Definition
Primary Production Analysis is the specific workflow and report template on Primary Well & Reservoir Performance Indicators.
Application
- assess current production distribution
- assess current distribution of recovery against expectations
- assess current status and trends of recovery against expectations
- assess current status and trends of reservoir depletion against expectations
- assess current status and trends of water flood efficiency against expectations
- quantitatively compare performance of different wells or different groups of wells
- identify and prioritize redevelopment opportunities
Technology
Primary Production Analysis is built around production data against material balance and require current FDP volumetrics, PVT and SCAL models.
It includes well-by-well diagnostics and gross field diagnostics, but may be extended to sector-by-sector diagnostics.
Metrics
Primary Production Analysis includes the following metrics:
Metric name | Diagnostic plots | Objectives | |
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1 | Production History Map | Background = Structure Bubbles = qo, qg , qw, qinj Number = CurVRR, Pe | Production Distribution Overview |
2 | Recovery Map | Background = STOIIP Bubbles = Qo, Qg , Qw, Qinj Number = CumVRR, Pe | Recovery Distribution Overview |
3 | Cross-section | Background = STOIIP & Structure Bubbles = VRR Number = Pe , Pem | |
3 | Production History Graphs | Left Axis = qo, qg , qw, qinj, Rigth Axis = Yw, GOR, Pe , Np, Ninj Hor Axis = Elapsed Time | Production History Overview |
4 | Decline Curve Analysis | Left Axis = qo1, qliq1, qinj1, Rigth Axis = Yw, GOR, VRR, Pe Hor Axis = Elapsed Time | Production Forecast |
5 | Recovery Diagnostic | Left Axis = qo1, qliq1, qinj1 Rigth Axis =Yw, GOR, VRR, Pe, Pem Hor Axis = RF | Estimate recovery efficiency and pressure decline |
6 | Watercut Diagnostic | Left Axis = Yw, Ywm Hor Axis = qliq | Check for water balance and thief water production |
7 | GOR Diagnostic | Left Axis = GOR, GORgm Hor Axis =qo | Check for gas balance and thief gas production |
8 | Injection Efficiency Diagnostics | Left Axis = PIR , PIRm Hor Axis = Yw | Evaluate WI efficiency |
9 | Well Performance Analysis | Left Axis = Pwf_IPR , Pwf_VLP Hor Axis = qo | Check for the optimal production/injection target |
10 | Productivity Index Diagnostic | Left Axis = JPI, JPIm Hor Axis = dP = Pwf - Pe | Check for PI dynamics |
Below is the list of the production properties involved in the above metrics.
Property Abbrevy | Property Name | Formula | ||||
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VRRcum | Cumulative Voidage Replacement Ratio |
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VRRcur | Current Voidage Replacement Ratio (month over month) |
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RF | Recovery Factor |
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Yw | Watercut (production) |
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Ywm | Watercut (proxy-model) |
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GOR | Gas-Oil Ratio (production) |
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GOR_m | Gas-Oil Ratio (proxy-model) |
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qLIQ | Liquid rate |
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PIR | Production Injection Ratio (production) |
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PIRm | Production Injection Ratio (model) |
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JO | Oil Productivity Index |
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JPI | Total Productivity Index (production) |
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JPIm | Total Productivity Index (model) |
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Diagnostic
Sample Case 1 – Sector Analysis
Fig. 1. Production History Map | Fig. 2. Recovery Map | Fig. 3. Cross-section & PLT, permeability, GOC, OWC |
Fig. 4. Production History Graphs | Fig. 5. Decline Curve Analysis | Fig. 6. Recovery Diagnostic |
Fig. 7. Watercut Diagnostic | Fig. 8. GOR Diagnostic | Fig. 9. Injection Efficiency Diagnostics |
Fig. 10. Well Performance Analysis (VFP + IPR) | Fig. 11. Productivity Index Diagnostic | Fig. 12. Well Completion & PLT |
Sample Case 2 – Producer Analysis
Fig. 1. Production History Map | Fig. 2. Recovery Map | Fig. 3. Cross-section & PLT |
Fig. 4. Production History Graphs | Fig. 5. Decline Curve Analysis | Fig. 6. Recovery Diagnostic |
Fig. 7. Watercut Diagnostic | Fig. 8. GOR Diagnostic | Fig. 9. Injection Efficiency Diagnostics |
Fig. 10. Well Performance Analysis (VFP + IPR) | Fig. 11. Productivity Index Diagnostic | Fig. 12. Well Completion & PLT |
Sample Case 3 – Injector Analysis
Fig. 1. Production History Map | Fig. 2. Recovery Map | Fig. 3. Cross-section & PLT |
Fig. 4. Production History Graphs | ||
Fig. 10. Well Performance Analysis (VFP + IPR) | Fig. 11. Injectivity Index Diagnostic | Fig. 12. Well Completion & PLT |