scholarly journals Shale Brittleness Index Based on the Energy Evolution Theory and Evaluation with Logging Data: A Case Study of the Guandong Block

ACS Omega ◽  
2020 ◽  
Vol 5 (22) ◽  
pp. 13164-13175
Author(s):  
Yuwei Li ◽  
Lihong Zhou ◽  
Dongping Li ◽  
Shengchuan Zhang ◽  
Fuchun Tian ◽  
...  
Keyword(s):  
Brittleness Index ◽  
Evolution Theory ◽  
Energy Evolution

scholarly journals Evaluation Approach of Rock Brittleness Index for Fracturing Acidizing Based on Energy Evolution Theory and Damage Constitutive Relation

Lithosphere ◽  
2021 ◽  
Vol 2021 (Special 4) ◽  
Author(s):  
Shaobo Jin ◽  
Xin Wang ◽  
Zhen Wang ◽  
Shaoyuan Mo ◽  
Fengshou Zhang ◽  
...  
Keyword(s):  
Constitutive Relation ◽  
Ph Value ◽  
Acid Corrosion ◽  
Strain Curve ◽  
Brittleness Index ◽  
Evaluation Methodology ◽  
Evolution Theory ◽  
Energy Evolution ◽  
Soaking Time ◽  
The Impact

Abstract Acidizing, as an essential approach for well stimulation of sandstone or carbonate reservoirs, greatly affects the brittleness of the rock mass. Therefore, it is of great significance to develop a scientific brittleness evaluation methodology for the acid-corroded rock. In this paper, firstly, a damage constitutive model considering the compression hardening process of the acid-corroded sandstone under uniaxial loading is established and verified. Then, the evolution formulae of the relevant mechanical and fitting parameters are derived, and the stress-strain curve of the sandstone subjected to acid corrosion with soaking time is predicted. Finally, a theoretical model for evaluating the brittleness index (BI) of the acid-corroded sandstone based on energy evolution theory and damage constitutive relation is proposed. Based on this model, the BI of the sandstone subjected to acid corrosion is calculated and analyzed, and the BI of the acid-corroded sandstone with the soaking time is predicted. Results show that the BI of the sandstone is negatively correlated with the soaking time, and the rate of descent of the BI decreases with the increment of the soaking time. In addition, the decline degree of the BI has a negative correlation with the pH value. On the other hand, the temperature (25°C, 50°C, and 75°C) has greater weakening effects on the BI compared with the impact of the pressure (5 MPa, 10 MPa, and 15 MPa). Besides, days 50 and 120 are two turning points where the decreasing rates of the BI change from rapid to slow and slow to almost constant, respectively. Furthermore, a coefficient (θ) is proposed to quantify the effect of the acid corrosion, and some suggestions are provided for the application of the acidizing treatment.

scholarly journals Rock damage evolution model of pulsating fracturing based on energy evolution theory

2020 ◽  
Vol 8 (4) ◽  
pp. 1050-1067 ◽  
Author(s):  
Yuwei Li ◽  
Yudong Zhao ◽  
Jizhou Tang ◽  
Liyuan Zhang ◽  
Yuyang Zhou ◽  
...  
Keyword(s):  
Damage Evolution ◽  
Evolution Model ◽  
Rock Damage ◽  
Evolution Theory ◽  
Energy Evolution

Inference in Social Evolution Theory: A Case Study

2021 ◽  
pp. 84-97
Author(s):  
John A. Byers ◽  
Marc Bekoff
Keyword(s):  
Social Evolution ◽  
Evolution Theory

Model approach to grammatical evolution: theory and case study

2015 ◽  
Vol 20 (9) ◽  
pp. 3537-3548 ◽  
Author(s):  
Pei He ◽  
Zelin Deng ◽  
Houfeng Wang ◽  
Zhusong Liu
Keyword(s):  
Grammatical Evolution ◽  
Evolution Theory ◽  
Model Approach

Brittleness evaluation of coal based on statistical damage and energy evolution theory

2019 ◽  
Vol 172 ◽  
pp. 753-763 ◽  
Author(s):  
Yuwei Li ◽  
Min Long ◽  
Lihua Zuo ◽  
Wei Li ◽  
Wanchun Zhao
Keyword(s):  
Evolution Theory ◽  
Energy Evolution ◽  
Statistical Damage
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