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Reply #84: This isn't Frio sands [View All]

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Braulio Donating Member (860 posts) Send PM | Profile | Ignore Tue Jun-29-10 06:55 PM
Response to Reply #76
84. This isn't Frio sands
Deep sea sediments are usually very soft sand and shale or mud layers. Near the Mississippi river mouth these can be extremely unconsolidated, to the point that mud flows aren't uncommon. These sediments are very young, many of these deposits are Holocene age, and the top layers are in a sense anthropogenic, caused by the excessive dredging by the US Corps of engineers (which have extended the bird foot delta to an anomalous reach into the Gulf of Mexico). This means the sediments at 5000 feet below sea level are mushy. The first three thousand feet or so are very soft as well. So what do you get when you have a cased well (and these wells will have 30 inch to 16 inch concentric casings)? You have gun barrel. BP seems to have used a weak completion practice, and I heard a piece of casing was set without lock down rings. This piece of casing was blown up into the blow out preventer assembly - which is the reason why the blind rams failed. So you got a pretty weird configuration now, a pinched casing string (pinched by multiple rams?), and a the remaining casing strings set below the wellhead. You can't even pump in liquid explosives into the well via the kill line, because the oil coming out blows it back out. Which means your experience completing land wells in Texas just won't do you any good.
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