Type:
Gas
Facility:
Production
Water Depth:
31
Installed:
1986
meters
Block:
49/25
Design:
Fixed steel
Sub Structure:
1106
Topsides Wgt:
4358
tonnes
tonnes
Intro
A fixed steel-jacket wellhead and compression platform in the Sean gas field (Block 49/25a) in the UK Southern North Sea, installed in 1985. Bridge-linked to the Sean South PP production platform, it houses wellheads and compression modules. (turn0search23)
Field
The Sean gas field comprises North, South and East accumulations in Rotliegendes sandstone about 109-km northeast of Lowestoft. Discovered 1969–1970, the field began production in 1986 with infrastructure engineered for UK gas export. (turn0search23)
Facilities
Sean South PD contains twelve well slots, with typically ten producing at a time, and hosts compressors to ensure adequate pressure to meet pipeline export specifications. Well fluids are routed to PD separation trains where gas is conditioned and then passed to the adjacent Sean South PP platform across a bridge link for further processing and export. Compression modules handle lift and export pressure duties to overcome friction and reservoir declines. PD structural elements include a six-leg steel jacket in ~30-m water depth, drill support interfaces, flowline manifolds, and subsea tie-in risers. Utilities comprise electrical power distribution, firewater systems, control systems (DCS/SCADA), and safety instrumentation. PD’s compression helps maintain field deliverability and interfaces with export pipelines tied back to the Bacton Gas Terminal via the PL311 trunkline (~30- diameter, 106.5-km). PD’s well control supports extended reach wells from Ryan/Matthew type producers. (turn0search23)
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