pollution, and also cause serious corrosion damage to metal equipment and tools. Once the wellhead is out of control, the consequences will be unimaginable, which may cause fires, explosions and personal injury accidents, so it is necessary to replace the gate valve and related flanges of the leaking gas production tree in time. When replacing the leaking gate valve, how to cut off the airflow in the well and prevent the airflow from leaking out is an urgent problem to be solved. Therefore, we propose a valve replacement device for replacing the flange on the natural gas gas production tree. Utility Model Content

[0004] The utility model aims to provide a valve changing device for replacing a flange on a natural gas production tree, so as to solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A valve changing device for replacing a flange on a natural gas production tree comprises a mounting mechanism, a plug and a secondary pressurizing mechanism. The mounting mechanism is provided with a telescopic mechanism, the output shaft of the telescopic mechanism is movably connected with the plug, and the secondary pressurizing mechanism is used to fix the plug;

[0007] It also includes a blowout preventer, which is installed at the lower end of the outer wall of the telescopic mechanism;

[0008] The secondary pressurizing mechanism comprises a pressing plate, a hole cooperating with the plugging device is provided on the pressing plate, and fixing holes are provided at both ends of the pressing plate.

[0009] Preferably, the mounting mechanism comprises an upper bracket, support members are provided on both sides below the upper bracket, the telescopic mechanism is located between the two support members, and the end of the telescopic mechanism can cooperate with the plug.

[0010] Preferably, a joint is provided at the upper end of the telescopic mechanism, the joint passes through the upper bracket, and a sealing ring A is provided between the joint and the telescopic mechanism.

[0011] Preferably, a sealing ring B is provided between the inner side of the upper end of the lubricating pipe and the outer wall of the telescopic mechanism, and a sealing ring C is sleeved on the lower end of the lubricating pipe.

[0012] Preferably, a sealing gasket is also sleeved on the lower end of the blowout preventer, and the sealing ring C is located above the sealing gasket.

[0013] Preferably, the telescopic mechanism is a hydraulic cylinder, the upper end of the blowout preventer is connected to the outer wall of the lower end of the hydraulic cylinder, and the piston rod of the hydraulic cylinder is clearance-matched with the blowout preventer.

[0014] Preferably, it also includes a connecting tube, the upper end of which extends into the hydraulic cylinder housing, and the lower end of which extends into the blowout preventer, and the connecting tube is sealed and connected to the hydraulic cylinder housing and the blowout preventer respectively.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] The utility model sends the plug to the specified position of the oil pipe hanger through the telescopic mechanism, cuts off the airflow in the well, and prevents gas leakage in the well when the flange and valve on the wellhead are replaced. The blowout preventer is provided to achieve a sealed connection between the flange and the outer wall of the telescopic mechanism, and prevents gas leakage when the plug is sent into the well. The secondary pressurizing mechanism is provided, and when the flange on the wellhead is lifted up a certain distance, a certain pressure is applied to the plug through the secondary pressurizing mechanism to prevent the plug from shifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is a side sectional schematic diagram of the overall structure of the utility model;

[0019] Figure 3 This is a top view schematic diagram of the secondary pressurizing mechanism of the utility model installed above the connecting plate;

[0020] Figure 4 It is a schematic diagram of the cross-sectional structure of the blowout preventer of the utility model.

[0021] Explanation of the numbers in the figure: 1. Joint; 2. Upper bracket; 3. Telescopic mechanism; 4. Support; 5. Secondary pressurization mechanism; 6. Blowout preventer; 7. Sealing gasket; 8. Sealing ring A; 9. Sealing ring B; 10. Sealing ring C; 11. Plug; 12. Connecting tube; 13. Connecting plate; 14. Screw; 15. Flange; 16. Stud; 17. Nut; 18. Wellhead valve; 19. Wellhead upper flange. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] Example:

[0024] See also Figure 1-4 , a valve changing device for replacing the flange on a natural gas production tree, comprising a mounting mechanism, a plug 11 and a secondary pressurizing mechanism 5, wherein a telescopic mechanism 3 is arranged on the mounting mechanism, and an output shaft of the telescopic mechanism 3 is movably connected with the plug 11, and the telescopic mechanism 3 is used to send the plug 11 to a designated position of the oil pipe hanger, and the secondary pressurizing mechanism 5 is used to fix the plug 11, and when the upper flange is lifted up a certain distance, the secondary pressurizing mechanism 5 is added to fix the plug 11 to prevent the plug 11 from shifting;

