Carboxyl-containing fructans such as carboxymethylinulin can be successfully used to prevent deposition of scale composed of, for example, calcium, barium and strontium salts of sulphuric acid and carbonic acid in oil extraction. The emulator comprises an emulation controller capable of coupling to the information interface, a network controller coupled to the emulation controller and capable of coupling to an external network, and a storage. upon purchase of the apparatus without unpacking the apparatus from a shipping carton.