Determining wettability of an oil reservoir using borehole...

Details Determining wettability of an oil reservoir using borehole... Determining wettability of an oil reservoir using borehole...

G - Physics

01

V

G01V 3/32 (2006.01) E21B 47/00 (2006.01) G01R 33/44 (2006.01) G01R 33/50 (2006.01)

Patent

CA 2427903

A method for determining downhole reservoir wettability includes acquiring a first set of NMR measurements of formation fluids in earth formations at a selected axial depth; inverting the first set of the NMR measurements to produce a first distribution of a spin relaxation parameter for a fluid component in the formation fluids; acquiring a second set of NMR measurements of a formation fluid sample removed by a formation fluid testing tool at the selected axial depth, the formation fluid sample being kept at a substantially same pressure and temperature as those of the formation fluids in the earth formations at the selected axial depth; inverting the second set of NMR measurements to produce a second distribution of the spin relaxation parameter for the fluid component in the formation fluid sample; determining the reservoir wettability from a comparison of the first and second distributions of the spin relaxation parameter.

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