Invention Grant
- Patent Title: Active damping for NMR logging tools
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Application No.: US15765245Application Date: 2016-09-08
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Publication No.: US10677956B2Publication Date: 2020-06-09
- Inventor: Krishnamurthy Ganesan , Soumyajit Mandal , Van D. M. Koroleva , Gabriela Leu , Payam Tabrizi , Nicholas Heaton , Martin D. Hurlimann , Yi-Qiao Song
- Applicant: Schlumberger Technology Corporation
- Applicant Address: US TX Sugar Land
- Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
- Current Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
- Current Assignee Address: US TX Sugar Land
- International Application: PCT/US2016/050606 WO 20160908
- International Announcement: WO2017/058482 WO 20170406
- Main IPC: G01V3/32
- IPC: G01V3/32 ; G01R33/44 ; G01R33/36 ; E21B47/12 ; G01V3/38

Abstract:
A method for measuring one or more properties of a formation includes applying a magnetic field to a subterranean formation using a downhole tool. A radiofrequency signal is transmitted into the subterranean formation that is exposed to the magnetic field. The radiofrequency signal induces a transverse magnetization in the subterranean formation, and the transverse magnetization induces an initial voltage signal in the downhole tool. The initial voltage signal is amplified using a first amplifier in the downhole tool such that the first amplifier outputs a first amplified voltage signal. The first amplified voltage signal is introduced to an input of the first amplifier, such that the first amplifier amplifies the first amplified voltage signal and outputs a second amplified voltage signal.
Public/Granted literature
- US20180299579A1 ACTIVE DAMPING FOR NMR LOGGING TOOLS Public/Granted day:2018-10-18
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