Well casing - Revision history

Jmdonev: 1 revision imported

2017-08-29T01:46:50Z

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Jmdonev at 17:05, 28 July 2017

2017-07-28T17:05:34Z

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	[[Category:Done ~~2015~~-10-15]]		[[Category:Done 2017-07-01]]
	<onlyinclude>A '''well casing''' is a lining that is installed in an [[oil well]] once it is drilled and surrounds the well entirely. Casing is typically hollow steel pipe that lines the inside of the wellbore.<ref name="RE2">FracFocus. (October 18, 2015). ''Well Casing'' [Online]. Available: http://fracfocus.org/hydraulic-fracturing-how-it-works/casing</ref> Casings are used to support the well, as the raw sides of the well would collapse in without support.<ref name="RE1">Rigzone. (October 18, 2015). ''Well Casing'' [Online]. Available: http://www.rigzone.com/training/insight.asp?insight_id=333&c_id=24</ref></onlyinclude>		<onlyinclude>A '''well casing''' is a lining that is installed in an [[oil well]] once it is drilled and surrounds the well entirely. Casing is typically hollow steel pipe that lines the inside of the [[wellbore]].<ref name="RE2">FracFocus. (October 18, 2015). ''Well Casing'' [Online]. Available: http://fracfocus.org/hydraulic-fracturing-how-it-works/casing</ref> Casings are used to support the well, as the raw sides of the well would collapse in without support.<ref name="RE1">Rigzone. (October 18, 2015). ''Well Casing'' [Online]. Available: http://www.rigzone.com/training/insight.asp?insight_id=333&c_id=24</ref></onlyinclude>

	[[File:Pump_Jack_labelled2.png\|400px\|framed\|center\|Figure 1. A diagram of a [[pump jack]] and wellbore, including a diagram of the well casing.<ref>Wikimedia Commons. (October 18, 2015). ''Pump Jack'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/3/3f/Pump_Jack_labelled.png</ref>]]		[[File:Pump_Jack_labelled2.png\|400px\|framed\|center\|Figure 1. A diagram of a [[pump jack]] and wellbore, including a diagram of the well casing.<ref>Wikimedia Commons. (October 18, 2015). ''Pump Jack'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/3/3f/Pump_Jack_labelled.png</ref>]]

J.williams: 1 revision imported

2015-11-13T01:47:46Z

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Jmdonev at 05:40, 10 November 2015

2015-11-10T05:40:43Z

← Older revision		Revision as of 05:40, 10 November 2015
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	[[Category:Done 2015-09-06]] [[~~Category: Check Images~~]] ~~[[Category: Needs citations]]~~		[[Category:Done 2015-10-15]]
	~~[[File:~~Casing~~-diagram.jpg\|framed\|Well casing diagram~~.<ref>http://fracfocus.org/hydraulic-fracturing-how-it-works/casing</ref>]]		<onlyinclude>A '''well casing''' is a lining that is installed in an [[oil well]] once it is drilled and surrounds the well entirely. Casing is typically hollow steel pipe that lines the inside of the wellbore.<ref name="RE2">FracFocus. (October 18, 2015). ''Well Casing'' [Online]. Available: http://fracfocus.org/hydraulic-fracturing-how-it-works/casing</ref> Casings are used to support the well, as the raw sides of the well would collapse in without support.<ref name="RE1">Rigzone. (October 18, 2015). ''Well Casing'' [Online]. Available: http://www.rigzone.com/training/insight.asp?insight_id=333&c_id=24</ref></onlyinclude>
	<~~onlyinclude~~>A '''~~well casing~~'~~'' is a lining that surrounds drilled wells~~. ~~The purpose of a casing is to isolate the contents of the well from the surrounding rock and soil, to prevent loss of product as well as contamination~~.</onlyinclude>

	~~The well casing is constructed in multiple parts~~. ~~The interior~~ of ~~the casing is made from steel~~, ~~and is smaller than the diameter of the well. The exterior of the casing is made~~ of ~~concrete, poured into~~ the ~~gap between~~ well ~~and steel~~ casing. ~~This creates a further barrier and prevents the interior casing from shifting~~. ~~Furthermore~~, the thickness of the casing varies depending on the depth, with the casing being thicker near the top of the well, where it is surrounded by soil and permeable rock, and thinner lower down in the well, where it is surrounded by [~~[solid~~]] ~~rock.~~		[[File:Pump_Jack_labelled2.png\|400px\|framed\|center\|Figure 1. A diagram of a [[pump jack]] and wellbore, including a diagram of the well casing.<ref>Wikimedia Commons. (October 18, 2015). ''Pump Jack'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/3/3f/Pump_Jack_labelled.png</ref>]]

	~~The proper~~ casing of ~~a well is critical, as it prevents any chemicals used inside~~ the well from ~~leaching into~~ the surrounding soil and rock. ~~In theory~~, ~~a well~~ that ~~is properly cased should prevent any~~ contamination of [[groundwater~~]]. This~~ is a concern when drilling either for [[natural gas]] or [[petroleum]].		In addition to providing support, the casing also isolates the contents of the well from the surrounding rock and soil. This prevents a loss of product and prevents contamination of surrounding rock and groundwater. It is the concrete component - a mix of cement, sand, and aggregate mixed with water - of the casing that provides the most protection against leakage.<ref name="RE1"/> The contamination of groundwater is a concern when drilling either for [[natural gas]] or [[petroleum]]. Additionally, casing is used to transport fluids back out of the well from well treatment.

