In-Situ Fluid Analysis in the North Sea

Transcription

1 Applications of Accurate In-Situ Fluid Analysis in the North Sea SPE Vladislav Achourov, Adriaan Gisolf, Schlumberger Andreas Kansy, RWE-Dea, Kåre Otto Eriksen, Statoil Michael O'Keefe, Thomas Pfeiffer, Schlumberger

2 Overview Introduction Downhole Fluid Analysis (DFA) In-Situ Fluid Analyzer Case Studies Conclusions

3 Downhole Fluid Analysis New Tech. for Res. Evaluation Dep pth (m) xx60 xx80 xx g/cc Pressure Gradients Composition (wt%) GOR Ch. 1 (scf/bbl) C2-C5 C1 C6+ water (OD) xx68.2m * g/cc xx75.1m xx85.6m xx00.0m xx06.3m xx g/cc Compositionally graded Pressure (bar) reservoir

4 DFA Technology WFT Dual Spectrometers Grating (16 Channels) Filter * (20 Channels) Fluorescence* & Gas Detector DV-Rod** Resistivity** & spare DFA port IFA P/T Hydrocarbon composition: C1, C2, C3-5, C6+ Carbon Dioxide CO2 Gas-Oil Ratio (GOR) Formation water ph Asphaltene gradient (Colour) OBM Contamination Automatic LQC (detection of mud-coated sensor) Single Phase Assurance for sampling Dew Precipitation (condensate) & Gas detection Near-critical Fluid ID (volatile oil or condensate) Flowline Pressure and Temp (EOS model) InSitu Density** Fluid Resistivity** (for Dual Packer sampling) Expansion ports for DFA sensors (Viscosity)

5 DFA Technology WFT Dual Spectrometers Grating (16 Channels) Filter * (20 Channels) Fluorescence* & Gas Detector InSitu Density** Resistivity** InSitu Viscosity IFA Hydrocarbon composition: C1, C2, C3-5, C6+ Carbon Dioxide CO2 Gas-Oil Ratio (GOR) Formation water ph Asphaltene gradient (Colour) OBM Contamination Automatic LQC (detection of mud-coated sensor) Single Phase Assurance for sampling P/T Dew Precipitation (condensate) & Gas detection Near-critical Fluid ID (volatile oil or condensate) Flowline Pressure and Temp (EOS model) InSitu Density** Fluid Resistivity** (for Dual Packer sampling) Expansion ports for DFA sensors (Viscosity) ** Also available on Quicksilver Sampling Probe

6 Composition From Spectroscopy OD 0.25 CFA PD array Mirror 0.05 OD 0.6 IFA - Grating Spectrometer 0.00 OD 0.6 Wavelength (nm) Research-grade Laboratory Spectrometer Grating st and 2nd DFA generation Filter Spectrometer employ 0.0 Wavelength (nm) Optical Dens OD channels ,600 1,650 1,700 1,750 1,80 W avelength, nm Wavelength (nm) 3d generation DFA Filter Spectrometer has 20 channels It also has Grating spectrometer with 16 Channels on hydrocarbon peak

7 Fluorescence & Reflectance

8 Case Study 1 Fluid Profiling for Connectivity

9 In-Situ Composition and PVT Laboratory Data

10 Case Study 1 InSitu Density Final DFA Density Lab. Density

11 Case Study 2 Complex Reservoir

12 HC Detection With Fluorescence and Density First hydrocarbons detected 1.5 hours before visible on spectrometer composition and GOR

13 Formation Tester Downhole Pump Phase Sequence

14 Dew Point Detection (Retrograde Gas) 2 phase flow 2 phase flow GOR oil gas oil oil gas oil Composition and water fraction Fluor. and Reflect. Flowing pressure Color

15 Dew Point Detection (Retrograde Gas) single phase flow GOR rate decrease single phase flow Composition and water fraction Fluor. and Reflect. Flowing pressure Color

16 Dew Point Detection (Retrograde Gas) single phase flow two phase flow GOR Composition and water fraction single phase flow slow rate increase First dew Fluor. and Reflect. Flowing pressure First dew Color

17 Bubble Point Detection (Volatile Oil) 2 phase flow single phase flow GOR gas oil oil rate decrease Composition and water fraction Fluor. and Reflect. Flowing pressure Color

18 Conclusions Complex reservoirs require comprehensive analysis of fluid differences. Available technologies and answers provide accurate in-situ fluid analysis. Cases studies indicate excellent in-situ fluid analysis Cases studies indicate excellent in situ fluid analysis accuracy of composition, GOR, CO2, density and fluorescence for reservoir connectivities evaluation, saturation pressure detection and sampling quality assurance.