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Latest Technological Progress in drilling and Completion Operations of the Unconventional reservoir in Xinjiang MaHu Oil Field and Key Suggestions for the Next Steps

Latest Technological Progress in Drilling and Completion Ope...

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2025 International Petroleum technology Conference, IPTC 2025

作者： Hu, Huaigang Xi, Chuanming Ji, Guodong Zhang, Nan Wu, Qiang Zhuo, Lubin Zou, Lingzhan CNPC Engineering Technology R&D Company Limited Beijing China National Engineering Research Center for Oil Gas Drilling and Completion Technology Beijing China Xinjiang Oilfield Engineering Technology R&D Company Limited Karamay China

ISBN: (纸本)9781959025436

due to the differences in sedimentary environments, compared with the exploitation of unconventional oil and gas resources in the United States and other countries, China has encountered greater difficulties in the drilling and completion processes of unconventional oil and gas. By analyzing the problems faced by drilling and completion in unconventional reservoirs in the MaHu area in recent years, the process of solving the issues and technical progress are summarized to form a technical template for drilling and completion in this area, which can also provide references for the next step to improve the drilling efficiency and reduce development costs. By studying the lateral distribution law of the pore pressure, the placement of the technical casing was optimized to further develop a standard design for the wellbore structure applicable to this area. To adapt to the local environmental protection requirements, high-performance non-sulfonic treatment agents were selected to replace sulfonic treatment agents, and four sets of environmental protection drilling fluid systems were formed. Based on the rock mechanics and field tests, the personalized drill bit is continuously optimized. With the introduction of a rotary steering drilling system and high-performance positive displacement motor (PdM), the rate of penetration (rOP) has been greatly improved. The transformation of horizontal Wells in the target Triassic formation from four types of casing strings with open hole completion + White oil-based/potassium-calcium based polysulfone organic salt drilling fluid to three types of casing strings with 5-inch casing completion + white-oil/potassium-calcium polyamine organic salt drilling fluid, from conventional rotary drilling + roller cone bit to rotary steering system/high-performance PdM +PdC bit, and the horizontal section length increased from 2000m to 2650m. Completion time decreased from an average of 144 days to 72 days. Speak of the Permian formation, the tra

关键词： Oil well completion

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An intelligent algorithm for identifying dropped blocks in wellbores

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Natural Gas Industry B 2025年第2期12卷 186-194页

作者： Wang, Qian Yang, Zixuan Ye, Chenxi Zhai, Wenbao Feng, Xiao CNPC Engineering Technology R&D Company Limited Beijing China National Engineering Research Center of Oil & Gas Drilling and Completion Technology Beijing China

real-time monitoring of wellbore stability during drilling is crucial for the early detection of instability and timely interventions. The cause and type of wellbore instability can be identified by analyzing the dropped blocks brought to the surface by the drilling fluid, enabling preventive measures to be taken. In this study, an image capture system with fully automated sorting and 3d scanning was developed to obtain the complete 3d point cloud data of dropping blocks. The raw data obtained were preprocessed using methods such as format conversion, down sampling, coordinate transformation, statistical filtering, and clustering. Feature extraction algorithms, including the principal component analysis bounding box method, triangular meshing method, triaxial projection method, local curvature method, and model segmentation projection method, were employed, which resulted in the extraction of 32 feature parameters from the point cloud data. An optimal machine learning algorithm was developed by training it with 10 machine learning algorithms and the block data collected in the field. The XGBoost algorithm was then used to optimize the feature parameters and improve the classification model. An intelligent, fully automated feature parameter extraction and classification system was developed and applied to classify the types of falling blocks in 12 sets of drilling field and laboratory experiments and to identify the causes of wellbore instability. An average accuracy of 93.9 % was achieved. This system can thus enable the timely diagnosis and implementation of preventive and control measures for wellbore instability in the field. © 2025 Sichuan Petroleum Administration

关键词： 3d scanning dropped block classification Feature extraction Machine learning Point cloud data Wellbore instability

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Ultralow-Vertical-Current Magnetization Switching Effect in an All Van der Waals 2d Heterostructure

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Chinese Physics Letters 2025年第2期42卷 239-248页

作者： Hao Wu Li Yang Gaojie Zhang Wen Jin Jie Yu Bichen Xiao Ahmed Annas Wenfeng Zhang Haixin Chang Center for Joining and Electronic Packaging State Key Laboratory of Material Processing and Die&Mold TechnologySchool of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Wuhan National High Magnetic Field Center and Institute for Quantum Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China Shenzhen R&D Center of Huazhong University of Science and Technology Shenzhen 518000China

