CN201778736U - Anti-corrosion cap for underwater well head - Google Patents

Abstract

The utility model discloses an anti-corrosion cap for an underwater wellhead head, which comprises a cap body fixedly connected with an end cap and a cylinder body, a connecting block connected to the axis center of the upper surface of the end cap, and a through hole is opened between the connecting block and the axis center of the end cap. A one-way valve is installed in the through hole of the connecting block. There are several sets of positioning blocks evenly arranged on the inner wall of the cylinder along the circumference. A locking block is installed on each set of positioning blocks. The locking block is an elastic material part. A conduit channel connecting the inner cavity of the underwater wellhead head and the inner cavity of the cylinder is provided; the slope at the upper end of the locking block matches the slope of the outer toothed surface of the underwater wellhead head. The device of the utility model can prevent the head of an underwater well from being damaged by falling objects and corroded by marine organisms, etc., and has a compact, simple structure and convenient operation.

Description

Underwater well head anti-corrosion cap

technical field

The utility model belongs to the technical field of offshore oil drilling and relates to an anticorrosion cap for an underwater well head.

Background technique

In the process of marine deepwater oil exploration and development, the underwater wellhead is one of the key equipment. The underwater wellhead anti-corrosion cap is a device installed on the upper part of the underwater wellhead to protect the underwater wellhead. Its function is to prevent the underwater wellhead from being damaged by falling objects and corrosion by marine organisms when the well is temporarily abandoned. . As an important part of the underwater wellhead equipment, the underwater wellhead anti-corrosion cap needs to seal and protect the wellbore after the casing is lowered and before the well completion operation. If the inner hole of the underwater wellhead is directly exposed to seawater, it is easy to be damaged by falling objects and corroded by marine organisms, thereby damaging the underwater wellhead.

Contents of the invention

The purpose of the utility model is to provide an underwater wellhead anti-corrosion cap, which solves the problem that the inner hole of the underwater wellhead is easily damaged by falling objects and corroded by marine organisms.

The technical solution adopted by the utility model is an anti-corrosion cap for underwater wellhead head, which includes a cap body fixedly connected by an end cap and a cylinder body. A through hole is opened, and a one-way valve is installed in the through hole of the connecting block. There are multiple sets of positioning blocks evenly arranged along the circumference of the inner wall of the cylinder, and a locking block is installed on each set of positioning blocks through screws.

The beneficial effect of the utility model is that it can effectively avoid the damage of falling objects and the corrosion of marine organisms, etc. The structure is compact, simple and easy to operate, and fully meets the requirements of underwater operations. the

Description of drawings

Fig. 1 is the structural representation of the utility model device.

In the figure, 1. connecting block, 2. one-way valve, 3. end cover, 4. barrel, 5. locking block, 6. positioning block, 7. screw, 8. conduit channel, 9. underwater well head.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Fig. 1, the structure of the utility model device is to include a cap body welded into a cap body by the end cap 3 and the cylindrical body 4, the upper surface axis of the end cap 3 is connected with a connection block 1, and the connection block 1 is connected with the end cap 3 by threads, The connection block 1 and the end cover 3 have a through hole in the axis center, and a check valve 2 is installed in the through hole of the connection block 1. On the inner wall of the cylinder 4, there are 4 sets of positioning blocks 6 uniformly arranged along the circumference, and each set of positioning blocks 6 A locking block 5 is installed by screw 7 on the top, and the locking block 5 is an elastic material part, and the inclined-plane of the upper end of the locking block 5 cooperates with the inclined-plane of the external toothed surface of the underwater well head. The end cover 3 is provided with a conduit channel 8 connecting the inner cavity of the submerged wellhead 9 and the inner cavity of the cylinder body 4 .

The locking block 5 is an elastic material part. The underwater wellhead head anticorrosion cap is locked on the slope of the underwater wellhead head 9 external toothed surfaces by locking block 5 to prevent the detachment of the anticorrosion cap, and the locking of the underwater wellhead head anticorrosion cap can also be realized by other forms.

Referring to Fig. 1, the working principle of the utility model device is: welding the connection block 1, the end cover 3 and the cylinder body 4 into one body, then screw the connection block 1 into the end cover 3 through threads, and the one-way valve 2 through threads. into the connection block 1, four positioning blocks 6 are uniformly welded on the inner wall of the cylinder 4, the locking block 5 is mounted on the positioning block 6 through the screw 7, and the conduit channel 8 is connected together through the threaded hole on the end cover 3, Form a closed fluid circuit.

After offshore drilling and completion, when needing to temporarily abandon the well and install the anticorrosion cap, the anticorrosion cap is installed with a special tool to drive the anticorrosion cap slowly into the end face of the underwater wellhead head 9 tops. Since the upper part of the locking block 5 has a slope that matches the external toothed surface of the underwater wellhead 9, the locking block 5 just locks the anticorrosion cap on the underwater wellhead 9 to realize automatic locking. Ripped off. After the anti-corrosion cap is automatically locked, the anti-corrosion liquid is poured into the inner hole of the underwater wellhead 9 through the inner hole of the connecting block 1 and the one-way valve 2. By continuously applying pressure, the seawater in the inner hole of the underwater wellhead 9 passes through the conduit channel 8 gradually discharged. Like this, the annular space between the underwater wellhead head 9 inside, outside and the anticorrosion cap is all filled with anticorrosion liquid. After the seawater in the underwater wellhead and the anticorrosion cap is emptied, gradually close the anticorrosion liquid filling pump until the internal and external pressures are balanced. Due to the existence of the one-way valve 2, the anti-corrosion liquid in the inner hole of the underwater wellhead 9 will not overflow, and the external seawater will not flow in, which prevents the underwater wellhead 9 from being corroded by marine organisms, etc., and plays a protective role. .

When needing to take out the anticorrosion cap, along with the lifting of the special tool for taking out the anticorrosion cap, the huge lifting force can make the locking block 5 break away from the underwater wellhead 9 along the inclined plane matched with the underwater wellhead 9, and realize automatic tripping. After the anticorrosion cap is taken out, if the locking block 5 is damaged, it should be reinstalled for reuse.

Claims (3)

1. An anti-corrosion cap for underwater wellhead, characterized in that: it includes a cap body fixedly connected by an end cap (3) and a cylinder (4), and the upper surface of the end cap (3) is connected with a connecting block (1) , the connection block (1) and the end cover (3) have a through hole in the shaft center, and a check valve (2) is installed in the through hole of the connection block (1), and the inner wall of the cylinder (4) is uniformly arranged along the circumference. Multiple sets of positioning blocks (6), each set of positioning blocks (6) are equipped with a locking block (5) through screws (7). 2. The underwater wellhead anti-corrosion cap according to claim 1, characterized in that: the end cover (3) is provided with a conduit channel connecting the inner cavity of the underwater wellhead (9) and the inner cavity of the cylinder (4) (8). 3. The underwater wellhead anti-corrosion cap according to claim 1, characterized in that: the slope at the upper end of the locking block (5) matches the slope of the external toothed surface of the underwater wellhead (9).

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