Flow Assurance Assignment Design Engineering Essay

Flow Assurance subsidization frame Engineering EssayINTRODUCTIONThis report describes ab divulge the foundation of sub ocean draw offage that transfers condensate from satellite platform to touch platform. Designing of subsea strain and compiling this report exclusive design programme called Pipesim from Schlumberger is utilise. This programme used for designing and analyses for oil and gas production. And also analytic thinking meld line and surface facility performance to produce complete production trunk abstract.OBJECTIVESAvoid the geological make-up of hydrateScreen the pipeline for severe riser pipe pipe sackging to avoid its occurrence surface a keep ones shoulder to the wheel backstop perfect the insularity of the pipelinesCarry out an corrosion and wearing away analysis deliver engineering dataPIPELINE EXPLANTIONThe pipeline begins from satellite platform. From that platform it goes big money to 400 feet into sea bed. whence pipeline laid for 6.8 miles on the sea floor. Pipeline is connected to riser and taking upto platform surface.Here that entrust be connected to water seperator and multiphase centre. The water seperator has to be 90 % competency and about multiphase pump there has three natural selections of 50, 100, and 200 HP with efficiency of 80 %. After multiphase pump comes down with riser about 400 feet and connected to pipeline.This horizontal pipieline laid for 5 miles.End lay of this pipeline connected to riser and taken upto platform. From that platfrom, pipeline travels over the sea to bear upon platform for 8 miles.Every technical datas ar provided in appurtenance 2. Schematic sketch of pipeline is given below from PipesimPipeline DesignSelection of Internal Diameter of PipelineIn this project, we involve choice of pipeline ID coat 8, 10 and 12.Condensate should take a crap to reach in processing platform terminal with minimum compact of 1000 psia. By doing analysis with three unlike IDs only a combined pipe coat of 10 and 12 achieved minimum draw at processing platform. For 11,000 stb/d and 6000 stb/d, minimum reaching pressure is 1425 psia and 1,109 psia respectively got from graph. For multiphase pump decided to choose 50 HP. After selection of pump and pipeline size, these have to be checked in pressure temperature profile analysis for ensuring reach pressure at processing platform in a higher place 1,000 psia ( Shown in addition 1).Pipeline InsulationMinimum arrival temperature of condensate is 750F at processing platform. For attaining this comfort, the pipeline has to be insulted due to heat transfer loss. For finding out how much insularity have to use in pipeline through with(p) through by utilize pressure temperature analysis. For this insulation analysis is started with heaviness of 0.25 and if its not satisfied, hence we have to increment 0.25 continuously. Thickness selection provide be done through by clicking in pipeline and innovate value in heat trans fer tab. There we scum bag demean pipe conductivity, ambient temperature and burial depth. After entering all these values we will get an insulation thickness of 6 and minimum arrival temperature as 81.50F. These arrival temperature satisfys both processing platform temperature and formation of hydrate ( Shown in appendix 1, figure 4).Formation of HydrateHydrates argon form at high pressure and low temperature with combination of water and gas. unremarkably hydrates are formed inside subsea pipelines like plug formation. This can ca-ca major issues in oil and gas industry and resultant will be damaging of pipelines as well as processing facility. To clog hydrates, inhibitors are used in pipelines. Widely used inhibitor is methanol. Hydrate formation condition provided in notes as followsTemperature Temperature 1500 psiaAfter taking amount of insulation in account for getting an arrival temperature higher up 750F is satisfied from above results. And keeping temperature and pre ssure in limited figures can control formation of hydrates in pipeline. From graph values (Shown in appendix 1, figure 4) above conditions are satisfiedLiquid immix rate corresponding pressure and temperature 6,000 stb/d 1425 psia 81.5 0F respectively.Liquid flow rate corresponding pressure and temperature 11,000 stb/d 1109 psia 100 0F respectively.Screening for severe riser punchergingNumber of factors is caused due to peg away formation in riser. Some of them are given below.1. When Pipeline fostering is slightly downward before riser connection2. If fluid flow pattern is segregatedBy using PI-SS reduce riser slugging can be determined. Riser slugging can be conformed when take is less than 1.Then slug backstop have to be intentional by using pipesim. PI-SS number can be cypher through report from pipesim. By using this simulation package can be generate two reports. surface file can be obtained from report file and flow map. Then re-run model and from that out file ob tained. Low PI-SS numbers are highlighted in out file. Riser slugging happens in flow line 1. This shows that slug catcher have to be design.Design of Slug CatcherThe slug catcher size is determined based on following three criteria. They areThe essential to hold the major slug in future sine qua non for handling liquid comes out from pigRequired for store the slug where production rate is increase to 6000 to 11000 stb/dFollowing values are calculated from design. The output file is shown in Appendix and biggest one in one thousand slug size is originated. In this report it is calculated to 2211.168 feet. From the value we have got slug volume 2892.93 ft3.For second value taken from the liquid cleaned in front of a pig can be checked. It is clear that the minimum flow gives larger volume about 1801.512 cask or 10114.73 ft3. Now calculated is liquid delayed when flow is increased 6000 to 11000 stb/d. This is dissimilarity in meat delay between the two flow rates. That means 3201.99 bbl 2459 bbl = 742.25 bbl = 4164.0225 ft3.Therefore the pigging volume is 10114.73 ft3 (Appendix 1, foretell 6,7,8).Corrosion and erosion analysisCorrosion and erosion are primary(prenominal) concern in pipelines and this have to be kept very low. When erosion occurs, it reduces pipeline diameter. This has to be replaced before when it reaches to minimum value. Corrosion is occurred due to some reasons. This is major problem in oil and gas industry. The erosion analysis is done through following steps. Software analysis is done and the secret plan is got from erosion velocity ratio in Y axis and total outgo from X axis. From graph flow is not exceeding value one which shows that there will be no erosion occurring in pipeline. ( Appendix 1, ascertain 2)Engineering DataFlowline 1Flowline 2Flowline3Size of Pipeline ( Inches)101010Insulation Thickness666Riser size 10 inchesMultiphase pump 50 HPSlugging YesSize of Slug Catcher 10114.73 ft3Erosion or Corrosion NoConclusionPipesim i s tool used for designing pipeline and for getting exact performance in system. In this project, for flowline 1 and flowline 2 are used 10 inch pipeline size. For flowline 3, pipeline size is 12 inch. After considering flowlines sizes we will achieve minimum arrival pressure and temperature at processing platform. Formation of hydrate was eliminated by proper insulation and multiphase pump power. Slugging is found in simulation for that reason we have provided slug catcher. Analyzing erosion and corrosion proved that there will be no erosion in pipeline. Generally project is successfully designed according to requirement.REFERENCEPipesim HelpClass notes from Dr Shuisheng. Hehttp//www.easycalculation.com/unit-conversion/volume-unit-converter.phphttp//www.slb.com/services/software/production_software/prod_analysis_diagnostics/pipesim.aspxE.D.Sloan, Clathrate Hydrates of Natural Gashttp//en.wikipedia.org/wiki/HydrateAPPENDIX 1 ascertain 1 Pressure TemperatureFigure 2 Erosional veloci ty ratio- Total lengthFigure3 Pressure Vs Total distanceFigure 4 Temperature Vs Total distanceFigure 5 Pressure Vs Total distance ( without flow rate)Figure 6 PI-SS NumberFigure 7 Largest 1/1000 slug lengthFigure 8 Liquid by sphere number