Water Management Experience in Mature Basin in South Argentina Case Study of Golfo San Jorge Basin

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1 Water Management Experience in Mature Basin in South Argentina Case Study of Golfo San Jorge Basin Eng. Clemente Marcelo Hirschfeldt OilProduction Oil & Gas Consulting Patagonia Argentina BIT`s 3rd Annual World Congress of Well Stimularion and EOR April Xian. China

2 Overview o Argentina Introduction to the regional Context o Golfo San Jorge Basin (GSJB) o Water Management in GSJB o Water treatment and distribution o Water flooding projects o Water Management Cost o Well integrity management o Conclusions

3 Argentina Introduction to the regional Context

4 Argentina and regional context Venezuela Total South America Oil production Colombia Guyanas 6,923,789 bopd Ecuador Peru Peru Bolivia Brazil 592,846 bpd 8.6 % Paraguay Chile Argentina Uruguay Source: Journal of Petroleum Engineering (JPT) November 2011

5 Argentina - Oil & Gas Statistics North-West 5 Productive Basins Oil 592,496 bpd 2,320 miles / 3,734 km Cuyana Neuquina Golfo San Jorge Gas Active Wells: 24, Bcfpd Water 5.69 MM bpd Water % 90 % Source: Energy Secretary of Argentina. November 2011 Austral

6 Argentina Production evolution Water: 5,694,945 bpd Oil: 592,496 bpd

7 Golfo San Jorge Basin (GSJB) 105 years of history

8 Introduction to Golfo San Jorge Basin Peru 28 MM acre Located in Patagonia Argentina First oil well was drilled in Comodoro Rivadavia city in 1907

9 Introduction to Golfo San Jorge Basin Oil Gas 28,000 M acre 278,865 bpd 0.51 Bcfpd Water 2.94 MM bpd Water % 90 % Active Wells: 13,163 Water Injector wells: 2,718 Source: Energy Secretary of Argentina. November 2011

10 GSJB Main Characteristics Faults and sand stone lenses HWOR (high water-oil ratio) Increasing fluid flow rate per well Reservoirs from 2,000 to 9000 feet up to 35 different reservoirs opened Vertical wells (5 ½ casing) Semi-desert environment

11 GSJB - Enviroment and Landscape

12 GSJB Production evolution ,000 Water - Millons of bpd Water Oil 450, , , , ,000 Oil - bpd , ,000

13 Water Management in GSJB Objetives and Challenges

14 Objetives of Water Management in GSJB Water handling cost Environment Impact Increase oil production Increase Reserves Increasing Asset Value Improving the Water Management Process

15 Water System Scheme 13,163 wells (13,023 with ALS) GAS OIL Treatment and injection plants Water pipelines 2,718 injectors wells aquifer disposal up to 35 different reservoirs opened Selective injection (waterflooding projects) From 3000 to 9000 ft

16 Activities related to water management GAS OIL Water Treatment Power supplay Surface Distribution aquifer Well Integrity Management disposal Production Optimization Downhole Distribution Reservoir Management

17 The Water System and activities related

18 Water treatment and distribution

19 Water Treatment not complex process in GSJB 75 process and pumping plants Tipical Treatment Suspended Solids and Oil Removal Dissolved Oxygen removal Scale prevention Bacteria Control Corrosion Control

20 Surface distribution 2.94 Millons of bpd of water injected 2,718 injectors wells Close to 170 injection manifold Individual Electromagnetic Flowmeters Scada sistems for surveillance

21 Downhole distribution Selective Injection Up to 15 mandrels Wireline operation is requiered for moving valves and measuring the individual water flow rate Surveillance on injection patterns with tracers

22 Waterflooding projects in GSJB the key for water management

23 GSJB - Water Injection vs Oil production 117,006 bopd 100 % of water produced is injected for Secundary Recovery Projects Close to 250 Waterflooding Projects in GSJB

24 Oil production from Secundary Recovery Projects December 2011 Recovery Factor Primary: 9-15 % Recovery Factor Secundary: 5-10%

25 Oil production from Secundary Recovery Projects

26 % of water produced

27 Water balance Bottlenecks Analysis

28 Water balance & Bottlenecks Analysis When the limit of water handling is reached, we can consider at least two options Oil production & Water sources Water injection Primary Production Secundary rec. Production water supply wells Treatment and transportation Disposal Water flooding Reduce water production Increase the water injection capacity technical and economic analysis is requiered in both cases

29 Water balance & Bottlenecks Analysis Restrictions that could affect the Water Injection Oil production & Water sources Water injection Primary Production Secundary rec. Production water supply wells Treatment and transportation Disposal Water flooding Low injectivity at the reservoir Treatment and distribution capacity limited Enviromental problems Economic limit

