All members in the assembly used for rotary drilling from the swivel to the bit, including the kelly, drill pipe and tool joints, drill collars, stabilizers, and various specialty items. compare drill string.

The conventional method of formation testing. the basic drill stem test tool consists of a packer or packers, valve or ports that may be opened and closed from the surface, and two or more pressure-recording devices. the tool is lowered on the drill string to the zone to be tested. the packer or packers are [...]

The column, or string, of drill pipe with attached tool joints that transmits fluid and rotational power from the kelly to the drill collars and bit. often, especially in the oil patch, the term is loosely applied to both drill pipe and drill collars. compare drill stem.

Pressure of the annular fluid on the casing at the surface when a well is shut in.

An adaptive drilling process used to precisely control the annular pressure profile throughout the wellbore (iadc definition).

To move the drill stem up and down in the hole over a short distance without rotation. careless execution of this operation creates pressure surges that can cause a formation to break down, resulting in lost circulation.
To force a wireline tool or tubing down the hole by using a reciprocating motion.
To begin drilling [...]

The space between two concentric objects, such as between the wellbore and casing or between casing and tubing, where fluid can flow.
pipe may consist of drill collars, drillpipe, casing or tubing.

Additional wells drilled after a discovery, to confirm the size of a hydrocarbon deposit. normally used to run buildup tests, drill stem tests, top and bottom of formation, gather core or fluid samples or other evaluations.

The large wrenches used to make up or break out drill pipe, casing, tubing, or other pipe; variously called casing tongs, pipe tongs, and so forth, according to the specific use. power tongs are pneumatically or hydraulically operated tools that serve to spin the pipe up tight and, in some instances, to apply the final [...]

A heavy coupling element for drill pipe. it is made of special ahoy steel and has coarse, tapered threads and seating shoulders designed to sustain the weight of the drill stem, withstand the strain of frequent coupling and uncoupling, and provide a leakproof seal. the male section of the joint, or the pin, is attached [...]

A device run on cable-tool drilling line, a service machine, or sand line of a rotary rig to drill up tools, remove downhole debris, and so on.

A long, hollow cylinder, usually steel, through which fluids are conducted. oilfield tubular goods are casing (including liners), drill pipe, tubing, or line pipe

A block with lead or another relatively soft material on its bottom. it is made up of drill pipe or tubing at the surface, run into a well, and set down on the object that has been lost in the well. the block is retrieved and the impression is examined. the impression is a mirror [...]

The amount of pressure exerted inside the drill pipe as a result of circulating pressure, entry of formation pressure into the well, or both.

An indicator, mounted in the mud circulating system, that measures and indicates the amount of pressure in the drill stem. see drill stem.