Patent · US Expired

NMR logging apparatus and methods for fluid typing

US6366087B1 · kind B1 · utility

28Cited by
96References
34Claims
0Family size

Inventors

Key dates

Filing dateOct 28, 1999
Grant dateApr 2, 2002
Priority date—
Expiry dateOct 28, 2019

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01R33/4625
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

A novel method and apparatus is disclosed for the separation of fluid phases in NMR borehole measurements. The method is based on selecting an optimum contrast mechanism and a corresponding set of measurement parameters for a particular borehole environment. The contrast mechanism can be based on diffusion, relaxation time or hydrogen index differences between different types of fluids. Once an initial measurement is made, the measurement parameters are compared to a predetermined set of values to broadly estimate the types of fluids present in the geologic environment. If necessary, the measurement is repeated to obtain optimal fluid typing for the estimated fluid types.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.