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Enhanced oil recovery by low-salinity water spontaneous imbibition (LSW-SI) in a typical tight sandstone formation of mahu sag from core scale to field scale

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Petroleum 2021年第3期7卷 272-281页

作者： Bing Wei Lele Wang Tao Song Mengying Zhong mikhail a.varfolomeev State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China Department of Petroleum Engineering Kazan Federal UniversityKremlevskaya Str.18Kazan420008Russia

Accelerating mass exchange between matrix and fractures is the essence of enhanced oil recovery(EOR)in tight formations after natural *** salinity water(LSW)injection has been commerciallyproven in conventional reservoirs EOR,with scale projects in progress *** is,however,a lack of understanding of the EOR effect in tight ***,in this work,we introduced LSWEOR to a target tight formation using huff-puff *** imbibition(SI)tests were firstly performed on homogenous Berea sandstone cores with decreasing salinity brine to observe the production *** results indicated that the oil recovery of the tight rock was boosted by tuning brine *** all the used brines with salinity ranging from 0.021%to 2.1%TDS(total dissolved salinity),the 0.21%TDS brine showed a rapid increase in oil production over imbibing time,which finally led to an incremental oil recovery of 4.5%OOIP(original oil in place).Core-scale modeling was conducted by history-matching the oil recovery dynamics of the SI results through modifying capillary pressure and relative permeability.A full-scale reservoir model was constructed using micro-seismic data to model fracture geometry combing fracturing results and scaling parameters obtained from core scale *** is proven that LSW huff-n-puff stimulated the oil production after natural depletion and improved MEE(mass exchange efficiency)of the target formation,but the EOR benefit was not comparable to CO2 and surfactant-assisted water huff-puff methods.

关键词： Fractured tight formation Enhanced oil recovery Low-salinity effect Spontaneous imbibition Huff-n-puff

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Forecasting oil production in unconventional reservoirs using long short term memory network coupled support vector regression method: A case study

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Petroleum 2023年第4期9卷 647-657页

作者： Shuqin Wen Bing Wei Junyu You Yujiao He Jun Xin mikhail a.varfolomeev National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China School of Petroleum and Natural Gas Engineering Chongqing University of Science and TechnologyChongqing401331China Research Institute of Geological Exploration and Development CNPC Chuanqing Drilling Engineering Limited CompanyChengdu610051China Department of Petroleum Engineering Kazan Federal UniversityKremlevskaya Str.18Kazan420008Russia

Production prediction is crucial for the recovery of hydrocarbon ***,accurate and rapid production forecasting remains challenging for unconventional reservoirs due to the complexity of the percolation process and the scarcity of available *** address this problem,a novel model combining a long short-term memory network(LSTM)and support vector regression(SVR)was proposed to forecast tight oil *** variables,the tubing head pressure,nozzle size,and water rate were utilized as the inputs of the presented machine-learning workflow to account for the influence of operational *** time-series response of tight oil production was the output and was predicted by the optimized LSTM *** SVR-based residual correction model was constructed and embedded with LSTM to increase the prediction *** studies were carried out to verify the feasibility of the proposed method using data from two wells in the Ma-18 block of the Xinjiang *** curve analysis(DCA)methods,LSTM and artificial neural network(ANN)models were also applied in this study and compared with the LSTM-SVR model to prove its *** was demonstrated that introducing residual correction with the newly proposed LSTM-SVR model can effectively improve prediction *** LSTM-SVR model of Well A produced the lowest prediction root mean square error(RMSE)of 5.42,while the RMSE of Arps,PLE Duong,ANN,and LSTM were 5.84,6.65,5.85,8.16,and 7.70,*** RMSE of Well B of LSTM-SVR model is 0.94,while the RMSE of ANN,and LSTM were 1.48,and 2.32.

