检索结果-内蒙古大学图书馆

ArMA-CUPB Geothermal International Conference 2019

作者： Shentu, Junjie Lin, Botao dong, Jingnan Yu, Huiyong Shi, Shanzhi Ma, Junxiu State Key Laboratory of Petroleum Resources and Prospecting and College of Petroleum Engineering China University of Petroleum Beijing102249 China CNPC Engineering Technology R&D Company Limited Beijing China PetrolChina Xinjiang Oilfield Company Engineering Technology Research Institute Karamay834000 China

Hydraulic fracturing has been widely used in the development of conglomerate reservoirs in the Karamay oilfield Xinjiang, China. Understanding the influences of large and irregular conglomerate particles on the fracture propagation behavior is crucial for the fracturing design of reservoirs of this type. This study numerically captured the associated fracturing process and thoroughly analyzed the impact of conglomerate particles by adopting the discrete element method. The simulation results indicated that the existence of conglomerate particles conspicuously increase the breakdown pressure of the conglomerate formations. Several scenarios were designed to investigate the influence of content and strength of conglomerate particles, respectively. It was found the fitting relationship was nonlinear between breakdown pressure and particle content and was linear between breakdown pressure and particle strength. Conglomerate particles affected fracture behavior in two patterns, namely penetration and circumvention. However, under certain in-situ stress condition, the conglomerate particles had negligible impact on the principal direction of fracture propagation. The simulation results are advantageous to instruct the field fracturing operations, such as the selection of hydraulic fracturing site and injection parameters. Copyright © ArMA-CUPB Geothermal International Conference *** rights reserved.

关键词： Fracture

来源：评论

学校读者我要写书评

暂无评论

Simulation of thermomechanical process in rock under high-voltage pulses

引用

Physica Scripta 2025年第6期100卷 065609-065609页

作者： Zhao, Yong Liu, Yi Liao, Hongbin Cheng, Jin Lin, Fuchang Liu, Siwei School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology) Hubei Province Wuhan 430074 China Key Laboratory of Pulsed Power Technology Huazhong University of Science and Technology) Ministry of Education Hubei Province Wuhan 430074 China CNPC Engineering Technology R&D Company Limited Beijing 065001 China Institute of Fluid Science Tohoku University 2-1-1 Katahira Aoba-ku Miyagi Prefecture Sendai 980-8577 Japan

rock fragmentation by high-voltage pulsed discharge (rHPd) has gained significant attention in various engineering fields, yet the mechanism of rock fracture induced by the instantaneous high temperature of plasma remains insufficiently quantified. This study establishes a numerical model of thermomechanical damage in rocks under rHPd conditions, analyzes the time evolution of plasma temperature at different fragmentation distances, and proposes a method for calculating the time response of plasma temperature. Based on the discrete element model (dEM), the study simulates the thermal diffusion and thermally induced fracture process inside the rock under the instantaneous high temperature of plasma, revealing the multi-field coupling fracture mechanism induced by high-voltage pulses. The results indicate that plasma-induced high temperatures cause localized mineral particles inside the rock to heat up. However, due to the inherent physical properties of the rock, the range and magnitude of temperature changes remain limited. The bonding between minerals, the presence of voids, and the rock’s low thermal expansion coefficient, low thermal conductivity, and high specific heat capacity collectively result in low heat transfer efficiency, making the effect of transient thermal loading on rock fracture negligible. Even under extreme thermal loading conditions (80000 K, 100 μs), although the range of temperature change increases and a small number of fractures are generated, the contribution of thermomechanical damage remains much smaller than that of shockwave-induced fracturing. The findings of this study enhance the understanding of thermomechanical coupling mechanisms in rHPd and provide a reference for the development of multi-phase medium coupling models. © 2025 IOP Publishing Ltd. All rights, including for text and data mining, AI training, and similar technologies, are reserved.

关键词： high-voltage pulses particle flow code plasma rock fragmentation thermomechanical process

来源：评论

学校读者我要写书评

暂无评论

Challenge of temperature control for downhole instruments in HTHP reservoir

Challenge of temperature control for downhole instruments in...

