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New technology for Improving Water Flooding Efficiency by Adjusting Advantage Channels 8th

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New Technology for Improving Water Flooding Efficiency by Ad...

8th International Field Exploration and development Conference, IFEdC 2019

作者： Shao, Li-ming Fang, Ping-liang Wei, Fa-lin dai, Ming-li Li, Wei-tao Research Institute of Petroleum Exploration and Development PetroChina Beijing100083 China CNPC Engineering Technology R&D Company Limited PetroChina Beijing100083 China

ISBN: (纸本)9789811524844

Underground cross-linking profile control and water shutoff and deep fluid flow to chemical agent system are usually composed of main agent, cross-linking agent and additives. The cost of cross-linking agent and additives generally accounts for 30–50% of the total cost of the system. Many inorganic salt ions are widely used as cross-linking agent or additives. In this paper, using Ca2+ and Mg2+ scale forming ion source in CaCl2 water type oilfield high salinity formation water (as water injection) as crosslinking agent, cross-linking of original inorganic microgel is carried out to reduce the cost of steering agent. The formation of nano microscale inorganic microgel with density similar to that of environmental water source can be formed by cross-linking of the steering agent with scale forming ions in formation water. The microgel can be dispersed or suspended in water, and gradually adsorbed on the rock skeleton of the dominant channel such as hole or crack to form a micro gel coating in order to narrow the flow dominant channel and form resistance to flow. The passage of plugging does not die, achieving the purpose of adjusting the dominant channel, expanding the volume and improving the efficiency of water flooding. At the same time, the particle size of the micro gel can prevent it from entering the low permeability matrix to contaminate the oil layer. The diversion agent has the characteristics of rapid dissolution, temperature resistance, salt resistance, environmental protection, long-term effectiveness and no construction risk. Field tests of deep profile control and flooding have been carried out in reservoirs with different temperature and salinity at home and abroad. After profile control diversion in test blocks or well groups, the effect of improving water flooding is good. The average increase of water injection pressure is 2–3 MPa, and the effective rate of increasing oil production and precipitation in oil wells is more than 80%, and the validity p

关键词： Chlorine compounds

deformation visualization in oil sand under water injection by using continuous photographic and dic technique 14th

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Deformation visualization in oil sand under water injection ...

14th International Congress on rock Mechanics and rock engineering, ISrM 2019

作者： Pang, Huiwen Jin, Yan dong, Jingnan Gao, Yanfang Wang, Shiyong Guo, Jiancheng State Laboratory of Petroleum Resources and Prospecting Key China University of Petroleum Beijing China CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9780367422844

This paper describes the physical laboratory experiment of oil sand under water injection, including experimental device, sample preparation, experimental design, operating procedure and the results of investigation of displacement sand grains of oil sand sample surface using a non-destructive method called digital Image Correlation (dIC) technique. A specially designed PMMA apparatus is developed to allow control confining pressure and pore pressure application on oil sand put inside it. The experimental procedure consists of an image collection process of images obtained with camera lens placed upon the PMMA slabs. The direction of water injection was always perpendicular to the lenses, and the injected water pressure and volume were recorded by computer. Then, dIC determined image motion was used to achieve displacement field and strain field of tested oil sand sample surface. Thus, the obtained displacement and strain fields could be used for numerical modeling experiments to guide mini-frac implement of oil sand deposit under water injection. © 2020 ISrM.

关键词： rock mechanics

Numerical Simulation of Slotted Screen Plugging Mechanism Based on Cfd-dem Coupling

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SSrN 2022年

作者： deng, Fucheng Gao, Zhiwei Cao, Yanfeng deng, Junyu Shen, Xuefeng School of Mechanics Engineering Yangtze University Hubei Jingzhou434000 China CNOOC Research Institute Beijing100028 China CNPC Engineering Technology R&D Company Limited Tianjin300457 China China Petroleum Technology and Development Corporation Beijing100028 China

As the simplest and commonly used mechanical sand control method in well completion, slotted screen sand control is used for filling sand control, independent sand control in thermal production wells or geothermal wells. In order to explore the plugging mechanism of slotted screen and the factors affecting sand production during sand control, the CFd-dEM coupling method is used in this paper. The discrete element method is used to establish the model considering the physical properties of sand particles in the formation, and the fluid flow model is established combined with the finite volume method, and the full coupling solution of the two is realized and the model verification is completed. The effects of particle size distribution, sand concentration, slotted size and fluid velocity on slotted screen plugging are studied, and the plugging mechanism of slotted screen is revealed. The following research results are obtained. First, the retention form of sand particles at the screen gap is the fundamental factor affecting screen plugging. Sand bridging will have a certain probability of collapse, resulting in "false stability". Second, the proportion of larger diameter sand determines the formation time and stability of "sand bridge", and the proportion of smaller diameter sand determines the compactness of solid retention. Third, sand concentration is very important to control the plugging removal frequency of screen. Fourth, the gap size and fluid velocity affect the pressure difference on the screen surface and the stability of the "sand bridge". This study provides a reference for optimizing the selection and production control of slotted screen during the downhole sand control design. © 2022, The Authors. All rights reserved.

