Buildup Pressure for Liquid Flow
Drilling buildup pressure for liquid flow is the increase in pressure observed in a wellbore or reservoir during the buildup phase of a well test. This occurs when production or flow is stopped, allowing the reservoir pressure to stabilize and recover. The buildup pressure is critical for evaluating reservoir characteristics and determining the flow behavior of the liquid (oil, water, or brine) in the reservoir.
Buildup Pressure for Liquid Flow Formula |
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| \( p_b \;=\; \dfrac{ k \cdot h \cdot ( \rho_i - \rho_{ws} ) }{ 0.4568 \cdot v \cdot q \cdot B \cdot \eta } \) | ||
| Symbol | English | Metric |
| \( p_b \) = Buildup Pressure |
- | \(dimensionless \;pressure\) |
| \( k \) = Effective Permability of Flowing Phase | - | \(d\) |
| \( h \) = Net Formation Thickness | - | \(m\) |
| \( \rho_i \) (Greek symbol rho) = Initial Reservoir Pressure (psi) | - | \(Pa\) |
| \( \rho_{ws} \) (Greek symbol rho) = Shut in Pressure (psi) | - | \(Pa\) |
| \( v \) = Specific Volume at Standard Conditions | - | \(cc \;/\; g\) |
| \( q \) = Production Rate | - | \(tons \;/\; hr\) |
| \( B \) = Formation Volume Factor (Reservoir Volume/Standard Volume) | - | \(m^3\) |
| \( \eta \) (Greek symbol eta) = Flowing Fluid Viscosity | - | \(cP\) |
