Effects of Longwall-Induced Stress and Deformation on the Stability and Mechanical Integrity of Shale Gas Wells Drilled Through a Longwall Abutment Pillar

Details

• Personal Author:
  Su, Daniel W. H.
• Description:
  This paper presents the results of a comprehensive study conducted by CONSOL Energy, Marcellus Shale Coalition, and Pennsylvania Coal Association to evaluate the effects of longwall-induced subsurface deformations on the mechanical integrity of shale gas wells drilled over a longwall abutment pillar. The primary objective is to demonstrate that a properly constructed gas well in a standard longwall abutment pillar can maintain mechanical integrity during and after mining operations. A study site was selected over a southwestern Pennsylvania coal mine, which extracts 457-m-wide longwall faces under about 183. m of cover. Four test wells and four monitoring wells were drilled and installed over a 38-m by 84-m centers abutment pillar. In addition to the test wells and monitoring wells, surface subsidence measurements and underground coal pillar pressure measurements were conducted as the 457-m-wide longwall panels on the south and north sides of the abutment pillar were mined by. To evaluate the resulting coal protection casing profile and lateral displacement, three separate 60-arm caliper surveys were conducted. This research represents a very important step and initiative to utilize the knowledge and science obtained from mining research to improve miner and public safety as well as the safety and health of the oil and gas industries. [Description provided by NIOSH]
• Subjects:
  Accident Prevention Accidents Environmental Monitoring Mining Occupational Health Oil And Gas Industry Safety
• Keywords:
  Abutment Pillar Accident Prevention Author Keywords: Gas Well Casing Coal Mines Drilling Environmental Monitoring Environmental Stress Gas Industry Geologic Surveys Geotechnical Engineering Ground Stability Instrumentation Longwall Mining Mechanical Properties Testing Numerical Simulation Oil Industry Pressure Testing Room And Pillar Mining Safety And Health Simulation Methods Stability Structural Analysis Subsidence Surface Properties Underground-mining

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• Series:
  Mining Publications
• ISSN:
  2095-2686
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  PMRD - Pittsburgh Mining Research Division
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  115-120
• Volume:
  27
• Issue:
  1
• NIOSHTIC Number:
  nn:20049155
• Citation:
  Int J Min Sci Technol 2017 Jan; 27(1):115-120
• Contact Point Address:
  Daniel W.H. Su, National Institute for Occupational Safety and Health, Pittsburgh, PA 15236
• Email:
  kxz4@cdc.gov
• Federal Fiscal Year:
  2017
• Peer Reviewed:
  True
• Source Full Name:
  International Journal of Mining Science and Technology
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:acbbf424cf1a680dbb922e9892f89b23128d98e0e0887f357d5d382b652c474cd03324b357243f89f382ac06dc20e0d5f48b0a7d289da5c27e021a788bb57171
• Download URL:
  https://stacks.cdc.gov/view/cdc/228330/cdc_228330_DS1.pdf
• File Type:
  [PDF - 2.38 MB ]