A self-sealing blowout-preventor type wellhead Christmas tree

Abstract

The application belongs to the technical field of Christmas trees, and relates to a self-sealing blowout-preventing wellhead Christmas tree device, which comprises a Christmas tree main body, a mounting pipe fixedly installed on the Christmas tree main body, a spiral plate fixedly connected to the inner wall of the bottom of the mounting pipe, the spiral plate being arranged in a spiral shape from top to bottom, a spiral-shaped hose fixedly connected to the inside of the spiral plate, a connecting plate fixedly connected to the top in the mounting pipe, first liquid channels communicated with each other being formed in the connecting plate and the mounting plate, the end of the first liquid channel being fixedly communicated with the bottom end of the hose, a hard block fixedly connected to the end of the hose, and a second liquid channel formed in the hard block. The device has the advantages that the diameter of the second liquid channel is smaller than the diameter of the pipe formed by the rubber pipe and the metal sheet, so that the oil discharge amount is reduced, the oil can extrude the metal sheet and the sealing strip, the sealing strip is tightly attached to the wellhead oil outlet pipe, the connection between the wellhead oil outlet pipe and the mounting pipe is more compact, and the risk of leakage is reduced.

Description

Technical Field

[0001] This invention belongs to the field of wellhead technology and relates to a self-sealing blowout preventer wellhead ... Background Technology

[0002] A Christmas tree is a wellhead device used to extract oil in flowing wells and mechanically operated wells. It is the main equipment at the top of an oil and gas well for controlling and regulating oil and gas production, and mainly consists of three parts: the casing head, the tubing head, and the Christmas tree itself. Currently, during installation, Christmas trees are typically sealed and fixed using flanges on the installation pipe and the wellhead outlet pipe. However, due to the high pressure of the oil coming from the wellhead outlet pipe, leakage can occur at the connection between the installation pipe and the wellhead outlet pipe under long-term pressure, leading to oil ejection. Therefore, a self-sealing blowout preventer (BOP) Christmas tree device is needed.

[0003] A wellhead device for an oil production tree, disclosed in Chinese patent CN202110276140.1, includes a tubing head, a pressure relief box, a diverter pipe, a six-way connector, and an upper end of the oil production tree. The upper end of the oil production tree is connected to the six-way connector via a connecting pipe, and the six-way connector has diverter pipe connection holes at the front, back, left, right, and bottom.

[0004] The connecting pipe in the wellhead assembly of the wellhead is connected to the wellhead via a flange. After connection, due to the high pressure of the oil coming out of the wellhead pipe, leakage is likely to occur at the connection point under long-term pressure.

[0005] To address the above problems, this invention proposes a self-sealing blowout preventer wellhead tree device. Summary of the Invention

[0006] To address the problems existing in the background art, the present invention proposes a self-sealing blowout preventer wellhead production tree device.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: it includes a tree trunk body, an installation pipe is fixedly installed on the tree trunk body, a spiral plate is fixedly connected to the inner wall of the bottom of the installation pipe, the spiral plate is spirally arranged from top to bottom, and a spiral hose is fixedly connected inside the spiral plate.

[0008] A connecting plate is fixedly connected to the top of the installation tube. Both the connecting plate and the installation tube are provided with a first liquid channel that communicates with each other. The end of the first liquid channel is fixedly connected to the bottom end of the hose.

[0009] A rigid block is fixedly connected to the end of the hose, and a second liquid channel is provided on the rigid block. The end of the second liquid channel is fixedly connected to the top of the hose, and the diameter of the second liquid channel is smaller than the diameter of the hose. A baffle is fixedly connected to one end of the top of the spiral plate, and the end of the second liquid channel away from the hose faces the baffle.

