Extracting of Near-bit Attitude Signals Using DWT

Steerable drilling is the key technology in oil/gas drilling development. However, the near-bit measurements are usually contaminated by noises resulting from drilling tool vibration and high-speed rotary. This study proposes a new extraction scheme, which can remove the vibration and rotary noises powerfully and extract the useful gravity measurements based on the discrete wavelet transform. Illustration examples are provided to verify the effectiveness and usefulness of our proposed measures.