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地质导向就是应用实时地质评价数据,主动对井眼轨迹进行控制,以保证钻井成功中靶,提高油层的钻遇率。而传统的随钻测量波形传输仪器只能采集到井眼周围的平均电阻率数据,没有任何方向性。在理想条件下,能探测6m范围的方位电阻率测井仪被加到底部钻具总成上。深度电阻率测井仪、常规传播电阻率测井仪和方位电阻率测井仪的组合有助于确定油井在油层的最佳产油位置,并能在复杂环境下进行地质导向。尤其是这种测试组合能区别泥岩是来自于测试仪之上还是来自于测试仪之下。文章介给出三种仪器在北海油田应用的实例。
Geological steering is the application of real-time geological evaluation data, take the initiative to control the trajectory of the well to ensure successful drilling target, improve the drilling rate of the reservoir. The traditional MWD waveform transmission instrument can only collect the average resistivity around the borehole data, there is no directionality. Under ideal conditions, azimuthal resistivity logging tools capable of detecting 6m range are added to the bottom hole assembly. The combination of depth resistivity tools, conventional propagation resistivity tools and azimuthal resistivity tools helps to determine the best production location of the well in the reservoir and enables geosteering in complex environments. In particular, this combination of tests makes it possible to distinguish whether the mudstone came from above or below the tester. The article presents three examples of applications in the North Sea oil field.