ExxonMobil were seeking a cost-effective solution to conduct plug and abandonment (P&A) activities on 22 wells on the Jotun B platform.
The scope of work set out for the project speciﬁed:
The unit had to be lightweight and have as small a footprint as practicable
The unit required to be installed onto existing derrick footings
Have low POB requirements
Capable of workover and drilling operations
Comply with temporary equipment standards and be ﬁt for use in the Norweigan Continental Shelf
Mast self-erecting in part due to crane height limits
Petro Well Services AS (PWS) tendered with Halliburton recommending the provision of a modular unit solution for P&A operations. Off ering a concept design for a new breed of modular unit (Optimus), the proposal was accepted, developed and implemented over 14 months, providing:
A unit capable of drilling, P&A and workover operations with a hoisting system of 350Te pull
Low power consumption capable of running unit independently with portable power generation and minimal power integration to platform services
Easy interface with rig F&G, PA, platform general essential power and UPS supply requirements
Installed utilising specially designed interface beams between the Optimus and Jotun B.
Unit designed for full integration with existing or standalone mud system and pressure control unit
Extensively automated unit reducing exposure to injury
Low footprint and standalone modular unit capable of installation in 12T lifts
Compliance with latest relevant standards – incl. NORSOK Z015, DNVGL-OS-E101 and other applicable NORSOK standards
Low POB operations with multi-skilled team (5 dayshift and 5 nightshift with a further 2 at build stage)
Quick mobilisation, installation and interface integration to the platform
PWS successfully delivered and now operate a low cost, low POB, standalone P&A, drilling and workover unit, that can be promptly deployed, commissioned and integrated with an off shore platform. All targets set out by ExxonMobil were fulﬁ lled on time. All phases from design through to build, installation and commissioning were completed with no incident.
Current performance demonstrates tripping upto 30 super singles per hour with no LTI’s or reportable incidents throughout the build, commissioning and operations phases off shore and well ahead of planned schedule.
Bjørn Bjerke, CEO at Petro Well Services spoke at OWI 2018 about the Operator’s requirements for a cost-effective P&A solution for 22 wells with a lightweight, small footprint unit, compliant with NCS standards.
From 1 September 2016 to 25 August 2017 the PSA conducted an audit of ExxonMobil's activities relating to module-based drilling facilities and permanent plugging and abandonment of the wells at the Jotun B facility.