Evaluation of Intersect for polymer flood full field simulations - PowerPoint PPT Presentation

Evaluation of Intersect for polymer flood full field simulations Konstantin MONASTYREV Adolfo HENRIQUEZ Senior adviser Senior adviser Petoro AS Petoro AS Stavanger Norway Stavanger Norway

Presentation overview • Information about the oil field • Business case of early polymer injection • Reservoir simulation challenge • Setup of INTERSECT evaluation • Results of INTERSECT evaluation • Way forward • Q&A 2 INTERSECT evaluation – early polymer injection on Norwegian continental shelf

Polymer injection from day one • Polymer injection is new method for • Green field NCS • 2 main formations – • EOR – how to get optimum well – High perm upper and low perm lower pattern? – Most of STOIIP in upper formation • Costs of implementation are high • Permeability contrast – Need to have a strong business case – 10-15 fold – Implementation is time critical • Pressure support – Weak to non present aquifer – Undersaturated oil with low GOR • Unfavorable mobility ratio = 5 • Development concept – Mixed, platform plus subsea 3 INTERSECT evaluation – early polymer injection on Norwegian continental shelf

Targeting remaining oil in the field Water injection Polymer injection RF 4 INTERSECT evaluation – early polymer injection on Norwegian continental shelf

Detailed full field simulation is a key • Run times > 1 week for desired resolution • ECLIPSE Parallel or Multiple Realisation runs or LGRs won’t help! • Sector model or coarse model? • Risk of decision delay – Decision based on «simplified problem study» Elapsed model run time with different grid resolution 5 INTERSECT evaluation – early polymer injection on Norwegian continental shelf

New simulation technology for new oil field 6 INTERSECT evaluation – early polymer injection on Norwegian continental shelf

ECLIPSE and INTERSECT give similar results INTERSECT ECLIPSE Water flood simulation 7 INTERSECT evaluation – early polymer injection on Norwegian continental shelf

Addressing behavior difference Field oil production rate Field oil production rate INTERSECT ECLIPSE Reservoir pressure difference IX has E300 defaults IX with E100 switch (new feature*) 8 INTERSECT evaluation – early polymer injection on Norwegian continental shelf

Polymer injection in INTERSECT ECLIPSE INTERSECT Polynomial fit of the experimental data (FP5115 VHM) 16 14 12 10 viscosity(cp) 8 6 4 y = 4069,4x 3 - 716,54x 2 + 106,68x + 0,3964 2 R² = 0,9999 0 0 0,05 0,1 0,15 0,2 Polymer concentration(wt%) 9 INTERSECT evaluation – early polymer injection on Norwegian continental shelf

Agreement of results for polymer injection • Good agreement between Oil production rate ECLIPSE and INTERSECT • Different formulation for polymer adsorption in INTERSECT Polymer production rate – ECLIPSE vs rock mass – INTERSECT vs water mass • Good agreement for polymer adsorption using some tuning Polymer adsorption cummulative – Adequate results with different adsorption rates 10 INTERSECT evaluation – early polymer injection on Norwegian continental shelf

New technology saves run time • Coarse model with polymer: Polymer concentration in detailed FFM – 9h vs 15h serial – 0,5h vs 2h @ max parallel • Detailed model with polymer: – 6.1 M cells, 30x30m grid – 5.5h vs > 1 week @ max parallel • Effective handing of LGRs 11 INTERSECT evaluation – early polymer injection on Norwegian continental shelf

INTERSECT shows better scalability refined 5x5 sector model with polymer injection 12 INTERSECT evaluation – early polymer injection on Norwegian continental shelf

Great potential for business case optimisation Polymer concentration development in detailed and coarse gridded regions 13 INTERSECT evaluation – early polymer injection on Norwegian continental shelf

Way forward and recommendations • INTERSECT is mature reservoir INTERSECT parallel run domains modeling technology • Petoro is considering use of INTERSECT for future studies where speed and scalability of INTERSECT will be critical: – EOR studies – Geological scale simulation – Replacement of «reservoir coupling» model with full field grid • INTERSECT is not a «silver bullet» - it is tool for complex problems: – ECLIPSE is still a tool of choice for conventional models! 14 INTERSECT evaluation – early polymer injection on Norwegian continental shelf

Questions Valuable contributors to the project • Adolfo Henriquez (project owner – Petoro) • Hamid Nasiri (EOR expert – Petoro) • Taoufik Manai (Schlumberger) • Alexander Shadchnev (Schlumberger) • Alan Thompson (Schlumberger) 15 INTERSECT evaluation – early polymer injection on Norwegian continental shelf