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Miscibility of light oil and flue gas under thermal action 被引量:1
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作者 XI Changfeng WANG Bojun +7 位作者 ZHAO Fang HUA Daode QI Zongyao LIU Tong ZHAO Zeqi TANG Junshi ZHOU You WANG Hongzhuang 《Petroleum Exploration and Development》 SCIE 2024年第1期164-171,共8页
The miscibility of flue gas and different types of light oils is investigated through slender-tube miscible displacement experiment at high temperature and high pressure.Under the conditions of high temperature and hi... The miscibility of flue gas and different types of light oils is investigated through slender-tube miscible displacement experiment at high temperature and high pressure.Under the conditions of high temperature and high pressure,the miscible displacement of flue gas and light oil is possible.At the same temperature,there is a linear relationship between oil displacement efficiency and pressure.At the same pressure,the oil displacement efficiency increases gently and then rapidly to more than 90% to achieve miscible displacement with the increase of temperature.The rapid increase of oil displacement efficiency is closely related to the process that the light components of oil transit in phase state due to distillation with the rise of temperature.Moreover,at the same pressure,the lighter the oil,the lower the minimum miscibility temperature between flue gas and oil,which allows easier miscibility and ultimately better performance of thermal miscible flooding by air injection.The miscibility between flue gas and light oil at high temperature and high pressure is more typically characterized by phase transition at high temperature in supercritical state,and it is different from the contact extraction miscibility of CO_(2) under conventional high pressure conditions. 展开更多
关键词 light oil flue gas flooding thermal miscible flooding miscible law distillation phase transition minimum miscible pressure minimum miscible temperature
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Molecular composition of low-temperature oxidation products of the heavy oil
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作者 Shuai Ma Yun-Yun Li +5 位作者 Ri-Gu Su Xu-Sheng Wang Jing-Jun Pan Quan Shi Guang-Zhi Liao Chun-Ming Xu 《Petroleum Science》 SCIE EI CSCD 2023年第5期3264-3271,共8页
Low-temperature oxidation(LTO)is the main reaction that affects fuel formation in the in-situ combustion process,which has important significance for the subsequent combustion propulsion and the successful extraction ... Low-temperature oxidation(LTO)is the main reaction that affects fuel formation in the in-situ combustion process,which has important significance for the subsequent combustion propulsion and the successful extraction of crude oil.In this study,heavy oil was subjected to LTO reactions at different temperatures.Three types of reaction products with varying oxidation depths were characterized in terms of the number of oxygen atoms and the polarity of the molecule to reveal the low-temperature oxidation process of the heavy oil.Ketone compounds and acid polyoxides in the oil phase and deep oxidation products with a higher number of oxygen atoms in the coke were identified with increasing oxidation depth.The experimental results showed that the oxidation reaction of the heavy oil changed from kinetic-controlled to diffusion-controlled in the open oxidation system of the heavy oil as the oxidation depth increased.The oxidation reaction of the oil phase reached a maximum and stable value in oxygen content.The molecular compositions of the ketone compound and acid polyoxide did not change significantly with further increase in reaction temperature.The molecular compositions of the deep oxidation products with a higher number of oxygen atoms in the coke phase changed significantly.The coke precursor molecules with a lower oxygen content and condensation degree participated in the coke formation,and the oxidation reaction pathway and the complexity of the oxidation product component also increased. 展开更多
关键词 low-temperature oxidation In-situ combustion Heavy oil Coke precursor Molecular composition
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Low-temperature oxidation of light crude oil in oxygen-reduced air flooding 被引量:2
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作者 QI Huan LI Yiqiang +7 位作者 CHEN Xiaolong LONG Anlin WEI Li LI Jie LUO Jianghao SUN Xuebin TANG Xiang GUAN Cuo 《Petroleum Exploration and Development》 CSCD 2021年第6期1393-1402,共10页
