Arian Velayati
Research Institute of Petroleum Industry
Tehran
Iran
Title: Assessment of thixotropic agent effect on controlling gas migration through cement slurries following a detailed checklist
Biography
Biography: Arian Velayati
Abstract
Gas migration through cement slurry is a worldwide challenge. Gas invasion could lead to financial damages and fatal incidents. Major oil companies devised specially designed approaches to face the problem of gas migration, many additives have been introduced and several techniques have been utilized. We have reported on the effect of thixotropic agents on reducing transition time, critical hydration time, modification of the gel strength profile and generally prevention of gas migration through cement slurries. The research was conducted based on a detailed checklist for cement slurry design optimization. Resulted paper was published in journal of natural gas science and engineering (Elsevier). The results of the research indicate advantages of thixotropic agent utilization in cement slurry composition and facing the problem of gas migration. As the final stage of the slurry optimization plan the results were verified using fluid migration analysis (FMA) test. According to the results, total gas migration flow rate of cement slurry optimized using the presented checklist was recorded as 0.23 ml/min. It was also observed that thixotropic agents improved gel strength profile, filtration control, waiting on cement time (WOC) , critical hydration time and cement transition time significantly.