检索结果-内蒙古大学图书馆

SSrN 2023年

作者： ren, Zhengran Gao, Jinhua Wang, Jiawei Wen, Yang Hao, Shan Zhang, Han Engineering Technology Research Center for Municipal Sewage Reclamation R&D Center Beijing Drainage Group Co. Ltd. Beijing100124 China Tonghui River Basin Company Beijing Drainage Group Co.Ltd. Beijing100082 China

This study compared the performance of anaerobic sequencing batch reactor (ASBr) and continuous stirred tank reactor (CSTr) for biogas production from thermally hydrolyzed sludge. The influent total solids (TS) concentration was varied from 2%, 4%, 6%, to 8% at a thermal hydrolysis temperature of 160°C. The results showed that ASBr outperformed CSTr with an increase in biogas yield by 19.80%, 10.78%, and 13.98% at influent TS concentrations of 2%, 4%, and 6%, respectively. However, at an influent TS concentration of 8%, no significant difference was observed between the two reactors due to poor sludge settling in ASBr. At a thermal hydrolysis temperature of 170°C and an influent TS concentration of 8%, the biogas production in ASBr was 18.04% higher than that in CSTr, and sludge settling occurred in ASBr. Even with an HrT shortened to 8 days, ASBr still operated stably with a biogas yield of 256 L/kgTS at an influent TS concentration of 6% and thermal hydrolysis temperature of 160°C, which was only 7.25% lower than that at an HrT of 15 days. The biogas production in the anaerobic membrane bioreactor (AnMBr) increased by 6% compared to that in ASBr © 2023, The Authors. All rights reserved.

关键词： Biogas

A practical model for production forecast of fractured vertical well in coalbed methane reservoirs: dynamic-drainage-area concept

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A practical model for production forecast of fractured verti...

Offshore technology Conference Brasil 2019, OTCB 2019

作者： Sun, Zheng Wu, Keliu Shi, Juntai Fu, Jin Shao, Changchun Zhou, Yu Liu, Chengyuan Jia, Yanran Fang, Jinhui Lv, Ming China University of Petroleum at Beijing Texas A&M Univerisity United States China University of Petroleum at Beijing China CNPC Engineering Technology R&D Company Ltd Tarim Oilfield Branch China National Petroleum Corporation China

ISBN: (纸本)9781613996713

A great deal of attention has been attracted to the exploitation as well as the development of unconventional gas reservoirs, which expect to act as an essential role in counterpoising the daily increasing energy demand around the world. In this research, with the intent of contributing to the successful development of coalbed methane (CBM) reservoirs, which is an indispensable member of the family of unconventional gas reservoirs, a novel production prediction model is proposed for fractured vertical CBM wells. The main difference of the research compared with previous excellent documents is taking the effect of pressure propagation behavior on production performance of CBM wells into account. In general, CBM reservoirs possess the low-permeability ( © 2019, Offshore technology Conference

关键词： Forecasting

Experimental study on the synthesis and interfacial properties of oligomeric silicone surfactant

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Experimental study on the synthesis and interfacial properti...

SPE International Conference on Oilfield Chemistry 2019

作者： Jie, Zhang Xu, Xianguang Wang, Lihui Li, Long Zhang, die Zhao, Zhiliang Wang, Shuangwei CNPC Engineering technology R and D company limited China

ISBN: (纸本)9781613996331

Severe formation damage is induced by the invasion of working fluid and the subsequent water blocking. Surface modification by surfactant adsorption can change the wettability of the rock surface to enhance the removal efficiency of reservoir fluid and reduce the water blockage damage. Therefore, surfactant shows a good potential applicant in condense reservoir. In the current paper, an oligomeric silicone surfactant (OSSF) containing sulfonic acid groups is synthesized to improve the water flowback effect. The critical micelle concentration (CMC) is determined by equilibrium surface tension. Micelle can be formed above the CMC and its size and distribution increase with the concentration. At the same time, the surface tension increases with the aging temperature but decreases with the adding of inorganic salt. The OSSF adsorption through solid-liquid surface can change the surface chemical composition and transfer the wettability of reservoir from water-wet to gas-wet by decreasing the surface energy. Increasing temperature leads to the change in the adsorption isotherm from Langmuir type (L-type) to "double plateau" type (LS-type). Quantum chemistry study shows that the adsorbed layer of OSSF can reduce the adhesive force of CH4 and H2O on the pore surface of cores. The OSSF can also decease the initial foaming volume and stability in induction period and accelerating period of sodium dodecyl benzene sulfonate (SdBS). It is found that the surface tension of OSSF increases with aging temperature but decreases with the adding of inorganic *** OSSF has positive effect on wettability reversal to water-wet reservoir by adsorption on solid-liquid interface. The results indicate OSSF adsorption layer can change surface chemical composition and exhibit lower interface energy than that of the cores. The presence of NaCl can decrease foaming volume and improve foam stability of OSSF. At the same time, OSSF can decease the initial foaming volume and stability in induct

