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Fracking
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<blockquote data-quote="MrHillsdown" data-source="post: 989783" data-attributes="member: 17850"><p>Whether or not your waterwell could be damaged depends on a lot of factors. At what depth is the hydrocarbon bearing formation that is to be fracked in relation to the depth of your water well? Where is the surface casing landed? Was the cementjob succesfull on both the surface casing and the production casing? After the well is drilled and cased, cement is pumped down the casing and back up the annulus between the casing and the open hole. This serves two critical purposes: it isolates different formations from each other outside the casing (including your aquifer) and it supports the casing. What's important here is that the surface casing is landed deep enough to cover your aquifer and that it is cemented properly to prevent hydrocarbons to come to surface outside the casing. Also, are they hydraulically fracturing or are they using Nitrogen to break the formation? Nitrogen is typically used on coalbed formations and are usually a lot closer to the surface increasing the risk of contaminating your well. However, in todays oilpatch here in Western Canada most drilling is done in shale formations at greater depths and horizontally. This means that they drill vertically for a distance and then veer off horizontally into the shale. So this means that just because there is a wellhead in your backyard, the oil or gas producing section of the well might be a mile or more away from your waterwell. What I would do in your case is to have a sample of your water analyzed prior to the well being drilled. Also I would ask the oilcompany for a welldiagram, cement data , results of the surface casing vent test and a cement bond log. They don't have to give you this stuff, but none of it is exactly topsecret in that it would reveal proprietary data pertaining to the hydrocarbon bearing zones they are producing. If they do give it to you, you can forward it on to HD and we'll have a looksie.</p></blockquote><p></p>
[QUOTE="MrHillsdown, post: 989783, member: 17850"] Whether or not your waterwell could be damaged depends on a lot of factors. At what depth is the hydrocarbon bearing formation that is to be fracked in relation to the depth of your water well? Where is the surface casing landed? Was the cementjob succesfull on both the surface casing and the production casing? After the well is drilled and cased, cement is pumped down the casing and back up the annulus between the casing and the open hole. This serves two critical purposes: it isolates different formations from each other outside the casing (including your aquifer) and it supports the casing. What's important here is that the surface casing is landed deep enough to cover your aquifer and that it is cemented properly to prevent hydrocarbons to come to surface outside the casing. Also, are they hydraulically fracturing or are they using Nitrogen to break the formation? Nitrogen is typically used on coalbed formations and are usually a lot closer to the surface increasing the risk of contaminating your well. However, in todays oilpatch here in Western Canada most drilling is done in shale formations at greater depths and horizontally. This means that they drill vertically for a distance and then veer off horizontally into the shale. So this means that just because there is a wellhead in your backyard, the oil or gas producing section of the well might be a mile or more away from your waterwell. What I would do in your case is to have a sample of your water analyzed prior to the well being drilled. Also I would ask the oilcompany for a welldiagram, cement data , results of the surface casing vent test and a cement bond log. They don't have to give you this stuff, but none of it is exactly topsecret in that it would reveal proprietary data pertaining to the hydrocarbon bearing zones they are producing. If they do give it to you, you can forward it on to HD and we'll have a looksie. [/QUOTE]
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