[0025] It also includes a lubricant preventer 6, which is installed at the lower end of the outer wall of the telescopic mechanism 3. The lubricant preventer 6 is used to achieve a sealed connection between the flange 15 and the outer wall of the telescopic mechanism 3 to prevent gas leakage when the plug 11 is sent into the well;

[0026] The secondary pressurizing mechanism 5 includes a pressure plate, which has a hole that cooperates with the plug 11, and fixing holes at both ends of the pressure plate. The pressure plate is connected to the connecting plate 13 by bolts passing through the fixing holes, so that the pressure plate applies a certain pressure to the plug 11 to prevent the plug 11 from shifting.

[0027] In a possible embodiment, two pressure plates are provided, and semicircular holes cooperating with the plug 11 are provided on the two pressure plates opposite to each other. The two pressure plates can be flexibly connected to form an integrated structure, and the semicircular holes can contact the steps of the outer wall of the plug 11. The diameter of the semicircular holes is smaller than the diameter of the steps of the outer wall of the plug 11. The two pressure plates apply downward pressure to the steps of the outer wall of the plug 11 to prevent the plug 11 from shifting. By providing two flexibly connected pressure plates with semicircular holes, it is convenient to move a certain distance on the wellhead flange 19, and the secondary pressurizing mechanism 5 can be quickly installed. Semicircular mounting holes are provided at the ends of the two pressure plates. After the two pressure plates are connected as one, a completed bolt hole is formed at the ends, wherein the two pressure plate ends can be fixed as one by snap fasteners. After the two pressure plates are connected as one, the ends can be connected to the connecting plate 13 by bolts.

[0028] In the present application, the installation mechanism includes an upper bracket 2, and support members 4 are arranged on both sides below the upper bracket 2. The telescopic mechanism 3 is located between the two support members 4, and the end of the telescopic mechanism 3 can cooperate with the plug 11. The lower end of the support member 4 is connected to the connecting plate 13, and the upper end of the support member 4 is installed on the upper bracket 2. The plug 11 is sent to the specified position of the tubing hanger by using the telescopic mechanism 3, and the plug 11 is pressurized and sealed by the telescopic mechanism 3 to achieve the purpose of isolating the airflow in the well.

[0029] In the present application, a joint 1 is provided at the upper end of the telescopic mechanism 3, and the joint 1 passes through the upper bracket 2. The joint 1 is used to install the telescopic mechanism 3 on the upper bracket 2. A sealing ring A8 is provided between the joint 1 and the telescopic mechanism 3, and the sealing ring A8 is used to achieve a sealed connection between the joint 1 and the telescopic mechanism 3.

[0030] In the present application, a sealing ring B9 is provided between the inner side of the upper end of the lubricating pipe 6 and the outer wall of the telescopic mechanism 3 , and a sealing ring C10 is sleeved on the lower end of the lubricating pipe 6 .

[0031] In the present application, a sealing gasket 7 is also sleeved on the lower end of the lubricator 6, and a sealing ring C10 is located above the sealing gasket 7. Through the setting of the sealing ring C10 and the sealing gasket 7, a sealed connection between the lower end of the lubricator 6 and the flange 15 is achieved. The lubricator 6 and the flange 15 are connected by studs 16 and fixed by nuts 17.

[0032] In the present application, the telescopic mechanism 3 is a hydraulic cylinder, the upper end of the blowout preventer 6 is connected to the outer wall of the lower end of the hydraulic cylinder, and the piston rod of the hydraulic cylinder is clearance-matched with the blowout preventer 6 .

