دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the mud sheath that exist in hole pores.

filtration control by particles smaller than the pore bridging size that invade the pores and bridge within the pore throats. Often very difficult to remove.

n: a hindrance to movement of fluids within the formation rock of a reservoir. Permeability barriers include obvious problems, such as shale lenses and calcite or clay deposits, and less obvious ones, such as porosity changes.

n: packed bed that surrounded permeable bed, it is impervious bed or poor permeable bed.




a barrier to movement of a fluid through the rock. This may be a change in the rock where the pores are no longer connected or even present, or secondary mineral growth that filling in the pore throats and natural fractures. In one sense, a permeability b

n pi: connections between pores.

n: a reduction in the permeability of a formation caused by the invasion of water into the pores.

n: A condition caused by an increase in water saturation in the near-wellbore area. Water block typically forms during the drilling phase of a well, when the near-wellbore area is exposed to a relatively high volume of filtrate from the drilling fluid. The i

a relative permeability problem usually occurring in a gas zone. Highest potential formations for water blocks are low pressure gas sands (<0.25 psi/ft pore pressure),with small pore throats (<10 microns),lower permeability (<100 md),and when using wat