关键词： Surface tension

drum brake noise reduction

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International Journal of Vehicle Noise and Vibration 2020年第1-2期16卷 58-68页

作者： Magdum, Sushant Parisa Kumbhar, Samir B. Mangaraju, Karanam Venkata Venkatesh, G. K.E. Societies Rajarambapu Institute of Technology Sakharale Dist. Sangali Maharashtra415414 India Faculty of Mechanical Engineering K.E. Societies Rajarambapu Institute of Technology Sakharale Maharashtra415414 India R&D Chassis Section Head TVS Motor Company Ltd. Hosur Tamilnadu635109 India R&D Brakes Lab Head TVS Motor Company Ltd. Hosur Tamilnadu635109 India

The reduction in drum brake squeal noise which greatly affects rider comfort as well as surrounding noise level has become a more challenging and trending problem in two-wheeler industries. In this paper, squeal noise is reduced by means of liner modification with different width and depth of the liner slot. Effect of change in liner geometry on squeal noise reduction is studied analytically and verified experimentally. A full nonlinear perturbed modal analysis is used to find the stability of the system. In order to validate the analytical results, experimental tests are carried at a certain slow speed having low brake pedal force. The experimental results show that the drum brake squeal noise is found to be reduced by a significant amount by applying the proposed method. It is found that significant modification in geometry of liner in view of noise reduction is not affecting much the vehicle performance. © 2020 Inderscience Enterprises Ltd.

关键词： Modal analysis

research on Weight-on-bit Self-adjusting dual-diameter PdC Bit design and Effect Evaluation Utilizing Stress-releasing Effect of rock at Bottomhole

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Arabian Journal for Science and engineering 2021年第7期46卷 6925-6937页

作者： Hu, Huaigang Guan, Zhichuan Wang, Bin Lu, Baoping Chen, Weiqing Xu, Yuqiang Liu, Yongwang CNPC Engineering Technology R&D Company Limited Beijing China China University of Petroleum (East China) Qingdao China Shandong Ultra-Deep Drilling Process Control Tech R&D Center Qingdao China Qingdao Refining and Chemical Co. LTD Qingdao China Sinopec Research Institute of Petroleum Engineering Beijing China King Fahd University of Petroleum and Minerals (KFUPM) Dhahran Saudi Arabia

rock-breaking efficiency is not so satisfied using the conventional PdC bit, especially in the hard, soft–hard interbedded, and strong abrasive formations in ultra-deep wells. A method is proposed to make full use of stress-releasing effect at bottomhole, thereby improving the rock-breaking efficiency, and a supporting weight-on-bit (WOB) self-adjusting dual-diameter PdC bit (WSdB) has been invented. The WSdB can dynamically adjust the depth-of-cut control characteristics, which could improve the rate of penetration (rOP) while mitigating the stick–slip vibration caused by the rapid change of depth of cut. The stress field of the rock at the bottomhole is calculated with a numerical method, and the working mechanism of the bit is analyzed. The application effect of the WSdB is evaluated through laboratory tests preliminarily. The results show that the stress concentration area on the shoulder of the reaming bit is decreased obviously and a larger stress unloading area emerges in the intersection between reaming and pilot bit. Thus, mechanical specific energy (MSE) can be greatly reduced when the reaming bit drills into this section. Indoor tests show that the maximum rOP of WSdB can be reached up to 70% higher compared to the conventional PdC bit, and higher rOP could be obtained with a relatively lower bit torque. With drilling parameters greater than the critical revolution and WOB, the reduction in MSE can be reached up to 36% during the rock-breaking process. Making further efforts into the optimization of bit structure to reduce the vibration intensity is expected to achieve more improved bit performance.

关键词：

Integrated loss control and prevention technologies for complex deep wells based on precise MPd

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Integrated loss control and prevention technologies for comp...

SPE Oil and Gas India Conference and Exhibition 2019, OGIC 2019

作者： Wang, Gang Fan, Honghai Zhang, Wei Yang, Yang Han, Zili Wu, Hongxuan Li, Wanjun Li, Jiaying Zhou, Tuo Zhou, Haiqiu Liu, Jitong China University of Petroleum-Beijing CNPC Engineering Technology R and D Company Limited China China University of Petroleum-Beijing China CNPC Engineering Technology R and D Company Limited China CNPC Bohai Drilling Engineering Company Ltd China CNPC Chuanqing Drilling Engineering Company Ltd China

