The Deployment of an Azimuthal Resistivity Tool for Geosteering - A Case Study from the Foinaven Field (North Sea)*

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1 The Deployment of an Azimuthal Resistivity Tool for Geosteering - A Case Study from the Foinaven Field (North Sea)* Martin Bedrock 1 and Darren Moody 1 Search and Discovery Article #40540 (2010) Posted June 28, 2010 *Adapted from oral presentation at AAPG Convention, New Orleans, Louisiana, April 11-14, BP Exploration, Dyce, Aberdeen, United Kingdom (bedrocm@bp.com) Abstract The use of an Azimuthal Resistivity tool has been evaluated on BP s Foinaven Field with the expectation that its ability to look deeper into the rock formation would provide key information on bedding dip and fluid/structural boundaries to greatly improve geosteering capability. The key drivers were to maximise net sand and reduce the likelihood of unplanned sidetracks. This presentation explains the results of Baker Hughes AziTrak tool in three wells and how this has influenced the future deployment of the tool. The turbidite sands of the Foinaven Field are generally drilled at low angle to bedding. Wells have been previously geosteered using azimuthal gamma and density. However, with limited depth of investigation there is the possibility of exiting sand before the need for a geosteering decision is realised. The azimuthal resistivity tool, in contrast, has a greater depth of investigation which potentially gives much better predictions of fluids and lithology above and/or below the well bore. The Azimuthal Resistivity tool was initially evaluated in Foinaven P111 well. The Azimuthal Gamma and Density were run and used for geosteering in real-time with the Azimuthal Resistivity run in memory mode to permit later assessment as a future logging option. The results showed that the Azimuthal Resistivity tool could have been used to inform better geosteering decisions, potentially saving time and cost of additional sidetracks. The Azimuthal Resistivity tool was subsequently run in P16Z, real-time, and resulted in (i) avoiding the premature exit of a thin sand body by identifying an underlying conductive shale bed, (ii) recognising a key channel transitions, and (iii) confirming the presence of a water-wet sand below the bore thereby initiating an earlier than usual decision to steer up. Copyright AAPG. Serial rights given by author. For all other rights contact author directly.

2 Finally, the Azimuthal Resistivity tool was run in well P43. The trajectory was planned to cross a series of turbidite channels with limited scope for geosteering. The high resolution of the Azimuthal Resistivity tool did, however, provide information on the dip and thin-bedded nature of the channel sands and influenced the decision to turn the well trajectory downwards at the toe of the well to pick up additional net sand. Based on the above experience it is concluded that Azimuthal Resistivity data can usefully influence trajectory decisions where there is flexibility to geosteer. Where trajectories are more geometric, then Azimuthal Resistivity is less useful.

3 The Deployment of an Azimuthal Resistivity Tool for Geosteering - A Case Study from the Foinaven Field (North Sea) Martin Bedrock and Darren Moody

4 Outline What successful Geosteering looks like Foinaven field background Azimuthal Resistivity Tool design Azimuthal Resistivity Tool data received Pilot study in P111 Azimuthal Resistivity for Real-Time Geosteering P16z Azimuthal Resistivity for Real-Time Geosteering P43 Conclusions

5 What successful geosteering looks like Success criteria Maximising contact with net sand Understanding which are the best sands to geosteer Avoiding water To know which direction to geosteer TD early Evolved Foinaven Enabling strategy Cut down through stratigraphy before geosteering provides a lookahead to which sands to geosteer especially in low n/g sands Use imaging tools (GR and density) to geosteer Wishlist An azimuthal tool which looks ahead or deep into the formation to see roof, floor, next sand, water.

