Page 43: of Offshore Engineer Magazine (Jun/Jul 2014)

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Production

The oil separation train in fabrication.

Procegas / obax-seme ?eld feed

The free water knock out vessel

Stack

Vertical Vane mist Inlet shroud Production Gas Transformer in fabrication at ProSep’s inlet extractor rlectrostatic outlet grids fabrication facility in Houston.

Photos from PWA ProSep.

Gas

Oil

Oil weir box elements. The treating temperature for

Oil

Water a thermal treater is considerably higher

Oil outlet than that for an FWKO, in order to meet

Natural draft

Transverse gas burner

Water the stricter water content specifcation of ba•e c/w

TECHNOLOGIES allow Benin feld

Sand

Distribution Firetube Mechanical Water vortex water weir system ba•es coalescers outlet breaker 0.5% BS&W, by removing the remaining and siphon emulsifed water from the process stream.

to produce oil for frst time in over a decade

Thermal electrostatic treater

Gas

Production

Inlet slotted "T" Vane mist

Water treatment outlet inlet distributor extractor

ProSep was tasked with treating

Gas 11,000bbl/d of water with a 2000 ppm

Oil

Gas inlet 100 ppm inlet solids. Charge pumps

Oil

Oil will be provided to pump the water from

Oil outlet

Water the storage tank to the frst water treat-

Triple wall Water ment vessel, which is a corrugated plate

Quieting distribution Water vortex ba•e interceptor (CPI).

ba•e outlet breaker

CPIs are designed to provide the same The vessel schematics. Image from PWA ProSep.

removal effciency as a traditional gravity end of this year. In May, the fabrication

Legacy separator in a much smaller vessel, making

The government’s requirement is that will be taking place in the US and the them ideal for fxed-platform as well as the feld needs to have at least 20 years preparations will be taking place at the land-based installations. In this application, life expectancy. But, after fve years, feld in Benin. 95% of solid particles greater than 5micron

SAPETRO need to start producing will be removed from the inlet stream.

As the water exits the CPI, there is a from a second block, as the amount of Vince Buchanan is secondary stage of treatment; an induced water produced from the current block ProSep’s Oil gas fotation (IGF) vessel. To recover will continue to increase while the oil Technology Manager, oil and condition water for overboard decreases. After fve years, there will be based in the com- discharge, re-injection or further polish- less than 1000bo/d so the longevity will pany’s Houston ing through fltration, ProSep’s ProFloat need to come from another block. offce. He has worked

Flotation Systems is used for effcient This is the frst time ProSep technology for ProSep since its removal of oil and solids (capacities from will be used in West Africa. The contract inception in 2005 3000-100,000bbl/d of water, with a sepa- includes training local staff. About 20 and has over 40 years’ experience in the ration effciency of up to 98%), while workers are expected to be involved in oil and gas industry. completely containing the process. This the operations and maintenance, on and is where the stringent discharge quality offshore. Almost 1000 Benin workers will

FURTHER READING of 20ppm of oil in the water will be met, be involved in the construction phase which is now common law environmen- and around 50 people will be working on Read more about the Sèmè minimal tal regulation in West Africa following the operations. facilities, conductor supported platform, years of pollution. Sèmè is due to be operational by the see page 42.

oedigital.com June 2014 | OE 45 044_OE0614_ProdOps3-PWA.indd 45 5/22/14 9:29 PM