05.07.2009

Surface in a reservoir above which predominantly gas occurs and below which predominantly oil occurs.

The layers in a reservoir are gas, then oil below and water below that.

Gas and oil are miscible, so the contact between gas and oil is transitional, forming a zone containing a mix of gas and oil.

The underground porous strata which contains natural gas and from which it is produced. “Sand” as used here is a generic term that may denote a porous limestone or dolomite, as well as a sandstone or unconsolidated sand formation

A semi-automatic or automatic arc welding process in which a continuous and consumable wire electrode and a shielding gas are fed through a welding gun. GMAW was first used for welding aluminum and other non-ferrous materials but became prevalent in steel due to its shorter welding time compared to alternative processes and is now the most common industrial welding process.

Number of cubic feet of gas produced per barrel of oil

A process of opening up “channels” in an underground hydrocarbon reservoir by pumping special fluids down the well under high pressure. Fracturing causes the formation to crack open, creating passages for the reservoir fluids to more easily flow into the wellbore. Hydraulic fracturing is an effective method for enabling the recovery of oil and gas from hard to access reserves. Fracing involves shooting a mix of sand, water and chemicals into gas wells to crack brick-like sandstone, releasing gas trapped in tiny pores