极寒环境下岩心地质钻探施工难点与对策OA

Based on the characteristics of extremely cold environments and actual drilling construction,drilling construction process poses great challenges to personnel health,equipment performance,maintenance of flushing fluids,and waterway security.This paper conducts an in-depth analysis of issues such as waterway icing,equipment freezing,performance degradation of flushing fluid,and frostbite of construction personnel in extremely cold low-temperature environments.Targeted technical measures,such as optimizing wellbore design,selecting suitable drilling greases,paying attention to flushing fluid circulation,and enhancing thermal insulation,were implemented at ZK17-1 drilling site in Longshoushan,Gansu Province in an extremely cold environment of-25℃has been well applied,with no personnel frostbite,drilling equipment freezing damage or significant decline in flushing fluid performance.The construction efficiency has been greatly improved,the downtime rate has been reduced to 2.17%,the monthly efficiency has increased by more than twice,and the drilling task has been completed with high quality and efficiency.The methods and countermeasures for difficulties of core drilling in extremely cold environments can provide some reference for other units to carry out drilling construction in similar environments.