检索结果-内蒙古大学图书馆

Offshore technology Conference, OTC 2025

作者： Zhang, Jianbo Liu, Xiaoao Luo, Jiazheng Sun, Xiaohui Zhong, Jie Wang, Zhiyuan Huang, Weian Sun, Baojiang Wang, Xiao School of Petroleum Engineering China University of Petroleum East China Shandong Qingdao China Shandong Key Laboratory of Offshore Oil & Gas and Hydrates Development Shandong Qingdao China CNPC Engineering Technology R&D Company Limited Beijing China No.7 Oil Production Plant PetroChina Changqing Oilfield Company Shanxi Xian China College of Computer Science and Technology China University of Petroleum East China Qingdao China School of Materials Science and Engineering China University of Petroleum East China Qingdao China

ISBN: (纸本)9781959025610

during depressurization production of natural gas hydrate, the reformation of hydrate is likely to occur in the reservoir, hindering the efficient development of hydrate. Previous studies on the reformation of hydrate in the process of natural gas hydrate production were mainly focused on experimental research and numerical simulation under experimental conditions. In this work, a multi-field coupling flow model considering the effect of hydrate reformation during depressurization production of hydrate reservoir was established, and the accuracy of the model was verified by the field measured data. Meanwhile, the reformation characteristics of hydrate in the reservoir using the horizontal well depressurization production were simulated and investigated. The results show that the reformation of hydrate in the reservoir mainly occurs in the upper part and middle boundary of the hydrate decomposition zone during the depressurization production. Moreover, the smaller the pressure drop extent, absolute permeability and initial hydrate saturation, and the deeper the horizontal well, the larger the hydrate secondary formation zone in the reservoir, the faster the rate of hydrate reformation, and the greater the hydrate saturation caused by hydrate reformation would be, which would make the risk of flow blockage by reformed hydrate in the reservoir rise. The results of this study can provide theoretical support for the safe and efficient development of offshore natural gas hydrate. © 2025, Offshore technology Conference.

关键词： Offshore gas well production

来源：评论

学校读者我要写书评

暂无评论

Investigation of Acoustic Properties in Casing for Water-Filled Wells Pipe 24

Investigation of Acoustic Properties in Casing for Water-Fil...

引用

4th International Conference on Signal Processing and Communication technology, SPCT 2024

作者： Qu, Congfeng Liu, Binhui Guo, Xinchao Hu, Yuannong Chen, Jiandong Lin, Shengbo Wang, Zhongmiin China National Petroleum Corporation Engineering Technology R&D Company Limited Beijing China Hangzhou Applied Acoustic Research Institute Zhejiang Hangzhou China Jilin University Jilin Changchun China Institute of Automation Qilu University of Technology Shandong Jinan China

ISBN: (纸本)9798400710636

To enable long-distance communication within water injection well tubes, we leverage hydroacoustic communication technology for the required research. This study presents a theoretical analysis and experimental measurements of transmission attenuation in a steel pipe with a 110 mm diameter and 110 m length, fully filled with water. Based on the findings, it is recommended that acoustic signals be transmitted at frequencies no lower than 4346 Hz. Hydroacoustic signals were measured across frequency ranges of 2 kHz to 13 kHz and 4 kHz to 13 kHz, revealing average attenuation rates of 14 dB and 19 dB per 100 m, respectively. These values are lower than the geometric propagation attenuation observed in free space. As the frequency increases, attenuation also increases, in alignment with both theoretical predictions and empirical observations. The experimental results further demonstrate that the attenuation pattern in the frequency domain follows a logarithmic trend within the well pipe. © 2024 Copyright held by the owner/author(s).