[0010] Furthermore, the hose is composed of a rubber tube, a metal sheet, and a sealing strip, and the rubber tube, the metal sheet, and the sealing strip are all arranged in a spiral shape;

[0011] The rubber tube is fixedly connected to the inner wall of the installation tube. The cross-section of the rubber tube is C-shaped. The open end of the rubber tube is away from the inner wall of the installation tube. The metal sheet is fixedly connected to the open end of the rubber tube. The sealing strip is fixedly connected to one side of the metal sheet. The side of the metal sheet away from the sealing strip is flush with the inner surface of the spiral plate.

[0012] Furthermore, the first liquid channel on the connecting plate is arranged horizontally, and the first liquid channel on the mounting tube is arranged in an L-shape. The end of the first liquid channel on the mounting tube passes through the spiral plate and is fixedly connected to the bottom end of the rubber tube.

[0013] Furthermore, the bottom surface of the connecting plate away from the inner wall of the mounting pipe is provided with a flared opening, which is frustoconical in shape, and the top of the flared opening is connected to the first liquid channel on the connecting plate.

[0014] Furthermore, the rigid block is L-shaped, with one end fixedly connected to the top of the rubber tube, metal sheet, and sealing strip, and the other end slidably disposed on the top of the spiral plate.

[0015] Furthermore, one side of the rigid block slides against the inner wall of the mounting tube, and the other side of the rigid block is flush with the inner surface of the spiral plate.

[0016] Furthermore, the diameter of the second liquid channel is smaller than the diameter of the tube formed by the rubber tube and the metal sheet, while the diameter of the first liquid channel is equal to the diameter of the tube formed by the rubber tube and the metal sheet.

[0017] Furthermore, the metal sheet is made of a flexible metal material, and the sealing strip is made of rubber.

[0018] Furthermore, a wellhead oil outlet pipe is detachably installed at the bottom of the installation pipe, and both the wellhead oil outlet pipe and the installation pipe are equipped with flanges.

[0019] Furthermore, a sealing gasket is provided between the flange on the mounting pipe and the flange on the wellhead oil outlet pipe.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. This self-sealing blowout preventer wellhead production tree device is equipped with a spiral rubber tube, which is fixed inside the spiral plate. When oil is produced from the wellhead production pipe, some oil will enter the pipe formed by the rubber tube and the metal sheet through the flared end and the first liquid channel. Since the diameter of the second liquid channel is smaller than the diameter of the pipe formed by the rubber tube and the metal sheet, the oil discharge is reduced. The oil will squeeze the metal sheet and the sealing strip, making the sealing strip tightly adhere to the outer surface of the wellhead production pipe, making the connection between the wellhead production pipe and the installation pipe tighter and reducing the risk of leakage.

[0022] 2. This self-sealing blowout preventer wellhead production tree device is equipped with a baffle. The oil sprayed from the second fluid channel will be blocked by the baffle. At this time, the sprayed oil has a reaction force on the hard block, causing the hard block to move away from the baffle. The hard block will pull the ends of the rubber tube, sealing strip, and metal sheet to move, causing the rubber tube, sealing strip, and metal sheet to deform, so that the sealing strip is tightly attached to the wellhead oil outlet pipe, further improving the tightness of the connection between the wellhead oil outlet pipe and the installation pipe. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the internal structure of the mounting tube in this invention;

[0025] Figure 3 This is a schematic diagram of the internal structure of the spiral plate in this invention;

[0026] Figure 4 This is a schematic diagram of the connecting plate in this invention;

[0027] Figure 5 This is a schematic diagram of the structure of the rubber tube in this invention;

[0028] Figure 6 This is a cross-sectional structural schematic diagram of the rubber tube in this invention;

[0029] Figure 7 This is a top view of the hard block and baffle in this invention;

[0030] Figure 8 This is a schematic diagram of the hard block structure in this invention.