Light crude oil from the lower member of the Paleogene Xiaganchaigou Formation of Gaskule in Qinghai Oilfield was selected to carry out thermal kinetic analysis experiments and calculate the activation energy during t... Light crude oil from the lower member of the Paleogene Xiaganchaigou Formation of Gaskule in Qinghai Oilfield was selected to carry out thermal kinetic analysis experiments and calculate the activation energy during the oil oxidation process.The oxidation process of crude oi l in porous medium was modeled by crude oil static oxidation experiment,and the component changes of crude oil before and after low-temperature oxidation were compared through Fourier transform ion cy-clotron resonance mass spectrometry and gas chromatography;the dynamic displacement experiment of oxygen-reduced air was combined with NMR technology to analyze the oil recovery degree of oxygen-reduced air flooding.The whole process of crude oil oxidation can be divided into four stages:light hydrocarbon volatilization,low-temperature oxidation,fuel deposition,and high temperature oxidation;the high temperature oxidation stage needs the highest activation energy,followed by the fuel deposition stage,and the low-temperature oxidation stage needs the lowest activation energy;the concentration of oxygen in the reaction is negatively correlated with the activation energy required for the reaction;the higher the oxygen concentration,the lower the average activation energy required for oxidation reaction is;the low-temperature oxidation reaction between crude oil and air generates a large amount of heat and CO,CO_(2) and CH4,forming flue gas drive in the reservoir,which has certain effects of mixing phases,reducing viscosity,lowering interfacial tension and promoting expansion of crude oil,and thus helps enhance the oil recovery rate.Under suitable reservoir temperature condition,the degree of recovery of oxygen-reduced air flooding is higher than that of nitrogen flooding for all scales of pore throat,and the air/oxygen-reduced air flooding de-velopment should be preferred. 展开更多
关键词 light crude oil oxygen-reduced air flooding low-temperature oxidation thermal kinetics characteristics enhanced oil recovery
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The Influence of Paraffinic Base Oil on Low-temperature Viscosity of Naphthenic Base Oil 被引量:2
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作者 Liu Shuzhen Fu Hongrui 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2010年第1期34-37,共4页
Low-temperature viscosity of lube oils mixed with paraffinic base oil and naphthenic base oil at different mass ratios has been tested by experiments. The influence of paraffinic base oil on the performance of naphthe... Low-temperature viscosity of lube oils mixed with paraffinic base oil and naphthenic base oil at different mass ratios has been tested by experiments. The influence of paraffinic base oil on the performance of naphthenic base oil was investigated by studying the low-temperature viscosity of tested oils. The viscosity of lube oils increased with an increasing content of high-viscosity paraffinic base oil in the oil mixture. And the low-temperature viscosity was less influenced when the content of paraffinic base oil in the mixture was insignificant. In order to reduce the cost for formulating lubricating oil, a small fraction of paraffinic base oil can be added into naphthenic base oil as far as the property of lubricating oil can meet the specification. According to the study on low-temperature viscosity of the oil mixed with paraffinic base oil and naphthenic base oil, a basic rule was worked out for the preparation of qualified lubricating oils. 展开更多
关键词 paraffinic base oil naphthenic base oil low-temperature viscosity lubricating oil
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In situ catalytic upgrading of heavy crude oil through low-temperature oxidation 被引量:7
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作者 Hu Jia Peng-Gang Liu +3 位作者 Wan-Fen Pu Xian-Ping Ma Jie Zhang Lu Gan 《Petroleum Science》 SCIE CAS CSCD 2016年第3期476-488,共13页
The low-temperature catalytic oxidation of heavy crude oil(Xinjiang Oilfield,China) was studied using three types of catalysts including oil-soluble,watersoluble,and dispersed catalysts.According to primary screenin... The low-temperature catalytic oxidation of heavy crude oil(Xinjiang Oilfield,China) was studied using three types of catalysts including oil-soluble,watersoluble,and dispersed catalysts.According to primary screening,oil-soluble catalysts,copper naphthenate and manganese naphthenate,are more attractive,and were selected to further investigate their catalytic performance in in situ upgrading of heavy oil.The heavy oil compositions and molecular structures were characterized by column chromatography,elemental analysis,and Fourier transform infrared spectrometry before and after reaction.An Arrhenius kinetics model was introduced to calculate the rheological activation energy of heavy oil from the viscosity-temperature characteristics.Results show that the two oil-soluble catalysts can crack part of heavy components into light components,decrease the heteroatom content,and achieve the transition of reaction mode from oxygen addition to bond scission.The calculated rheological activation energy of heavy oil from the fitted Arrhenius model is consistent with physical properties of heavy oil(oil viscosity and contents of heavy fractions).It is found that the temperature,oil composition,and internal molecular structures are the main factors affecting its flow ability.Oil-soluble catalyst-assisted air injection or air huff-n-puff injection is a promising in situ catalytic upgrading method for improving heavy oil recovery. 展开更多