引用

SPE Offshore Europe Conference and Exhibition 2019, OE 2019

作者： Gao, Wenkai Liu, Ke Jia, Hengtian Hong, difeng Teng, Xinmiao CNPC Engineering Technology R and D Company Limited

ISBN: (纸本)9781613996645

With the further exploration of oil and gas, we have to search for new resources which buried in deep strata, and most of the deep and ultra-deep wells are categorized in high-pressure/high-temperature (HPHT) wells. The problem of high temperature and the challenge to the existing downhole equipments are becoming increasingly prominent, where the drilling depth is severely restricted. The conventional measurement while drilling tools with common electronics will experience very high failure rates at these conditions. One of the solutions is called the active cooling technology, which can transfer the heat from electronics system to downhole environment. By this way, the temperature control of downhole instrument circuit system is realized. The active cooling technology is expounded in this paper, expecially about the principles and development status of each system. After evaluating and analyzing the characteristics of this technology, the function of heat transfer and constituent elements for the cooling system are summarized. The study from this work demonstrates the future work for downhole cooling technology: large refrigeration capacity, small size, strong adaptability and modularization. Copyright 2019, Society of Petroleum Engineers

关键词： Instrument circuits

来源：评论

学校读者我要写书评

暂无评论

deformation dynamics of Bubbles in Asymmetric Semicircle Porethroat Microchannels: Experimental and Theoretical Insights

SSRN

引用

SSrN 2023年

作者： Yang, Yuqi Wang, Zizhen Wan, Guangze Liu, Zhengxiao Zhang, Haipeng Fu, Yuequn Ariane, Essouma E.F.B. Liu, Jian Xing, Tingyan Zhang, Shiling China University of Petroleum–Beijing at Karamay Karamay834000 China Institute of Unconventional Oil and Gas Science and Technology China University of Petroleum Beijing102249 China School of Information Engineering China University of Geosciences Beijing100083 China CNPC Engineering and Technology R&D Company Limited Beijing Beijing102200 China PoreLab The Njord Centre Department of Physics University of Oslo Oslo0371 Norway State Key Laboratory of Heavy Oil Processing China

Multi-phase microfluidic transport is a topic of great interest in both academic research and industry. This study focuses on the deformation dynamics of bubbles generated during oil transport in microchannels. We investigate the deformation behavior of bubbles in square microchannels with two semi-cylinders. Our findings show that bubble deformation occurs in two modes: breakup deformation and elastic nonbreakup deformation. By evaluating the minimum width of the microchannel neck, we divide both modes into four stages, which exhibit power-law variation. Additionally, we investigate the effects of presetting factors on viscosity in the microchannel. To gain deeper insights into the deformation mechanism of bubbles, we use micro-PIV to describe the velocity patterns and dimensional distribution of viscosity in the flow. We successfully summarize a dynamical scaling law that specifies the size of bubbles formed in the pore throat microchannels. It reveals that the fluid characteristic of the continuous phase dominates the deformation of bubbles in such microdevices. Moreover, we developed the rosin-rammler regression models to predict droplet size and neck width formation in the continuous liquid at microchannels, which we compare with experimental data. results of the analytical model show that microchannel shape and droplet volume play important roles in the droplet deformation process. © 2023, The Authors. All rights reserved.

关键词： Microchannels

来源：评论

学校读者我要写书评

暂无评论

Experimental study on the creep behavior of shale in uniaxial compression test 54

Experimental study on the creep behavior of shale in uniaxia...

引用

54th U.S. rock Mechanics/Geomechanics Symposium

作者： Gao, dewei Yang, Henglin dong, Jingnan Chen, Mian Hou, Yanan Li, Jun Sichuan Changning Natural Gas Development Co. LTD Chengdu China CNPC Engineering Technology R&D Company Limited Beijing China Beijing China China University of Petroleum-Beijing Beijing China

In oil and gas well engineering, shale creep plays an important role in both the borehole stability and the crack closure of the after-fracturing process. In this study, the creep behavior of matrix shale in uniaxial compression test is experimentally examined. Both uniaxial compression tests and uniaxial compression creep tests are conducted on small-scale specimens using Gatan micro-testing system. Several constant-load stages are carried out before the stress raise above the threshold. The results show that the matrix shale have a creep threshold, below which the specimens exhibit distinct primary creep stage and secondary creep stage. Above the threshold, the specimen is in accelerated stage, in which the creep strain increased in an exponential manner. results also show that the specimens of regular uniaxial compression strength tests conducted within several minutes exhibited one main crack, which dominated the failure pattern. The specimens of creep tests that are conducted over tens of hours are crushed into lots of fine parts. The development of micro cracks dominates in the creep tests. The comparison between uniaxial compressive strength and creep threshold value show that the threshold value may be higher than the UCS value if the specimen is in constant-load mode for tens of hours. The results are limited to USC tests because the propagations of the microcracks might be hindered in triaxial tests. This study provides evidence of the subcritical propagation and blunting of the micro cracks in creep test. The results also provide better understanding of the creep shale behavior under uniaxial compression. It may help researchers know more about the creep behavior of well borehole and the crack closure of shale. © 2020 ArMA, American rock Mechanics Association

关键词： Creep

来源：评论

学校读者我要写书评

暂无评论

Triple-Cladding Ytterbium doped Fiber for 12 kW Single Module

Triple-Cladding Ytterbium Doped Fiber for 12 kW Single Modul...

