检索结果-内蒙古大学图书馆

Digital Twin System Utilizing Hybrid Approach of Physics Model and Machine Learning for Pipe Stuck Early Identification and Warning Based on Real-Time Data

Digital Twin System Utilizing Hybrid Approach of Physics Mod...

引用

2024 Offshore technology Conference Asia, OTCA 2024

作者： Zhang, Jiawei Wang, Haige Ji, Guodong Zhuo, Lubin Zhao, Zhixue Liu, Xiaoao Chen, Weifeng CNPC Engineering Technology R&D Company Limited Beijing China Drilling Engineering Technology Research Institute of CNPC Daqing Drilling Engineering Company Daqing China

ISBN: (纸本)9781959025030

Pipe stuck accident is one of the primary causes contributing to NPT (Non-Productive Time) in the drilling industry, incurring global financial losses amounting to hundreds of millions annually. For decades, Practices and techniques have been formulated and developed to avoid and tackle this downhole accident, while the early detection and proactive management are critical for effectively preventing this issue at its early stage. This paper presents the development and implementation of a novel digital Twin system, which amalgamates physics-based modeling and machine learning to facilitate real-time monitoring and early warning of pipe stuck while drilling. The system performs a real-time simulation of hook load, torque, and SPP (Standpipe Pressure) under various drilling states based on T&D and wellbore hydraulics models, which undergo verification and calibration within predefined computing cycles in order to enhance accuracy and reduce error margins. The PSRI (Pipe Stuck Risk), ranging from 0-100%, is based on ROC (Rate of change) of these three actual drilling parameters and the deviation of the simulated value from actual ones under different drilling states, is proposed to provide a comprehensive risk assessment over time series regardless of drilling state. A Continuous, real-time assessment of pipe stuck risk, categorized into low (green), medium (yellow), and high (red) levels, can be realized with thresholds for parameter deviation and ROC derived from historical data of wells with and without pipe stuck accidents and RFA (Random Forest Algorithm). The system is designed to alert users such as drillers or monitoring specialists with visual and auditory signals when a high-risk scenario is detected, prompting immediate preventative or corrective actions. Case studies have shown that the system could provide early warnings of high-risk of pipe stuck typically between 30 minutes to 2 hours ahead, particularly during back-reaming and tripping operation. This c

关键词：

来源：评论

学校读者我要写书评

暂无评论

Analysis of mechanical strengths of extreme line casing joint considering geometric, material, and contact nonlinearities

引用

Petroleum Science 2024年第3期21卷 1992-2004页

作者： Ji-Yun Zhang Chi Peng Jian-Hong Fu Quan Cao Yu Su Jian-Yun Pang Zi-Qiang Yu Petroleum Engineering School Southwest Petroleum UniversityChengdu610500SichuanChina Engineering Technology Research Institute of CNPC Southwest Oil and Gas Field Company Chengdu610017SichuanChina

To address the challenges associated with difficult casing running,limited annular space,and poor cementing quality in the completion of ultra-deep wells,the extreme line casing offers an effective solution over conventional ***,due to its smaller size,the joint strength of extreme line casing is reduced,which may cause failure when running in the *** address this issue,this study focuses on the CST-ZTΦ139.7 mm×7.72 mm extreme line casing and employs the elastic-plastic mechanics to establish a comprehensive analysis of the casing joint,taking into account the influence of geometric and material nonlinearities.A finite element model is developed to analyze the forces and deformations of the extreme line casing joint under axial tension and external collapse *** model investigates the stress distribution of each thread tooth subjected to various tensile forces and external ***,the tensile strength and crushing strength of the extreme line casing joint are determined through both analytical and experimental *** findings reveal that,under axial tensile load,the bearing surface of each thread tooth experiences uneven stress,with relatively high equivalent stress at the root of each thread *** end thread teeth are valuable spots for *** is observed that the critical fracture axial load of thread decreases linearly with the increase of thread tooth *** external pressure,the circumferential stress is highest at the small end of the external thread,leading to yield *** tensile strength of the joint obtained from the finite element model exhibits a relative error of less than 7%compared to the analytical and experimental values,proving the reliability of the finite element *** tensile strength of the joint is 3091.9 k ***,in terms of anti-collapse capability,the joints demonstrate higher resistance to collapse compared to the casing body,which is consistent with the test resul

关键词： Extreme line casing Elastic-plastic mechanics Finite element analysis Tensile strength Collapse strength

来源：评论

学校读者我要写书评

暂无评论

CCUS:A Panacea or a Placebo in the fight against climate change?

