Tight Gas Reservoirs R&D Project Approach

Transcription

1 Tight Gas Reservoirs R&D Project Approach EBN TNO Tight Gas Symposium Utrecht, September 19, 2006

2 Tight Gas Reservoirs: some definitions Applies to the sandstone and carbonate reservoirs, with all type of geometry (thick, multi-layer, fractured,...) and all types of traps (structural, stratigraphic, deep basin, ) Matrix Permeability : 1 µd to 0.1 md Porosity: 3-5% to % (effective) No or limited natural flow: Typically the initial flow before stimulation is less than 0.5 MMscfd (~ Sm 3 /d) Permeability (md) Tight Gas Not economical 5 10 Economical flow without stimulation Tight Oil Porosity (%) 2

3 Tight Gas Reservoirs: why a R&D Project? Total's current portfolio 3

4 Tight Gas Reservoirs: why a R&D Project? The Technical challenge various tight sands fields which are difficult to develop The Reserves challenge Reserves replacement is the key challenge for the O&G Industry, particularly because of ambitious growth objectives Access to conventional Reserves is getting difficult Develop Tight Gas Reservoirs is one of the ways to face the reserves challenge Consolidation of Know-How is a driver 4

5 Tight Gas Reservoirs R&D Project: Problematic IDENTIFICATION Basins characterization Structural and/or sedimentological heterogeneities identification EVALUATION Static reservoir evaluation Coring, Logging Dynamic reservoir evaluation Testing Reserves estimation PRODUCTION Optimize well architecture Drilling performances (ROP) Reduce formation damages Fracturing 5

6 Tight Gas Reservoirs R&D Project: Programme Technical Studies with the Métiers Pilots with the Affiliates Partnership with Key Actors 6

7 TGR R&D Project: Technical Studies Depth (m) 0- IDENTIFICATION Faulting Corridors Induced Fissuration Uplift σ1 relax A: Well uplifted Diffusive µ-fissurat Gas expands Swi < Swirr Biogenic Limit GEOLOGY Basin Scale and Field Scale: Water expelled Faulting Corridors Induced Fissuration Hc charging B: Partially uplifted Uplift Rate Regional Geology setting & Reservoir review Diagenesis impact and integration to regional setting Natural Fracturing and Impact on Productivity in TGR d ee Sp Water Swirr Microfractures (Thin Section) Joints (well imagery) rs rrie a b or s n ai Dr Faults Corridors Multi-azimuthal 3D seismic FRAC monitoring / Production monitoring using Micro-seismic data analysis (2D, 3D seismic) Monitoring de l extension de la frac sur puits traité et sur puits d observation Capteurs Microseisme Reservoir Fracture A partir d un puits d observation? Monitoring pendant l injection? Faible bruit et bonne sensibilité? Full mapping (shear slip events)? La distance entre puits doit être faible Top Gas shows (3D seismic if large enough) Borehole seismic / X-well seismic (3D multi azimuth VSP) for natural fracture 7 D: No uplift Time ( Million years ) GEOPHYSICS Identification of heterogeneities ( Sweet Spot ) mainly structural C: Poorly uplifted t lif Up ? Arrêt de production sur le puits d observation Capteurs Microseisme Reservoir Fracture A partir du puits traité? Monitoring pendant l injection et le fall off? Bonne sensibilité? Evite le puits d observation? Le puits est en connexion directe avec la frac. Interprétation en ondes guidées possibles

8 TGR R&D Project: Technical Studies EVALUATION PETROPHYSICS Measurements : Permeability and porosity, Swi and salinity, Compressibility effect, Capillarity pressure LOGGING Log measurement interpretation Fracture description using DSI+FMI WELL TESTING Well test data analysis in TGR WFT measurement Decline curve analysis RESERVOIR MODELLING Practical well modelling Permeability up-scaling 8

9 TGR R&D Project: Technical Studies PRODUCTION WELL PRODUCTIVITY Well productivity model Water lift in fractured well HYDRAULIC FRACTURING Standardise practices Ffeasibility in horizontal wells Fluid characterisation and modelling of damage at the face of the frac. PEAs follow-up + US analogues + JIPs with Service C ies Liquid blocking prevention 9

10 TGR R&D Project: Technical Studies cont d PRODUCTION GEOMECHANICS Stress anisotropy review Well stress model Stress in heterogeneous formation Validation of structural concept Hydraulic fracturing in natural fractured reservoirs DRILLING & COMPLETION Under balance drilling database review Casing design Completion review 10

11 TGR: Pilots IDENTIFICATION 3D Multi-azimuthal seismic Multi azimuth 3D VSP Frac monitoring using Micro-seismic EVALUATION SonicScaner PRODUCTION Water blocking Hydraulic fracturing: proppants, injected fluids Productivity Pilot Under Balanced Drilling Multi-lateral sub-horizontal drains 11

12 TGR: Partnerships Universities (Europe, US, Canada, China,...): University of Texas (Austin) UPPA (Pau) Université de Bordeaux / CNRS University of Alberta (Edmonton) Institutes and Laboratories: IFP Texas A&M (College Station) - Crisman Institute FracTech SCOTIA OMNI VIPS Ltd and Rockfield Sofware Ltd CSIRO (Australia) Services Companies and/or other Operators 12

13 TGR R&D Project THANK YOU FOR YOUR ATTENTION The authors would like to thank the R&D management of TOTAL for their authorization to present this paper 13