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