A novel statistical approach for prediction of thermal conductivity of CO2by Response Surface Methodology

2019 ◽  
Vol 527 ◽  
pp. 121175 ◽  
Author(s):  
Hossein Rostamian ◽  
Mohammad Nader Lotfollahi
Keyword(s):  
Thermal Conductivity ◽  
Response Surface Methodology ◽  
Response Surface ◽  
Statistical Approach

Laboratory Investigation of Bit Bearing Temperatures in Rotary Drilling

1986 ◽  
Vol 108 (3) ◽  
pp. 221-227 ◽  
Author(s):  
M. G. Karfakis ◽  
R. W. Heins
Keyword(s):  
Wear Resistance ◽  
Response Surface Methodology ◽  
Response Surface ◽  
Laboratory Investigation ◽  
High Temperatures ◽  
Statistical Approach ◽  
Bearing Material ◽  
Rotary Drilling ◽  
Test Conditions ◽  
Geothermal Drilling

One mechanism of bit failure in geothermal drilling is thought to be directly related to the overheating of the bearings. High temperatures alter the microstructure of the bearing material and reduce its wear resistance. This paper presents a laboratory study on bit bearing temperatures in rotary drilling using a two-roller cone micro-bit drill rig and a statistical approach referred as response surface methodology. The effects of the drilling variables on bearing temperatures were investigated. The range of bearing temperatures for the test conditions under study was determined. A second-order bearing temperature predicting equation is presented.

Sign in / Sign up

Export Citation Format

Share Document