PowerSwitch Main Page
PowerSwitch
The UK's Peak Oil Discussion Forum & Community
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Methane contamination rises near shale gas sites
Goto page 1, 2  Next
 
Post new topic   Reply to topic    PowerSwitch Forum Index -> Hydrocarbons
View previous topic :: View next topic  
Author Message
Kieran



Joined: 25 Jul 2006
Posts: 1091
Location: West Yorkshire

PostPosted: Tue May 10, 2011 1:02 pm    Post subject: Methane contamination rises near shale gas sites Reply with quote

http://www.guardian.co.uk/environment/2011/may/09/shale-gas-methane-drinking-water

"Methane levels in water supplies close to shale gas extraction sites in Pennsylvania and upstate New York are up to 17 times higher than normal, according to research.

A study on the impact of drilling in the region found that about 85% of drinking water wells within 1km of a natural gas well were contaminated.

The study is the latest to challenge efforts to sell natural gas as a cleaner, safer source of energy, and could build momentum for greater federal governance of the industry."

Article continues...
Back to top
View user's profile Send private message
RGR
Banned


Joined: 07 Dec 2007
Posts: 2011
Location: Rocky Mountains, USA

PostPosted: Mon Jun 20, 2011 3:49 pm    Post subject: Re: Methane contamination rises near shale gas sites Reply with quote

[quote="Kieran"]

Last edited by RGR on Fri Aug 12, 2011 6:21 am; edited 1 time in total
Back to top
View user's profile Send private message Send e-mail
An Inspector Calls
Banned


Joined: 27 Jan 2011
Posts: 961

PostPosted: Fri Jun 24, 2011 9:19 am    Post subject: Reply with quote

I don't understand the mechanics of how fracing is supposed to result in water contamination.

As I understand thus far, the water bearing rocks are usually above the shale gas rock and to get to the shale you have to drill through the water levels. Fracing involves water at very high pressure (>100 Bar!) being injected into the shale. It will be necessary to line the drill pipe in order to achieve these high pressure levels. Any leakage in the drill pipe will compromise the ability of getting high pressures at the shale level.

So, if that's the case, the risk of water contamination must be low.

Or am I missing something?
Back to top
View user's profile Send private message
RGR
Banned


Joined: 07 Dec 2007
Posts: 2011
Location: Rocky Mountains, USA

PostPosted: Fri Jun 24, 2011 2:34 pm    Post subject: Reply with quote

[quote="An Inspector Calls"]

Last edited by RGR on Fri Aug 12, 2011 6:21 am; edited 1 time in total
Back to top
View user's profile Send private message Send e-mail
An Inspector Calls
Banned


Joined: 27 Jan 2011
Posts: 961

PostPosted: Fri Jun 24, 2011 3:03 pm    Post subject: Reply with quote

So for supposed well casing failures where water contamination was detected possibly due to negligence at the fracing 'plant', a quick pressure test on the wells concerned would soon indicate if there's a potential leak or not. The nice thing about the fracing process seems to be, then, that it demands technical excellence for it to have any possibility of success.

Just what is the fracing pressure? You talk of well depths of 10,000' (3,000m), so to me that would imply the 'background' hydraulic pressure must be 300 Bar and so you'd need something like that pressure to frac?. Jee wiz, these are high pressures - very dangerous too!
Back to top
View user's profile Send private message
RGR
Banned


Joined: 07 Dec 2007
Posts: 2011
Location: Rocky Mountains, USA

PostPosted: Fri Jun 24, 2011 6:49 pm    Post subject: Reply with quote

[quote="An Inspector Calls"]

Last edited by RGR on Fri Aug 12, 2011 6:21 am; edited 1 time in total
Back to top
View user's profile Send private message Send e-mail
kenneal - lagger
Site Admin


