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Recent Rotary Rig Count May 17th, 2013



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Drilling Ahead

World Oilfield Forum

HPTP wells drilled in shallow (less than 100m) water depth.
Recovery of down hole data is extremely difficult.
The high temperatures 'fry' equipment.
People have suggested using 'mud coolers', this only cools the 'mud' on the surface and as it is pumped.
Mud that is circulated out of the hole, is extremely 'hot' and not much cooling is achieved during transit through the shallow water depths especially across the tropics, where water temperatures are high.

During 'wireline logging', the 'mud' in the well is 'static', and NOT moving. The wellbore temperatures are continuously at a high level.
These temperatures, (above 350F) are 'frying' the tools, the wireline itself is 'melting'.

The question:
Does anyone know of a system that can handle continuous immersion in these 'high' temperatures and recover the well data?

ALL ideas or information will be appreciated.

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I have a question: How does the wire line melt?
The steel line doesn't melt, but the insulated core does, if it's not rated for HT.
In situations like that, I always run Schlumberger high temp LWD so the rock hounds can get all their data while there is circulation there to cool the tools. Secondly sounds like some very poor planning going on from the Engineering aspect. Generally we design a larger annulas volume to allow for better heat dissipation in the hotter holes, and use a more viable mud cooling system than just trying to rely on seawater on the riser. There are many on the market.

And when he is referring to the wireline, more than likely he's referring to the inner shielding on the wireline itself, causing the wireline to cross-short.
You mention 'Generally we design a larger annulas volume to allow for better heat dissipation in the hotter holes, and use a more viable mud cooling system than just trying to rely on seawater on the riser'.
Please explain. These conditions are at the 'bottom' of a hole (2000+ m), with intermediate casing set.
Please explain the 'viable mud cooling system'. The mud in the hole is the problem, NOT above the seabed. Yes there are 'many' mud coolers used above and 'out' of the wellbore.
Please explain to me the difference between WIRELINE tools and LWD tools that are run as part of the BHA.
Call Schlumberger they have the HPHT kit you need, used it myself in Denmark and a few other places where there's a hot hole.
Hi there,

I thank you all for your experiences and will send these on.
Hello Alan,

Weatherford also has a line of LWD tools that will handle your temperatures, the HELL tools I believe are good to 450 deg F or so. The logs are actually run in the drill string and are recorded while in the hole with feed back to surface.

Best regards,
Once again I thank you all for your advise.
LWD is NOT the problem.

WIRELINE LOGGING in a HPHT well that is NOT having fluid circulated at the time of WIRELINE LOGGING is the PROBLEM.

I am attempting to find a solution to wireline logging equipment being damaged by the extreme conditions in a HPHT well that is NOT being circulated during the time the equipment is in the hole.
LWD is nice for drilling, it backs up the mud loggers.
Unfortunately it's not good enough for a formation evaluation, RFT, Neutron Density, or the other myriad logs that can only be done via electric wireline logging.
It lacks the sensitivity and resolution that wireline tools have.
How correct you are.
LWD allows 'early' evaluation, not waiting for extended 'bottoms up' time to scrutinise samples from 'who knows where'.

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