6 Foinaven Field Background UKCS blocks 204/19a, 204/24a & 204/25b Main field + East Foinaven + T35 + T25 UKCS blocks: 204/19 & 204/24a ~500m water depth ~500m water depth Good quality Tertiary ~2200 m tvdss; 26 API crude 190km West of Shetland Is Sanctioned in 200 mmbbls; 1 st prod Nov-97 - produced by Jun- 04 STOIIP [01/10] 1.4 bnbbls Produced [01/10] 304 mmbbls of oil Subsea development with Floating Production Storage and Offtake (FPSO) vessel Drilled to date: 26 producers, 12 water injectors, and gas disposal well (2 water injectors currently being drilled)

7 Foinaven Field and Reservoir Layering Foinaven producers geosteered in 10-20m thick reservoir units P111 P16z P43

8 Azimuthal Resistivity tool: AziTrak Provides a deep reading azimuthal resistivity measurement (bed boundary detection). Provides the direction and the distance to bed for boundaries up to 17 ft (5 m) away from the borehole This means: the ability to optimise bit position within the reservoir with respect to stand-off from a fluid or lithological boundary.

9 The Azitrak tool data received A B C Distance to bed shows depth of detection and distance to boundary Azimuthal Resistivity Azimuthal Density Entered reservoir sand at 8100ft A. Depth of detection ~4m, shows sand below but encroaching shale seen from 8300ft B. Shale encountered at 8450ft, DOD limited to ~1.5m C. Re-entry of sand indicated by Azimuthal Resistivity at 8490ft & moving away from bed boundary (cf Azimuthal image brightening)

10 204/19a 204/24a Sanctioned Well 0 kilometres 1 204/24a-6 A11z/P12 A09/W14 A08/WP14 A07/W11 A18z/W16 A17y/W11z A13z/P19 204/24a-2 A05/P18 204/24a-2Y A15/W15 A02/P13 204/24a-4 A10/W13 A06z/P16 A14/P /24a-2Z A03/P17 204/19-3A A04z/P11 204/24a-3 P111 A01/P15 204/24a-5 204/19-9 B02z/P21 A16z/P11z P111 W17 B13y/P211 A12/W12 B08/W25 B05/P23 B03/P22 B11z/P29 204/24-1A P111 P212 B07/P24 B04/W24 204/19-4A B12z/P210 B10z/P28 204/24a-7 B09z/P26 B01y/P27 B06y/P25 24a-8/W22 204/24a-8 A2/W41 A4z/W42 A1z/P41 204/25b-5 A3/P42 204/20a 204/25b Foinaven P111 Objectives and Plan P111 Objectives Access reserves in the T34LC and T32) sands by drilling approximately 960m of 8 ½ hole. Dual zone producer on west flank of Panel 2 T35 T34U T34L T32 T31 T25 PANEL 3 PANEL 4 N PANEL 1 PANEL 1 PANEL 2 PANEL 2 PANEL 0 1 FPSO Foinaven Field Schematic Map 2 WING 4 EAST Data Acquisition 8½ hole: azimuthal GR, Res (2MHz, 400 KHz), Azimuthal Density, Neutron. Pressures (TesTrak). LWD NMR (MagTrak) Azitrak run in memory mode 36 to 620 m MD 17½ to 1681 m MD 12¼ to 2481 m MD 8½ to 3438 m MD 3000 T32 SNA Map DC1 1 km DC1 West Producer P111 T34L SNA Map Gas Cap Central Injector W17 1 km P111 Planned Trajectory 9 ⅝ casing point GOC T34U T34LC 2900 T34LB Main bore 8 ½ Depth (m) T32E OWC SW 500 m Vertical exaggeration approx. x3 NE

11 P111 Part 1 Azimuthal Resistivity evaluation Post-well interpretation T34L C sand A B Dual bed sand possibly pinching out Dark grey bed result of dual bed analysis. Light grey bed is nearest conductive bed Entered reservoir sand at 8100ft Azimuthal Resistivity Azimuthal Density C A. Depth of detection ~4m, shows sand below but encroaching shale seen from 8300ft B. Shale encountered at 8450ft, DOD limited to ~1.5m C. Re-entry of sand indicated by Azimuthal Resistivity at 8490ft & moving away from bed boundary (cf Azimuthal image brightening)

12 P111 Part 2 Azimuthal Resistivity evaluation A T32 E sand A. Cut down stratigraphy according to plan T32 poor sand quality B Better sand quality B. Drilling bed parallel AziRes indicates better quality rock above than below Decided to steer upwards at 9670ft to find better sand Better sand quality Azimuthal resistivity suggests we could have made this decision >200ft earlier

