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Geology/wirline supervision


dear sir,
         sir geologist ask to supervise the wire-line logging in wire line truck or unit .
what is the silent feature that well-site Geologist is look and Note in open and cased hole during wire line logging supervision.

B.H Islamabad

Dear Waqar,

Thanks for sending me your question;

Wellsite Geologists is the company representative on drilling rig and his job is to supervise all geological operations such as mud logging, wireline logging and coring safely, timely and as per the established standards of the oil company, and he or she is trained to perform wireline logging witnessing and ensure the quality check of the recorded data.

Wireline engineers are also very well trained to acquire flawless data and ensure the quality of the data as per their own standards and also to  the standards of the operating company.

Every logging tool has to be fully calibrated against known physical values prior to the wireline logging operation starts.

Wireline tool are calibrated in logging workshop but also need to be cross checked while running in the hole. The witnessing geologist has the responsibility to ensure  that provided tools on the site are calibrated and marked and flagged  properly on every tool and ensure the date of calibration.

While tool running in the hole the tools can be cross-checked against known values. For example, Bore Hole Sonic compensated tool (BHC) should read 57 microsecond per foot against casing which is a standard reading and is a good way to calibrate the precision and readiness of BHC tool.

Wireline engineer should have to include such tests in the main logs as the witness of tool reliability.

Every tool has a specific logging speed which needs to be maintained for good quality data. Logging Tool while logging if too slow or too high data would be manipulated so a speed of logging needs to be optimized.

Following is the list of checks witnessing geologist need to know while observing logging;

Well name, company name, operating company name, well coordinates, Kelly Bushing, time of logging, time circulation starts stops,
note the depth of the well bore
casing depths
collar lengths
Tools workshop calibration
Pre-run calibration of tools
ensure all calibration quality check forms are filled
logging speed of each tool.

Mark tight hole and bad hole, ensure that while pulling out of hole overpull should be applied as per permissible limits to protect wireline tool from breaking.

Bottom hole or maximum temperature  and ensure that surface temperature is recorded
mark the well tops.

Mud properties are entered into logging program and marked on (wireline engineer record all mud properties).

At the depth where data quality is bad witnessing geologists and engineer should note it and maintain a record book and if requires add in logs in the comments part.

Engineer and witnessing geologist should ensure that all problematic events should be properly marked on the final logs in comments sections

Hope this answer helps.  


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Syed Tariq Hasany


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