TrackMaster comprehensive whipstock sidetracking solutions are carefully reengineered solutions that provide more reliable tools for casing exits and openhole sidetracking. One TrackMaster solution is the TrackMaster Select modular whipstock sidetracking system.
The TrackMaster Select system is a modular tool configuration adaptable for applications from single or multiple casing exits and openhole sidetracking to offshore extended windows and multilateral wells. The redesigned mill features a cutting structure forged into the tool body, which incorporates superior cutting inserts brazed onto the blade. The result is a stronger, faster, and more reliable sidetracking system.
Reducing sidetracking time and increasing system reliability
The system features a single-piece mill with integral blades and a newly designed cutting structure with brazed cylindrical cutters. The forged body eliminates the welding process and the resulting heat effect, producing a much stronger mill with improved fatigue life. The IDEAS integrated dynamic design and analysis platform was used to design the cutting structure that incorporates superior cutters to make milling faster than ever. The whipstock retrievability has also been improved as the hook slot location is optimized and the new mill design can preserve the thickness at the top of the whipstock, providing a more reliable sidetracking system.
Digitally enabled for better planning and higher performance
Unique to the TrackMaster Select system is the ability to design an optimum BHA, model window geometry, and perform following string pass-through and milling simulations, as well as bending stress and downhole dynamics analysis. It enables better performance right from the planning stage and is supported by the DrillPlan digital well construction planning solution. Overall well planning is improved to ensure high performance and that the exit window expedites passage of the BHA.
Case Study
Revive an 80-year-old well in soft, shaly sand
An operator drilling in the Inglewood field, California, USA, decided to revive a well that was drilled in 1935 and had since been plugged and abandoned. However, the operator was uncertain about the feasibility of reviving the well mainly because of the soft, shaly sand and the shallow depth. After Schlumberger achieved a successful dual casing exit for the operator on another well, the operator’s interest in reviving the 80-year-old well was rekindled.
The main challenge was to sidetrack through three strings of casing. There were additional challenges to achieving the multistring casing exit required for this operation. One was the shallow depth of 565 ft. Another was the need to underream while drilling to 2,764 ft to open the 61/8-in hole to 7 in; this would assist running a 51/2-in production liner to the bottom of the well.
Mill through three strings of casing
Although the annular space between the 95/8-in and 133/8-in casing caused concerns, the plan was to mill through the three strings with a 61/4-in TrackMaster Select system and FasTrack mill set up in a bimill configuration. Both eccentric and concentric cases were simulated. A close watch was kept on parameter selection—speed, WOB, and torque—versus depth while progressing down the whip and engaging the second and then the third string on this multistring exit.
After the expandable anchor of the TrackMaster Select system was set, the entire whipface was milled—using the FasTrack mill in a bimill configuration—through all three casing strings and 20 ft of rathole. To complete the wellbore departure, a trip was made to pick up a 61/4-in FasTrack mill in a trimill configuration to clean up the window. The window had been milled down the whipface until the watermelon mill reached the toe of the whipstock slide. At that point, the directional assembly with the Rhino system reamer was positioned below the motor, and drilling continued to TD. The Rhino system reamer is designed with aggressive PDC cutter blocks, the ability to simultaneously drill and enlarge the hole, and a short length to limit its hindrance on the effective bit to bend of the motor.
Achieve multistring exit in one run
Prejob planning and the advanced whipstock system allowed the project team to adapt a singlestring, foot-by-foot parameter playbook to account for two outer strings and to mill through all three strings on the first attempt.
The well was brought back to production with less than 5 hours of milling time. A triple-string exit successfully cut through 7-in, 85/8-in, and 133/8-in casings in 3.63 hours using a TrackMaster Select system with an expandable anchor and FasTrack one-trip mill in bimill configuration. The successful multistring casing exit was followed by 0.75 hours of cleanup with a 61/4-in FasTrack one-trip mill set in trimill configuration.
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