关键词： Sand

depersing Tib2 Nanoparticles in Al Composites Via Ultrasonic Assisted Fast Cooling Schemes

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SSrN 2024年

作者： Chen, Jian Geng, Jiwei Li, Yugang Li, Keneng Xia, Peikang Li, Xianfeng Wang, Fangming Chen, dong Wang, Mingliang Wang, Haowei State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University No. 800 Dongchuan Road Shanghai200240 China Anhui Provincial Industrial Generic Technology Research Center for Alumics Materials Huaibei Normal University Huaibei235000 China Anhui Provincial Engineering Research Center of Aluminium Matrix Composites Huaibei235000 China CNPC Engineering Technology R&D Company Limited Beijing102206 China

Particle agglomeration poses the principal challenge in solidification of particulate reinforced metal matrix nanocomposites (MMNCs). Here we present an approach aimed at achieving a uniform distribution of nanoparticles (NPs) in aluminum matrix via a combination of ultrasonic dispersion and fast cooling processing. Microstructure analysis reveals that the distribution of NPs in the matrix transforms from intergranular distribution to intergranular distribution at the microscale and the interface between NP and the matrix changes from incoherent to coherent at the nanoscale under the action of ultrasonic melt treatment. Theoretical analysis underscores the significance of NP size and cooling rate as the two prominent factors influencing NP distribution during the solidification of nanocomposites. Through the ultrasonic dispersion of NPs and particle engulfment during the fast cooling process, the ductility of highly dispersed nanocomposites exhibits significant enhancement, with an increase of 82.7% and 18.4% compared to that of pure aluminum and non-ultrasonic-treated samples, respectively. © 2024, The Authors. All rights reserved.

关键词： Nanoparticles

Experimental Study on Evaluation of Propped Fracture Conductivity of Conglomerate reservoir in Baikouquan Formation of Ma-A Well Area of Xinjiang Oilfield

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SSrN 2022年

作者： Wang, Zhenyu Lin, Botao Chen, Gang dai, Yifan Chen, Ang State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Beijing102249 China College of Artificial Intelligence China University of Petroleum Beijing102249 China CNPC Engineering Technology R&D Company Limited Beijing102249 China CNPC Engineering Technology Research Institute of Xinjiang Oilfield Xinjiang834000 China

In recent years, Mahu tight conglomerate reservoir has been a critical area of Xinjiang oilfield development. Extensive displacement fracturing with ceramsite as a single proppant can not form propped fractures with high conductivity. Therefore, to determine how to create propped fractures with high conductivity. In this paper, a series of studies have been carried out in the Mahu glutenite reservoir by combining laboratory experiments with a field analysis. Indoor large-scale actual triaxial test analyzed the influence of stress difference, construction displacement, and natural weak plane on fracture initiation and propagation. The proppant conductivity evaluation experiment takes quartz sand and ceramsite as the research objects and evaluates the influence on fracture conductivity, including sand laying concentration, single or mixed proppant, proppant embedding, and crushing degree. The selection standard of proppant in the Mahu glutenite reservoir is clarified, which provides a theoretical basis for selecting proppant in subsequent field production. On the one hand, according to the theoretical understanding obtained from laboratory experiments, guidance and improvement are provided for the late construction scheme and some production processes. On the other hand, the variable displacement fracturing method can use small displacement communication with a weak side. © 2022, The Authors. All rights reserved.

关键词： Proppants

Evaluation of dynamic inter-well connectivity by using the state-variable-capacitance model

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Petroleum Science 2025年

作者： Li-Wen Guo Shi-Yuan Qu Yuan-Yuan Lei Zhi-Hong Kang Shuo-Liang Wang School of Energy Resources China University of Geosciences Beijing 100083 China CNPC Engineering Technology R&D Company Limited Beijing 100083 China

during oilfield development, a comprehensive model for assessing inter-well connectivity and connected volume within reservoirs is crucial. Traditional capacitance (TC) models, widely used in inter-well data analysis, face challenges when dealing with rapidly changing reservoir conditions over time. Additionally, TC models struggle with complex, random noise primarily caused by measurement errors in production and injection rates. To address these challenges, this study introduces a dynamic capacitance model (SV-dC) based on state variables. By integrating the extended Kalman filter (EKF) algorithm, the SV-dC model provides more flexible predictions of inter-well connectivity and time-lag efficiency compared to the TC model. The robustness of the SV-dC model is verified by comparing relative errors between preset and calculated values through Monte Carlo simulations. Sensitivity analysis was performed to compare the model performance with the benchmark, using the Qinhuangdao Oilfield as a case study. The results show that the SV-dC model accurately predicts water breakthrough times. Increases in the liquid production index and water cut in two typical wells indicate the development time of ineffective circulation channels, further confirming the accuracy and reliability of the model. The SV-dC model offers significant advantages in addressing complex, dynamic oilfield production scenarios and serves as a valuable tool for the efficient and precise planning and management of future oilfield developments.

