Cable hole screwed plug for processing penetration leakage of Christmas tree cable

Abstract

The utility model discloses a cable hole screwed plug for processing penetration leakage of a Christmas tree cable, and belongs to the offshore oil and gas exploitation technology. The cable hole screwed plug for processing Christmas tree cable penetrating leakage comprises a plug block body, and a double-color sealing O-shaped ring is arranged on the side wall of the plug block body. The plugging block main body is provided with a hexagonal clamping block, and each processing plane of the hexagonal clamping block is provided with an NPT pressing joint hole. When the wellhead efficient cable seal fails, part of the original well cable efficient seal is detached and replaced by the cable hole screwed plug, and the two sealing rubber rings on the screwed plug are matched with a Christmas tree straight sealing cap, so that an oil gas overflow channel can be effectively plugged in time, and accidents are prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of offshore oil and gas exploitation, in particular to a cable hole plug for treating the leakage of the cable through the Christmas tree. Background Art

[0002] During the development and production process of the Bohai Oilfield, there are many oil and gas wells with high gas content, high gas-oil ratio and self-blowing capacity. During the production process of such oil and gas wells, with the upward migration of gas slippage and the action of well fluid, the wellhead tubing hanger and the cable seal of the Christmas tree bear a large pressure. At present, most of the Christmas trees in the Bohai region are old-fashioned Christmas trees, and the wellhead cable seals are mostly high-efficiency seals. Due to the special well conditions, the high-efficiency cable sealing performance of the tubing hanger and the Christmas tree is likely to decline or even fail due to factors such as high pressure and corrosion, resulting in the outward transmission of the well pressure and causing oil and gas leakage, bringing well control risks. Therefore, in order to quickly handle the well control risks of the leakage of the cable through the Christmas tree, it is of great significance to develop a cable hole plug for treating the leakage of the cable through the Christmas tree. Content of the Utility Model

[0003] In order to solve the above technical problems, the utility model provides a cable hole plug for treating the leakage of the cable through the Christmas tree. When the high-efficiency cable seal at the wellhead fails, part of the original well cable high-efficiency seal can be disassembled and replaced with the cable hole plug of the utility model. Relying on the two sealing rubber rings on the plug, it cooperates with the flat cap of the Christmas tree to quickly block the oil and gas overflow channel, ensure the integrity of the wellbore, and guarantee the life safety, property safety of on-site personnel and the marine ecological environment.

[0004] The utility model is achieved by the following technical solutions.

[0005] A cable hole plug for treating the leakage of the cable through the Christmas tree includes a plug body, and a two-color sealing O-ring is arranged on the side wall of the plug body; a hexagonal clamping block is arranged on the plug body, and NPT pressure test joint holes are opened on each processed plane of the hexagonal clamping block.

[0006] Further, a groove is opened on the side wall of the plug body, and the two-color sealing O-ring is arranged in the groove.

[0007] Further, the two-color sealing O-ring is a sealing O-ring with continuous stripes drawn on the ring body.

[0008] Further, a central hole is formed in the plug body and the hexagonal clamping block, and the central hole is communicated with each NPT pressure test joint hole.

[0009] Further, a lifting lug is arranged on the hexagonal clamping block.

[0010] The utility model has obtained the following beneficial effects.

[0011] (1) Convenient operation: Small in size, easy to process, portable, simple to operate and quick to install when in use. The utility model cable hole plug can be installed by removing the original high-efficiency sealed tablet or picking out a seal in one case, meeting the plugging requirements;

[0012] (2) High reusability: Low cost, the sealing O-ring is detachable and can be reused after replacing the sealing ring;

[0013] (3) Facilitate customization: Different outer diameter plugs can be processed according to different cable through holes of Christmas trees, with strong applicability;

[0014] (4) Facilitate checking whether the O-ring is bitten: A two-color sealing O-ring is arranged in the O-ring groove. The characteristic of the two-color sealing O-ring is that continuous stripes are drawn on the conventional sealing O-ring. When the stripes are missing or deformed, it indicates that the O-ring is bitten;

[0015] (5) Factory pressure test: NPT pressure connection holes are opened on each machined plane of the hexagonal clamping block. The NPT pressure connection holes adopt common specifications such as 1 / 4NPT, 1 / 8NPT, 7 / 8NPT, etc., and can be externally connected to the pressure pipeline. The internal parts of each NPT pressure connection hole are connected, and the internal hole of the hexagonal clamping block is connected to the NPT pressure connection hole. When the tool leaves the factory, a sealing end cover can be matched. Pressurize at one of the NPT joints (the pressure pipeline can be adapted to the specification), and install NPT plugs at the remaining joints. Judge the sealing performance of the O-ring by whether there is pressure loss;

[0016] (6) Facilitate disassembly and assembly: A lifting lug is arranged above the hexagonal clamping block, which is convenient for the disassembly and assembly of the tool. Brief description of the drawings

[0017] Figure 1 is the structural schematic diagram of the utility model;

[0018] Figure 2 is the sectional view of the utility model.

