Temperature Distribution in the Borehole drilled in Frozen Formation —PartⅠ of the Subject on Drilling in Frozen Formation

Abstract:

The significance of the temperature distribution in the borehole drilled in frozen formation is analyzed. The mathematic model of the borehole temperature distribution is presented. The temperature increment caused by rock fragmentation is calculated. And the condition preventing the borehole from collapse is put forward.

Key words:gas hydrate; frozen formation; temperature in borehole; borehole collapse