Production EngineeringHydraulic Fracturing

Filter-Cake Fluid-Loss Velocity - Acidizing Formula

v_N=\frac{C_w}{\sqrt{t}}

Filter-Cake Fluid-Loss Velocity - Acidizing calculates fluid loss velocity for hydraulic fracturing workflows in production engineering.

Calculate

How engineers use this formula

Use this formula when the listed inputs (C_w, sqrt_t) are known and the assumptions behind the cited hydraulic fracturing relationship match the engineering case being checked.

Assumptions

Input values are representative for the well, reservoir, fluid, or equipment case being evaluated.
The declared units match the field-unit constants used in the formula.
The cited formula applies to the selected petroleum engineering workflow.

Limitations

The calculation does not replace a full engineering model or operating procedure.
Accuracy depends on the source correlation, assumptions, input quality, and unit consistency.

Common mistakes

Mixing unit systems without converting the inputs.
Using default example values as field recommendations.
Applying the formula outside the source assumptions.

Default example

Using the default inputs, v_N equals 0.000005 m/s.

C_wm/s^0.5

0.0001

sqrt_ts^0.5

Inputs

C_w

m/s^0.5

Fluid Loss Coefficient

sqrt_t

s^0.5

Square Root of Time

Outputs

v_N

m/s

Fluid Loss Velocity

C_w

m/s^0.5

Fluid Loss Coefficient

sqrt_t

s^0.5

Square Root of Time

Source and review

reviewed

Williams, B.B., Gidley, J.L. and Schechter, R.S. 1979. Acidizing Fundamentals. Henry L. Doherty Memorial Fund of AIME, Society of Petroleum Engineers of AIME, Page 41.

Source