**Description**

Dimensionless radius

**Excel Function Syntax**

ptaRwd(r, rw)

**Online Calculator**

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**Description**

Dimensionless radius

**Excel Function Syntax**

ptaRwd(r, rw)

**Online Calculator**

ptaPd

Dimensionless pressure as defined for constant-rate production

ptaTd

Dimensionless time

ptaLd

Dimensionless distance

ptaCd

Dimensionless wellbore storage coefficient

PdLSSIHR

The expression of dimensionless line source solution pressure of infinite homogeneous reservoir.

PdwVWIHR

Dimensionless wellbore pressure drop for vertical well in infinite homogenous reservoir.

PdwVWIHRLSFB

Dimensionless wellbore pressure drop for vertical well in infinite homogenous reservoir with linear sealing fault boundary.

PdwVWIHRLCPB

Dimensionless wellbore pressure drop for vertical well in infinite homogenous reservoir with linear constant pressure boundary.

PdwVWIHRPSFB

Dimensionless wellbore pressure drop for vertical well in infinite homogenous reservoir with perpendicular sealing faults boundary.

PdwVWIHRPCPB

Dimensionless wellbore pressure drop for vertical well in infinite homogenous reservoir with perpendicular constant pressures boundary.

PdwVWIHRPMB

Dimensionless wellbore pressure drop for vertical well in infinite homogenous reservoir with perpendicular mixed boundaries (boundary 1 – fault, boundary 2 – constant pressure).

PwVWIHR

Wellbore pressure drop for vertical well in infinite homogenous reservoir, [psi]

PwVWIHRLSFB

Wellbore pressure drop for vertical well in infinite homogenous reservoir with linear sealing fault boundary, [psi]

PwVWIHRLCPB

Wellbore pressure drop for vertical well in infinite homogenous reservoir with linear constant pressure boundary, [psi]

PwVWIHRPSFB

Wellbore pressure drop for vertical well in infinite homogenous reservoir with perpendicular sealing faults boundary, [psi]

PwVWIHRPCPB

Wellbore pressure drop for vertical well in infinite homogenous reservoir with perpendicular constant pressures boundary, [psi]

PwVWIHRPMB

Wellbore pressure drop for vertical well in infinite homogenous reservoir with perpendicular mixed boundaries (boundary 1 – fault, boundary 2 – constant pressure), [psi]

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