ABSTRACT
X X Xanthan™: A biopolymer. Xanvis™: A modied Xanthan polymer. XCD™: The brand name of a biopolymer. xHPHT: Ultrahigh-pressure high temperature. X-Link: Cross-linked gel. Xmas Trees: See Subsea (Xmas) trees. XN Pro–le: X prole with a no-go or no-go ledge for selling a no-go sleeve. XO: Crossover. XOM: Exxon Mobil. X Pro–le: A standard prole. Can accept a plug or other tools. XRD: X-ray diffraction analysis. XT: Christmas tree. Xylene: (1) An aromatic hydrocarbon that is the basis for many petrochemicals; along with toluene, a key ingredient in unleaded gasoline. (2) Colorless liquid of the aromatic group of hydrocarbons made the catalytic reforming of certain naphthenic petroleum fractions. Used as high-octane motor and aviation gasoline blending agents, solvents, and chemical intermediates. Isomers are metaxylene, orthoxylene, and paraxylene. (3) Xylene is a ¤ammable, toxic aromatic hydrocarbon liquid. Xylene is related to benzene and can be distilled or synthesized. (4) The nonsystematic name for dimethylbenzene, as shown in the following gure:
