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LaTeX Math Block | ||||
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q_1^{\uparrow}(t)=J \cdot \left( p_e(t) - p_{wf}(t) \right) |
and as such depends on on lift settings on completion/lift settings (defining
) and how formation pressure is maintained LaTeX Math Inline body --uriencoded--p_%7Bwf%7D(t)
over time. LaTeX Math Inline body p_e = p_e(t)
It keeps declining due to to the offtakes:
LaTeX Math Block | ||||
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p_e(t) = p_e[q_1^{\uparrow}(t), q_2^{\uparrow}(t), q_3^{\uparrow}(t), \dots] |
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The combination of
, LaTeX Math Block Reference anchor qup
and LaTeX Math Block Reference anchor peup
lead to the correlation between production raterates, injection rates and bottomhole pressure variation. LaTeX Math Block Reference anchor pedown
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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 total subsurface flowrate history,
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Simulated BHP history,
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Simulated formation pressure history,
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Simulated Productivity Index history,
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Simulated Cross-well interference history,
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Production Forecast | |||||
Rate forecast under Pressure Control regime,
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BHP forecast under Liquid Control regime,
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Formation pressure forecast under Liquid Control regime,
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Diagnostic Metrics | |||||
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 | |||||
Potential drainage volume | |||||
Current dynamic drainage volume | |||||
Secondary Well & Reservoir properties | |||||
Apparent transmissibility | |||||
Apparent skin-factor | |||||
Fracture half-length | |||||
Dynamic fracture pressure threshold |
Inputs
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Primary Inputs | |
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PVT model | |
Production/injection history for all wells in a test | |
Bottom-hole pressure (BHP) history for at least one well | |
Additional Inputs | |
Well locations map | |
Well schematic | |
Surface Well Tests | |
Production Logging Reports | |
Cased-Hole Pressure Transient Test Reports | |
SGS – Static Gradient Survey Reports | |
Well Intervention History |
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