Effects of supercritical CO2 adsorption on the mechanical characteristics and failure mechanisms of shale

Published on Apr 15, 2019in Energy6.082
· DOI :10.1016/J.ENERGY.2019.02.069
Gan Feng2
Estimated H-index: 2
(WHU: Wuhan University),
Yong Kang17
Estimated H-index: 17
(WHU: Wuhan University)
+ 2 AuthorsYaoqing Hu6
Estimated H-index: 6
(TUT: Taiyuan University of Technology)
Abstract This paper investigates variation in the failure behavior of shale in a ScCO2-immersion environment with different adsorption periods and layering orientations. Eight types of specimens are investigated, where the inclination of the layering to the applied force θ is 0°, 15°, 30°, 45°, 60°, 75°, 90°, and Divider type. The period of immersion ranges up to 60 days. The results indicate that after 60 days of ScCO2 adsorption, the Brazilian splitting strength (BSS), splitting modulus (E) and absorbed energy (U) of the shale were reduced by 46%, 22% and 50%, respectively, versus those of samples in which there was no adsorption. The root cause of this mechanical weakening is that damage done to the shale by ScCO2 results in the formation of a fragmented structure. Not only tensile failure but also shear failure occurs, making the failure mixed-mode. The mechanical properties of shale show clear changes with θ. Samples with no adsorption, 10-day adsorption, 30-day adsorption and 60-day adsorption show basically consistent change trends with inclination angle (θ).
📖 Papers frequently viewed together
428 Citations
1,318 Citations
5 Authors (Hong Yin, ..., Qili Liu)
80 Citations
#1Hongjun Li (ECUST: East China University of Science and Technology)H-Index: 7
#2Qinghua Chang (ECUST: East China University of Science and Technology)H-Index: 5
Last. Fuchen Wang (ECUST: East China University of Science and Technology)H-Index: 31
view all 7 authors...
In this study, an upgrading process of lignite with supercritical CO2 extraction under rather mild temperatures was studied as a possible method for producing clean solid fuel with less moisture and enhanced combustion reactivity. The fractal characteristics and reactivity evolution of two typical lignites during the upgrading process by supercritical CO2 extraction have been studied in present work. Two typical lignites and one subbituminous coal were extracted in different conditions by a semi...
15 CitationsSource
#1Evar C. Umeozor (U of C: University of Calgary)H-Index: 2
#2Sarah M. Jordaan (Johns Hopkins University)H-Index: 12
Last. Ian D. Gates (U of C: University of Calgary)H-Index: 30
view all 3 authors...
Environmental and economic impacts of methane escaping from the natural gas supply chain remain uncertain. Flowback emissions from hydraulically fractured natural gas wells are a key component of emissions from unconventional gas wells. While reduced emission completions in the United States are required by regulation, Canada’s proposed regulation will only be implemented in 2020 with the two highest producing provinces under exemption. To understand potential benefits of regulations, we use pre...
21 CitationsSource
#1Qiao LyuH-Index: 13
#2Xinping LongH-Index: 20
Last. Zhanghu Wang (CSU: Central South University)H-Index: 5
view all 6 authors...
Abstract Knowledge of the effect of carbon dioxide (CO2) on the mechanical properties of low-clay shales is essential to shale gas production and CO2 sequestration. In this paper, a series of uniaxial compressive strength (UCS) variable-time experiments were performed on low-clay shale samples saturated in sub-/super-critical CO2. The crack propagation process and micro scale variations were recorded by acoustic emission (AE) sensors with 3D ARAMIS technology and SEM tests together with EDS anal...
77 CitationsSource
#1Liang Huang (China University of Petroleum)H-Index: 12
#2Zhengfu Ning (China University of Petroleum)H-Index: 14
Last. Huibo Qin (China University of Petroleum)H-Index: 9
view all 7 authors...
Abstract Although research attentions for CO 2 injection in gas-bearing reservoirs have been drawn to CO 2 sequestration with enhanced gas recovery (CS-EGR), the microscopic competitive adsorption mechanism of methane (CH 4 ) and carbon dioxide (CO 2 ) considering the effect of organic type and moisture remains to be determined. In this work, we focus on the competitive adsorption behaviors of CH 4 and CO 2 on dry and moist realistic kerogen models of different organic types by performing combin...
130 CitationsSource
#1Gan Feng (WHU: Wuhan University)H-Index: 2
#2Yong Kang (WHU: Wuhan University)H-Index: 17
Last. Xiao-chuan Wang (WHU: Wuhan University)H-Index: 2
view all 5 authors...
