Offshore Pipelines

Offshore PipelinesCapability & Experience

Capability OverviewINTECSEA is a leading engineering and projectdelivery company in the offshore oil and gassector. It operates across the full project cycleof diverse and technological developments. Itspriority is to provide high quality, value-addingsolutions for its customers.As an industry leader in offshore pipeline technology,INTECSEA assists operators worldwide with uniquesolutions to hydrocarbon production and transportationsystem needs.INTECSEA designs and manages offshore pipelineprojects, leading the industry in the execution of ultradeepwater marine pipeline projects.Industry leader in deepwaterpipeline technologyOur broad expertise enables complex projects in technicallychallenging environments to be managed in-house for fewerinterfaces and faster application of lessons learned.HPHT design, pipe-in-pipe design, full-scale testing programmanagement, dense phase flow assessment, piggingtechnology, ultra deepwater survey management and advancedmechanics are all examples of our leading edge capability.INTECSEA’s extensive project experience includespractical design and installation knowledge requiredfor cost effective completion and operation of marinepipeline facilities in all environments. In addition toindustry-leading deepwater pipeline applications,INTECSEA has also been responsible for many longdistance, large diameter transmission pipeline projectsand conventional offshore platform-to-platform pipelineprojects.Services Technical and feasibility studies Survey management and route selection andvisualization Preliminary and detailed design Field development engineering HP/HT pipeline engineering Arctic pipeline engineering Insulated pipe-in-pipe engineering Deepwater flowline and pipeline engineering Pipeline repair engineering Materials and NDT engineering Project and construction management Owner’s engineering Asset Integrity Management and operation support Flow assurance assessment

Engineering ServicesConventional Pipeline DesignPreliminary and/or detailed submarinepipeline design generally includes designbasis document, safety schematic,pipeline flow assurance and line sizing,pipeline route selection, geohazardanalysis, pipeline route alignmentdrawings, on-bottom stability analysisand determination of weight coating and/or trenching requirements. INTECSEAalso determines wall thickness and steelgrade using traditional or limit statedesign criteria and associated mechanicaldesign. Other services include; pipespanning analysis and determination ofpipe support requirements and design,risk study and definition of remedialmeasures as well as pipeline installationstudies to verify alternative installationoptions.Pipeline Shore Crossing DesignThe shore crossing design for a pipelinesystem is a combination of site selectionand design activities required to maintainpipeline stability and integrity whileminimizing impact to environmentallysensitive areas and adjacent propertyor facilities. Key activities includesite selection, design basis definition,pipeline stability analyses, operationalrequirements and construction methods.A thorough and rigorous degree ofengineering is often warranted in view ofthe potential for significant constructioncost reduction and operational reliabilityof the pipeline system. INTECSEA’stechnical expertise and involvement ina wide range of shore crossing designsprovide the basis for implementing acost-effective design.Long Distance and DeepwaterPipeline DesignThe design of long distance anddeepwater pipelines encompasses mostof the fundamentals of conventionalpipeline design. However, severaladditional aspects warrant a thoroughand rigorous level of engineering. Thedesign of long distance and deepwaterpipelines require particular attention toflow assurance to maintain deliverabilityand to prevent or mitigate the formationof hydrates, paraffin and/or asphaltenes.Furthermore, the system design effortmust consider the capabilities andrequirements for all parts of the systemthroughout the entire service life.Pipeline routing is a major factor thatcan directly influence the cost andfeasibility of a pipeline project. Designof large-diameter, deep water pipelinesrequires intimate knowledge of therelevant failure mechanisms, materialbehavior, pipe fabrication processesand installation limitations. INTECSEAcontinues to lead the industry to extendthe limits of pipeline design for deepwater through extensive full-scaletesting programs and close cooperationwith the code developers, pipe mills andconstruction contractors.Production Flowline DesignThere are several important issuesrelated specifically to (HT/HP) fielddevelopments. These include thermalexpansion, pipeline/flowline lateralor upheaval buckling, stress/strainlocalization, corrosion protectionsystems, flowline and componentmaterial selection and flow assurance. Asmany of these issues are interdependent,a clear understanding of the limitations,interaction and interdependency isrequired to develop a robust and reliablesystem design.INTECSEA’s experience andunderstanding of the issues andsolutions provides a cost effective, fit-forpurpose design. INTECSEA has extensiveexpertise in the design of flowlinesystems for HP/HT applications includingPipe-in-Pipe and Bundled Flowlines,Externally Insulated Flowlines andFlexible Pipe Flowlines.Pipeline Shore ApproachesINTECSEA has extensive experiencein the design and construction ofpipeline shore approaches. Our designapproach extends well beyond the basicmechanical design of the shore approachand includes geotechnical engineeringand marine geology aspects as well. Asa world leader in pipeline design andconstruction management, INTECSEA hashad the opportunity to showcase thisexperience on a number of challengingprojects for which shore approachstudies, design and/or construction wasa part.Shore Crossing ConstructionMethodsDifferent construction methods areevaluated to define the resultant trenchcross sections. Dredging (hydraulic andconventional), directional drilling, drillingand blasting, mechanical trenching,jetting and plowing techniques areconsidered in conjunction with seabedsoils data to determine methodsuitability. Shore crossing installationmethods and equipment, including pipepull, pipelay, horizontal directional drillingand/or a combination of these methods,may be evaluated. Pipe weight, stiffness,pulling requirements, bathymetry andshore crossing length are considered foreach installation method. In addition,selection of the optimum constructionmethods and, the availability of therequired construction equipment mustalso be considered. In some cases thepreferred method may not be costeffective due to lack of availability and/or high mobilization costs. Vessel draftlimitations in the shore approach mayalso limit the type of trenching/dredgingand pipeline construction equipmentwhich can be used.

