In detailed design the station is prepared for operation

Transcription

1 Deep Water Boosting Design in an Operational Perspective Tine Bauck Irmann-Jacobsen TechnipFMC NH GRAND HOTEL KRASNAPOLSKY AMSTERDAM 3-5 APRIL 2017

2 The Multiphase Boosting Station operation in the system Topside or onshore Processing facilities Multiphase Pump Boosting Station Riser Trees & manifolds Pipeline Flow Mixer V-8, Minflow Near well reservoir LEU Wells V-5 MPP V-7, bypass V-6 In detailed design the station is prepared for operation

3 Dynamic Model of the Multiphase Boosting Station Preparation of operation in design phase is done by dynamic simulations of total system including the detailed boosting station. All disciplines are linked together, including limitations in power, pressures, temperatures, equipment operating envelopes, wells, valve handling, etc. Equipment Design Verification Start-up/Shut-down Dead-oil preservation Ramp-up/Turn-down Slugging Failure scenarios Establish process control and operational philosophy Identify operational risks that cannot be solved by design

4 From offline Engineering tool to online Operation supporting tool The dynamic model used during design can easily be converted to an online supporting tool, by linking tags to real sensors. During commissioning and first start-up, the Operation supporting tool can be benchmarked towards the real system, and operational philosophies verified. The Operation supporting tool for deep water boosting is ready for use. Look-a-head production/flow/process performance Verification of operational scenarios Operational point optimization Operability risk/challenge prediction and warning Disturbance caused by upstream/downstream system to the MPP Disturbance to upstream/downstream system caused by MPP

5 MultiPhasePump Performance Curves Example of operational support tool use MCE Deepwater Development 2017 MPP curve is changing with GasVolumeFraction (GVF) Suction Pressure Suction Temperature MPP Performance Curves 1500 rpm 2000 rpm 2500 rpm 3000 rpm For low GVF the pump performance approaches single phase For high GVF the pump approaches gas compression DP [bar] Total Rate Actual [m3/h]

6 MPP Performance during flow instabilities Example of operational support tool use If the operator is aware of a flow instability, as in this case, a gas pocket coming into the station, he can adjust the pump speed accordingly. MCE Deepwater Development 2017 GVF 40% 90% 60% 6

7 Insulation design of boosting station Example of operational support tool use From single component to system analysis MCE Deepwater Development /20/2017 FMC Technologies Confidential 7

8 Cool-down analysis and testing during design Example of operational support tool use Steady state temperature analysis Cool-down analysis

9 From offline Thermal design to online Operation supporting tool Example of operational support tool use The thermal design specifications are conservative, hence during operation the real cool-down time is most of the time much longer than designed. Merging the Thermal system model with the Online operation support tool have several potential added values: Increased no-touch/cool-down time during operation Reduced thermal insulation, (cut cost and weight) 9

10 Summary MCE Deepwater Development 2017 The offline dynamic model converted to an online supporting tool serve several purposes: During commissioning and first start-up, the Operation supporting tool is important to Understand how the real system is operating Benchmarking models towards the real system Verify operational philosophies DuringOperation the support tool for deep water boosting give valuable support and advice for the operators and flow assurance experts Merging the Thermal system model with the Online operation support tool have several potential added values: Increased no-touch/cool-down time during operation Reduced thermal insulation (cost and weight reduction) 10