Non-Darcy thermal-hydraulic-mechanical damage model for enhancing coalbed methane extraction

2021 ◽  
pp. 104048
Author(s):  
Zhanglei Fan ◽  
Dongsheng Zhang ◽  
Gangwei Fan ◽  
Lei Zhang ◽  
Shuai Zhang ◽  
...  
Keyword(s):  
Coalbed Methane ◽  
Damage Model ◽  
Mechanical Damage ◽  
Methane Extraction

A Rational Methodology for Determination of Service Life for a Delayed Coker Drum

2015 ◽  
Author(s):  
John J. Aumuller ◽  
Jie Chen ◽  
Vincent A. Carucci
Keyword(s):  
Service Life ◽  
Low Cycle Fatigue ◽  
Damage Model ◽  
Mechanical Damage ◽  
Damage Mechanism ◽  
Modern Trend ◽  
Cold Spot ◽  
Chromium Alloy ◽  
Cycle Fatigue ◽  
Service Environment

Delayed unit coker drums operate in a severe service environment that precludes long term reliability due to excessive shell bulging and cracking of shell joint and shell to skirt welds. Thermal fatigue is recognized as the leading damage mechanism and past work has provided an idealized description of the thermo-mechanical mechanism via local hot and cold spot formation to quantify a lower bound life estimate for shell weld failure. The present work extends this idealized thermo-mechanical damage model by evaluating actual field data to determine a potential upper bound life estimate. This assessment also provides insight into practical techniques for equipment operators to identify design and operational opportunities to extend the service life of coke drums for their specific service environments. A modern trend of specifying higher chromium and molybdenum alloy content for drum shell material in order to improve low cycle fatigue strength is seen to be problematic; rather, the use of lower alloy materials that are generally described as fatigue tough materials are better suited for the high strain-low cycle fatigue service environment of coke drums. Materials such as SA 204 C (C – ½ Mo) and SA 302 B (C – Mn – ½ Mo) or SA 302 C (C – Mn – ½ Mo – ½ Ni) are shown to be better candidates for construction in lieu of low chromium alloy steel materials such as SA 387 grades P11 (1¼ Cr – ½ Mo), P12 (1 Cr – ½ Mo), P22 (2¼ Cr – 1 Mo) and P21 (3 Cr – 1 Mo).

Numerical study of multi-branch horizontal well coalbed methane extraction

2018 ◽  
Vol 40 (11) ◽  
pp. 1342-1350 ◽  
Author(s):  
Yongpeng Fan ◽  
Cunbao Deng ◽  
Xun Zhang ◽  
Fengqi Li ◽  
Xinyang Wang
Keyword(s):  
Coalbed Methane ◽  
Horizontal Well ◽  
Numerical Study ◽  
Methane Extraction

A novel technology for enhancing coalbed methane extraction: Hydraulic cavitating assisted fracturing

2019 ◽  
Vol 72 ◽  
pp. 103040 ◽  
Author(s):  
Congmeng Hao ◽  
Yuanping Cheng ◽  
Liang Wang ◽  
Hongyong Liu ◽  
Zheng Shang
Keyword(s):  
Coalbed Methane ◽  
Novel Technology ◽  
Methane Extraction

scholarly journals Coupled Thermal-Mechanical Progressive Damage Model with Strain and Heating Rate Effects for Lightning Strike Damage Assessment

2019 ◽  
Vol 26 (5-6) ◽  
pp. 1437-1459 ◽  
Author(s):  
S. L. J. Millen ◽  
A. Murphy ◽  
G. Catalanotti ◽  
G. Abdelal
Keyword(s):  
Heating Rate ◽  
Thermal Loading ◽  
Damage Model ◽  
Applied Pressure ◽  
Mechanical Damage ◽  
Failure Criteria ◽  
Lightning Strike ◽  
Progressive Damage ◽  
Rate Effects ◽  
Progressive Damage Model

AbstractThis paper proposes a progressive damage model incorporating strain and heating rate effects for the prediction of composite specimen damage resulting from simulated lightning strike test conditions. A mature and robust customised failure model has been developed. The method used a scaling factor approach and non-linear degradation models from published works to modify the material moduli, strength and stiffness properties to reflect the effects of combined strain and thermal loading. Hashin/Puck failure criteria was used prior to progressive damage modelling of the material. Each component of the method was benchmarked against appropriate literature. A three stage modelling framework was demonstrated where an initial plasma model predicts specimen surface loads (electrical, thermal, pressure); a coupled thermal-electric model predicts specimen temperature resulting from the electrical load; and a third, dynamic, coupled temperature-displacement, explicit model predicts the material state due to the thermal load, the resulting thermal-expansion and the lightning plasma applied pressure loading. Unprotected specimen damage results were presented for two SAE lightning test Waveforms (B & A); with the results illustrating how thermal and mechanical damage behaviour varied with waveform duration and peak current.

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