Wellhead anti-blocking conduit

Abstract

The well mouth anti-blocking guide pipe comprises a guide pipe body and a cover plate, the cover plate is of a round cake structure with a hole formed in the middle, and the guide pipe body is connected with the cover plate. The problem that the tubing coupling is clamped due to wellhead deflection is solved, and the problem that the tubing coupling clamps a casing head step is also solved; the device is easy to install, can be directly placed at the position from a wellhead blowout preventer to a casing head in the process of lowering an oil pipe, and can play a role in centralizing the oil pipe; after the device is installed, normal well shut-in and liquid filling work of underground operation are not affected, maintenance is convenient, and operation is safe and reliable.

Description

Technical Field

[0001] The invention belongs to the technical field of oil well production auxiliary equipment and relates to a wellhead anti-stuck guide tube. Background Art

[0002] During downhole operations, due to the presence of steps between the casing head and the casing coupling of some wells, wellhead deviation and other reasons, the tubing couplings often get stuck during downhole operations, which leads to some problems: First, during the process of lowering the bridge plug, the tubing coupling will generate pressure excitement when it gets stuck, which may easily cause the bridge plug to be set midway, resulting in additional operations such as drilling the plug and tripping the drill, affecting the wellbore quality, extending the operation cycle, and increasing the well control risk; Second, during the process of lowering the tubing, the tubing coupling gets stuck, causing damage to the tubing, which may easily cause the tubing to fall into the well, resulting in complex downhole accidents, which may easily cause downhole overhaul operations and increase operating costs.

[0003] In the prior art, such problems can be avoided by installing a self-sealing wellhead. However, the step of the casing head of some wells is too wide and the wellhead is seriously deflected. After installing the self-sealing wellhead, the problem of the oil pipe coupling getting stuck still cannot be solved. Summary of the invention

[0004] The purpose of the present invention is to provide a wellhead anti-stuck guide tube, which solves the problem in the prior art that the oil pipe coupling is stuck at the wellhead during the downhole operation.

[0005] The technical solution adopted by the present invention is a wellhead anti-stuck conduit, which comprises a conduit and a cover plate. The cover plate is a round cake structure with a hole in the middle, and the conduit is connected to the cover plate.

[0006] The present invention is also characterized in that the end surface of one end of the conduit is embedded and fixedly connected with the inner ring edge of the cover plate.

[0007] The present invention is also characterized in that a lifting ring is fixedly connected to the side surface of the cover plate.

[0008] The present invention is also characterized in that a plurality of fixing pins are symmetrically arranged around the circular hole on the bottom surface of the cover plate.

[0009] The present invention is also characterized in that a plurality of liquid-repelling holes are evenly opened on the conduit.

[0010] The beneficial effects of the present invention are as follows: it solves the problem that the oil pipe coupling is stuck due to wellhead deviation, thereby damaging the blowout preventer, and also solves the problem that the oil pipe coupling is stuck on the step of the casing head; the device is easy to install and can be directly placed from the wellhead blowout preventer to the casing head during the oil pipe lowering process, so as to play the role of straightening the oil pipe; after the device is installed, it does not affect the normal shut-in and filling work of the downhole operation, and it is easy to maintain and safe and reliable to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1It is a structural schematic diagram of the wellhead anti-stuck conduit of the present invention.

[0012] In the figure, 1, conduit; 2, drainage hole; 3, lifting ring; 4, cover plate; 5, fixing pin. DETAILED DESCRIPTION

[0013] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0014] like Figure 1 As shown, the wellhead anti-stuck conduit comprises a conduit 1, a drainage hole 2, a lifting ring 3, a cover plate 4, and a fixing pin 5. The cover plate 4 has a circular hole, the conduit 1 is sealed and welded to the bottom surface of the cover plate 4 along the edge of the circular hole, and two lifting rings 3 are welded on both sides of the cover plate 4. Two fixing pins 5 are symmetrically distributed on the outside of the conduit 1 and are also welded to the bottom surface of the cover plate 4. The conduit 1 has a plurality of drainage holes 2 distributed thereon.

[0015] The drainage hole 2 is arranged on the conduit 1, which can make the conduit inside and outside communicate during the process of filling the oil pipe, so that it can be filled with liquid normally to ensure the safety of well killing. The lifting ring 3 is arranged on both sides of the cover plate 4 to facilitate the well closing of the blowout preventer and ensure the safety of well control. The conduit 1 is arranged on the bottom surface of the cover plate 4 and is located below the casing head after installation. The fixing pin 5 is arranged on the bottom surface of the cover plate 4 to play the role of fixing and preventing rotation.

[0016] The present invention is installed on the water pouring tee of the blowout preventer when in use. During installation, the fixing pin 5 is inserted into the screw hole of the water pouring tee of the blowout preventer so that the wellhead anti-stuck conduit is fixedly connected to the blowout preventer. The lower end of the conduit 1 is below the casing head. When the oil pipe is lifted and lowered in the conduit 1, the casing head step and the wellhead deflection position can be avoided, effectively avoiding the problem of the oil pipe coupling being stuck during the downhole operation. When shutting in the well, the lifting ring 3 can be hung on the lifting ring of the well repair machine, and the well can be shut down after the conduit is lifted out of the blowout preventer.

[0017] Example 1

[0018] like Figure 1 As shown, the wellhead anti-stuck conduit proposed in this embodiment includes a conduit 1 and a cover plate 4. The cover plate 4 is a round cake structure with a hole in the middle, and the conduit 1 is connected to the cover plate 4.

[0019] Example 2

[0020] like Figure 1 As shown, the wellhead anti-stuck conduit proposed in this embodiment includes a conduit 1 and a cover plate 4. The cover plate 4 is a round cake structure with a hole in the middle, and the conduit 1 is connected to the cover plate 4.

[0021] One end surface of the conduit 1 is engaged and fixedly connected with the inner ring edge of the cover plate 4. A lifting ring 3 is fixedly connected to the side surface of the cover plate 4.

[0022] Example 3

[0023] like Figure 1As shown, the wellhead anti-stuck conduit proposed in this embodiment includes a conduit 1 and a cover plate 4. The cover plate 4 is a round cake structure with a hole in the middle, and the conduit 1 is connected to the cover plate 4.

[0024] One end surface of the conduit 1 is engaged and fixedly connected with the inner ring edge of the cover plate 4. A lifting ring 3 is fixedly connected to the side surface of the cover plate 4.

[0025] A plurality of fixing pins 5 are symmetrically arranged around the circular hole on the bottom surface of the cover plate 4. A plurality of liquid-repelling holes 2 are evenly opened on the conduit 1.

Claims

1. Wellhead anti-stuck conduit, characterized by: It comprises a conduit (1) and a cover plate (4); the cover plate (4) is a round cake structure with a hole in the middle; the conduit (1) is connected to the cover plate (4).

2. The wellhead anti-stuck catheter according to claim 1, characterized in that: An end surface of one end of the conduit (1) is embedded and fixedly connected with the inner ring edge of the cover plate (4).

3. The wellhead anti-stuck catheter according to claim 1, characterized in that: A lifting ring (3) is fixedly connected to the side surface of the cover plate (4).

4. The wellhead anti-stuck catheter according to claim 1, characterized in that: A plurality of fixing pins (5) are symmetrically arranged around the circular hole on the bottom surface of the cover plate (4).

5. The wellhead anti-stuck catheter according to claim 1, characterized in that: The conduit (1) is evenly provided with a plurality of liquid-repelling holes (2).

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