引用

Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Yue Meng Zuying Xu Xudong Shi Yu Li Tianying Liu Can Li Xiao Yan Wei Zheng Heng Wang Jiangang Yu Zhiyong Zhao Ming Tang Optical fiber R&D center Everfoton Technologies Corp oration Limited State Key Laboratory of Optic al Fiber and Cable Manufactu re Technology Yangtze Optical Fibre and Cable Joint Stock Limited Company Wuhan 4 China Optical fiber R&D center Everfoton Technologies Corp oration Limited Wuhan China Wuhan National Lab for Optoelectronics (WNLO) & National Engineering Laboratory for Next Generation Internet Access System School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan China

High power continuous-wave ytterbium-doped fiber lasers have unique advantages such as high electro-optical efficiency, excellent beam quality and good thermal management, and are widely used in industrial materials processing and scientific research. However, multi-kW $(\geqslant$ 10kW) high-power fiber lasers has encountered numerous technology challenges in double-cladding fibers. In this work, we designed and fabricated a triple-cladding ytterbium doped fiber with large core diameter by using Modified Chemical Vapor deposition (MCVd) combined with all-gas-phase doping method. An excellent laser performance could be demonstrated for such a fiber with an output power of more than 10 kW and a slope efficiency of 82%, no Transverse Mode instability (TMI) is observed. Long-term laser stability at 12 kW-level was carried out in a master oscillator power amplifier (MOPA) laser system for 500 hours with power degradation less than 1%, meanwhile a stimulated raman scattering (SrS) suppression ratio that is larger than 45dB was obtained.

关键词：

来源：评论

学校读者我要写书评

暂无评论

research of drilling and completion technologies for heavy oil in venezuela and offshore presalt hydrocarbons in Brazil

Research of drilling and completion technologies for heavy o...

引用

SPE Middle East Oil and Gas Show and Conference 2019, MEOS 2019

作者： Fu, Jin Wang, Xi Zhang, Shunyuan Chen, Chen CNPC Engineering Technology R&D Company Ltd

Located in south of Eastern Venezuela Basin, Orinoco Oilfield is an onshore heavy oil field in South America. The heavy oil is known for its high content of acids, heavy metals and asphaltenes with a viscosity of 1000-10000mPa·s. According to the reserve report released by PdVSA by the end of 2016, JUNIN Block that is situated in east of Orinoco Oilfield has an OOIP of 178*108bbl. data of drilled wells and distances between offset horizontal intervals in Orinoco were both studied to improve ultimate production rates. 3-dimension borehole trajectories were designed and the most effective anti-collision measures were taken. After optimziation 8-12 horizontal wells are distributed on one pad. As the horizontal interval extends, the stable production time is prolonged and the accumulative production per well improves. However, the recovery rate stops increasing when the horizontal interval is over 1600m in JUNIN Block. Economically a large space between offset horizontal intervals results in fewer wells and lower costs, but a smaller space contributes to a higher production efficiency per well. If the space exceeds 600m, the accumulative production rate increases much more slightly. A three-dimension well trajectory consists of a vertical interval, an angle building interval, an angle holding interval, an angle building & direction changing interval, a direction turning interval as well as an absolute horizontal interval. Since Petrobras developed the first ever offshore deep reservoir (Lula) by scale in 2006, Brazil has been conducting a progressive campaign targeting hydrocarbons buried under deep water, which contributes to discovery of Lula, Carioca, Jupiter, Buzios, Libra and other giant presalt reservoirs in Santos Basin after Campos Basin, where there are 9 oil fields ranking among the top 20 offshore oil fields in terms of OOIP. By June 2017 over 160×104bbl oil and gas were produced per day in deep water of Santos Basin, taking up 57.1% of the total yield of Cam

关键词： Offshore oil well production

来源：评论

学校读者我要写书评

暂无评论

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

Experimental study on the synthesis and interfacial properti...

