Optimized multi-stage ‘plug & perf’ in the rockies
Total depth21,750 ft (6,629m)
Max. dogleg17.85°/100 ft
Bottom hole temp.280°F (138°C)
Bottom hole pressure7,514 psi (51.8 MPa)
Well head pressure2,200 psi (15.2 MPa)
Total distance tractored146,608 ft (44,686m)
Due to casing issues the operator had previously installed a patch with an inner diameter of 3.6″ in a 4 1/2″, 11.6# casing string at 11,689 – 11,709 ft. (3,562-3,569m) in the horizontal liner of an oil well in the Bakken formation, North Dakota. Conventional methods were deemed unsuitable. Due to the restricted inner diameter of the patch, the operator could not pump the 4 1/2″ plug and was concerned that it would set prematurely or get pumped off causing an expensive fishing job.
Rig workover would have been too costly and time-consuming due to the number of zones, and a 2″ coiled tubing string would only be able to reach ~17,000 ft (~5,180m) omitting the lower 10 zones. Road weight restrictions complicated the logistics and it was doubtful that a rig or CT unit could make it to the well site. The operator had worked with Welltec on previous jobs in similar Bakken wells and had high confidence in the Well Tractor®, which made this solution an obvious choice.
This job went very smoothly. We were under the gun to get this well on production asap, and the well tractors enabled us to do this in a timely manner.
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.