The amount of pressure that, when applied inside a string of casing, causes the wall of the casing to fail.

This pressure is critically important when a gas kick is being circulated out, because gas on the way to the surface expands and exerts more pressure than it exerted at the bottom of the well.

A circular device with a frictional gripping arrangement of slips and packing rings used to suspend casing from a casinghead in a well

A tool composed of a mandrel on which are mounted several heavy-duty rollers with eccentric roll surfaces.

It is used to restore buckled, collapsed, or dented casing in a well to normal diameter and roundness.

Made up on tubing or drill pipe and run into the well to the depth of the deformed casing, the tool is rotated slowly, allowing the rollers to contact all sides of the casing and restore it to roughly its original condition.

Large wrench used for turning when making up or breaking out casing.

See tongs.

The bottom of the casing string, including the cement around it, or the equipment run at the bottom of the casing string.

see also guide shoe

See casing-patch tool

A perforating gun run in on the casing string.

A short threaded nipple screwed into the open end of the coupling and over the threaded end of casing to protect the threads from dirt accumulation and damage.

It is made of steel or plastic.

Also called thread protector.

Abbreviation: circulating bottomhole temperature

A tubular section of pipe that is threaded inside and used to connect two joints of casing.

1.

The ramp at the side of the drilling rig where pipe is laid to be lifted to the derrick floor by the catline or by an air hoist.

2.

Any elevated walkway
3. a long, rectangular platform about 3 ft [0.9 m] high, usually made of steel and located perpendicular to the vee-door at the bottom of the slide.

This platform is used as a staging area for rig and drillstring tools, components that are about to be picked up and run, or components that have been run and are being laid down.

A catwalk is also the functionally similar staging area, especially on offshore drilling rigs, that may not be a separate or raised structure.

The character or state of the drilling mud filter cake.

From api rp 13b: notations such as “hard,” “soft,” “tough,” rubbery,” and “firm” may be used to convey some idea of cake consistency.

1.

A record showing variations in wellbore diameter by depth, indicating undue enlargement due to caving in, washing, or other causes.

The caliper log also reveals corrosion, scaling, or pitting inside tubular goods.

2.

A representation of the measured diameter of a borehole along its depth.

Caliper logs are usually measured mechanically, with only a few using sonic devices.

The tools measure diameter at a specific chord across the well.

Since wellbores are usually irregular (rugose), it is important to have a tool that measures diameter at several different locations simultaneously.

Such tools are called multi-arm calipers.

Drilling engineers or rigsite personnel use caliper measurement as a qualitative indication of both the condition of the wellbore and the degree to which the mud system has maintained hole stability.

Caliper data are integrated to determine the volume of the openhole, which is then used in planning cementing operations.

A special wrench designed for use in connecting the cage of a sucker rod pump to the sucker rod string.

A beam or beams that project outward from a structure and are supported only at one end.