NIOSH Gas Well Stability Research: Investigation into the Causes of an Anomalous Shale Gas Well Casing Deformation at a Deep Longwall Mine

Su D; Zhang P

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NIOSH Gas Well Stability Research: Investigation into the Causes of an Anomalous Shale Gas Well Casing Deformation at a Deep Longwall Mine

Public Domain

2024/02/25
By Su D ; Zhang P
Series: Mining Publications

Details

Personal Author:

Su D ; Zhang P
Description:

Following the first longwall excavation at a deep-cover gas well site, the pre-mining modeling prediction of longwall-induced casing deformations in the fully cemented production casing were in excellent agreement with post-mining Caliper survey results. However, after second panel mining, the post-mining Caliper survey revealed a large plastic deformation near the top of the Pittsburgh Seam. The focus of this paper is to identify the possible cause of such an anomalous deformation. Very high longwall-induced casing stress near a thick claystone layer at 23 feet above the Pittsburgh seam horizon was identified as the primary cause. Leaving the production casing uncemented or using softer cementing material between intermediate and production casings is identified as the best practice. [Description provided by NIOSH]
Subjects:

Mining Occupational Health Safety
Keywords:

Geologic Strata Geologic Surveys Longwall Mining Mining Industry Simulation Methods Underground Mines
Series:

Mining Publications
Publisher:

Society for Mining, Metallurgy & Exploration (SME)
Document Type:

Text
Genre:

Proceedings
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:

1-10
NIOSHTIC Number:

nn:20069452
Citation:

MineXchange: 2024 SME Annual Conference & Expo, February 25-28, 2024, Phoenix, Arizona, preprint 24-064. Englewood, CO: Society for Mining, Metallurgy & Exploration, 2024 Feb; :1-10
Federal Fiscal Year:

2024
Peer Reviewed:

False
Source Full Name:

MineXchange: 2024 SME Annual Conference & Expo, February 25-28, 2024, Phoenix, Arizona, preprint 24-064
Collection(s):

National Institute for Occupational Safety and Health
Main Document Checksum:

urn:sha-512:1f828386478920ac4d2d09827cff0e8def03ac74c7c24d960d1f439f8f280d1cdab9ee18cb97386d0daae39f329241eff84c569c24f9bf73e8c2421bef4583f9
Download URL:

https://stacks.cdc.gov/view/cdc/215680/cdc_215680_DS1.pdf
File Type:

[PDF - 3.55 MB ]

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