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An effective way to solve this problem is to develop new plugging materials, which are in the nanometer or micrometer scale.
However, when drilling in the shale formation to obtain shale gas, new plugging materials should be developed.
One effective way to solve the block problem in the drilling of the shale formation is to search and develop the plugging materials with smaller size.
Experimental Materials.
So the sample 3 is probably the best candidate of plugging materials in shale formation.

The nanotechnology provides an impact on construction industry materials with new properties and produce material with better performance.
Nanotechnology has a great potential in the field of construction and building materials.
The basic concept behind using nano materials which are having large surface area may improve strength at early ages and hydration characteristics of cementitious materials.
A ball mill is a type of grinder used to grind materials to extremely fine powder by impact of balls.
Iyer, Role of nano oxides for improving cementitious materials, Journal of civil engineering and sciences, Volume 1, Issue 2 (2012), 52-58

Bergheau3D modeling of multi pass welding of a 316L stainless steel pipe Journal of Materials Processing Technology 153–154 (2004) 457–463 [4].
Hidekazu Murakawa , Dean Deng , Ninshu Ma, Jiangchao Wang Applications of inherent strain and interface element to simulation of welding deformation in thin plate structures Computational Materials Science 51 (2011) 43–52 [6].
Maropoulos Prediction of welding distortion in butt joint of thin plates Materials and Design 30 (2009) 4126–4135 [7].
Dean Deng , Hidekazu Murakawa Influence of transformation induced plasticity on simulated results of welding residual stress in low temperature transformation steel Computational Materials Science 78 (2013) 55–62 [8].
Sattari-Far Study on welding temperature distribution in thin welded plates through experimental measurements and finite element simulation Journal of Materials Processing Technology 211 (2011) 688–694

Based on materials mechanics, its maximum deflection in its within is (1) And its maximum deflection in its within is (2) When it is not surported by the central frame, this problem is the statical problem and its mechanical model is as shown in Fig.2.
Acknowledgements This work was financially supported by the Natural Science Foundation of Henan Province (2011C460002).
Chinese Journal of Mechanical Engineering, Vol 41 No. 2, (2005), p. 137～141 (in Chinese) [3] Liu Peiyue, Yan Zhibo.
Journal of Shijiazhuang Vocational Technology Institute, Vol 21 No. 4, (2009), p. 24～26 (in Chinese) [4] Domenico Umbrello.
Journal of Materials Processing Technology, Vol 196 No.1-3, (2008), p. 79~87 [5] Wen Xiaoshuo, Wang Keqi.

Materials and methods Materials.
The half time of melt reaction (t0.5) was defined as the time taken for one half of the materials to undergo melting reaction.
Shen: European Polymer Journal Vol. 39 (2003), p. 1935-1938
Du: journal of Biomedical Materials Research Part A Vol. 2006 (2006), p. 122-128
Paeng: Journal of Polymers and the Environment Vol. 16 (2008), p. 198-204

Characterization of chemical structure and surface properties for these materials was carried out and their efficacy in the catalytic ozonation degradation of wastewater was investigated.
Experimental 2.1 Materials Lemon yellow was purchased from Aldrich Chemical Company (Milwaukee, USA).
The morphology and microstructure characterization of the as-prepared materials were performed on the Nova Nano 450 scanning electron microscopy (SEM) with an accelerating voltage of 80 kV.
Chemical Engineering Journal, 242(15): 180-186
Environmental Science & Technology, 2009, 43(6): 2047-2053

Materials and Methods Materials.
Chemical compositions of materials Table 2.
Li, ACI materials journal, Vol.104 (6) 2007, p. 620-628
Li, ACI materials journal, Vol. 104 (3) 2007, p. 233
Ariffin, Construction and Building Materials, Vol. 30 (3) 2012, p. 281-288.

Acknowledgements This research was funded by Natural Science Foundation of Shandong Province(No.
Qian: Security Countermeasures against Terrorist Blast(Science Press, Beijing 2005)
Yang: Journal of System Simulation Vol.17(2005), p. 1059-1062
Yang: Explosive Materials Vol.33(2004), p. 63-66
Wei: The Chinese Journal of Geological Hazard and Control Vol.11(2000), p. 67-69.

Muto, Magnetic Impulse Welding of Aluminium Tube and Copper Tube with Various Core Materials, Welding International, 12 (1998) 619-626
Gafri, Magnetic pulse welding produces high- strength aluminum welds, Welding Journal, 81 (2002) 33-37
Okagawa, Application of Magnetic Pulse Welding for Aluminum Alloys and SPCC Steel Sheet Joints, Welding Journal, 86 (2007) 119s-124s
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Itoh, Optical Observation of Extremely High Impulsive Pressure Generator Using Collision of High Velocity Metal Jets, Materials Science Forum, 465-466 (2004) 265-270.

Materials and methods Preparation of SSI.
Chakraborty: Journal of Hazardous Materials.
Amirmahmoodi, et al.: Microporous and Mesoporous Materials.
Li: Journal of Environmental Sciences.
Li, et al.: Journal of Environmental Sciences.