1.

The process of lowering the drill stem into the wellbore when the well is shut in on a kick and when the weight of the drill stem is sufficient to overcome the force of well pressure.

2.

The process of putting tubing into a well under pressure.

A blowout preventer placed on the seafloor for use by a floating offshore drilling rig.

1.

A rubber disk surrounding drill pipe or tubing that removes mud as the pipe is brought out of the hole.

2.

The pressure-sealing element of a stripper blowout preventer see stripper head.

A crystalline acid derived from sulfuric acid that is sometimes used in acidizing.

A retrievable tool used to suspend drilling temporarily during a storm offshore.

A fixed ball-and-seat valve at the lower end of the working barrel of a sucker rod pump.

The standing valve and its cage do not move, as does the traveling valve.

Compare traveling valve.

A rotational shear viscometer used for measuring the viscosity and gel strength of drilling fluids.

This instrument has been largely superseded by the direct-indicating viscometer.

Oil as it exists at atmospheric conditions in a stock tank.

Stock tank oil lacks much of the dissolved gas present at reservoir pressure and temperatures.

A surge valve.

The lowering of pipe or tubing into the bore of a downhole tool.

A tubing safety valve.

Any process undertaken to enlarge old channels or to create new ones in the producing formation of a well (e.g., acidizing or formation fracturing).

The electrokinetic portion of the spontaneous potential electric-log curve that can be influenced significantly by the characteristics of the filtrate and mud cake or the drilling fluid that was used to drill the well.

Opposite of dynamic.

See quiescence.

A heavy-mandrel service squeeze tool with on-off tool used in drilling operations during storm interruptions.