Project ExperienceMica FlowlineCUSTOMER ExxonMobilAlgeria to Spain Gas Pipeline BP Angola Block 31, PSVMDevelopmentCUSTOMER MEDGAZLOCATION Gulf of Mexico, USALOCATION Mediterranean SeaCUSTOMER HMCSouth StreamCUSTOMER GazpromGuanabara Bay PE-3PipelineCUSTOMER BG TunisiaLOCATION Black Sea, RussiaCUSTOMER PetrobrasLOCATION Offshore TunisiaLOCATION Offshore AngolaThe Mica Field is located inMississippi Canyon Block211 in the Gulf of Mexico,approximately 100 milessouth of Mobile Bay, Alabamain water depth of 4,350 ft.Two 28 mile long productionflowlines (an 8-inch x 12-inchpipe-in-pipe insulated flowlineand an 8-inch uninsulatedflowline) will transporthydrocarbons from a subseamanifold to the BP Pompanoplatform in Viosca Knoll Block989. The Pompano platformis located in a water depth of1,300 ft. The two flowlinesterminate at the top of asingle existing J-tube on thePompano platform, and arelinked via a pigging loop atthe subsea manifold to enableround trip pigging operations.The MEDGAZ project comprises200 km (124 miles) of dual24-inch high-pressure ultradeepwater gas pipelines,designed to deliver as muchas 16 billion m3/year ofAlgerian natural gas under theMediterranean Sea to Spainand other European marketsfrom Beni Saf, Algeria, to alandfall at Playa del Charco,near Almeria, Spain.The lines included shoreapproaches and short onshorepipeline sections connectingonshore terminals at each endof the pipelines. The pipelinestraverse a maximum waterdepth of 2,160 m (7,087 ft).INTECSEA performed theFEED for this project, which iscurrently one of the deepestoperating gas pipelinesystems.The PSVM project for HMCinvolved comprehensivedesign engineering services,from tender support throughto detailed design andconstruction support. Inaddition to detailed designof multiple HTHP pipe-inpipe production flowlines, 24substantial subsea structuresand 30 complex deepwaterspools, INTECSEA alsoseconded Package Engineersto oversee delivery of criticalriser and flowline elements.The subsea developmentfeatures 48 subsea treesin 2000m water depth,connected through 13manifolds, 100 miles of carbonsteel flowlines, and 9 hybridrisers to a turret-moored FPSO.Hasdrubal PipelinesLOCATION Guanabara Bay, BrazilSouth Stream will compriseof four pipelines betweenthe Russian coast at Anapaand a landfall in Bulgaria.Each pipeline will be 32-inchdiameter and approximately900km in length. With waterdepths along the route of upto 2200m, this represents afurther extension of industrycapability. INTECSEA scopefor South Stream startedwith a feasibility study andcontinued into an extensivefullscale materials testing andmanufacturer qualificationprogram. INTECSEA has alsosupervised the detailed marinesurveys performed alongthe pipeline route and at thelandfalls. INTECSEA completedFEED for South Stream in2013 and continues to providetechnical support to theproject.PETROBRAS plans to installa new 18-inch diameterHeavy Fuel Oil (HFO) pipeline,designated PE-3, to replacethe existing 16-inch diameterPE-2 (HFO) pipeline. Theoverall PETROBRAS objectivefor the PE-3 pipeline wasto design a world-classpipeline system to transportrefinery products from thefacility at REDUC to loadingpiers. Protection of sensitiveenvironmental resources,safety, and protection of thepublic property were of utmostimportance and primary goalof the design.The Hasdrubal Field is locatedin Tunisian offshore watersapproximately 100km fromthe coast, in the Gulf of Gabes.The Hasdrubal developmentconsists of an unattendedwellhead platform in around60m of water. Due to the highproduct temperature (140c),the riser and first 10km ofthe pipeline is CRA lined toprevent corrosion. In order toaid temperature loss in thesystem, the riser has beenexternally coated using TSA.Midline expansion spools havebeen included in the first10km in order to mitigate therisk of lateral buckling. Thissection is also susceptibleto pipeline walking, whichhas been mitigated againstthrough the use of spoolconcrete protection covers,which also act as anchors.

Wellhead to MarketAnywhere in the Worldwww.intecsea.com

conventional), directional drilling, drilling and blasting, mechanical trenching, jetting and plowing techniques are considered in conjunction with seabed soils data to determine method suitability. Shore crossing installation methods and equipment, including pipe pull, pipelay, horizontal directional drilling and/or a combination of these methods,