Accession Number : AD0762355

Title :   Rotary Drilling and Coring in Permafrost. Part III. Deep Core Drilling, Core Analysis and Bore Hole Thermometry at Cape Thompson, Alaska,

Corporate Author : COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H

Personal Author(s) : Lange,G. Robert ; Smith,T. K.

Report Date : SEP 1972

Pagination or Media Count : 27

Abstract : Two holes were successfully drilled and cored to depths of 1000 ft and 1200 ft in the frozen mudstone of the Tiglukpuk formation at Cape Thompson, Alaska. Permafrost extends to a depth of approximately 1000 ft. The hole walls were successfully stabilized, even in zones of very weak rock, by the use of refrigerated diesel fuel as a drilling fluid, and frozen cores of good quality were taken with little difficulty. A thermistor cable was inserted in one of the holes and ground temperatures were measured to 1000 ft with a high order of accuracy and stability. Data required to predict accurate equilibrium temperatures were available one month following installation. (Modified author abstract)

Descriptors :   (*PERMAFROST, DRILLING), DRILLS, DRILLING MACHINES, ICE, ROCK, CUTTING FLUIDS, SAMPLING, THERMISTORS, ALASKA

Subject Categories : Snow, Ice and Permafrost
      Civil Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE