Isolating Potential Flow Zones During Well Construction
API Standard 65 – Part 2
http://www.gwpc.org/sites/default/files/event-sessions/Benge_Glen_Construction.pdf
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“Expert testimony” during the various hearings and commissions referred to various Cement Bond Logs as the
"Gold Standard" when evaluating cement jobs.
My experience in the late 70’s as various service companies And equipment manufacturers were attempting to refine
bond logging and calibration procedures was various engineers referred to us as “snake oil salesmen” and the product
Itself as “snake oil”…During testimony Hafle was asked about running CBL logs on all wells before the temporary P&A
And he got that same “deer in the headlights” look I used to see 35 years ago while making sales calls to various oil companies.
I had to chuckle to myself as I saw that not much had changed from the drilling end in 35 years as far as CBL logging was concerned.
So today, as I read this API Standard 65 -Part 2, I was not surprised to find the following slide in the presentation:
Evaluation – Value of Cement Evaluation Logs
Without a clear understanding of what happened on location, the evaluation of cement quality from only
electronic logging is highly subject to error and “interpretation bias.”
Do not attempt to perform wellbore cementing evaluation based on one single data set.
So much for that “gold standard BS”. LOL!!
http://www.petrolog.net/webhelp/Logging_Tools/tool_cbl/cbl.html#70.
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Reminiscing about old times, i found this brief history of independent wireline manufacturers…
http://www.logwell.com/editorials/mfg_history.html
I had the privilege of working with most of the fellows mentioned in the first 4 companies, especially
Al Biggs with SIE and BF Stout with WPC/Worthwell Surveys as they transitioned surface and down hole tools
From vacuum tubes to transistors and finally integrated circuits.