关键词： Injection (oil wells)

来源：评论

学校读者我要写书评

暂无评论

From data to decisions: AI-Augmented geoscience and engineering in natural gas industry

引用

Natural Gas Industry B 2025年第2期12卷 101-109页

作者： Pang, Huiwen dong, Shaoqun Tan, Peng Wang, Hanqing Li, Jiabao College of Science China University of Petroleum (Beijing) Beijing 102249 China College of Artificial Intelligence China University of Petroleum (Beijing) Beijing 102249 China CNPC Engineering Technology R&D Company Limited Beijing 102206 China Petroleum Exploration and Production Research Institute SINOPEC Beijing 102206 China Resource Geophysics Academy Imperial College London London SW7 2BP United Kingdom

来源：评论

学校读者我要写书评

暂无评论

Optimization design of gas injection and brine discharge process parameters in salt cavern gas storage

International Journal of Thermofluids

引用

International Journal of Thermofluids 2025年 27卷

作者： Kang, Yi Yuan, Guangjie Guan, Yueyang Fu, Pan Yuan, Yuan Tian, Shouceng CNPC Engineering Technology R&D Company Limited Beijing China College of Petroleum Engineering China University of Petroleum Beijing China China State Key Laboratory of Oil and Gas Resources and Exploration Beijing China SouthWest Petroleum University Sichuan China

The gas injection and brine discharge technology, as a key technique in salt cavern construction, is crucial for effectively removing brine from the cavern to optimize storage capacity. However, during the later stage of gas injection and brine discharge, the presence of insoluble particles in the salt rock formation poses a risk of clogging the brine discharge pipe as the pipe extends deeper into the cavern to maximize brine removal. To address this, numerical simulations using Fluent software were conducted, employing the enhanced realizable k-epsilon turbulent model and Eulerian multiphase flow model to analyze the transport behavior of gas, liquid, and solid phases in the salt cavern, as well as the gas injection and brine discharge strategies. By integrating numerical simulations with orthogonal experimental methods, the influence of gas injection pressure and brine discharge pipe diameter on the gas injection and brine discharge process was investigated. The results indicate that, under higher gas injection pressures, particularly at 14 MPa, the risk of brine discharge pipe clogging due to sediment deposition at the pipe inlet is reduced, with lower sediment mound heights observed. Additionally, smaller brine discharge pipe diameters, such as 114.3 mm, result in decreased sediment mound heights and reduced risk of pipe clogging. These findings provide theoretical insights and technical guidance for practical applications and construction practices in the field. © 2025

关键词： Caves

来源：评论

学校读者我要写书评

暂无评论

Thermosensitive core-shell polymer microspheres for enhanced wellbore stability in deep-water water-based drilling fluids

引用

Journal of Molecular Liquids 2025年 418卷

作者： Wang, Zhongyi Sun, Jinsheng Lv, Kaihe Lu, Haiying Geng, Yuan Huang, Xianbin Shandong Qingdao266580 China CNPC Engineering Technology R&D Co. Ltd. Beijing102206 China PetroChina Tarim Oilfield Branch Korla Xinjiang841000 China

The particular geological conditions present in deepwater wells, including specialised stratigraphic depositional processes, low mudline temperatures and high bottomhole temperatures, present a significant challenge to the construction of drilling rigs. This problem places new demands on the temperature resistance and wellbore stability performance of deepwater water-based drilling fluids. In this study, a thermosensitive core–shell polymer microsphere, NVPS, was prepared with a d50 value of 2.42 μm and a pronounced core–shell structure, which is capable of withstanding temperatures up to 180℃. At a concentration of 2 wt% of NVPS, the roll recovery at 180℃/16 h reached 98.53 % (22.95 % in clear water), and the linear expansion at 24 h was only 32.77 % (69.34 % in clear water). The material exhibited a pronounced hydration inhibition effect. The contact angle of water on the surface of shale chips treated at 180℃/16 h was 131.7° (53.9° for shale chips treated at 25℃/16 h) at a NVPS concentration of 2 wt%. It was demonstrated that NVPS produces a significant thermosensitive effect at elevated temperatures, which significantly enhances the hydrophobicity of the wellbore surface. The organic carbon adsorption of shale chips was found to be 108.11 mg/g (0.1338 mg/g in clear water) following hot rolling of the shale chips in an NVPS aqueous solution at 180℃ for 16 h. This indicates the presence of NVPS adsorption on the surface of the shale chips. The micromorphological analysis demonstrated that NVPS is capable of effectively adsorbing and residing on the surface and within the pores of a range of media. It was observed that NVPS can effectively adsorb and reside in the pore space. The thermosensitive groups in the shell layer of NVPS produce a thermosensitive effect when the temperature rises, which enhances the hydrophobicity and forms a wide and dense hydrophobic layer. This process hinders the intrusion of water molecules and inhibits the hydration and swelling of cl

