Invention Grant
- Patent Title: Determining the larmor frequency for NMR tools
- Patent Title (中): 确定NMR工具的拉莫频率
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Application No.: US12728961Application Date: 2010-03-22
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Publication No.: US08686723B2Publication Date: 2014-04-01
- Inventor: Vivek Anand , Robert Freedman , Anatoly Dementyev , Payam Tabrizi , Daniel Catina
- Applicant: Vivek Anand , Robert Freedman , Anatoly Dementyev , Payam Tabrizi , Daniel Catina
- Applicant Address: US TX Sugar Land
- Assignee: Schlumberger Technology Corporation
- Current Assignee: Schlumberger Technology Corporation
- Current Assignee Address: US TX Sugar Land
- Agent John Vereb; Harjit Kohli
- Main IPC: G01V3/00
- IPC: G01V3/00 ; G01V3/18

Abstract:
The Larmor frequency for an in situ nuclear magnetic resonance (NMR) tool is determined and used to acquire NMR data. An NMR tool is provided and placed in situ, for example, in a wellbore. An initial estimate of the Larmor frequency for the in situ NMR tool is made and NMR data are acquired using the in situ NMR tool. A spectral analysis is performed on the NMR data, or optionally, the NMR data are digitized and a discrete Fourier transform (DFT) is performed on the digitized NMR data. The modal frequency of the spectral analysis or DFT is determined, and the Larmor frequency for the in situ NMR tool is determined using the modal frequency. The NMR tool is modified to transmit at the determined Larmor frequency and then used to acquire further NMR data.
Public/Granted literature
- US20110227570A1 DETERMINING THE LARMOR FREQUENCY FOR NMR TOOLS Public/Granted day:2011-09-22
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