time to desorb into the oil completely such complete desorption may take as long as about 6 months but this estimate is heavily dependent on the oil well formation and production characteristics this property of the asphaltene inhibitors is believed to be unique and makes it a squeeze asphaltene inhibitor with a long squeeze life in one non limiting embodiment the u201c squeeze u201d application introduces enough asphaltene inhibitor into the subterranean formation to permit crude oil production from the subterranean formation where a sufficient quantity of the asphaltene inhibitor remains within said formation for at least twice as long as a conventional asphaltene inhibitor would remain again with this method sufficient asphaltene inhibitor chemical remains within the formation to inhibit asphaltene aggregation during production periods that are about 2 to 5 times longer than conventional asphaltene inhibitors injected into hydrocarbon bearing reservoirs the invention will now be illustrated with respect to certain examples which are not intended to limit the invention but instead to more fully describe it the reaction products described herein were tested on a crude oil from prudhoe bay ala at a dosage of 500 ppm to determine their performance as asphaltene inhibitors on a precipitation test where a low transmittance and high u201c dispersion u201d are indications of good inhibition of precipitation results were compared to baker hughes commercial inhibitor ai as the performance standard the results are shown in table i below it is evident from the data that the performance of the conventional inhibitor ai and three different modified forms of the asphaltene.