دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

a cement slurry, foamed with between 40 and 60% nitrogen gas. Has a slurry density of about 7.5 to 10 lb/gal (0.9 to 1.2 g/cc).

n: a phenomenon that layer snailed to wellbore after drilled the plasticity layer.

n: the reduction of permeability in a reservoir rock caused by the invasion of drilling fluid and treating fluids to the section adjacent to die wellbore. It is often called skin damage.

n: damage to the productivity of a well resulting from invasion into the formation by mud particles or mud filtrates. Asphalt from crude oil will also damage some formations.

an obstruction to flow. Usually a reduction of permeability.

n: pay formation hole wall is macerated by all kinds of filters ,making the intrinsic permeability of near wellbore layer droped largely.a permeability plugging ring is called formation damage degree.

n: a condition that lead to the drilling is not successfully because of the divergence of wellbore in drilling or after drilling through the layer.

n: the point at which a formation will crack from pressure in the wellbore.

n: Pressure above which injection of fluids will cause the rock formation to fracture hydraulically

n: in drilling,formation pressure is balanced by mud fluid hydrostatic column pressure .

n: the pressure gradient (psi/foot) at which a formation accepts whole fluid from the wellbore. Also called frac gradient.

n: a measure of how the strength of the rock (i.e.its resistance to breakdown) varies with depth.

the gradient needed to initiate a fracture.

the length of one wind of a fracture from the wellbore to the tip.

n: pressure above which cause formation become to fracture in order to generate split.




the pressure necessary to start a fracture from the wellbore.