A Weak SNR Signal Extraction Method for Near-Bit Attitude Parameters Based on DWT

Abstract

In practice, the near-bit signals are usually accompanied by noises generated by drilling tool vibration and high-speed rotary. This study introduces discrete wavelet transform to a well drilling area and presents a new weal signal extraction algorithm, which can eliminate the vibration and rotary noises effectively and obtain the useful gravity attitude signals based on the discrete wavelet transform through a hard threshold method. The effectiveness and usefulness of our method are verified via Matlab simulation and actual drilling data.

Keywords

• near-bit attitude parameters
• drilling tool vibration
• high-speed rotary
• weak signal extraction
• discrete wavelet transform