A method for auxiliary measurement of riser angle

By using an angle measuring instrument and magnetic anchors for clamping bases in the installation of expansion bends in subsea pipelines, the problem of installation delays caused by riser angle deviations was solved, enabling rapid and accurate riser angle measurement and improving installation efficiency.

CN122130033APending Publication Date: 2026-06-02SHENZHEN OFFSHORE OIL ENG UNDERWATER TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHENZHEN OFFSHORE OIL ENG UNDERWATER TECH CO LTD
Filing Date
2026-01-20
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

In the installation of expansion bends in subsea pipelines, deviations of the riser angle from the design angle lead to delays in installation efficiency, and there is a lack of reference points and experience for underwater adjustments.

Method used

The clamping bases of the first and second angle measuring instruments are fixed on the horizontal straight pipe section and the riser, respectively. The measuring module is connected by a steel wire rope to calculate the actual deviation angle of the riser. The magnetic anchor and bolts of the clamping base are used to adjust the fixed position to realize underwater operation.

Benefits of technology

It enables rapid and accurate measurement of riser angle deviation at any location, improving the efficiency of subsea pipeline expansion bend installation and simplifying the underwater adjustment process.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention discloses an auxiliary method for measuring riser angles. The method involves placing a first clamping base of a first angle measuring instrument on a horizontal straight pipe section, with the first measuring module of the first angle measuring instrument positioned above the horizontal straight pipe section. A second clamping base of a second angle measuring instrument is placed on the riser, with the second measuring module of the second angle measuring instrument positioned above the horizontal section of the riser. A steel wire rope is connected between the first and second measuring modules and tightened. The first angle of the first measuring module and the second angle of the second measuring module are read. The first and second angles are subtracted from 180 degrees to obtain a third angle. The third angle is then subtracted from 90 degrees to obtain a fourth angle, which is the actual deviation angle of the riser and is denoted as the fifth angle. This invention provides an auxiliary method for measuring riser angles by connecting a steel wire rope to the measuring modules, measuring the angles, and calculating the deviation angle of the riser.
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