流动地震仪检测钻头振动信号的现场试验

钻井过程中钻头对井底的冲击振动为钻头前方地层的探测提供了震源，可用来消除钻井过程中的地质不确定性和降低钻井风险.本研究在分析井下钻头振动信号特点的基础上，根据现代地震观测技术的新发展，将多道勘探地震仪和流动数字地震仪的性能进行了对比分析，将天然地震的观测设备和分析方法应用到随钻地震检测中，提出了一套新的随钻地震检测方案，利用高灵敏度流动数字地震仪连续检测钻井过程中的钻头振动信号，初步现场试验表明该技术方案可行，获得的信号信噪比高，易于钻井工程师掌握，为随钻地震技术提供了新的技术路线.

Field test of the drill-bit vibration signal detection using portable seismometers

It is a important way to explore the undrilled formations by recording the drill-bit vibration signal while drilling,namely SWD.SWD is helpful to eliminate the geological uncertainty and potential hazard.By analyzing the signal characteristic of the drill-bit vibration and performance difference of traditional multi-channel geophones instrument and the portable digital seismometers,we proposed a new way to detect the seismic signal while drilling.In it the advanced portable seismometers are used as transducers in a array.Seismometers with high sensitivity will record the vibration signal continuously while drilling.The preliminary field experiment shows this SWD scenario is feasible.The signal to noise ratio(S/N) obtained by seismometers is higher than geophones.This new approach can be operated easily by drilling engineers and opens a new way to the SWD technique.