Study of adaptability evaluation technology of marine drilling risers;

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;