关键词： Microspheres

来源：评论

学校读者我要写书评

暂无评论

Modeling transport and bridging behavior of lost circulation materials in a hydraulic fracture

引用

Journal of rock Mechanics and Geotechnical engineering 2025年第5期17卷 2650-2664页

作者： Cheng, Shaoyi Wu, Bisheng Huppert, Herbert E. Ma, Tianshou Chen, Zhaowei Tan, Peng State Key Laboratory of Hydroscience and Engineering Department of Hydraulic Engineering Tsinghua University Beijing 100084 China Key Laboratory of the Hydrosphere Sciences of the Ministry of Water Resources Beijing 100084 China Institute of Ocean Engineering Tsinghua University Beijing 100084 China Institute of Theoretical Geophysics King's College University of Cambridge Cambridge CB2 1ST United Kingdom State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University Sichuan Chengdu 610500 China CNPC Engineering Technology R&D Company Limited Beijing 102206 China

Lost circulation of drilling fluid is one of the most common and costly problems in drilling operations. This highlights the importance of wellbore strengthening treatment sthat can utilize lost circulation materials (LCMs) to seal fractures associated with the wellbore. In this work, a numerical model accounting for the deformation of surrounding rock, fluid flow in the fracture, fracture propagation, and the transport of LCMs is presented to investigate the wellbore strengthening, from the fracture initiation to the fracture arrest, due to plugs formed by LCMs. The equations governing the rock deformation and fluid flow are solved by the dual boundary element method and the finite volume method, respectively. The transport of LCMs is solved based on an empirical constitutive model in suspension flow, and several characteristic quantities are derived by dimensional analysis. It is found that two dimensionless parameters, dimensionless toughness and normalized initial particle concentration, control the migration of LCM particles. The numerical results show that the dimensionless toughness influences the entrance and bridging of LCMs while the initial concentration controls the location of the particle bridging. When the initial concentration is larger than 0.8, the particle bridging tends to occur near the fracture entry. Conversely, when the initial concentration is less than 0.8, the particle bridging occurs near the fracture tip. This work provides an effective tool to predict the LCM transport and plugging in the wellbore strengthening process. © 2025 Institute of rock and Soil Mechanics, Chinese Academy of Sciences

关键词： Bridging location dimensional analysis Hydraulic fracture Lost circulation materials (LCMs) Particle bridging Wellbore strengthening

来源：评论

学校读者我要写书评

暂无评论

Study on the design method of distorted model testing for cementing casing string systems based on the similarity of stiffness and mass

Journal of Engineering Research (Kuwait)

引用

Journal of engineering research (Kuwait) 2025年

作者： Wang, Liyan Yin, Yiyong Qi, Linshan Qu, Congfeng Yu, Yongjin Liu, Binhui Xia, Xiujian College of Engineering China Agricultural University Beijing 100083 China CNPC Engineering Technology R&D Co. Ltd Beijing 102206 China