引用

Green Energy & Environment 2025年第2期10卷 239-243页

作者： Yuxin Zhao CNPC Tubular Goods Research Institute(TGRI) Xi'an710077China School of Mechanical Engineering Hebei University of TechnologyTianjin300401China

Carbon Capture,Utilization,and Storage(CCUS)is a crucial technology for achieving carbon neutrality,but it faces significant *** substantial investments and policy support,CCUS projects have underperformed due to technical difficulties,high costs,and controversies surrounding the fossil fuel industry's *** effectiveness and feasibility of CCUS in reducing carbon emissions remain *** viewpoint provides a comprehensive analysis of the current state of CCUS technology,examining its potential to reduce carbon emissions,the challenges hindering its deployment,and the strategies needed to overcome these *** discuss the need for a combinatorial approach to unlock CCUS's full potential,and also emphasize the importance of selecting optimal CO_(2)utilization pathways to maximize economic benefits and CO_(2)*** CCUS faces technical,economic,and social barriers,it can still play a valuable role in mitigating emissions from hard-to-abate sectors when supported by comprehensive strategies and collaborative efforts among governments,industries,and research *** addressing these challenges and investing in innovation,CCUS can contribute to achieving carbon neutrality and building a sustainable,low-carbon future.

关键词： CCUS Carbon neutrality Net-zero emissions Fossil fuel industry Sustainable development

来源：评论

学校读者我要写书评

暂无评论

Mechanism of Polycrystalline Diamond Compact and Diamond Impregnated Cutter Hybrid Bit Composite Rock Breaking

引用

Journal of engineering Science and technology Review 2023年第2期16卷 189-196页

作者： Yu, Jinping Ji, Guodong Wu, Qiang Wang, Qing Hu, Huaigang CNPC Engineering Technology R&D Co. Ltd Beijing102206 China

Rock breaking efficiency of drill bits is an important index for measuring the drilling efficiency in the oil and gas drilling field, and it is influenced by many factors, such as structure and material. This study developed a calculation model and an experimental model of rock breaking of polycrystalline diamond compact (PDC) and diamond impregnated cutter (DIC) hybrid bit to reveal the influence of bit structure and material on tangential force, axial force and wear height. On the basis of the calculation model of the co-rail arrangement of the PDC–DIC hybrid bit and the rock breaking mode, a rock breaking mechanical parameter prediction model and a rock breaking performance test model were established. Rock stress calculation method, rock failure criterion, and mechanical specific energy (MSE) calculation method were used to analyze the rock stress and the relationship between MSE and tangential force, axial force, and wear height during combined rock breaking. The accuracy of the model was verified by experiments. Results show that the specific work of rock breaking of the PDC-DIC hybrid bit is less than that of PDC, and a reverse nonlinear relationship exists between specific work of rock breaking and wear height. The energy required for hybrid bit to break rock is less than that of PDC bit. A positive nonlinear relationship exists between the energy of PDC-DIC hybrid bit and the wear height, whereas the cutting depth and the wear height show a negative nonlinear relationship. The stress distribution of PDC rock breaking is uniform, and the maximum equivalent stress is up to 104 MPa. The stress distribution of rock breaking of the hybrid PDC-DIC is extremely nonuniform, and stress concentration occurs with a minimum equivalent stress of 84 MPa and a maximum stress of 161 MPa, which is beneficial to rock breaking. Rock breaking of PDC-DIC hybrid bit can promote the generation and development of rock cracks, thereby reducing the crushing strength of the rock. The

关键词： Rocks

来源：评论

学校读者我要写书评

暂无评论

Numerical analysis of hydraulic fracture propagation in deep shale reservoir with different injection strategies

