Features of Determining the Temperature Regime of the Drilling Wells in Permafrost

Abstract

Rational regulation of the thermal regime during wells drilling operations grows into an important practical task. Its successful solution largely determines the efficiency of the well construction and the fulfillment of its objective function.Under the influence of both high positive and negative temperatures surrounding the rock well, various kinds of complications and accidents often occur during drilling and fastening of wells. Productivity of drilling operations is sharply reduced and drilling costs are increased.When drilling various wells in areas of the Northeast and the Arctic zone of Russia with extreme natural and climatic conditions and a thick layer of permafrost the selection of optimal drilling tools and drilling technologies requires special requirements. Deposits of the permafrost zone have significant differences from analogs located in regions with a temperate climate and a positive temperature of rocks. Their specificity is due to the complex interaction and influence of mining-geological, permafrost and climatic factors. It has been established that the temperature factor determining the efficiency of the process of destruction and transportation of frozen rocks lies at the basis of the complicated conditions for rotary drilling of wells in permafrost.