WELL FIELD THREE-DIMENSIONAL DRILL STRING VIBRATION SIGNALS' PERIODIC VIBRATION NOISE SEPARATION METHOD RESEARCH
WU Haocheng, Yongshou Dai, Sun Weifeng, Ligang Li, Yanan Zhang · 2013
The effect of periodic vibration noise in wellsite is an important factor which impact analysis on three-dimensional drill string vibration signal. In order to obtain more accurate characters of three-dimensional drill string vibration signal tha t reflects the drilling tools condition, we conduct researches on the periodic vibration noise in the w ellsite, independent component analysis algorithm w hich based on negative entropy for periodic vibration no ise signal separation was adopted. At the same time , in order to improve the effect of algorithm demixing, an improved Particle Swarm Optimization algorithm was introduced, combining with periodic noise components which exist in three directions of drill stri ng vibration signals to seek the optimal mixed matrix by which can structure multi-channel mixed-signal o f independent component analysis algorithm. This method has high similarity after separation each signal components, in operation has high efficiency. Throu gh the experimental simulation, the method was proven feasible in the drill string vibration periodic noi se signal separation.