دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: (Ω) a unit for measuring electrical resistance. One ohm is equal to the resistance through which a current of 1 ampere will flow when a potential difference of 1 volt exists across a circuit.

electrical unit of resistance. One ohm is the the resistance through which a potential of one volt will maintain a current of one ampere.

E=IR, I=E/R, or R=E/I, the current I" in a circuit is directly proportional to the voltage "E", and inversely proportional to the resistance "R".

n: a type of lubrication in highspeed chain-and-sprocket drives in which a portion of the chain passes through an oil bath (sump),which coats all of the chain on each revolution to lubricate it.

n: a kinds of method that solves the filter cake adhere sticking.

n: on an engine, a device used to remove foreign particles from the engines lubricating oil. The engines oil pump forces the oil through one or more oil filters. Special elements in the filter trap the particles and prevent them from circulating through the engine and possibly damaging it. Many types of filter are available.

n: a drilling mud, e.g., oil-base mud and invert-emulsion mud, in which oil is the continuous phase. It is useful in drilling certain formations that may be difficult or costly to drill with water-base mud. Compare oil-emulsion mud.

n: 1.A mud in which the external phase is a product obtained from an oil, such as diesel oil or mineral oil. 2.More generally, a mud system that has any type of nonaqueous fluid as the external phase. This definition would include the newer variety of oil mu

n: a non operating interest in oil and gas from one or more leases that provides its owner a fractional share of the oil and gas produced, free of the costs of production, and that terminates when a specified dollar amount or volume of production has been realised. Oil payments may be created and reserved when a lease or royalty interest is assigned. or they may be carved out of a leasehold or royalty interest and assigned to another party.

n: (OPA) a congressional act passed to reduce the risk and damages caused by large oil spills on navigable waters. OPA provides for increased federal response authority, increased civil penalties, emphasis on worstcase contingency planning, and a billiondollar trust fund to help clean up severe spills. The objective of OPA is to prevent discharges of oil into federal waters from vessels and facilities and to ensure that, if such spills occur, owners and operators have the resources to clean them up.

n: a wire-mesh screen, usually located at the point where the oil pump picks up oil from an engines oil pan. The screen traps large foreign particles that may not have settled to the bottom of the pan. Compare oil filter.

n: to prevent mud shell tumbling or oil sand layer flowing and jamming the bottom, people usually lower filter tube at the oil naked section.