Geoscience-engineering Integration-based Formation Damage Control Drill-in Fluid (GEI-FDC-DIF): An Essential Technology for Successful Extraction of Deep Mid-high Permeability Sandstone Reservoirs

The impact of drilling-induced formation damage is often underestimated in deep mid-high permeability reservoirs, largely due to modest reductions in permeability reported by conventional evaluation methods. This study introduces an innovative geoscience-engineering integration-based formation damage control drill-in fluid (GEI-FDC-DIF) technology, specifically developed to mitigate the challenges posed by deep wells with open-hole completions. Utilizing comprehensive geological and engineering analyses, our methodology facilitates a multiscale space-time evaluation of formation damage, enabling precise quantification of its severity and evolution. Based on identified mechanisms, tailored GEI-FDC-DIF formulations and supporting process measures are developed to optimize formation damage control. Preliminary geological and engineering evaluations of the deep mid-high permeability sandstone reservoir highlight the acute risk of drilling-induced formation damage. Detailed quantitative analysis indicates fluid sensitivity and drill-in fluid induced permeability reductions ranging from 1.13% to 44.54% and 26.47% to 65.55%, respectively, with absolute permeability declines extending into the hundreds of millidarcys. Invasion depths of drill-in fluids reach 3.9 to 56.6 meters at 150 hours and 7.6 to 92.6 meters at 840 hours, underscoring significant formation damage predominantly caused by solid plugging, fluid sensitivity, incompatibility, and oil phase permeability reduction. Incorporating a blend of acid-soluble fiber bridging, oil-soluble deformable temporary plugging agents, and liquid drainage enhancers, the GEI-FDC-DIF significantly improves plugging efficiency and filtrate flowback. The development and deployment of GEI-FDC-DIF have shown superior formation damage control capabilities, as corroborated by both laboratory and field applications, underscoring its promising potential for future use.