关键词 In situ catalytic oxidation Heavy oil Upgrading low-temperature oxidation Mechanism
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The occurrence characteristics of oil in shales matrix from organic geochemical screening data and pore structure properties:An experimental study Author links open overlay panel
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作者 Zi-Zhi Lin Jun-Qian Li +8 位作者 Shuang-Fang Lu Qin-Hong Hu Peng-Fei Zhang Jun-Jie Wang Qi Zhi Hong-Sheng Huang Na Yin Yue Wang Tian-Chen Ge 《Petroleum Science》 SCIE EI CAS CSCD 2024年第1期1-13,共13页
The occurrence characteristics of shale oil are of great significance to the movability of shale oil.In this study,the occurrence characteristics of oil in the shale matrix at Funing Formation shale in Subei Basin wer... The occurrence characteristics of shale oil are of great significance to the movability of shale oil.In this study,the occurrence characteristics of oil in the shale matrix at Funing Formation shale in Subei Basin were quantitatively evaluated by organic geochemistry and microscopic pore structure characterization experiments.The Multiple Isothermal Stages Pyrolysis(MIS)experiment results show that the content of total oil,adsorbed oil,and free oil in the shales are 3.15-11.25 mg/g,1.41-4.95 mg/g,and 1.74-6.51 mg/g,respectively.among which the silicon-rich shale has the best oil-bearing.The relative content of free oil shows an increasing trend in pores with pore diameters greater than 3 nm.When the relative content of free oil reaches 100%,the pore size of silicon-rich shale is about 200 nm,while that of calcium-rich shale,clay-rich shale,and siliceous mixed shale is about 10 nm.The occurrence law of adsorbed oil is opposite to that of free oil,which indicates that shale oil will occur in the pores and fractures in a free state in a more extensive pore size range(>200 nm).This study also enables us to further understand the occurrence characteristics of shale oil under the interaction of occurrence state and occurrence space. 展开更多
关键词 Shale oil Occurrence characteristics Sequential solvent extraction low-temperature nitrogen adsorption Funing Formation Dongtai Depression
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Origin of condensate oil and natural gas in Bozhong 19-6 gas field,Bohai Bay Basin
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作者 Jianyong Xu Wei Li 《Energy Geoscience》 EI 2024年第1期54-62,共9页
The discovery of the Bozhong 19-6 gas field has opened a new frontier for deep gas exploration in the Bohai Bay Basin,with a great potential for further gas exploration.However,poor understanding of oil and gas origin... The discovery of the Bozhong 19-6 gas field has opened a new frontier for deep gas exploration in the Bohai Bay Basin,with a great potential for further gas exploration.However,poor understanding of oil and gas origin has been limiting the exploration progress in this area.To clarify the origin of condensate oil and gas in Bozhong 19-6 gas field,this study adequately utilized the organic geochemical analysis data to investigate the composition and geochemical characteristics of condensate oil and natural gas,and analyzed the relationship between condensate oil and the three sets of source rocks in the nearby subsags.Results show that the lighter components dominate the condensate oil,with a forward type predominance.The parent material of crude oil was primarily deposited in a shallow,clay-rich,low-salinity,weakly reducing aquatic environment.The condensate and natural gas have similar parent source characteristics and maturity,with Ro ranging from 1.4%to 1.6%.Both are products of high maturity stage,indicating that they are hydrocarbon compounds produced by the same group of source rocks in the same stage.Oil-sources correlation shows that condensate oil and gas mainly originate from the source rocks of the third member of Shahejie Formation in the nearby subsags of the Bozhong 19-6 structural belt. 展开更多
关键词 Bozhong Sag Natural gas Condensate oil light hydrocarbon Gas-source correlation oil-source correlation
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Catalytic performance and kinetics of Au/γ-Al_2O_3 catalysts for low-temperature combustion of light alcohols
