Method and apparatus for NMR measurement of wettability
AssigneeSchlumberger Technology Corporation
InventorsMartin D. Hurlimann, Lalitha Venkataramanan, Christian Straley
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Abstract
The present invention relates to a method and apparatus for determining the wettability of a porous media, such as bone, plant, food, wood or molecular sieves, etc., having two or more fluids. The method of the present invention correlates a diffusion-relaxation calibration function representative of at least one fluid in the porous media with a 2-D function developed using diffusion-editing to determine wettability of the porous media.
Claims26
A method of extracting information about a porous media containing two or more fluids comprising:
- a) applying a magnetic field gradient to said two or more fluids;
- b) applying a first series of oscillating magnetic field pulses to said two or more fluids, said first series of pulses having an initial magnetic field pulse, a first portion followed by a second portion;
- c) detecting magnetic resonance signals generated in (b);
- d) after a wait time, applying a second series of oscillating magnetic field pulses to said two or more fluids, said second series of pulses having an initial magnetic field pulse, a third portion followed by said second portion;
- e) detecting magnetic resonance signals generated in (d);
- and
- f) analyzing said detected signals to determine the wettability of said porous media.
A method of extracting information about an earth formation containing two or more fluids comprising:
- a) applying a magnetic field gradient to said two or more fluids;
- b) applying a first series of oscillating magnetic field pulses to said two or more fluids, said first series of pulses having an initial magnetic field pulse, a first portion followed by a second portion;
- c) detecting magnetic resonance signals generated in (b);
- d) after a wait time, applying a second series of oscillating magnetic field pulses to said two or more fluids, said second series of pulses having an initial magnetic field pulse, a third portion followed by said second portion;
- e) detecting magnetic resonance signals generated in (d);
- and
- f) analyzing said detected signals to determine the wettability of said earth formation.
A logging apparatus comprising:
- a logging tool that is moveable through a borehole;
- and
- a processor that is coupled with the logging tool, the processor being programmed with instructions which, when executed by the processor:
- cause the logging tool to:
- i) generate a first series of oscillating magnetic field pulses to said region of earth formation, the first series having an initial magnetic field pulse, a first portion followed by a second portion;
- ii) detect magnetic resonance signals produced from the region of earth formation;
- iii) after a wait time, apply a second series of oscillating magnetic field pulses to said region of earth formation, said second series having an initial magnetic field pulse, a third portion followed by said second portion;
- iv) detect magnetic resonance signals produced from the region of earth formation;
- and
- cause the processor to:
- v) analyze the detected magnetic resonance signals to determine the wettability of the region of investigation.
Dependencies are inferred from the claim text.