e-petroleumservices.com 1 Business Benefits Delivered through True Valve Performance Yvonne Roberts Edinburgh Petroleum Services

e-petroleumservices.com 2 Introduction True Valve Performance Well Modelling i-AM Total System Optimisation $$

e-petroleumservices.com 3 intelligent Asset Management intelligent Asset Management is maximising the value that an oil or gas field delivers over its life from discovery to abandonment. –Initial investment (optimise strategy for production) –Daily Operations (optimise investments already made) –Planning (optimise timing and amount of future investments) For any producing asset, the first element is complete and the major emphasis is on intelligent Operation and Planning.

e-petroleumservices.com 4 True Valve Performance (TVP) Q Q THP IPR TVP P down Q gi Thornhill-Craver/orifice Gas-charged valve Valve Data custom-measured by Valve Performance Clearinghouse Measured data, not generic correlations Data specific to valve type and port size Accuracy!

e-petroleumservices.com 5 Data Flow On-line integration with SCADA systems Off-line activities Well Models with TVP Well Model Tuning Gas-Lift Diagnosis Gas-Lift and Total System Optimisation Steady-state Tuning and Analysis Dynamic Gas-Lift Analysis

e-petroleumservices.com 6 Total System Optimisation Fuel, Q gc Formation Gas, Q gf Produced Gas = Q gf +Q gi Other uses = Q gf -Q gc Lift Gas, Q gi Oil + Water +$-$ +$ Compressors Qsuction Pdisch Stonewall Surge Gas-lifted Wells (Curves for one THP) CHP Qoil Gas Injection Rate TVP provides the link

e-petroleumservices.com 7 Valve Stability Valve performance curve for a given CHP P Q gi Amount of gas injected by that valve at the given Casing and Tubing pressures Limit of valve stability Unstable operating point Tubing Performance for a given THP Increasing CHP (and P Minimum stable gas injection rate

e-petroleumservices.com 8 ReO Optimisation Flow Group Produced Fluids from Production Manifold Gas Injection Manifold (Pm1, Tm1) Flow Group 2 Wells To other Flow Groups Gas Injection Manifold (Pm2, Tm2) Flow Group 3 Wells To other Flow Groups Multiphase Optimisation

e-petroleumservices.com 9 On-line Diagnosis (Sedilag) Read SCADA Surface Production Data Check Gas Supply Status Check Production Status Check complete pressure drop from CHP to THP using valve models Advise operator and recommend remedial action if necessary Calculate deepest possible point of injection Pressure Depth P Cas P Tub Mandrel 1 Mandrel 2 Mandrel 3 Mandrel 4 Check which valve(s) open and the opening margin(s)

e-petroleumservices.com 10 Dynalift Inflow Q gi (t)

e-petroleumservices.com 11 Benefits through Optimisation Venezuela/Maracaibo –automated optimisation and GL-diagnosis 250 wells leading to gains worth around $36 Million/annum Kuwait –automated optimisation and performance analysis >400 wells with projected impact of $ Million/annum Norway/Ekofisk –impact assessment of Ekofisk II/integration with SCADA sustain increased production worth ~ $180 Million/annum North Sea –analysis and optimisation of single well performance prevention of over-intervention yielded production increase of ~ $1000/d.

e-petroleumservices.com 12 Business Benefits Delivered through True Valve Performance Yvonne Roberts Edinburgh Petroleum Services