关键词： Tight oil Production forecast LSTM-SVR Residual correction

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Heat front propagation in shale oil reservoirs during air injection:Experimental and numerical studies

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Petroleum Science 2024年第5期21卷 3379-3389页

作者： Shuai Zhao Chun-Yun Xu Wan-Fen Pu Qing-Yuan Chen Cheng-Dong Yuan mikhail a.varfolomeev Vladislav Sudakov State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500SichuanChina Tianfu Yongxing Laboratory Chengdu610213SichuanChina Department of Petroleum Engineering Kazan Federal UniversityKazan420008Russia Institute of Geology and Petroleum Technologies Kazan Federal UniversityKazan420008Russia Center for Petroleum Science and Engineering Skolkovo Institute of Science and TechnologyMoscow121205Russia

Air injection technique for developing shale oil has gained significant attention. However, the ability of the heat front to consistently propagate within the shale during air injection remains uncertain. To address this, we investigated the heat front propagation within oil-detritus mixtures, shale cores, and fractured shale cores using a self-designed combustion tube(CT) and experimental schemes. By integrating the results obtained from high-pressure differential scanning calorimetry and CT, we developed a comprehensive reaction kinetics model to accurately analyze the main factors influencing the heat front propagation within fractured shale. The findings revealed that in the absence of additional fractures, the heat front failed to propagate within the tight shale. The flow of gases and liquids towards the shale core was impeded, resulting in the formation of a high-pressure zone at the front region of the shale. This pressure buildup significantly hindered air injection, leading to inadequate oxygen supply and the extinguishment of the heat front. However, the study demonstrated the stable propagation of the heat front within the oil-detritus mixtures, indicating the good combustion activity of the shale ***, the heat front successfully propagated within the fractured shale, generating a substantial amount of heat that facilitated the creation of fractures and enhanced gas injection and shale oil flow. It was important to note that after the heat front passed through the shale, the combustion intensity decreased. The simulation results indicated that injecting air into the main fracturing layers of the shale oil reservoir enabled the establishment of a stable heat front. Increasing the reservoir temperature(from 63 to 143℃) and oxygen concentration in the injected gas(from 11% to 21%) promoted notable heat front propagation and increased the average temperature of the heat front. It was concluded that temperature and oxygen concentration had the mos

关键词： Heat front propagation Shale oil Kinetics model Combustion tube Air injection

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NMR chemical shifts of carbon atoms and characteristic shift ranges in the oil sample

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Petroleum Research 2022年第2期7卷 269-274页

作者： Ilfat Z.Rakhmatullin Sergej V.Efimov Alexander V.Klochkov Oleg I.Gnezdilov mikhail a.varfolomeev Vladimir V.Klochkov Kazan Federal University 18 Kremlevskaya St.Kazan420008Russian Federation

Application of high resolution^(13)C nuclear magnetic resonance(NMR)spectroscopy to characterize crude oil was *** chemical shifts of^(13)C NMR functional groups that determine the composition of the oil sample were *** fractions of primary,secondary,quaternary,tertiary,aromatic groups,aromatic factor and average hydrocarbon chain length of aliphatic hydrocarbons of the oil sample according to^(13)C NMR spectra were *** description of the^(13)C NMR spectra of the oil sample using a single consideration of three NMR spectra:^(13)C,^(13)C Attached Proton Test(APT),^(13)C with Gated Decoupling(GD)was *** different contribution of the studied oil sample in the aliphatic(10e75 ppm)and aromatic(115e165 ppm)areas of the^(13)C NMR spectra was *** presence of all major hydrocarbon components in the studied oil sample was established on the quantitative level,the aromaticity factor and the mean length of the hydrocarbon chain were *** fractions of aromatic molecules and functional groups constituting oil hydrocarbons were *** this work we demonstrate that the attached proton test and gated decoupling^(13)C NMR spectroscopy can afford all information to complete the chemical shift assignment of an oil sample,especially for determination of long range 1He^(13)C coupling constants and^(13)C multiplicity.

