Development and application of a downhole control unit for offshore drilling;

Its history of using sea water drilling fluid technology in offshore drilling can be divided into several stages.

To prevent drilling tool collapse and inclination caused by hurricane on platfor m or to prevent accidents of kick or blowout induced by cement plug leakage within the wellbore, a special downhole tool, the downhole control unit used for offshore drilling of temporary shutdown for hurricane proof is develop ed.

Simplified calculation of natural frequencies for marine drilling risers;

Offshore drilling fluid should have environmentally friendly properties as well as good conventional properties.

Learning foreign successful experiences and considering the research status on offshore drilling field at home and abroad,some advices for offshore drilling fluid research were proposed.