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| Recovery Factor |
Ratio of recoverable oil and / or gas to estimated oil and / or gas in place in reservoir. Determined by a various factors such as reservoir dimensions, pressure, nature of hydrocarbons, and development plan. (see also Primary, Secondary and Tertiary Recovery.) |
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| Redetermination |
Retroactive adjustment to relative percentage interests of joint ventures in a field. |
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| Reserves: Possible |
Reserves at present cannot be regarded as "probable". |
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| Reserves: Probable |
Reserves not yet "proven", but are estimated to have a better than 50% chance of being technically and economically producible. |
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| Reserves: Proven |
Reserves which on available evidence are virtually certain to be technically and economically producible. |
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| Reservoir drive |
Powered by difference in pressures within reservoir and well. |
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| Reservoir engineering model |
Used to predict reservoir behavior during production to enable selection of most efficient method of recovery. |
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| Satellite Installation |
An offshore structure that depends on another installation for materials or services. |
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| Secondary Recovery |
Recovery of hydrocarbons from a reservoir by increasing reservoir pressure by injecting gas or water into reservoir rock. (see also Primary and Tertiary Recovery.) |
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| Slug catcher |
Plant installed in a gas pipeline system to catch unwanted "slugs" of liquid. |
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| Sub-sea wellhead |
A wellhead installed on the sea floor and controlled remotely from a platform, a floating production facility or land. |
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| Subsea manifolds |
Allows wells to be put on production without need to build a platform to operate and maintain wells. |
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| Substructure |
Support form of an offshore installation on which derrick, engines, helicopter pad, cranes, etc. are installed. |
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