TURBO GAS LIFT Innovative Hybrid Artificial Lift Method GÁS-LIFT COM TURBINA O MODO INOVANTE HÍBRIDO DE ELEVAÇÃO DE PETRÓLEO

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1 TGL Republic of Croatia Ministry of Science and Technology OILFIELD EQUIPMENT AND SERVICES Ltd TURBO GAS LIFT Innovative Hybrid Artificial Lift Method GÁS-LIFT COM TURBINA O MODO INOVANTE HÍBRIDO DE ELEVAÇÃO DE PETRÓLEO Presenter: Kresimir Keglevic kresimir.keglevic@zg.htnet.hr

2 TURBO GAS LIFT-COMPETION tubing φ 6,3 mm GAS LIFT VALVE GAS LIFT VALVE tubing φ 76,2 mm A A GAS TURBINE +PUMP PACKER BOTTOM

3 BASIC OPERATION PRINCIPLES OF TURBO GAS LIFT METHOD ARTIFICAL LIFT METHOD COMBINED BY PUMP AND GASLIFT PUMP IS DRIVEN BY GAS TURBINE SUPPLIED BY COMPRESSED GAS FROM SURFACE THE SAME GAS IS USED FOR LIFTING BY GAS LIFT AFTERWARDS, GAS IS DOING TWO WORKS PUMPING UNIT CAN BE ANY ROTATING PUMP SUCH AS CENTRIFUGAL, OR OTHER ROTATING PUMP CAN BE APPLIED AS CONTINIOUS AND INTERMITTENT REDUCES OPERATING EXPENSES AS WELL AS CAPITAL EXPENSES SIMPLE TECHNIQUE, EASY TO APPLY ON EXISTING GAS LIFT WELLS

4 TURBO GAS LIFT-OPERATION PRINCIPLES VALVE tubing φ 6,3 mm VALVE tubing φ 76,2 mm A A GAS TURBINE+PUMP PACKER BOTTOM

5 GAS LIFT DESIGN Gs Fmax tubing gradient L3 L4 L5 L6 LA LB Fmin L1 L2 Pu P valve closing Pgas injection pressure (bar) temp. ( C) temperature gradient GLR 6 m 3 /m 3 GLR 12 m 3 /m 3 Pd Ps GLR 2 m 3 /m 3 depth (m)

6 gaslift valve surface closing pressure=49 bar gas injection pressure surface gaslift system pressure=61bar turbo lift A3 A1 A A2 B3 B1 B B2 GLR=9 minimal difference between gaslift valve surface closing pressure and gas injection pressure =7.5 bar (distance A-B,A1-B1i A2-B2) P static 1=16 bar P static beggining=23 bar GLR=3 GLR=2 GLR=1

7 Pressure surplus utilisation Utilisation existing pressure surplus through turbine instead losing its working capability through a choke Lower achievable flowing bottomhole pressure due to application of turbo lift Brings an increase in production rate or lower abandonment pressure

8 2 4 Surface system pressure 1 bar Gaslift valve surface closing pressure Gaslift system Gas injection pressure pressure Qfluid=f(Pe-Pwf) 6 8 GLR=1 pressure drop through valve 7,5 bars Depth (m) P static beginning=23 bars gradient=1bar/1 meters bar-dynamic pressure INJECTION DEPTH

9 Surface system pressure 1 bar Gaslift valve surface closing pressure Gaslift system Gas injection pressure pressure A B 8 GLR=3 GLR=1 pressure surplus Qfluid=f(Pe-Pwf) Depth (m) P static beginning=23 bar bar-dynamic pressure bar-dynamic pressure 1 P static 1=195 bar A 1 B 1

10 Combined system regulation Easily adjustable Turbine power depends of gas flow rate and turbine s intake-discharge pressure difference Turbine power and subsequently pump head is easily regulated by working gas lift valve Can easily turn into intermittent mode

11 CENTRIFUGAL PUMP+GAS LIFT gradients Pwellhead pressure (bar) PUMP pressure gradientwithout gas re-injection temp. ( C) PUMP pressure gradient with Gas re-injection temperature gradijent depth (m) Point of gas re injection PUMP INSTALATION DEPTH Pi3 '" Pi2 P3 Pi1 P2 P1 Pizlaza Pd '" Pd " Pd' Ps Reservoir pressure decline

12 TURBO GAS LIFT-INTERMITTENT COMPLETION AND OPERATION tubing φ 6,3 mm GAS LIFT VALVE tubing φ 76,2 mm GAS LIFT VALVE A A GAS TURBINE PACKER BOTTOM

13 P P din P din min DYNAMIC PRESSURE vs. TIME AT TWO METHODS gaslift valve opening moment INTERMITTENT GAS LIFT t P t1 t2 gaslift valve opening moment INTERMITTENT TURBO GAS LIFT P din min t t1 t2

14 Q FLUID AFFLUX vs TIME AT TWO METHODS fluid afflux into wellbore INTERMITTENT GAS LIFT t1 t2 t Q fluid afflux into wellbore INTERMITTENT TURBO GAS LIFT t1 t2 t

15 MICROTUBINE for laboratory testing

16 TURBO GAS LIFT R&D- CHALLANGES Must be simple, robust, durable Smallest possible number of moving parts Direct connection turbine-pump, avoiding gear box Turbine should be relative low RPM Pump must be capable to work and maintain high efficiency at relative high RPM Pump must be capable to handle free gas, solids

17 CF PUMP-LAB TESTING

18 CF PUMP-LAB TESTING

19 Q-H curves at different RPM H [m] /min 1 H [m] 1 Eta [%] H [m] 6 1/min Q [L/min] Q [L/min] H [m] Eta [%] H [m] /min H [m] Eta [%] Q [L/min] 5

20 Q-H curves at different RPM 6 8 1/min H [m] Eta [%] H [m] Q [L/min] /min H [m] Eta [%] 5 5 H [m] Q [L/min]

21 Key benefits of Turbo Gas Lift Increased volumetric efficiency-higher liquid volumes Superior reservoir drawdown-increased production rate Decreased gas injection requirements Prolonged continuous gas lift Decreased abandonment pressure

22 TGL OILFIED EQUIPMENT AND SERVICES Ltd THANK YOU FOR ATTENTION Contacts: Kresimir Keglevic Tomislav Nizetic