Within the framework of the all-union complex research program "World Ocean" under the economic contract with the Institute of Microbiology of the USSR Academy of Sciences, the development of borehole methods of sampling from glacial strata, which are suitable for their further microbiological study is underway.
In order to develop a technology that meets the requirements of deep wells in thick ice strata and provides the necessary degree of stabilization of the borehole walls during drilling and exploration, it is necessary to solve a number of theoretical and experimental problems associated with the study of ice behavior in the near-wellbore space of the well.
With increasing drilling depths, the rheological properties of rocks composing the borehole walls become increasingly important. As a result of unloading on the side of the borehole, passed in a stressed rock mass, a zone of redistribution of normal stresses ...
One of the problems of deep drilling is to maintain the stability of the rocks composing the walls of the borehole, both directly in the process of penetration, and during subsequent studies and works ...
The problem of wellbore stability occupies an important place in solving the problem of improving the efficiency of drilling in difficult geological conditions, determined mainly by the strength and rheological characteristics of rocks, the degree of their tension, temperature regime, etc. ...
С увеличением глубин бурения проходка скважин в ледниковом покрове резко осложняется, так как непрерывно сужается ствол вследствие ползучести льда в условиях возрастания горного давления и температуры. Так, при глубоком бурении на станции Восток в Антарктиде ползучесть льда стала проявляться с глубины 500 м при температуре льда -53°С ...
