23 March 2024
OBJECTIVE:
During initial well testing operations a Go Devil was used to tag TD of the well, although this operation had previously been performed successfully the toolstring became stuck and after multiple days attempting to free it the 0.092” Slickline broke at surface and was lost in the well.
Our objective for the fishing operation was to recover all the slickline and if possible recover the lost toolstring from the open hole well section.
OPERATIONAL OVERVIEW:
First step in the operation was to run a live EV Downhole Camera to locate the top of the broken slickline. The run was successful and the top of the slickline was located at 227m CF. Clearly visible in the images was at least 2 coils of slickline centered in the well bore.
Reviewing the DHV data it was decided to proceed with the next planned step, swaging off the slickline at the top of the 8 5/8” liner.
The Second step in the operation was to cut off the lost slickline at the 8 5/8” liner. We successfully passed the 8.600” Swaging Tool past the top of the slickline at 227mCF. Once past the top of slickline the tools continued to be Run in Hole without encountering any hold ups, until approximately 600mCF where small fluctuations in weight were noted but the tools continued to move freely. At 872mCF downward progress was stopped by an unknown obstruction. Multiple attempts were made to work the tools passed the obstruction but were unsuccessful. Concern about damaging the lost slickline this operation was halted & the tools recovered to surface.
Initial planning called for the use of a 12.400” radial brush to locate the slickline in the 13 3/8” liner, due to a 10” upper valve being installed on the well, restricting well bore access, it was decided the best option would be to utilize an 6.125” Adjustable Wire Finder/Grab set to 8.500” OD. The top of the wire was located at 265mCF, 100lbs weight was set down on top of the slickline, small weight increases were noted & it was decided to recover to surface & check if a latch had been achieved. Once the tools had been recovered to surface & the recovery spool lifted it was found the slickline had not been grabbed but there were markings indicating contact with the fish.
The same 8.500” Wire Finder/Grab was utilized again. The slickline was again found at 265mCF. The toolstring was worked down to 272mCF. A pick up weight was performed & confirmed the fish had been grabbed & was being held by the Wire Finder/Grab.
A 500lbs overpull was noted at 175mCF, at approx. 1500lbs line tension the slickline broke down hole and recovery to surface continued.
Once recovered into the recovery spool the well was monitored for vacuum and the quenching rates were confirmed, before the tools and fish were removed.
A total of 21.4lbs of wire was recovered, equivalent to 284m.
The 8.500” Wire Finder/Grab was again utilized after being check for damage & tightness. The top of the slickline was located at 350mCF, the tools were worked downwards checking for latching of the fish every 10m, at 380m a final pick up weight was performed and confirmed, the fish had been latched with approximately 200lbs increase in line tension.
Tools were recovered to surface, the well checked for vacuum and quenching rates confirmed.
The fished slickline was clamped, the fishing toolstring broken down and replaced with a 2ft long nipple brush. The fished slickline was attached to the nipple brush and stripped from the well in approximately 13m lengths 6 times until undamaged slickline was found.
The fished slickline was then spooled onto the E-line winch. Approximately 100m was recovered before a birds nest was found. The slickline was again clamped and the birds nest removed before winch operations could resume.
A total of 1580m of slickline was recovered from the well. The end of the slickline indicated a break.
SUMMARY:
Upon calculations and inspection of the break at the end of the wire it was determined that a maximum of 40m of 0.092” slickline could remain in the well. Calculations were based on the weight of slickline recovered and are for unused slickline. The slickline lost in the well was well used and had been subjected to high tension failure causing elongation. The slickline in question would have weighed less than the weight specified by the manufacturer.
To confirm the liner was free from slickline the Downhole Camera was utilized & ran to a depth of 1750mCF. At this point the well temperature was increasing to above 90 degrees Celsius and the operation was halted due to lack of visibility and temperature limits. No slickline was visible to 1750mCF.
On 23-March-2024 the well was cut in and brine injection commenced.
TOOLSTRINGS:
AFTER ACTION REVIEW:
Well Head diagrams or specification available before operations are planned.
Use of the Downhole Camera during fishing operations was a key point in this operation being successful and reduced the risk of fishing toolstrings becoming stuck. The top of the lost slickline was found significantly higher than expected.
2 wire clamps would have been advantageous to the operation.
Higher injection rate would have provided a reduction in temperature and allowed the Downhole Camera to be run deeper during the final confirmation run.
HSE | SITE SPECIFIC SAFETY:
Extra Care should be taken while changing tools. Minimizing body parts & time spent close to a suspended load.
While it is impossible to completely remove working in proximity to suspended loads during wireline operations exposure should be limited as much as possible. Minimum number of personal required for the operation should be in the red zone (no spectators), where ever possible suspended loads should be kept below head height.
Work was being conducted close to an open cellar, extra caution was taken to move operations a safe distance from the cellar where ever possible.
Weather conditions can changing rapidly, be prepared for unexpected changes & monitor wind speeds.
Fall protection should be worn & tied off at all times whilst working on the scaffold.
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