[0031] In the diagram: 1. Installation pipe; 2. Spiral plate; 3. Connecting plate; 4. Flared end; 5. First liquid channel; 6. Metal sheet; 7. Sealing strip; 8. Rubber tube; 9. Hard block; 10. Second liquid channel; 11. Baffle; 12. Wellhead oil outlet pipe; 13. Sealing gasket. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] like Figures 1-8 As shown, the technical solution adopted by the present invention is as follows: A self-sealing blowout preventer wellhead production tree device includes a production tree body, on which an installation pipe 1 is fixedly installed. A wellhead oil outlet pipe 12 is detachably installed at the bottom end of the installation pipe 1. Both the wellhead oil outlet pipe 12 and the installation pipe 1 are provided with flanges. The wellhead oil outlet pipe 12 is fixed to the installation pipe 1 by the flanges, which is the existing installation method.

[0034] A gasket 13 is provided between the flange on the mounting pipe 1 and the flange on the wellhead oil outlet pipe 12. The gasket 13 is made of rubber, so that when the two flanges are connected, the gasket 13 is squeezed and the gasket 13 tightly fills the gap between the two flanges through elastic deformation, so that the connection is tight.

[0035] A spiral plate 2 is fixedly connected to the inner wall of the bottom of the installation tube 1. The spiral plate 2 is arranged in a spiral shape from top to bottom. A spiral hose is fixedly connected inside the spiral plate 2.

[0036] The hose consists of a rubber tube 8, a metal sheet 6, and a sealing strip 7, all of which are arranged in a spiral shape. This allows the shape of the hose to match the shape of the spiral plate 2, and the spiral arrangement fills the interior of the spiral plate 2.

[0037] The rubber tube 8 is fixedly connected to the inner wall of the mounting tube 1. The cross-section of the rubber tube 8 is C-shaped, and the open end of the rubber tube 8 is away from the inner wall of the mounting tube 1.

[0038] A metal sheet 6 is fixedly connected to the open end of the rubber tube 8, and a sealing strip 7 is fixedly connected to one side of the metal sheet 6. The surfaces of both the metal sheet 6 and the sealing strip 7 are fixedly connected to the spiral plate 2, and the side of the metal sheet 6 away from the sealing strip 7 is flush with the inner surface of the spiral plate 2.

[0039] The metal sheet 6 is made of an elastic metal material, and the sealing strip 7 is made of rubber. This allows both the metal sheet 6 and the sealing strip 7 to deform under tension or pressure.

[0040] A connecting plate 3 is fixedly connected to the top of the installation tube 1. Both the connecting plate 3 and the installation tube 1 have interconnected first liquid channels 5, and the end of the first liquid channel 5 is fixedly connected to the bottom end of the hose.

[0041] The first liquid channel 5 on the connecting plate 3 is horizontally arranged, and the first liquid channel 5 on the mounting pipe 1 is L-shaped. The end of the first liquid channel 5 on the mounting pipe 1 passes through the spiral plate 2 and is fixedly connected to the bottom end of the rubber tube 8. The connection between the end of the first liquid channel 5 and the tube formed by the rubber tube 8 and the metal sheet 6 is connected and sealed.

[0042] A flared opening 4 is provided on the bottom surface of the end of the connecting plate 3 away from the inner wall of the mounting pipe 1. The flared opening 4 is frustoconical. The top of the flared opening 4 is connected to the first liquid channel 5 on the connecting plate 3. This allows some oil to enter the interior of the first liquid channel 5 through the flared opening 4 when the mounting pipe 1 is transporting oil, and the oil in the first liquid channel 5 enters the tube formed by the rubber tube 8 and the metal sheet 6.

[0043] A rigid block 9 is fixedly connected to the end of the hose. The rigid block 9 is made of stainless steel and is not easily deformed under stress.

[0044] The rigid block 9 is L-shaped. One end of the rigid block 9 is fixedly connected to the top of the rubber tube 8, the metal sheet 6, and the sealing strip 7, while the other end of the rigid block 9 is slidably disposed on the top of the spiral plate 2. This allows the rigid block 9 to pull one end of the metal sheet 6, the sealing strip 7, and the rubber tube 8 when it moves, causing these components to deform under stress.

