Driving Well Drilling Efficiency by Leveraging Indonesia Advanced Micronized Natural Fiber to Mitigate Loss Circulation and Preserve Reservoir Integrity

Abstract Advanced Micronized Natural Fiber (AMNF) has been specifically developed to address the challenge of loss circulation, particularly in reservoir zones. This study focuses on its application in the Alpha Formation, located in the Middle East. A case study was conducted on Well X, the first appraisal well situated 16 km northeast, with a total vertical depth subsea of 14,987 ftTVDSS. Offset well data revealed that drilling through the Alpha Formation, characterized by microfracture siltstone, often results in loss circulation, as the formation also serves as a reservoir zone. The Alpha reservoir spans 100 up to 1000 ft in gross thickness, with 20 up to 350 ft of net pay. To address these challenges, AMNF is used as a loss circulation material (LCM), focusing on its performance and advantages. AMNF derived from natural materials, offers an environmentally friendly solution by minimizing contamination and residue after drilling. It has been proven effective in mitigating loss circulation without damaging reservoir formations. This study compares the performance of AMNF as a LCM against traditional calcium carbonate (CaCO₃), based LCMs using a drilling mud system. Laboratory results show that AMNF forms a thin layer of impermeable barrier and prevents penetration, thereby minimizing fluid invasion. The sealing mechanism of sealant materials with defined elastic modulus, structured materials supported by hardness and crushing strength, and bridging materials possessing a modulus rupture and crushing strength are indicative of their mechanical stability under stress. Furthermore, from Scanning Electron Microscope (SEM) analysis illustrates the mechanism by which the AMNF barrier functions. The AMNF material forms a dense, interwoven structure of fibrous elements that effectively trap fine solid particles within its matrix. This fibrous network creates a robust and impermeable barrier that prevents fluid invasion into the formation. This mechanism reduces fluid loss and protects the reservoir from potential damage, enhancing wellbore stability during drilling operations.