Abstract: Additives that act to control clay swelling in drilled formations without adversely effecting properties of the drilling fluid are comprised of bis-3-aminopropyl ether amine functionalities, a derivative thereof, or mixtures thereof. The amine is derived by bis-cyanoethylation of terminal hydroxyl functionalities and subsequent hydrogenation of the nitrile end groups to bis-3-aminopropyl primary amines. The backbone comprises a di-ethers or polyethers based on: ethylene oxide (EO), propylene oxide (PO), and all potential isomers of butyl di- or polyethers. Such bis-3-aminopropyl ether amines may include, but are not limited to amines with the following formula: H2N—R?—O—(RO)x-R?—NH2 where R? is (CH2)3; and R is: 1.) C2H4, with x being 2-10, or 2.) branched C3H6, with x being 1-17, or 3.) branched or linear C4H8, with x being 1-15, or 4.) linear C6H12, with x being 1, or 5.