<![CDATA[Scale found in production tubing is still a severe operational problem in the oil and gas industry. This shows the need for scale control using synthetic chemicals such as disodium ethylenediaminetetraacetate (Na2EDTA), hydrogen chloride (HCL), or hydrogen fluoride (HF). However, concerns about the environmental impact and sustainability of long-term use of synthetic materials promote the search for alternatives based on natural materials such as tannin. Therefore, this study aims to determine and compare the effectiveness of tannins from rambutan binjai (Nephelium lappaceum), rambutan nona (Nephelium mutabile), and mangosteen (Garcinia mangostana) peel extract as natural scale inhibitors against Na2EDTA performance. To achieve the objective, UV-Vis spectrophotometric analysis carried is out and shows tannin containing 20.91% (rambutan binjai peel), 21.14% (rambutan nona peel, and 21.58% (mangosteen peel). Laboratory tests are conducted with variations in tannin volume (5 mL, 10 mL, and 15 mL) as well as soaking times of 20 and 60 minutes in 20ml distilled water. The results showed that the increase in tannin volume addition and soaking duration is positively correlated with the decrease in scale mass. The highest performance is shown by mangosteen peel extract, which reduce scale by 0.132 grams (6.6%) at 15 mL in 60 minutes. For comparison, Na2EDTA under the same conditions reduces 0.176 grams (8.8%). These results show the potential of tannin-rich fruit peel extract as an environmentally friendly and sustainable scale inhibitor alternative for oil and gas production systems.]]>