The manipulation of magnetization and spin polarization using electrical currents represents a fundamental breakthrough in *** has formed the foundation for data storage and next-generation computing ***-transfer torque(STT)and spin-orbit torque(SOT)have emerged as prominent mechanisms in current-driven magnetization ***,these approaches typically require critical current densities in the range of 10^(6) to 10^(9) A·cm^(-2),resulting in significant heat generation during data writing ***,we report the discovery of an ultralow-vertical-current magnetization switching effect in a van der Waals ferromagnetic/ferroelectric heterostructure based on the modulation of the critical magnetic field(H_(C))using small vertical currents,with a critical current density as low as 1.81A·cm^(-2) and an average effective field(H_(eff)/J_(C))as high as 150.3mT·A^(-1)·cm^(2).This unique magnetization switching effect with ultralow-critical-vertical-current densities typically six to nine orders of magnitude lower than those of the STT and SOT provides a new transformative and viable pathway for developing next-generation spintronic and quantum technologies.

关键词： magnetization critical typically

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Mesoporous SiO2 nanoparticles with low surface energy and multilevel roughness as shale wellbore stabilizers in oil-based drilling fluid

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Petroleum Science 2025年第1期22卷 384-397页

作者： Hong-Yan du Kai-He Lv Jin-Sheng Sun Mei-Chun Li Yuan Geng Xian-Bin Huang Hao-Kun Shen Muhammad Arqam Khan School of Petroleum Engineering China University of PetroleumEast China Key Laboratory of Unconventional Oil & Gas Development Ministry of Education CNPC Engineering Technology R&D Company Ltd. Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and Engineering Nanjing Forestry University Department of Petroleum Engineering NED University of Engineering & Technology

Oil-based drilling fluids possess excellent properties such as shale inhibition, cuttings suspension, and superior lubrication, making them essential in the development of unconventional oil and gas ***, wellbore instability, caused by the invasion of drilling fluids into shale formations, remains a significant challenge for the safe and efficient extraction of shale oil and gas. This work reports the preparation of mesoporous SiO2nanoparticles with low surface energy, utilized as multifunctional agents to enhance the performance of oil-based drilling fluids aimed at improving wellbore stability. The results indicate that the coating prepared from these nanoparticles exhibit excellent hydrophobicity and antifouling properties, increasing the water contact angle from 32°to 146°and oil contact angle from 24°to134.8°. Additionally, these nanoparticles exhibit exceptional chemical stability and thermal *** these nanoparticles into oil-based drilling fluids reduced the surface energy of the mud cake from 34.99 to 8.17 m J·m-2and increased the roughness of shale from 0.26 to 2.39 μm. These modifications rendered the mud cake and shale surfaces amphiphobic, effectively mitigating capillary infiltration and delaying the long-term strength degradation of shale in oil-based drilling fluids. After 28days of immersion in oil-based drilling fluid, shale cores treated with MF-SiO2exhibited a 30.5% increase in compressive strength compared to untreated cores. Additionally, these nanoparticles demonstrated the ability to penetrate and seal rock pores, reducing the API filtration volume of the drilling fluid from11.2 to 7.6 m L. This study introduces a novel approach to enhance the development of shale gas and oil resources, offering a promising strategy for wellbore stabilization in oil-based drilling fluid systems.

关键词： Fluorosilane Wettability Wellbore stability drilling engineering Self-cleaning Antifouling

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Halophobic Prussian blue analogue electrodes for saturated saline water electrolysis

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Nano research 2025年第3期18卷 90-97页

作者： Wei Liu Jiage Yu Boyu ding Tianshui Li Shihang Li Xinlong Guo Linlin Zhou Benqiang Tian Yixin Zhang Yizhe Li Mengze Ma Kairui Wang Huijun Xin daojin Zhou Yun Kuang Xiaoming Sun State Key Laboratory of Chemical Resource Engineering College of ChemistryBeijing University of Chemical TechnologyBeijing 100029China Ocean Hydrogen Energy R&D Center Research Institute of Tsinghua University in ShenzhenShenzhen 518057China

Continuous seawater electrolysis is efficient for green hydrogen production,but some key issues have been *** example,the accumulated to saturated NaCl in electrolyte is poison to cathode by covering its surface and available active *** we demonstrate Pt/NiFe Prussian blue analogue(Pt/NiFePBA)electrode can continuously catalyze hydrogen evolution effectively at−500 mA·cm^(−2)in a 6 M NaOH electrolyte containing saturated NaCl,without being impeded by the formation of NaCl crystals on the electrode surface,which is in distinct contrast to commercial *** results indicate that Fe(CN)_(6)^(4−)spontaneously released by Pt/NiFePBA blocks the traditionally preferred basal plane growth of NaCl along{100}facets,but favors its growth along{110}basal *** alteration leads to an increased crystallization difficulty of NaCl near the electrode,rendering it halophobic(anti-NaCl precipitation)*** investigation should shed light on general salt involving process besides the practical implementation of seawater electrolysis.

