A METHOD FOR SOLVING THE PROBLEM OF CORE FREEZING INSIDE A CORE PIPE WHEN DRILLING WELLS AT EXTREMELY LOW TEMPERATURES

The paper presents a method for solving the problem of freezing of the formed core to the inner walls of the core pipe during drilling of exploration wells by the core method with compressed air purging in the winter conditions of the Sakha Republic (Yakutia). In the process of doing this work, we studied the long-term experience of the engineering and survey company “ Arctic-Bur” LLC, which operates on the basis of the Department of Subsurface Use, Geological Exploration Faculty, North-Eastern Federal University, and is engaged in drilling operations all year round in the territory of the North-East of Russia. To solve the above problem, we proposed to improve the standard geological exploration equipment for core drilling by installing an additional core receiver made of a polymer material with low adhesion to moisture- saturated frozen and thawed soils inside the core pipe. As a result of the research and design, we developed an effective and practical way to solve the problem of core freezing to the inner walls of the core pipe, which does not require serious upgrades of existing equipment and large nancial investments. Our next step is to conduct full-scale tests of the proposed method of solving the problem on the basis of the company “Arctic-Bur” LLC.

well drilling, geological exploration, permafrost, core drilling, drilling equipment, mining machines and mechanisms, drilling with compressed air blowing, core drilling, extremely low temperatures, cryolithozone