发明授权
- 专利标题: Downhole methods and assemblies employing an at-bit antenna
- 专利标题(中): 井下方法和采用位天线的组件
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申请号: US12919426申请日: 2008-12-16
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公开(公告)号: US08581592B2公开(公告)日: 2013-11-12
- 发明人: Michael S. Bittar , Clive D. Menezes
- 申请人: Michael S. Bittar , Clive D. Menezes
- 申请人地址: US TX Houston
- 专利权人: Halliburton Energy Services, Inc.
- 当前专利权人: Halliburton Energy Services, Inc.
- 当前专利权人地址: US TX Houston
- 代理机构: Krueger Iselin LLP
- 代理商 Benjamin Fite
- 国际申请: PCT/US2008/087021 WO 20081216
- 国际公布: WO2010/074678 WO 20100701
- 主分类号: G01V3/08
- IPC分类号: G01V3/08 ; G01V3/10
摘要:
Logging tools and methods employing an at-bit loop antenna to acquire azimuthal resistivity measurements proximate to the bit enable low-latency geosteering signals to be generated. In some embodiments, the at-bit antenna is part of a bottom hole assembly that includes a drill bit, a mud motor, and a resistivity tool. The mud motor is positioned between the at-bit antenna and the resistivity tool. The resistivity tool includes at least one loop antenna that is not parallel to the at-bit loop antenna. The at-bit antenna is part of an at-bit module that, in some embodiments, transmits periodic electromagnetic signal pulses for the resistivity tool to measure. In other embodiments, the at-bit module measures characteristics of electromagnetic signal pulses sent by the resistivity tool and communicates the measured characteristics to the resistivity tool via a short hop telemetry link.