E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
33/91
E21B 47/02 (2006.01) G01C 7/06 (2006.01)
Patent
CA 1284426
ABSTRACT OF THE DISCLOSURE A change in curvature or displacement of a section of submarine or subterranean fluid transmission pipeline is measured by traversing the pipeline with a pig having an onboard instrument package, including accelerometers and a longitudinal position measuring device comprising a magnetometer for counting the girth welds or other known magnetic anomalies along the section of pipeline to be measured. The accelerometers are mounted at the central longitudinal axis of the pig which is substantially coinci- dent with the central longitudinal axis of the section of pipeline being measured so that the roll attitude of the pig does not influence the signals generated by the accel- erometers. This arrangement precludes the requirement of mounting the accelerometers on a gyroscopic stabilized platform since the absolute position of the pig in space is not required, but primarily the change in curvature or displacement of the pipeline from a predetermined course is what is desired to be known. The pig weight is mini- mized and supporting structure is sufficiently stiff as to provide natural modes of vibration at frequencies higher than the frequencies of signals of interest as the pig traverses the pipe.
555216
Lara Pedro F.
Atlantic Richfield Company
Lara Pedro F.
Osler Hoskin & Harcourt Llp
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