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It does not require new data acquisition at well site and makes use of historical dynamic data records, usually few months or longer.
Motivation
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Production rate in producing well depends on its productivity index , current formation pressure and current BHP LaTeX Math Inline |
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body | --uriencoded--p_%7Bwf%7D |
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:
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q_1^{\uparrow}(t)=J \cdot \left( p_e(t) - p_{wf}(t) \right) |
and as such depends on completion/lift settings (defining LaTeX Math Inline |
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body | --uriencoded--p_%7Bwf%7D(t) |
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) and how formation pressure is maintained over time.
It keeps declining due to the offtakes:
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p_e(t) = p_e[q_1^{\uparrow}(t), q_2^{\uparrow}(t), q_3^{\uparrow}(t), \dots] |
and maintained by either aquifer or Fluid Injection and in the latter case depends on injection rates:
LaTeX Math Block |
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anchor | pedown |
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alignment | left |
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p_e(t) = p_e[q_1^{\downarrow}(t),q_2^{\downarrow}(t),q_3^{\downarrow}(t),\dots ] |
The combination of LaTeX Math Block Reference |
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, LaTeX Math Block Reference |
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and LaTeX Math Block Reference |
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lead to the correlation between production rates, injection rates and bottomhole pressure variation.
The ultimate purpose of MRT is to extract maximum information from correlation between the long-term (few months or longer) flowrate history and BHP history (recorded by PDG).
It all start with understanding is essentially based on the fact that BHP in a given well given well (whether producing or injecting) responds to flowrate variation in the same well and may (or may not) respond to flowrate variation in offset wells.
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- Create short-term prediction model on production response to various multi-well production regimes
- Compare the well dynamics and and cross-well connectivity with expectations and identify the candidates for drilling, workover or additional well surveillance
- Assess dynamic reservoir properties
Outputs
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Production History |
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Simulated BHP history, LaTeX Math Inline |
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body | --uriencoded--p_%7Bwf%7D(t) |
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Simulated formation pressure history, |
Simulated Productivity Index history, |
Simulated Cross-well interference history, LaTeX Math Inline |
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body | --uriencoded--p_%7Bk \rightarrow m%7D(t) |
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Production Forecast |
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| Rate forecast under Pressure Control regime, LaTeX Math Inline |
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body | --uriencoded--p_k(t), \%7B q_m(t) \%7D \rightarrow q_k(t) |
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BHP forecast under Liquid Control regime, LaTeX Math Inline |
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body | --uriencoded--\%7B q_m(t) \%7D \rightarrow p_%7Bwf, \, k%7D(t) |
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Formation pressure forecast under Liquid Control regime, LaTeX Math Inline |
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body | --uriencoded--\%7B q_m(t) \%7D \rightarrow p_%7Be, \, k%7D(t) |
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Diagnostic Metrics |
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| Cross-well interference map |
Unit-rate Transient Response Matrix (UTRM) |
Unit-rate Transient Response Spider (UTRS) |
Material Balance Pressure Plot |
Inflow Performance Relationship (IPR) |
Cumulative Productivity Plot (Hall Plot) |
J-plots |
WOR diagnostics |
GOR diagnostics |
Primary Well & Reservoir properties |
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| Potential drainage volume |
Current dynamic drainage volume |
Secondary Well & Reservoir properties |
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| Apparent transmissibility |
Apparent skin-factor |
Fracture half-length |
Dynamic fracture pressure threshold |
Inputs
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