Abstract To study the fracture toughness of sandstone, this study investigated the influence of temperature on the mixed-mode (I + II) and mode-II fracture toughness of sandstone using semi-circular bend (SCB) specimens. The results showed that temperatures above 500 °C significantly influenced mixed-mode (I + II) and mode-II fracture behavior. A comparison of experimental results with pure mode-I fracture toughness showed that the impact of temperature variations on the mixed-mode (I + II) and ...
27 CitationsSource
#1Alberto StrioloH-Index: 53
#2D. R. Cole (OSU: Ohio State University)H-Index: 2
Because of a number of technological advancements, unconventional hydrocarbons, and in particular shale gas, have transformed the US economy. Much is being learned, as demonstrated by the reduced cost of extracting shale gas in the US over the past five years. However, a number of challenges still need to be addressed. Many of these challenges represent grand scientific and technological tasks, overcoming which will have a number of positive impacts, ranging from the reduction of the environment...
60 CitationsSource
#1Hong Yin (Chongqing University)H-Index: 3
#2Junping Zhou (Chongqing University)H-Index: 11
Last. Guojun Liu (Chongqing University)H-Index: 4
view all 7 authors...
The interaction between carbon dioxide (CO2) and shale during the process of CO2 sequestration and shale gas recovery could significantly affect mechanical properties of the shale. In the current study, we performed experiments at 38 °C on shale samples from the Sichuan Basin aiming at investigating the effects of sub-critical CO2 (SubCO2) and super-critical CO2 (ScCO2) saturation on shale mechanics. Uniaxial compressive strength (UCS) test, X-ray diffraction (XRD) analysis, energy dispersive X-...
68 CitationsSource
#1Richard S. Middleton (LANL: Los Alamos National Laboratory)H-Index: 28
#2Rajan Gupta (LANL: Los Alamos National Laboratory)H-Index: 48
Last. Hari S. Viswanathan (LANL: Los Alamos National Laboratory)H-Index: 40
view all 4 authors...
Shale gas and hydraulic refracturing has revolutionized the US energy sector in terms of prices, consumption, and CO2 emissions. However, key questions remain including environmental concerns and extraction efficiencies that are leveling off. For the first time, we identify key discoveries, lessons learned, and recommendations from this shale gas revolution through extensive data mining and analysis of 23years of production from 20,000 wells. Discoveries include identification of a learning-by-d...
144 CitationsSource
#1Kaizhong ZhangH-Index: 6
#2Yuanping ChengH-Index: 46
Last. Wei Li (CUMT: China University of Mining and Technology)
view all 7 authors...
A systematic knowledge of the pore morphology of coal treated with supercritical CO2 (ScCO2) is critical for the process of CO2 geological sequestration. To better understand the desorption mechanism and to evaluate the storage capacity of target coal seams, the changes in pore volume, pore size distribution, fractal dimension, pore shape, and connectivity in high-, middle-, and low-rank coals were analyzed using N2/CO2 adsorption and mercury intrusion porosimetry. The results indicate that micr...
47 CitationsSource
#1Gan Feng (WHU: Wuhan University)H-Index: 17
#2Yong Kang (WHU: Wuhan University)H-Index: 17
Last. Xiaohong Li (WHU: Wuhan University)H-Index: 5
view all 5 authors...
This study investigated the influence of temperature on the mode I fracture toughness of sandstone using semicircular bend specimens. Fracture characteristics were studied using scanning electron microscopy and other means. The results showed that temperature influenced fracturing in three stages along a temperature gradient. In the low-temperature stage (20–100 °C), fracture toughness increases slowly, with a total increase of approximately 11%. At the medium-temperature stage (100–500 °C), fra...
45 CitationsSource
Cited By43
#1Yu Zhao (Guida: Guizhou University)H-Index: 2
#2Chaolin Wang (Guida: Guizhou University)H-Index: 3
Last. Jing Bi (Guida: Guizhou University)H-Index: 3
view all 5 authors...
Abstract null null In this paper, triaxial compression tests on coals with real-time T2 and MRI (Magnetic Resonance Imaging) image measurement are performed by using a nuclear magnetic resonance (NMR) testing system equipped with a loading device. Pore and fracture development in coal under stress conditions are investigated based on NMR and fractal theory. The results show that the accumulation of NMR signal intensity as well as sample porosity decrease slightly at first, then increase slowly, ...
#1Chao QinH-Index: 4
#2Yongdong JiangH-Index: 10
Last. Zhengjie LiuH-Index: 1
view all 6 authors...
#1An Qiyi (SDU: Shandong University)
#2Qingsong Zhang (SDU: Shandong University)H-Index: 9
Last. Li Mengtian (SDU: Shandong University)
view all 5 authors...
