Method for determining wettability of an oil reservoir
AssigneeSchlumberger Technology Corporation
InventorRobert Freedman
Life of this patent
Estimating the term…
Abstract
A method for determining wettability of an earth formation zone surrounding a borehole, including the following steps: introducing paramagnetic ions into the water component of the zone; performing NMR measurements on the zone, and determining an NMR relaxation time parameter for the zone; extracting a fluid sample from the zone; performing NMR measurements on the sample, and determining the NMR relaxation time parameter for the sample; and determining wettability of the earth formation zone using the determined relaxation time parameter for the zone and the determined relaxation time parameter for the sample.
Claims20
A method for determining wettability of an earth formation zone surrounding a borehole, comprising the steps of:
- introducing paramagnetic ions into the water component of said zone;
- performing NMR measurements on said zone, and determining an NMR relaxation time parameter for said zone;
- extracting a fluid sample from said zone;
- performing NMR measurements on said sample, and determining said NMR relaxation time parameter for said sample;
- and
- determining wettability of said earth formation zone using said determined relaxation time parameter for said zone and said determined relaxation time parameter for said sample.
A method for determining wettability of an earth formation zone surrounding a borehole, comprising the steps of:
- injecting paramagnetic ions into a water component of the formation zone to replace at least a portion the water component in the formation zone;
- performing NMR measurements on the formation, and determining an NMR relaxation time parameter for said zone;
- extracting a fluid sample the formation zone;
- performing NMR measurements on the fluid sample, and determining said NMR relaxation time parameter for the fluid sample;
- and
- determining wettability of the formation using the determined relaxation time parameter for the formation zone and the determined relaxation time parameter for the fluid sample without use of diffusion measurements.
Dependencies are inferred from the claim text.