关键词： Capacitance model Inter-well connectivity Time-lag coefficient Connected volume reservoir simulation

An On-Line Inductance Identification Method for Permanent Magnet Synchronous Motors Under Sensorless Control in The Full Speed domain

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An On-Line Inductance Identification Method for Permanent Ma...

International Conference on Power Electronics and Motion Control (IPEMC)

作者： Yue Liu Liguo Wang Qiang Gao Yong Li Fei E Department of Electrical Engineering Shanghai Jiao Tong University Shanghai China State Grid Suzhou Power Supply Company Substation Maintenance Center Suzhou China Department of R&D Contemporary Amperex Electric Vessel Technology Co. Limited Ningde China Department of Technology Contemporary Amperex Electric Vessel Technology Co. Limited Ningde China

ISBN: (数字)9798350351330

ISBN: (纸本)9798350351347

This work presents an online inductance identification method for permanent magnet synchronous motors in the full speed domain. Online inductance estimation is realized by injecting two modified high-frequency square wave voltage signals into the d-q axis simultaneously. This method can achieve high-precision identification of inductance in the full sensorless speed domain. The simulation results show that the inductance identification accuracy of this method can reach ±4% whether under constant loading, sudden addition and subtraction loading or dynamic loading.

关键词： Inductance Accuracy Simulation Loading Asia Estimation Sensorless control

Microscopic Molecular Insights into Methane Hydrate Growth on the Surfaces of Clay Minerals: Experiments and Molecular dynamics Simulations

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SSrN 2022年

作者： Wang, ren Liao, Bo Wang, Jintang Sun, Jinsheng Wang, Yudou Wang, Jianlong Wang, Qibing Qu, Yuanzhi Cheng, rongchao CNPC Engineering Technology R&D Company limited Beijing102206 China Ministry of Education Qingdao266580 China School of Petroleum Engineering China University of Petroleum Qingdao266580 China School of Science China University of Petroleum Qingdao266580 China

Clay is widely present in hydrate reservoirs and drilling and completion fluids. A quantitative understanding of hydrate growth characteristics on clay solid phase surfaces is vital for predicting hydrate formation and preventing secondary hydrate generation in solid-phase-containing drilling fluid systems. The experiments and nonequilibrium molecular dynamics simulations are performed to investigate the characteristics of methane hydrate growth on the surfaces of kaolinite and montmorillonite. The experiments and dynamics simulated results demonstrate that a large number of bound waters is absorbed on the clay surface. However, the bound water does not participate in hydrate formation. The mechanisms by which clay minerals influence the formation of hydrates are different. Kaolinite reduces the induction time of hydrate formation, but the massive amount of bound water on the kaolinite surface reduces the total amount of free water molecules, which hinders the formation of hydrates, and the inhibition effect on hydrates is more significant than that with montmorillonite. Significantly, the hydrolysis of interlayer cations on the montmorillonite surface inhibits the formation of hydrates. This study will help us to understand the mechanism for formation gas hydrates on reservoir clay minerals, and to predict the amount of hydrate reservoir reserves, which will further aid hydrate resource drilling and exploration. © 2022, The Authors. All rights reserved.

关键词： Molecular dynamics

research on small molecule wetting agent for drilling fluids applied in Antarctic drilling engineering

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Petroleum Science 2025年

作者： Huang, Ning Sun, Jin-Sheng Liu, Jing-Ping Lv, Kai-He deng, Xue-Fei Yi, Hai-Jiang Shandong Qingdao266580 China CNPC Engineering Technology R & D Company Limited Beijing102206 China

Antarctica contains numerous scientific mysteries, and the Antarctic ice sheet and its underlying bedrock contain important information about the geological structure of Antarctica and the evolutionary history of the ice sheet. In order to obtain the focus of these scientific explorations, the Antarctic drilling engineering is constantly developing. The drilling fluid performance directly determines the success or failure of drilling engineering. In order to enhance the poor performance for drilling fluids due to poor dispersion stability and easy settling of organoclay at ultra-low temperatures, the small-molecule wetting agent (HSr) for drilling fluid suitable for Antarctica was prepared by oleic acid, diethanolamine and benzoic acid as raw materials. Its chemical structure, properties and action mechanism were investigated by various experimental methods. The experimental results showed that 2% HSr could improve the colloidal rate for drilling fluid from 6.4% to 84.8%, and the increase rate of yield point was up to 167%. Meanwhile, it also made the drilling fluid excellent in shear dilution and thixotropy. In addition, 2% HSr could increase the density from 0.872 to 0.884 g/cm3 at −55 °C. And the drilling fluid with 2% HSr had a good thermal conductivity of 0.1458 W/(m·K) at −55 °C. This study gives a new direction for the research of drilling fluid treatment agents suitable for the Antarctic region, which will provide strong support for the scientific exploration of the Antarctic region. © 2025 The Authors

关键词： drilling fluids