§ 88. Over Indian reservations. Such corporations may contract with the chiefs of any nation of Indians over whose lands it may be necessary to construct its pipe line for the right to construct the same upon such lands, but no such contract shall vest in the corporation the fee of such lands, nor the right to occupy the same for any purpose other than for the construction, operation and maintenance of such pipe line, nor shall such contract be valid or effectual until the same has been ratified by the county court of the county in which the lands are situated.