引用

Journal of Rock Mechanics and Geotechnical engineering 2024年第9期16卷 3558-3574页

作者： Yingjie Xia Mingyu Yao Tianjiao Li Hai Yang Chun'an Tang School of Civil Engineering Dalian University of TechnologyDalian116024China Deep Underground Engineering Research Center Dalian University of TechnologyDalian116024China CNPC Chuanqing Drilling Engineering Company Limited Chengdu610051China

Deep shale reservoirs are characterized by elevated breakdown pressures,diminished fracture complexity,and reduced modified volumes compared to medium and shallow ***,it is urgent to investigate particular injection strategies that can optimize breakdown pressure and fracturing efficiency to address the increasing demands for deep shale reservoir *** this study,the efficiency of various stimulation strategies,including multi-cluster simultaneous fracturing,modified alternating fracturing,alternating shut-in fracturing,and cyclic alternating fracturing,was ***,the sensitivity of factors such as the cycle index,shut-in time,cluster spacing,and horizontal permeability was ***,the flow distribution effect within the wellbore was *** results indicate that relative to multi-cluster simultaneous fracturing,modified alternating fracturing exhibits reduced susceptibility to the stress shadow effect,which results in earlier breakdown,extended hydraulic fracture lengths,and more consistent propagation despite an increase in breakdown *** alternating shut-in fracturing benefits the increase of fracture length,which is closely related to the shut-in ***,cyclic alternating fracturing markedly lowers breakdown pressure and contributes to uniform fracture propagation,in which the cycle count plays an important *** alternating fracturing demonstrates insensitivity to variations in cluster spacing,whereas horizontal permeability is a critical factor affecting fracture *** wellbore effect restrains the accumulation of pressure and flow near the perforation,delaying the initiation of hydraulic *** simulation results can provide valuable numerical insights for optimizing injection strategies for deep shale hydraulic fracturing.

关键词： Fracture propagation Numerical simulation Hydraulic fracturing Rock failure process analysis(RFPA) Injection strategy

来源：评论

学校读者我要写书评

暂无评论

Analysis of Hydraulic Fracture Network Morphology in Stimulated Coal Reservoirs with Pre-Existing Natural Fractures

引用

Energy engineering 2025年第4期122卷 1491-1509页

作者： Weiping Ouyang Luoyi Huang Jinghua Liu Hongzhong Zhang National Engineering Laboratory for Exploration and Development of Low-Permeability Oil and Gas Fields CNPC Chuanqing Drilling Engineering Company LimitedXi’an710018China Changqing Downhole Technology Company CNPC Chuanqing Drilling Engineering Company LimitedXi’an710018China School of Petroleum Engineering Yangtze UniversityWuhan430100China

Hydraulic fracturing is a crucial technique for efficient development of coal *** rocks typically contain a high density of natural fractures,which serve as conduits for fracturing *** injection,the fluid infiltrates these natural fractures and leaks out,resulting in complex fracture *** prediction of hydraulic fracture network propagation for coal reservoirs has important practical significance for evaluating hydraulic *** study proposes a novel inversion method for predicting fracture networks in coal reservoirs,explicitly considering the distribution of natural *** method incorporates three distinct natural fracture opening modes and employs a fractal probability function to constrain fracture *** on thismethod,the study compares hydraulic fracture networkmorphologies in coal reservoirs with andwithout the presence of natural *** showthatwhile both reservoir types exhibitmulti-branch fracture networks,reservoirs containing natural fractures demonstrate greater branching and a larger stimulated reservoir volume(SRV).Additionally,the study employs a fractal dimension calculation method to quantitatively describe the geometric distribution characteristics of *** analysis reveals that the geometry and distribution of natural fractures,as well as reservoir geological parameters,significantly influence the fracture networkmorphology and fractal *** contact angle between natural and hydraulic fractures affects propagation direction;specifically,when the contact angle isπ/2,the fractal dimension of the hydraulic fracture network is ***,smaller lengths and spacings of natural fracture led to higher fractal dimensions,which can significantly increase the *** proposed method offers an effective tool for evaluating the hydraulic fracturing of coal reservoirs.

