Milling out malfunctioning lubricator valve
WELL TYPE4-1/2” single completion
TOTAL DEPTH10,499 ft. (3,200m) MD
MAX. TEMPERATURE194°F (90°C)
BHP1,300 psi @ 6,985 ft (2,129m)
On one of these wells a malfunctioning lubricator valve would only open at ~80 percent. The faulty valve eliminated running perforation guns and obstructed future interventions; hence, they needed it removed.
The operator decided to use this well as a pilot for future hardware milling operations. Desiring a financially feasible, highly accurate, low risk solution, which would be easy to mobilize, they turned to Welltec® due to our proven track record and service quality demonstrated through successful collaboration on previous projects.
Conveyed by a Well Tractor®, the toolstring successfully milled the malfunctioning lubricator valve and restored access to the well with substantial cost savings and lower risk compared to coil tubing. Both upper and lower valve coupons were retrieved in two successive runs with the aid of a special ‘catcher design’ in the inner core of the bit. The operator then did a drift run with a 4.515 in. tubing swage and recovered the 4.51 in. X-lock from the X-nipple below the lubricator valve. Access was successfully restored for re-perforation and future interventions.
The operation took a total of six days incl. slickline operations, saving more than a week compared to CT operations and with considerably fewer resources. The milling job itself took a day with an actual milling time of ~two hours.
There were no misruns or lost time incidents. The operator is now able to perform a perforation operation which will increase the production from this well by an estimated eight MMscf/D.
The operation took a total of six days incl. Slickline operations, saving more than a week compared to CT operations and with considerably fewer resources.
Deployed on e-line, our modular milling tools have proven to be robust and highly effective in removing well components that are malfunctioning or no longer required with robotic precision.
The Well Tractor® was regarded as a revolution in the industry when it was introduced in the 1990’s. It enables operators to extend the reach of traditional e-line deployment into highly deviated and horizontal wells.
Welltec Release Device® (WRD®) is a simple tool which adds versatility and risk reduction to the operation. It provides predetermined locations in the toolstring where it can be parted, should it become stuck.