Migration of high-pressure air during gas well drilling in the appalachian basin

Xiaolong Geng, Nicholas C. Davatzes, Daniel J. Soeder, Jagadish Torlapati, Rebecca S. Rodriguez, Michel Boufadel

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

We present the details of a numerical model simulating the migration of pressurized air used for pneumatic drilling of a well in an aquifer. We used an incident that occurred in West Virginia during June 2012 as a basis for making the simulations realistic. We developed a 3D conceptual model using the multipurpose model TOUGH2 to simulate the events during this incident. Input parameters for the model were obtained from field measurements, and a number of reasonable assumptions were made for other parameters. Our results showed that compressed air from a drilling well is capable of creating a high pressure gradient in groundwater at hundreds of meters from the drill hole, even if the air leakage from the drilling well occurs in a confined aquifer, and even if the leakage duration is only 2 h. Therefore, one way to prevent the pressure buildup in the surrounding aquifers is through emplacement of observation wells before drilling, which would alert the drillers to any unusual pressure buildup inside the confined aquifer. However, air leakage in unconfined aquifers seems to have a much smaller spatial extent (less than tens of meters). Sensitivity analysis revealed that air pressure, fracture permeability, and injection time are critical parameters for the propagation of air.

Original languageEnglish (US)
Article numberB4014002
JournalJournal of Environmental Engineering (United States)
Volume140
Issue number5
DOIs
StatePublished - May 1 2014

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Civil and Structural Engineering
  • Environmental Chemistry
  • Environmental Science(all)

Keywords

  • 3D numerical modeling
  • Air hammer drilling
  • Air migration
  • Fractured aquifer
  • TOUGH2

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