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作者 邓谦 李小梅 +3 位作者 彭振山 龙云飞 相龙明 蔡铁军 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第3期437-442,共6页
Au/γ-Al2O3 catalysts were prepared by deposition-precipitation method for the catalytic combustion of low concentration alcohol streams(methanol,ethanol,iso-propanol and n-propanol).The catalysts were characterized b... Au/γ-Al2O3 catalysts were prepared by deposition-precipitation method for the catalytic combustion of low concentration alcohol streams(methanol,ethanol,iso-propanol and n-propanol).The catalysts were characterized by X-ray photoelectron spectroscopy(XPS),X-ray diffractometry(XRD) and energy dispersive X-ray micro analysis(EDS) techniques.The XPS results showed that there was only Au0 on the surface of catalysts.The XRD patterns showed that Au was presumably highly dispersed over γ-Al2O3.The temperatures for complete conversion of methanol,ethanol,iso-propanol and n-propanol with concentration of 2.0 g/m3 were 60,155,170 and 137 ℃,respectively,but they were completely mineralized into CO2 and H2O at 60,220,260 and 217 ℃ respectively over the optimized catalyst.The activity of the catalyst was stable in 130 h.The kinetics for the catalytic methanol elimination followed quasi-first order reaction expressed as r=0.652 8c0+0.084 2.The value of apparent activation energy is 54.7 kJ/mol in the range of reaction temperature. 展开更多
关键词 GOLD supported catalyst light alcohols low-temperature catalytic combustion KINETICS
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基于DGA与TPE-LightGBM的变压器故障诊断
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作者 杨金鑫 廖才波 +3 位作者 胡雄 朱文清 张旭 刘邦 《电力科学与技术学报》 CAS CSCD 北大核心 2024年第4期70-77,共8页
油中溶解气体分析(dissolved gas analysis,DGA)对变压器故障的早期预警及诊断具有重要意义。为了提升变压器故障诊断的准确性及可靠性,提出一种基于树结构概率密度估计(tree-structured parzen estimator,TPE)算法优化轻量级梯度提升机... 油中溶解气体分析(dissolved gas analysis,DGA)对变压器故障的早期预警及诊断具有重要意义。为了提升变压器故障诊断的准确性及可靠性,提出一种基于树结构概率密度估计(tree-structured parzen estimator,TPE)算法优化轻量级梯度提升机(light gradient boosting machine,LightGBM)的变压器故障诊断方法。首先,建立包含油中气体比值、编码等16维DGA特征集合,采用最小绝对收缩和选择(least absolute shrinkage and selection opera-tor,LASSO)算法选择用于变压器故障诊断的有效特征量;其次,构建基于LightGBM的变压器故障诊断方法,并引入TPE算法对LightGBM诊断模型参数进行优化,形成最优故障诊断模型;最后,选用精确度、召回率和F1分数等评价指标对所提诊断模型性能进行评估。研究结果表明,TPE-LightGBM的平均准确率为90.23%,其诊断精度及鲁棒性均优于RF和XGBoost等算法。同时,与现场常用的三比值法进行对比,所提方法的准确性和可靠性均有显著提升。该方法可有效提升电力变压器的智能运维水平。 展开更多
关键词 变压器 油中溶解气体 故障诊断 树结构概率密度估计 LASSO算法 轻量级梯度提升机
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Vitrectomy combined with silicone oil tamponade in the treatment of severely traumatized eyes with the visual acuity of no light perception 被引量:8
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作者 Shan-Shan Yang Tao Jiang 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2013年第2期198-203,共6页
AIM: To evaluate the efficacy of surgical treatment of vitrectomy combined with silicone oil tamponade in the treatment of severely traumatized eyes with the visual acuity of no light perception (NLP).METHODS: This wa... AIM: To evaluate the efficacy of surgical treatment of vitrectomy combined with silicone oil tamponade in the treatment of severely traumatized eyes with the visual acuity of no light perception (NLP).METHODS: This was a retrospective uncontrolled interventional case-series of 19 patients of severely traumatized eyes with NLP who underwent vitrectomy surgery at the Affiliated Hospital of Medical College, Qingdao University (Qingdao, China) during a 3-year period. We recorded perioperative factors with the potential to influence functional outcome including duration from the injury to intervention; causes for ocular trauma; open globe or closed globe injury; grade of vitreous hemorrhage; grade of endophthalmitis; grade of retinal detachment; size and location of intraocular foreign body (IOFB); extent and position of retinal defect; grade of proliferative vitreoretinopathy (PVR); type of surgery; perioperative complications and tamponade agent. The follow-up time was from 3 to 18 months, and the mean time was 12 months.RESULTS: After a mean follow-up period of 12 months (3-18 months) 10.53% (2/19) of eyes had visual acuity of between 20/60 and 20/400, 52.63% (10/19) had visual acuity less than 20/400 but more than NLP, and 36.84% (7/19) remained NLP. Visual acuity was improved from NLP to light perception (LP) or better in 63.16% (12/19) of eyes and the rate of complete retinal reattachment was 73.68% (14/19). Good visual acuity all resulted from those patients of blunt trauma with intact eyewall (closed globe injury). The perioperative factors of poor visual acuity prognosis included delayed intervention; open globe injury; endophthalmitis; severe retinal detachment; large IOFB; macular defect; a wide range of retinal defects andsevere PVR.CONCLUSION: The main reasons of NLP after ocular trauma are severe vitreous hemorrhage opacity; refractive media opacity; retinal detachment; retinal and uveal damages and defects, especially defects of the macula; PVR and endophthalmitis. NLP after ocular trauma in some cases does not mean permanent vision loss. Early intervention of vitrectomy combined with silicone oil tamponade and achieving retinal reattachment of the remaining retina, may make the severely traumatized eyes regain the VA of LP or better. 展开更多
