Type:
Oil
Facility:
Production
Water Depth:
7
Installed:
1996
meters
Block:
110/15a
Design:
Fixed steel
Sub Structure:
451
Topsides Wgt:
1195
tonnes
tonnes
Intro
Lennox is a fixed offshore wellhead platform in the East Irish Sea, developed as part of the Lennox oil and gas field in UK Blocks 110/14c and 110/15a. It was brought on stream in 1996 and produces oil, associated gas and gas condensate. Lennox exports fluids via subsea pipeline to the adjacent Douglas Complex for processing and export.
Field
The Lennox field lies in the East Irish Sea basin, discovered in 1992 with production commencing in 1996. It contains an oil rim overlain by a substantial gas cap in a rollover anticline structure within Triassic Ormskirk Sandstone reservoirs. Development focussed on horizontal oil producers with associated gas handling; oil production ceased in the early 2010s with continued gas export.
Facilities
Lennox comprises a steel-jacket wellhead structure supporting multiple horizontal production wells with gas lift and injection where required. Well fluids (oil, gas and water) are routed via subsea flowlines to the Douglas Complex reception manifolds; there is no major separation or export equipment on Lennox itself. At Douglas, three-phase separation splits oil, gas and produced water; gas is compressed and metered for export via the Liverpool Bay export system, and oil is stabilised before export or transfer to storage. Produced water is treated to regulatory limits before overboard discharge. Lennox utilities are limited to well control, power distribution and remote communications via umbilical to Douglas; major processing and export infrastructure reside at the host complex.
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