Real-Time Gas Lift Optimization 2001 ASME/API Gas Lift Workshop - Aberdeen Tommy White Artificial Lift Business Development Mgr.

Content Gas Lift Optimization – Focused on Service Delivery Field trial of a new method – real time optimization The added value New solutions Conclusions 2 TMW

Virtuous Circle Diagnosis Implementation Analysis Validation Artificial lift engineering Data acquisition Diagnosis Implementation Analysis Validation Data acquisition and comparison Artificial lift products and services

Gas Lift Service A service that optimizes gas lifted wells using multiphase flow-metering technology This service encompasses artificial lift engineering expertise multiphase well testing equipment and expertise – (real time production measurement) implementation products and services artificial lift products and services. 4 TMW

Multiphase Metering Benefits leading to Production Optimization Real time data Extensive data base in short period of time Quick turn around time for decision making Resolution Accuracy Dynamic response Accurate data and independent of flow regime 5 TMW

Gas Lift Service Field Trial Well application in Venezuela 6 TMW

Gas Lift Service Slickline unit performing flowing gradient survey 7 TMW

Gas Lift Service Portable three-phase tester tied to a gas lift well production line 8 TMW

Gas Lift Service Control bay interprets real time data 9 TMW

Gas Lift Analysis Inside control bay during multi-rate test on 800 Total fluid Total gas 700 600 500 Oil and water rate (BOPD) 400 300 200 Inside control bay during multi-rate test on gas lift well 100 0 3 6 9 12 15 Time (hr) Gas and total fluid result 10 TMW

Oil and water rate (BOPD) Gas Lift Analysis 800 Total oil Total water 700 600 500 Oil and water rate (BOPD) 400 300 200 Inside control bay during multi-rate test on gas lift well 100 0 3 6 9 12 15 Time (hr) Oil and water result 11 TMW

Flowing gradient survey result Gas Lift Analysis 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000 TVD (ft) Flowing gradient survey provides real valve injection points Stable flow measured by PhaseTester 50 75 100 125 150 175 200 225 250 Temperature (º F) Flowing gradient survey result 12 TMW

Gas Lift Diagnosis Operating rate (STB/D) Inside artificial lift engineering office during diagnosis 0.3 0.375 0.45 0.525 0.6 Lift gas injection rate (MMscf/D) Lift gas performance curves 13 TMW

Existing gas injection location Gas Lift Diagnosis 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000 TVD (ft) Inside artificial lift engineering office during diagnosis 50 75 100 125 150 175 200 225 250 Temperature (º F) Existing gas injection location 14 TMW

NODAL* production system model match to real well data Gas Lift Diagnosis 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000 TVD (ft) Inside artificial lift engineering office during diagnosis 50 75 100 125 150 175 200 225 250 Temperature (º F) NODAL* production system model match to real well data 15 TMW

Gas Lift Diagnosis Artificial lift equipment selection Venturi gas lift orifice valve minimizes injected gas increases well stability by injecting subcritical gas into tubing optimizes use of limited gas supplies maintains the deepest point of injection. 16 TMW

Modeled location of Venturi gas lift valve Gas Lift Diagnosis 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000 TVD (ft) Inside artificial lift engineering office during diagnosis 50 75 100 125 150 175 200 225 250 Temperature (º F) Modeled location of Venturi gas lift valve 17 TMW

Gas Lift Implementation Slickline installation of the Venturi gas lift valve in the deepest mandrel 18 TMW

Gradient survey validates predictions Gas Lift Validation 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000 TVD (ft) Inside artificial lift engineering office during validation 50 75 100 125 150 175 200 225 250 Temperature (º F) Gradient survey validates predictions 19 TMW

Real-time data acquisition validates production increase and stability Gas Lift Validation 800 After Injected Gas Rate 0.675 MMSCF/d Before Injected Gas Rate 0.715 MMSCF/d 700 600 500 Oil and water rate (BOPD) 400 300 200 Inside artificial lift engineering office during validation 100 0 1 2 3 Time (hr) Real-time data acquisition validates production increase and stability 20 TMW

Added Value Actual gas lift well application results: 16% increase in production 6% decrease in injected gas cost of operation recovered in 20 days Maximizing productivity through: technology people process. Field example of Artificial Lift operation 21 TMW

Gas Lift System Optimization Well Focus GL Design Gas Lift Design Performance Well Focus Gas Injection SEPERATOR Well Focus 3-Phase Flow 3-Phase Measurement And Stability Monitor Well Focus Gas Lift System Optimization SEPERATOR The existing set-up optimizes the gas injection on surface. This is not any use if the downhole system and reservoir aren’t being considered. Therefore the need for a closed-loop analysis is needed that encompasses this. The 3-Phase measurement gives a solid reading on what gains you are actually producing through implementing a change in the system set-up 22 TMW

Real Time Optimization Benefits Real gains can be seen very quickly through placing a focus on lift optimization use of real time data acquisition which minimizes the cycle time for optimum data analysis and solution applications application of accepted technology Extending product knowledge to add value identify the right path to take the solution further implementing a path of long term lift optimization 23 TMW

The Future of Gas Lift 24 TMW

The Optimization Process Monitoring Field Actuate and Control InterACT Instructions SCADA Transmission Data Manipulation and Storage Office Decision Making Software Tools 25 TMW

Automated AL - The Future