فهرست نشریات علمی دسترسی آزاد ایران

Lost circulation of drilling mud is one of the most significant challenges during drilling operations, leading to time loss and increased costs. It is influenced by factors such as the lithology and composition of the formation, the pressure difference between the drilling mud hydrostatics and the formation, the type of drilling mud, and hydraulic conditions. In the Asmari Formation of the Maroun Oil Field in Iran, lost circulation commonly occurs due to natural fractures, cavernous structures, and drilling-related factors. Several methods exist to mitigate this problem, including the use of appropriate loss circulation materials (LCMs) and reducing the drilling mud density. In this study, oyster shell and nanographene are proposed as LCM additives for optimized oil-based drilling mud in the Maroun Oil Field, and the necessary experiments were conducted. This paper investigates the simultaneous use of oyster shell as a normal particle-sized material and nanographene as a nanoparticle-sized material to control mud loss. The results indicate that nanographene is unable to seal fractures larger than 0.04 inches, making its use for wider fractures uneconomical. Oyster shell is ineffective as an LCM for fractures wider than 0.08 inches but performs well in sealing fractures smaller than 0.08 inches.