Oil & Gas Terms in Category P


A system of connected lengths of pipe, usually buried in the earth or laid on the seafloor, that is used for transporting petroleum and natural gas.

Pipeline oil

Oil clean enough to be acceptable to transport or purchase.


A rod-like or tube-like extension below a downhole tool, such as a mill, that serves to guide the tool into or over another downhole tool or fish.

Pipe ram

A sealing component for a blowout preventer that closes the annular space between the pipe and the blowout preventer or wellhead.

Pipe hanger


A circular device with a frictional gripping arrangement used to suspend casing and tubing in a well.


A device used to support a pipeline.

Pit-level indicator

One of a series of devices that continuously monitor the level of the drilling mud in the mud tanks.

The indicator usually consists of float devices in the mud tanks that sense the mud level and transmit data to a recording and alarm device (a pit-volume recorder) mounted near the driller’s position on the rig floor.

If the mud level drops too low or rises too high, the alarm sounds to warn the driller of losing circulation or a kick.

Plastic fluid

A complex, non-newtonian fluid in which the shear force is not proportional to the shear rate.

Most drilling muds are plastic fluids.

Pig iron

What a large heavy piece of equipment is said to be made of.


A temporary containment, usually excavated earth, for wellbore fluids.


A long, hollow cylinder, usually steel, through which fluids are conducted.

Oilfield tubular goods are casing (including liners), drill pipe, tubing, or line pipe


Abbreviation: an indicator of the acidity or alkalinity of a substance of solution, represented on a scale of 0-14, 0-6.9 being acidic, 7 being neither acidic or basic (i.e., neutral), and 7.1-14 being basic.

These values are based on hydrogen ion content and activity.



A flow line clearing device, pumped through the line with normal flow.


A scraping tool that is forced through a pipeline or flow line to clean out accumulations of wax, scale, and debris from the walls of the pipe.

It travels with the flow of product in the line, cleaning the pipe walls by means of blades or brushes affixed to it.

Also called a line scraper or a go-devil.


A batching cylinder with neoprene or plastic cups on either end and used to separate different products traveling in the same pipeline.


A neoprene displacement spheroid, automatically launched and received, used to displace liquid hydrocarbons from natural gas pipelines.


In hydrostatic testing of a pipeline, a scraper used inside the line to push air out ahead of the test water and to push water out after the test.

Packer test

A fluid-pressure test of the casing.

Also called a cup test.

Perforated liner

A liner that has had holes shot in it by a perforating gun.

See liner.

Permeability (of a reservoir rock)

The ability of a rock to transmit fluid through the pore spaces.

- a key influence on the rate of flow, movement and drainage of the fluids.

There is no necessary relation between porosity and permeability.

A rock may be highly porous and yet impermeable if there is no communication between pores.

A highly porous sand is usually highly permeable.

A measure of the ease with which a fluid flows through the connecting pore spaces of rock or cement.

The unit of measurement is the millidarcy.

Fluid conductivity of a porous medium.

Ability of a fluid to flow within the interconnected pore network of a porous medium.