JPS60113881A - Support structure of interior pipe of riser pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inner pipe support structure for supporting an inner pipe of a riser pipe used for mining oil, gas, etc. on the seabed at an intermediate portion.

Lysavibe connects a seabed wellhead with offshore facilities such as a drilling ship, support ship, or platform, and is used by connecting many of them in the axial direction. This riser pipe consists of two large-diameter production pipes that serve as transportation paths for oil, etc., and a large number of small-diameter production pipes (12 on the left side) that are hydraulic pressure pipes for remotely controlling valves, etc. of wellhead equipment. Control pipe 2, type □; Put the Japanese inner pipe inside the outer cylinder,
Both end portions 1 of the outer cylinder are constructed so as to extend parallel to each other between both end supports attached to each other.

Riser pipes such as R are directly exposed to harsh natural conditions such as waves and ocean currents, and are constantly subject to repeated bending and vibration. There is a risk that the inner tube and outer tube will collide with force f and be damaged. For this reason, conventionally, the middle part of the inner pipe is supported at several locations by disk-shaped pipe supports that have pipe holes through which the inner pipe is inserted.The following is a specific example of this support structure. Two sides are known.

One is Production 7N11, as shown in Figure 5.
This structure is such that a nozzle support C through which a control pipe A and a control pipe B pass is fixed to the pipes A and B with bolts D. E is an outer cylinder. However, according to this structure, the vibrations of pipes A and B damage the contact surfaces of pipes A and B with bolt D, and the contact surfaces are worn, causing bolt D to loosen prematurely and pipe support C to fall. There were drawbacks such as.

The other is Nonobu A, as shown in Figure 6.

B to 7 N041 through hole Ci of pipe support C,
Overlap C2 + slack 11, and insert a 2-split truncated conical holder made of elastic material such as rubber into the gap between the pipe through holes C1 and C2. #d!-) C4-fixing structure.G is a holder presser.When using this structure-1, pipe A
Although it is possible to prevent damage to the supports r and c'p from falling off, the work of attaching the pipes, especially the 5 and 1 rudders F, is troublesome and the ease of assembly is poor. Using F increases the cost.

Additionally, both structures have the following common drawbacks. In other words, in order to avoid applying compressive or tensile stress to the inner tube due to differences in the radius of curvature between the outer tube and the inner tube when the entire riser pipe is bent, one end of each inner tube is placed against one end support. Although it is preferable to support the inner pipes so as to be slidable in the axial direction, if the inner pipes A and B are uniformly fixed to the pipe support C by bolts D or holders F as described above, each inner pipe A may be supported.

Even if one end of B is slidably supported as described above, the inner pipes A and B are restrained in the axial direction by the pipe support C, and this is particularly true when the inner pipes have different expansion and contraction ratios. Compressive or tensile stress will be applied. Furthermore, for both structures, when installing the support C, the installation interval was measured 1. Since the position must be determined from ÷6, the assembly will be ml'4 or worse.

i, M trowel The present invention makes pipe support easy and efficient.
-1be, and in a stable condition with no risk of falling □7
．． It can be installed in a vertical position and has a high inner pipe.
Method 2: To obtain an inner pipe support structure for a riser pipe that can obtain a 100-degree sowing effect and also allow the inner pipe to move in the axial direction.
It is something to do.

A feature of the present invention is that a pipe support is provided with a large-diameter pipe passage hole for a production pipe on the center side and a small-diameter pipe passage hole for a control pipe on the outer circumferential side. A pair of semicircular support plates forming the pipe support are formed by dividing the hole into two halves, and a pair of semicircular support plates are arranged parallel to the inner pipe group at the center of the inner pipe group. The bar and the production pipe are mounted in a tall shape on a support bar having a circumferential groove at a predetermined position so as to be sandwiched from both sides in the radial direction, and both support plates are sandwiched and fixed between a pair of support holders. It consists in the inner pipe support structure of the riser pipe.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4.

