دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

a large, load supporting formation that may serve to reduce the total overburden load on a pay zone. These formations may cover hundreds of square miles over a basin. A second use is as a semi-stable structure of sand grains around a perforation or other

movement of clay particles, usually after partial disintegration of the clay matrix due to absorption of water or reaction to other effects such as ions, velocity, crushing due to overburden, etc.

n: a decrease in the volume of a stratum due to pressure exerted by overlying strata, evaporation of water, or other causes.

n: The process of breaking cuttings and compacting it into sample with compaction cell when doing preventing caving test.

a crushing of the matrix structure as overburden loads press down on the rock, reducing the pore space. During production of the well, the load on the matrix increases as the pore-filling fluids are removed. These loads may reduce the porosity of the rock

n: The hydraulic pressure applying around cylindrical core sample in conventional triaxial test.

various earth forces acting on the formation. Includes overburden.

n: a tool used to strike the pipe forward when drills the overburden or makes of casing

n pi: impermeable shales, highly compressed by overburden pressure, that are characterized by large amounts of formation fluids and abnormally high pore pressure.

n: the pressure to which a formation is subjected by its overburden. Also called ground pressure, lithostatic pressure, rock pressure.

n: the load exerted by a column of rock.under normal conditions this pressure is approximately 1psi/ft,this is also known as lithostatic pressureor overburden pressure.

the stresses on the formation imposed by the overlying overburden and tectonic forces. The stresses are at least partially offset by the fluids in the pores of the formation.

n: the overburden pressure enforces a stress to any point in the layer , its direction is downward. When open a hole , the unbalance happen and produce a horizontal
foce that its direction to the holebore.

n: see geostatic pressure.

n: see geostatic pressure.

overburden pressure of rocks at a depth.