دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the assembly of tools run into the hole during fishing to perform a wash- over. A typical wash- over string consists of a washover back-off connector, several joints of washover pipe, and a rotary shoe.

n: a short length of surfacehardened pipe that fits inside the swivel and serves as a conduit for drilling fluid through the swivel.

n: layers of dense flexible material that is stacked around the swivels washpipe and the swivels interior body seal. It helps seal between the static washpipe and the turning swivel body to ensure that high-pressure drilling mud flows through the swivels stem and into the kelly.

n: the practice of reducing the amount of waste generated from a site through recycling programs and the use of non-hazardous chemical substitutes for hazardous chemicals.

n: in tank sampling, a sample obtained with a thief to determine the amount of material at the bottom of the tank that cannot be sold.

mud with water as the external phase. May contain clays, polymers, or even an internal oil phase.

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

n: the upward encroachment of water into a well caused by pressure drawdown from production.

movement of water upward into oil strata in response to production of oil and lower reservoir pressures. May be localized in areas of high vertical permeability.

n: The formation water inrush into the drilling fluid,which can deteriorate the performance of the drilling fluid.