INNOVATIVE EOR & 4D SEISMIC ACHIEVEMENT IN DEEP OFFSHORE. Renaud GAUCHET, Total E&P Russie

Transcription

1 INNOVATIVE EOR & 4D SEISMIC ACHIEVEMENT IN DEEP OFFSHORE Renaud GAUCHET, Total E&P Russie

2 DALIA FIELD DAL 1 DAL 4 CML 1 B200 UMC B250 E LFW LMC LFE CML Block 17 Partnership: TOTAL (op) % ESSO % BP % STATOIL % First Oil: Girassol Dec Jasmim Nov Dalia Dec Rosa Apr Pazflor Aug CLOV June DAL704 DAL748 DAL712 DAL705 DAL734 DAL735 UMC DAL743 DAL744 DAL739 DAL725 DAL727 DAL723 DAL703 DAL726 LFW DAL706 DAL741 DAL733 DAL709 DAL720 DAL731 DAL722 DAL719 DAL715 DAL752 DAL701 DAL702 DAL742 DAL707 DAL716 DAL740 DAL750 DAL738 DAL717 DAL753 DAL732 DAL724 DAL728 DAL713 DAL745 DAL714 DAL711 DAL749 DAL747 DAL721 DAL708 DAL718 DAL736 DAL730 DAL751 DAL710 DAL746 LMC DAL737 DAL729 CML LFE

3 Dalia The Development BUOY Buoy Turret loading system Located 2km from FPSO GUIDELINES FOR THE PREPARATION OF POWERPOINT PRESENTATIONS POSTER DIGITAL SESSION FPSO New large build, double skinned 2 million barrels storage Complex processing Living quarters for 190 people Subsea Architecture Seabed facilities footprint of 100 km 2 71 Christmas trees and 9 manifolds insulated to maintain fluid temperature Water Depths to 1400 m Well Count 71 highly deviated wells, twice that of Girassol, 37 production, 31 water and 3 gas injection Reservoir Complex, heterogeneous bearing heavy acidic oil at low reservoir temperature DALIA Project internal debriefing April 2007 Fluid Transportation 40 km of Pipe in Pipe production loops, 45 km of water injection & gas injection pipes and 75 km of control umbilicals. 8 x Innovative Integrated Production Bundle riser 3

4 POLYMER INJECTION ON DALIA Objective : Enhance sweep efficiency thanks to mobility ratio reduction between water & oil (viscosity) Permeability reduction to water (adsorption - RRF) Mature Technique More than 170 projects worldwide Adapted for reservoirs : With high permeability (few Darcy) At low temperature (30-70 C) With high oil saturation Viscous oil (few cp +) Dalia is a good candidate but : 1st offshore operation High salinity Large spacing : high injection rate per well ICIENCY AREAL SWEEP EFFI λinj. j > λoil λinj. = λoil VERTIC CAL SWEEP EFF FICIENCY (a) (b) Eauwater Water Polymère Polymer Polymer water Injection injection d eau k 2 >k 3 >k 1 k 2 > k 3 > k 1 Polymer injection Injection d eau visqueuse OIL Huile OIL OIL Huile OIL k 1 k 2 k 3 k 1 k 2 k 3 Polymer selection criteria High molecular weight Polyacrylamide Sensitivity to shear (ex: choke, pump valves..) Sensitivity to salt Supplier: very few suppliers worldwide (SNF at St Etienne is the worldwide leader, Fab. USA & Europe) Polymer adsorption : Resistance to the flow (RR RF)

5 DALIA VISCO. MECHANISMS 5

6 FABRICATION OF THE POLYMER SOLUTION Air A simple process but never done offshore Dilution to obtain a viscosity of 3.3 cp at inlet of inj. riser Pneumatic transfer ~2bg N2 generation & Oxygen removal Pol silo Air HP pump w/o significant degradation to WI manifold Pol Pol PSU LP water Maturation Filter 100μm 6

