Drilling

Drilling

Of or relating to the penetration of the Earth's surface in order to extract petroleum oil.

Industry: Oil & gas

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Drilling

acrylamide-acrylate polymer

Oil & gas; Drilling

A linear copolymer of acrylate (anionic) and acrylamide (nonionic) monomers, also called partially-hydrolyzed polyacrylamide (PHPA). The ratio of acrylic acid to acrylamide groups on the polymer ...

A lignosulfonate that has been treated by mixing or reacting into the molecular structure some form of chromium (either chromate or chromic salt). Although still used today in less environmentally ...

chrome lignite

Oil & gas; Drilling

A lignite that has been treated (admixed or reacted with) chromic or chromate salt, such as potassium or sodium chromate or dichromate or chromic chloride. Also, chrome lignite may contain added ...

organophilic lignite

Oil & gas; Drilling

A lignite that has been coated with a chemical that renders it dispersible in oil. The treatment is usually accomplished with a type of quaternary amine compound.

intermediate casing string

Oil & gas; Drilling

A length of pipe used below the surface casing string, but before the production casing is run, to isolate one or more zones of the openhole to enable deepening of the well. There may be several ...

spinning chain

Oil & gas; Drilling

A length of ordinary steel link chain used by the drilling crew to cause pipe being screwed together to turn rapidly. This is accomplished by first carefully wrapping the chain around the lower half ...

surface casing

Oil & gas; Drilling

A large-diameter, relatively low-pressure pipe string set in shallow yet competent formations for several reasons. First, the surface casing protects fresh-water aquifers onshore. Second, the surface ...