Difference between revisions of "Prats effective well radius"
From wiki.pengtools.com
(→Skin equation for fractured wells) |
|||
| Line 13: | Line 13: | ||
===Skin equation for fractured wells=== | ===Skin equation for fractured wells=== | ||
| + | |||
| + | For high conductivity fracture: | ||
| + | :<math>r_{w_{eff}} = \frac{X_f}{2}</math> | ||
| + | |||
| + | and | ||
:<math>S = ln \left ( \frac{r_w}{r_{w_{eff}}} \right ) = ln \left ( \frac{2 r_w}{X_f} \right )</math> | :<math>S = ln \left ( \frac{r_w}{r_{w_{eff}}} \right ) = ln \left ( \frac{2 r_w}{X_f} \right )</math> | ||
Latest revision as of 06:39, 28 April 2020
Contents
Prats effective well radius equation
Effective well radius is a radius value at which well is draining the reservoir under the radial flow conditions.
- For stimulated wells the effective well radius is higher than the wellbore radius.
- For damaged wells the effective well radius is lower than the wellbore radius.
- For undamaged wells the effective well radius is equal to the wellbore radius.
It appears that the behavior of vertically fractured reservoirs can be interpreted in terms of simple radial-flow reservoirs of large wellbore.— Prats, 1961
Skin equation for fractured wells
For high conductivity fracture:
and
Nomenclature
= wellbore radius, length
= effective well radius, length
= skin factor, dimensionless
= fracture half length, length
References
- Prats, M., Hazebroek, P., and Strickler, W.R. 1962. Effect of Vertical Fractures on Reservoir Behavior--Compressible-Fluid Case. SPE J. 2 (2): 87-94.
