发明授权
- 专利标题: Surface to borehole electromagnetic surveying using metallic well casings as electrodes
- 专利标题(中): 使用金属井壳作为电极的表面到井眼电磁测量
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申请号: US13131219申请日: 2009-10-22
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公开(公告)号: US09069097B2公开(公告)日: 2015-06-30
- 发明人: Hong Zhang , Richard A. Rosthal
- 申请人: Hong Zhang , Richard A. Rosthal
- 申请人地址: US TX Sugar Land
- 专利权人: Schlumberger Technology Corporation
- 当前专利权人: Schlumberger Technology Corporation
- 当前专利权人地址: US TX Sugar Land
- 代理商 Cathy Hewitt; Michael Dae
- 国际申请: PCT/US2009/061588 WO 20091022
- 国际公布: WO2010/065208 WO 20100610
- 主分类号: E21B43/00
- IPC分类号: E21B43/00 ; G01V3/28 ; E21B47/12
摘要:
Methods and related systems are described for making measurements of an electromagnetic field in a subterranean formation that has been induced by a current loop. The current loop uses one or more steel wellbore casings as electrodes. Receiver arrays are positioned either at surface/seafloor, in the same, or in nearby wells. In the most general case, the receivers are tri-axial. A section of metallic casing in one well can be used as a current source and the electromagnetic field at surface can be measured using an array of EM receivers placed at a range of distances from the wellbore.