Research On Condition Monitoring Technique Of Large Deepwater Production Facilities In Site Translation

With dramatic increase of global energy demand, oil and gas offshoreexplorations in shallow sea have been extended to deep-sea and ultra deep-sea. oilproduction facilities are being more and more widely used, large scaled andcomplicated in structure. Construction workshop of large scaled deepwater productionis normally constrained by lifting, transportation and other factors. Generally, theseequipments are made in port areas and after being assembled, they are moved toloading on ships and go to the destinations by shipping. Nowadays, sliding-move isthe most popular and matured technology in our country. Due to their large-tonnagecharacter of these equipments, it requires high carrying capacity, compression strengthto the port during sliding-motion. However, most of ports in our country are lowstandard which were built decades ago. It might bring safety risks if over loadingoccurs in these ports. Previous researches usually focused on the safety of equipmentstructures, and seldom considered the safety of land in the port during sliding-motion.In order to guarantee the safety of hugely scaled structures during sliding-motion, it ispertinent to investigate the dynamic health monitoring of working land. This paperfocuses on working land monitoring during sliding-motion of large scaled deepwaterproductions. The major contents are listed below:(1) In order to theoretically guarantee the safety of working land duringsliding-motion, this paper conducted the finite element modeling of CEP (CentralPlatform) module, DSF (Drilling Barge Support Facility), slide area and non-slideareas in the port and calculated the strain, stress and settlement displacement ofworking land during sliding-motion of CEP module;(2) Monitoring stress-strain of slide beam can afford theoretical proof to the stateof working land in indirect real time monitoring by setting the sensors in stressconcentrating areas of slide beam, slide area and non-slide working land in the portand fitting the relational curve between measuring points in sliding beam andstrain-stress in working land using least square method;(3) Aiming at condition monitoring of the5th slide site, conducting monitoringscheme designing and hardware selection based on measuring principle of opticalfiber strain sensor, and then designing the software of monitoring system based on the LabVIEW platform to realize real time stress-strain monitoring on stress-strainconcentrated points in working land, to provide alerts and to save the measured data;(4) Conducting the experiment for indirect monitoring of working land stateadvanced in this paper, and stress-strains of small high-precision weighting andhydro-driven lifting roller ship experimental platform are indirectly monitored, thendirectly measured data and indirectly measured data are compared with that oftheoretically calculated, it will successfully prove the feasibility and accuracy of theadvanced indirect monitoring method of working land state in this pape.Above all, during the sliding-move of large scaled oil explorationequipment(CEP module), the advanced approach by indirect monitoring ofstress-strain to working land is of great meaning in real engineering application.