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Wang, Lei
- A Snapshot of Open Access Journals in Science
Abstract Views :385 |
PDF Views:124
Authors
Affiliations
1 Financial Research Department, Shanghai National Accounting Institute, Shanghai 200030, CN
2 Ingdo International Trading Group, Shanghai 200030, CN
3 School of Information Management and Engineering, Zhejiang University of Finance and Economics, Hangzhou 310018, Zhejiang, CN
1 Financial Research Department, Shanghai National Accounting Institute, Shanghai 200030, CN
2 Ingdo International Trading Group, Shanghai 200030, CN
3 School of Information Management and Engineering, Zhejiang University of Finance and Economics, Hangzhou 310018, Zhejiang, CN
Source
Current Science, Vol 111, No 7 (2016), Pagination: 1134-1135Abstract
Open access (OA) publishing which eliminates various restrictions on access has greatly changed the landscape of scientific publishing. OA publishing is now widely acknowledged to accelerate the knowledge production and dissemination. Accompanying the changing global research landscape, the volume of OA publications has also risen rapidly over the past decade.- Effect of Confining Pressure on the Mechanical Properties of Thermally Treated Sandstone
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PDF Views:138
Authors
Affiliations
1 State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, Hubei, CN
2 State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, CN
1 State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, Hubei, CN
2 State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, CN
Source
Current Science, Vol 112, No 06 (2017), Pagination: 1101-1106Abstract
To understand the effect of confining pressure on the mechanical properties of thermally treated coarse sandstone, uniaxial and triaxial compression tests were conducted for six groups of thermally treated sandstone from Xujiahe Formation in southwestern China under confining pressures of 0-40 MPa. The test results indicate that 600°C is a critical threshold of the thermal damage of sandstone by SEM and mechanical tests. When temperature is below 600°C, few micro cracks are observed by SEM. Peak strength, elastic modulus, cohesion and internal friction angle remain constant or increase with increasing temperature and all these values decrease when temperature is above or equal to 600°C under different confining pressures. Under the uniaxial and low confining pressure (≤ 5 MPa), the failure mode shows single or multiple splitting planes and it is easier to generate complex cracks with increasing temperature. Under high confining pressure (10-40 MPa), the failure mode shows a simple shear plane after treatment at different temperatures, i.e. 25-1000°C. The results may provide guidance for rock engineering design after high temperature exposure.References
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- Experimental Study on The Hydraulic Fracture Propagation In Shale
Abstract Views :336 |
PDF Views:113
Authors
Affiliations
1 School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan Province - 454000, CN
2 State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei - 430071, CN
3 Machay School of Earth Sciences and Engineering, University of Nevada, Reno, NV, US
1 School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan Province - 454000, CN
2 State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei - 430071, CN
3 Machay School of Earth Sciences and Engineering, University of Nevada, Reno, NV, US
Source
Current Science, Vol 115, No 3 (2018), Pagination: 465-475Abstract
To realize the control on geometry of fracture network and improve the individual well production of shale gas reservoirs, hydraulic fracturing simulation tests of shale outcrops for horizontal well were carried out. This was based on an established true triaxial hydraulic fracturing simulation test system, to analyse the propagation and formation of a complex fracture network. The results show that the typical severe fluctuation of pump pressure during extension, is an obvious feature of hydraulic fracturing by Stimulated Reservoir Volume (SRV). Due to the large size and abundant natural fractures in shale specimens, the acoustic emission (AE) energy is weak during propagation of hydraulic fractures. However, fracture propagation can still be effectively determined to some extent, although relatively few AE events are detected. Hydraulic fractures from horizontal well initiate approximately along the maximal in situ stress. But the fractures gradually deviate from the orientation when extending. Branching, re-orientation or penetrating bedding planes and then interconnecting with natural fractures or weak beddings are the main mechanisms of the formation of complicated fracture networks.Keywords
Fracture Propagation, Fracture Network, Hydraulic Fracturing, Shale, Stimulated Reservoir Volume.References
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- Effect of the Drilling Fluid on Hardness Characteristics of Tight Sandstone
Abstract Views :362 |
PDF Views:104
Authors
Affiliations
1 National and Local Joint Engineering Laboratory for Road Engineering and Technology in Mountainous Areas, Chongqing, CN
2 State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, CN
1 National and Local Joint Engineering Laboratory for Road Engineering and Technology in Mountainous Areas, Chongqing, CN
2 State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, CN
Source
Current Science, Vol 115, No 11 (2018), Pagination: 2015-2018Abstract
To understand the effect of the drilling fluid on hardness characteristics of tight sandstone, indentation hardness tests were conducted on tight sandstone which were soaked in a water- or oil-based drilling fluid at different temperatures and time. The results of the study indicate that: (1) the hardness of tight sandstone decreased rapidly after being soaked in the water-based or oil-based drilling fluid and it decreased by 22.9% and 10.1% respectively after two hours; (2) with the increase in soaking time, the hardness remained almost constant when soaked in the oil-based drilling fluid. However, the reduction in hardness reached 33.1% after soaking in the water-based drilling fluid for 15 days; (3) there was little change in the hardness with the increase in temperature in the oil-based drilling fluid, but in the water-based drilling fluid, the hardness decreased at a temperature above 50°C; (4) high temperature would cause mineral expansion and hydration, resulting in hardness reduction with increase in soaking time in the water-based drilling fluid which would lead to the softening of the tight sandstone’s surface structure.References
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