Radius of Investigation for Flow Time Formula |
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\( r_i \;=\; \left( \mu \cdot \dfrac{ t }{ 948 \cdot n \cdot \eta \cdot \beta } \right)^{0.5} \) (Radius of Investigation for Flow Time) \( \mu \;=\; \dfrac{ 948 \cdot r_i^2 \cdot n \cdot \eta \cdot \beta }{ t } \) \( t \;=\; \dfrac{ 948 \cdot r_i^2 \cdot n \cdot \eta \cdot \beta }{ \mu } \) \( n \;=\; \dfrac{ \mu \cdot t }{ 948 \cdot r_i^2 \cdot \eta \cdot \beta } \) \( \eta \;=\; \dfrac{ \mu \cdot t }{ 948 \cdot r_i^2 \cdot n \cdot \beta } \) \( \beta \;=\; \dfrac{ \mu \cdot t }{ 948 \cdot r_i^2 \cdot n \cdot \eta } \) |
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| Symbol | English | Metric |
| \( r_i \) = Radius of Investigation at the End of Injection Time |
- | \(m\) |
| \( \mu \) (Greek symbol mu) = Permability | - | \(mD\) |
| \( t \) = Time | - | \(h\) |
| \( n \) = Porosity | - | \(dimensionless\) |
| \( \eta \) (Greek symbol eta) = Oil Viscosity | - | \(cP\) |
| \( \beta \) (Greek symbol beta) = Total Compressibility (1/psi) | - | \(Pa\) |
Radius of investigation is used in reservoir engineering and well testing that estimates the maximum radial distance from a wellbore where a pressure disturbance from production or injection has been detected over a given flow time. It is commonly used to understand the extent of the reservoir affected by the operation within a certain time frame.