Joined: 20 Sep 2006
Posts: 9822
Location: Newbury, Berkshire

PostPosted: Sat Jun 25, 2011 4:03 am    Post subject: Reply with quote

If the shale strata is under water bearing strata could the fracking pulse not blow gas into the water column from where is would migrate upwards?
_________________
"When the last tree is cut down, and the last river has been poisoned, and the last fish has been caught, Only then will you find out that you cannot eat money". --The Cree Indians
Back to top
View user's profile Send private message Send e-mail Visit poster's website
RGR
Banned


Joined: 07 Dec 2007
Posts: 2011
Location: Rocky Mountains, USA

PostPosted: Sat Jun 25, 2011 4:39 am    Post subject: Reply with quote

[quote="kenneal"]

Last edited by RGR on Fri Aug 12, 2011 6:22 am; edited 1 time in total
Back to top
View user's profile Send private message Send e-mail
An Inspector Calls
Banned


Joined: 27 Jan 2011
Posts: 961

PostPosted: Sat Jun 25, 2011 9:36 am    Post subject: Reply with quote

RGR:
Can you direct me to a web site, (or god-forfend, a book) that gives an introduction to the techniques we're discussing?
Back to top
View user's profile Send private message
kenneal - lagger
Site Admin


Joined: 20 Sep 2006
Posts: 9822
Location: Newbury, Berkshire

PostPosted: Sun Jun 26, 2011 2:33 am    Post subject: Reply with quote

I'm couldn't say for certain but I don't think the shales in the UK are more than 500 to 600 foot thick so water contamination could be a problem.

I'm not sorry about asking someone for the benefit of their expertise. No point in having him here and not using experience.
_________________
"When the last tree is cut down, and the last river has been poisoned, and the last fish has been caught, Only then will you find out that you cannot eat money". --The Cree Indians
Back to top
View user's profile Send private message Send e-mail Visit poster's website
An Inspector Calls
Banned


Joined: 27 Jan 2011
Posts: 961

PostPosted: Sun Jun 26, 2011 4:37 pm    Post subject: Reply with quote

Does anyone know much about any of the UK shale deposits?

And even so, the width of the shale strata is immaterial: it's the distance between the shale strata and the water bearing strata that matters.
Back to top
View user's profile Send private message
Bandidoz
Site Admin


Joined: 24 Nov 2005
Posts: 2705
Location: Berks

PostPosted: Mon Jun 27, 2011 4:32 pm    Post subject: Reply with quote

<deleted the sock-puppet accusations>
_________________
Olduvai Theory (Updated) (Reviewed)
Easter Island - a warning from history : http://dieoff.org/page145.htm
Back to top
View user's profile Send private message
RGR
Banned


Joined: 07 Dec 2007
Posts: 2011
Location: Rocky Mountains, USA

PostPosted: Mon Jun 27, 2011 9:57 pm    Post subject: Reply with quote

[quote="An Inspector

Last edited by RGR on Fri Aug 12, 2011 6:22 am; edited 1 time in total
Back to top
View user's profile Send private message Send e-mail
RGR
Banned


Joined: 07 Dec 2007
Posts: 2011
Location: Rocky Mountains, USA

PostPosted: Mon Jun 27, 2011 10:02 pm    Post subject: Reply with quote

[quote="kenneal"

Last edited by RGR on Fri Aug 12, 2011 6:22 am; edited 1 time in total
Back to top
View user's profile Send private message Send e-mail
RGR
Banned


Joined: 07 Dec 2007
Posts: 2011
Location: Rocky Mountains, USA

PostPosted: Mon Jun 27, 2011 10:04 pm    Post subject: Reply with quote

[quote="An Inspector Calls"]

Last edited by RGR on Fri Aug 12, 2011 6:23 am; edited 1 time in total
Back to top
View user's profile Send private message Send e-mail
Display posts from previous:   
Post new topic   Reply to topic    PowerSwitch Forum Index -> Hydrocarbons All times are GMT + 1 Hour
Goto page 1, 2  Next
Page 1 of 2

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group