Water Management Case 1920 X 1080

Downhole water management

  • MAX. DEPTH
    12,300 – 12,400 ft
  • MAX. DEVIATION
    68°
  • MAX. TEMPERATURE
    194°F

Background

Welltec’s downhole mechanical services enable enhanced production from mature fields to prolong the life of wells and increase productivity. A wide range of services are available including removal of obstructions such as scale and fll, reducing gas to oil ratio and isolating water-producing zones as illustrated in the case below. A well in the North Sea producing since 1995 was isolated with tubing that included two sliding side doors (SSD) to control production. Attempts had been made to close both SSDs in 2003, but only the upper SSD had closed. A two-piece straddle assembly was set above the lower SSD, which, however, did not change production. A PLT test showed there was an internal leakage in the tubing. In 2006, the straddle was retrieved and the well temporarily plugged.

Operation

The operator decided to apply Welltec’s downhole mechanical services. The Well Tractor® and Well Stroker® were used to isolate the lower sliding side door with a 72 ft long straddle assembly and to isolate the hole in the tubing above the lower straddle with a 26 ft straddle.

Achievements

The four-run operation was successful; the 85% water rate was reduced to 5% and the oil production went from 1258 BOPD to 5660 BOPD.

Tools Applied

  • Well Stroker®

    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 by the use of a bi-directional hydraulic ram.

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  • Well Tractor®

    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.

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