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A hybrid WUDT-NAFnet for simultaneous source data deblending

Petroleum Science 2024年第3期21卷 1649-1659页

作者： Chao-Fan Ke Shao-Huan Zu Jun-Xing Cao Xu-Dong Jiang Chao Li Xing-Ye Liu Key laboratory of Earth Exploration and Information technology of Ministry of Education Chengdu University of Technology State Key laboratory of oil and Gas Reservoir Geology and Exploitation Chengdu University of Technology College of Geophysics Chengdu University of Technology

Simultaneous source technology,which reduces seismic survey time and improves the quality of seismic data by firing more than one source with a narrow time interval,is compromised by the massive blended ***,deblending algorithms have been developed to separate this ***,deep learning(DL)has been proved its great potential in suppressing the *** most popular DL method employs neural network as a filter to attenuate the blended noise in an iterative estimation and subtraction framework(IESF).However,there are still amplitude distortion and blended noise residual problems,especially when dealing with weak signal submerged in strong *** address these problems,we propose a hybrid WUDT-NAFnet,which contains two *** first network is a wavelet based U-shape deblending transformer network(WUDTnet),incorporated into IESF as a robust regularization term to iteratively separate the blended *** second network is a nonlinear activate free network(NAFnet)designed to recover the event amplitude and further suppress the weak noise residual in *** the hybrid network,the blended noise can be separated purposefully and *** using synthetic and field seismic data demonstrate that the WUDTNAFnet outperforms traditional curvelet transform(CT)based method and the deblending transformer(DT)model in terms of ***,for field applications,the data augmentation method of bicubic interpolation is applied to mitigate the feature difference between synthetic and field ***,the trained network exhibits strong signal preservation ability in numerical field example without requiring additional training.

关键词： Simultaneous-source Deblending Deep learning Transformer

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Ca and Sr co-doping induced oxygen vacancies in 3DOM La_(2-x)Sr_(x)Ce_(2-y)CayO_(7-δ)catalysts for boosting low-temperature oxidative coupling of methane

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Journal of Energy Chemistry 2024年第4期91卷 331-344页

作者： Tongtong Wu Yuechang Wei Jing Xiong Yitao Yang Zhenpeng Wang Dawei Han Zhen Zhao Jian Liu State Key laboratory of Heavy oil Processing China University of PetroleumBeijing 102249China Key laboratory of Optical Detection technology for oil and Gas China University of PetroleumBeijing 102249China

It is urgent to develop catalysts with application potential for oxidative coupling of methane(OCM)at relatively lower ***,three-dimensional ordered macro porous(3 DOM)La_(2-x)Sr_(x)Ce_(2-y)CayO_(7-δ)(A_(2)B_(2)O_(7)-type)catalysts with disordered defective cubic fluorite phased structure were successfully prepared by a colloidal crystal template method.3DOM structure promotes the accessibility of the gaseous reactants(O2and CH4)to the active *** co-doping of Ca and Sr ions in La_(2-x)Sr_(x)Ce_(2-y)CayO_(7-δ)catalysts improved the formation of oxygen vacancies,thereby leading to increased density of surface-active oxygen species(O_(2)^(-))for the activation of CH4and the formation of C2products(C2H6and C2H4).3DOM La_(2-x)Sr_(x)Ce_(2-y)CayO_(7-δ)catalysts exhibit high catalytic activity for OCM at low temperature.3DOM La1.7Sr0.3Ce1.7Ca0.3O7-δcatalyst with the highest density of O_(2)^(-)species exhibited the highest catalytic activity for low-temperature OCM,i.e.,its CH4conversion,selectivity and yield of C2products at 650℃are 32.2%,66.1%and 21.3%,*** mechanism was proposed that the increase in surface oxygen vacancies induced by the co-doping of Ca and Sr ions boosts the key step of C-H bond breaking and C-C bond coupling in catalyzing low-temperature *** is meaningful for the development of the low-temperature and high-efficient catalysts for OCM reaction in practical application.

关键词： 3DOM catalysts Ca ions Sr ions Low-temperature oxidative couplingof methane Oxygen vacancies O_(2)^(-) species

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Research on the solid particle erosion wear of pipe steel for hydraulic fracturing based on experiments and numerical simulations

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Petroleum Science 2024年第4期21卷 2779-2792页

作者： Si-Qi Yang Jian-Chun Fan Ming-Tao Liu De-Ning Li Jun-Liang Li Li-Hong Han Jian-Jun Wang Shang-Yu Yang Si-Wei Dai Lai-Bin Zhang State Key laboratory of oil and Gas Equipment CNPC Tubular Goods Research Institute Key laboratory of oil and Gas Safety and Emergency technology China University of Petroleum oil Production technology Research Institute of Liaohe oilfield Company Tianjin Gas Storage Branch PetroChina Dagang Oilfield Company Petroleum Production Engineering Research Institute Daqing Oilfield Company

