New coating offers greater weather protection

Jon Lawson

Hardide Coatings has provided a coating solution for a new tool that could save oil and gas operators millions of pounds per year by extending weather windows for drilling operations.

Well construction specialist DeltaTek Global selected the Hardide CVD (chemical vapour deposition) tungsten carbide-based coating for the key component of its new ArticuLocktool. ArticuLock provides operators with longer weather windows to deploy subsea hardware and improve operational reliability by removing bending fatigue in subsea running tools and landing strings.

The Hardide-T CVD tungsten coating was used on the key component of the tool, a complex shaped ball and socket pivot joint, which is subject to extreme loads of up to 400 tonnes, 5000 psi of working pressure and 30,000 ft.lbs of torque while operating in severe wind, wave and current environments.

Delays due to bad weather costs operators £400 million per year in the UK alone and up to 20% of drilling budgets are allocated to waiting on weather. Use of ArticuLock will allow operators to run tools in weather environments where previously drilling would have been suspended. It can increase operable wave heights by 400%, from up to 1m to up to 4m.

The severe operating conditions meant that a hard-wearing coating was needed for the pivot joint body which is manufactured in AISI 4330V alloy steel, widely used in the oil and gas sector. The complex grooved geometry on the ball of the pivot joint body presented a further challenge to achieving the necessary post-coat surface finish.

Hardide Coatings is also supporting DeltaTek on its Seacure cementing tool that will be field tested west of Shetland in early 2019.

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