NSEA-SR-157 (Danish North Sea)

CHALLENGE

A major operator in Denmark needed to set one or more plugs in various sections of the well that had CaCO3 scale for a pre-P&A operation. A multi-finger caliper was run to assess the degree of the scale and the decision was made from the caliper log that the scale was severe enough that the BLUESPARK® treatment would be required.

SOLUTION

Remove CaCO3 scale from the inside of tubing using electro-hydraulic pulsing technology.

• The BLUESPARK® 275 tool was run on third-party E-Line.

• Three 20 ft (6m) deep and intermediate intervals were treated on the 1st run in the well at various pulse densities.

• The caliper was run again over the 3 intervals to determine the extent of the cleaning

• After the unsuccessful setting of a plug in a shallow zone which they attempted to clean with brushes, it was decided to use BLUESPARK® to treat the same shallow zone, which once completed, allowed the plug to be successfully set.

CONDITIONS

• Offshore conventional oil field

• Directional well

• CaCO3 scale

• Depth: 150 - 5650 ft (45 - 1720 m)

• Temperature: 62 °C (144 °F)

OUTCOME

• Four zones were successful cleaned with BLUESPARK® with the caliper logs showing significant removal of scale in each zone

• A deep and a shallow plug were successful set and tested

Intermediate Plug Set Zone A (cleaned at 60 ppf)

Intermediate Plug Set Zone B (cleaned at 30 ppf)

Deep Plug Set Zone (cleaned at 60 ppf)

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