Achieving uniform acid placement and uniform damage removal across long open hole wellbores is very difficult to achieve when using reactive acids. Residual damage, due to patchy damage removal with a conventional treatment, can not only impair initial production but can trigger the early onset of production related problems such as gas and water coning.
If a new well is flowed where there has been patchy damage removal, flow will initiate in open zones, the pressure drop will concentrate at these zones and diminish elsewhere along the wellbore. Removal of further residual damage by drawdown is unlikely, therefore, and production remains limited to the already flowing zones.
With Arcasolve™ the mud cake is not broken instantly. In fact in new wells the intact mud cake retains the Arcasolve™ fluid inside the wellbore enabling the entire open hole to be filled with treatment fluid – for example through the drill string after reaching TD.
Then during the soak period acidising and polymer breaking occur to give uniform mud damage removal across the entire wellbore face while other completion activities are occurring . The allows the whole wellbore to contribute to production and helps optimise production by draining more of the reservoir while minimising gas and water coning.
Placement of Arcasolve fluid and production after Arcasolve treatment is shown for a screenless completion below:
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