关键词 VITRECTOMY silicone oil tamponade severely traumatized eyes no light perception
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The effect of slight to minor biodegradation on C_6 to C_7 light hydrocarbons in crude oils: a case study from Dawanqi Oilfield in the Tarim Basin,NW China 被引量:7
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作者 Lu Yang Chunming Zhang +3 位作者 Meijun Li Jing Zhao Xuening Qi Jinxiu Du 《Acta Geochimica》 EI CAS CSCD 2016年第2期203-214,共12页
Light hydrocarbons (LHs) are one of the main petroleum fractions in crude oils, and carry much infor- mation regarding the genetic origin and alteration of crude oils. But secondary alterations--especially biodegrad... Light hydrocarbons (LHs) are one of the main petroleum fractions in crude oils, and carry much infor- mation regarding the genetic origin and alteration of crude oils. But secondary alterations--especially biodegrada- tion--have a significant effect on the composition of LHs in crude oils. Because most of the LHs affected in oils underwent only slight biodegradation (rank 1 on the biodegradation scale), the variation of LHs can be used to describe more the refined features of biodegradation. Here, 23 crude oils from the Dawanqi Oilfield in the Tarim Basin, NW China, eleven of which have been biodegraded to different extents, were analyzed in order to investigate the effect of slight to minor biodegradation on C6--C7 LHs. The study results showed that biodegradation resulted in the prior depletion of straight-chained alkanes, followed by branched alkanes. In slight and minor biodegraded oils, such biodegradation scale could not sufficiently affect C6- C7 cycloalkanes. For branched C6--C7 alkanes, generally, monomethylalkanes are biodegraded earlier than dimethylalkanes and trimethylalkanes, which indicates that branched alkanes are more resistant to biodegradation, with the increase of substituted methyl groups on parent rings. The degree of alkylation is one of the primary controlling factors on the biodegradation of C6-Cv LHs. There is a particular case: although 2,2,3-trimethylbutane has a rela- tive higher alkylation degree, 2,2-dimethylpentane is more resistant to biodegradation than 2,2,3-trimethylbutane. 2,2- Dimethylpentane is the most resistant to biodegradation in branched C6-C7 alkanes. Furthermore, the 2-methylpen- tane/3-methylpentane and 2-methylhexane/3-methylhexane ratios decreased steadily with increasing biodegradation, which implies that isomers of bilateral methyl groups are more prone to bacterial attack relative to mid-chain iso- mers. The position of the alkyls on the carbon skeleton is also one of the critical factors controlling the rate of biodegradation. With increasing biodegradation, Mango's LH parameters K1 values decrease and K2 values increase, the values of n-heptane and isoheptane decrease, and the indices of methylcyclohexane and cyclohexane increase. LH parameters should be applied cautiously for the biodegraded oils. Because biodegraded samples belong to slight or minor biodegraded oils, the values of n-heptane and isoheptane from Dawanqi Oilfield can better reflect and determine the "Biodegraded" zone. When the heptane value is 0-21 and the isoheptane value is 0-2.6, the crude oil in Dawanqi Oilfield is defined as the "Biodegraded" zone 展开更多
关键词 Crude oils - light hydrocarbons BIODEGRADATION Dawanqi oilfield Tarim Basin
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Alkyl Naphthalenes and Phenanthrenes:Molecular Markers for Tracing Filling Pathways of Light Oil and Condensate Reservoirs 被引量:2
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作者 LI Meijun WANG Tieguan +4 位作者 LIU Ju ZHANG Meizhu LU Hong MA Qinglin GAO Lihui 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2010年第5期1294-1305,共12页
