A new solution for dynamic direction measurement while down-hole drill string rotating

In order to measure the gravity tool face in a real time and accurate manner during continuous rotation of down-hole drill string, this paper describes the basic parameters of track of hole attitude and basic principle of sensor to measure the attitude parameters in petroleum drilling; focuses on the structure of common directional sensor to measure the hole attitudes and measured parameters; provides a method for dynamic direction measurement while drill string rotation; analyzes in detail how to calculate the angle difference between the magnetic tool face and gravity tool face theoretically based on a principle of vector rotation, and the accuracy of calculation method is verified by experimental results. This method effectively overcomes the disadvantages of the large error in conventional gravity tool face measurements .This paper provides a measurement solution for tool face measurement during rotary steerable tool developing and continuous rotation of drilling tool.