SubSea Modeling Example
SubSea Modeling Example by Gerrit Muller HBV-NISE e-mail: [email protected] www.gaudisite.nl Abstract This presentation provides an example of modeling in the subsea domain. assembly, functional test perform workover operations run EDP/LRP retrieve coil tubing and wireline BOP 1 2 run risers unhook coil tubing and wireline BOP hook up SFT and TF ROV assisted disconnect move above well move away from well ROV assisted connect retrieve SFT and TF 3 Distribution This article or presentation is written as part of the Gaudí project. The Gaudí project philosophy is to improve by obtaining frequent feedback. Frequent feedback is pursued by an open creation process. This document is published as intermediate or nearly mature version to get feedback. Further distribution is allowed as long as the document remains complete and unchanged. November 13, 2014 status: preliminary draft version: 0.4 7 rig TF wireline coil tubing BOP SFT 8 vessel or platform 4 5 6 7 9 riser 10 hook up coil tubing and wireline BOP retrieve risers system function and connection seal test retrieve EDP/LRP run coil tubing and wireline disassembly EDP 11 12 LRP XT well head well WOCS Colophon The examples in this presentation are based on the work of SEMA participants: Martin Moberga, Tormod Stranda, Vazgen Karlsenf, and Damien Weef, and the master project paper by Dag Jostein Kleverf. Sensitive and confidential information is removed or obfuscated. All mistakes are to be blamed to the author. Gunnar Berge stimulated the creation of a subsea example. a Aker Solutions f FMC Technologies SubSea Modeling Example 2 Gerrit Muller version: 0.4 November 13, 2014 SSMEcolophon Story: Workover Anno 2015 well 1 harbor On September 4, Captain Frode Johansen was discussing the plans for the upcoming workover of South Gulfaks (see http://www.npd.no/en/Publications/ Facts/Facts-2011/Chapter-10/Gullfaks-Sor-/) with his crew. Their vessel had been out of operation for recertification of the equipment much longer than anticipated, so there was a lot of pressure from Statoil on their schedule. Statoil sees diminishing production in several of the wells, so workover operations are urgent. With the upcoming fall and winter storms, Frode hopes to finish the next three workover operations in a new record time. The equipment supplier had not only recertified all equipment, but also renovated parts of the riser system allowing for faster deployment and retrieval. The supplier tested and installed equipment in Horten. Tomorrow they will arrive in Sotra, their company support station. Here they will stock their fuel, food, coiled tubing, and other material. The weather forecast shows a depression close to Iceland that moves slowly in Norway’s direction. If they can start deployment of the riser on September 7, then they probably finish the workover before the storm associated with the depression is too severe. Since the schedule is so tight, the captain proposes to preassemble the riser system as far as possible while traveling. In addition, the accumulators can already be charged. The captain asks the foreman to make a schedule and to allocate tasks to the crew. Safety will be a key attention point, since working with such equipment with sea state 3 provides risks. SubSea Modeling Example 3 Gerrit Muller version: 0.4 November 13, 2014 SSMEstory Annotated Physical Diagram of WorkOver System rig tension frame connects riser to rig tension system surface flow tree provides well control TF SFT vessel or platform wireline coil tubing BOP provides well control WOCS work over control system monitoring and control of subsea installation riser conduit for running tools to well ROV emergency disconnect package provides disconnect function Xmas tree provides well control EDP ROV remotely operated vehicle one for observation one for operation LRP lower riser package provides well control function XT well head structural and pressurecontaining interface well SubSea Modeling Example 4 Gerrit Muller version: 0.4 November 13, 2014 SSMEworkoverPhysicalAnnotated Typical Workover Operation assembly, functional test perform workover operations run EDP/LRP retrieve coil tubing and wireline BOP run risers unhook coil tubing and wireline BOP 1 2 3 hook up SFT and TF ROV assisted disconnect move above well move away from well 7 rig TF wireline coil tubing BOP SFT 8 vessel or platform 4 5 