Condensates and light oils are generally characterized by high maturity, low concentration of sterane and terpane biomarkers and low content of non-hydrocarbon fraction. As a result, some commonly-used sterane, terpan... Condensates and light oils are generally characterized by high maturity, low concentration of sterane and terpane biomarkers and low content of non-hydrocarbon fraction. As a result, some commonly-used sterane, terpane and carbazole migration parameters in conventional oil reservoirs may have a certain limitation in condensate and light oil reservoirs for their poor signal-noise ratios in the gas chromatography-mass spectrometry (GC-MS). Naphthalene, phenanthrene and their methylated substituents, however, are present in significant concentrations in condensates and light oils. Taking the Fushan depression (in the Beibuwan Basin, Northern South China Sea) as an example, this paper attempts for the first time to use polycyclic aromatic hydrocarbon (PAH)-related parameters to trace migration directions and filling pathways for condensate and light oil reservoirs. The result shows that TMNr (i.e. 1, 3, 7-TMN/(1, 3, 7-TMN + 1, 2, 5-TMN), TMN: trimethylnaphthalene)), MPI-1 (i.e. 1.5×(2-MP + 3-MP)/(P + 1-MP + 9-MP), P: phenanthrene MP: methyiphenanthrene), MN/DMN (∑methylnaphthalene/∑dimethylnaphthalene, %) and MN/TMN (∑nethylnaphthalene/∑trimethylna- phthalene, %) can be used to trace the filling pathways of condensate and light oil reservoirs. These parameters, together with geological consideration and other bulk oil properties (e.g. the gas to oil ratio and density), suggest that the condensates and light oils in the Huachang oil and gas field are mainly sourced from the Bailian sag that is located to the northeast of the Huachang uplift in the Fushan depression. 展开更多
关键词 CONDENSATE light oil polycyclic aromatic hydrocarbon (PAH) NAPHTHALENE phenanthrene migration filling pathway Fushan depression
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Oxidization characteristics and thermal miscible flooding of high pressure air injection in light oil reservoirs 被引量:3
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作者 XI Changfeng WANG Bojun +11 位作者 ZHAO Fang LIU Tong QI Zongyao ZHANG Xialin TANG Junshi JIANG Youwei GUAN Wenlong WANG Hongzhuang HE Dongbo SONG Xinmin HUA Daode ZHANG Xiaokun 《Petroleum Exploration and Development》 CSCD 2022年第4期874-885,共12页
Physical modeling,numerical simulation and field case analysis were carried out to find out the subsurface thermal oxidation state,thermal oxidation front characteristics and production dynamic characteristics of high... Physical modeling,numerical simulation and field case analysis were carried out to find out the subsurface thermal oxidation state,thermal oxidation front characteristics and production dynamic characteristics of high pressure air injection thermal oxidation miscible flooding technology.The lighter the composition and the lower the viscosity of the crude oil,the lower the fuel consumption and the combustion temperature are.The thermal oxidation front of light oil and volatile oil can advance stably,and a medium-temperature thermal oxidation stable displacement state can be formed in the light oil reservoir under high pressure conditions.With strong thermal gasification and distillation,light oil and volatile oil are likely to form a single phase zone of gasification and distillation with thermal flue gas at the high-temperature and high-pressure heat front,finally,an air-injection thermal miscible front.In light oil reservoirs,the development process of high-pressure air-injection thermal miscible flooding can be divided into three stages:boosting pressure stage,low gas-oil ratio and high-efficiency stable production stage and high gas-oil ratio production stage.Approximately 70%of crude oil is produced during the boosting pressure stage and low gas-oil ratio high-efficiency and stable production stage. 展开更多
关键词 light oil reservoir air flooding displacement characteristics high-pressure oxidation front thermal miscible flooding fire flooding
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Photocatalytic degradation of organic pollutants using green oil palm frond-derived carbon quantum dots/titanium dioxide as multifunctional photocatalysts under visible light radiation 被引量:2
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作者 Zeng Wei Heng Woon Chan Chong +2 位作者 Yean Ling Pang Lan Ching Sim Chai Hoon Koo 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2022年第11期21-34,共14页
The present work suggested the use of waste oil palm frond as an alternative precursor for nitrogendoped carbon quantum dots(NCQDs)and proposed a straightforward in-situ hydrothermal method for the preparation of NCQD... The present work suggested the use of waste oil palm frond as an alternative precursor for nitrogendoped carbon quantum dots(NCQDs)and proposed a straightforward in-situ hydrothermal method for the preparation of NCQDs/TiO_(2)nanocomposites.The elemental composition,morphological,structural and optical characteristics of NCQDs/TiO_(2)nanocomposites have been comprehensively investigated.The successful grafting of NCQDs on TiO_(2)matrix was confirmed by the formation of Ti AOAC bond and the electronic coupling between theπ-states of NCQDs and the conduction band of TiO_(2).For the first time,the oil palm frond-derived NCQDs/TiO_(2)was adopted in the photodegradation of methylene blue(MB)under visible-light irradiation.As a result,the photocatalytic efficiency of NCQDs/TiO_(2)nanocomposites(86.16%)was 2.85 times higher than its counterpart TiO_(2)(30.18%).The enhanced performance of nanocomposites was attributed to the pivotal roles of NCQDs serving as electron mediator and visiblelight harvester.Besides,the optimal NCQDs loading was determined at 4 ml while the removal efficiency of NCQDs/TiO_(2)-4 was the highest at a catalyst dosage of 1 g.L^(-1)under alkaline condition.This research work is important as it proposed a new insight to the preparation of biomass-based NCQDs/TiO_(2)using a facile synthetic method,which offers a green and sustainable water remediation technology. 展开更多
