Oil and gas glossary

Pumping acid to dissolve near-well damage or to dissolve the rock itself.

Steel pipe run into the well and cemented in place to hold the hole open and to isolate formations.

The hardware and the work that make a drilled well ready to produce or inject.

Extra resistance to flow in the rock or the completion within a short distance of the wellbore.

A sand-control completion that places sized gravel around a screen so formation sand bridges on the gravel.

A fracture opened by pumping fluid into a zone faster than the rock can accept it, then kept open so the well can flow.

A seal between the tubing and the casing that isolates the annulus from the producing or injection interval.

A tunnel from the wellbore through casing and cement into the formation, so fluid can enter or leave.

Solid grains pumped into a hydraulic fracture to hold it open after treating pressure is released.

Keeping formation sand in the formation instead of in the wellbore, the tubing, and the surface kit.

A dimensionless number from a well test that describes extra pressure drop at the sandface compared with an undamaged open hole in the same rock.

A treatment whose purpose is a higher rate from the same reservoir, usually by cutting skin or by adding a fracture.

The removable pipe inside the production casing that carries produced or injected fluids.