Mechanism of drilling rate improvement using high-pressure liquid nitrogen jet
HUANG Zhongwei,WU Xiaoguang,LI Ran,ZHANG Shikun,YANG Ruiyue
Table 2 The deterioration factors for elastic modulus (E) and uniaxial compressive strength (UCS).
Litho-
logy
Uniaxial compressive strength/% Elastic modulus/%
25 °C 150 °C 260 °C 25 °C 150 °C 260 °C
Shale 0.69 11.41 27.94 1.49 8.00 12.85
Sand-
stone
-24.39 -6.29 13.26 -17.01 -6.10 13.45
Granite 1.09 18.90 29.00 1.00 14.11 13.11