In the test design of large-scale scaled models (complete similarity models) of the cementing casing string systems (CCSS), the large length-diameter ratio of the casing string causes the wall thickness of model too thin to manufacturing. Therefore, this study proposes a test design method based on similarity in stiffness and mass for the unequal scale scaled models (distorted similarity models) of the CCSS. Firstly, a dynamic model of the CCSS is established and solved by the separation of variables method and modal superposition method. The accuracy of the dynamic model and the efficiency of the solution are verified by tests and finite element analysis respectively. Then, based on the dynamic model and its analytical solution, the equation analysis method is used to derive the similarity criteria for the complete similarity model of the system. Based on theoretical calculations, it is found that the predicted vibration characteristics and dynamic response results of the prototype system through the complete similarity model are highly accurate. To further solve the problem of difficulty in manufacturing complete similarity model tests with large scaling ratios, considering the similarity of the quality and stiffness of the CCSS, the similarity criteria for the distorted similarity model of the CCSS is derived. In order to achieve high accuracy in theoretical calculation and prediction, the length-diameter ratio of the model needs to be greater than 60. The correctness of predicting the prototype dynamic response through the distorted similarity criterion is verified through theoretical models and test, and a detailed process for designing the similarity model experiment of the CCSS is provided. Finally, robustness analysis, sensitivity analysis, and uncertainty analysis are conducted on the dynamic response and similarity criteria of the CCSS under different parameters. The analysis results indicate that the similarity criterion can accurately predict the vibrati

关键词： Cementing casing string system Complete similarity model distorted similarity model Equation analysis method Model test

来源：评论

学校读者我要写书评

暂无评论

Simulation of rock-Breaking Ability of Polycrystalline diamond Compact Cutter Based on rock Mechanics Experiment After Heat Treatment

引用

Journal of Energy resources technology, Part B: Subsurface Energy and Carbon Capture 2025年第2期1卷 021007页

作者： Yin, Qishuai Wen, Zhiliang ren, Laiao Qu, Ximo Li, Qianyu Zhou, Bo MOE Key Laboratory of Petroleum Engineering China University of Petroleum Beijing 102249 China China Oilfield Services Limited Tianjin 300451 China https://***/041qf4r12China University of Petroleum Beijing MOE Key Laboratory of Petroleum Engineering China University of Petroleum Beijing 102249 China CNPC Engineering Technology R&D Company Limited Beijing 102206 China

When drilling in geothermal and deep formations, the rock-breaking mechanism of high-temperature formations is not clear. In this work, mechanical tests of rocks subjected to high temperatures were carried out, and rock-breaking models of bottom hole thermal stress dispersion and polycrystalline diamond compact (PdC) cutter were established. Aiming at efficient rock breaking pursued by drilling in high-temperature formation, rock-breaking simulations of PdC cutters with different front rake angles under the condition of temperature and confining pressure changes were carried out based on critical penetration depth. The mechanism of rock breaking is analyzed from the point of view of stress variation in the process of brittle rock breaking. The study shows that rock plasticity is enhanced after high temperature, and the temperature difference between the drilling fluid and bottom hole will make the outer part of the bottom hole shrink obviously. Under the conditions of this study, the optimal rock-breaking angle of the PdC cutter is 20 deg. The confining pressure of deep high-temperature formation will hinder rock breaking at a lower value range, and rocks under high confining pressure are more prone to brittle fracture. The increase of rotational speed has an obvious promotion stage for efficient rock breaking, and too large rotational speed will result in low brittle rock-breaking efficiency. These works are helpful in understanding the efficient brittle rock-breaking mechanism in high-temperature drilling, and can provide references for tooth design and rotational speed optimization of PdC bits.