ROV assisted connect 6 riser 9 retrieve SFT and TF 10 hook up coil tubing and wireline BOP retrieve risers system function and connection seal test retrieve EDP/LRP run coil tubing and wireline disassembly EDP 11 LRP XT well head 12 well 7 SubSea Modeling Example 5 Gerrit Muller version: 0.4 November 13, 2014 SSMEtypicalWorkoverOperation WOCS Typical Workover Operation as Cartoon rig 1 rig 2 TF 3 TF rig 4 TF rig 5 TF EDP SFT LRP WOCS SFT rig 6 TF TF SFT WOCS vessel or platform rig WOCS vessel or platform SFT vessel or platform WOCS SFT vessel or platform WOCS vessel or platform SFT WOCS vessel or platform EDP LRP riser EDP EDP LRP LRP EDP LRP 7 rig vessel or platform EDP ROV LRP ROV XT well head XT well head XT well head XT well head XT well head XT well head well well well well well well 8 TF SFT riser 9 rig TF WOCS SFT rig 10 rig 11 TF rig 12 TF rig TF TF WOCS vessel or platform SFT WOCS vessel or platform SFT SFT EDP SFT WOCS WOCS LRP WOCS vessel or platform vessel or platform vessel or platform EDP LRP riser riser EDP EDP LRP LRP EDP EDP LRP LRP XT well head XT well head XT well head XT well head XT well head XT well head well well well well well well SubSea Modeling Example 6 Gerrit Muller ROV version: 0.4 November 13, 2014 SSMEtypicalWorkoverOperationCartoon Typical Workover Operation on Timeline assumptions: running and retrieving risers: 50m/hr running and retrieving coiled tubing/wireline: 100m/hr preparation 36 hrs stop production 24 72 96 hours SubSea Modeling Example 7 Gerrit Muller version: 0.4 November 13, 2014 SSMEtypicalWorkoverOperationTimeline retrieve EDP/LRP disassembly retrieve risers retrieve SFT and TF finishing 27 hrs resume production deferred operation 62 hrs 48 move away from well actual workover operation 48 hrs retrieve coiled tubing/wireline run coiled tubing/wireline move above well ROV assisted connect hook up coiled tubing/wireline function and seal test hook up SFT and TF run risers run EDP/LRP assembly and test depth: 300m Typical Workover Operation Context zero order model tworkover = ttransportation + tpreparation+ tworkover+ tfinishing well 3 well 2 first order model well 1 tworkover = ttransportation + tpreparation+ tworkover+ tdisruption + tfinishing harbor disruption 5 10 days SubSea Modeling Example 8 Gerrit Muller version: 0.4 November 13, 2014 SSMEtypicalWorkoverOperationContext finishing 24 hrs continued workover reconnect storm workover preparation 32 hrs transportation 24 hrs actual workover operation 48 hrs workover well 2 finishing 24 hrs preparation 32 hrs transportation 24 hrs workover well 1 0-order Cost Model Workover Operation workover cost per day platform, rig equipment crew total assumed cost (MNoK) 2 0.2 0.1 2.3 MNoK/day deferred operation per day production delay ongoing cost operation total assumed cost (MNoK) 0.1 0.2 0.3 MNoK/day workover duration transportation preparation workover finishing total estimated duration (hours) production loss 24 6 36 48 48 8 27 135 (5.6 days) 62 (2.6 days) cost = costworkover/day * tworkover + costdeferred op./day * tdeferred op. ~= 2.3 * 5.6 + 0.3 * 2.6 ~= 14 MNoK / workover SubSea Modeling Example 9 Gerrit Muller version: 0.4 November 13, 2014 SSMEcostModelWorkoverOperation Disruption Workover Operation 7a rig 7 disruption, e.g. storm SFT shut down valves SFT WOCS vessel or platform vessel or platform retract wireline 7b TF TF 7 rig 7c TF WOCS rig TF SFT WOCS SFT vessel or platform riser riser rig WOCS vessel or platform riser riser control t&p well 7a EDP EDP LRP LRP LRP LRP move away XT well head XT well head XT well head XT well head well well well well open valves 7c run wireline move away control t&p well workover disruption reconnect EDP EDP continue workover move above well reconnect wait EDP move above well 7b wait for resolution of disruption perform workover operations disconnect EDP 7 24 SubSea Modeling Example 10 Gerrit Muller version: 0.4 November 13, 2014 SSMEdisruptionWorkoverOperation 48 hours ROV 1st order Cost Model Workover Operation workover cost per day platform, rig equipment crew total assumed cost (MNoK) 2 0.2 0.1 2.3 MNoK/day deferred operation per day production delay ongoing cost operation total assumed cost (MNoK) 0.1 0.2 0.3 MNoK/day 1st order cost workover duration workover 0-order average disruption duration overhead disruption frequency 1st order disruption correction total estimated duration (hours) production loss 135 (5.6 days) 62 (2.6 days) 72 11 0.3 83*0.3= 27 27 162 (6.7 days) 89 (3.7 days) = costworkover/day * tworkover + costdeferred op./day * tdeferred op. ~= 2.3 * 6.7 + 0.3 * 3.7 ~= 16.5 MNoK / workover 0-order cost ~= 14 MNoK ; disruption cost ~= 2.5 MNoK SubSea Modeling Example 11 Gerrit Muller version: 0.4 November 13, 2014 SSMEcostModelWorkoverOperation1stOrder A3 Architecture Overview This A3 based on the work of SEMA participants: Martin Moberga, Tormod Stranda, Vazgen Karlsenf, and Damien Weef, and the master project paper by Dag Jostein Kleverf. aAker Solutions, f FMC Technologies Workover operation; architecture overview workover workflow assembly, functional test workover workflow rig 1 EDP LRP vessel or platform 2 TF rig SFT WOCS vessel or platform 4 TF SFT vessel or platform EDP LRP WOCS SFT WOCS SFT XT well head XT well head XT well head XT well head well well well well well ROV ROV TF WOCS vessel or platform SFT rig 10 WOCS SFT 7a rig WOCS vessel or platform EDP LRP XT well head EDP LRP XT well head well well well ROV vessel or platform EDP LRP TF retract wireline vessel or platform 5 SFT shut down valves 7b rig WOCS SFT 7c rig WOCS SFT TF WOCS SFT vessel or platform XT well head XT well head XT well head well well well well disconnect EDP move away ROV Xmas tree provides well control run wireline 24 48 hours actual workover operation 48 hrs retrieve risers depth: 300m 11 retrieve EDP/LRP disassembly running and retrieving coiled tubing/wireline: 100m/hr retrieve SFT and TF running and retrieving risers: 50m/hr retrieve EDP/LRP preparation 36 hrs stop production finishing 27 hrs resume production deferred operation 62 hrs disassembly 24 SubSea Modeling Example 12 Gerrit Muller 48 72 remotely operated vehicle one for observation one for operation lower riser package provides well control function XT well head structural and pressurecontaining interface 0-order workover cost estimate workover cost per day 96 hours assumed cost (MNoK) workover duration estimated duration (hours) production loss platform, rig 2 transportation 24 equipment 0.2 preparation 36 6 crew 0.1 workover 48 48 total 2.3 MNoK/day finishing 27 8 deferred operation per day 12 work over control system monitoring and control of subsea installation well move away from well assumptions: retrieve coiled tubing/wireline workover timeline run coiled tubing/wireline move above well ROV assisted connect hook up coiled tubing/wireline function and seal test retrieve risers hook up SFT and TF 10 run risers retrieve SFT and TF assembly and test move away from well run EDP/LRP ROV assisted disconnect ROV EDP LRP open valves 8 9 WOCS ROV emergency disconnect package provides disconnect function 7c unhook coil tubing and wireline BOP SFT riser conduit for running tools to well continue workover reconnect move above well workover disruption reconnect EDP move away retrieve coil tubing and wireline BOP well wireline coil tubing BOP provides well control vessel or platform disruption timeline move above well control t&p well 7 well TF disruption workflow 7 perform workover operations LRP XT well head EDP LRP XT well head well well 7b wait run coil tubing and wireline EDP rig surface flow tree provides well control riser EDP LRP XT well head EDP LRP XT well head wait for resolution of disruption system function and connection seal test 7a EDP LRP XT well head tension frame connects riser to rig tension system WOCS vessel or platform riser riser TF SFT WOCS EDP LRP control t&p well 6 vessel or platform rig EDP LRP vessel or platform rig TF vessel or platform 12 TF SFT WOCS riser EDP LRP XT well head TF rig 11 TF SFT WOCS physical model 7 move above well hook up coil tubing and wireline BOP rig TF vessel or platform riser riser 9 rig 8 SFT WOCS vessel or platform EDP LRP XT well head rig TF TF vessel or platform EDP LRP disruption workflow 7 rig 6 TF vessel or platform EDP LRP 3 ROV assisted connect rig 5 riser 2 run risers rig TF SFT WOCS run EDP/LRP 4 rig 3 TF SFT WOCS 1 hook up SFT and TF version 2.2 Gerrit Muller assumed cost (MNoK) production delay 0.1 ongoing cost operation 0.2 total 0.3 MNoK/day total 135 (5.6 days) 62 (2.6 days) cost = costworkover/day * tworkover + costdeferred op./day * tdeferred op. ~= 2.3 * 5.6 + 0.3 * 2.6 ~= 14 MNoK / workover version: 0.4 November 13, 2014 SSMEoverviewA3
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