دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

v: to disconnect a pull-rod line from a central power unit.

reaching bottom with the plug during a cementing operation or fluid displacement operation.

adj: in cementing operations, pertaining to a cement plug that comes to rest on the float collar. A cementing operator may say, Ive a bumped plug" when the plug strikes the float collar.

n: See bumper sub.

n: a device made up in the drill string that, when actuated, de- livers a heavy downward blow to the string. A bumper jar has a hollow body that moves upward when the drill string is picked up. When the string is dropped quickly, the jar body produces a sharp downward blow on the tubing or pipe made up below the jar. If downward blows can free a fish, a bumper jar can be very effective.

n: Made by upwardness, lower part of the body and joint. The upwardness and lower part of the body are connected with plain bearing. The operating principle of it is the same with bumper sub. Used to handle sticking when the drill bit is not at the bottom.

n: a percussion tool run on a fishing string to jar downward or upward on a stuck fish to knock it free. The bumper sub body moves up and down on a mandrel.

n: A drilling tool consisting of a short stroke slip joint that allows a more constant WOB when drilling from a floating rig.

n: The pump pressure increases suddenly when top cement plug collides with wown cement plug at the later stage of cementing in cementing.

n: a nitrile rubber used in seals and packing units throughout the oilfield.

n: see residuals.

a fuel oil, normally with high sulfur and high viscosity. API gravity of about 10.5o. Also called Navey Heavy and Number 6 fuel oil.