| O |
Oil. |
|
| O ring |
A circular pressure seal seated within an annular space. |
|
| O&G |
Oil and Gas. |
|
| OD |
Outside diameter, eg of casing or tubing |
|
| Oil |
A mixture of liquid hydrocarbons of different molecular weights. |
|
| Oil field |
A geographic area under which an oil reservoir lies. |
|
| Oil in place |
An estimated measure of the total amount of oil contained in a reservoir, and, as such, a higher figure than the estimated recoverable reserves of oil. |
|
| Open Hole |
A well either uncased or completed without casing in the production zone. |
|
| Operator |
The company that has legal authority to drill wells and undertake production of hydrocarbons are found. The Operator is often part of a consortium and acts on behalf of this consortium. |
|
| Opex |
Operating expenditure. |
|
