Emergency disconnect package: Difference between revisions
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An ''The Emergency Disconnect Package'' (EDP) is a piece of equipment used in the drilling and work-over (servicing or modification) of deep sea oil & gas wells, by Mobile Offshore Drilling Rigs (MODU's) and Well Intervention Vessels (WIV's). The EDP is designed for use in an emergency, when the MODU or WIV needs to quickly disconnect, and move away from the oil/gas well that it is drilling or working-over. Examples of when this might be necessary include unexpected extreme weather that exceeds the MODU/Vessel's capability to maintain its position. |
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''The Emergency Disconnect Package'' (EDP) is designed for an emergency |
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Under normal operating conditions, the MODU/WIV (which is floating on the sea surface) is connected to the oil/gas well (which is drilled in the sea bed) by a vertical (or near-vertical) piece of steel pipe, called a marine riser. Tools and fluids are moved within the marine riser as required to/from the well. At the bottom of he marine riser, the EDP and other components that connect the riser to the well and allow the well to be shut-in when required, constitute a 'Lower Riser Package' (LRP). |
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allowing the completion/intervention vessel(also known as a [[well intervention]] vessel to disconnect from the subsea well while under load with a high disconnection angle.The EDP is used within what is called a workover system. A workover system is basically a series of valves and high strength pipe connecting a floating drilling rig to the subsea Christmas tree. |
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When required to do so, the EDP disconnects from the LRP and isolates the riser from the environment. Thus the EDP allows the MODU/WIV to safely and quickly disconnect from the subsea well and move away in an emergency. The EDP is designed to carry out its function while under load with a high disconnection angle. |
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An EDP consists of a connector to the rest of the LRP, an isolation valve, an accumulator, a subsea control module and a connection point at the top for connection to the riser pipe. A production retainer valve shuts in the riser and the annulus master valve shuts in the riser. A crossover valve allows circulation of the riser after disconnection. |
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A production retainer valve shuts in the riser and the annulus master |
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<refs. IADC Drilling Lexicon / API RP 17G, Recommended Practice for Completion/Workover Risers / API RP 96, Deepwater Well Design and Construction / GSO Engineering> |
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valve shuts in the riser. A crossover valve allows circulation of the riser |
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after disconnection.A Heavy Completion / Intervention System includes Lower Riser Package, Emergency Disconnect Package, riser joints, specialty riser joints, tensioner system and surface tree. |
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==External links== |
==External links== |
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* [http://www.fmctechnologies.com/en/SearchResults.aspx?q=WAS_REV043008&r=%7b0FB15A84-0F7E-4776-A16A-A2C81BAEF397%7d] |
* [http://www.fmctechnologies.com/en/SearchResults.aspx?q=WAS_REV043008&r=%7b0FB15A84-0F7E-4776-A16A-A2C81BAEF397%7d] |
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Revision as of 10:17, 22 January 2016
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An The Emergency Disconnect Package (EDP) is a piece of equipment used in the drilling and work-over (servicing or modification) of deep sea oil & gas wells, by Mobile Offshore Drilling Rigs (MODU's) and Well Intervention Vessels (WIV's). The EDP is designed for use in an emergency, when the MODU or WIV needs to quickly disconnect, and move away from the oil/gas well that it is drilling or working-over. Examples of when this might be necessary include unexpected extreme weather that exceeds the MODU/Vessel's capability to maintain its position. Under normal operating conditions, the MODU/WIV (which is floating on the sea surface) is connected to the oil/gas well (which is drilled in the sea bed) by a vertical (or near-vertical) piece of steel pipe, called a marine riser. Tools and fluids are moved within the marine riser as required to/from the well. At the bottom of he marine riser, the EDP and other components that connect the riser to the well and allow the well to be shut-in when required, constitute a 'Lower Riser Package' (LRP). When required to do so, the EDP disconnects from the LRP and isolates the riser from the environment. Thus the EDP allows the MODU/WIV to safely and quickly disconnect from the subsea well and move away in an emergency. The EDP is designed to carry out its function while under load with a high disconnection angle. An EDP consists of a connector to the rest of the LRP, an isolation valve, an accumulator, a subsea control module and a connection point at the top for connection to the riser pipe. A production retainer valve shuts in the riser and the annulus master valve shuts in the riser. A crossover valve allows circulation of the riser after disconnection. <refs. IADC Drilling Lexicon / API RP 17G, Recommended Practice for Completion/Workover Risers / API RP 96, Deepwater Well Design and Construction / GSO Engineering>
External links
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