TecWell Well Leak Detector (WLD)
The Well Leak Detector (WLD), a cased-hole logging tool developed by TecWel, detects and locates leakage in a wellbore with a depth accuracy of a few inches. Any oil, gas, water or multiphase fluid leak can be detected with rates from as small as 0.02 liter/min (or 0.004 GPM) and upwards. Also multiple leaks in a wellbore can be detected.
With the WLD TecWel is able to detect any leak in:
1. The production packer
2. The expansion joint, or any other subassembly
3. The tubing
4. The Downhole Safety Valve - DHSV
5. The control line to the DHSV
6. Any of the casings in the well
7. The wellhead
Specifications for using the tool:
The WLD is deployed inside the tubing, even when logging to identify a casing leak. While logging with the WLD, the only thing that the WLD needs is an active leak, and the subjection of the failing barrier to a ΔP (differential pressure) causing a flow of fluids through the leak point(s) (i.e. generating an active leak). While logging with a line speed from 3 to10 m/min (10 to 30 ft/min) to locate a leak, the well could be shut in, producing or injecting into the reservoir and still the WLD can find the leak point. The WLD can also been run inside a casing (i.e. no tubing installed in the well).
WLD Specification
*Leakage location accuracy：± 0.1 metre (3.9 inches)
*Min. detectable leak rate for liquids：0.02 litre/minute (0.0052 gal/min.)
*Min. detectable leak rate for gas under downhole conditions：0.02 litre/minute (0.0052 gal/min.)
*Min. required ΔP across the leak point：> 3 bar (45 psi)
*Repeatability：1 %
Deployment
Electric line (mono conductor)
Well tractor
Coiled tubing
Depth correlation：CCL (GR is an option)
Maximum line speed while logging：10 m/min. (30 ft/min)