关键词： seawater electrolysis saturate saline water hydrogen evolution reaction halophobic electrode Prussian blue analogue

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State surveillance and fault diagnosis of distillation columns using residual network-based passive acoustic monitoring

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Chinese Journal of Chemical engineering 2025年第1期77卷 248-258页

作者： Haotian Zheng Zhixi Zhang Guangyan Wang Yatao Wang Jun Liang Weiyi Su Yuqi Hu Xiong Yu Chunli Li Honghai Wang School of Chemical Engineering and Technology National-Local Joint Engineering Laboratory for Energy Conservation in Chemical Process Integration and Resources UtilizationHebei University of TechnologyTianjin 300130China School of Information Engineering Tianjin University of CommerceTianjin 300134China Coal Chemical R&D Center of Kailuan Group Tangshan 063007China

The operational state of distillation columns significantly impacts product quality and production ***,due to the complex operation and diverse influencing factors,ensuring the safety and efficient operation of the distillation columns becomes *** research combines passive acoustic monitoring with artificial intelligence techniques,proposed a technology based on residual network(resNet),which involves the transformation of the acoustic signals emitted by three distillation columns under different operating *** acoustic signals were initially in one-dimensional waveform format and then converted into two-dimensional Mel-Frequency Cepstral Coefficients spectrogram database using fast Fourier ***,this database was employed to train a resNet for the purpose of identifying the operational states of the distillation *** this approach,the operational states of distillation columns were *** faults,including flooding,entrainment,dry-tray,etc.,were diagnosed with an accuracy of 98.91%.Moreover,an intermediate transitional state between normal operation and fault was identified and accurately recognized by the proposed *** the transitional state,the acoustic signals achieved an accuracy of 97.85%on the resNet,which enables early warnings before faults occur,enhancing the safety of chemical production *** approach presents a powerful tool for the monitoring and diagnosis of chemical equipment,particularly distillation columns,ensuring the safety and efficiency.

关键词： distillation Column Acoustic signal Neural network

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A review to elucidate the influence of promoters on the acidity/basicity, reducibility, and metal-support interaction of catalysts in methane dry reforming

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Alexandria engineering Journal 2025年 127卷 309-335页

作者： Osazuwa, Osarieme Uyi Ng, Kim Hoong Department of Chemical Engineering Ming Chi University of Technology New Taipei24301 Taiwan Department of Chemical Engineering Faculty of Engineering University of Benin PMB 1154 Edo State Benin City Nigeria R&D Center of Biochemical Engineering Technology Ming Chi University of Technology New Taipei24301 Taiwan Battery Research Center of Green Energy Ming Chi University of Technology New Taipei24301 Taiwan Center for Environmental Sustainability and Human Health Ming Chi University of Technology New Taipei City24301 Taiwan

Past researches had identified the importance the acidity/basicity, reducibility, and metal-support interactions of catalyst in impacting its performances in methane dry reforming (Mdr). This review provides an in-depth overview of the roles of acidity/basicity in Mdr reactions, focusing on their impacts on reducibility and metal-support interactions. The discussion is categorized based on the incorporated promoter, including rare earth metals, transition metals, noble metals, and alkali earth metals. The acidity and basicity of catalysts play a crucial role in Mdr reactions. Brønsted acidic sites enhance catalyst activation, reducibility, and metal-support interaction, while Lewis acidic sites facilitate CH4 and CO2 activation more prominently. However, excessive acidity can lead to reduced reducibility and increased catalyst deactivation. Also, basic sites formed via basic metal oxides can enhance reducibility, metal-support interaction, and overall catalytic performance. A moderate level of basicity is favoured, as it can effectively modulate reducibility and metal-support interaction without inducing excessive metal dispersion or deactivation. Understanding the complex interplay between acidity and basicity is essential for designing high-performance Mdr catalysts with improved reducibility, metal-support interaction, stability, and activity. Future research directions include novel promoter developments, incorporation of machine learning, and investigation of catalyst deactivation mechanisms to ensure the sustainability of Mdr technology. © 2025 The Authors

关键词： Iron

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design of Edge-Modified hard carbon frameworks with embedded silicon as a high-performance anode for Lithium-Ion batteries

