Re: Earthscope Page
- From: "George" <george@xxxxxxxxxxxxxxxxxxxxx>
- Date: Sat, 21 Jan 2006 15:28:35 GMT
"Aidan Karley" <doIlookDAFTenoughTOpost@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
wrote in message
news:VA.00000bdf.0d216cde@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> In article <ldb2t1h8lgdck029t79nv9hn1siaqle4ok@xxxxxxx>, Bob Officer
> wrote:
>> http://www.earthscope.org/
>>
>> Happy reading!
>>
> Hmm, it's obviously too early in the morning for me. I'm sure
> they said "40 arm caliper to measure casing deformation" on that page.
> Or words to that effect. 4 arms can lead to non-unique solutions for
> deformation ellipse, which is why 6 arm is what's normally called for
> if you think your casing is getting squished (but 4 arm is sufficient
> for wellbore cement volume calculations). "40 arms" would be severe
> overkill. And quite who would build such a monstrosity, I don't know.
> If you stacked 8 x 4-arm calipers together, with suitable offsets, the
> flex in the toolstring would almost certainly be above 10 degrees,
> rendering the alleged precision moot. 6 x 6-arm might be more credible.
> But bussing the signals would be a nightmare too.
> Nah, back to bed for a couple of hours until I can make sense of
> that.
>
> --
> Aidan Karley FGS
> Aberdeen, Scotland,
> Location: 57°10'11" N, 02°08'43" W (sub-tropical Aberdeen), 0.021233
It's probably a typo.
George
.
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