Daviau et al. Solution for Horizontal Wells

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Daviau et al. Solution for Horizontal Wells in Confined Aquifers

Description

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 confined aquifers. Analysis involves matching the Daviau et al. solution to water-level displacement 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 software promotes rapid and accurate determination of aquifer properties.

Assumptions

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

	aquifer has infinite areal extent
	aquifer is homogeneous, isotropic and of uniform thickness
	potentiometric surface is initially horizontal
	aquifer is 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. solution:

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

Benchmark

Comparison of AQTESOLV (blue curve) and published data from Clonts and Ramey (1986) for uniform-flux horizontal well (symbols).

References

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

Clonts, M.D. and H.J. Ramey, Jr., 1986. Pressure transient analysis for well with horizontal drainholes, SPE Paper 15116, presented at the 56th California Regional Meeting, Oakland, CA, April 2-4, 1986.

Ozkan, E., Raghavan, R. and S.D. Joshi, 1989. Horizontal-well pressure analysis, SPE Formation Evaluation (December 1989), pp. 567-575.