Invention Grant
- Patent Title: Electromagnetic and magnetostatic shield to perform measurements ahead of the drill bit
- Patent Title (中): 电磁和静磁屏蔽在钻头前进行测量
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Application No.: US12401440Application Date: 2009-03-10
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Publication No.: US07994790B2Publication Date: 2011-08-09
- Inventor: Gregory B. Itskovich , Roland E. Chemali , Tsili Wang
- Applicant: Gregory B. Itskovich , Roland E. Chemali , Tsili Wang
- Applicant Address: US TX Houston
- Assignee: Baker Hughes Incorporated
- Current Assignee: Baker Hughes Incorporated
- Current Assignee Address: US TX Houston
- Agency: Mossman Kumar & Tyler PC
- Main IPC: G01V3/08
- IPC: G01V3/08 ; G01V3/10
Abstract:
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.
Public/Granted literature
- US20090237084A1 Electromagnetic and Magnetostatic Shield to Perform Measurements Ahead of the Drill Bit Public/Granted day:2009-09-24
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