Because of high cost and pollution oil-based drilling fluid, the water-based fluid is increasingly used now. However, bedding planes micro-cracks are rich in shale formation. When contacts formation rock, it causes propagation crack invasion which decrease strength cause wellbore instability. In this paper, we analyzed influence on failure mode by mechanics experiment. Based those experimental results, considering effect plane time, established modeling stability for The result from model...

Hydraulic fracturing, which forms complex fracture networks, is a common technique for efficiently exploiting low-permeability conglomerate reservoirs. However, the presence of gravel makes highly heterogeneous, endowing deformation, failure, and internal micro-scale expansion mechanisms with uniqueness. The mechanism when encountering in reservoirs remains unclear, challenging design effective implementation hydraulic fracturing. This paper utilizes Abaqus platform adopts maximum...

Abstract The residential air conditioning load has the characteristics of dispersed distribution and state diversity, so it is great significance to study cluster resource management optimization single usage mode. This paper uses non-negative matrix decomposition hypergraph networks improve clustering accuracy adaptive adjustment, decentralized control grouping wheel stops are realized according tunable potential. Simulation analysis verifies model’s strategy’s effectiveness.

Abstract The pore structure of carbonate rocks is both complex and highly heterogeneous. Accurately assessing acoustic anisotropy crucial for analysing predicting the properties reservoirs. Numerous experimental studies have investigated rocks, various fracture detection techniques been developed. However, these not adequately addressed impact nonuniform distribution rock structures on anisotropy. computed tomography scanning images core can be obtained by using digital image processing...

Baseline drift occurs in various measured spectra, and the existence of a baseline signal will influence qualitative quantitative analyses. Therefore, it is necessary to perform correction or background elimination before spectral analysis. In this paper, multiple constrained asymmetric least squares method based on penalized principle proposed for correction. The takes both peak characteristics into account. Based prior knowledge that left right boundaries characteristic peaks should be...

Abstract Clay shale is frequently encountered in drilling. With strong hydration capacity, when clay contacts with drilling fluid, rock structural and mechanical property will be affected, causing wellbore instability. Acoustic frequency spectrum a significant parameter geophysical logging. The influence of on can reflected acoustic Therefore, order to identify damage have precise evaluation for damage, novel index has been built the basis spectrum. Meanwhile, considering hydration, hydrated...

A novel water-soluble copolymer was prepared from acrylamide (AM), acrylic acid (AA), mono-2-O-(allyloxy-2-hydroxyl-propyl)-β-cyclodextrin (O-β-CD) and allyl alcohol polyoxyethylene ether (APEG), which characterized with infrared spectroscopy, proton nuclear magnetic resonance 13C-nuclear spectrometry static light scattering. This new combining polyglycols the massive hydroxyl groups cavity structure of β-CD investigated for inhibiting shale hydration. Based on salt-tolerance test,...

Wellbore collapse frequently happens in clay shale formation due to its strong hydration. Numerous studies on hydration have been conducted find an effective method evaluate and control damage so that wellbore instability can be reduced. It is well-known cause dramatic changes structure, leading the modification of acoustic properties. Acoustic property a common geophysical parameter widely used petroleum engineering. Therefore, this paper, considering time-frequency domain characteristics...

Abstract The horizontal well‐staged fracturing technology has been widely used in many oilfields to enhance well production by creating fracture network. Accurate prediction of initiation is significant for successful hydraulic operation. However, fractured reservoir highly tricky due its rich natural fractures and artificial previously created during staged fracturing. These are thought be major factors conducting efficient reservoir. Therefore, this paper, induced stress from analyzed...

In view of the flight characteristics cruise missiles, a new path planning area map, slant distance is proposed on premise that missiles move at constant speed certain altitude. The diagram compared with one without improvement. Particle swarm optimization (pso) used to build mathematical model for intelligent and simulation multiple missiles. results show graph particle can solve problem

Flue gas from periodic furnaces with large temperature fluctuation is difficult to be recovered by regular heat exchangers. To recover that unstable waste heat, a pre-rectifier (TPR) honeycombed structure developed smooth down the continuous storing and releasing. A three-dimensional model of TPR constructed analyze transfer process. Temperature rectification rate η defined quantify smoothing-down effect on fluctuation. The relative size <i>s</i>* as ratio hole inner wall...

Summary Buried hills are basement uplifts beneath sediment layers that possess significant exploration potential. Using the Jianbei Slope of Qaidam Basin in China as a case study, we systematically investigated types and origins fractures deep buried-hill gas reservoirs. In our synthesized various data, including experimental results, production dynamics, both conventional special logging with aim clarifying sequence effectiveness fracture formation these reservoirs; analyzing impact...

Zhang, W. P. (2010): Illustrating Translation Studies (in Chinese), Xi’an, World Publishing Corporation, 137 p.. Un article de la revue Meta (Volume 57, numéro 3, septembre 2012, p. 541-842) diffusée par plateforme Érudit.

In the preparation of a production batch,the tobacco block unpacked grade which represents only few percents cigarette blend has to be broken down weight in same proportion batch as blend.It's laborsome manual work causing considerable degradation and blending fluctuations.The process was improved by bringing together grades question make up sub-blend common several blends,and handled single element blended with other elements constitute complete blend.In process,97% were form...

To improve the evaluating ability of electrical contact properties materials, a test device with good comprehensive performance is designed based on eddy current repulsion mechanism. The working principle, mechanical structure and driving circuit are introduced. A prototype made tested. result shows that has wide range speed regulation, application scope small volume.