套管头振动信号特征应用于油井防碰监测的可行性分析

Feasibility analysis on application of casing head vibration signal in wellbore anti-collision monitoring

提出了一种井间防碰监测的新方法,即利用在风险井套管头上安装的传感器监测由套管传输到地面的钻头振动信号,分析振动波在地层和风险井套管中的传播规律,进而预测钻头是否趋近风险井套管,并评估钻头距风险井套管间的相对距离。分析结果表明:在钻井钻头振动诱发的风险井套管头振动信号存在一个特征频率段,在钻井钻头破岩诱发的风险井套管头振动信号特征与在钻井钻头距风险井套管间的距离有明确的对应关系,因此利用风险井套管头振动信号预测在钻井钻头趋近的方法对加密调整井进行防碰监测,这在技术思路上是可行的。

A new wellbore anti-collision monitoringmethod is presented, which uses the sensor in- stalled on casing head of risk well to monitor the drill bit vibration signal transmitted by the casing, analyzes the propagation pattern of vibration wave between formation and risk casing, forecasts the drill bit approaching the risk casing and evaluates relative distance between drill bit and the risk casing. The a- nalysis results show that the risk casing head vibra- tion signal induced by bit cutting rock has a charac- teristic frequency range and the vibration signal char- acteristics are related with the distance between drill bit and the risk casing definitely. So, it is feasible to apply this method in wellbore anti-collision monito- ring during drilling infill wells.