Patent ID: 8768628

Claim:
A method for determining Reservoir Rock wettability comprising steps of: generating and utilizing core samples, wherein a core sample is generated by dividing a core plug into a plurality of core samples of a preset size and wherein the preset size of each core sample in the plurality of core samples is an average diameter of 3.8 cm and a length of 1.5 cm; sealing a side of the core sample with an epoxy resin, wherein the side of the core sample is sealed to ensure a one-dimensional liquid penetration into the core sample; mounting a hook on a top side of the core sample; saturating the core sample with a first reservoir fluid; connecting the saturated core sample to a high precision balance, wherein the saturated core sample is connected using a thin rope; taking a second reservoir fluid in an imbibition beaker; hanging the saturated core sample over the second reservoir fluid contained in the imbibition beaker, wherein the saturated core sample is hanged using a thread and wherein the saturated core sample is hanged in a way such that a bottom part of the saturated core sample barely touches the second reservoir fluid; commencing an imbibition process for the hanged and saturated core sample; monitoring a change in a mass of the hanged and saturated core sample over a period of time as imbibitions taking place to obtain a data and wherein the data is a square of the change in the mass of the hanged and saturated core sample over a period of time; generating a curve using the obtained data by plotting a square of the change in the mass of the hanged and saturated core sample with respect to time; calculating a slope of the generated curve; computing a value of a rock constant for the core sample; and applying the calculated slope of the generated curve and the computed value of a rock constant for the core sample in a modified form of Washburn equation to compute a value of a contact angle; wherein the computed value of contact angle represents a wettability of the core sample and in turn represents the wettability of a reservoir rock from which the core plug is generated.