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Mechanical Expansion of Steel Tubing as a Solution to Leaky Wellbores
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Improving stopping construction to minimize leakage.

Roy H Grau1, Andrew L Mazzella1, Anu L Martikainen1

  • 1Office of Mine Safety and Health Research (OMSHR), National Institute for Occupational Safety and Health (NIOSH) Pittsburgh.

Journal of the Mine Ventilation Society of South Africa. Mine Ventilation Society of South Africa
|September 18, 2015
PubMed
Summary
This summary is machine-generated.

Proper sealing of mine stoppings is crucial for reducing ventilation leakage and ensuring safe working conditions. This study found that minimizing air leakage through stoppings, perimeters, and coalbeds is achievable with effective sealing techniques.

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Area of Science:

  • Mining Engineering
  • Occupational Safety and Health
  • Ventilation Systems

Background:

  • Mine stoppings are critical for controlling airflow between intake and return airways.
  • Improperly sealed stoppings lead to significant ventilation leakage, compromising mine safety and air quality.
  • Understanding total leakage pathways is essential for effective mine ventilation design.

Purpose of the Study:

  • To investigate total air leakage through mine stoppings, including the stopping material, perimeter, and surrounding coalbed.
  • To evaluate sealing strategies for stoppings, particularly those under roof control screens.
  • To assess the impact of construction materials, like wooden wedges, on sealant application and effectiveness.

Main Methods:

  • Constructed a test stopping in a dead-end mine room at the NIOSH Safety Research Coal Mine.
  • Pressurized the room with compressed air to simulate mine conditions.
  • Measured air pressure loss to quantify stopping leakage.
  • Utilized a soap solution to visually detect air leakage via bubble formation.

Main Results:

  • Air leakage occurs not only through the stopping but also at the perimeter and through the coalbed.
  • Wooden wedges can impede the efficient application of polyurethane foam sealant.
  • Leakage through the surrounding coal strata was observed and quantified.
  • Proper sealing techniques were demonstrated to significantly minimize overall stopping leakage.

Conclusions:

  • Effective sealing of stoppings is paramount for reducing ventilation losses in underground mines.
  • Attention must be paid to sealing the perimeter and surrounding strata, not just the stopping material itself.
  • Optimized construction and sealing methods are necessary to enhance mine safety and ventilation efficiency.