[0045] One side of the rigid block 9 slides against the inner wall of the mounting tube 1, and the other side of the rigid block 9 is flush with the inner surface of the spiral plate 2.

[0046] A second liquid channel 10 is formed on the rigid block 9. The end of the second liquid channel 10 is fixedly connected to the top of the hose, and the diameter of the second liquid channel 10 is smaller than the diameter of the hose. The connection between the end of the second liquid channel 10 and the tube formed by the rubber tube 8 and the metal sheet 6 is connected and sealed. This allows the oil entering the tube formed by the rubber tube 8 and the metal sheet 6 to flow into the second liquid channel 10.

[0047] A baffle 11 is fixedly connected to one end of the top of the spiral plate 2, and the end of the second liquid channel 10 away from the hose faces the baffle 11. The second liquid channel 10 discharges oil toward the baffle 11. Due to the obstruction of the baffle 11, the oil will have a reaction force on the hard block 9, causing the hard block 9 to move away from the baffle 11.

[0048] The diameter of the second liquid channel 10 is smaller than the diameter of the tube formed by the rubber tube 8 and the metal sheet 6. The diameter of the first liquid channel 5 is equal to the diameter of the tube formed by the rubber tube 8 and the metal sheet 6. When the oil in the tube formed by the rubber tube 8 and the metal sheet 6 flows into the second liquid channel 10, the oil flow rate decreases, causing the oil in the rubber tube 8 to not have enough time to be discharged, thus squeezing the rubber tube 8 and causing the rubber tube 8, the metal sheet 6, and the sealing strip 7 to expand.

[0049] Working principle:

[0050] In use, move the oil outlet end of the wellhead oil outlet pipe 12 into the interior of the mounting pipe 1. Continue until the flange on the wellhead oil outlet pipe 12 aligns with the flange on the mounting pipe 1, then secure the flange with bolts.

[0051] After the wellhead oil outlet pipe 12 is fixed to the installation pipe 1, the top end of the wellhead oil outlet pipe 12 is located at the bottom of the connecting plate 3, and the spiral plate 2, sealing strip 7, and hard block 9 are all in contact with the outer surface of the wellhead oil outlet pipe 12. The flared end 4 is located directly above the oil outlet end of the wellhead oil outlet pipe 12.

[0052] When oil comes out of the wellhead oil outlet pipe 12, some oil will enter the interior of the flared end 4, then flow into the first liquid channel 5, enter the pipe surrounded by the rubber tube 8 and the metal sheet 6, and finally enter the second liquid channel 10 and be discharged.

[0053] Because the diameter of the second liquid channel 10 is smaller than the diameter of the tube formed by the rubber tube 8 and the metal sheet 6, the amount of oil discharged from the second liquid channel 10 is less. If the oil is not discharged from the rubber tube 8 in time, it will expand and deform, simultaneously squeezing the metal sheet 6 and the sealing strip 7, making the sealing strip 7 fit more tightly against the outer surface of the wellhead oil outlet pipe 12. This results in a tighter connection between the wellhead oil outlet pipe 12 and the installation pipe 1, achieving a self-sealing tight connection between the installation pipe 1 and the spiral plate 2, thus providing a blowout prevention effect.

[0054] When the second liquid channel 10 discharges oil, the oil is sprayed towards the baffle 11. Due to the obstruction of the baffle 11, the sprayed oil has a reaction force on the hard block 9, causing the hard block 9 to move away from the baffle 11.

[0055] The hard block 9 will pull the ends of the rubber tube 8, sealing strip 7, and metal sheet 6 to move, causing the rubber tube 8, sealing strip 7, and metal sheet 6 to deform. This increases the contraction force of the metal sheet 6 and the squeezing force on the sealing strip 7, thereby making the sealing strip 7 stick tightly to the wellhead oil outlet pipe 12, further improving the tightness of the connection between the wellhead oil outlet pipe 12 and the installation pipe 1.

