Apparatus and methods for estimating downhole fluid compositions
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United States of America Patent
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Aug 21, 2012
Grant Date -
Jun 18, 2009
app pub date -
Jan 2, 2009
filing date -
Sep 24, 2004
priority date (Note) -
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Abstract
An apparatus and method for estimating a property of a species of the hydrocarbon in a downhole fluid are provided. In one aspect, the method may include: imparting a magnetic field on the fluid to align nuclei of the fluid with a direction of the primary magnetic field; imparting a perturbing radio frequency signal on the fluid to excite the nuclei of the fluid; detecting a radio frequency signal emitted by the excited nuclei of the fluid; estimating a frequency shift between the perturbing radio frequency and the detected radio frequency; and estimating using the frequency shift a property of one or more species of the hydrocarbons in the fluid.
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