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| 1 | Hydrocarbon migration in fracture-cave systems of carbonate reservoirs under tectonic stresses:A modeling study显示文摘The Tahe oilfield,located in the southwest of the Akekule nosing structure,northern Tarim basin,was the most prolific oilfield targeting at the Ordovician carbonate reservoirs in China.The reservoir space was dominant with fracture-cave systems commonly induced by tectonics and karstification.Although hydrocarbon production had proceeded for two decades in the Tahe oilfiled,the control of oil and gas accumulations was still doubtful.In this work,the periodic fluid flow induced by cyclic tectonic stresses was proposed as the mechanism of hydrocarbon migration in the fracture-cave systems of carbonate reservoirs.The fracture networks formed conduits for fluid flow,and the fluid pressure in caves transmitted from stress field provided the driving force.The constitutive equations were established among stresses,fracture densities and flow velocities.Four quasi-3D geological models were constructed to simulate the flow velocities on the Ordovician surface of Akekule nosing structure in the critical tectonic stages.The simulated results supplied indicative information on oil and gas migration and accumulation in the tectonic stages.Combining with the oil and gas charge history,a conceptual model was built to reveal the multi-stage oil and gas charge and accumulation in the Ordovician of Akekule nosing structure. | Chenjun Huang Geyun Liu Yongsheng Ma Xingui Zhou Linyan Zhang Jinyin Yin Jinrui Guo | 2019 | Petroleum Research2019，4，4： | 2 |
| 2 | Control Design and Implementation of a Spiral Spring Energy Storage System Connected to a Grid via PMSG显示文摘For an innovative spiral spring energy storage system,the permanent magnet synchronous generator(PMSG)is utilized as the energy conversion device due to its simple structure,low weight and high torque.During power generation,the output torque and moment of inertia of the spiral spring are changing continuously and simultaneously and the parameters of the PMSG show uncertainties.Furthermore,the DC link voltage of the converter should be stable and the power injected into the grid needs to be controlled.First,the change features of the external power source and the uncertainties of the generator’s internal parameters are expressed as the comprehensive disturbances,which are introduced into the dynamic model of the PMSG and also modify the dynamic model.Then,the high gain observers are utilized to estimate the comprehensive disturbances,and an improved robust backstepping control scheme integrating L2 gain and high gain observers is proposed.Secondly,the gridside inverter controller for the DC voltage loop and reactive power loop is designed based on the backstepping theory.Finally,hardware implementation is fulfilled to verify the presented algorithm.The results show that high gain observers are able to accurately estimate the external and internal interferences;the proposed control scheme can effectively suppress the external and internal interferences and guarantees output current,operating speed of the PMSG and output reactive power to correctly track respective references,and effectively stabilize the DC link voltage. | Yang Yu Zengqiang Mi Xudong Guo Xitong Niu Xiaojiang Zheng Chenjun Sun | 2018 | CSEE Journal of Power and Energy Systems2018，4，3： | 1 |
| 3 | Hydrocarbon migration in fracture-cave systems of carbonate reservoirs under tectonic stresses: A mechanism study显示文摘The fracture-cave systems of carbonate reservoirs have almost stored 30% of recoverable oil and gasaround the world. However, it is still doubtful about the mechanism of hydrocarbon migration in thefracture-cave systems. In this work, deducing from the Eshelby’ solution, we derived the equation tocalculate the bulk strain of elliptic cylinder caves applied by stresses. Calculated results indicate that thebulk strain of caves negatively increases with the radius ratio of the elliptic cave axials under fixedstresses. In the case of the effective horizontal stress increasing from 30 MPa to 80 MPa, the bulk straindifference of a cave could be up to 0.5%. It may result in 0.4% of the total cave volume of fluid transportingthrough the fracture-cave systems within such a stress cycle. Since the tectonic stresses transform in acyclic way, the volumetric ratio of new-to-old fluid in a cave would increase with the number of stresscycles. As a result, we proposed that the periodic fluid flow induced by cyclic tectonic stresses could be animportant mechanism for hydrocarbon migration in the fracture-cave systems of carbonate reservoirs. | Chenjun Huang Geyun Liu Kaibo Shi Jinyin Yin Jinrui Guo Chongzhi Tao | 2020 | Petroleum Research2020，5，2： | 1 |
| 4 | Research on the long-time operation performance of composite insulator shed hydrophobicity under hydrothermal conditions显示文摘Due to excellent anti-pollution flashover performance,a composite insulator has become the most frequently and widely used insulator product in transmission lines.Sheath hydrophobicity is the core factor that determines the anti-pollution flashover performance of the composite insulator.To study the change rule of insulator sheath hydrophobicity under the long-term operation condition,more than 390 samples produced by the same manufacturer that had operated for 3–22 years were extracted from the adjacent lines to eliminate the impact of the running environment and manufacturer formula.To study the reasons for hydrophobic fluctuations,surface energy tests and Fourier transform infrared spectroscopy tests were conducted on the superficial layer materials based on a two-droplet method.The change rule of the material physical and chemical properties with operation time was obtained.Next,the relationship between the surface microstructure of the material and operation time was determined by laser scanning confocal microscopy and scanning electron microscopy.Finally,based on the analysis results of surface energy and surface topography,the physical model of shed material hydrophobic variation in the operation process was obtained. | Li Cheng Shanfeng Shao Sida Zhang Ruijin Liao Lijun Yang Chenjun Guo | 2018 | High Voltage2018，3，1： | 1 |
| 5 | Left Ventricular Tachycardia Originating Near the Left Main Coronary Artery显示文摘 | Dayi Hu Chenjun Guo Jianjun Yang Lihua Shang Yuyun Xu Kenneth A. Ellenbogen Richard K. Shepard Mark A. Wood | 2000 | Journal of Interventional Cardiac Electrophysiology2000，，2： | 1 |
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