Integrity Assessment and Redeployment of Existing Mobile Offshore Production Unit for a Marginal Field Development
- Abe Nezamian (WorleyParsons) | Dennis Vuckovic (WorleyParsons) | Robert J. Nicolson (WorleyParsons)
- Document ID
- International Society of Offshore and Polar Engineers
- The 26th International Ocean and Polar Engineering Conference, 26 June-2 July, Rhodes, Greece
- Publication Date
- Document Type
- Conference Paper
- 2016. International Society of Offshore and Polar Engineers
- Structural Integrity, Mobile Oil Production Unit, Fast Track, Integrity Assessment, Marginal Field, Re-deployment
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Redeployment of existing idle or close to end of lease mobile production units can provide a viable option to address financial and delivery time challenges for development of marginal field or revitalisation of the end of life for production assets. The deployment of an existing MOPU readily meets these requirements with a potentially faster upgrade, integrity assessment and modification project timetable as opposed to conventional new build Facility. It also typically will have a simpler installation procedure and minimal abandonment costs. There are examples of this type project being delivered from formal project kick off to production in less than a year. The challenges for this type of project are managing the technical aspects of integrity assessment and modification of topside layout, fast track delivery of either new or refurbished long lead equipment packages and structural integrity and refurbishment of the existing unit to a site specific fixed structure under a specific class notation. The requirements for the site specific structure are location dependent and may include environmental and geotechnical conditions that the original MODU structure and initial conversion to MOPU was not intended to operate in.
This paper provides an overview of the challenges and discusses various aspects of a redeployment project represented risk to the integrity of a facility and the required inspection and repair and verification requirements for assessment and maintaining the facility integrity. This paper also provides an overall view in using the inspection and site specific characteristic data for calibrations/validations of the original design and then initial conversion to maintain the safety level as ALARP. Integrity assessment, application and cost benefits assessments of a deployment project of an existing MOPU is presented for a gas export project marginal field development.
Since 1960, mobile offshore units have been operational mainly for the offshore oil and gas industry and specifically as Mobile Drilling Units (MODU). A wide variety of proven technology and design techniques has been applied for these units to be operational in the dynamic environment of open seas and deep waters. In the last 50 years, many concepts developed for converting MODUs to self-installing and re-usable production jack-ups or MOPU’s. All are based upon the proven jack-up and topsides design technologies available within the oil and gas drilling industry.
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