Oil & gas

Oil & gas

Terms concerning oil and gas as a fossil fuel and natural resource.

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Oil & gas > Drilling

surface tension

Oil & gas; Drilling

Surface free energy that exists between a liquid and air. Surface tension can be observed as a curved meniscus in a small tube of the liquid. This energy barrier prevents a liquid ...

American Society for Testing and Materials (ASTM)

Oil & gas; Drilling

Some API procedures for drilling fluids are similar to ASTM procedures.

bridging material

Oil & gas; Drilling

Solids added to a drilling fluid to bridge across the pore throat or fractures of an exposed rock thereby building a filter cake to prevent loss of whole mud or excessive ...

colloidal solids

Oil & gas; Drilling

Solid particles of size less than 2 microns equivalent spherical diameter, also identified as clay by definitions in International Standards Organization ISO/CD 13501, par. 3. 1. ...

lost circulation material

Oil & gas; Drilling

Solid material intentionally introduced into a mud system to reduce and eventually prevent the flow of drilling fluid into a weak, fractured or vugular formation. This material is ...

cuttings

Oil & gas; Drilling

Small pieces of rock that break away due to the action of the bit teeth. Cuttings are screened out of the liquid mud system at the shale shakers and are monitored for composition, ...