DEVEX Moving in the Right Direction; Realising Upside Potential in a Mature Field Using Real Time 3D Geo-Steering Technology

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1 DEVEX 2010 Moving in the Right Direction; Realising Upside Potential in a Mature Field Using Real Time 3D Geo-Steering Technology Authors: Lisa Chisholm, Chevron Upstream Europe David Holbrough, Baker Hughes Co-Authors: Haakon Dahle-Smith, Chevron Upstream Europe; Mandy Ponton, Chevron Upstream Europe; Mike Unger, Chevron Upstream Europe; Chevron 2008

2 Agenda n Introduction to the Captain field n Chevron well objectives n AziTrak tool specifics n Case example using AziTrak n Results and discussion n Questions 2

3 Captain Field Location Block 13/22a n LOCATION 80 miles NE of Aberdeen, UK Northern North Sea n EQUITY 85% CVX, 15% KCCL n FIRST OIL 1997 n Upper Captain Sand Reservoir ~ 700 MMbbls STOIIP n Development water flood through horizontal wells and pumps 3

4 Captain field geological cross-section n Upper Captain Sand reservoir Ø Main producing interval Ø Shallow, low relief structure Ø Combined structural and stratigraphic closure

5 Reservoir characterisation Upper Captain Sand reservoir n Unconfined Turbidite sheet system n Massive sands n Unconsolidated n 98% average N:G n 32% average Porosity n 5500mD average Permeability n Top seal = Rodby/Carrack shale n Heavy oil of API gravity n High viscosity crude cp

6 Challenges imaging and mapping top reservoir SW NE n Strong Base Chalk reflector obscures Top UCS seismic response

7 Key uncertainties in the Captain field n Main uncertainty: n Top Reservoir depth n Top Reservoir surface high rugosity 7

8 Captain field - drilled well location Top Upper Captain Sand depth map n 180 well penetrations n Well located in NW of field targeting attic oil NW of existing producer and above OWC 8

9 Well objectives n Drill safely n Geosteer for attic oil place well in an optimal location n Target unswept reserves between abandoned producer and the northern wedge above the OWC 9

10 Dip section across northern wedge of field n Most northerly well in field step out from nearest wells (~100m)

11 AziTrak - Tool specifics AziTrak used on four wells six boreholes, within Captain field Provides a deep reading azimuthal resistivity measurement for Reservoir Navigation applications (bed boundary detection) Distance to bed varies with the conductivity contrast of reservoir Captain reservoir allows depth of detection of up to 14 ft (4 m) Directional Near Bit Inclinometer Gamma ray imaging Annular Pressure Multiple Propagation Resistivity (MPR) 8 compensated resistivities Rv / Rh inversion Deep azimuthal propagation resistivity Real-time deep image Real-time distance to remote boundary inversions Directionality of detected boundary (s) 11

12 Communication lines when drilling using AziTrak RNS Software WellLink Display RNS SUPERVISOR OPERATIONS TEAM OFFICE TEAM Rig site RNS Software WellLink Display Onshore RNS Team n Integration and communication are key RIGSITE TEAM

13 Real time geosteering decisions Up Down Up Down Left Right Steering Rose Steering Rose Model surface curtain Up Down APR image GR image Signal amplitude Resistivity GR Recent improvements in visual aids enable easy interpretation and faster decision making n

14 Final AziTrak data through producer hole Dip information on shales helps us make geosteering decision hold angle or drop Drilled above (>32ft TVD) above planned well path Dip in well = KOP for pilot hole Tracking very close to roof down to TVD limit TD in roof very shallow dip Model surface curtain Up Down Left Right Distance to Bed APR image GR image > 14ft 12 - Signal 14ft amplitude 10-12ft 8-10ft 6-8ft 4-6ft 2-4ft 0-2ft Resistivity shale Distance to Bed (%) Followed roof on average 7ft below Average height above plan = 23ft GR Percentage of Lateral (%)

15 Seismic section along the well SW NE Drilled well path Base Chalk Planned well path bulk shift 21ft down to tie chalk at heel Production interval 5309ft MD OWC ~5Km n Poor seismic tie n Difference between planned and drilled wellpaths

16 Schematic cross-section highlighting results and discussion Chalk R/C Top UCS 12ft low to prognosis Original Top UCS surface Dip in well = pilot sidetrack location *Azi Trak modeled Top UCS TD in Sola Rodby shale 11049ft MD UCS drilled 9 5/8 shoe 71ft from OWC Planned well path OWC = -2982ft TVDSS 60ft from OWC Production interval ft MD n Significant difference between planned and drilled wellpaths n Drilled on average 7ft TVD below Top UCS (reservoir) n Achieved 98% N:G n Completion interval ~ 5000ft MD n Well came on production above the P90 estimates 16

17 Conclusions n Drilling in a mature field requires a flexible approach to well placement Ø Have tools that enable team to make informed decisions Ø Integrate the real time data and incorporate / update the geological model in real time n Ability to think in 3D Ø Consider lateral steering options n Flexible and integrated drilling team Ø Good fast turn around on drilling pilot for upside Ø Good strong communication links set up between onshore and offshore plus BHI and Chevron 17

18 QUESTIONS? 18

19 Backup slides 19

20 Resistivity plot depth of detection 20

21 Resistivity contrasts Wet SST = 2.5 ohmm Oil SST = 140 ohmm Shale = 3 5 ohmm Chalk = 10 15ohmm 21

22 Captain Dynamics - Coning Infill well opportunities Water Coning 5 Yrs Injector Producers INFILL INFILL 25

23 Strike section along well n Producer hole proved TOP UCS follows P90 model n Pilot hole proved up a future second target

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