Development of Drilling and Casing Technologies for Permafrost Areas

• Published in: IOP Conference Series: Earth and Environmental Science
• Main Authors: Atlasov, R, Nikolaeva, M, Karamzin, V
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: IOP Publishing 2019
• Subjects: permafrost
• Online Access: http://dx.doi.org/10.1088/1755-1315/272/2/022078; https://iopscience.iop.org/article/10.1088/1755-1315/272/2/022078/pdf; https://iopscience.iop.org/article/10.1088/1755-1315/272/2/022078

Abstract During the well drilling operations in permafrost there are a number of specific complications that often lead to serious accidents: soil bulging, destruction of wellheads, collapses of wells walls, breakage and crushing of casing columns due to inefficient cementing in the frozen soil, griffins, etc. The above-mentioned complications are predetermined by incorrect drilling and fastening of wells. The article gives the main recommendations that contribute to the successful wells completion in permafrost: 1. Construction of wells without descending shaft and elongated directions; 2. Drilling on low-temperature drilling fluids; 3. Drilling in the summer period by drilling bit of smaller size with the subsequent reaming to the required diameter; 4. Achieving the maximum commercial speeds.