Quote:
Originally Posted by JD
As a cementer, I cringe at this suggestion. It's prudent and correct, mind you...
A CBL is open to interpretation as much as anything in this industry, so even between qualified professionals, you can get differing opinions, let alone in a public forum with uninformed views muddying the waters.
With a well like this, you'll very likely run a lightweight lead slurry to ensure returns to surface. In this area, probably 1400 kg/m³ or less. Problem is, those types of cements tend to show poorly on a CBL. So then you're in a catch 22 situation where the public expects cement returns (which they should) but also expect to get positive feedback on the CBL result (which they also should).
So then upon analyzing the CBL, someone will say, "there's no cement from here up!". So we'll go out to remediate and perf and try to circulate to surface but instead pressure up and find that there actually was good cement there all along.
I suppose you could demand proper hole cleaning and mud conditioning and casing centralization and reciprocation/rotation and adequate preflushes and spacers pumped in the optimized flow regimes and a high quality lightweight cement slurry with low fluid loss and no free water, but then the waters would really be muddy. And then you also get back to that point fotze made about the operator being small and perhaps eager to save a buck here and there.
It still amazes me that some companies will try so hard to cheap out on the cement.
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Which is basically the problem with having a debate about an oil well in a public forum in the first place. I don't think anyone here is involved with the well, and different considerations apply in different situations.
I've used CBLs in the past to ensure I have good cement between two different perf intervals where I'm going to shoot all my perfs at the same time and then coilfrac, and I can't have communication outside the casing between the perfs or I'll get a casing collapse. But this isn't multi-horizon gas, so that shouldn't be a problem.