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Jiang S.L.,China University of Geosciences | Jiang S.L.,China Huadian Engineering Co. | Zeng C.L.,Chongqing Institute of Geology and Mineral Resources | Wang S.X.,Chongqing Institute of Geology and Mineral Resources | Li M.,Shandong Shengli Vocational College
Advanced Materials Research | Year: 2014

In order to carry out a more comprehensive discussion on shale gas accumulation conditions of Lower Cambrian Shuijingtuo Formation and Upper Ordovician Wufeng Formation-Lower Silurian Longmaxi Formation, the distribution, source rock conditions and reservoir conditions of these two shales are comprehensively analyzed, these two shales are both have the characteristics of high organic carbon content, high maturity, appropriate thickness and mainly type I kerogen as source rocks, and interbedded with siltstone and/or fine sandstone, rich in quartz and other detrital components, easy to break and form the cracks, micro cracks as reservoirs, these characteristics provide a favorable material basis and reservoir space for shale gas accumulating. On this basis, the effective distribution areas of these two shales are further determined and shale gas resources are preliminary evaluated, eventually come to the results of shale gas resources of Lower Cambrian Shuijingtuo Formation and Upper Ordovician Wufeng Formation-Lower Silurian Longmaxi Formation respectively are 0.409×1012m3 and 0.389×1012m3. © (2014) Trans Tech Publications, Switzerland. Source


Huang W.-A.,China University of Petroleum - East China | Huang W.-A.,University of Western Australia | Qiu Z.-S.,China University of Petroleum - East China | Cui M.-L.,Shandong Shengli Vocational College | And 3 more authors.
Petroleum Science | Year: 2015

In order to overcome serious instability problems in hydratable shale formations, a novel electropositive wellbore stabilizer (EPWS) was prepared by a new approach. It has good colloidal stability, particle size distribution, compatibility, sealing property, and flexible adaptability. A variety of methods including measurements of particle size, Zeta potential, colloidal stability, contact angle, shale stability index, shale dispersion, shale swelling, and plugging experiments were adopted to characterize the EPWS and evaluate its anti-sloughing capacity and flexible adaptability. Results show that the EPWS has advantages over the conventional wellbore stabilizer (ZX-3) in particle size distribution, colloidal stability, inhibition, compatibility, and flexible adaptability. The EPWS with an average particle size of 507 nm and an average Zeta potential of 54 mV could be stable for 147 days and be compatible with salt tolerant or positive charged additives, and it also exhibited preferable anti-sloughing performance to hydratable shales at 77, 100, and 120 °C, and better compatibility with sodium bentonite than ZX-3 and KCl. The EPWS can plug micro-fractures and pores by forming a tight external mud cake and an internal sealing belt to retard pressure transmission and prevent filtrate invasion, enhancing hydrophobicity of shale surfaces by adsorption to inhibit hydration. The EPWS with flexible adaptability to temperature for inhibition and sealing capacity is available for long open-hole sections during drilling. © 2015, The Author(s). Source


Chen Q.,China University of Petroleum - East China | Liu Y.,China University of Petroleum - East China | Liu Y.,Shandong Shengli Vocational College | Feng J.,China University of Petroleum - East China
Journal of Networks | Year: 2013

A new method is used to quantify the relationships between stress field and primary fracture characters (aperture, density) in low-permeability sandstone reservoirs based on laboratory experiments and mathematical development, through which, quantitative fracture modeling is set up. Using this modeling, we can load it into the stress analysis software (Ansys 10.0) to acquire 3D palaeo stress field and current-stress field after selecting appropriate mechanical parameters and stress loading. © 2013 ACADEMY PUBLISHER. Source


Lei J.,Beijing Electronic Science and Technology Institute | Lei Z.,Shandong Shengli Vocational College
Proceedings - 2011 International Symposium on Intelligence Information Processing and Trusted Computing, IPTC 2011 | Year: 2011

This paper studied the chaotic cipher based on CNNs chaotic equation and its application in the network environment. Firstly, a improve method for CNNs chaotic properties was given, the variables which has better statistic property and more sensitive to the system parameter be get to generate binary sequence for encrypt. And then, for applying chaotic cipher in network environment, the synchronization method based on the state variables transmission mechanism was proposed, this method can solve the synchronization problem of chaotic stream cipher, and the simulation test results confirm the validity. At last, a chaotic cryptosystem key distribution strategy in network environment was designed. © 2011 IEEE. Source


He L.-M.,China University of Petroleum - East China | Yang D.-H.,China University of Petroleum - East China | Luo X.-M.,China University of Petroleum - East China | Li D.-Q.,China University of Petroleum - East China | Yang F.,Shandong Shengli Vocational College
Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | Year: 2011

The insulated high voltage electrode and four types of electrostatic coalescers were designed and made. By using the micro high-speed camera system and image processing technology, the coalescence characteristics of water droplets at AC electric field were studied with water in crude oil emulsion. The effects of electric field intensity, number of electrode layer and electrode spacing on water droplets coalescence were investigated. The results show that the insulated high voltage electrode can effectively prevent electric breakdown. High electric field intensity and long residence time are conductive to water droplets coalescence, but if the electric field intensity is higher than critical one, the water droplets will rupture. If the electric field intensity is high enough to promote droplet coalescence, the number of electrode layer is not important. But the coalescer with multielectrode can enhance the flow rate and more economical. When electrode spacing is small, the power consumption is low but the electric field is badly distorted. If the electric field can effectively promote water droplet coalescence, the electrode spacing can be increased to avoid adverse effect. The power consumption is affected by water content, number of electrode layer, electrode spacing and so on, and the power consumption should be decreased in consideration of the field condition and electrode structure. Source

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