Opening new flow path in expandable sand screens - 36 holes drilled in one run
WELL TYPEOil producer
MAX. DEPTH10433 ft MD
The client needed to open new access points to the production flow channels by mechanically punching the base pipe at the channels. The client requested an engineered solution that would allow the well to regain a more normal production level. To avoid accidental sand production, the screens themselves could not be milled or damaged. Additionally, the client requested that the holes be distributed axially to cover as much sand face as possible.
The client first tried other service providers but was not satisfied with the results. The drilled holes were not oriented as expected because of a complicated dual telemetry system that would lose orientation when activating the drilling on the high side.
Welltec® proposed a solution and created an orientation system that was sponsored by the client.
The required flow rate and the 12 mm bit size determined the number of holes needed for the operation. The depth of the drill bit was limited to avoid accidental damage to the screen outside. The Rotation Sub was produced and tested to provide orientation of the bit in 30° steps.
After the other service providers’ solutions failed, Welltec mobilized and performed the operation using the new system.
During a single run, the Welltec® Puncher correlated and drilled 36 holes of 12 mm each in diameter:
12 holes at 10.438 ft in the third screen.
12 holes at 10.400 ft in the second screen.
12 holes at 10.358 ft in the first screen.
The 12 mm diameter holes provided approximately 50% larger flow area than alternative solutions, and alternating “high” and “low” positions of the holes minimized reduction in mechanical properties. After the operation, the drill bit was in good condition.
The production experienced an initial boost to the previous production levels with less than half the stroke setting after implementing Welltec’s new system.
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.
The Well Stroker® can push or pull multiple times in the same run irrespective of the depth and deviation. It delivers up to 100,000 lbs of axial force downhole using a bi-directional hydraulic ram.
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.
The Welltec® Puncher provides an efficient, e-line conveyed, non-explosive method for equalizing pressures between tubular strings. Its innovative design quickly creates a large diameter hole in the tubular at the target depth
The Welltec® Hardware Scanner (WHS) is a part of the Welltec diagnostic tools family. It measures the relative changes to the magnetic field caused by the changes in the magnetic surroundings.