引用

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

来源：评论

学校读者我要写书评

暂无评论

A three dimensional visualized physical simulation for natural gas charging in the micro-nano pore system

引用

Petroleum Exploration and development 2022年第2期49卷 349-362页

作者： QIAO Juncheng ZENG Jianhui XIA Yuxuan CAI Jianchao CHEN dongxia JIANG Shu HAN Guomeng CAO Zhe FENG Xiao FENG Sen- State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249.China College of Geosciences China University of PetroleumBeijing 102249China Institute of Geophysics and Geomatics China University of GeosciencesWuhan 430074China Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education China University of GeosciencesWuhan 430074China Dagang Oilfield Company PetroChinaTianjin 300280China Sinopec Petroleum Exploration and Production Research Institute Beijing 102206China CNPC Engineering Technology R&D Company Limited Beijing 102206China

A micro-nano pore three-dimensional visualized real-time physical simulation of natural gas charging, in-situ pore-scale computation, pore network modelling, and apparent permeability evaluation theory were used to investigate laws of gas and water flow and their distribution, and controlling factors during the gas charging process in low-permeability(tight) sandstone reservoir. By describing features of gas-water flow and distribution and their variations in the micro-nano pore system, it is found that the gas charging in the low permeability(tight) sandstone can be divided into two stages, expansion stage and stable stage. In the expansion stage, the gas flows continuously first into large-sized pores then small-sized pores, and first into centers of the pores then edges of pores;pore-throats greater than 20 μm in radius make up the major pathway for gas charging. With the increase of charging pressure, movable water in the edges of large-sized pores and in the centers of small pores is displaced out successively. Pore-throats of 20-50 μm in radius and pore-throats less than 20 μm in radius dominate the expansion of gas charging channels at different stages of charging in turn, leading to reductions in pore-throat radius, throat length and coordination number of the pathway, which is the main increase stage of gas permeability and gas saturation. Among which, pore-throats 30-50 μm in radius control the increase pattern of gas saturation. In the stable stage, gas charging pathways have expanded to the maximum, so the pathways keep stable in pore-throat radius, throat length, and coordination number, and irreducible water remains in the pore system, the gas phase is in concentrated clusters, while the water phase is in the form of dispersed thin film, and the gas saturation and gas permeability tend stable. Connected pore-throats less than 20 μm in radius control the expansion limit of the charging pathways, the formation of stable gas-water distribution, and the ma

关键词： low permeability(tight)sandstone gas charging three-dimensional visualization physical simulation micro-nanometer pore network gas and water flow and distribution

来源：评论

学校读者我要写书评

暂无评论

Optimizing Parameters of Two-Stage Pdc Bit in deep Formation Applications

SSRN

引用

SSrN 2023年

作者： Chen, Zhenliang Shi, Huaizhong Zhao, Heqian Huang, Zhongwei He, Wenhao Chen, Han Yu, Chao Zhang, Bo State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum-Beijing Beijing102249 China CNPC Engineering Technology R&D Company Limited Beijing Petroleum Machinery Co. Ltd Beijing102206 China Beijing Key Laboratory of Optical Detection Technology for Oil and Gas China University of Petroleum-Beijing Beijing102249 China Department of Civil and Environmental Engineering University of Alberta EdmontonABT6G 2G7 Canada

Two-stage PdC (Polycrystalline diamond compact) bit is a special drilling bit consisting of a small-diameter pilot and a large-diameter reamer. The unique rock-breaking structure is designed to improve the drilling efficiency and reduce drilling costs in deep and abrasive formations. According to previous studies, the hydraulic structure of the two-stage PdC bit can significantly affect the drilling performance of removing cuttings near the bottom of the wellbore. Therefore, this research has proposed to achieve a high efficiency of cuttings removal by optimizing the hydraulic structure. In this paper, the flow field at the bottom of the well near the two-stage PdC bit (Φ171.45 mm pilot + Φ215.9 mm reamer) has been numerically studied using the finite element method. As shown in the analysis results, both the flow rate of the pilot and the flow rate ratio of the pilot to the reamer increase significantly with the increase of the area ratio of the pilot nozzles to the total nozzles. The numerical data supports that the cuttings can be removed effectively from the bottom of the wellbore when the area ratio is between 0.75 and 0.80. Moreover, the cuttings can be removed effectively from the bottom of the wellbore when the mud viscosity is about 10 mPa·s, the rate of penetration is between 4 and 8 m/h, the drill speed is 90rpm and the cuttings particle sizes is between 1 and 2 mm. Besides, increasing the pump rate can imporve the cutting-carrying efficiency through the wellbore bottom. Field test results indicate that the average penetration rate of the test interval is increased by 30% and the footage of the test interval is increased by over 40% compared to the adjacent interval of the same well. This study can provide guidance for the optimal design of the hydraulic structure of such two-stage PdC bits. © 2023, The Authors. All rights reserved.

关键词： reamers

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：