COSL completes first offshore drill with self-developed rotary drilling system

Welleader is a rotary steering drilling system that the company has been developing in house for a period of five years since 2008, with full intellectual property right.

It represents a breakthrough in the monopoly of technologies by products of this kind originated from the overseas.

On a foundation established by previous onshore tests, this operation has adopted the company's self-developed logging while drilling system Drilog, together with Welleader, assembling a solution that performs electromagnetic wave resistivity and natural gammy ray logging functionality, making remote real-time transmission of geosteering data possible.

The Welleader system has delivered outstanding performances, according to COSL. It has gone through the sandstone and mudstone strata in a well, performed high-speed rotary directional drilling throughout the whole process, thereby guaranteed accuracy of the trajectory and lifted the overall efficiency of the drilling operation.