关键词： ^(13)C NMR spectroscopy Crude oil Oil fraction Functional group Qualitative analysis Quantitative composition Aromaticity Attached proton test Gated decoupling

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Study of native oil-bearing rocks of the Cuban basin by high resolution NMR spectroscopy

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Petroleum Research 2022年第4期7卷 495-499页

作者： Ilfat Z.Rakhmatullin Sergej V.Efimov Ekaterina I.Kondratyeva Lisset Miquel Gonzalez Kajum R.Safiullin mikhail a.varfolomeev Alexander V.Klochkov Vladimir V.Klochkov Kazan Federal University 18 Kremlevskaya St.Kazan420008Russian Federation

Application of high resolution^(13)C nuclear magnetic resonance(NMR)spectroscopy to characterize Cuba oil and oil-containing rock samples from Cuban basin was *** chemical shifts of^(13)C NMR functional groups for later determination the composition of the oil and rock samples were *** different contribution of the studied samples in the aliphatic and aromatic areas was *** fractions of primary,secondary,quaternary,tertiary,aromatic groups,aromaticity factor and the mean length of hydrocarbon chain length of aliphatic hydrocarbons were *** analysis on the quantitative level for all major hydrocarbon components,the aromaticity factor and the mean length of the hydrocarbon chain were carried out.

关键词： ^(13)C NMR spectroscopy Cuba oil Rock sample Functional group Qualitative analysis Quantitative composition Aromaticity

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基于γ-Al_(2)O_(3)载体的高孔隙率Ni-Mo催化剂制备及催化特超稠油降黏效果评价

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油田化学 2023年第3期40卷 503-508页

作者：袁成东刘磊 IL’YASOV Il’dar R 丁保东曹畅周晓冬 varfolomeev mikhail A 西南石油大学石油与天然气工程学院四川成都610500 俄罗斯喀山联邦大学石油工程系喀山420008俄罗斯中国石油化工集团公司碳酸盐岩缝洞型油藏提高采收率重点实验室新疆乌鲁木齐830011 中国石油化工股份有限公司西北油田分公司新疆乌鲁木齐830011 俄罗斯喀山联邦大学物理化学系俄罗斯喀山420008

塔河油田特超稠油在井筒掺稀降黏开采过程中掺稀比高、频繁上返异常,难以实现经济有效开采。针对塔河特超稠油高沥青质含量的特点,以1,3-丙二醇、仲钼酸铵和硝酸镍为原料,研发了一种基于γ-Al_(2)O_(3)载体的高孔隙度Ni-Mo催化剂,评价... 详细信息

塔河油田特超稠油在井筒掺稀降黏开采过程中掺稀比高、频繁上返异常,难以实现经济有效开采。针对塔河特超稠油高沥青质含量的特点,以1,3-丙二醇、仲钼酸铵和硝酸镍为原料,研发了一种基于γ-Al_(2)O_(3)载体的高孔隙度Ni-Mo催化剂,评价了其地面改质降黏效果。结果表明,三叶形γ-Al_(2)O_(3)催化剂载体具有圆柱形孔隙结构,孔隙直径以5~11 nm为主。Ni-Mo催化剂可以将特超稠油的黏度(50℃)从28 200 mPa·s降至298 mPa·s,降黏率为98.94%,密度从1.0070 g/mL降至0.8724 g/mL;同时,饱和烃的含量显著增加,胶质和沥青质的含量大幅降低。地面催化改质降黏与改质稀油回掺相结合的开采技术能有效降低特超稠油黏度,地面催化改质效果良好,可有效节约掺稀油用量,提升开采效果。

关键词：特超稠油氧化铝 Ni-Mo催化剂催化改质降黏

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低场核磁共振用于原位原油组成分析及降黏剂评价

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油田化学 2024年第4期41卷 714-717,737页

