发明申请
- 专利标题： Electromagnetic and Magnetostatic Shield to Perform Measurements Ahead of the Drill Bit
- 专利标题（中）： 电磁和静电屏蔽在钻头前进行测量
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申请号： US12401440申请日： 2009-03-10
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公开(公告)号： US20090237084A1公开(公告)日： 2009-09-24
- 发明人: Gregory B. Itskovich , Roland E. Chemali , Tsili Wang
- 申请人： Gregory B. Itskovich , Roland E. Chemali , Tsili Wang
- 申请人地址： US TX Houston
- 专利权人： Baker Hughes Incorporated
- 当前专利权人： Baker Hughes Incorporated
- 当前专利权人地址： US TX Houston
- 主分类号： G01V3/18
- IPC分类号： G01V3/18
摘要：
A transmitter on a bottomhole assembly (BHA) is used for generating a transient electromagnetic signal in an earth formation. A pair of receivers on the BHA receive signals that are indicative of formation resistivity and distances to bed boundaries. A time dependent calibration factor or a time-independent calibration factor may be used to combine the two received signals and estimate the distance to bed boundaries that are unaffected by the drill conductive body. Further improvement can be obtained by using copper shielding.
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