دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

the mechanism that provides pressure isolation between each casing hanger and the wellhead housing.

n: the pressure exerted by a specific number of molecules contained in a specific volume (usually I cubic foot) at a specific temperature. Base pressure is a factor used in calculating gas volume. Standard base pressure varies from state to state. In Texas, for example, base pressure is 14.73 psia at 6().F. In Louisiana, base pressure is 15.025 psia at 6()ﾰF. base price II: the value of natural gas, usually at the wellhead, before any imposition of taxes, gathering, compression, or other charges, as stated in a gas sales contract. basicity II: pH value above 7 and the ability to neutralise or accept protons from .:ids.

a straight through flow line from the wellhead to a flare pit. Often used in diverting flow during a well control incident.

n: one of several valves installed at the wellhead to prevent the escape of pressure either in the annular space between the casing and the drill pipe or in open hole (i.e., hole with no drill pipe) during drilling or completion operations. Blow- out preventers on land rigs are located beneath the rig at the lands surface;on jackup or platform rigs, at the waters surface;and on floating offshore rigs, on the seafloor. See annular blowout preventet;ram blowout preventer:

n: the assembly of well-control equipment including preventers. spools. valves. and nipples connected to the top of the wellhead.

any portion of the wellhead or tree that contains wellbore pressure.

n: in drilling operations, an insert that fits into the opening of a master bushing and accommodates the slips.

n: See insert.

a section of the wellhead or of a tool what allows slips to be inserted to hold pipe or equipment.

an older (actually trademarked name) for the wellhead.

n: 1. a failure of equipment.2. in a fracture treatment or a squeeze job, the failure of formation rock to withstand pressure, allowing it to rupture. adj: pertaining to the amount of pressure needed at the wellhead to rupture the formation in a fracture treatment or a squeeze job (as in formation breakdown pressure).

fracture.

n: 1. forcing gas back into a formation by pumping into the annulus from the surface.2. any pumping procedure in which fluid is pumped into the well against pressure.

forcing fluids in the pipe into the formation at a pressure higher than the pore pressure and sometimes higher than the fracturing breakdown pressure. Used to displace a kick out of the pipe when wellbore and wellhead pressure limits permits.