[0056] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A self-sealing blowout preventer wellhead Christmas tree device, comprising a Christmas tree body, characterized in that, An installation pipe (1) is fixedly installed on the main body of the oil production tree. A spiral plate (2) is fixedly connected to the inner wall of the bottom of the installation pipe (1). The spiral plate (2) is arranged in a spiral shape from top to bottom. A spiral hose is fixedly connected inside the spiral plate (2). A connecting plate (3) is fixedly connected to the top of the installation tube (1). Both the connecting plate (3) and the installation tube (1) are provided with a first liquid channel (5) that is interconnected. The end of the first liquid channel (5) is fixedly connected to the bottom end of the hose. The end of the hose is fixedly connected to a hard block (9), and a second liquid channel (10) is provided on the hard block (9). The end of the second liquid channel (10) is fixedly connected to the top of the hose, and the diameter of the second liquid channel (10) is smaller than the diameter of the hose. A baffle (11) is fixedly connected to one end of the top of the spiral plate (2), and the end of the second liquid channel (10) away from the hose faces the baffle (11). The hose is composed of a rubber tube (8), a metal sheet (6), and a sealing strip (7), and the rubber tube (8), the metal sheet (6), and the sealing strip (7) are all arranged in a spiral shape; The rubber tube (8) is fixedly connected to the inner wall of the mounting tube (1). The cross-section of the rubber tube (8) is C-shaped. The open end of the rubber tube (8) is far away from the inner wall of the mounting tube (1). The metal sheet (6) is fixedly connected to the open end of the rubber tube (8). The sealing strip (7) is fixedly connected to one side of the metal sheet (6). The side of the metal sheet (6) away from the sealing strip (7) is flush with the inner surface of the spiral plate (2). The diameter of the second liquid channel (10) is smaller than the diameter of the tube formed by the rubber tube (8) and the metal sheet (6), and the diameter of the first liquid channel (5) is equal to the diameter of the tube formed by the rubber tube (8) and the metal sheet (6). The bottom surface of the connecting plate (3) away from the inner wall of the installation pipe (1) is provided with a flared opening (4). The flared opening (4) is frustum-shaped and the top of the flared opening (4) is connected to the first liquid channel (5) on the connecting plate (3).

2. The self-sealing blowout preventer wellhead Christmas tree device according to claim 1, characterized in that: The first liquid channel (5) on the connecting plate (3) is arranged horizontally, and the first liquid channel (5) on the mounting pipe (1) is arranged in an L-shape. The end of the first liquid channel (5) on the mounting pipe (1) passes through the spiral plate (2) and is fixedly connected to the bottom end of the rubber tube (8).

3. The self-sealing blowout preventer wellhead Christmas tree device according to claim 1, characterized in that: The hard block (9) is L-shaped. One end of the hard block (9) is fixedly connected to the top of the rubber tube (8), the metal sheet (6), and the sealing strip (7). The other end of the hard block (9) is slidably disposed on the top of the spiral plate (2).

4. A self-sealing blowout preventer wellhead Christmas tree device according to claim 3, characterized in that: One side of the hard block (9) slides against the inner wall of the mounting tube (1), and the other side of the hard block (9) is flush with the inner surface of the spiral plate (2).

5. A self-sealing blowout preventer wellhead Christmas tree device according to claim 1, characterized in that: The metal sheet (6) is made of an elastic metal material, and the sealing strip (7) is made of rubber.

6. A self-sealing blowout preventer wellhead Christmas tree device according to claim 1, characterized in that: The bottom end of the installation pipe (1) is detachably installed with a wellhead oil outlet pipe (12), and both the wellhead oil outlet pipe (12) and the installation pipe (1) are equipped with flanges.

7. A self-sealing blowout preventer wellhead Christmas tree device according to claim 6, characterized in that: A sealing gasket (13) is provided between the flange on the installation pipe (1) and the flange on the wellhead oil outlet pipe (12).

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