The Research On Application Of Simple Wellhead Platform With Suctionpile In Weizhou Bay

By lots of years exploration, many small and medium sized oil fields werediscovered in Chinese coastal waters. The characteristic of them is that many smalloilfields, oil widely distributed, small reserves or poor physical properties of crude oil,they are margin oil field. Through technological innovation to reduce costs is the bestway to these oil fields.For margin oil field, the way that the simple platform form, the least offshoreinstallation resources, the reusable structure could reduce the cost of fielddevelopment Significantly. By research for simple platform and suctionpile at homeand abroad, it can be found that may simple platform with suction pile have been usedin China or other countries. This accumulated experience for margin oil fielddevelopment.The article sums up the design theory and design methods for offshore oilplatforms and suction pile and introduces the design of WZ6-8oil fied which containwellhead support structure and platform with suction pile. The wellhead supportstructure increases the flexibility of drilling and completion, saves the cost ofmobilization and recovery for drilling rigs. The conductors are used to be pile forwellhead support structure. it changes the conventional concept of conductors andgives full play to the potential of conductors. Platform with suction pile saving theresource for installation in offshore, then saving the cost. Connect wellhead supportstructure with suction pile platform making the force more reasonable for structure.The article describes in detail the plan of installation. The installation ofwellhead support structure achieves that installation by a single vessel. As theabnormal ground conditions for platform, the installation of suction pile becomedifficulty. The article also analysis the reason for this phenomenon, and describe theplatform reinforcement program.Finally, the article use the professional marine engineering design softwareSACS do the detail analysis for the wellhead support structure and platform withsuctionpile. The main analysis have static analysis, seismic analysis, detailed fatigueanalysis. By this analysis, the safety and reliability is demonstrated in service duringthe period.