1 is an outer cylinder, 2 and 6 are end supports fixed to both ends of this outer cylinder 1, and these both end supports t: "12
The inner pipe group is placed between 1 and 3, and the two large-diameter pipes are placed on the center side, -
Function pipes 4, 4, and a total of 12 small-diameter control pipes 5 on the outer circumferential side are arranged parallel to each other.
The intermediate part of this inner pipe group is spaced at regular intervals with multiple
Pipe support 6 (therefore, it is supported).

, i. This pipe support 6 is formed into a two-part shape consisting of a pair of semicircular support plates 6a and 6b.

Both support plates 6a and 6b are each provided with six small-diameter pipe through holes 7 for control pipes, and large-diameter semicircular notches 8 on both sides of the surfaces to be joined.
a, 8b, small diameter semicircular notches 9a, 9b are provided at the center of the same plane, and both supports 6a.

By joining 6b in the radial direction, 12 small-diameter pipe through holes 7... and two large-diameter pipe through holes 8,8,
A disk-shaped pipe support 6 having a center hole 9 is formed therein. Reference numeral 10.11 denotes a pair of support holders for fixing both support plates 6a and 6b in the above-mentioned joined state.Both port holders 10 and 11 have exactly the same arrangement, number, and diameter dimensions as the pipe support 6, and have a small diameter. Pipe through hole 12
. . . Large diameter pipe through holes 1 and 1 and a center hole 14 are provided. Reference numeral 15 denotes a support bar, and the bar 15 passes through the center hole 9 of the pipe support B, and one end is fixed to the L end support 2, and the other end is fixed to the template 16, and the pipe support 6 is supported by this support par 15. Ru. The support par 15) and each part where the pipe support 6 is installed (.

6. The support 6 engages the circumferential groove 15a with a width.
It is set up.

-1': Next, the assembly procedure will be explained.

11 (a) End support 2 on the other side [left side of figures 1 and 2]
Support par-15 and production pipe 4,
Screw one end of 4 to secure.

(O) At the portion of the support par 15 where the circumferential groove 15a is provided, a pair of support plates 6a and 6b constituting the pipe support 6 are inserted between the bar 15 and the production pipes 4, 4 from both sides in the radial direction. Joined in a tally shape. In this state, as mentioned above, both support plates 6
Two types of semicircular notches a and 6b sa, abg yohi 9a
, 9b form two large diameter pipe passage holes 8, 8 and a center hole 9, and the production pipes 4, 4 pass through the large diameter pipe passage holes 8, 8, and the support par 15 passes through the center hole 9. The state will be as follows. In addition, both support plates 6aT
6b becomes immovable in the axial direction by engaging with the circumferential groove 15a of the support parr 15.

No. 0 Of the pair of support pressers io and il, one of the support pressers 10 is fitted with the support 1 bar 15 and the production pipe 4 in the step before (b) above, and after (b) Place one support presser foot 1121 (
Fit in the same way. The support plates 6a and 6b are sandwiched between the two port holders 10 and 11, and the three layers and the body are connected using a plurality of bolts 1, 7 and nuts 18. As a result, both the support plates 6'a and 6b are fixed in a joined state with the upper supply port) to form a disk-shaped pipe support 6.

) The small diameter pipe through holes 7 of the thus assembled pipe support 6'B and both side support pressers i o and i'i
, 12 . . . and one end thereof is screwed and fixed to one end support 2 in the same way as the production pipe.

(e) Attach the template 16 to the other end of the support par 15, production pipe 4°4, control pipe 5... This template 16 has small-diameter and large-diameter pipe through holes 1 as well as support pressers 1o and ii.
9, 19, 20, . . . have a center hole 21, and each pipe 4, 4.degree. A stepped portion 15b is provided at the end of this support par 15, and this stepped portion 15b
With the template 16 locked in place, use the template presser 22 to fix it. With this, support par 15
The same pipe group 4, 4.5 is fixed to the center of the pipe 04, 4.5 with both end supports 1iii,
The relevant end of...Ah, is positioned relative to the 4-nd plate B.

(f) Inner pipe positioned and assembled in this way -'
The riser pipe is assembled by inserting and supporting the end portions of the pipe groups 4, 4, 5, etc. of the pipes 4, 4, 5, .

