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Rising to the Deepwater Challenges: Opportunities & Solutions to Develop Green Fields of Eastern Offshore, India Bhaskar Konala Manager (Reservoir) ONGC.

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Presentation on theme: "Rising to the Deepwater Challenges: Opportunities & Solutions to Develop Green Fields of Eastern Offshore, India Bhaskar Konala Manager (Reservoir) ONGC."— Presentation transcript:

1 Rising to the Deepwater Challenges: Opportunities & Solutions to Develop Green Fields of Eastern Offshore, India Bhaskar Konala Manager (Reservoir) ONGC

2 Overview of east coast Potential of east coast Deepwater definition ONGC’s deepwater portfolio & development opportunities Case studies Technological challenges & solutions Conclusions Outline

3 Overview of east coast Potential of east coast Deepwater definition ONGC’s deepwater portfolio & development opportunities Case studies Technological challenges & solutions Conclusions Outline

4 Overview of East Coast Bengal Basin (Category III) Mahanadi Basin (Category II) Krishna Godavari Basin (Category-1) Cauvery Basin (Category-1) Bay of Bengal India

5 Overview of East Coast India is an emerging deepwater region 1 million sq km sedimentary basin (Beyond 200m WD) 54 deepwater blocks offered by GOI (0.52 million Sq Km) Aggressive exploration activities  76 exploratory wells drilled  Avg drilling density 0.15 wells/1000 Sq Km One of the least explored regions in the world Major discoveries in Krishna-Godavari Basin Significant unrealized potential

6 Overview of East Coast NELP Blocks, East Coast India

7 Overview of East Coast Krishna Godavari Basin Andhra Pradesh Major strikes KG-DWN-98/3 (RIL) KG-D6 & MA-6 KG-DWN-98/2 (ONGC) DWN-D DWN-E DWN-A DWN-N Annapurna Padmawati Kanakadurga DWN-U DWN-W Ultra Deep-1 KG-OSN-2001/3 (GSPC) Deendayal - 98/2 - 98/3 GSPC Blk

8 Overview of east coast Potential of east coast Deepwater definition ONGC’s deepwater portfolio & development opportunities Case studies Technological challenges & solutions Conclusions Outline

9 Production Potential PY-3 Field, Cauvery Offshore Producing from July 1997 (JV) Water depth ~50-400m Nannilam formation Cretaceous age 4 wells API 50 deg India

10 Production Potential Ravva Field, KG Offshore (Shallow) Producing from March 1993 (JV) Water depth 8-15m Ravva formation, Miocene age 21 wells 8 platforms PI : BBl/d/ksc India Hyderabad Ravva

11 Production Potential KG-D6 Gas Field (KG-DWN-98/3 Block), KG Deep Offshore Reliance discovery Major Gas fields: D1 & D3 60 km from shoreline Water depth m Godavari Clay formation Plio-Pliestocene age High productivity reservoir 5” & 7” production tubing 18 subsea wells 60 MMm3/d gas MEG Line Umbilical distribution hub Deepwater PLEM Manifold Flow lines umbilical Well Subsea distribution Assembly Unit Control Riser Platform 24”X25Km

12 Production Potential MA-D6 Oil Field (KG-DWN-98/3 Block), KG Deep Offshore Reliance discovery Water depth m Cretaceous age Gross thickness : 194m (GCG 170 m, Oil 24 m) Good productivity reservoir 6 subsea wells tied to FPSO 35K Bpd oil

13 Overview of east coast Potential of east coast Deepwater definition ONGC’s deepwater portfolio & development opportunities Case studies Technological challenges & solutions Conclusions Outline

14 Different companies… different definitions… >300m Deepwater >1500m Ultra deepwater Definition changing with time & technology >500m Deepwater >2000m Ultra deepwater ONGC >250m Deepwater >2000m Ultra deepwater Deepwater, Variable Definition

15 Overview of east coast Potential of east coast Deepwater definition ONGC’s deepwater portfolio & development opportunities Case studies Technological challenges & solutions Conclusions Outline