关键词： critical cutting depth high-temperature drilling parameter optimization numerical simulation geothermal energy petroleum wells-drilling/production/construction geomechanics

来源：评论

学校读者我要写书评

暂无评论

Intelligent evaluation of sandstone rock structure based on a visual large model

引用

Petroleum Exploration and development 2025年第2期52卷 548-558页

作者： rEN, Yili ZENG, Changmin LI, Xin LIU, Xi HU, Yanxu SU, Qianxiao WANG, Xiaoming LIN, Zhiwei ZHOU, Yixiao ZHENG, Zilu HU, Huiying YANG, Yanning HUI, Fang PetroChina Research Institute of Petroleum Exploration & Development Beijing 100083 China Artificial Intelligence Technology R&D Center of Exploration and Development CNPC Beijing 100083 China National Key Laboratory for Multi-resources Collaborative Green Production of Continental Shale Oil Daqing 163000 China PetroChina Tarim Oilfield Company Korla 841000 China Xinjiang Key Laboratory of Ultra-deep Oil and Gas Korla 841000 China Research Institute of Petroleum Exploration and Development PetroChina Huabei Oilfield Company Renqiu 062552 China Peking University Beijing 100871 China PetroChina Changqing Oilfield Company No.6 Oil Production Plant Xi'an 710200 China

Existing sandstone rock structure evaluation methods rely on visual inspection, with low efficiency, semi-quantitative analysis of roundness, and inability to perform classified statistics in particle size analysis. This study presents an intelligent evaluation method for sandstone rock structure based on the Segment Anything Model (SAM). By developing a lightweight SAM fine-tuning method with rank-decomposition matrix adapters, a multispectral rock particle segmentation model named CoreSAM is constructed, which achieves rock particle edge extraction and type identification. Building upon this, we propose a comprehensive quantitative evaluation system for rock structure, assessing parameters including particle size, sorting, roundness, particle contact and cementation types. The experimental results demonstrate that CoreSAM outperforms existing methods in rock particle segmentation accuracy while showing excellent generalization across different image types such as CT scans and core photographs. The proposed method enables full-sample, classified particle size analysis and quantitative characterization of parameters like roundness, advancing reservoir evaluation towards more precise, quantitative, intuitive, and comprehensive development. © 2025 research Institute of Petroleum Exploration & development, PetroChina

关键词： fine-tuning intelligent evaluation particle edge extraction rock structure sandstone Segment Anything Model type identification

来源：评论

学校读者我要写书评

暂无评论

Suppressed grain boundary scattering effect to enhance electrical transport properties of La0.815Sr0.185MnO3 polycrystalline ceramic via high-temperature sintering process

引用

Ceramics International 2025年

作者： Liang, Xiaolu Chen, Zihao Wang, Zhenyu Pan, Zimeng Wang, Yao Wang, Haitao Sun, Jiankun Ma, Jun Jiang, Xuexing Peng, Jubo Gu, Xin Zhang, Jing Liu, Xiang Faculty of Material Science and Engineering Kunming University of Science and Technology Yunnan Kunming650093 China Kunming Kaihang Optoelectronic Technology Co. LTD Yunnan Kunming650200 China Company Limited R&D Center Yunnan Kunming650106 China

Polycrystalline La0.815Sr0.185MnO3 (LSMO) ceramic was synthesized using the sol-gel method. The effect of varying sintering temperatures (1763, 1783, 1803 and 1823 K) on the microstructure and electrical transport properties were systematically investigated. The samples exhibited a distinct dual-peak metal-insulator transition, with the first peak (Tp1) primarily influenced by grain boundary (GB) scattering effect. At lower sintering temperatures, lattice strain induced by the ionic size mismatch between La3+ and Sr2+ ions is transferred to the grain boundaries, increasing their contribution to resistivity. As the sintering temperature rises, the grain boundary effect diminish, leading to a suppression of the Tp1 peak. Elevated sintering temperatures further promote hybridization effect, enhancing the double exchange mechanism. As the temperature increases, this mechanism gradually becomes dominant, leading to a more pronounced influence of the Tp2 peak. Additionally, higher sintering temperatures reduce grain boundary scattering, improving the temperature coefficient of resistivity (TCr). At an optimal sintering temperature of 1803 K, the LSMO ceramic achieved a peak TCr of 10.78 % K−1 near room temperature (284.8 K), demonstrating strong potential for improved performance in uncooled infrared bolometers or electronic switch devices. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Sol-gel process

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：