Erosion wear is a common failure mode in the oil and gas industry. In the hydraulic fracturing, the fracturing pipes are not only in high-pressure working environment, but also suffer from the impact of the high-speed solid particles in the fracturing fluid. Beneath such complex conditions, the vulnerable components of the pipe system are prone to perforation or even burst accidents, which has become one of the most serious risks at the fracturing site. Unfortunately, it is not yet fully understood the erosion mechanism of pipe steel for hydraulic fracturing. Therefore, this article provides a detailed analysis of the erosion behavior of fracturing pipes under complex working conditions based on experiments and numerical simulations. Firstly, we conducted erosion experiments on AISI 4135 steel for fracturing pipes to investigate the erosion characteristics of the material. The effects of impact angle, flow velocity and applied stress on erosion wear were comprehensively considered. Then a particle impact dynamic model of erosion wear was developed based on the experimental parameters, and the evolution process of particle erosion under different impact angles, impact velocities and applied stress was analyzed. By combining the erosion characteristics, the micro-structure of the eroded area, and the micro-mechanics of erosion damage, the erosion mechanism of pipe steel under fracturing conditions was studied in detail for the first time. Under high-pressure operating conditions, it was demonstrated through experiments and numerical simulations that the size of the micro-defects in the eroded area increased as the applied stress increased, resulting in more severe erosion wear of fracturing pipes.

关键词： Erosion wear Applied stress Particle impact dynamics Erosion mechanism

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Influence of supercritical CO_(2)on the physical property of tight sandstone

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Petroleum 2024年第3期10卷 520-526页

作者： Huan Peng Jian Yang Junliang Peng Huifen Han Xinghao Gou Yucheng Jia Yibo Li Valeriy Kadet Engineering technology Research Institute of Southwest oil&Gas Field Company PetroChinaChengdu610017China Key laboratory of oil&Gas Well Stimulation technology of Southwest oil&Gas Field Company Chengdu610017China State Key laboratory of oil&Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China Gubkin Russia State University of oil and Gas Moscow119991Russia

In low-pressure gas reservoirs,water-based fracture fluid is difficult to flowback,which is unfavorable for several tight sandstone gas reservoirs in the Sichuan Basin with low pressure and high permeability geological *** CO_(2)possesses a number of remarkable physical and chemical features,including a density near to water,a viscosity close to gas,and high *** CO_(2)fracturing is a new type of non-aqueous fracturing method that is favorable to fracturing flowback in low-pressure tight sandstone and has a wide range of *** discuss on whether supercritical CO_(2)fracturing with low pressure tight sandstone is *** sandstone cores from the Jinqiu gas field in the Sichuan Basin were used to study the influence of supercritical CO_(2)on the physical properties of sandstone *** CO_(2)was used to interact with tight sandstone samples,and then the changes in porosity,permeability,and rock microstructure of tight sandstone were observed under various time,pressure,and temperature *** the interaction between tight sandstone and supercritical CO_(2),new dissolution pores will appear,or the original pores will be increased,and the width of some natural fractures will also be increased,and the porosity will increase by 1.09%-8.85%,and the permeability will increase by 2.34%-21.26%,quantifying the influence of supercritical CO_(2)on physical properties of tight sandstone,and further improving the interaction mechanism between supercritical CO_(2)and tight *** study improves in the understanding of the tight sandstone-supercritical CO_(2)interaction mechanism,as well as providing an experimental foundation and technological guarantee for field testing and use of supercritical CO_(2)in low-pressure tight sandstone gas reservoirs.

关键词： Supercritical CO_(2) Low pressure tight sandstone Porosity Permeability Microstructure

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Application of fuzzy comprehensive evaluation method to assess effect of conformance control treatments on water-injection wells

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Petroleum 2024年第1期10卷 165-174页

作者： Hu Jia Pengwu Li Wei Lv Jianke Ren Chen Cheng Rui Zhang Zhengjun Zhou Yanbin Liang State Key laboratory of oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengduChina oil and Gas technology Research Institute PetroChina Changqing Oilfield CompanyXi'anChina oil Production technology Institute of PetroChina Dagang oilfield Company TianjinChina