16 ONGC’s Deepwater Portfolio DWN-U (1265m) Kanakadurga (500m) Annapurna (1081m) DWN-A (706m) Padmawati (464m) DWN-E (664m) DWN-N (606m) DWN-D (603m) UD-1(2800m) DWN-W (1283m) KG-DWN-98/2 Block (NELP) ONGC 90% PI Cairn 10% PI 8 gas discoveries 3 oil discoveries Water depths m Marginal fields Large inter-field distances Significant oil and gas reserves Excellent well productivities Waxy crude ( API 24 deg) Low GOR G-2 (451m) Oil Gas India

17 Oil Gas G-4 (430m) G-4-6 (450m) IG Block (PEL) 98/2 Block PEL block wholly owned by ONGC Adjacent to 98/2 NELP block Pliocene gas in G-4 Cretaceous oil in G-4-6 Water depths ~ 450m Marginal size discoveries Significant reserves Excellent well productivities ONGC’s Deepwater Portfolio India

18 Marginal fields with substantial reserves Standalone development becomes sub-economical Cluster development by categorization of fields Grouping based on water depth, fluid type, pressure, vicinity etc. Creating common engineering facilities Hiring the nearby RIL infrastructure Development Opportunities Oil Gas 98/2 Block 98/3 Block (RIL) PEL Blk

19 Development Opportunities DWN-N Conceptual Development Plan Oil Gas Expected gas and oil prod, 40 MMm3/d & 25K bpd respectively

20 Water depth 2850m ONGC discovery Large free gas field Large reserves Good reservoir productivity Expected gas production ~30 MMm3/d Development Opportunities KG-DWN-98/2 Ultra-deep field UD Fields in similar water depths developed in GoM UD 2X20X75 km Conceptual Development Plan India

21 Overview of east coast Potential of east coast Deepwater definition ONGC’s deepwater portfolio & development opportunities Case studies Technological challenges & solutions Conclusions Outline

22 Case Studies Deepwater milestones s

23 Case Studies BC-10 Block (Campos Basin), Brazil Water depth m Shell 50%, Petrobras 35% & ONGC 15% 3 fields (Ostra, Abalone & Argonauta) tied back to FPSO Espirito Santo Heavy oil (Api 15-24°), low GOR, thin reservoirs 9 Subsea oil wells & 1 GI Subsea oil & gas separation, oil pumped to FPSO thro ESPs Oil production bopd Reserves 400 Million bbls (64 MMm3) FPSO capacity : 100,000 BOPD 50 MMscf/d gas Heavy oil processing Espirito Santo Horizontal wells Electrical umblicals Artificial lift Brazil

24 Case Studies Independence Hub (GOM), Ultra deep (2700m) (2410m) (2700m) (2550m) (2750m) Fields tied-back to a deep draft semi-submersible platform (Independence Hub) Ten gas fields in eastern ultra deepwater GOM developed Water depth m Operator : Anadarko Reserves : ~70 BCM Independence Hub (2700m) (2740m) (2550m) (2400m) Q (2420m) Gulf of Mexico Mississippi Canyon Blk

25 Case Studies Independence Hub (GOM) Independence Trail (24”X 220 km) Processing Capacity : 30 MMm3/d gas Condensate : 700 m3/d Water : 500 m3/d Gas production : ~25 MMm3/d No. of wells : 17 Fixed Junction Platform (West Delta 68) Independence Hub Tennessee Processed gas is transported through 24” pipeline (Independence Trail) of 220 Km

26 Perdido Gulf of Mexico Silver Tip (2812m) Frio Great White (2438m) Case Studies TX Tobago (2926m) Perdido Development (GOM), Ultra deep Water depth m JV partners (Shell, Chevron & BP) Operator : Shell (35% PI) Topside processing : 100,000 bopd, 6MMm/d gas & 80K bwpd Oil Production : 80,000 Bpd 22 subsea wells Subsea gas & liquid separation Subsea pumping to SPAR Perdido, Ultra deepwater SPAR Oil export line 130 km & gas export line 170 km (cut & tie)

27 Overview of east coast Potential of east coast Deepwater definition ONGC’s deepwater portfolio & development opportunities Case studies Technological challenges & solutions Conclusions Outline