When this internal pipe support structure is used, the pipe support 6 is engaged with the circumferential groove 15a of the support par 15 so that it cannot be moved in the axial direction. 4.5 There is no need to fix the shaft in the axial direction at all. For this reason, the drawbacks of the conventional structure caused by the axial fixation of supports for this group of pipes, namely, the damage to pipes A and B caused by bolt D in the case of the conventional structure shown in FIG. 5, and the support caused by loosening of bolt D. It is possible to eliminate the disadvantages such as slippage of the holder F, deterioration of assembly workability due to the use of a large number of holders F in the conventional structure shown in FIG. 6, and increase in cost. In addition, since the pipe groups 4, 4, 5, etc. are not restricted in the axial direction by the support B and can freely move in the axial direction, the pipe groups 4, 4, 5, ... 1 yen; Value ◇ Is it 8 where compressive or tensile stress acts? This eliminates the hassle of positioning the supports while measuring the support spacing, making the assembly process even more efficient.

First, both ends of the production pipes 4, 4 are formed to have a large diameter as shown in the drawing in order to attach the sealing member and maintain strength. For this reason, in the case of a conventional configuration in which the production pipe is passed through the pipe support in the axial direction, the pipe through hole should be set to have a diameter larger than the diameter of the middle part of the pipe, in line with the large diameter part (amplifier set part). Must be.

As a result, a large gap is created in the part where the pipe is inserted into the support, resulting in a poor support effect.

On the other hand, when using this structure, instead of inserting the production pipes 4, 4 through the pipe support B in the axial direction, the two-piece pipe the port 6 is fitted into the pipes 4, 4 in the radial direction. Because of this, pipe through hole 8,
8 is well matched to the diameter of the intermediate portion of the pipe, and therefore no unnecessary gaps as described above are created.8 Therefore, the support effect of the production pipes 4, 4 is high.

By the way, in the above embodiment, the second end of the support par 15 is constructed such that it is installed at the center of the pipe L with the other end fixed to the template 16 for positioning the pipe mld1 on one end support 2. But this support-bar 15
may be installed between the end supports 2 and 6 on both sides.

As described above, according to the present invention, the pipe the port formed in two halves is used as a support par, and the bar and O.
Since the structure is such that the large-diameter production pipe is sandwiched between both sides in the radial direction, and is mounted in such a manner that it cannot be moved in the axial direction only with respect to the bar due to the circumferential groove of the support bar, the pipe support is ) It can be installed efficiently and in a stable condition without the risk of falling off, and it can provide a very effective inner pipe support effect. Furthermore, since the support does not restrict the movement of the inner tube in the axial direction, it is effective in alleviating the tensile and compressive stress of the inner tube.

[Brief explanation of drawings]

1 to 4 show an embodiment of the present invention, FIG. 1 is a longitudinal cross-sectional side view of the entire riser pipe taken along line I-I in FIG. 6, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. Figure 6 is the longitudinal front view 1,
Figure 4 is a perspective view of Pipe the Port, etc. Figures 5 and 6
The figure shows the conventional two sides, y (longitudinal side view).
...7″P extension pipe, 5…control pipe, 6-pipe support, 6a, 6b…semicircular support plate, 7-…small diameter pipe through hole, 8…
Large diameter pipe passage: Spoon, 10.11...Support presser,
15... Support, bar, 15a... Circumferential groove.

Claims (1)

[Claims] 1. The large-diameter production pipe is placed on the center side, and the small-diameter control pipe is placed on the outer circumferential side, and the middle part of the inner pipe group is constructed between end supports on both sides. A pipe passage hole is provided in the pipe support, and the pipe support is inserted into the pipe support structure. The large-diameter pipe passage hole is divided into two parts, and a pair of semicircular supports forming this one pipe support are parallel to the inner pipe group at the center of the inner pipe group. The bar and the production pipe are mounted on a support bar disposed in the support bar from both sides in the radial direction, and both Zaport plates are sandwiched and fixed between a pair of support holders, and An inner pipe support structure for a Lysavibe, characterized in that the bar is provided with a circumferential groove that engages and holds the pipe support in an axially immovable manner at a portion where the pipe support is mounted.