OBEN GAS DEVELOPMENT PROJECT
OBEN GAS DEVELOPMENT PROJECT
OBEN GAS DEVELOPMENT PROJECT
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Chapter Two Project Justification<br />
liquids in a Free Liquid Knock-out Vessel (FLKO). Liquids from the FLKO vessels are separated in a<br />
three-phase classifier vessel into water, condensate and gas. Water is spiked into the oil saver pit.<br />
Condensate is sent to the condensate header, from where condensate can be routed to the condensate<br />
surge vessel or to existing Oben flowstation. Condensate routed to the surge vessel and flow station is<br />
pumped to the trunkline enroute to Forcados Terminal.<br />
Gas from the FLKO vessel passes through the inlet/sales gas heat exchanger, and is cooled to about<br />
9 o C, choked to 76-bar at the main choke valves. 75% by weight Diethylene Glycol (DEG) is injected<br />
upstream of the heat exchanger to inhibit hydrates downstream of the choke valves. Gas at 76-bar after<br />
choking enters the LTS separator via the hydrate Catcher. It is the low temperatures achieved in the<br />
LTS, below zero degree centigrade under normal operation, by the Joule Thompson effect that is the<br />
dew point control mechanism. Gas out of the LTS separator is sent into a 16-inch sales gas header,<br />
where it is metered via a senior Daniel orifice (DOF) meter connected to chart recorders. The gas from<br />
the sales gas header goes into the Escravos Lagos Pipeline System (ELPS) line.<br />
Feed Gas<br />
Figure. 2.2: Schematic of the Oben LTS Modules<br />
2.7 Project Scope<br />
FLKO<br />
Classifier<br />
Glycol<br />
Injection<br />
Gas/Gas<br />
Exchanger<br />
JT Valve<br />
Glycol/Cond.<br />
Glycol/Cond.<br />
Separator<br />
Separator<br />
Sales Gas<br />
2.7.1 Project Activity Overview<br />
The Workscope covered by this EIA for the WAGP Gas Supply is divided into two phases;<br />
Phase 1 works: This includes integrity related works covering upgrade of the process control system<br />
and modifications of Oben Gas Plant, necessary to deliver the contractual gas specification which is<br />
scheduled for completion in December 2006.<br />
Phase 2 works covers installation of smart-type metering/monitoring skids at custody transfer point at<br />
Oben Gas Plant with online flow computers, online gas chromatograph and V-SAT data transmission<br />
2-4<br />
LTS<br />
Glycol Regen<br />
To Flare<br />
Condensate<br />
Surge<br />
Vessel<br />
To Flow Station
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