ABSTRACT
Z Z Zeolite: A class of minerals that are “hydrated aluminosilicates.” An aluminosilicate is where some of the Si atoms in silica (which has the perfectly reasonable chemical formula SiO4) are replaced with aluminum, giving an excess negative charge. “Hydrated” means that water is strongly associated with these materials by hydrogen bonding. Lastly, a positively charged “counterion” is needed to balance the negative charge on the zeolite. Zeolites are extremely porous materials, with a regular internal structure of cavities of dened size and shape. Zeta Hammer™: A brand name of a tool used to deliver rapid impact stokes to a small BHA downhole. Operated by ¤uid ¤ow. Usually run on CT. Z-Factor: The compressibility correction index used in the ideal gas law. Z = Vactual/Videal. Ziegler-Natta Catalyst: A compound containing a metal-carbon bond that can be used to make highly ordered, high-density polymers by a chaingrowth mechanism. A typical Ziegler-Natta catalyst is the compound formed in situ between titanium trichloride and diethylaluminum chloride; see the following gure:
These catalysts are named after two famous polymer chemists named, strangely enough, Ziegler and Natta. You can nd out much more than you ever wanted to know about them at the Macrogalleria. Zinc Brine: A brine made of salts of zinc, usually very dense. Zinc Sul–de/Sulfate: Scales that may occur after use of zinc brines where sulfate water is found. ZnCl2: Zinc chloride. Zone: (1) An interval of a geologic formation that contains one or more oil or gas reservoirs; a portion of a geologic formation that has the porosity and permeability to form petroleum traps for oil and natural gas. (2) Space or group of spaces within a building with heating or cooling requirements sufciently similar that comfort conditions can be maintained by a single controlling device. Zone of Cooperation: An area of the Timor Sea jointly administered by Australia and East Timor.
