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Distributed-parameter modelling in petroleum extraction Towards on-line applications David Cameron Fantoft Process Technologies.

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Presentation on theme: "Distributed-parameter modelling in petroleum extraction Towards on-line applications David Cameron Fantoft Process Technologies."— Presentation transcript:

1 Distributed-parameter modelling in petroleum extraction Towards on-line applications David Cameron Fantoft Process Technologies

2 © 2000 Fantoft Prosess as Disposition Corporate background. Distributed-parameter modelling. Single-phase and multiphase pipeline modelling. On-line applications of pipeline models. Technical challenges.

3 © 2000 Fantoft Prosess as Fantoft Process Technologies Offices in Oslo, Southhampton, Houston and St John’s. Supplier of: Process studies. Simulator systems. Real-time systems.

4 © 2000 Fantoft Prosess as Distributed-parameter modelling We’ve been doing it for years: Without knowing it? Standard models in dynamic simulators: Pipe. Heat exchanger. Separator. Discretisation has sometimes been a bit coarse! New challenges from process intensification and sub-sea operations.

5 © 2000 Fantoft Prosess as Compact heat exchanger Example of a relevant unit operation for off-shore operations. Complicated flow geometries. Every case is different. Want to be able to build a geometry from elementary heat transfer ”lego blocks”.

6 © 2000 Fantoft Prosess as Down-pipe separator. Existing technology: Big tanks, low-shear separation. Use a lumped model with three homogeneous lumps – gas, oil and water. New technology: High-shear separation. Need to model shear field to predictively model process.

7 © 2000 Fantoft Prosess as Single-phase and multiphase pipeline modelling. Well-established off-line technology: OLGA is a well-known, widely used tool. D-PIPE: single-phase pipeline. Conservation of mass, momentum and energy Transient, one-dimensional form.

8 © 2000 Fantoft Prosess as D-PIPE and D-SPICE D-SPICE Dynamic process simulator. D-PIPE Single-phase dynamic pipeline model within D-SPICE. D-SPICE is also interfaced with OLGA to provide multiphase capabilities.

9 © 2000 Fantoft Prosess as D-PIPE

10 © 2000 Fantoft Prosess as On-line applications of pipeline models Leak detection. Leak location. Look-ahead and planning. Instrument monitoring. Line-pack optimisation. Compressor optimisation. Batch and scraper tracking.

11 © 2000 Fantoft Prosess as An on-line pipeline system System functionality: Leak Detection Leak Location Leak Size Calculation Hydrate Formation Detection Pig Tracking Batch Tracking Inventory Control (gas packing, liquid condensing) Model functionality: Real Time Calculation and Monitoring including data validation Fast look ahead Planning Optimisation Model tuning Model: Single phase pipelines: – liquid – gas Multi phase pipelines: – 2 phase – 3 phase Pipe network

12 © 2000 Fantoft Prosess as Scraper tracking

13 © 2000 Fantoft Prosess as Technical challenges (1) Computational burden. Real-time. Inner loop in optimisation. Stability within network solver. Hierarchical solution algorithms. Development effort. Generation of gradient information for solvers and optimisers.

14 © 2000 Fantoft Prosess as Technical challenges (2) Statistical treatment of residuals: Differentiation of different types of error: Model error. Sensor error. Leakage. The key: spatial and time correlation of residuals.


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