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Journal of Industrial and engineering Chemistry 2025年 148卷 532-540页

作者： Jang, Hangeol Park, Sang-Hoon Kang, dongWoo Lee, Seungmin Li, Oi Lun Han, Yu-Jin Ulsan Advanced Energy Technology R&D Center Korea Institute of Energy Research Ulsan44776 Cuba School of Materials Science and Engineering Pusan National University Busan46241 Cuba

Si-embedded hard-carbon composites (Si-EHCs) were synthesized as anode materials for high-energy–density lithium-ion batteries. Edge-modified hard carbon (EHC), derived by treating mangrove wood with heat and acid, was combined with Si using a mechanical coating method to form a robust Si-EHC composite structure. This design effectively mitigates the problematic volume expansion Si anodes undergo during cycling and enhances their electrochemical performance by increasing their capacity, charge/discharge rates, and long-term cycling stability. The integration of Si into a hard carbon matrix capable of fast charging/discharging, combined with the optimized carbon coating, offers a promising strategy for addressing key challenges induced by the volume expansion of Si, such as the formation of an unstable solid electrolyte interphase layer. This study highlights the importance of optimizing the design of the composite structure and offers valuable insights for developing high-performance Si/carbon composites with the potential for incorporation into various applications. © 2025 The Author(s)

关键词： Electrolytes

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Acetonitrile-driven universal CO production across diverse metal catalysts

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Science China Chemistry 2025年第5期68卷 2110-2116页

作者： Benqiang Tian Yan Xu Haoyang Wu Yang Zhong Marshet Getaye Sendeku Haijun Xu Yun Kuang Jiazhan Li Xiaoming Sun State Key Laboratory of Chemical Resource Engineering College of ChemistryBeijing University of Chemical Technology College of Energy Storage Technology Shandong University of Science and Technology Weichai Power Co. Ltd. Ocean Hydrogen Energy R&D Center Research Institute of Tsinghua University in Shenzhen College of Mathematics and Physics Beijing University of Chemical Technology

Electrocatalytic CO2reduction to valuable chemicals with exceptional selectivity is highly ***,it is still challenging to bypass the competitive hydrogen evolution reaction（HEr） and branched pathways via regulating the structure of ***,we disclose an unconventional solvent regulation strategy to realize near-unity CO2-to-CO conversion across diverse metal catalysts including Pt,Fe,Co,Ni,Mo,W,Nb,Cu,Ag,Au,Zn,Sn,and *** water content in the acetonitrile electrolyte is precisely controlled,and the ratio of hydrogen evolution shows a positive correlation to the hydrogen binding energy of metal elements and the concentration of ***,we find that the acetonitrile could impair the interaction between*CO and metal electrode and thus promote the desorption of**** a result,the Cu electrodes display poor activity to produce hydrocarbons in acetonitrile,unlike that in aqueous solutions,and near 100%CO Faradaic efficiencies over a wide potential window（-1.9 to -2.4 V vs. Fc/Fc+） are achieved at a water concentration of 0.19 *** work reveals the solvent effect on determining the CO2rr selectivity,which adds a new dimension to tailoring the final products besides catalyst optimization.

关键词： electrocatalytic CO2 reduction nonaqueous electrolytes CO production acetonitrile

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Comparative Study on Novel double-Stator Axial-Gap Flux-Modulating Hybrid-Field Consequent Pole Motors

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IEEJ Journal of Industry Applications 2025年第3期14卷 493-504页

作者： Mitsuda, Hiroshi Fukami, Tadashi Koyama, Masato Tanaka, Toshinori Advanced Technology R&D Center Mitsubishi Electric Corporation 8-1-1 Tsukaguchi-Honmachi Amagasaki661-8661 Japan Graduate School of Engineering Kanazawa Institute of Technology 7-1 Ohgigaoka Nonoichi921-8501 Japan

The flux-modulating hybrid-field consequent pole motor (FHCM) is a new type of double-stator axial-gap motor in which the field poles are composed of consequent poles and ring-shaped dC field windings. This paper proposes a field flux model to investigate the torque enhancement mechanism of the FHCM. The electromagnetic performance of the FHCM is also compared with that of three existing double-stator axial-gap flux modulating motors whose field poles are composed of permanent magnets, a field winding, or both of them, in addition to a standard radial-gap interior permanent magnet motor. Furthermore, experimental results are provided for a prototype machine to justify the theoretical and three-dimensional finite element analysis approaches. The results show that the FHCM can achieve both the highest efficiency and torque among the compared motors by adjusting the field current. © 2025 The Institute of Electrical Engineers of Japan.

关键词： AC motors

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