NSEA-SR-147 (North Sea)

CHALLENGE

A major operator in the UK North Sea could not gain access to the wellbore of a producing well due to scale build up in the wellhead “Christmas Tree” (XT), confirmed visually by camera.  They were looking for a treatment method that could effectively remove the scale without damaging any components of the wellhead.  

SOLUTION

Remove scale by pulsing downward using electro-hydraulic pulsing technology

• The BLUESPARK® 275 tool was run in on 3rd party wireline

• Heavy scale (~1.5” thick) was encountered in various sections of the XT

• Several runs were made to clear scale from the swab valve down past the Lower Master Valve (LMV)

• A camera was run post-treatment to confirm the scale removal and the condition of the XT

Before treatment image showing scale with an opening of ~2” in 5.125” wellhead ID

After treatment 4-section side-view image inside wellhead

CONDITIONS

• Depth: 35 m (120 ft)

• Temperature:  10 °C (50 °F)

• Treated Sea Water/TEG in wellbore

• Calcium Carbonate (CaCO3) scale

OUTCOME

• Up to 1.5” thick scale was removed over the treated intervals, as confirmed by camera images

• The customer now had access through the XT into the main wellbore

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Blue Spark Energy is paving the way towards a sustainable, dynamic oil & gas industry. As leaders in high-pulse powered wellbore remediations, we provide a revolutionary technology that is a safe, cost-effective, and efficient solution for forward-thinking energy providers.