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公开(公告)号：US10677956B2
公开(公告)日：2020-06-09
申请号：US15765245
申请日：2016-09-08
Applicant: Schlumberger Technology Corporation
Inventor： Krishnamurthy Ganesan , Soumyajit Mandal , Van D. M. Koroleva , Gabriela Leu , Payam Tabrizi , Nicholas Heaton , Martin D. Hurlimann , Yi-Qiao Song
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.
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公开(公告)号：US20180299579A1
公开(公告)日：2018-10-18
申请号：US15765245
申请日：2016-09-08
Applicant: Schlumberger Technology Corporation
Inventor： Krishnamurthy Ganesan , Soumyajit Mandal , Van D. M. Koroleva , Gabriela Leu , Payam Tabrizi , Nicholas Heaton , Martin D. Hurlimann , Yi-Qiao Song
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
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公开(公告)号：US10001578B2
公开(公告)日：2018-06-19
申请号：US14272325
申请日：2014-05-07
Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION
Inventor： Soumyajit Mandal , Van D. M. Koroleva , Troy Borneman , Martin D. Hürlimann
Abstract: A method for applying a nuclear magnetic resonance (NMR) sequence is described herein. The method includes applying a series of refocusing pulses to a substance within an inhomogeneous static magnetic field. Each refocusing pulse in the series of refocusing pulses includes a central axis, a total pulse duration greater than t180, and at least five segments (e.g., 5, 7, 11, 20, and 21). The phase of each segment is substantially anti-symmetric about the central axis of the refocusing pulse. In a more particular embodiment, the phase of each segment is also symmetric about the central axis of the refocusing pulse and the five segments include a substantially constant amplitude.
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