Oil and gas production handbook An introduction to oil ... - ABB Group

Particular problems arise from the growth of sulfate
reducing bacteria that produces hydrogen sulfide and
clogs filters. Typical uses include diesel tanks,
produced water (after hydrocyclones), and slop and
ballast tanks.
Corrosion inhibitor Corrosion inhibitor is injected in export pipelines and
storage tanks. Exported oil can be highly corrosive,
leading to corrosion of the inside of the pipeline or
tank. The corrosion inhibitor protects by forming a thin
film on metal surfaces.
Drag reducers
Drag reducers improve the flow in pipelines. Fluid
near the pipe tries to stay stationary while fluid in the
center region of the pipe is moving quickly. This large
difference in fluid causes turbulent bursts to occur in
the buffer region. Turbulent bursts propagate and form
turbulent eddies, which cause drag.
Drag-reducing polymers are long-chain, ultra-high
molecular weight polymers from 1 to 10 million u), with
higher molecular weight polymers giving better drag
reduction performance. With only parts-per-million
levels in the pipeline fluid, drag-reducing polymers
suppress the formation of turbulent bursts in the buffer
region. The net result of using a drag-reducing
polymer in turbulent flow is a decrease in the frictional
pressure drop in the pipeline by as much as 70%. This
can be used to lower pressure or improve throughput.
8.9 Telecom
Traditionally, all electronic systems that do not fall naturally under the
electrical or automation bracket are grouped as telecommunication systems.
As such, the telecom system consists of a variety of subsystems for human
and computer wired and wireless communications, monitoring, observation,
messaging and entertainment.
Some of the main systems are:
· Public address and alarm system/F&G integration
· Access control
· Drillers talk-back system
· UHF radio network system
· Closed circuit TV system
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