JPH0547827Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a tree for a buried wellhead device installed in a well drilled under the sea.

[Prior Art] A tree for a buried type wellhead equipment fixed to the seabed for oil drilling has a production line 1 for pumping produced fluid and a tree in a caisson constituting the shell of the main body of the tree, as shown in Fig. 2. An annual line 2 is used for purposes other than production, such as inspecting the situation below, and a service line 3 is used as an auxiliary line when the production line 1 breaks down. , 3 have master valves 5 ₁ , 5 ₂ , respectively at the upper position of the tree connector 4 at the lower end.
5 ₃ and by providing intermediate tree connectors 6 above the master valves 5 ₁ , 5 ₂ , 5 ₃ , the upper tree portion 7u and the lower tree portion 7l are connected.
It is designed so that it can be placed and collected separately.
Further, each line 1, 2, 3 is provided with a top master valve 8 above the intermediate tree connector 6, and each of the top master valves 8
A branch point called a Y spool 9 is formed at a further upper position of the Y spool 9, and a connecting line 10f to the flow line extending laterally and a connecting line 10f extending upward to the flow line are formed at the Y spool 9. 10f is branched into a connection line 10w to a wire line used for backup. In addition, 11 is a wing valve provided on each line 1, 2, and 3 of the line 10f for connection to the flow line, 12 is a flow line connector, and 13 is each line 1 of the line 10w for connection to the wire line.
Swab valves 2 and 3 are provided, and 14 is a tree cap.

[Problem to be solved by the invention] However, in the case of such a conventional tree for buried type wellhead equipment, the annulus line 2 and the service line 3, which do not need to be used all the time, are also branched off at the Y spool 9 in the same way as the production line 1. Because of the line configuration, the number of lines passing through the upper tree portion 7u increases, resulting in the problem that the diameter of the entire caisson has to be increased.

Therefore, the present invention aims to reduce the size of the caisson as much as possible, and to provide a tree for a buried type wellhead equipment in which the size of the caisson is made small without causing any problems in flow line work and wire line work. It is.

[Means for Solving the Problems] In order to achieve the above object, the present invention connects the production line, annual line, and service line passed through the caisson to the connection line to the flow line and the wire line using a Y spool. In a tree for a buried wellhead device having a configuration in which the connection line is branched into a connection line, the annulus line is joined to the service line below the Y spool, and each connection line to the flow line and wire line is connected to the service line. Each line has a production line and the above-mentioned merging line, and the above-mentioned merging line is equipped with a switching valve for selectively functioning as an annulus line or a service line.

[Function] By merging the annual line with the service line at the bottom of the Y spool, the number of lines that make up the connection line to the flow line and the connection line to the wire line passing through the branch point of the Y spool is reduced. This allows the diameter of the caisson to be reduced. Further, the merged lines can be used both as an annulus line and a service line by means of a switching valve, so there is no problem with flow line work and wire line work.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

Figure 1 shows one embodiment of the present invention;
Similar to the tree for buried type wellhead equipment shown in the figure, it consists of an upper tree part 7u and a lower tree part 7l, and a connection line 10f to a flow line is formed by branching from the upper tree part 7u by a Y spool 9. and line 10 for connection to the wire line
w, so that both flow line work and wire line work can be performed, the annulus line 2 is joined to the service line 3 in the lower tree section 7l, and the joined service line 3 is By switching the master valves 5 ₂ and 5 ₃ , the upper tree section 7u can also function as the annual line 2, and the Y
The spool 9 has a branched configuration with only two lines, a production line 1 and a service line 3. In addition,
15 is a crossover valve.

As mentioned above, in the case of the present invention, the annulus line 2 is connected to the service line 3 at the lower tree portion 7l.
Since it was merged with the
Even if each line is branched at the Y spool 9, the number of lines is only 4, compared to the conventional example which required 6 lines, and the diameter of the caisson can be made smaller by the reduction in the number of lines.
Moreover, the shape of the Y spool 9 can also be determined easily. Therefore, it is possible to downsize the tree as a whole.

In addition, since the annual line 2 is merged with the service line 3, the connection line 10 to the flow line, which is branched at the Y spool 9, is connected to the service line 3.
The line 10w for connecting f to the wire line consists of only two lines, the production line 1 and the service line 3, but since the annual line 2 and the service line 3 are usually not used at the same time, the lower tree section By switching the 7l master valves ₅₂ and ₅₃ , service line 3
can be selectively used both as annual line 2 and as service line 3 itself.
Therefore, there will be no problem in normally performed flow line work and wire line work.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[Effects of the invention] As described above, according to the tree for the buried wellhead equipment of the invention, the annulus line and the service line are joined at the lower part of the Y spool, and the flow line connecting line and the wire are branched by the Y spool. Since each line connection line is configured with two lines, the number of lines can be reduced compared to the conventional one, making the diameter of the caisson smaller. Also, the shape of the Y spool can be easily determined, thereby reducing the size of the entire tree. be able to. In addition, since the lines that have been merged using the switching valve can be selectively made to function as either an annual line or a service line, flow line work and wire line work can be performed without any hindrance. It has a great effect.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing one embodiment of the tree for a buried type wellhead device of the present invention, and FIG. 2 is a system diagram of a conventional example. 1... Production line, 2... Annual line, 3... Service line, 5 ₁ , 5 ₂ , 5
₃ ...Master valve, 9...Spool, 10f...
...Line for connecting to the flow line, 10w...Line for connecting to the wire line.

Claims (1)

[Scope of utility model registration request] In a tree for a buried wellhead device, the production line, annual line, and service line passed through a caisson are branched by a Y spool into a line for connecting to a flow line and a line for connecting to a wire line. The annulus line is joined to the service line below the spool, and each connection line to the flow line and the wire line is configured as a production line and the joining line, respectively, and the joining line is connected to the service line. A tree for a buried wellhead device, characterized in that it is equipped with a switching valve for selectively functioning as an annulus line or a service line.