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- #41
Yes Pleasedo you want a beer??
Yes Pleasedo you want a beer??
Yes Please
I won't crac the bottleOk. Don't frac the bottle. (Crack)
Kokanee on the way.
I have been on two fracs where this happened.
One was where the casing split 200m below surface and it migrated to surface.
Both were casing failures and partially due to poor cement and H2S corroding the casing. So it does happen, but not as often as some would like you to believe.
The problem if it occurs is usually due to something related to drilling not the frac. And most often bad cement. Whether the wells were frac'd or not, eventually a problem would have come to surface. People just like to blame the frac process because it's a convenient scapegoat that in reality only exposed the problem.
I will say though that shallow gas fracs are more likely to cause water table issues because many are in the 600-1200m depth range and due to the formation make up (usually coal or shales) the high pressures can cause migration of the fractures and gasses outside of the intended frac zone. Communication issues with the water tables and other producing zones are more prevalent in these areas, but they are much different than the high hp fracs that are being mentioned in this thread.
I'm not talking about fluid raining down on the lease due to casing failure. I've seen this happen too. This is not a frac breaching surface this is a casing failure. There has been many thousands of shallow gas well fracs in Southern Alta/Sask and Montana less than 500 meters deep. You would think if a frac is going to reach ground water one would have heard of a frac breaching surface on one of these wells.
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