A novel steering sections of hybrid rotary steerable system for directional drilling

As the conventional resource drains, the importance of unconventional resource grows. A directional drilling system and a hydraulic fracturing method are required to gain unconventional resources. Nowadays, the key technology of the directional drilling is a rotary steerable system (RSS). Among several types of the RSS developed so far, ‘point-the-bit’ and ‘push-the-bit’ are the most commonly used ones. In this paper, we introduce several conventional directional drilling methods and propose a new hybrid-type rotary steerable system. This mechanism improves the steering angle by taking advantages of both ‘point-the-bit’ and ‘push-the-bit’ types. Its control should be synchronized all 360° for BHA(Bottom Hall Assembly) heading due to the hybrid mechanism.