WELL CLEANER®RCB ENABLES TOE PERFORATIONS BY CLEARING LATERAL OBSTRUCTION IN NORTH DAKOTA

Background

In January 2018, a client in North Dakota experienced a failed toe sleeve that prevented them from pumping down first stage perforating guns to start frac operations. Initially, Welltec® attempted to use the Well Tractor® to convey the perforating guns through the lateral to perforate the first stage. The Well Tractor® was engaged at 11,860 ft but could not move beyond 11,930 ft.  At this point, it was suggested that Welltec® rig up the Well Cleaner® Reverse Circulating Bit (RCB) Tool to clean out the lateral.

At the time, the RCB was already mobilized on site with the Well Tractor®, and the availability of coiled tubing units or a work over rig was limited. Welltec® was thus given the opportunity to clean out the lateral with the RCB.

OPERATION

Upon receiving approval to run the RCB, Welltec® performed surface checks and prepared the tools for the run. Once all parties were satisfied with surface preparation, the tool string was positioned into the lubricator and rigged up.
The tool string encountered debris at 11,810 ft at which point the Well Tractor® and RCB were both engaged. After 14 minutes, the up-hole monitor indicated that the wellbore was clear. The RCB was switched to “Off” mode, and the Well Tractor® was restarted in “High Speed” mode. The Well Tractor® successfully conveyed the tool string to 21,645 ft. Not yet to bottom, the RCB was re-engaged; it ran for approximately five minutes until the tool string current hit the high-current shutdown, at which point the tool string was within approximately 20 ft of the well’s total depth.
The tool string was brought to surface and rigged down where we discovered the bailers were 90% full of possible cement stringers and other miscellaneous well debris. An injection test proved that the RCB cleared enough debris from the well to allow the toe sleeve to operate as originally intended. Normal pump down perforating operations could then also continue as planned.

ACHIEVEMENTS

The RCB’s integrated rotating bit and the suction system broke through and removed the well’s obstructions in one run. With the lateral cleared, the client was able to pump down the perforating guns and frac the first stage.

As a wireline intervention, the RCB results in time and cost savings for the client. Welltec® was on site for a total of 23 hours, significantly less time—and money—than that required by either a coiled tubing unit or a workover rig. The RCB, running with the Well Tractor® further illustrates the robustness of Welltec’s wireline interventions that can help clients achieve their goals with less time, less cost and less risk than traditional alternatives.

WELL TYPE: OIL PRODUCER
BOTTOM-HOLE PRESSURE: 5100 PSI AT 11700 FT
BOTTOM-HOLE TEMPERATURE: 260°F AT 11700 FT
DISTANCE TRACTORED: 9,655 F

 

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The excellent results have demonstrated to the operator that Welltec’s cleanout solutions can deliver many of the objectives that they have for other wells; optimizing production without a workover rig or CT.