# Daviau et al. Solution for Horizontal Wells in Confined Aquifers

Related Solution Methods

Additional Topics

A mathematical solution for **horizontal wells** by Daviau et al. (1985) is useful for determining the hydraulic properties (transmissivity, storativity and hydraulic conductivity anisotropy ratio) of **nonleaky confined** aquifers. Analysis involves matching the Daviau et al. solution to drawdown data collected during a pumping test in a horizontal well.

AQTESOLV provides visual and automatic methods for matching the Daviau et al. solution to pumping test data from a horizontal well. This easy-to-use and intuitive pumping test analysis software with advanced solution methods promotes rapid and accurate determination of aquifer properties.

## Assumptions

The following assumptions apply to the use of the Daviau et al. horizontal well solution:

- aquifer has infinite areal extent
- aquifer is homogeneous, isotropic and of uniform thickness
- potentiometric surface is initially horizontal
- aquifer is nonleaky confined
- flow is unsteady
- water is released instantaneously from storage with decline of hydraulic head
- diameter of the horizontal well is very small so that storage in the well can be neglected

## Solution

Options

AQTESOLV provides the following options for the Daviau et al. method for a horizontal well:

- constant or variable pumping rate with recovery
- multiple horizontal wells
- multiple observation wells
- partially penetrating observation wells

## Benchmark

## Example

## References

Daviau, F., Mouronval, G., Bourdarot, G. and P. Curutchet, 1985. Pressure analysis for horizontal wells, SPE Paper 14251, presented at the 60^{th} Annual Technical Conference and Exhibition in Las Vegas, NV, Sept. 22-25, 1985.