Formulation and Evaluation of an Ethylenediaminetetraacetic-Enhanced Calcium Carbonate Scale Dissolver for Improved Efficiency in Oil Well Operations

Abstract Ethylenediaminetetraacetic (EDTA) has been to treat calcium carbonate (CaCO3) scale in oil and gas wells. EDTA enjoys an additional upper hand over regular acids, which affects metal well tubing, forestalls iron precipitation and high warm strength. Nonetheless, EDTA faces some challenges due to its solubility. In this study, a tri potassium (K3EDTA) calcium carbonate descaling fluid was created to overcome this limitation. A static disintegration test was performed with 4 grams of CaCO3 utilizing the gravimetric strategy at 60 °C for 24 hours. At last, the most disintegration productive dissolver was chosen and portrayed by ICP-OES for calcium particles distinguishing proof, pH, limit, thickness, and destructiveness. The results showed that 0.6 M EDTA controlled with potassium base produced 48.33 % disintegration. The result has produced a new compound dissolver (0.6 M K3EDTA + 0.2 M HCl + 0.3 M HAc) with 68.33 % disintegration and up to 20755 ppm absolute calcium particles. The new substance dissolver has a pH of 4.88, thickness of 1.121 g/mL and edge of boiling over of 101.1 °C, which are inside the CaCO3 business dissolvers range. In the meantime, a fair erosion pace of the new dissolver was shown at 18.031 mpy and is supposed to decrease with the guide of a little inhibitor fixation. The discoveries of this study might direct specialists to plan a predominant CaCO3 descale utilizing higher solvency chelating specialists in acids than EDTA with disintegration more than 70 %.