Schlumberger Technology Corporation

Toshiba International Corporation

Daniel Catina

Robert Freedman

Vivek Anand

Payam Tabrizi

Anatoly Dementyev

Ali Bakhreiba

Krishnamurthy Ganesan

Douglas W Grant

Ricardo Y Torres

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.

Determining the Larmor frequency for NMR tools

A nuclear magnetic resonance (NMR) measurement system for high pressure and temperature measurements on fluids is disclosed. The system has a sensor assembly that includes a sample holder having a body formed from a non-magnetic metal and defining an interior cavity for receiving a fluid sample, a frame member disposed in the interior cavity of the sample holder, an antenna coil disposed in the interior cavity about the frame member, an inlet that allows the fluid sample to enter the interior cavity, an outlet that allows for the fluid sample to be flushed from the interior cavity, and a magnet assembly having a central bore in which the sample holder is disposed. Adjacent to the sample holder are pulsed field gradient coils for performing diffusion measurements. The system further includes pulse sequencer circuitry that supplies signals to the antenna coil. When the interior cavity of the sample holder is filled with the fluid sample, the antenna coil and the frame member are at least partially submerged in the fluid sample, and the antenna coil obtains NMR measurements of the fluid sample in response to the signals. Related methods and apparatuses are also disclosed herein.

System and method for obtaining nuclear magnetic resonance measurements on reservoir fluids for prediction of fluid properties

Determining the larmor frequency for NMR tools

An Uninterruptible Power System is described that is configured to operate as a buffer between a supplied power and an electrical load such that if line voltage is interrupted power to the load is maintained for a period of time. The uninterruptible power system is characterized in that it has a user interface that includes a touch screen having a display for presenting a graphical user interface and configured for manual user activation upon touching of said screen upon portions of the displayed graphical user interface, and a control module having programming configured to display a graphical user interface on the touch screen. In addition, the graphical user interface includes: a plurality of manually selectable tabs configured to present pages related to separate aspects of the uninterruptible power system; a menu configured to present sub-pages pertaining to respective ones of the tabs; wherein the tabs and the menu are located proximate a side of the touch screen; and at least one diagram including a plurality of regions having links to sub-pages pertaining to respective ones of the tabs.

Uninterruptible power system (UPS) with improved manual user interface having a touch screen with main tabs separating pages, sub-menus identifying sub-pages related to certain main tabs, and links to pages or sub-pages

Touch screen panel for an uninterruptible power system (UPS)

Growing community of inventors

Cypress, TX, United States of America

Daniel Catina