30 Water balance & Bottlenecks Analysis Oil production & Water sources Possible Actions Water injection Production primary Production Secundary Rec water supply wells Treatment and transportation Disposal Water flooding Water shut-off (a few porjects in GSJB) Insolate water zone (some time oil production is insolated too) Downhole Oil And Water Separator ( not used in GSJB) Shut-in producers wells (the last decision) Injector Wells stimulation (increase injectivity) Well convertion ( producer to injector) Improve the treatment and transportation Modification patterns of injection and/ or EOR projects implementation (improve the recovery factor and economic benefits) Review the devolopment plan

31 Water management cost How affect the total cost

32 Lifting cost vs % of water produced Reference: SPE (2001) Forecast Techniques for Lifting Cost in Gas and Oil Onshore Fields - Ricardo E. Martínez-Perez Companc

33 Lifting Cost Distribution Average in GSJB Surface Manteinance 17% Personel 12% Others 5% Oil Treatment 3% Water Treatment 3% Energy - Fluid Lifting 15% Energy - Water Injection 8% Sub-Surface Manteinance 35% Energy - Fluid Transportation 2% %

34 Well Integrity Management

35 Problem description in GSJB Due to the Environmental Security Regulation, it is necessary to guarantee a perfect mechanical integrity in injector wells. This means to obtain hermeticity in the Casing- Packer-Tubing system, between the top Packer and well-head, during the operative life of the well. The injector wells in the Golfo San Jorge Basin are subjected to extreme variations of operative conditions (pressure and temperature), which cause premature failure in assembly

36 Enviromental Requirements Protect the fresh water zones Control the survellance of the repaired injector wells Ensure the control of annulus pressure (second barrier) Circumferential Acoustic Scanning Tool-Visualization (CAST-V)

37 Conclusions In mature fields, some times the water control is not an optinons, and it`s necesary to produce water for producing oil. Investment in treatment facilities, distribution and injection will be required A continue water balance a and surveillance is important for improving the oil production Continue lifting cost analysis is requiered in mature fields EOR projects implementation could be an option for improving the recovery factor, but it will depend on the return on investment (EOR projects can have long-term results) Team work between Production, Reservoir and Facilities Engineering and Production Operations is necesary for developing and monitoring water flooding projects, and managing the water distribution Improving the Water Management Process we can Increasing the Asset Value"

38 References Some Applications of Diagnostics under High WOR Production. SPE Applied Technology Workshop Management of High WOR/High Gross Production Oilfields. Comodoro Rivadavia, Argentina Francois Groff. Schlumberger Options to Solve Casing Leaks - SPE ATW Well Integrity Workshop From Conception To Abandonment. Buenos Aires, Argentina November, Fernando Bertomeu Daniel Villota (Sinpec Argentina) Integrity Wells in Mature Fields - SPE ATW Well Integrity Workshop From Conception To Abandonment. Buenos Aires, Argentina November, Lamberghini Lucia - Teodoulou Marcelo-Melina Carrizo (Pan American Energy Argentina) SPE (2001) Forecast Techniques for Lifting Cost in Gas and Oil Onshore Fields - Ricardo E. Martínez-Perez Companc Case History: New Developments and Applications of the Circumferential Acoustic Scanning Log to improve the Identification of Pipe Corrosion for Wells in the San Jorge Basin, Argentina. SPE Applied Technology Workshop Management of High WOR/High Gross Production Oilfields. Comodoro Rivadavia, Argentina Diego Morelli, Alberto Utrera, Marcelo Teodoulou and Ernesto Mendonca.Pan American Energy LLC / Emiliano López, Carlos Frias and Claudio Quintavalla Halliburton Wireline and Perforating Services Estadísticas de producción Cuenca del Golfo San Jorge. OilProduction.net Slickline y wireline in intervenciones de pozos inyectores de agua en proyectos de recuperación secundaria. Omar Maturana. Secondary Recovery Operations

39 References Lifting Cost Analysis in Golfo San Jorge Basin. Alejandro Figueroa. ENAP Sipetrol Argentina Energy Balance in Mature Fields. Mariano Ciapparelli. ENAP Sipetrol. Argentina Golfo San Jorge Basin: a case study of mature field development in Argentina. (SPE Student Contest LACPEC Ciudad de México) Ing. Barrientos Soledad Vanesa, Universidad Nacional de la Patagonia San Juan Bosco. Faculty Sponsor: Ing. Marcelo Hirschfeldt. Universidad Nacional de la Patagonia San Juan Bosco. Argentina Acknowledgments The author thanks colleagues from the Golfo San Jorge Basin (Argentina) to share their valuable experiences for this presentation: Alejandro Figueroa, Enap Sipetrol. Argentina Daniel Casal, CAPSA. Argentina Fernando Bertomeu, Sinopec Argentina Hector German Moyano, Pan American Energy. Argentina Leoncio del Pozo, CAPSA. Argentina Marcelo Teodoulou, Pan American Energy. Argentina Mariano Ciaparelli, Enap Sipetrol. Argentina Sergio Izquierdo, YPF S.A. Argentina

40 Clemente Marcelo Hirschfeldt

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