New Models of Brittleness Index for Shale Gas Reservoirs: Weights of Brittle Minerals and Rock Mechanics Parameters

2015 ◽  
Author(s):  
Yuan Hu ◽  
M. E. Gonzalez Perdomo ◽  
Keliu Wu ◽  
Zhangxin Chen ◽  
Kai Zhang ◽  
...  
Keyword(s):  
Rock Mechanics ◽  
Shale Gas ◽  
Brittleness Index ◽  
Gas Reservoirs ◽  
Shale Gas Reservoirs ◽  
New Models

Brittleness index prediction in shale gas reservoirs based on efficient network models

2016 ◽  
Vol 35 ◽  
pp. 673-685 ◽  
Author(s):  
Xian Shi ◽  
Gang Liu ◽  
Yuanfang Cheng ◽  
Liu Yang ◽  
Hailong Jiang ◽  
...  
Keyword(s):  
Shale Gas ◽  
Network Models ◽  
Brittleness Index ◽  
Gas Reservoirs ◽  
Shale Gas Reservoirs

scholarly journals Brittleness Evaluation in Shale Gas Reservoirs and Its Influence on Fracability

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 388 ◽  
Author(s):  
Yapei Ye ◽  
Shuheng Tang ◽  
Zhaodong Xi
Keyword(s):  
Shale Gas ◽  
Evaluation Method ◽  
Triaxial Compression ◽  
Horizontal Stress ◽  
Brittleness Index ◽  
X Ray Diffraction ◽  
Elastic Parameters ◽  
Gas Reservoirs ◽  
Shale Gas Reservoirs ◽  
Minimum Horizontal Stress

The brittleness index (BI) is a key parameter used to identify the desirable fracturing intervals of shale gas reservoirs. Its correlation with fracability is still controversial. There have been a variety of methods proposed that can estimate BI. The brittleness evaluation method based on stress-strain curves according to the energy-balanced law is the most suitable and reliable in this study. Triaxial compression test, optical microscopy and scanning electron microscopy (SEM) observation, and X-ray diffraction analysis (XRD) were performed on nine drill core samples from well SY3 located in the peripheral regions of Sichuan Basin, China. These tests further evaluated several commonly used methods (brittleness indices based on rock elastic parameters, rock mineral compositions) and determined the relationship between brittleness, rock elastic parameters, and the content of minerals. The results obtained indicate that for sedimentary rocks, a higher Young’s modulus reduces the brittleness of rock, and Poisson’s ratio weakly correlates with brittleness. Excessive amounts of quartz or carbonate minerals can increase the cohesiveness of rock, leading to poor brittleness. Furthermore, the most suitable fracturing layers possess a high brittleness index and low minimum horizontal stress.

Rock mechanics of shear rupture in shale gas reservoirs

2016 ◽  
Vol 36 ◽  
pp. 943-949 ◽  
Author(s):  
Jinghong Hu ◽  
Shigang Yang ◽  
Daoming Fu ◽  
Ray Rui ◽  
Yanlong Yu ◽  
...  
Keyword(s):  
Rock Mechanics ◽  
Shale Gas ◽  
Gas Reservoirs ◽  
Shale Gas Reservoirs ◽  
Shear Rupture

A Novel Model of Brittleness Index for Shale Gas Reservoirs: Confining Pressure Effect

2015 ◽  
Author(s):  
Yuan Hu ◽  
M. E. Gonzalez Perdomo ◽  
Keliu Wu ◽  
Zhangxin Chen ◽  
Kai Zhang ◽  
...  
Keyword(s):  
Shale Gas ◽  
Pressure Effect ◽  
Confining Pressure ◽  
Brittleness Index ◽  
Gas Reservoirs ◽  
Shale Gas Reservoirs ◽  
Confining Pressure Effect ◽  
Novel Model

scholarly journals Numerical Investigation of Multistage Fractured Horizontal Wells considering Multiphase Flow and Geomechanical Effects

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Jun Li ◽  
Yuetian Liu ◽  
Kecong Ma
Keyword(s):  
Rock Mechanics ◽  
Shale Gas ◽  
Early Stage ◽  
Gas Production ◽  
Phase Flow ◽  
Gas Reservoirs ◽  
Two Phase ◽  
Flow Process ◽  
Stimulated Reservoir Volume ◽  
Shale Gas Reservoirs

Hydraulic fracturing is a key technology in unconventional reservoir production, yet many simulators only consider the single-phase flow of shale gas, ignoring the two-phase flow process caused by the retained fracturing fluid in the early stage of production. In this study, a three-dimensional fluid–gas–solid coupling reservoir model is proposed, and the governing equations which involve the early injection water phenomenon and stress-sensitive characteristics of shale gas reservoirs are established. The finite element–finite difference method was used for discretisation of stress and strain equations and the equations of flow balances. Further, a sensitivity analysis was conducted to analyse fracture deformation changes in the production. Fracture characteristics under different rock mechanics coefficients were simulated, and the influence of rock mechanics parameters on productivity was further characterised. The stimulated reservoir volume zone permeability could determine the retrofitting effect, the permeability increased from 0.02 to 0.1 mD, and cumulative gas production increased from 18.08 to 26.42 million m3, thus showing an increase of 8.34 million m3, or 46%. The effect of Young’s modulus on the yield was smaller than Poisson’s ratio and the width and length of the fractures. Production was most sensitive to the length of the fractures. The length of the fracture increased from 200 to 400 m, and the cumulative gas production increased from 26.44 to 38.34 million m3, showing an increase of 11.9 million m3, or 45%. This study deepens the understanding of the production process of shale gas reservoirs and has significance for the fluid–gas–solid coupling of shale gas reservoirs.

Geomechanical Characterisation and Modelling Help to Unlock Shale Gas Reservoirs in the Southern Sichuan Basin

2013 ◽  
Author(s):  
Roger Yuan ◽  
Fa Dwan ◽  
Navpreet Singh ◽  
Liang Jin ◽  
Danny Soo ◽  
...  
Keyword(s):  
Shale Gas ◽  
Sichuan Basin ◽  
Gas Reservoirs ◽  
Shale Gas Reservoirs
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