In this paper the overall methodology to integrate a flow assurance process into an on field development has been proposed. The methodology is based on the rational use of flow modelling to obtain reliable data for System Operability Design, to guarantee and optimise field production during all operative field life. The main items on which the proposed methodology is based are the following:
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Integrated Production System Identification. The Production System is considered as a single entity from reservoir to topside (including process equipment)
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Operative Scenario Definition. Relevant operating scenario characterising the considered system layout are identified to optimize system design process for selected requirements
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System Behaviour Characterization. Extensive transient analyses are performed to fully understand system behaviour and design robustness under previous defined conditions
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Production Management Strategy. Nominal, off-normal or unexpected operations are evaluated and analysed and the results are used to set up an integrated strategy, based on production system capabilities, to manage solid and liquid accumulation, as well as to mitigate flow instabilities
The above mentioned items are reached applying a four step operative approach, defined as follow:
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Flow Modelling Qualification (numerical and physical computer models assessment, as well as user analyst qualification against real data)
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Field Layout Deliverability Verification (Capabilities of the system to maintain required production and avoid hydrate and wax deposition during steady conditions)
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Field Layout Operability Verification (Blowdown effectiveness, Production Restart Capability)
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Field Management Strategy Identification (based on prevention, mitigation and remediation actions, to manage flow blockage/interruptions/instabilities) and Field Management Plan (Operative Procedures) definition
The presented methodology has been tested and extensively applied for ENI E&P both in deepwater oil fields (Aquila and ABO fields), and for several gas and gas condensed offshore/onshore developments (Egypt, Nigeria)
