Installation method of riser clip on offshore jacket

Abstract

The invention discloses an installation method of the vertical pipe clamp of a jacket, which comprises the following steps: marking, clamp installation, swinging, initial installation, continued installation and wiring, wherein, in the step of the marking, a diver sets an underwater mapping and installation location; in the step of the clamp installation, in accordance with the measured sizes, a plurality of small clamps are fixed on the pipe at intervals, lifting points are provided on the pipe and large clamps are opened; in the step of the swinging, the pipes are lifted to the installation location and the driver is responsible for the underwater command that a windlass straighten the location of the pipe on a platform; in the step of the initial installation, the large clamps are fixed on a lacing pipe from bottom to top, the small clamps are opened and the pipes are lifted to the platform; in the step of the continued installation, the clamps at the higher installation position are installed in sequence by circularly carrying out clamp installation, swinging and initial installation; and in the step of the wiring, the pipelines are arranged into the small clamps.

Description

technical field [0001] The invention relates to a method for installing riser clips of a jacket, in particular to a post-installation method for "one pipe with multiple clips" riser clips of a jacket. The "one pipe with multiple clips" method is used to install the standpipe clips. Background technique [0002] The prior art jacket 2, such as figure 1 As shown, the jacket is composed of pile pipes 3 and tie pipes 4. The pile pipes 3 support the jacket 2 in the vertical direction, which can be 4, 6 or more. The pile pipes 3 are vertical on the left and right sides, but Slightly inclined forward and backward, so the jacket 2 is double-inclined, and also has a square top and bottom, and its height is about 90 meters. The tension pipes 4 are connected between the pile pipes 3. Obliquely, the quantity and structure of the pile pipe 3 and the tension pipe 4 mainly depend on the influence of meteorological factors such as load and sea waves and wind force during offshore operation...

AI Technical Summary

Problems solved by technology

[0005] In the installation method of the standpipe clamp of the prior art jacket, heliox diving is limited by its own characteristics, and the underwater operation time is very short. The diving operation time is generally 20 to 30 minutes, and the longer one is about 40 minutes. During the completion of the standpipe clip installation work, it is also necessary to adjust the elevation angle and left and right position of the standpipe clip. Most of the installation work requires continuous work, and the work efficiency is very low

Moreover, due to the low efficiency of heliox diving operation, the continuity of its operation will not be guaranteed, and the installation work is extremely difficult.

The standpipe clip is too heavy to be installed, and there are still problems in the installation work such as the pitch angle of the standpipe clip and the concentric adjustment of the left and right positions.

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