ISBN: (纸本)9781613996447

M15 well contains complex intervals, where anticlinal structures developed from faults make long mudstone barriers full of cracks, which makes it hard to predict pore pressure. Loss is one of the most serious problems during drilling and cementing, while blow out accidents happen sometimes. Previous casing programs hardly adjust to all complex intervals and conventional LCMs (loss control materials) play few roles. As a result, designated targets used to be rarely reached. It is proved that low pressure intervals shall be isolated firmly and complex intervals as well as reservoirs should be developed in independent intervals, thus casing programs have been modified. 188 lab tests were finalized, including 180°C hot rolling, anti-contamination test, lubricity test and inhibition experiments, in order to develop a kind of organic salt mud system that has premium inhibition, plugging, lubricating, heat & salt resistance properties. Precise MPd (managed pressure drilling) techniques are recommended to achieve near-balance drilling operation, solving borehole instability problems to some extent. In the second interval the organic salt mud system is applied, while logging and casing running may be accomplished in one time. Besides, strings can be tripped out smoothly and high pressure brine productive zones are drilled safely. φ339.7mm casing joints are set at the depth of 3848m in the second interval and φ244.5mm casing joints are set at the depth of 5177m in the third interval, in order that deeper complex formation may be developed in a separate casing interval in which precise MPd is applied with LCMs while drilling and compound plugging agents. Therefore, downhole pressure is precisely controlled and large cracks are plugged statically on 28 occasions. designated targets have been all reached and 20 oil & gas productive layers have been developed. downhole complexities arising from loss and blowout have been solved in M15, where φ339.7mm casing was set at the deepest

关键词： Hot rolling

Pore-Scale Understandings for Steady-State Two-Phase Flow in Natural Porous Media from Pore Connectivity Quantification

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SSrN 2023年

作者： Qiao, Juncheng Zeng, Jianhui An, Ting Jiang, Shu Ma, Yong Liu, Yazhou Chen, dongxia Cai, Jianchao Zhang, Yongchao Feng, Xiao Cao, Zhe Sun, Chenhao State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Beijing102249 China College of Geosciences China University of Petroleum Beijing102249 China Fengcheng Oilfield operation District Xinjiang Oilfield Company CNPC Karamay834000 China Energy & Geosciences Institute Department of Chemical Engineering University of Utah UT84108 United States Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education School of Earth Resources China University of Geosciences Wuhan430074 China The Key Laboratory of Gas Hydrate Ministry of Natural Resources Institute of Marine Geology Qingdao266071 China CNPC Engineering Technology R&D Company Limited Beijing102206 China Sinopec Petroleum Exploration and Production Research Institute Beijing102206 China

Fluid and chemical transport in the connected pore system of various natural porous sandstone governs numerous energetic and industrial activities. A nanometer-millimeter pore connectivity quantification is compiled,on the basis of which steady-state two-phase flow physics are explored. Connectivity evaluation indicates that high permeable sandstone shares a reticular connection network with scale-invariant connected ratio stays at around 0.60, low-permeability sandstone exhibits branch-like pattern with the ratio ranging from 0.53 to 0.60, while tight sandstone is characterized by local chain-like pattern with an average ratio of 0.31. With decreasing connectivity degree, differed deviated linear and power-law flows present in the fractional non-wetting phase flow of steady-state two-phase flow. A coupled phase’s mobility, dynamic phase’s interactions, and dynamic non-wetting phase flow paths evaluations based on the connectivity quantification, incorporating dLVO theory, augmented Young-Laplace equation, and effective hydraulic radius model, explain the reasons for flow regime distinctions. It indicates that the full-range connected pore size distribution determines multiphase mobility potential and dynamic multiphase interaction force, which successively control the dynamic expansion of non-wetting phase pathway. differences in preferential non-wetting phase flow path expansions and accompanying non-wetting phase flow resistances in the connected pores © 2023, The Authors. All rights reserved.

关键词： Two phase flow

Investigation of the Effects of Various Operating and design Parameters of a Biodiesel-Fueled Pcci Combustion Engine by Kiva-Chemkin Coupling

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SSrN 2023年

作者： Zehni, Alborz Khoshbakhti Saray, rahim Poorghasemi, Kamran Mousavi, Seyed Mohammad Mashhadi, Khashayar Imani, Amin Engineering Department Krengel Manufacturing ClevelandOH United States Department of Mechanical Engineering Sahand University of Technology Sahand New Town Tabriz Iran Department of Mechanical Engineering Islamic Azad University Shabestar Branch Shabestar Iran Department of Mechanical Engineering University of Manitoba WinnipegMBR3T 5V6 Canada R&D Department of Mega Motor Company Engine Division Iran Malek-Ashtar University of Technology Iran Sharif University of Technology Iran

