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The use of HCl in sandstone formations was proved to be more damaging than removing the damage even after introducing different polymers gelling materials to enhance HCl diversion by increasing the viscosity of the acid.
Chelating agents diluted in low-salinity water performed better than that diluted in high-salinity seawater in removing the damage from both sandstone and carbonate cores. .
The impacted laminates were repaired by removing the damage area with a circular cutout and filled with a chopped short Kevlar/epoxy: the efficiency of the repair procedure and toughness of the repaired laminates were examined by repeated impacts on the repaired site.
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The question was whether one could remove the damage without damaging the painting.
The analysis of both scenarios shows that HEDTA chelating agent can remove the damage from heterogeneous horizontal sandstone wells.
Chemical etching is to use a suitable etchant to remove the damage layer of a machined sample.
Due to multiple stages of fluids-formation reactions during sandstone acidizing, the success rate to remove the damage is generally not according to the requirement.
Na3HEDTA reacts with carbonate in the sandstone cores and removes the damage, as confirmed in the results of the previous part.
HEDTA chelating agent showed good ability to remove the damage caused by drilling fluid from different sandstone cores with different permeabilities.
Many studies were conducted on chelating agents and confirmed their ability to remove the damage and create wormholes in carbonate cores.
After the discovery of HF acid in 1935, it was extensively applied on sandstone formation to remove the damage and to solve problems related to the sandstone drilling and production damage.
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CEO of Professional Science Editing for Scientists @ prosciediting.com