Analytical solutions for gas flow due to gas injection and extraction from horizontal wells

Journal Article · Wed Mar 01 04:00:00 EST 1995 · Ground Water

DOI:https://doi.org/10.1111/j.1745-6584.1995.tb00278.x· OSTI ID:31791

Falta, R W ^[1]

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1. Clemson Univ., SC (United States). Dept. of Earth Sciences

Soil vapor extraction is a popular method for removing volatile organic contaminants from the unsaturated zone. A soil vapor extraction system consists of one or more pumping wells screened in the unsaturated zone. These wells may have either a vertical or a horizontal configuration, and additional wells may be used for gas injection. Contaminant removal is achieved as the induced gas flow sweeps the contaminated zone, flushing contaminant vapors from the soil. Analytical solutions are developed for modeling the transient and steady-state gas pressure and the steady-state streamfunction fields resulting from gas injection and extraction from a pair of parallel horizontal wells. These solutions apply to cases in which the ground surface is open to the atmosphere, and in which the porous media ia anisotropic but homogeneous. By neglecting end effects due to the finite length of the wells, the three-dimensional gas flow field is approximated as a two-dimensional cross section perpendicular to the wells. These solutions may be used to develop estimates of the horizontal well system behavior and to analyze horizontal well gas pump tests, and are useful for numerical model verification.

• Sponsoring Organization: USDOE
• OSTI ID: 31791
• Journal Information: Ground Water, Journal Name: Ground Water Journal Issue: 2 Vol. 33; ISSN GRWAAP; ISSN 0017-467X
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
DECONTAMINATION
ENVIRONMENTAL TRANSPORT
GROUND WATER
MATHEMATICAL MODELS
ORGANIC COMPOUNDS
REMEDIAL ACTION
SOILS
TECHNOLOGY ASSESSMENT