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Oil & gas
Terms concerning oil and gas as a fossil fuel and natural resource.
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Oil & gas > Drilling 
conductor pipe
Oil & gas; Drilling
The casing string that is usually put into the well first, particularly on land wells, to prevent the sides of the hole from caving into the wellbore. This casing, sometimes ...
casing shoe
Oil & gas; Drilling
The bottom of the casing string, including the cement around it, or the equipment run at the bottom of the casing string.
silicate anion
Oil & gas; Drilling
The anion, SiO 4 -4 , found in solutions of sodium and potassium silicate, formed by dissolving silica or silicate minerals in NaOH or KOH solutions. Silicate anions form ...
overbalance
Oil & gas; Drilling
The amount of pressure (or force per unit area) in the wellbore that exceeds the pressure of fluids in the formation. This excess pressure is needed to prevent reservoir fluids ...
underbalance
Oil & gas; Drilling
The amount of pressure (or force per unit area) exerted on a formation exposed in a wellbore below the internal fluid pressure of that formation. If sufficient porosity and ...
biochemical oxygen demand
Oil & gas; Drilling
The amount of oxygen consumed by biodegradation processes during a standardized test. The test usually involves degradation of organic matter in a discarded waste or an effluent.
chemical oxygen demand
Oil & gas; Drilling
The amount of oxygen needed to oxidize reactive chemicals in a water system, typically determined by a standardized test procedure. COD is used to estimate the amount of a ...
Sub-categories
- corrosion inhibition (0)
- Downhole (49)
- Drilling (9514)
- Environmental management (93)
- Fuel handling (16)
- Horizontal directional drilling (7)
- Offshore oil exploration (2047)
- Oil (4406)
- Oil & gas instrumentation (856)
- Oilfield (22159)
- Pipeline related (90)