A cement bond log (CBL) was planned in a 7” liner where simulations had indicated that a Well Tractor® might be needed due to the 66° deviation. During operations, however, it was confirmed that the tools were not required and they were released. Unfortunately, the CBL revealed that the cement quality was poor and the operator was required to perform a remedial, cement squeeze job to rectify.
Following this, another CBL pass would be run to confirm that the squeeze job was effective. The operator proceeded with the cement squeeze, followed by a clean-out operation and then attempted to re-run the CBL. Only this time the tools were unable to get down, consistently hanging up at the 7” liner hanger and making the repeat CBL pass impossible.
Now, the operator needed a fast remedy and immediately called Welltec back.
Only four hours after receiving the call, Welltec® had prepared and sent a package of tools to the client’s shipping base. Welltec’s crew went offshore on the next available transportation and rigged up the Well Tractor 412 as soon as possible. With no problems the Well Tractor conveyed the CBL through the liner hanger and all the way to total depth at 9,334 ft (2,845 m MD), which involved about 984 ft (300 m) of tractoring. The job was finished quickly and successfully, meeting all objectives.
The clean-out intervention was completed in 34 days of daylight operations and provided confirmation of the total amounts of sand recovered to surface. The Well Cleaner® PST proved to be an efficient alternative to a conventional coiled tubing unit for this operator who applied the solution for the first time. HSE risks were reduced by applying e-line compared to heavier intervention methods like coiled tubing; less and lighter equipment was involved, fewer lifts were required and mobilization was done considerably faster with Welltec’s solution.
WELL TYPE: PRODUCER
MAX. DEVIATION: 66º AT 9,334 FT
MAX. DEPTH: 9,334 FT
Andres Lambea, Lead Engineer Drilling Technology, Statoil ASA
“Very good job done by yourself, your duty team and offshore personnel yesterday. It was very impressive how quickly you were able to mobilize all necessary equipment”