28 Reservoir characterization Dynamic reservoir modeling Offshore facilities and flow assurance Uncertainty and risk analysis Environmental issues, health & Safety Technological Challenges

29 Reservoir characterization G&G model from high quality seismic imaging Robust fault modeling Petro-physical characterization Cores Analysis Reservoir fluid analysis Extended well testing Technological Challenges Effective porosity model Sweetness attribute Permeability model Well-A Net to Gross Well-A -A -A

30 Dynamic Reservoir Modeling Up scaling of static model by MDT Retention of reservoir heterogeneity Reservoir fluid & rock physics modeling Understanding drive mechanism Achieving higher production with less wells Placement & Type of wells (vertical, HW, Multi-lateral, intelligent) Increased oil recovery & enhanced reserve portfolio Technological Challenges -

31 Offshore Facilities Concept selection Technological Challenges - Water depth Field size & Life Remoteness of field location Location of infrastructure Number of wells / drilling centres Dry Tree or Wet Tree Drilling or work over capability Production Capacity Total Topsides weight Riser Technologies Constructability and lead time Capex & Opex

32 Offshore Facilities… Technological Challenges - TLP (148m (Hutton) to 1500m) FPSO (13m (Armada) up to and beyond 3000m) Spar (500m up to and beyond 3000m) Semi-submersible (75m (Argyll) up to and beyond 3000m) Compliant tower (<600m) Subsea to Shore, Ormen Lange (subsea processing) Semi-submersible Spar FPSO TLP Compliant Tower

33 Flow Assurance Prevention and remediation of; Hydrates Paraffin Scales Asphaltene Corrosion Erosion Production of heavy oil with low GOR Mechanical treatment; Pigging Scrapping Chemical solvents Thermal intervention Sand incursion & control measures Technological Challenges - Hydrate Paraffin

34 Uncertainty & Risk Limited and uncertain data in deepwater Key uncertainties… Seismic & Faults Geological model Hydrocarbon in-place Facies variation & Heterogeneity Reservoir connectivity & extent Contacts Porosity & Permeability Relative permeability Drive mechanism & Aquifer strength Recoverable reserves Concept selection for offshore facilities Flow assurance, etc Technological Challenges -

35 Environment & Safety Issues Understanding of harsh met-ocean conditions for safe & efficient deepwater development Adequate conservation & protection of marine ecosystem Safe disposal practices of drill cuttings, fluids & chemicals (methanol, hydrate inhibitors etc) Effective emergency response Compliance to safe operating practices& contingency measures Avoiding oil spills Gas hydrates as hazards Technological Challenges - Macondo oil leak Macondo Blowout (GoM)

36 Wide angle azimuth seismic acquisition for high resolution imaging and illumination Robust reservoir characterization Use of MWD and LWD while drilling (Real time monitoring) for effective geo-steering Pore pressure management Advanced reservoir surveillance Extended well test Interference test Solutions - Live feed from rig Smart gauges Virtual reality Pore Pr Prediction

37 Solutions Robust appraisal plan for delineation Subsea cluster development of marginal fields Intelligent wells / digital field Multiple completions Controlled WI for good sweep Horizontal completions

38 Solutions Robust concept selection, FEED and detailed design of production system leads to increased system reliability Characterizing multiphase fluid and robust design of subsea flow system to mitigate deepwater flow assurance challenges The uncertainty of the variables that make significant impact on the economic viability of deepwater can be identified & evaluated with experimental design JV for deepwater expertise and risk mitigation Effective contracting methods for timely completion of projects Special dispensation on gas price and incentives by GOI for development of deepwater resources

39 Conclusions India is an emerging deepwater hub World-class discoveries made in KG Basin ONGC’s deepwater discoveries in east coast has the potential to significantly contribute to the energy demands of India Technology is the key enabler to convert resources into economical reserves Fields in similar water depths are developed elsewhere Critical areas to be considered in deepwater development; Reservoir characterization, dynamic modeling, flow assurance, uncertainty & risk analysis & environment & safety issues

40 Thanks for your attention


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