关键词： Coal reservoirs hydraulic fracturing natural fractures inversion and evaluation fracturing fluid flow fractal dimension

来源：评论

学校读者我要写书评

暂无评论

Research and application of on-line testing technology for drilling fluid properties in Chuanyu deep well 7

Research and application of on-line testing technology for d...

引用

7th International Conference on Downhole Measurement and Control, ICDMC 2024

作者： Lu, Qi Xu, Jianchao Cai, Xiaocong Liu, Ke Drilling & Production Engineering Technology Research Institute CNPC Chuanqing Drilling Engineering China CCDC Chuanxi Drilling Company CNPC Chuanqing Drilling Engineering China

Viscosity measurement of drilling fluid while drilling is an important basis for real-time analysis of wellbore hydraulic characteristics and optimization of drilling parameters. When the current drilling fluid viscometer is used for on-line continuous detection, the drilling fluid is easy to settle and adhere to the measuring gap and stator end face, which affects the detection accuracy. This effect is particularly severe when measuring high density and high viscosity drilling fluids. Therefore, a larger measurement gap is more suitable for on-line inspection of the probe size. However, the larger measurement gap is more likely to produce eddy current and turbulence, which affects the detection accuracy. Therefore, based on Taylor Couette's law of small gap fluid dynamics, combined with indoor evaluation experiments, and considering key influencing factors such as size requirements, laminar flow constraints, motor driving force and rotor limit speed, two different sizes of detection structures were designed. The measured gap range is 0.102 ~ 0.146mm. Laboratory tests showed that the deposition and adhesion of drilling fluid in the measurement gap were significantly improved. A moment of inertia time-response model was established to determine the optimal reading time window: for standard fluid (GBW13607), the detection time was 33.7 seconds, and for drilling fluid (density ≤2.0g/cm3), the detection time was 67.4 seconds. The accuracy of on-line measurement of drilling fluid viscosity is ensured. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Laminar flow

来源：评论

学校读者我要写书评

暂无评论

Study on Perforation Erosion in Hydraulically Fractured Shale Gas Wells Through Downhole Video Imaging and Computational Fluid Dynamic Modelling

Study on Perforation Erosion in Hydraulically Fractured Shal...

引用

2024 SPE Asia Pacific Oil and Gas Conference and Exhibition, APOGCE 2024

作者： Yuan, L. Hu, S.L. Mu, L.Y. Wang, D.L. Yang, X.T. CNPC Oilfield Service Company Limited China CNPC Engineering Technology R&D Company Limited China

ISBN: (纸本)9781959025269

The limited-entry technology was a key technology in the multistage fracturing of shale oil and gas horizontal wells to help distribute fracture fluid among multiple perforation clusters evenly. However, perforations could be eroded and enlarged because of high-speed and continuous abrasion by the proppants, resulting in unequal inflow and uneven cracks propagation between perforation clusters, which caused low efficiency of the fracture treatment. Considering that the perforation erosion has not been fully understood yet, special attention should be paid to this aspect of research. In this work, post-fracturing perforations erosion images were collected by the downhole video imaging technology, which was employed to qualitatively analyze the geometrical morphology. Then, the erosion data (perforation diameter & perforation area) at different phases were utilized to quantitatively summarize the perforation erosion & chambering laws. Finally, perforation erosion models were built using computational fluid dynamics (CFD) to simulate the distribution of the flow field when high-speed fracturing fluid with proppants injected perforations, which would help interpret the analysis of the results. Based on above technics, the erosional pattern of perforation would be clearly revealed. One thousand and two perforation erosion images from medium to deep shale gas wells in Sichuan and Chongqing regions demonstrated that post-fracturing perforations appeared in four different geometrical morphology, including round (under-erosion, 10%), droplets (normal-erosion, 52%), near-droplets (over-erosion, 25%) and irregularity (abnormal-erosion,13%). Due to the influence of the proppant concentration profile, perforations located near the downside of the horizontal wellbore suffered more severe erosion, for example, the most eroded perforation was near phase 180 degree with an average diameter of 18.4 mm which was 1.8 times larger than that of perforations near phase 0 degree (10.4 mm).