关键词 oil palm frond biomass N-doped carbon quantum dots Titanium-dioxide In-situ hydrothermal Visible light photocatalysis Methylene blue
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Experimental investigation on CO_2-light crude oil interfacial and swelling behavior 被引量:4
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作者 Mostafa Lashkarbolooki Shahab Ayatollahi 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2018年第2期373-379,共7页
A systematic series of experiments are designed and performed including inteffacial tension (IFT) measurements concomitant with Bond (BN, the ratio of gravity forces to capillary forces) and swelling/extraction me... A systematic series of experiments are designed and performed including inteffacial tension (IFT) measurements concomitant with Bond (BN, the ratio of gravity forces to capillary forces) and swelling/extraction measurements. Dynamic IFT, BN and swelling/extraction are measured as a function of pressure at temperatures of 30, 50 and 80 ℃. In addition, in the light of measured IFT the minimum miscibility pressure (MMP) of CO2 and light crude oil is determined based on a method called vanishing inteffacial tension (VIT). The obtained results interestingly revealed that equilibrium IFT decreases linearly with pressure in two distinct pressure intervals while equilibrium BN shows an increasing trend as a function of pressure for all of the studied cases while no obvious trend is observed for swell- ing of crude oil and extraction of light-components regarding time, temperature and pressure. 展开更多
关键词 CO2 light crude oil IFT Bond number Swelling
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Compositional and geochemical characteristics of light hydrocarbons for typical marine oils and typical coal-generated oils in China 被引量:1
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作者 WANG Xiang ZHANG Min 《Chinese Journal Of Geochemistry》 EI CAS 2008年第4期407-411,共5页
Different types of crude oils have different light hydrocarbon compositional and geochemical character-istics. Based on the light hydrocarbon data from two kinds of oils,i.e.,coal-generated oils and marine oils in Chi... Different types of crude oils have different light hydrocarbon compositional and geochemical character-istics. Based on the light hydrocarbon data from two kinds of oils,i.e.,coal-generated oils and marine oils in China,light hydrocarbons in marine oils in the Tazhong area are generally relatively enriched in n-heptane,and coal-generated oils from the Turpan Basin are enriched in methylcyclohexane . The K1 values,reported by Mango (1987),range from 0.97 to 1.19 in marine oils,basically consistent with what was reported by Mango on light hy-drocarbons in terms of the majority of the crude oil data. But the K1 values of coal-generated oils are particularly high (1.35-1.66) and far greater than those of marine oils; heptane values in marine oils,ranging from 32.3% to 45.4%,and isoheptane values,ranging from 1.9 to 3.7,are respectively higher than those of coal-generated oils,in-dicating that the oils are in the high-maturity stage. In addition,expulsion temperatures of coal-generated oils from the Turpan Basin are obviously lower than those of marine oils from the Tazhong area. 展开更多
关键词 中国 海上石油 煤油 碳水化合物 参数
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Compositional characteristics and geochemical significance of light hydrocarbons for crude oils in Tarim Basin, China 被引量:2
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作者 张敏 《Chinese Journal Of Geochemistry》 EI CAS 2005年第3期228-231,共4页
Light hydrocarbons, especially C-7 isoalkanes, cyclopentanes, cyclohexanes and n-heptane in 540 oils from the Tarim Basin were studied systematically. The results suggested the K-1 values [(2-MH+2,3-DMP)/(3-MH+2,4-DMP... Light hydrocarbons, especially C-7 isoalkanes, cyclopentanes, cyclohexanes and n-heptane in 540 oils from the Tarim Basin were studied systematically. The results suggested the K-1 values [(2-MH+2,3-DMP)/(3-MH+2,4-DMP)] of crude oils vary from a lowest value of {0.78}, to a highest value of {1.54}, but the K-1 values of the majority of oil samples (80%) range from {0.90} to {1.20}. However, the absolute contents of (2-methylhexane+ 2,3-dimethylpentane) and (3-methylhexane+2,4-dimethylpentane) in the total light hydrocarbons (C-4-C-7) show a similar variation trend. The variation of K-1 values of crude oils can suggest a typical sedimentary environment for source rocks. Therefore, according to the compositional characteristics of C-7 light hydrocarbons in light of the steady-state catalytic hypothesis, non-marine oils from the Yingmaili area and marine oils from the Tazhong uplift in the Tarim Basin were genetically classified. 展开更多