			==Casing a Well==
			The well casing is constructed in multiple sections. Each length of casing is referred to as a casing string.<ref name="RE2"/> The interior of the casing is composed of steel and is smaller than the diameter of the well. The casing of the well is accomplished in phases, beginning with the largest diameter casing and ending with the smallest. Each section of the casing is connected by a collar or coupling.<ref name="RE1"/> The exterior of the casing is made of concrete.<ref name="RE1"/> It is poured into the gap between the well and steel casing once it has been inserted. This creates another barrier layer and prevents the interior casing from shifting.

			The thickness of the casing varies depending on depth, with the casing being thicker near the top of the well where it is surrounded by soil and permeable rock that would easily transport contaminants if they were released. Near the bottom of the well, the casing is thinner as it is surrounded by solid, more [[permeability\|impermeable]] rock that wouldn't transport contaminants as easily.

			==Capping a Well==
			Oil wells can be abandoned when they no longer produce enough [[oil]] or [[natural gas]] to be economically feasible. In this case, the well must be closed off properly to ensure that they do not pose a risk to the [[environment]] if abandoned. The process of closing off a well that is to be abandoned is known as '''capping the well'''. The first step in capping the well involves cleaning the wellbore of any oil or gas that could corrode the inside of the casing and reduce the effectiveness of any of the layers that prevent leakage. Any deficiencies identified in the casing itself must be repaired to ensure a tight seal. The well is then filled with water and other noncorrosive fluids. Once the inside of the well is prepared for abandonment, the well is cut and capped. In this process, the casing is cut one metre below the surface and a cap is placed on top of the well casing.<ref>Alberta Energy Regulator. (November 2, 2015). ''Why are Wells Abandoned'' [Online]. Available: https://www.aer.ca/abandonment-and-reclamation/why-are-wells-abandoned</ref>

	==References==		==References==
	{{reflist}}		{{reflist}}
	[[Category:Uploaded]]		[[Category:Uploaded]]

J.williams: 1 revision imported

2015-09-18T16:51:04Z

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Jmdonev at 20:08, 3 September 2015

2015-09-03T20:08:34Z

← Older revision		Revision as of 20:08, 3 September 2015
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	[[Category:Done 2015-02-15]] [[Category: Check Images]] [[Category: Needs citations]]		[[Category:Done 2015-09-06]] [[Category: Check Images]] [[Category: Needs citations]]
	[[File:Casing-diagram.jpg\|framed\|Well casing diagram.<ref>http://fracfocus.org/hydraulic-fracturing-how-it-works/casing</ref>]]		[[File:Casing-diagram.jpg\|framed\|Well casing diagram.<ref>http://fracfocus.org/hydraulic-fracturing-how-it-works/casing</ref>]]
	<onlyinclude>A '''well casing''' is a lining that surrounds drilled wells. The purpose of a casing is to isolate the contents of the well from the surrounding rock and soil, to prevent loss of product as well as contamination.</onlyinclude>		<onlyinclude>A '''well casing''' is a lining that surrounds drilled wells. The purpose of a casing is to isolate the contents of the well from the surrounding rock and soil, to prevent loss of product as well as contamination.</onlyinclude>

	The well casing is constructed in multiple parts. The interior of the casing is made from steel, and is smaller than the diameter of the well. The exterior of the casing is made of concrete, poured into the gap between well and steel casing. This creates a further barrier and prevents the interior casing from shifting. Furthermore, the thickness of the casing varies depending on the depth, with the casing being thicker near the top of the well, where it is surrounded by soil and permeable rock, and thinner lower down in the well, where it is surrounded by solid rock.		The well casing is constructed in multiple parts. The interior of the casing is made from steel, and is smaller than the diameter of the well. The exterior of the casing is made of concrete, poured into the gap between well and steel casing. This creates a further barrier and prevents the interior casing from shifting. Furthermore, the thickness of the casing varies depending on the depth, with the casing being thicker near the top of the well, where it is surrounded by soil and permeable rock, and thinner lower down in the well, where it is surrounded by [[solid]] rock.

	The proper casing of a well is critical, as it prevents any chemicals used inside the well from leaching into the surrounding soil and rock. In theory, a well that is properly cased should prevent any contamination of [[groundwater]]. This is a concern when drilling either for [[natural gas]] or [[petroleum]].		The proper casing of a well is critical, as it prevents any chemicals used inside the well from leaching into the surrounding soil and rock. In theory, a well that is properly cased should prevent any contamination of [[groundwater]]. This is a concern when drilling either for [[natural gas]] or [[petroleum]].

J.williams: 1 revision imported

2015-08-26T21:31:48Z

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J.williams at 17:00, 12 August 2015

2015-08-12T17:00:32Z

New page

[[Category:Done 2015-02-15]] [[Category: Check Images]] [[Category: Needs citations]]
[[File:Casing-diagram.jpg|framed|Well casing diagram.<ref>http://fracfocus.org/hydraulic-fracturing-how-it-works/casing</ref>]]
<onlyinclude>A '''well casing''' is a lining that surrounds drilled wells. The purpose of a casing is to isolate the contents of the well from the surrounding rock and soil, to prevent loss of product as well as contamination.</onlyinclude>

The well casing is constructed in multiple parts. The interior of the casing is made from steel, and is smaller than the diameter of the well. The exterior of the casing is made of concrete, poured into the gap between well and steel casing. This creates a further barrier and prevents the interior casing from shifting. Furthermore, the thickness of the casing varies depending on the depth, with the casing being thicker near the top of the well, where it is surrounded by soil and permeable rock, and thinner lower down in the well, where it is surrounded by solid rock.

The proper casing of a well is critical, as it prevents any chemicals used inside the well from leaching into the surrounding soil and rock. In theory, a well that is properly cased should prevent any contamination of [[groundwater]]. This is a concern when drilling either for [[natural gas]] or [[petroleum]].

==References==
{{reflist}}
[[Category:Uploaded]]