Welltec’s tools were used successfully for two runs during this operation: the first run with the Welltec® Puncher, and the second run with the Well Cutter®
The misrun with the ballistic puncher was thought to have occurred because it is required to fire in the direction of the interface with the tubing. This positioning was an issue because of the well’s 54° deviation. The Welltec® Puncher, however, has independent setting arms which ensure that the drilling face is always adjacent and pushed up against the tubing it is to drill through. The Welltec® Puncher is a non-explosive tool that equalizes the pressures between tubular strings by drilling a large 12 mm hole in the tubing at target depth.
To achieve the correct positioning, Welltec® used a modified centralizer mounted on a three-foot spacer above the Welltec® Puncher and Welltec Hardware Scanner (WHS). The WHS monitored and confirmed the orientation of the drill bit during the run. It took just 50 seconds for the first hole to be drilled. All 16 required holes were drilled in under three hours. The average drilling time by hole was approximately 40 seconds.
The Well Cutter® was then rigged up with a casing collar locator and run in hole. The position was correlated and the Well Cutter® engaged while the tubing was under compression. The cut took only 42 minutes.
Welltec’s tools achieved the client’s objectives by punching 16 holes in the tubing during one run, a new record for the Welltec® Puncher. Then, the Well Cutter® made an efficient, clean cut that left an angled entry guide for future runs in the lower completion.
The Welltec® Puncher succeeded generating a flow path with controlled position of equal size and penetration depth holes. This capability introduces new technology opportunities for well intervention, maximizing the likelihood of achieving good circulation.
Ultimately, using Welltec’s tools, especially the non-explosive Welltec® Puncher, resulted in a safer hole-punching and cutting option for the client.
TUBING PUNCHED AND CUT: 7” 32 ppf, L80, 13Cr
PRESSURE: 422 bar
PUNCH DEPTH: 3828.7–3824.2 m, hole 1–hole 16
CUT DEPTH: 3837m
MAXIMUM DEPTH: 21,850 ft MD