Operational Summary
Total operational time was 7 days, this included standby time for a cyclone & another period of excessive winds.
Fishing Operations were completed in 8 runs, plus 2 additional runs to sweep the well & ensure further operations wouldn’t get stuck in hole.
A single misrun was reported on run #5, this was a planned operation to attempt to grab any cable that may be above the fish, before possibly compacting any cable down with an LIB or Blind Box.
Fish Scenario
During Plug & Perf operations for the SITHP was bled down to 500psi to minimize pressure differential during perforation. At this time a sudden pressure increase was noted & the Perforation toolstring became stuck at approximately 5000mWL. It was suspected the previously set bridge plug failed causing a large pressure increase which pushed the perforation toolstring up past the 5/16” Mono conductor cable, causing the Unperforated gun to become stuck.
A 3.5” Limar Rotating Knife Cutter was deployed along with 2 x 3.5” drop bars & a successful cut was made, recovering majority of the cable.
Program
The fishing program was prepared by the LSWI fishing supervisor with the goal of recovering the maximum amount of lost cable before trying to recover the Perforation toolstring.
Due to the limited clearance between the 2.875” toolstring & the tubing it was decide to run LIB’s & fish the Drop bars/Rotating Knife cutter with pulling tools below the adjustable wire finder, this reduced the risk of lost cable becoming lodged between the toolstring & tubing wall.
A Non Releasable Rope Socket was to be used for initial operations with a change planned to the Releasable Rope Socket once the lost cable had been cleared.
Tool Preparation
The toolstring while brand new had already been inspected by LSWI supervisors, this reduced the required preparation time & work load allowing for it to be completed with only 1 supervisor.
The Accelerators were originally set up with High Load spring stacks, the decision was made to redress 1 accelerator to Standard Load spring stacks as majority of the planned work would be performed with a single accelerator with jar settings within the Standard Load range.
Rig Up
Rig up ran smoothly & no issues were encountered.
A change to the PCE was implemented to include a Quick Test sub above the lower 2 lubricator sections. This allowed the 80ft of lubricator to be picked up & laid down safely without the need for a full PCE pressure test each time.
2 triple ram BOP’s and 2 independent shear rams were utilized in the PCE stack. This would give complete redundancy in case of the primary BOP failing to seal around the fished cable, a high possibility with damaged cable or multiple closures of BOP rams.
Fishing Operations
Run #1
Toolstring #1 (single accelerator, Adjustable Wire Finder c/w 2.62” LIB) was RIH. The fish was located @ 4956mWL. Considerably higher than expected. A light impression was taken so as to not compress any cable present.
The LIB shows a clean impression of the 3.5” Drop Bar.
Run #2
Toolstring #2 (single accelerator, Adjustable Wire Finder c/w 3” JDC) was RIH. The 3.5” Drop Bar was latched @ 4958mWL. It was noted that the depth was slightly deeper than the LIB. Due to high pick up weights over 5000lbs & slightly erratic weights during pick up it was difficult to get positive weight indication that the Drop bar had been latched.
Drop bar was successfully recovered. No visual damage was noted.
Run #3
Toolstring #2 (single accelerator, Adjustable Wire Finder c/w 3” JDC) was RIH. The 3.5” Drop Bar was latched @ 4959mWL. Depth was as expected 1m deeper than the previous Drop Bar. Due to high pick up weights, over 5000lbs & slightly erratic weights during pick up it was difficult to get positive weight indication that the Drop bar had been latched.
Drop bar was successfully recovered. No visual damage was noted.
Run #4
Toolstring #2 (single accelerator, Adjustable Wire Finder c/w 3” JDC) was RIH. The 3.5” Rotating Knife cutter was latched @ 4960mWL. Due to high pick up weights over 5000lbs & slightly erratic weights during pick up it was difficult to get positive weight indication that the Rotating Knife Cutter had been latched.
Rotating Knife Cutter was successfully recovered. A small indentation was noted on the lower face, it is suspected that is where it came into contact with the side of the Cablehead.
Run #5
Toolstring #3 (single accelerator, 3” MAS HDPT jar up, Adjustable Wire Finder c/w 2 Prong Grab) was RIH. The fish was located @ 4961mWL. Attempts to grab cable resulted in a 2000lbs overpull being achieved before the toolstring came free & pick up returned to the previously recorded weight. A decision was made to POOH & inspect tools to see if we had recovered cable.
The 2-prong grab did not recover any cable but one of the lower barbs was considerably deformed. It is suspected that the barb caught on the fishing neck of the Perforating toolstring, resulting in the overpull which released when the barb was deformed.
Run #6
Toolstring #1 (single accelerator, Adjustable Wire Finder c/w 3” LIB) was RIH. The fish was located @ 4961mWL. A light impression was taken so as to not compress any cable present.
The LIB had an impression of cable bent down over the Fishing Neck.
Run #7
Toolstring #4 (single accelerator, Adjustable Wire Finder c/w 3.25” Blind Box) was RIH. The fish was located @ 4961mWL. Downward jarring was commenced with the goal of moving the fish down or boxing off the cable. 4 jars were performed without any downward movement noted. After the 5th downward jar the fish was noted to be 1m deeper. The 6th jar resulted in the tools continuing to RIH. The toolstring was RIH to 4980mWL, without encountering the fish again. It was then decided to POOH rather than tag the fish again.
Run #8
Toolstring #3 (single accelerator, 3” Limar MAS HDPT jar up, Adjustable Wire Finder c/w 2 Prong Grab) was RIH. The fish was located @ 5010mWL. The tools were easily worked down to 5018mWL while performing pick up weight checks every 2m. At this depth a pick up weight was performed & a 500lbs weight increase was noted. This indicated that the Perforating toolstring was still connected to the lost cable. Tools were POOH slowly @ 20m per min until 2000mWL upon which speed was reduced to 8.75m per min to allow the explosives temperature time to reduce to a stable level.
At surface the tool trap was used to locate the Rope Socket of the fishing toolstring, the depth counter reading was noted at this point, the tools continued to POOH until the Cablehead of the Perforating toolstring was located & again the depth was noted. POOH was continued until contact was made with the Grease Injection Head. At this point it was calculated that the fish was above the upper swab on the Frac tree, the upper swab was closed a full 23 turns indicating clear movement. The Hydraulic master valve on the Frac tree was then closed & pressure in the lubricator bleed off slowly so as not to destabilize the explosives.
At this point the LSWI fishing supervisor handed control of operations over to the Explosives handling officer. The temperature of the Perforating gun was measured & found to be well below the safe maximum temperature. The gun was disconnected from the toolstring with additional safety measures in place due to the unknown condition of the Cablehead.
The remaining Perforating toolstring components were laid out & the Adjustable Wire Finder / 2 prong Grab removed to redress.
Complete Perforating toolstring & 12m of cable was safely recovered from the well bore.
Run #9
Toolstring #10 (Single Accelerator, Adjustable Wire Finder, 3.25” Javelin Magnet, 2.72” High Powered Magnet) was RIH to tag depth of 5025mWL.
Magnets did not recover any pieces of cable.
Run #10
Toolstring #1 (single accelerator, Adjustable Wire Finder c/w 3” LIB) was RIH. To tag depth of 5025mWL. An impression was taken.
LIB showed no indication of cable.
Post Operations Redress
Post Operation equipment redress took approximately 14 hours of work. All equipment used was completely stripped, cleaned, inspected then reassembled with appropriate lubricants. Due to the nature of this operation there were no parts that needed to be replaced in the tools.
Tool damage was limited to the 1 barb on the 2-prong wire grab being deformed.
Toolstring Diagrams
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