7 SKID & OFFSHORE TEST CONDITIONS Polymer Injection Skid on Dalia FPSO HP pump PSU 7

8 POLYMER INJECTION IMPACT ON PROD. PROFILE Water cut D4P DAL 738 Polymer inj. Polymer impact + 3 years Polymer Pro od (kg/d) D4W0 5 D4P05 D4W0 3 D4S02 0 Well drilled Future well Water cut DAL Water cut 90 DAL Polymer impact + 3 years Polymer Prod (kg/d) Polymer inj. Polymer impact + 6 years Polymer Prod Water cut (water flood) Water cut (polymer flood) Polymer Prod Polymer inj. 0 0d (kg/d) 0 Decision of a phased approach for this World 1 st drilling of a sampler well early evaluation of in situ viscosity 8

9 DALIA 4D SEISMIC MONITORING PROGRAM Baseline 3D HR seismic (1999): Streamer Single vessel acquisition Intensively el used: Structural modeling, sedimentological Achitect Architectural Elements extensions, Facies modelling, Wells Geosteering Depth Time Before Production Dec year First Oil Water & Gas injection year Polymer injection 4D MONITORING OBJECTIVES Field delineation & FDP Gas & Water monitoring - Depletion monitoring definition - 4D Baseline Reservoir model matching Use of these two monitors to design the well sampler 9

10 4D SEISMIC : TOTAL WORKFLOW 4D seismic attributes based on In House inversion software wide spectrum volumic attribute : dvp/vp > 0 water injection (in blue) < 0 Gas exsolution (in red) Well inversion & Vcl dvp/vp dvp/vp d / Rock Physics Model: (Vp, Vs, ) = f(petrophy) to anticipate 4D signature 10

11 PSEUDO IMPEDANCE : SAND/SHALE Cx13 To Cx3 11

12 DVP/VP : BLUE = WATER; RED = GAS IN OIL Water swept reservoir Cx13 Gas exsolution in reservoir To Cx3 12

13 DVP/VP ON PSEUDO IMPEDENCE Cx13 To Cx3 Non produced reservoirs Cx3 & Cx8 13

14 3D VIEW OF PICKED BODIES ON DV/V DAL710 DAL713 DAL729 DAL721 DAL708 Bodies were propagated for each well, for each injected level, on dv/v attribute from Squirm warping on Full Processing. Red: water in water bodies. Others: all are water in oil bodies. Cx12 AE map Cx12 top isochron. 14

15 DAL726 PLT VS. 4D UMC DAL725 DAL706 DAL726 C2BL 36% DAL715 DAL728 DAL719 DAL730 C1 B2 B1 A2/A3 27 % 16 % 11 % 10 % Pseudo impedance difference filtered B2 spill C2BL A3 res A0 res Fast track interpretation performed on Morpheus processing (preliminary) Fairly good agreement between PLT and 4D effects 15

16 FIT OF RESERVOIR MODEL AND 4D RESULTS 4D FT 2010 dvp/vp over Cx13A AE Reservoir model Polymer concentration map 16

17 SAMPLING WELL RESULTS Objectives 4D FT 2010 dvp/vp over Cx13A AE Viscosified water sampling (water injected in DAL713) to measure viscosity, concentration, and salinity SideTrack 2 SideTrack 1 MDT sampling, Bottom hole sampling, Well later converted to a Producer Cx8 and Cx3 Challenging Operations DAL713 WI Sampling well Well was side-tracked (cased hole) after MDT water sampling. Two Side Tracks due to clay instabilities Side Track 2 completion is now in place. Prod well Entry point in Cx13A reservoir Base SideTrack2 Top DAL713-4WI Viscosified water sampling MDT samples July 2011 Collected from Cx13A / Cx13B and Cx12A Presence of polymer confirmed in expected concentration, Inconclusive viscosity results BHS samples (side track 2) Delayed to July 2012 because of operational issues on well completion Viscosity in line with expectation Producer for Cx3 & Cx8 Very good oil bearing sand intersected at the base 17

18 CONCLUSIONS The sampler well is a success Sampling of polymer in the swept area Producer well for bottom reservoirs Thank to 4D seismic we have been able : To prognose the extension of water To update reservoir model for fitting 4D To detect unproduced layers Extension of polymer injection to the entire field is planned for 2014 This is a full multidisciplinary work 18

19 THANK YOU for your attention 19