NIOSH Gas Well Stability Research: A Summary of Ground Control Engineering Considerations

Details

• Personal Author:
  Kim B ; Su D ; Tulu B ; Zhang P
• Description:
  This paper summarizes significant findings from the ongoing NIOSH Gas Well Stability research over the past decade; in particular, the important ground control engineering considerations. Longwall-induced surface and subsurface deformations may induce gas well casing deformations and stresses, depending on a few parameters such as overburden depth, overburden geology, topographic relief, strata dip, gas well setback distance, and a gas well casing cementing alternative. Overburden depth to the mining seam is one of the most influential factors; shallow overburden depth induces large horizontal displacement and resulting casing deformation and stress, while deep overburden depth induces large longwall-induced vertical pressure. Overburden geology is another important factor affecting the longwall-induced casing deformations and stresses; the large contrast of bending stiffness at the soft-to-hard rock interfaces tends to induce large casing deformations and stresses. Large surface topographic relief and the presence of soft-to-hard rock interfaces below the stream valley bottoms may shift longwall-induced subsurface gas well casing deformations closer to the surface, thus having less impact on underground mining operations. Strata dip magnifies longwall-induced deformations by 20% per degree of strata dip for down dip longwall excavations. The gas well setback distance is also a critical geometric parameter; the effect of longwall-induced deformation decreases exponentially as the setback distance increases. Longwall-induced casing deformation and stress will be mitigated or totally uncoupled for uncemented production casing. [Description provided by NIOSH]
• Subjects:
  Occupational Health Safety
• Keywords:
  Geologic Strata Geotechnical Engineering Ground Control Longwall Mining Mining Engineering
• Series:
  Mining Publications
• ISBN:
  97808733551
• Publisher:
  Society for Mining, Metallurgy & Exploration (SME)
• Document Type:
  Text
• Genre:
  Proceedings
• Place as Subject:
  OSHA Region 10 ; OSHA Region 3 ; Pennsylvania ; Washington
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  PMRD - Pittsburgh Mining Research Division ; SMRD - Spokane Mining Research Division
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  198-205
• NIOSHTIC Number:
  nn:20070529
• Citation:
  Proceedings of the 43rd International Conference on Ground Control in Mining (ICGCM 2024), July 22-25, 2024, Canonsburg, Pennsylvania. Klemetti T, Mitra R, Perry K, Murphy M, Tulu IB, eds. Englewood, CO: Society for Mining, Metallurgy & Exploration (SME), 2024 Jul; :198-205
• Editor(s):
  Klemetti T; Mitra R; Perry K; Murphy M; Tulu IB
• Federal Fiscal Year:
  2024
• Peer Reviewed:
  False
• Source Full Name:
  Proceedings of the 43rd International Conference on Ground Control in Mining (ICGCM 2024), July 22-25, 2024, Canonsburg, Pennsylvania
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:9e52a434c861cce5c17dfa042d83d5b86363841f924aa383de31718a117c69fafe667c6c3b9c1bdf1b128d2f1f764c65bac87ce95ada6e1f7145b4367e9f004a
• Download URL:
  https://stacks.cdc.gov/view/cdc/215720/cdc_215720_DS1.pdf
• File Type:
  [PDF - 1.82 MB ]