Transcript Document
Oil Field Manager ~ Presentation OFM helps engineers manage more wells effectively in less time 6 July 2015 Data Organisation in OFM All data stored in relational database. Since OFM 2000, OFM uses Microsoft Access for data storage. Links to other databases possible via ODBC: Permanent download to Access. Live link to external database (no data duplication). External Database 2 OFM Access DB Data Input Levels in OFM Master Table is used to set the project key. Corresponds to the lowest level at which data is available (usually either Completion or Wellbore). Other well information may be included (well coordinates etc). Field Wellbore Completion Completion 3 Base Map 4 Base Map 5 Filtering Capabilities In OFM 6 Sample Production Plots 7 Sample Production Plots 8 Sample Production Plots 9 Basic Production Plot Cum Gas = 2.992 ( Bcf ) Cum Oil = 604.621 ( Mbbl ) Cum Water = 115.114 ( Mbbl ) •Productivity decrease drastically as soon as the water hit the well: •AL?, Emulsion problems? Scale? Fines migration? Unocal - Basic Production Plot #1 160001177110038801S01 Flowunit = BU1 6 RD E006 160001177110038801S01 Oil Rate (Cal. Day) ( bbl/d ) 500 400 Water Rate (Cal. Day) ( bbl/d ) 300 Liquid Rate (Cal. Day) ( bbl/d ) 200 100 0 1976 77 78 79 80 81 82 83 84 85 86 87 88 89 90 Axis 1 Water Cut ( % ) 160001177110038801S01 75 200 Axis 2 60 160 Gas Oil Ratio ( Mcf/bbl ) 160001177110038801S01 45 120 30 80 15 40 0 0 1976 77 78 79 80 81 82 83 84 85 86 87 88 89 90 82 83 84 85 86 87 88 89 90 160001177110038801S01 Cumulative Oil Production ( Mbbl ) 3000 2400 Cumulative Gas Production ( MMcf ) 1800 Cumulative Water Production ( Mbbl ) 1200 600 0 1976 10 77 78 79 80 81 DCA in OFM 11 Bubble Maps In OFM ~ Monthly Production 12 Sample Bubble Maps 13 Sample Bubble Maps 14 Sample Bubble Maps 15 Sample Bubble Maps Lesson 3.4 16 Sample Bubble Maps Sample Bubble Maps 17 Sample Bubble Maps 18 Sample Bubble Maps 19 OOIP and grid map in OFM OFM can calculate the original-oil/gas-in-place for reservoirs. This technique uses the volumetric equation and grid arithmetic. N= 20 A * h( gridmap) * f ( gridmap) * (1 - Swi)( gridmap) Boi OOIP and grid map in OFM 21 OOIP and grid map in OFM * * = Boi 22 Normalized Mapping – (OOIP-Np) Map Area of low recovery efficiency – workover potential exist? Area of over recovery efficiency – Potential additional pay presents ? 23 Basic Production Maps Best gas well 24 Zones with very low recovery of gas -Undrained zones? -Potential for new wells? -Stimulation opportunities? Production Heterogeneity Index • Heterogeneity indexing is - valuewell HI = -1 valueaverage of wells Comparing individual wells to the average of a well group A fast way to identify over- and underperforming wells, best completion practices etc. 25 Desired results and interpretation 26 Re - perforation Analysis Due to different perforation techniques, some wells experienced problems Underbalanced perforating (through tubing) may not have achieved full penetration Cumulative liquid produced per perf foot is a technique to evaluate perforation productivity Grid map/bubble map results 27 Damage Indicator Formation damage analysis Simple damage analysis Formation Damage Index (FDI) FDI = q = kh 0.007078p re o Bo ln s rw Grid map Pressure transient is preferred for 28 calculating skin Treatment = acidize well to remove damage Decline Curve Analyses Equations Exponential Decline Conversions (where b = 0) qi q t = Di t e Hyperbolic Decline Conversions (where 0 < b < 1) qi qt = 1 bDit 1 b Harmonic Decline Conversions (where b = 1) qi qt = 1 Dit 29 DCA in OFM Potential zones with high Reserves 30 Volumetric Drainage Radius Estimation Visual representation of the drainage area per well in the reservoir. Areas not being drained by wells are quickly identified visually with bubble mapping 31 Technical Discussion Volumetric Drainage radius (rev) calculation Literally, the volume occupied by the produced fluid at reservoir conditions Assume uniform pressure reservoir Volumetric method 5.615 N B rev = p oi h f (1 - S w - S or ) ft Drainage radius for Np and EUR Additional variable can be displayed with drainage radius to provide insight of reservoir performance 32 Volumetric Drainage Radius Example Undeveloped spots Drainage Radius at Np 33 Drainage Radius at EUR