In the current work, a parametric investigation is conducted by KIVA-CHEMKIN code to evaluate the impacts of the temperature and pressure of intake charge, injection timing and pressure, and EGr rate parameters on the combustion and emission characteristics of neat biodiesel (B100) within a PCCI engine. In this simulation, multi-chemical surrogate mechanism using methyl decanoate (Md) and methyl-9-decenoate (Md9d) is utilized for the biodiesel reaction mechanism. The analyses are conducted under conditions of 2000 rpm engine speed and 5.5 bar indicated mean effective pressure (IMEP). The numerical results show that higher EGr rate retards the first and second peaks of heat release rate. Also, increasing intake temperature decrease the first peak, and increase the second peak of heat release rate. Increasing the injection pressure does not always lead to improved combustion. The phasing of the peak of low temperature heat release is shifted with the timing of the injection event, but, this sensitivity is lower for the peak of high temperature heat release. Each design parameter has its own influence on exhaust emissions. For different various operating and design parameters, range of combustion efficiency varies between 48% and 51.84%. The presented numerical 2-d and 3-d results of this investigation can be construed to offer an in-depth insight into the qualities of the biodiesel PCCI combustion. © 2023, The Authors. All rights reserved.

关键词： Biodiesel

Microscopic Molecular and Experimental Insights into Multi-Stage Inhibition Mechanisms of Alkylated Hydrate Inhibitor

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SSrN 2022年

作者： Liao, Bo Wang, Jintang Li, Mei-Chun Lv, Kaihe Wang, Qi Li, Jian Huang, Xianbing Wang, ren Lv, Xindi Chen, Zhangxin Sun, Jinsheng Shandong Qingdao266580 China Department of Chemical & Petroleum Engineering University of Calgary ABT2N 1N4 Canada CNPC Engineering Technology R&D Company Limited Beijing102206 China Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and Engineering Nanjing Forestry University Nanjing210000 China Shandong Qingdao266580 China

The development of high-performance gas hydrate inhibitors for drilling fluids is of great significance for developing natural gas hydrates safely and efficiently. To improve the gas hydrate inhibition performance of a conventional gas inhibitor poly (vinyl pyrrolidone) (PVP), a random copolymer (SYZ-1) of N-vinyl pyrrolidone (NVP) and N, N-dimethyl acrylamide (dMAA) was synthesized, imparting abundant alkylated groups on the backbone of PVP. The results of experiments and molecular simulations illustrate that the mechanism of the inhibitors varies at different stages. The inhibitors retard hydrate formation by reducing the solubility of methane molecules in water during the nucleation phase. However, during the formation phase, the hydrate inhibition is achieved by adsorption. In particular, the absorption of PVP on the surface of hydrate can be effectively improved by alkylation, and the interaction energy of SYZ-1 with the hydrate nucleus was increased by 3.22 times compared to PVP. A molecular model for evaluating the interaction of inhibitors with hydrates is also successfully developed, which corresponds well to the experimental results. These results contribute to a better understanding of hydrate formation in drilling fluids and implications for developing new materials for high-performance hydrate drilling fluids. © 2022, The Authors. All rights reserved.

关键词： Alkylation

150 GHz-Band Compact Phased-Array AiP Module for Xr Applications Toward 6G

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IEEE Microwave and Wireless technology Letters 2025年第6期35卷 920-923页

作者： Morishita, Yohei Takahashi, Ken Hasaba, ryosuke Egami, Akihiro Abe, Tomoki Suzuki, Masatoshi Murata, Tomohiro Nakagawa, Yoichi Yamazaki, Yudai Park, Sunghwan Uchino, Takaya Liu, Chenxin Sakamaki, Jun Tomura, Takashi Sakai, Hiroyuki Taneda, Hiroshi Murayama, Kei Nakabayashi, Yoko Hara, Shinsuke Watanabe, Issei Kasamatsu, Akifumi Okada, Kenichi Takinami, Koji Panasonic Industry Co. Ltd. Engineering Division Tokyo 105-5523 Japan Panasonic System Networks R&D Lab. Co. Ltd. Kanazawa 920-0024 Japan Institute of Science Tokyo Tokyo 152-8552 Japan Shinko Electric Industries Company Ltd. Nagano 381-2287 Japan National Institute of Information and Communications Technology Tokyo 184-8795 Japan

To realize the practical application of sub-THz band wireless communication toward 6G, it is necessary to develop AiP modules with compact size and low cost. This letter discusses the design of a miniaturized AiP module for high-speed wireless communication targeting extended reality (Xr) applications in medical operating rooms as an example of 6G use cases. By integrating waveguide antenna array along with a compact divider/combiner within the multilayer substrates, the module achieves a small form factor of 8.42 × 20.0 × 1.37 mm while integrating radio frequency integrated circuit (rFIC) and peripheral surface mount components. The measurement shows a data rate of 40 Gb/s at a 3 m distance in the 150 GHz band with an excellent transmission energy efficiency of 35.7 pJ/bit. © 2023 IEEE.

关键词： 6G antenna bump CMOS d-band divider/combiner module phased array sub-THz