دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: (BOC) the positioning of the piston at the lowest point possible in the cylinder of an engine;often marked on the engine flywheel.

n: The base flow in the cyclone is not U-flow situation that low speed liuqid does not contain separated solid particle but high speed mud because the operation is improper.

n: a mechanism for anchoring a bottomhole pump in a well;located on the lower end of the pump. Compare top hold-down.

the equipment or tools at the bottom of the tubing or drill string. The BHA is changed to achieve a certain result.

a restriction in a profile near the bottom of the well that allows some gas expansion and holds a backpressure on the formation. Rarely used, but considered for hydrate control.

n: The Process that keeping downhole cleaning and improving drilling efficiency by jet flow of drilling fluid pounding the cuttings in the downhole in the drilling programe.

gas anchor or a separator used in front of a pump to deflect most of the free gas to improve pump efficiency.

n: When a new bit brings into operation, drill with low bit load and rotate speed to running in the bit and make the bit coincide with bottom hole pattern. Bottom hole pattern can prolong bit life.

The pressure at the bottom of the well. In a producing well the BHP may be the bottom hole flowing pressure or the bottom hole shut-in pressure. In a drilling or workover environment, the BHP is exerted by the column of fluid in the hole.