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|a (JST)23804972
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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1 |
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|a Ingraffea, Anthony R.
|e verfasserin
|4 aut
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| 245 |
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|a Assessment and risk analysis of casing and cement impairment in oil and gas wells in Pennsylvania, 2000—2012
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|c 2014
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|a Text
|b txt
|2 rdacontent
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|a Computermedien
|b c
|2 rdamedia
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|a Online-Ressource
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|a Casing and cement impairment in oil and gas wells can lead to methane migration into the atmosphere and/or into underground sources of drinking water. An analysis of 75,505 compliance reports for 41,381 conventional and unconventional oil and gas wells in Pennsylvania drilled from January 1, 2000—December 31, 2012, was performed with the objective of determining complete and accurate statistics of casing and cement impairment. Statewide data show a sixfold higher incidence of cement and/or casing issues for shale gas wells relative to conventional wells. The Cox proportional hazards model was used to estimate risk of impairment based on existing data. The model identified both temporal and geographic differences in risk. For post-2009 drilled wells, risk of a cement/casing impairment is 1.57-fold [95% confidence interval (CI) (1.45, 1.67); P < 0.0001] higher in an unconventional gas well relative to a conventional well drilled within the same time period. Temporal differences between well types were also observed and may reflect more thorough inspections and greater emphasis on finding well leaks, more detailed note taking in the available inspection reports, or real changes in rates of structural integrity loss due to rushed development or other unknown factors. Unconventional gas wells in northeastern (NE) Pennsylvania are at a 2.7-fold higher risk relative to the conventional wells in the same area. The predicted cumulative risk for all wells (unconventional and conventional) in the NE region is 8.5-fold [95% CI (7.16, 10.18); P < 0.0001] greater than that of wells drilled in the rest of the state.
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|a copyright © 1993—2008 National Academy of Sciences of the United States of America
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| 650 |
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4 |
|a Business
|x Industry
|x Industrial sectors
|x Extractive industries
|x Mining industries
|x Natural gas production
|x Gas fields
|x Gas wells
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| 650 |
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4 |
|a Applied sciences
|x Materials science
|x Materials
|x Composite materials
|x Cements
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| 650 |
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4 |
|a Applied sciences
|x Engineering
|x Energy engineering
|x Fuels
|x Fossil fuels
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| 650 |
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4 |
|a Physical sciences
|x Chemistry
|x Chemical compounds
|x Chemicals
|x Methane
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| 650 |
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4 |
|a Biological sciences
|x Ecology
|x Applied ecology
|x Environmental management
|x Natural resource management
|x Water management
|x Water distribution
|x Water supply systems
|x Water wells
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| 650 |
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4 |
|a Business
|x Business economics
|x Commercial production
|x Production engineering
|x Quality management
|x Quality analysis
|x Inspection reports
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| 650 |
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4 |
|a Business
|x Industry
|x Industrial sectors
|x Extractive industries
|x Mining industries
|x Oil production
|x Oil fields
|x Observation wells
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| 650 |
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4 |
|a Physical sciences
|x Earth sciences
|x Geography
|x Geomorphology
|x Rocks
|x Sedimentary rocks
|x Clastic sedimentary rocks
|x Mudrocks
|x Shales
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| 650 |
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4 |
|a Physical sciences
|x Earth sciences
|x Geography
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| 650 |
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4 |
|a Applied sciences
|x Materials science
|x Materials processing
|x Drilling
|x SEE COMMENTARY
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| 655 |
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4 |
|a research-article
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| 700 |
1 |
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|a Wells, Martin T.
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Santoro, Renee L.
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Shonkoff, Seth B. C.
|e verfasserin
|4 aut
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| 773 |
0 |
8 |
|i Enthalten in
|t Proceedings of the National Academy of Sciences of the United States of America
|d National Academy of Sciences of the United States of America
|g 111(2014), 30, Seite 10955-10960
|w (DE-627)254235379
|w (DE-600)1461794-8
|x 10916490
|7 nnns
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| 773 |
1 |
8 |
|g volume:111
|g year:2014
|g number:30
|g pages:10955-10960
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|u https://www.jstor.org/stable/23804972
|3 Volltext
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|d 111
|j 2014
|e 30
|h 10955-10960
|