دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: Bumping a section of weighted drill fluid into the bottom hole for preventing blowout .

n: Bumping a section of weighted drill fluid into the well head for preventing blowout .

n: the density of a cement slurry, expressed in pounds per gallon, pounds per cubic foot, kilograms per litre, and so on.

n: The weight per volume slurry.

v: 1. to force pipe or tools into a highpressure well that has not been killed (i.e., to run pipe or tools into the well against pressure when the weight of pipe is not great enough to force the pipe through the BOPs).

Snubbing usually requires an array of wireline blocks and wire rope that forces the pipe or tools into the well through a stripper head or blowout preventer until the weight of the string is sufficient to overcome the lifting effect of the well pressure on the pipe in the preventer. In workover opera- tions, snubbing is usually accomplished by using hydraulic power to force the pipe through the stripping head or blowout preventer. 2. to tie up short with a line.

n: the process of lowering pipe into the wellbore when the well is shut in on a kick and when the pipes weight is not sufficient to overcome the force of well pressure.

n: either a stand-alone device or a rig-assist device that is used to force pipe into the well when the well is shut in on a kick. When the pipes weight is not sufficient to overcome the upward force of well pressure, a snubbing unit must be used. Compare stripping in.

n: a synthetic highmolecular- weight polymer of acrylonitrile used primarily as a fluid loss-control agent.

n: 1. a thickened fluid that displaces drilling mud because of the difference in viscosity and weight between the spacer and the mud. Besides carrying lost circulation materials, spacers may be weighted with various inert materials such as fly ash and barite. 2. member of a pipeline construction gang who is responsible for assuring that the exact distance between the beveled pipe ends for a welding process to be used on the joint is maintained. Spacers strike a wedge into the interface between the pipe bevels and then maneuver them to an exact, uniform distance around the entire circumference.

n: A viscous fluid used to aid removal of drilling fluids before a primary cementing operation. The spacer is prepared with specific fluid characteristics, such as viscosity and density, that are engineered to displace the drilling fluid while enabling place

n : a fishing tool used to retrieve pipe lost in a well. The spear is lowered down the hole and into the lost pipe. When weight, torque, or both are applied to the string to which the spear is attached, the slips in the spear expand and tighdy grip the inside of the wall of the lost pipe. Then the string,spear, and lost pipe are pulled to the SPEARS surface.

n: An inside catch tool which goes inside a tubular fish and catches it with a slip.

a fishing tool that is designed to enter an opening of a fish and grip the ID.