As an effective method to prolong the life of mature field,conformance control in water-injection well has been used ***,effect evaluation of conformance control has attracted great attention because it is an important guideline for the design of later enhanced oil recovery(EOR)***,production responses such as excessive water reduction and oil production increment are widely used as the ***,production responses may be unreliable due to the difficulty in determining an effective injection well which is caused by a large number of treated water-injection wells in a well ***,with the application of fuzzy comprehension evaluation(FCE),five evaluation indexes(injection pressure,injectivity index,slope of hall curve,variation coefficient and homogenization coefficient of injection profile)describe injection responses were selected to establish a new evaluation method in this *** on fuzzy mathematics,FCE reflects the difference of evaluation ***,weights of evaluation indexes were obtained by analytic hierarchy process(AHP),which made the results more *** Bai 239 oilfield as an example,the five injection responses indexes were used to assess treatment effect on five water-injection wells by single index evaluation and *** results showed that among the five evaluation indexes mentioned above,the slope of hall curve was the most important factor affected evaluation *** single index evaluation,opposite results may be produced easily on account of the one-sidedness of single index or human ***,we found that effective treatment was a relative concept *** result of FCE was consistent with single index evaluation but FCE was more *** study suggests that FCE could be applied to another field such as water flooding,acidizing and hydraulic fracturing.

关键词： Enhanced oil recovery Injection responses Fuzzy mathematics Analytic hierarchy process Effect evaluation

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Experimental study on wax deposition of highly paraffinic oil in intermittent gas-oil flow in pipelines

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Petroleum Science 2024年第3期21卷 2080-2088页

作者： Chuan-Shuo Wang Qian-Li Ma Xiao-Fang Lv Jie Zhang Yang Liu Shi-Dong Zhou Jiangsu Key laboratory of oil and Gas Storage and Transportation technology Changzhou UniversityChangzhou213164JiangsuPR China Hade oil and Gas Development Department Tarim Oilfield BranchKorla841000XinjiangPR China

oil-gas two phase wax deposition is a fairly common and open-ended question in flow assurance of multiphase transportation *** paper investigated the two main aspects of oil-gas two phase wax deposition layer:apparent thickness and crystal structure characteristics.A typical highly paraffinic oil in Bohai Sea,China,was used as the experimental material to investigate the wax deposition thickness in oil-gas two phase under the influence of different oil temperatures,superficial gas/liquid phase velocities and gas-oil ratios by using multiphase flow loop experimental *** as in the classical theory of wax molecular diffusion,it showed that wax deposition thickness of oil-gas two phase increased with increasing oil *** of the impact of different superficial phase velocities found that the actual liquid flow heat transfer and shear stripping was the gas phase dominant mechanisms determining wax deposit *** addition,the crystal structure of the wax deposition layer was characterized with the help of small-angle X-ray scattering(SAXS)for different circumferential positions,flow rates and gas-oil *** bottom deposition layer had a complex crystal structure and high hardness,which were subject to change over flow rate ***,the SAXS results provided evidence that the indirect effect of the actual liquid velocity modified by the gas phase was the main *** study of the effect of gas phase on the wax deposition of oil-gas two phase will help shed light onto the mechanism by which this important process *** findings address a very urgent need in the field of wax deposition of highly paraffinic oil to understand the flow security of oilgas two phase that occurs easily in multiphase field pipelines.

关键词： oil-gas two phase Highly paraffinic oil Wax deposition SAXS

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Evolution of tribo-magnetization during sliding of ferromagnetic materials

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Friction 2024年第5期12卷 906-918页

作者： Fumin GAO Laibin ZHANG Jin ZHOU Yi XIONG Jing WU Jianchun FAN China University of Petroleum-Beijing Beijing102249China Key laboratory of oil and Gas Safety and Emergency technology Ministry of Emergency ManagementBeijing102249China

Sliding-induced subsurface microstructure evolution is believed to be decisive for determining the friction and wear performance of metallic contacts as well as the development of *** expects to develop a new prediction method of wear state by elucidating the correlation between subsurface microstructure evolution and corresponding magnetic domain ***,subsurface microstructure evolution including crystal and magnetic domain under tribological action is investigated *** results demonstrate that dislocation mediated plastic deformation decisively influences microstructural changes during tribological contact,further determining the magnetic domain ***,sliding-induced plastic deformation causes an increase in the width of magnetic domains,but depth-dependent derived microstructure formed under severe plastic deformation such as the refined grains and sub-grains,in turn,promoted the refinement of magnetic domains and their discontinuity,forming depth-dependent magnetic domain *** results are helpful to clarify the evolution of tribo-magnetization and the pinning effect of dislocations on magnetic domains.