关键词： Proppants

来源：评论

学校读者我要写书评

暂无评论

Effect of Montmorillonite on the Properties of Organic-Inorganic Composite Cross-Linked Polyacrylamide Gel System 13th

Effect of Montmorillonite on the Properties of Organic-Inorg...

引用

13th International Field Exploration and Development Conference, IFEDC 2023

作者： Zhang, Shi-Ling Qiao, Yan Ning, Kun Zhang, Yang Shang, Li-Tao Wang, Yan Hou, Teng-Fei Bai, Hao-Li CNPC Engineering Technology R and D Company Limited Beijing China Tarim Oilfield Company of CNPC Xinjiang China

ISBN: (纸本)9789819702633

The organic-inorganic composite cross-linking technology can effectively improve the temperature resistance of polyacrylamide gel systems. However, the effect of adding montmorillonite to the system and its impact on performance has not been studied. By using visual code method, differential scanning calorimetry (DSC), and other methods, the effects of montmorillonite on the temperature resistance, gelation properties, and microstructure of the organic-inorganic composite cross-linking polyacrylamide gel system were investigated. The microstructure of the gel system was analyzed by infrared spectroscopy and scanning electron microscopy (SEM). The results showed that the organic-inorganic composite cross-linking gel with different mass fractions of montmorillonite can effectively form a gel, which covers the three-dimensional network structure and does not damage the original spherical-tree structure. By changing the dosage of montmorillonite, it is found that the strength of the gel system is not only related to the density of the three-dimensional network structure, but also related to the composition of the network structure. The gelation time is approximately 21.0–22.0 h, with strength ranging from H to F level. The gel does not break down after high-temperature aging at 140 ℃ for 120 days, indicating good long-term thermal stability. The peak temperature of the differential scanning calorimetry increases with the increase of montmorillonite mass fraction. When the montmorillonite mass fraction is 2.5%, the peak temperature can reach 181 ℃. Adding montmorillonite can improve the performance of the organic-inorganic composite cross-linking polyacrylamide gel system, and can be used to prepare medium-strength gel systems for high-temperature oil and gas field profile control and water shut-off to further enhance the recovery rate. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Clay minerals

来源：评论

学校读者我要写书评

暂无评论

Hyperbranched polymer hollow-fiber-composite membranes for pervaporation separation of aromatic/aliphatic hydrocarbon mixtures

引用

Chinese Journal of Chemical engineering 2024年第5期69卷 13-22页

作者： Tong Liu Hao Sun Xiangqiong Wang Jie Li Zhanquan Zhang Pei Wu Naixin Wang Quanfu An Beijing Key Laboratory for Green Catalysis and Separation Department of Chemical EngineeringCollege of Materials Science and EngineeringBeijing University of TechnologyBeijing 100124China Petrochemical Research Institute CNPCBeijing 102206China

The separation of aromatic/aliphatic hydrocarbon mixtures is crucial in the petrochemical *** is regarded as a promising approach for the separation of aromatic compounds from alkanes. Developing membrane materials with efficient separation performance is still the main task since the membrane should provide chemical stability, high permeation flux, and selectivity. In this study, the hyperbranched polymer(HBP) was deposited on the outer surface of a polyvinylidene fluoride(PVDF)hollow-fiber ultrafiltration membrane by a facile dip-coating method. The dip-coating rate, HBP concentration, and thermal cross-linking temperature were regulated to optimize the membrane *** obtained HBP/PVDF hollow-fiber-composite membrane had a good separation performance for aromatic/aliphatic hydrocarbon mixtures. For the 50%/50%(mass) toluene/n-heptane mixture, the permeation flux of optimized composite membranes could reach 1766 g·m^(-2)·h^(-1), with a separation factor of 4.1 at 60℃. Therefore, the HBP/PVDF hollow-fiber-composite membrane has great application prospects in the pervaporation separation of aromatic/aliphatic hydrocarbon mixtures.

关键词： Aromatic/aliphatic hydrocarbons Hyperbranched polymer Pervaporation Hollow fiber membrane Dip-coating

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：