13 P111 Part 3 T32 E sand Found poor sand. At 10860ft pushed wellpath down to find sand suggested by seismic. A B Encountered floor of T32, trajectory raised from 11115ft Azimuthal Resistivity & Distance to Bed data would have: A. Predicted shale below B B. prevented ~200ft of shale from being drilled

14 P111 Conclusions Pilot in Memory Mode Strategy of cutting stratigraphy in initial downpass provides a look-ahead to target best sand AziRes foresaw thin intermediate shale in T34L C sand. Azimuthal Res confirms shale is thin AziRes would have prevented a steer down in the latter part of T32E with resultant drilling of >200m of shale Decision to steer upwards into better sand in the T32 E unit would have been made much earlier with the Azimuthal Resistivity data Based on these advantages Azimuthal Resistivity was used in Real-Time in two subsequent wells

15 P16z Objectives P111 P16z P16Z Objectives Sidetrack P16 to an up-dip location east of the current location and extend into Panel 2 North. Mill a 9 5/8 window at ~2010 m MD in P16. Drill approx m of 8 1/2 hole to TD, including 785 m of reservoir section (T34LB1 and T34LB2 Sands). Avoid drilling gas-cap P43 T34LB2 T34LB1 T34U (gas) GOC Depth (m) T34LC T32E T34LB2 OWC 200 m S Vertical exaggeration approx. x3 N

16 P16z RT Azimuthal Resistivity - 1 T34LB2 A B A.Thin Shales at base of channel seen in D2B and Azi Res T34LB1 Actual Plan A Cutting in/out of thin shales but following planned trajectory Thin-bedded sands

17 P16z RT Azimuthal Resistivity - 2 T34LB1 B T34LB2 Actual Started planned drop at 3423m Advanced indication of water and shale. Start to build at 3590m Plan A Geosteering thin sand C Wet Sand

18 P16z Conclusion Limited room for Geosteering in P16z due to standoff from gas-cap but Azimuthal resistivity helped to identify basal shales in B2 sand. Successfully geosteered sands in B1 channel. AziTrak was able to confirm the presence of the water-wet sand and prove it was below the bore, initiating the decision to steer up.

19 P43 post-pilot plan Challenges Navigate across a sequence of incised channels to drain T32 & T34L sands. Identify the presence of sand during the landing phase within the T32 channel sequence and optimise the well-path to attain maximum reservoir contact. Based on low n/g pilot well decision made to cut across stratigraphy to maximise sand connectivity. Limited scope for geosteering P43 Actual Trajectory 9 5/8 casing point T32 T Top T32 Ch3 T31U T T Ch 4 T34L Ch 9 Depth (m tvdss) Depth Corrected Seismic volume T28 204/25b-A5 Appraisal

20 Channel 3 interpretation Drilled geometrically through Channel 3 Actual Plan Shale section, thin sands A Thin nature of sand identified by D2B and AziRes image

21 Channel 4 Interpretation Channel 4 entry confirmed by biostrat Plan Entered good sand & maintained 2m standoff from roof Actual 3710m climbing up through stratigraphy at 89 deg. AziRes indicates 10 deg dip, cannot follow thin sands 3804m decide to drop trajectory to follow seismic bright spot. AziRes indicates only thin sand beds encountered. Successful geosteering of sands using Azimuthal Resistivity

22 P43 Conclusion Limited room for Geosteering due to poor result in T32 pilot and decision to cut stratigraphy geometrically Azimuthal resistivity confirmed the thin-bedded nature of the sand and structural dip Azimuthal Resistivity aided geosteering of sand in Channel 4.

23 Final Conclusions Success criteria Maximising contact with net sand Understanding which are the best sands to geosteer Avoiding water To know which direction to geosteer TD early Traditional Foinaven Enabling strategy Cut down through stratigraphy before geosteering provides a lookahead to which sands to geosteer especially in low n/g sands Wishlist An azimuthal tool which looks ahead or deep into the formation to see roof, floor, next sand, water.

24 Acknowledgements Foinaven Darren Moody Peter Lumsden & Foinaven subsurface team BP Partners Marathon Petroleum West of Shetlands Ltd Marubeni Oil & Gas (North Sea) Limited Baker Hughes David Holborough

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