Automatic control methods for positioning the lower end of a filiform structure, notably an oil pipe, at sea
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United States of America Patent
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Jun 27, 2006
Grant Date -
Dec 1, 2005
app pub date -
Jun 10, 2004
filing date -
Jun 11, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Method intended for automatic control of an underwater pipe for connecting the lower end of the pipe to a wellhead, wherein the following stages are carried out: Stage 1: determining a mathematical model expressing the position of the lower end of the pipe as a function of the position of the upper end of the pipe, Stage 2: determining a reference path leading to the wellhead, Stage 3: from the mathematical model determined in stage 1, determining control laws allowing to control the path of the lower end of the pipe, Stage 4: applying determined motions to the upper end of the pipe so that the position of the lower end is as close as possible to the reference path determined in stage 2.
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