The workover was done without a jack-up rig or coiled tubing. The WASP® tool was deployed on the operator’s preferred wireline provider’s E-Line from the platform, prior to the jack-up’s arrival. The treatment was performed at 5,800 ft. MD in a section of the wellbore that was at 30° deviation. Two 20-foot intervals were treated in one wireline run in less than 4 hours of treatment time.
A multi-finger caliper (MFC) log was performed on wireline to verify the scale removal. The caliper log (see Figure 1) confirmed that the WASP® had completely removed the CaCO3 scale from the inside of tubing over the two treated sections. Subsequently, the plug was set across the WASP® treated tubing interval and pressure tested successfully. The tubing cut was also completed successfully at the WASP® treated tubing interval, and on recovery of the tubing it was shown that all the scale had indeed been removed from this interval.
As a result of using WASP® to clean the sections of tubing:
- Coiled Tubing was not required, eliminating the cost of that service – mobilisation, rig-up, rig-down and reduced crew.
- There was a reduction of 8 days of jack-up rig time, as the WASP® operation was performed offline.
- The workover required no chemicals, explosives or controlled goods, and as such was environmentally friendly and extremely safe.
- The workover to remove scale inside tubing was completed in a very cost-effective and efficient manner.
This customer has also used WASP® to remove scale in other completion equipment, including Sub-surface Safety Valves, Side Pocket Mandrels, and Gas Lift Valves.
- Region: North Sea
- Topic: Intervention
- Month: January
- Year: 2018
- Content Type: Case Study