Abstract null null Relevant studies on the dynamic alteration damage caused to rock mechanical characteristics by supercritical carbon dioxide (SC-CO2) have not been performed because a suitable experimental apparatus is not available. A dynamic alteration damage apparatus was thus developed to study long-term SC-CO2/water/granite interactions. Several design modifications were introduced to realize functions that cannot be implemented using existing apparatuses, mainly involving dynamic reactio...
#1Shikha Sharma (WVU: West Virginia University)H-Index: 18
#2Vikas Agrawal (WVU: West Virginia University)H-Index: 6
Last. Angela GoodmanH-Index: 24
view all 6 authors...
One of the primary drivers of global warming is the exponential increase in CO2 emissions. According to IPCC, if the CO2 emissions continue to increase at the current rate, global warming is likely to increase by 1.5 °C, above pre-industrial levels, between the years 2030 and 2052. Efficient and sustainable geologic CO2 sequestration (GCS) offers one plausible solution for reducing CO2 levels. The impermeable shale formations have traditionally served as good seals for reservoirs in which CO2 ha...
#1Laura Edvardsen (SINTEF)H-Index: 1
#2Mohammad H. Bhuiyan (SINTEF)H-Index: 5
Last. Ruben Bjørge (SINTEF)H-Index: 12
view all 4 authors...
The Draupne shale is a rock formation functioning as overburden for gas reservoirs in the Norwegian Sea and potentially as caprock for future CO2 storage locations as well. In this paper, the Draupne shale was exposed to several fluids: CO2 gas, supercritical CO2, CO2 gas dissolved in brine, supercritical CO2 dissolved in brine, as well as brine and dry air. The motivation for the exposure tests was to investigate whether injected CO2 in a reservoir coming into contact with the caprock could cha...
#1Rafi Fawaz Mutar (University of Tikrit)
#2Muafaq Anhab Saleh (University of Tikrit)
Abstract null null Nano-bentonite was prepared from Iraqi bentonite clay by the co-precipitation method and the adsorption technique was used under many factors to determine the adsorption capacity (q) and removal% of arsenic ions (As) from the hospital's wastewater. The optimization process was conducted to choose the optimal parameters for adsorption and removal of arsenic by applying the central composite design (CCD) to form a surface response with three levels and three central points. Thre...
Last. Pierre CerasiH-Index: 12
view all 0 authors...
Carbon capture and storage (CCS) by geological sequestration comprises a permeable formation (reservoir) for CO2 storage topped by an impermeable formation (caprock). Time-lapse (4D) seismic is used to map CO2 movement in the subsurface: CO2 migration into the caprock might change its properties and thus impact its integrity. Simultaneous forced-oscillation and pulse-transmission measurements are combined to quantify Young’s modulus and Poisson’s ratio as well as P- and S-wave velocity changes i...
#1Qiao LyuH-Index: 13
#2Jingqiang TanH-Index: 17
Last. Ruining Hu (CSU: Central South University)H-Index: 2
view all 12 authors...
The development of hydraulic fracturing and horizontal drilling techniques has promoted the exploitation of shale gas resources. However, using water has several potential drawbacks including environmental issues, e.g., the contamination of groundwater, surface water, and soil. Supercritical carbon dioxide (SC-CO2), with its special physical properties, has shown potential to enhance shale gas recovery replacing water as the stimulation fluid. This review summarizes the current status of shale g...
3 CitationsSource
#1Bing Bai (China University of Petroleum)
#2Hongjian Ni (China University of Petroleum)H-Index: 8
Last. Lu Ding (China University of Petroleum)H-Index: 3
view all 5 authors...
Abstract The interactions between supercritical carbon dioxide (ScCO2) and shale significantly affect shale reservoir exploitation. This study investigates the effect of ScCO2 immersion on the mechanical behavior and microstructure of shale with inclined layering. The orientations α of the bedding plane with respect to the horizontal direction were 0°, 30°, 45°, 60°, and 90°. Mechanical experiment results indicated that the compressive strength of shale decreased, while the elastic moduli increa...
#1Junping Zhou (Chongqing University)H-Index: 11
#2Shifeng Tian (Chongqing University)H-Index: 3
Last. Zhaohui LuH-Index: 3
view all 8 authors...
Abstract The effect of fluid-shale interaction on the mechanical behavior of shale is of great significance for the safety of long-term CO2 sequestration in shale formations. In this paper, uniaxial compression and Brazilian splitting tests were conducted to the examine the mechanical alterations of shale caused by various fluids (brine, subcritical CO2, supercritical CO2, subcritical CO2+brine and supercritical CO2+brine) soak. After soaking in various fluids at 45°C for 10 days, the uniaxial c...