公开(公告)号：US20170350233A1

公开(公告)日：2017-12-07

申请号：US15667954

申请日：2017-08-03

申请人： Schlumberger Technology Corporation

发明人： Hong Zhang ,  Luis E. Depavia

IPC分类号： E21B47/09 ,  G01V3/28

CPC分类号： E21B47/0905 ,  G01V3/28

摘要： A tool for detecting a structure in a well includes a receiver coil having a first winding and a second winding, a first circuit to apply an input signal to the second winding, and a detection circuit to detect a response of the first winding to the input signal applied to the second winding. The response of the first winding indicates presence of the structure in the well if the receiver coil is positioned proximate the structure. The depths (or locations) of these structures are used to avoid placing receivers near these structures for EM induction surveys, such as cross-well, surface-to-wellbore, or single-wellbore induction loggings with receivers in metallic casing.

公开(公告)号：US09638028B2

公开(公告)日：2017-05-02

申请号：US14470227

申请日：2014-08-27

申请人： Schlumberger Technology Corporation

发明人： Guozhong Gao ,  Luis E. Depavia

IPC分类号： E21B47/12 ,  G01V3/02 ,  G01V3/08 ,  G01V3/28

CPC分类号： E21B47/121 ,  G01V3/28 ,  Y02A90/344

摘要： A method for signal communication between a well drilling instrument and the Earth's surface includes generating an electromagnetic field in an instrument disposed in drill string used to drill a wellbore. The electromagnetic field includes encoded measurements from at least one sensor associated with the instrument. A signal corresponding to an amplitude of the electromagnetic field is measured and the measurements from the measured signal are decoded. The signal comprises a voltage measured across electrodes or a voltage induced in an electromagnetic receiver disposed at a selected depth below the Earth's surface. The selected depth is at least the depth of a formation below the water table having a highest resistivity within 500 meters of the surface.

公开(公告)号：US20160061027A1

公开(公告)日：2016-03-03

申请号：US14470227

申请日：2014-08-27

申请人： Schlumberger Technology Corporation

发明人： Guozhong Gao ,  Luis E. Depavia

IPC分类号： E21B47/12 ,  G01V3/08 ,  G01V3/02

CPC分类号： E21B47/121 ,  G01V3/28 ,  Y02A90/344

摘要： A method for signal communication between a well drilling instrument and the Earth's surface includes generating an electromagnetic field in an instrument disposed in drill string used to drill a wellbore. The electromagnetic field includes encoded measurements from at least one sensor associated with the instrument. A signal corresponding to an amplitude of the electromagnetic field is measured and the measurements from the measured signal are decoded. The signal comprises a voltage measured across electrodes or a voltage induced in an electromagnetic receiver disposed at a selected depth below the Earth's surface. The selected depth is at least the depth of a formation below the water table having a highest resistivity within 500 meters of the surface.

摘要翻译： 用于钻井仪器与地球表面之间的信号通信的方法包括在设置在用于钻井筒的钻柱中的仪器中产生电磁场。 电磁场包括与仪器相关联的至少一个传感器的编码测量。 测量对应于电磁场幅度的信号，并对来自被测信号的测量进行解码。 该信号包括跨电极测量的电压或者设置在地球表面以下选定深度处的电磁接收器中感应的电压。 所选择的深度至少是表面500米内具有最高电阻率的水位下方的地层深度。