Abstract
Abstract Obtaining a smoother well bore path and reducing of drilling costs, through higher penetration rate and reduced trip frequency, are essential objectives of a technical innovation for horizontal and directional well drilling. In order to achieve these goals, a research project developing a remote controlled dynamic orientating system (RCDOS) for horizontal well drilling was organized and initiated by Japan National Oil Corporation (JNOC) in 1989. Originally, the project was composed of developing two sub-systems, a new deflection actuator and a new two-way telemetry system with a high bit rate. As the former could be used in combination with practical conventional mud pulse telemetry systems, it has lately become an independent target in the project. The deflection actuator is installed above a bit. The bending angle and bit tool face can be controlled independently and dynamically during the drilling process by the deflection actuator, from 0 to 1.5 degrees and 0 to 360 degrees respectively. Both tools for 8-1/2 and 12-1/4 inch bore holes have been developed. The deflection actuator is applicable for both rotary steerable and motor steerable drilling tools, and it consists of the following main components: communication terminal, seal mechanisms, pressure compensator, electromagnetic connector, reference stabilizer, high side sensor, RCDOS controller and bit drive-shaft bias unit. The bias unit is structured with Oldham couplings, electromagnetic clutches, positioning sensors for rotation angle detection, harmonic drive gears and double eccentric rings. It is a unique system for a drilling tool, because of its simple design principal and excellent performance. The RCDOS deflection actuator is the foundation of a new rotary steerable drilling tool currently under development (subject of future technical publications). In this paper, the fundamental work carried out for developing the RCDOS deflection actuator and verifying its performance is presented.
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