A client in Angola was suffering from cement issues in their production wells, which had made it mandatory for them to run cement bond logs (CBL) after the cement job. Because of the large casing, 14″ OD, Welltec’s Well Tractor® 412 was the only conveyance solution which could accomplish the job on e-line. During job planning, a third party tried to convince the client that there would be telemetry issues when combining their electronically controlled release device system with the Well Tractor. This is not true and was confirmed by a successful system integration test (SIT) done as part of the pre-job planning. Consequently, the Well Tractor 412 was used to convey the third party CBL toolstring in the 9 5/8” casing for cement integrity evaluation.
Offshore the toolstring was lowered into the well by gravity to a depth of 9,711 ft (2,960 m). Then the Well Tractor was activated and successfully tractored to the total depth at 11,903 ft (3,628 m) where logging was performed up to the casing shoe at 5,971 ft (1,820 m). The client decided to log deeper than the initial target depth so the toolstring was run back from the casing shoe by gravity to a depth of 9,692 ft (2,954m). Here the Well Tractor was powered up and successfully conveyed the toolstring to the new target depth of 11,959 ft (3,645 m) for logging.
Both the Well Tractor 412 and CBL tools worked flawlessly and met the client’s objectives. Prior to Welltec’s e line conveyance solution was run a competitor had three failed attempts at high cost for the client. The Well Tractor 412 had one chance and a 100% success rate. The operation was accomplished in approximately 18 hours and the Well Tractor was activated to convey the tools over a distance of 3,609 ft (1,100 m).
TRACTORING DISTANCE: 3,609 FT (1,100 M)
MAXIMUM DEVIATION: 73°
MAXIMUM TEMPERATURE: 212°F (100°C)
Philip Neff, BP Ops Petro physicist, Luanda, Angola
“Please extend my compliments to your team for an excellent job on the bond logging out here last week. I was very impressed with their motivation/ participation in all aspects of the job from safety to execution. As well tolerating a difficult situation with the rumors and reluctance to run your tool that you all had to put up with by doing tests etc. I have great faith in your guys abilities after seeing this well and will pass on to our completions guys here.”