The Overlooked Detail That Threw a Job Off Depth

Posted on by Crissa Fel Tawadan

In the wireline industry, precision is everything. Whether it’s wireline logging, downhole tools, or perforating services, even the smallest oversight can lead to big problems. One such issue? Incorrect GEO-LOG measuring wheels.

What Went Wrong?

A recent job went sideways when a well was logged off depth. The root cause? The GEO-LOG measuring head was fitted with the wrong measuring wheel rim for the wireline cable size in use.

A simple mistake, yet one that cost time, credibility, and efficiency.

Why the Right Measuring Wheel Matters

The three-foot GEO-LOG measuring head is adjustable for wear and requires a specific measuring wheel rim for different line sizes. Each wireline cable size must have a properly sized rim to ensure accuracy. The last three digits of the part number on the measuring wheel rim indicate the compatible line size.

A mismatched rim results in incorrect depth measurements, leading to potential tool misplacement, lost time, and a frustrated client.

How to Prevent It

To avoid such costly errors, wireline service providers must:

  • Verify All GEO-LOG Measuring Wheels – Ensure that the correct measuring wheel rim is installed for the specific cable size before every job.
  • Inspect Measuring Heads – Regularly check for wear and ensure that all components are in good working order.
  • Train Field Personnel – Every wireline tech should be aware of the importance of using the right measuring wheel and how to verify compatibility.
  • Consult the GEO-LOG Database – Reference the GEO-LOG website to confirm the correct wheel rim for each line size.

The Bottom Line

Wireline operations demand accuracy. Whether you’re handling wireline well logging, cased hole logging, or production logging services, small equipment errors can have major consequences. Something as simple as checking the measuring wheel rim before mobilizing can mean the difference between a smooth job and a major setback.

Next time you’re gearing up for a run, double-check that measuring head. The time you take now could save you from a much bigger problem downhole.