Application of leg RPD of jack-up drilling platform
Excessive legrack phase difference(RPD)value of jack-up drilling platform can lead to huge losses and casualties,due to excessive environmental load and poor seabed geological conditions under the working conditions of pile insertion,jacking,pre-ballast or jacking down.Based on introducing the definition,classification,calculation principle,force analysis,measuring method,causes,and over-standard hazard of RPD,this paper analyzed the over-standard RPD of a platform in detail and illustrated RPD setting value,positioning and pile insertion process,leg damage investigation,cause analysis of over-standard RPD value,and repairment of a case platform.At last,it was pointed out that the marine investigationreport,geologic investigationreport,pile insertion,and ballast scheme,as well as RPD risk control plan should be done before the platform was in positioning and pile insertion operation,jacking,jacking down,or preloading.In the case of"egg-shell"formation,single leg and multiple ballast or floating ballast should be adopted in ballast operation.Besides,effective measuresshould betaken about punch-through risk caused by excessive leginclination RPD and excessive platform inclination.
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