A method to be used when performing drilling in a well bore involves positioning a dual bore drill pipe in a well bore. An outer annulus formed between the drill pipe and well bore wall is divided into two different sections. A first fluid is provided in one of the sections. A second fluid having a density less than the first fluid is circulated into and out of the well bore through the drill pipe. The densities of the first and second fluids are such that the drill pipe is at least partly floating in the first fluid in the outer annulus.