关键词： tribology magnetic domain microstructure tribo-magnetization dislocations

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Synergistic effects and kinetics analysis for co-pyrolysis of vacuum residue and plastics

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Frontiers of Chemical Science and Engineering 2024年第5期18卷 71-81页

作者： Chao Wang Xiaogang Shi Aijun Duan Xingying Lan Jinsen Gao Qingang Xiong State Key laboratory of Heavy oil Processing China University of Petroleum-BeijingBeijing 102249China State Key laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510640China

This study utilizedathermogravimetric analyzer to assess the thermal decomposition behaviors and kinetics properties of vacuum residue(VR)and low-density polyethylene(LDPE)*** kinetic parameters were calculated using the Friedman *** demonstrate the interactive effects between LDPE and VR during the co-pyrolysis process,the disparity in mass loss and mass loss rate between the experimental and calculated values was *** co-pyrolysis curves obtained through estimation and experimentation exhibited significantdeviations,whichwerei influencedby temperature and mixing ratio.A negative synergistic interaction was observed between LDPE and VR,although this inhibitory effect could be mitigated or eliminated by reducing the LDPE ratio in the mixture and increasing the ***-pyrolysisprocess resulted in a reduction in carbon residue,which could be attributed to the interaction between LDPE and the heavy fractions,particularly resin and asphaltene,present in *** findings align with the pyrolysis behaviors exhibited by the four VR ***,it was observed that the co-pyrolysis process exhibited lower activation energy as the VR ratio increased,indicating a continuous enhancement in the reactivity of the mixed samples during co-pyrolysis.

关键词： co-pyrolysis heavy residual oil polyethylene thermogravimetric analysis synergistic effects

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New insights into the DPR mechanism of elastic energy released by polymer gel for enhanced oil recovery

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Petroleum 2024年第3期10卷 539-547页

作者： Hu Jia Junyi Wu Shaowei Wu Yanbin Liang Minghao Wang Xiaojin Wan Pengwu Li State Key laboratory of oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengduChina CNOOC Zhanjiang Branch ZhanjiangChina oil Production technology Institute of PetroChina Dagang oilfield Company TianjinChina

Polymer gel was widely used as water shutoff agent in mature oil *** the results of single-phase plugging experiments show that the plugging rate of the polymer gel to the oil phase is lower than that of the water ***,the disproportionate permeability reduction(DPR)mechanism of polymer gels still remains *** this paper,we used four gel formulations including polyethyleneimine(PEI)and phenol-formaldehyde crosslinked gel with and without adding laponite to investigate the effect of gel elastic property on the water shutoff *** result of sand pack flooding experiments shown that the gel with higher elastic modulus has better effects on decreasing water cut and increasing oil *** adding laponite,the elastic modulus of phenol-formaldehyde crosslinked gel increased from 64.2 Pa to 192 Pa,and the elastic modulus of PEI crosslinked gel increased from 27.4 Pa to 36.5 *** to the phenol-formaldehyde-HAPM gel,the oil recovery of laponite-phenol-formaldehyde-HPAM gel increased by 5.2%and the maximum water cut decreased by 8.3%.Besides,comparing with PEI-HPAM gel,the oil recovery of laponite-PEI-HPAM gel increased by 2.7%and the water cut dropped by 27.8%.In the meanwhile,the laponite-phenol-formaldehyde-HPAM gel with higher elastic modulus obviously swells in the formation water but almost remains constant in oil at 105℃.The mass of gel soaked in the formation water increased from 42 g to 96 g and the gel volume increased by 300%within 48 *** study improves the understanding of the DPR mechanism of polymer gel for water shutoff.

关键词： Gel elasticity Water shutoff DPR Laponite oil recovery

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A phase-field model for simulating the propagation behavior of mixed-mode cracks during the hydraulic fracturing process in fractured reservoirs

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Applied Mathematics and Mechanics(English Edition) 2024年第5期45卷 911-930页

作者： Dan ZHANG Liangping YI Zhaozhong YANG Jingqiang ZHANG Gang CHEN Ruoyu YANG Xiaogang LI State Key laboratory of oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China State Key laboratory of oil and Gas Reservoir Geology and Exploitation Chengdu University of TechnologyChengdu 610059China Tarim oilfield Company PetroChinaBayingolin Mongolian Autonomous Prefecture 841000Xinjiang Uygur Autonomous RegionChina Wuqi oil Production Plant Shaanxi Yanchang PetroleumXi'an 716000China Exploration Division of PetroChina Southwest oil and Gasfield Company Chengdu 610041China

A novel phase-field model for the propagation of mixed-mode hydraulic fractures,characterized by the formation of mixed-mode fractures due to the interactions between fluids and solids,is *** this model,the driving force for the phase field consists of both tensile and shear components,with the fluid contribution primarily manifesting in the tension driving *** displacement and pressure are solved simultaneously by an implicit *** numerical solution's iterative format is established by the finite element discretization and Newton-Raphson(NR)iterative *** correctness of the model is verified through the uniaxial compression physical experiments on fluid-pressurized rocks,and the limitations of the hydraulic fracture expansion phase-field model,which only considers mode I fractures,are *** addition,the influence of matrix mode II fracture toughness value,natural fracture mode II toughness value,and fracturing fluid injection rate on the hydraulic fracture propagation in porous media with natural fractures is studied.

关键词： mixed-mode crack hydraulic fracturing poro-elasticity phase-field method(PFM)

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