关键词: 旋转导向钻井工具, 测试元件, 导向控制, 井眼参数, 随钻测量

Abstract: The working principle and structure of a rotary steering drilling tool are introduced.The main technical properties of the tool are described.The tool mainly includes three parts: ①unit of stabilization platform;②unit for controlling and assigning working liquid;③unit of Push-the-Bit working structure.The wellbore data can be transmitted to measurement while drilling(MWD) unit from the test component in the tool through a short distance communication component and then transmitted to the instrument on ground by MWD unit.At the same time,the receiver in the component receives the instruction from the instrument on ground,and then control the high-pressure hole located on the upper plate hose by controlling and assigning working liquid with a controller in the stabilization platform unit.The unit for controlling and assigning working liquid takes the filtered mud as the working liquid distributed in three mud pipes in turn.The mud provides the "pad" with a motive force and maintains the direction of the join force on the position in accord with the high-pressure hole on the upper valve all the time.Thus there will form a side force near the bit flapping the wall of the well.The adjustment of the size and direction of the side force acted on the wall and the flapping frequency could directly control the steering state of the drilling tool.

Key words: rotary steering drilling tool, measurement unit, steering control, wellbore data, measurement while drilling