[0019] Among them: 1. Plug block body; 2. Two-color sealing O-ring; 3. Hexagonal clamping block; 4. NPT pressure connection hole; 5. Lifting lug; 6. Central hole. Detailed implementation manners

[0020] The technical solutions of the utility model will be clearly and completely described below through specific implementation manners.

[0021] As Figure 1-2 shown, a cable hole plug for treating the leakage of the cable through hole of the Christmas tree. When the high-efficiency cable seal at the wellhead fails, part of the original well cable high-efficiency seal can be disassembled and replaced with the cable hole plug of this application. Relying on the two sealing rubber rings on the plug, it cooperates with the flat cap of the Christmas tree to quickly plug the oil and gas overflow channel.

[0022] Specifically, the cable hole plug includes a plug block body 1, a two-color sealing O-ring 2, a hexagonal clamping block 3, an NPT pressure connection hole 4, and a lifting lug 5.

[0023] A groove is formed on the side wall of the plug block body 1, and the two-color sealing O-ring 2 is arranged in the O-ring groove. The feature of the two-color sealing O-ring 2 of the present invention is that continuous stripes are drawn on the conventional sealing O-ring. When the stripes are missing or deformed, it can indicate the O-ring biting edge.

[0024] The hexagonal clamping block 3 is welded to the plug block body 1. NPT pressure connection holes 4 are formed on each machined plane of the hexagonal clamping block 3. The NPT pressure connection holes 4 can be selected from common specifications such as 1 / 4 NPT, 1 / 8 NPT, 7 / 8 NPT, etc., and can be externally connected to a pressure pipeline. A central hole 6 is formed inside the hexagonal clamping block 3 and the plug block body 1, and the central hole 6 is communicated with each NPT pressure connection hole 4.

[0025] In this application, a lifting lug 5 is arranged above the hexagonal clamping block 3, which is convenient for the disassembly and assembly of tools.

[0026] The installation steps of the present invention are as follows:

[0027] (1) Select the cable hole plug of the present invention that matches the cable through-hole of the Christmas tree, and install two appropriate sealing O-rings;

[0028] (2) Close the downhole safety valve and the bleed valve of the cable packer;

[0029] (3) Reverse the process and drain the well pressure above the downhole safety valve and the cable packer;

[0030] (4) Cut the cable at the cable through-hole of the Christmas tree, and the remaining length of the cable head does not exceed 12 mm;

[0031] (5) Remove the flat cap of the Christmas tree, take out the original high-efficiency sealing washer or pick out a seal;

[0032] (6) Install the cable hole plug of the present invention, block the cable through-hole, install the flat cap of the Christmas tree and tighten the cap bolts to make it cooperate with the cable hole plug of the present invention to achieve the plugging of the cable through-hole of the Christmas tree.

[0033] The above-described embodiments are only described as the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by ordinary engineering and technical personnel in the field to the technical solution of the present invention should fall within the protection scope of the present invention. The technical content claimed by the present invention has been fully recorded in the claims.

Claims

1. A cable hole plug for dealing with the leakage of the cable passing through the Christmas tree, characterized in that: It includes a plug block body (1), and a two-color sealing O-ring (2) is provided on the side wall of the plug block body (1); a hexagonal clamping block (3) is provided on the plug block body (1), and NPT pressure tapping holes (4) are opened on each machined plane of the hexagonal clamping block (3).

2. A cable hole plug for dealing with the leakage of the cable passing through the Christmas tree according to claim 1, characterized in that: A groove is formed on the side wall of the plug block body (1), and the two-color sealing O-ring (2) is placed in the groove.

3. A cable hole plug for dealing with the leakage of the cable passing through the Christmas tree according to claim 1, characterized in that: The two-color sealing O-ring (2) is a sealing O-ring with continuous stripes drawn on the ring body.

4. A cable hole plug for treating the leakage of the cable passing through the Christmas tree according to claim 1, wherein: A central hole (6) is formed in the plug block body (1) and the hexagonal clamping block (3), and the central hole (6) is communicated with each NPT pressure tapping hole (4).

5. A cable hole plug for treating the leakage of the cable passing through the Christmas tree according to claim 1, characterized in that: A lifting lug (5) is provided on the hexagonal clamping block (3).

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