At 8,291 ft (2,527 m) the Well Miller® 218 configured for scale removal was deployed and milled 46 ft (14 m) down to the Wireline Entry Guide (WEG), where the tool operator switched to logging mode to correlate the CCL in order to confirm the bottom of tubing; then the toolstring was returned to surface. The Well Miller for scale removal was combined with a Well Tractor® 218 to apply weight-on-bit and counter the reactive torque from the milling bit rotation. The milling operation was performed during water injection to push deposits away from the milling bit while milling to avoiding getting stuck.
This was the industry’s first electric line scale milling operation in the Middle East and North Africa. The scale removal operation increased the water injection by 15% with no well head pressure. This successful scale cleaning was performed in just one run with no downtime or LTIs and took less than half the time as the estimated time for a workover rig.
The Well Head Initial Pressure of 90 bar decreased to 1 bar atmospheric pressure because the surface pressure disappeared. The results of the subsequent PLT operation can be read in the case story: “New world record: 46,801 ft tractored in one run in open hole well”.
MAX. TEMPERATURE: 221° F (105°C)
MAX. DEVIATION: 89.72° @ 10,696 FT (3,260
TUBING DIAMETER: 4.5″ OD
MINIMUM RESTRICTION: 2.75″