دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: A string of drillpipe that consists of two or more sizes or weights.

n: drill pipe, tubing, sucker rods, and so forth with the diameter near the top of the well larger than the diameter below.

n: A string of drillpipe or casing that consists of two or more sizes or weights.

a tubing string with more than one tubing size. Normally the smallest pipe is on bottom with larger sizes toward the top. The sizes are set to minimize flowing friction and keep the velocity above the critical level to lift fluid.

n: the weight of an empty container subtracted from the gross weight of the container and that which is in the container to ascertain net weight.

n: a device on a retrievable or drillable packer that allows the packer to be set with an upward pull (tension);it is often used when not enough pipe weight is available to set the packer by applying downward force (compression).

n: the tendency of permafrost to sink when a heavy weight or structure is placed on it. When the structure is placed on frozen ground, any heat that thaws the soil causes it to become soft, so that the structure sinks or subsides into it.

n: The weight on bit that causing bottom hole drill string destablizing and occuring primary bending.

n: The weight on bit that causing bottom hole drill string bending to the shape of two and a half wave

n: A thinning agent used to reduce viscosity or prevent flocculation;incorrectly called a dispersant. Most deflocculants are low-molecular weight anionic polymers that neutralize positive charges on clay edges. Examples include polyphosphates, lignosulfon

n: a special chemical or combination of chemicals that, when added to a drilling mud, reduces its viscosity.

n: A thinning agent used to reduce viscosity or prevent flocculation;incorrectly called a dispersant. Most deflocculants are low-molecular weight anionic polymers that neutralize positive charges on clay edges. Examples include polyphosphates, lignosulfon

n: 1. (nautical) a volume measure equal to 100 square feet applied to mobile offshore drilling rigs. 2. a measure of weight equal to 2,000 pounds. 3. (metric) a measure of weight equal to 1,000 kilograms. Usually spelled tonne."