Calcium carbonate LCM damages certain formations in Qatar

Wells treated with calcium carbonate lost-circulation material induced permeability damage to formations in the Dukhan field of Qatar.This occurred despite the promising application of this treatment in other fields where it has become common to seal off productive zones with viscous brines loaded with a nondamaging and acidable material (calcium carbonate). Click here to enlarge imageTypical applications target the well-killing process for gas producers and water-dump flood injectors prior to the continuance of workover operations. The seal-off procedure uses a hesitation squeeze-off technique as wells are bull-headed with large volumes of high viscous brine loaded with degraded CaCo3 p...

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