关键词 中国 塔里木盆地 碳氢化合物 天然气 石油 地质构造
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Oil geochemistry derived from the Qinjiatun–Qikeshu oilfields:insight from light hydrocarbons
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作者 Jin Li Ting Kong Min Zhang 《Acta Geochimica》 EI CAS CSCD 2018年第3期433-440,共8页
A suite of 27 oils from the Qinjiatun–Qikeshu oilfields in the Lishu Fault Depression of the Songliao Basin was analyzed using whole oil gas chromatography.In combination with the relative distribution of C27, C28,an... A suite of 27 oils from the Qinjiatun–Qikeshu oilfields in the Lishu Fault Depression of the Songliao Basin was analyzed using whole oil gas chromatography.In combination with the relative distribution of C27, C28,and C29 regular steranes, detailed geochemical analyses of light hydrocarbons in oil samples revealed crude oils characterized by the dual input of lower aquatic organisms and higher terrestrial plants. Several light hydrocarbon indicators suggest that the liquid hydrocarbons have maturities equivalent to vitrinite reflectances of around0.78%–0.93%. This is consistent with the maturity determination of steranes C2920 S/(20 S ? 20 R) and C29 aab/(aaa ? abb). Crude oils derived from the two distinct oilfields likely both have source rocks deposited in a lacustrine environment based on light hydrocarbon parameters and on higher molecular weight hydrocarbon parameters. The results show that light hydrocarbon data in crude oils can provide important information for understanding the geochemical characteristics of the Qinjiatun–Qikeshu oils during geologic evolution. 展开更多
关键词 light hydrocarbons CRUDE oil Lishu FaultDepression GEOCHEMISTRY characteristic
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Catalytic Cracking Characteristics of Plant Oil for Producing Light Olefins and Light Aromatics
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作者 Cheng Xiaojie 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2019年第1期55-61,共7页
Catalyst containing shape selective zeolite is used to investigate the catalytic cracking characteristics of palm oil and three types of hydrocarbon VGOs on a fixed fluidized bed(FFB) unit. The advantage of producing ... Catalyst containing shape selective zeolite is used to investigate the catalytic cracking characteristics of palm oil and three types of hydrocarbon VGOs on a fixed fluidized bed(FFB) unit. The advantage of producing light olefins and light aromatics by catalytic cracking of plant oil is discussed. Results indicate that the hydrocarbyl group of the plant oil molecule is quite readily crackable; the C_6—C_8 aromatics yield is well above and the light olefins yield is about the same with the hydrocarbon feeds, while the yields of low value products are lower; the hydrocarbyl group of the plant oil molecule has strong tendency of aromatization, and can enter the zeolite pores to selectively form C_6—C_8 aromatics; during catalytic cracking of plant oil and fatty acids, a portion of the oxygen is removed in the form of water through hydrogen transfer reaction, while olefins are prevented from being saturated, which can ensure proper yields of both low-carbon olefins and light aromatics. 展开更多
关键词 plant oil catalytic CRACKING HYDROGEN-TRANSFER light OLEFINS light AROMATICS
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Improving Light Oil Yield, an Important Way to the Sustainable Development of Petroleum
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作者 Sun Lili 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2004年第4期15-18,共4页
Oil resources are non- renewable and the utilization of oil resources should be sustainable andrational. Oil processing industry must, to the maximum extent, produce liquid transportation fuel and chemi-cal feedstocks... Oil resources are non- renewable and the utilization of oil resources should be sustainable andrational. Oil processing industry must, to the maximum extent, produce liquid transportation fuel and chemi-cal feedstocks, which can hardly be replaced by other forms of energy. Restructuring oil refineries in China,developing hydrocracking technologies and improving light oil yield are the significant means to achievethe sustainable development of petroleum processing industry. 展开更多
关键词 PETROLEUM SUSTAINABLE development light oil YIELD HYDROCRACKING
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