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| 1 | The study on exploitation potential of original low-oil-saturation reservoirs显示文摘It is preliminary estimated that the proved geological reserves of original low-oil-saturation reservoirs(OLOSRs)of 54 blocks in China are more than 820 million tons.As same as the high water-cut stage of a reservoir after water flooding,the initial water cut of OLOSRS is higher than 80%.The industrial application of EOR technology could efficiently enhance oil recovery rate from 8.4% to 20.1% of reservoirs after water flooding.The suitable measurements of EOR to the OLOSRs probably have a profound impact on achieving higher oilfield reserves and production.In this paper,the main characteristics and reserves potential of OLOSRs have been studied by investigations and laboratory experiments.The relationship between initial oil saturation and displacement efficiency is also analyzed.The feasibility of EOR technologies for different OLOSRs is discussed.The results show that the OLOSRs could be divided into two categories(primary and secondary)by origin of low oil saturation.The two categories contain abundant reserves in China’s major oilfields,but their occurrence states of crude oil are quite different.If the average oil saturation of the OLOSR is defined at 40%,there are 13.1%-54.2%crude oil that could be recovered by using the existing EOR technology,especially in the primary OLOSRs with low permeability and the secondary OLOSRs with high permeability. | Sun Yingying Zhang Shanyan Wei Xiaofang Sang Guoqiang Minghui Zhou Huang Jia Yang Jiru | 2020 | Petroleum Research2020，5，1： | 1 |
| 2 | Scaling relationships of elastic-perfectly plastic film/coating materials from small scale sharp indentation显示文摘The scaling relationships of elastic-perfectly plastic film/coating materials during sharp indentation have been obtained using dimensional analysis and finite-element modeling. Besides the bulk substrate materials, a wide range of film/coating materials with different ratios in term of the Young’s modulus and yield strength were examined, namely different values of Ef/Esand Yf/Es.Based on these scaling relationships, the substrate effects on indentation response and deformed surface profile of residual imprint are given. Furthermore, the scaling relationship among the work of indentation, reduced elastic modulus and hardness has been found. It is found that the ratio of the indentation hardness to measurement of substrate elastic modulus could be used to characterize the wear resistance of film/coating materials. In addition, a novel method to acquire the intrinsic hardness and elastic modulus of film/coating materials is proposed combined with the well-known 10% critical indentation depth rule, which avoids the error caused by estimating the contact area. This work could be contributed for characterizing the mechanical properties of film/coating materials at micro-and nanoscale. | WANG ZhaoXin WANG JiRu WANG Wen Yang NIU YiHan LI Cong ZONG XiangYu ZHANG JianHai ZHAO HongWei | 2021 | Science China(Technological Sciences)2021，64，6： | 1 |
| 3 | Study on the influence of fracture lengths and fracture angles on residual oil distribution based on the slab model显示文摘After fracturing in the pilot area,channeling occurs at a low fracture angle(15).Based on the resistance-water saturation relationship,three-dimensional physical simulation methods are used in the laboratory to study the effect of different fracture angles and lengths on the residual oil distribution during the displacement process.Meanwhile,recovery percent,displacement efficiency and expanding sweep co-efficient to the improvement of recovery percent are also discussed.The results show that the fracture angle and length are closely related to the oil saturation distribution in these models.As the fracture angle increases,the sweep coefficient decreases(0.2412→0.1463),and the recovery percent also in-creases(46.16→56.88%),but the extent of increase has been reduced(7.96→2.96%).The extension of the fracture length is more prone to have a cross-flow phenomenon;the sweep coefficient is reduced(0.2412→0.1463).Compared to the model with 1/2 oil-water well spacing,the recovery percent is decreased by 14.29%.In different fracture models,the increasable sweep coefficient has a greater impact on oil recovery than the increasable displacement efficiency(71.30→28.70%). | Guihui Lian Zhenhua Ding Liang Chen Xiaoguang Wang Jiru Yang Jigang Zhang Ming Gao Weifeng Lv Zhenpeng Leng | 2022 | Petroleum Research2022，7，4： | 0 |
| 4 | Micro-pore structure and oil displacement mechanism analysis for deep zone and low permeability reservoir in Mobei oilfield显示文摘The Mobei reservoir is a low-permeability-sandstone reservoir,due to differences in pore geometry,it can be divided into two independent reservoirs:A1 reservoir and A2 reservoir.For better understanding the water flooding development effects of Mobei reservoir,the mercury intrusion porosimetry,water flooding CT scanning and micro-CT scanning experiments are used in this study.The result shows that the reservoir has the strong heterogeneity which is weaken gradually from A1 reservoir to A2 reservoir.Reservoir pore radius is mainly distributed in the 100e200 microns,the throat radius is mainly distributed in the 1e3 micron.The water flooding core experiment in each reservoir shows a short water-free oil production period and rapid water cut after breakthrough.The A2 reservoir core flooding process is similar to piston displacement,the A1 reservoir core flooding process refers to the phenomenon(The fingering phenomenon in the process of core flooding in the A1 reservoir is obvious).The calculated water drive efficiency of the A2 reservoir is 61.2%,which is higher than 49.1%of the A1 reservoir.According to the CT scanning process,the Mobei oilfield has low micro displacement efficiency and the A1 reservoir has a smaller spread(sweep area)and higher residual oil saturation. | Haibin Su Ninghong Jia Yandong Yang Zhigang Wang Zhibin Jiang Lijuan Feng Jiru Yang Weifeng Lv | 2018 | Petroleum Research2018，3，2： | 0 |
| 5 | Boosting the high-rate performance and cycling life of NaTi_(2)(PO_(4))_(3) anode by forming N-doped carbon coating derived from polyacrylonitrile显示文摘Poor electron conductivity is the key issue influencing the rate capability of NaTi_(2)(PO_(4))_(3)(NTP).Hence,herein,polyacrylonitrile(PAN)was utilized as a NTP modifier by simply mixing NTP in a liquid PAN suspension,followed by sintering at 850℃ for 5 h.The product with a PAN/NTP mass ratio of 0.3 delivered splendid rate capabilities(achieving lithiation capacities of 282.9,243.0,207.1,173.1,133.5,and 257.5 mAh g^(−1) at 0.1,0.2,0.4,0.8,1.6,and 0.1 A^(−1),respectively)and excellent long cycling life(capacity retention of 165.5 mAh g^(−1) after 1200 cycles at 0.5 A g−1).Based on detailed structural and compositional characterizations,as well as cyclic voltammetry(CV)and electrochemical impedance spectroscopy(EIS),the uniform N-doped carbon coating stemming from PAN carbonization around the NTP particles promoted electron transfer,while the oxygen vacancies induced by N-doping in NTP facilitated Li+diffusion.The boosted and well matched electronic and ionic conductivities give rise to the optimized electrochemical performance. | Huan Yang Zhongnian Yang Yujun Bai Wenjing Du Yuheng Wang Jiru Xian | 2023 | ChemPhysMater2023，2，4： | 0 |
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