WORLD RECORD – NONEXPLOSIVE CUTTER SEVERS PIPE IN 50 SECONDS

Well Cutter for medchanical solutions

Background

November 2015 – an operator in the North Sea was performing a workover needed to cut the 4 1/2” tubing at ~ 7,000 ft with an inclination of ~ 60 degrees. A caliper run prior to the operation showed barium sulfate scale deposits, both below and above the cut point with a minimum ID of 3.65”. The deposits were scattered above the cut point but transitioned to an increasingly solid layer below the target depth. Scale often poses challenges for explosive cutters, leading to partial cuts or very ragged cuts. Use of the Well Cutter® provided the opportunity to not only overcome the scale challenge but also to eliminate the need for a polishing run with drillpipe to dress the top of the cut pipe.

OPERATION

The Well Cutter was selected for this operation as not only could it overcome the scale challenge but also it could eliminate the need for a polishing trip with drillpipe to dress the top of the cut pipe. On location, Welltec® ran the 318 Well Cutter down to the target depth, correlated, and started the cut. In only 50 seconds, the pipe was severed with clear indications of the cut from several of Welltec’s indicators. These included output from an accelerometer and head tension which provided clear movement of the tubing with fixed toolstring inside as the pipe parted. Correlating this information with the tool current and voltage response gave clear evidence to the field engineer that the cut had been made in less than 1 minute.

ACHIEVEMENTS

This 50-second operation represents a new world record for the fastest cut made with the Well Cutter, despite the challenges posed by scale deposits. The entire operation was performed very efficiently and required only one field engineer on site. The engineer had data on hand during the job which provided real time confirmation of the operation, allowing the operator to begin focusing on the next steps instead of waiting to see the results. Creating a clean, polished cut enabled the operator to avoid a polishing trip with drill pipe, further increasing efficiency and driving down costs.

WELL DATA:
WELL TYPE: OIL PRODUCER
MAX. DEVIATION: 57°
MAX. DEPTH: 7128FT MD
TEMPERATURE 65 DEG C
CASING  4 ½” #12,6