[12] Patent
[11] Patent No.:GC0007494  
[45] Date of Publishing the Grant of the Patent: 30/Apr /2018                48/2018  
Number of the Decision to Grant the Patent:2018/125334
Date of the Decision to Grant the Patent:02/Apr/2018

[21] Application No.:GC 2013-24009

[22] Filing Date:2/4/2013

[30] Priority:

[33] State [32] Priority date [31] Priority No.

[72] Inventors:1- Ahmed Muthana،2- Gabor Hursan ،3- Shouxiang Ma،4- Philip M. Singer،5- Benjamin Nicot،6- Andrea Valori،7- Farhan Ali،8- Henry N. Bachman

[73] Owners:1- Schlumberger Technology B.V., Parkstraat 83-89, The Hague, Netherlands،2- SAUDI ARABIAN OIL COMPANY, 1 Eastern Avenue, 31311, Dhahran , Saudi Arabia

[74] Agent: Suleiman I. Al-Ammar Law Office




Int. Cl.: E21B 43/32, 47/00 (2006.01)

[56] Cited Documents:

-US 2006-0273788 A1 (GEORGI et al.) 07 December 2006
-US 6765380 B2 (FREEDMAN et al.) 20 July 2004
-US 2010-0237860 A1 (HURLIMANN et al.) 23 September 2010
-WO 2011-091269 A2 (SCHLUMBERGER CANADA LIMITED et al.) 28 July 2011
-US 2011-0181277 A1 (KORE JEAN-PIERRE et al.) 28 July 2011
Examiner: Eng. Mohammed A. AlShamrani

[57] Abstract: Methods are described for wettability characterization based on NMR measurements, which are sensitive to the surface wetting conditions of oil and water at the pore scale. The described methods make use of surface relaxation effects on the NMR relaxation (T2). Workflows are described to obtain wettability profiles of a porous media such as a rock either in the native state or prepared to a certain state in the laboratory. An underlying forward model is also described for the mixed wet and fractionally saturated pore spectrum. Outputs of the described inversion include continuous saturation and wettability profiles as a function of the pore sizes in the porous media, as well as an averaged value for saturation and wettability over the entire pore spectrum.
No. of claims: 35     No. of figures: 9


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