MOLIKPAQ DRILLING AND OIL PRODUCTION PLATFORM

Project:
Re-lining of 12 seawater supply wells on an offshore oil drilling and production platform

Location:
Near Sakhalin Island, east coast of Russia

Product:
Boode Select Screen and Casing

Outline:
Re-lining of seawater supply wells to 45 metres following the failure of existing stainless steel screen and casing due to sand ingress and corrosion

Description:
The Molikpaq drilling and oil production platform is an ice-resistant structure located near Sakhalin Island off the east coast of Russia. A system of 12 seawater supply wells within the sand core supports the production capacity of 90,000 barrels per day (14,000 m 3 /d) of oil.

The seawater supply wells were drilled and tested in 2002 and were designed to produce around 200m3 /hr. The casing and screen originally installed was 14" epoxy coated mild steel casing and Inconnel alloy screen (a Nickel, Chromium and Molybdenum alloy) with a planned design life of 30 years in a corrosive seawater environment. In 2005 after just three years in production, performance of the supply wells started to deteriorate. Investigations by Sakhelin Energy Investment Company (SEIC) revealed the stainless steel screen and casing in the wells was silted up, as a result of sand ingress and corrosion, diminishing the yield and compromising the entire platform operation.

Boode were invited to recommend a solution using Boode PVC screen and casing. In 2006, SEIC installed Boode Select PVC screen and casing (280 x 255mm) with a slot size 0.75mm to a depth of 45 metres. Also, on the recommendation of Boode, Wellmaster Flexible Rising Main was also installed. All Boode PVC screen and casing is corrosion resistant with an estimated life span of more than 50 years. The Molikpaq platform has remained fully operational since the re-lining operation was carried out.



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