Results 81 to 90 of about 359,678 (168)
Mechanical Analysis and Experimental Study of Downhole Electrical Punching Tool
Shiyou jixieTubing blockage often occurs due to sand or wax deposition during oil and gas well production. This paper presents a new electro-hydraulic punching tool suitable for high-temperature and high-pressure downhole operations to achieve efficient well ...
Wang Wenming +6 more
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Laser-based transmission-reflection fusion device for coal-water mixture concentration measurement
Gong-kuang zidonghuaIn the measurement of coal-water mixture concentration during hydraulic punching permeability enhancement operations, traditional methods—such as the cofferdam method, sedimentation tank method, and weighing hopper method—suffer from low efficiency and ...
GUO Yu +9 more
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Evaluation of the vertical and horizontal hydraulic conductivities of household wastes [PDF]
, 2007 Hydraulic conductivity is a measurement of the ease of movement of a fluid through a medium and is therefore a key parameter in the design of landfill leachate management systems.
Hudson, Andrew Philip
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Gong-kuang zidonghuaTo address the problems of existing hydraulic intensifiers used in underground coal mines—such as large size, inability to achieve pressure boosting while drilling, and the need for auxiliary driving devices—a passive hydraulic intensifier for while ...
TIAN Hongjie
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Failure diagnosis in real time stochastic discrete event systems
Engineering Science and Technology, an International Journal, 2015 Discrete Event System (DES) has been used for Failure Detection and Diagnosis (FDD) of a wide range of systems. For real time systems, timed DES based frameworks diagnose failures leading to violation of delays or deadlines.
Chaitali Biswas Dutta, Utpal Biswas
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Numerical simulation analysis of effect of borehole gas extraction under fluid‐structure interaction
Energy Science & EngineeringTo study the effect of coal pressure on gas extraction under fluid‐solid coupling, the effect of gas extraction radius under different pore sizes and treatment methods was simulated by using COMSOL Multiphysics software, the time evolution law of gas ...
Lin Wang +3 more
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, 2020 Hydraulic Structures - Theory and Applications conveys a broad understanding of the fundamental mechanisms of various hydraulic structures. Emphasis is given to the analysis and design of different types of hydraulic structures.
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Punching Strength of R.C. Flat Slabs with Moment Transfer [PDF]
The paper presents results from an experimental and analytical study of interior columns subjected to punching in the presence of an unbalanced moment. The moment, characterized in the study by an eccentricity of the load in the column, is shown to have ...
Krueger, Gaston, Burdet, Olivier
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Meikuang AnquanFor the problems that poor gas permeability and strong gas adsorption in the coal seams of Wuhushan Coal Mine leads to poor drilling and extraction efficiency and low extraction rate, physical simulation and on-site testing methods were used to ...
Baoze GU
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New Tehniques of Pressure Relief and Permeability Enhancement by Abrasive Jet in Coal Mine Roadways
Shiyou jixie, 2023 Pure water jet penetration in hard coal seams is deficient for low rock-breaking efficiency and complex operation.This paper presents two new techniques of pressure relief and permeability enhancement by deep penetration with abrasive jet and by radial ...
Wang Bin +6 more
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