[0033] A connecting tube 12 is provided at the lower end of the hydraulic cylinder, the upper end of the connecting tube 12 extends into the hydraulic cylinder housing, the lower end of the connecting tube 12 extends between the blowout preventer 6 and the piston rod, the connecting tube 12 is sealedly connected to the inner wall of the hydraulic cylinder housing and the inner wall of the blowout preventer 6 respectively, and the piston rod is slidably matched with the inner wall of the connecting tube 12. A protrusion is provided on the outer wall of the connecting tube 12, the upper end of the protrusion contacts the lower end of the hydraulic cylinder housing, and the lower end of the protrusion contacts the upper end of the blowout preventer 6, and a sealing ring is provided on the connecting tube 12 to achieve a sealed connection between the connecting tube 12 and the hydraulic cylinder housing and the blowout preventer 6.

[0034] Working principle:

[0035] like Figure 1As shown in the figure, the upper part of the connecting plate 13 at the wellhead is connected with the wellhead upper flange 19, and the wellhead valve 18 is connected above the wellhead upper flange 19. The upper part of the wellhead valve 18 is connected to the valve changer through the flange 15. When replacing the wellhead upper flange 19, the lower ends of the two support members 4 are respectively fixed on the connecting plate 13, and the plug 11 is sent to the specified position of the oil pipe hanger by the hydraulic cylinder, and the plug 11 is pressurized and sealed by the hydraulic cylinder to achieve the purpose of cutting off the airflow in the well; then, under the action of the support rod 4 and the upper bracket 2, the power of the hydraulic cylinder is used to lift the wellhead upper flange 19 up a certain distance, and the secondary pressurizing mechanism 5 is installed on the plug 11 to fix the plug 11 to prevent the plug 11 from shifting; the upper bracket 2 is removed to take out the hydraulic cylinder, the gas production wellhead valve 18 and the wellhead upper flange 19, and then the new wellhead upper flange 19 is replaced to achieve the purpose of replacing the wellhead.

[0036] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A valve changing device for replacing a flange on a natural gas production tree, comprising a mounting mechanism, a plug (11) and a secondary pressurizing mechanism (5), characterized in that: The mounting mechanism is provided with a telescopic mechanism (3), the output shaft of the telescopic mechanism (3) is movably connected to the plug (11), and the secondary pressurizing mechanism (5) is used to fix the plug (11); It also includes a lubricant preventer (6), which is installed at the lower end of the outer wall of the telescopic mechanism (3); The secondary pressurizing mechanism (5) comprises a pressing plate, a hole cooperating with the plug (11) is formed on the pressing plate, and fixing holes are formed at both ends of the pressing plate.

2. The valve changing device for replacing the flange on the natural gas production tree according to claim 1 is characterized in that: The mounting mechanism comprises an upper bracket (2), support members (4) are arranged on both sides below the upper bracket (2), the telescopic mechanism (3) is located between the two support members (4), and the end of the telescopic mechanism (3) can cooperate with the plug (11).

3. The valve changing device for replacing the flange on the natural gas production tree according to claim 2 is characterized in that: A joint (1) is provided at the upper end of the telescopic mechanism (3); the joint (1) penetrates the upper bracket (2); and a sealing ring A (8) is provided between the joint (1) and the telescopic mechanism (3).

4. The valve changing device for replacing the flange on the natural gas production tree according to claim 1 is characterized in that: A sealing ring B (9) is arranged between the inner side of the upper end of the anti-blowout pipe (6) and the outer wall of the telescopic mechanism (3), and a sealing ring C (10) is sleeved on the lower end of the anti-blowout pipe (6).

5. The valve changing device for replacing the flange on the natural gas production tree according to claim 4 is characterized in that: The lower end of the anti-blowout pipe (6) is also sleeved with a sealing gasket (7), and the sealing ring C (10) is located above the sealing gasket (7).

6. The valve changing device for replacing the flange on a natural gas production tree according to any one of claims 1 to 5, characterized in that: The telescopic mechanism (3) is a hydraulic oil cylinder, the upper end of the blowout prevention pipe (6) is connected to the lower end of the hydraulic oil cylinder housing, and the piston rod of the hydraulic oil cylinder and the blowout prevention pipe (6) are clearance-matched.

7. The valve changing device for replacing the flange on the natural gas production tree according to claim 6 is characterized in that: It also comprises a connecting tube (12), the upper end of which extends into the hydraulic cylinder housing, and the lower end of which extends into the anti-blowout pipe (6), and the connecting tube (12) is respectively sealedly connected to the hydraulic cylinder housing and the anti-blowout pipe (6).

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