دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

a pore pressure higher than a column of sea water for that true vertical depth.

describes the relationship between pore pressure and stress

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.

n: the relatively small amount of gas enters a well when the mud pump is stopped for a connection to be made. Since bottomhole pressure decreases when the pump is stopped, gas may enter the well.

the small amount of gas that enters the wellbore when circulation is stopped to make a connection. The gas only enters the wellbore in this case when the static fluid pressure is less than the pore pressure.

n: the differience between the gradient of formation burst pressure and the gradient of pore pressure

n: refer to pore pressure

n: the force exerted by fluids in a formation, recorded in the hole at the level of the formation with the well shut in. Also called reservoir pressure or shut-in bottomhole pressure.

n: the pressure exerted by the formation fluids at a particular point in the formation,sometimes called reservoir pressure or pore pressure.

the pressure of the fluid in the formation. The initial reservoir pressure is the pressure at discovery.

n: formations mechanically physical property,such as compressive strength,hardness and abradability,burden pressure,pore pressure, porosity,permeability,adhesive capacity,formation temperature and so on.

the earth stresses acting to try to close a hydraulic fracture offset by the pore pressure. A measurement of the pressure at which the fractured formation closes. Generally determined by the change in slope of the pressure reading as leakoff gradually les

n: abnormally high pressure exerted by some subsurface formations. The deeper the formation, the higher the pressure it exerts on a wellbore drilled into it.

n: The pressure within the Earth, or formation pressure. The common oilfield usage, however, is to indicate anomalous subsurface pore pressure that is higher or lower than the normal, predicted hydrostatic pressure for a given depth, or the pressure exerted