Determination of Acid Formula To Overcome Scale Problems In “Maxi” Wells Using Solubility Test

Abstract

Scale is one of the main problems in oil and gas production, which can cause blockages in production pipes and reduce the efficiency of hydrocarbon extraction. This deposit is formed due to the precipitation of minerals in formation fluids, especially those containing ions such as calcium, magnesium, and iron. This study aims to identify the components of the scale formed in the MAXI well and determine the most effective acidification method to overcome this problem. The scale samples taken were analyzed using spectroscopy methods to determine their composition. Furthermore, solubility tests were carried out at room temperature and high temperature with various concentrations of hydrochloric acid (HCl) to evaluate their effectiveness in dissolving scale. The results showed that the main component of the scale is iron sulfide (FeS), which has a lower solubility in water. The solubility test showed that a 15% HCl solution at 60°C gave the best results with a solubility level of 87%, compared to lower HCl concentrations. Therefore, the acidification method using 15% HCl is recommended to be applied in MAXI wells to increase oil and gas production and reduce the risk of blockage due to scale