作者：涂东周晓冬袁成东丁磊 AL-MUNTASER Ameen A 赵忠文吴文明 varfolomeev mikhail A 中国石油化工股份有限公司西北油田分公司新疆乌鲁木齐830011 俄罗斯喀山联邦大学俄罗斯喀山420008 斯科尔科沃科学技术研究院俄罗斯莫斯科121205

采用低场核磁共振(LF-NMR)技术分析了塔河超稠油的组成,并基于塔河超稠油的组成设计了4种油溶性降黏剂(脂肪族,芳香族,芳香族+脂肪族,极性化合物);综合采用LF-NMR方法、黏度分析、和浸泡稀释法评价了4种降黏剂对塔河超稠油的降黏效果。... 详细信息

采用低场核磁共振(LF-NMR)技术分析了塔河超稠油的组成,并基于塔河超稠油的组成设计了4种油溶性降黏剂(脂肪族,芳香族,芳香族+脂肪族,极性化合物);综合采用LF-NMR方法、黏度分析、和浸泡稀释法评价了4种降黏剂对塔河超稠油的降黏效果。原油族组分(SARA)分析结果验证了LF-NMR技术可以用于精确分析原油组成。除极性化合物降黏剂外,其余3种降黏剂均可使超稠油的黏度降低90%以上,降黏剂的降黏性能排序为:芳香族>脂肪族+芳香族混合物>脂肪族>极性化合物。芳香族降黏剂降黏效果最好,可将稠油黏度从61000 Pa·s(50℃)降低至14.897 Pa·s;具有溶解沥青质和防止沥青质聚集的能力。实验结果证明了LF-NMR不仅可以作为一种快速方便的方法分析原油组成,同时可以用于评价降黏剂效果,并且帮助分析降黏机理。

关键词：低磁场核磁共振(LF-NMR) 超稠油降黏剂原油组成降黏机理

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MORTl/FADD is involved in liver regeneration

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World Journal of Gastroenterology 2005年第46期11卷 7248-7253页

作者： Marcus Schuchmann Felix Rückert Jose F Garcia-Lazaro Andrea Karg Jürgen Burg Natalia Knorr Jürgen Siebler Eugene E varfolomeev David Wallach Wolfgang Schreiber Ansgar W Lohse Peter R Galle Department of Medicine University of Mainz Langenbeckstr.1Mainz 55101 Germany Institute of RadiologyUniversity of Mainz Langenbeckstr.1Mainz 55101Germany Institute of PathologyUniversity of Mainz Langenbeckstr. 1 Mainz 55101 Germany Department of MedicineUniversity of Mainz Langenbeckstr.1Mainz 55101Germany GenentechSouth San Francisco CAUnited States The Weizmann Institute of ScienceRehovot Israel Institute of RadiologyUniversity of Mainz Langenbeckstr.1Mainz 55101 Germany Department of Medicine University of Mainz Langenbeckstr.1Mainz 55101 Germany

AIM: To explore the role of the adaptor molecule in liver regeneration after partial hepatectomy (PH). METHODS: We used transgenic mice expressing an N-terminal truncated form of MORT1/FADD under the control of the albumin promoter. As previously shown, this transgenic protein abrogated CD95- and CD120a-mediated apoptosis in the liver. Cyclin A expression was detected using Western blotting. ELISA and RT-PCR were used to detect IL-6 and IL-6 mRNA, respectively. DNA synthesis in liver tissue was measured by BrdU staining. RESULTS: Resection of 70% of the liver was followed by a reduced early regenerative response in the transgenic group at 36 h. Accordingly, 36 h after hepatectomy, cyclin A expression was only detectable in wild-type animals. Consequently, the onset of liver mass restoration was retarded as measured by MRI volumetry and mortality was significantly higher in the transgenic group. CONCLUSION: Our data demonstrate for the first time an involvement of the death receptor molecule MORT1/ FADD in liver regeneration, beyond its well described role as part of the intracellular death signaling pathway.

关键词： MORT1/FADD CD95 TNF Apoptosis Liver regeneration

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