Treatment and Recognition of Surface Tubing of Semi-submersible Platform

The complicated situation of tubing during the casing running is one of the major problems in the drilling operation of the semi-submersible drilling platform. During the operation of a semi-submersible drilling platform, if the casing cannot be lowered in place, the next step of the operation will not be carried out. The processing difficulty and risk are much higher than those of the fixed drilling platform. This article took a case of a ϕ339.7 mm casing on the surface of a semi-submersible drilling platform in the Enping Block in the eastern South China Sea from the occurrence of tubing to the rapid release of the jam as an example. It carried out specific analysis from the aspects of formation characteristics, drilling fluid performance, and well structure, and put forward quick treatment methods and preventive measures for the surface pressure difference of the semi-submersible drilling platform. It has reliable reference and guiding significance for the follow-up prevention and treatment of surface pressure difference tubing.